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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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C
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SPDX-License-Identifier: GPL-2.0-or-later/* * NET3 Protocol independent device support routines. * * Derived from the non IP parts of dev.c 1.0.19 * Authors: Ross Biro * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> * Mark Evans, <evansmp@uhura.aston.ac.uk> * * Additional Authors: * Florian la Roche <rzsfl@rz.uni-sb.de> * Alan Cox <gw4pts@gw4pts.ampr.org> * David Hinds <dahinds@users.sourceforge.net> * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> * Adam Sulmicki <adam@cfar.umd.edu> * Pekka Riikonen <priikone@poesidon.pspt.fi> * * Changes: * D.J. Barrow : Fixed bug where dev->refcnt gets set * to 2 if register_netdev gets called * before net_dev_init & also removed a * few lines of code in the process. * Alan Cox : device private ioctl copies fields back. * Alan Cox : Transmit queue code does relevant * stunts to keep the queue safe. * Alan Cox : Fixed double lock. * Alan Cox : Fixed promisc NULL pointer trap * ???????? : Support the full private ioctl range * Alan Cox : Moved ioctl permission check into * drivers * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI * Alan Cox : 100 backlog just doesn't cut it when * you start doing multicast video 8) * Alan Cox : Rewrote net_bh and list manager. * Alan Cox : Fix ETH_P_ALL echoback lengths. * Alan Cox : Took out transmit every packet pass * Saved a few bytes in the ioctl handler * Alan Cox : Network driver sets packet type before * calling netif_rx. Saves a function * call a packet. * Alan Cox : Hashed net_bh() * Richard Kooijman: Timestamp fixes. * Alan Cox : Wrong field in SIOCGIFDSTADDR * Alan Cox : Device lock protection. * Alan Cox : Fixed nasty side effect of device close * changes. * Rudi Cilibrasi : Pass the right thing to * set_mac_address() * Dave Miller : 32bit quantity for the device lock to * make it work out on a Sparc. * Bjorn Ekwall : Added KERNELD hack. * Alan Cox : Cleaned up the backlog initialise. * Craig Metz : SIOCGIFCONF fix if space for under * 1 device. * Thomas Bogendoerfer : Return ENODEV for dev_open, if there * is no device open function. * Andi Kleen : Fix error reporting for SIOCGIFCONF * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF * Cyrus Durgin : Cleaned for KMOD * Adam Sulmicki : Bug Fix : Network Device Unload * A network device unload needs to purge * the backlog queue. * Paul Rusty Russell : SIOCSIFNAME * Pekka Riikonen : Netdev boot-time settings code * Andrew Morton : Make unregister_netdevice wait * indefinitely on dev->refcnt * J Hadi Salim : - Backlog queue sampling * - netif_rx() feedback */
#include <linux/uaccess.h>#include <linux/bitmap.h>#include <linux/capability.h>#include <linux/cpu.h>#include <linux/types.h>#include <linux/kernel.h>#include <linux/hash.h>#include <linux/slab.h>#include <linux/sched.h>#include <linux/sched/isolation.h>#include <linux/sched/mm.h>#include <linux/smpboot.h>#include <linux/mutex.h>#include <linux/rwsem.h>#include <linux/string.h>#include <linux/mm.h>#include <linux/socket.h>#include <linux/sockios.h>#include <linux/errno.h>#include <linux/interrupt.h>#include <linux/if_ether.h>#include <linux/netdevice.h>#include <linux/etherdevice.h>#include <linux/ethtool.h>#include <linux/ethtool_netlink.h>#include <linux/skbuff.h>#include <linux/kthread.h>#include <linux/bpf.h>#include <linux/bpf_trace.h>#include <net/net_namespace.h>#include <net/sock.h>#include <net/busy_poll.h>#include <linux/rtnetlink.h>#include <linux/stat.h>#include <net/dsa.h>#include <net/dst.h>#include <net/dst_metadata.h>#include <net/gro.h>#include <net/netdev_queues.h>#include <net/pkt_sched.h>#include <net/pkt_cls.h>#include <net/checksum.h>#include <net/xfrm.h>#include <net/tcx.h>#include <linux/highmem.h>#include <linux/init.h>#include <linux/module.h>#include <linux/netpoll.h>#include <linux/rcupdate.h>#include <linux/delay.h>#include <net/iw_handler.h>#include <asm/current.h>#include <linux/audit.h>#include <linux/dmaengine.h>#include <linux/err.h>#include <linux/ctype.h>#include <linux/if_arp.h>#include <linux/if_vlan.h>#include <linux/ip.h>#include <net/ip.h>#include <net/mpls.h>#include <linux/ipv6.h>#include <linux/in.h>#include <linux/jhash.h>#include <linux/random.h>#include <trace/events/napi.h>#include <trace/events/net.h>#include <trace/events/skb.h>#include <trace/events/qdisc.h>#include <trace/events/xdp.h>#include <linux/inetdevice.h>#include <linux/cpu_rmap.h>#include <linux/static_key.h>#include <linux/hashtable.h>#include <linux/vmalloc.h>#include <linux/if_macvlan.h>#include <linux/errqueue.h>#include <linux/hrtimer.h>#include <linux/netfilter_netdev.h>#include <linux/crash_dump.h>#include <linux/sctp.h>#include <net/udp_tunnel.h>#include <linux/net_namespace.h>#include <linux/indirect_call_wrapper.h>#include <net/devlink.h>#include <linux/pm_runtime.h>#include <linux/prandom.h>#include <linux/once_lite.h>#include <net/netdev_lock.h>#include <net/netdev_rx_queue.h>#include <net/page_pool/types.h>#include <net/page_pool/helpers.h>#include <net/page_pool/memory_provider.h>#include <net/rps.h>#include <linux/phy_link_topology.h>
#include "dev.h"#include "devmem.h"#include "net-sysfs.h"
static DEFINE_SPINLOCK(ptype_lock);struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
static int netif_rx_internal(struct sk_buff *skb);static int call_netdevice_notifiers_extack(unsigned long val, struct net_device *dev, struct netlink_ext_ack *extack);
static DEFINE_MUTEX(ifalias_mutex);
/* protects napi_hash addition/deletion and napi_gen_id */static DEFINE_SPINLOCK(napi_hash_lock);
static unsigned int napi_gen_id = NR_CPUS;static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash, 8);
static inline void dev_base_seq_inc(struct net *net){ unsigned int val = net->dev_base_seq + 1;
WRITE_ONCE(net->dev_base_seq, val ?: 1);}
static inline struct hlist_head *dev_name_hash(struct net *net, const char *name){ unsigned int hash = full_name_hash(net, name, strnlen(name, IFNAMSIZ));
return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];}
static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex){ return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];}
#ifndef CONFIG_PREEMPT_RT
static DEFINE_STATIC_KEY_FALSE(use_backlog_threads_key);
static int __init setup_backlog_napi_threads(char *arg){ static_branch_enable(&use_backlog_threads_key); return 0;}early_param("thread_backlog_napi", setup_backlog_napi_threads);
static bool use_backlog_threads(void){ return static_branch_unlikely(&use_backlog_threads_key);}
#else
static bool use_backlog_threads(void){ return true;}
#endif
static inline void backlog_lock_irq_save(struct softnet_data *sd, unsigned long *flags){ if (IS_ENABLED(CONFIG_PREEMPT_RT)) { spin_lock_irqsave(&sd->input_pkt_queue.lock, *flags); } else { local_irq_save(*flags); if (IS_ENABLED(CONFIG_RPS) || use_backlog_threads()) spin_lock(&sd->input_pkt_queue.lock); }}
static inline void backlog_lock_irq_disable(struct softnet_data *sd){ if (IS_ENABLED(CONFIG_RPS) || use_backlog_threads()) spin_lock_irq(&sd->input_pkt_queue.lock); else local_irq_disable();}
static inline void backlog_unlock_irq_restore(struct softnet_data *sd, unsigned long flags){ if (IS_ENABLED(CONFIG_PREEMPT_RT)) { spin_unlock_irqrestore(&sd->input_pkt_queue.lock, flags); } else { if (IS_ENABLED(CONFIG_RPS) || use_backlog_threads()) spin_unlock(&sd->input_pkt_queue.lock); local_irq_restore(flags); }}
static inline void backlog_unlock_irq_enable(struct softnet_data *sd){ if (IS_ENABLED(CONFIG_RPS) || use_backlog_threads()) spin_unlock_irq(&sd->input_pkt_queue.lock); else local_irq_enable();}
static struct netdev_name_node *netdev_name_node_alloc(struct net_device *dev, const char *name){ struct netdev_name_node *name_node;
name_node = kmalloc_obj(*name_node); if (!name_node) return NULL; INIT_HLIST_NODE(&name_node->hlist); name_node->dev = dev; name_node->name = name; return name_node;}
static struct netdev_name_node *netdev_name_node_head_alloc(struct net_device *dev){ struct netdev_name_node *name_node;
name_node = netdev_name_node_alloc(dev, dev->name); if (!name_node) return NULL; INIT_LIST_HEAD(&name_node->list); return name_node;}
static void netdev_name_node_free(struct netdev_name_node *name_node){ kfree(name_node);}
static void netdev_name_node_add(struct net *net, struct netdev_name_node *name_node){ hlist_add_head_rcu(&name_node->hlist, dev_name_hash(net, name_node->name));}
static void netdev_name_node_del(struct netdev_name_node *name_node){ hlist_del_rcu(&name_node->hlist);}
static struct netdev_name_node *netdev_name_node_lookup(struct net *net, const char *name){ struct hlist_head *head = dev_name_hash(net, name); struct netdev_name_node *name_node;
hlist_for_each_entry(name_node, head, hlist) if (!strcmp(name_node->name, name)) return name_node; return NULL;}
static struct netdev_name_node *netdev_name_node_lookup_rcu(struct net *net, const char *name){ struct hlist_head *head = dev_name_hash(net, name); struct netdev_name_node *name_node;
hlist_for_each_entry_rcu(name_node, head, hlist) if (!strcmp(name_node->name, name)) return name_node; return NULL;}
bool netdev_name_in_use(struct net *net, const char *name){ return netdev_name_node_lookup(net, name);}EXPORT_SYMBOL(netdev_name_in_use);
int netdev_name_node_alt_create(struct net_device *dev, const char *name){ struct netdev_name_node *name_node; struct net *net = dev_net(dev);
name_node = netdev_name_node_lookup(net, name); if (name_node) return -EEXIST; name_node = netdev_name_node_alloc(dev, name); if (!name_node) return -ENOMEM; netdev_name_node_add(net, name_node); /* The node that holds dev->name acts as a head of per-device list. */ list_add_tail_rcu(&name_node->list, &dev->name_node->list);
return 0;}
static void netdev_name_node_alt_free(struct rcu_head *head){ struct netdev_name_node *name_node = container_of(head, struct netdev_name_node, rcu);
kfree(name_node->name); netdev_name_node_free(name_node);}
static void __netdev_name_node_alt_destroy(struct netdev_name_node *name_node){ netdev_name_node_del(name_node); list_del_rcu(&name_node->list); call_rcu(&name_node->rcu, netdev_name_node_alt_free);}
int netdev_name_node_alt_destroy(struct net_device *dev, const char *name){ struct netdev_name_node *name_node; struct net *net = dev_net(dev);
name_node = netdev_name_node_lookup(net, name); if (!name_node) return -ENOENT; /* lookup might have found our primary name or a name belonging * to another device. */ if (name_node == dev->name_node || name_node->dev != dev) return -EINVAL;
__netdev_name_node_alt_destroy(name_node); return 0;}
static void netdev_name_node_alt_flush(struct net_device *dev){ struct netdev_name_node *name_node, *tmp;
list_for_each_entry_safe(name_node, tmp, &dev->name_node->list, list) { list_del(&name_node->list); netdev_name_node_alt_free(&name_node->rcu); }}
/* Device list insertion */static void list_netdevice(struct net_device *dev){ struct netdev_name_node *name_node; struct net *net = dev_net(dev);
ASSERT_RTNL();
list_add_tail_rcu(&dev->dev_list, &net->dev_base_head); netdev_name_node_add(net, dev->name_node); hlist_add_head_rcu(&dev->index_hlist, dev_index_hash(net, dev->ifindex));
netdev_for_each_altname(dev, name_node) netdev_name_node_add(net, name_node);
/* We reserved the ifindex, this can't fail */ WARN_ON(xa_store(&net->dev_by_index, dev->ifindex, dev, GFP_KERNEL));
dev_base_seq_inc(net);}
/* Device list removal * caller must respect a RCU grace period before freeing/reusing dev */static void unlist_netdevice(struct net_device *dev){ struct netdev_name_node *name_node; struct net *net = dev_net(dev);
ASSERT_RTNL();
xa_erase(&net->dev_by_index, dev->ifindex);
netdev_for_each_altname(dev, name_node) netdev_name_node_del(name_node);
/* Unlink dev from the device chain */ list_del_rcu(&dev->dev_list); netdev_name_node_del(dev->name_node); hlist_del_rcu(&dev->index_hlist);
dev_base_seq_inc(dev_net(dev));}
/* * Our notifier list */
static RAW_NOTIFIER_HEAD(netdev_chain);
/* * Device drivers call our routines to queue packets here. We empty the * queue in the local softnet handler. */
DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data) = { .process_queue_bh_lock = INIT_LOCAL_LOCK(process_queue_bh_lock),};EXPORT_PER_CPU_SYMBOL(softnet_data);
/* Page_pool has a lockless array/stack to alloc/recycle pages. * PP consumers must pay attention to run APIs in the appropriate context * (e.g. NAPI context). */DEFINE_PER_CPU(struct page_pool_bh, system_page_pool) = { .bh_lock = INIT_LOCAL_LOCK(bh_lock),};
#ifdef CONFIG_LOCKDEP/* * register_netdevice() inits txq->_xmit_lock and sets lockdep class * according to dev->type */static const unsigned short netdev_lock_type[] = { ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, ARPHRD_CAN, ARPHRD_MCTP, ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, ARPHRD_RAWHDLC, ARPHRD_RAWIP, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_IEEE802154, ARPHRD_IEEE802154_MONITOR, ARPHRD_PHONET, ARPHRD_PHONET_PIPE, ARPHRD_CAIF, ARPHRD_IP6GRE, ARPHRD_NETLINK, ARPHRD_6LOWPAN, ARPHRD_VSOCKMON, ARPHRD_VOID, ARPHRD_NONE};
static const char *const netdev_lock_name[] = { "_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", "_xmit_CAN", "_xmit_MCTP", "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", "_xmit_RAWHDLC", "_xmit_RAWIP", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_IEEE802154", "_xmit_IEEE802154_MONITOR", "_xmit_PHONET", "_xmit_PHONET_PIPE", "_xmit_CAIF", "_xmit_IP6GRE", "_xmit_NETLINK", "_xmit_6LOWPAN", "_xmit_VSOCKMON", "_xmit_VOID", "_xmit_NONE"};
static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
static inline unsigned short netdev_lock_pos(unsigned short dev_type){ int i;
for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) if (netdev_lock_type[i] == dev_type) return i; /* the last key is used by default */ WARN_ONCE(1, "netdev_lock_pos() could not find dev_type=%u\n", dev_type); return ARRAY_SIZE(netdev_lock_type) - 1;}
static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, unsigned short dev_type){ int i;
i = netdev_lock_pos(dev_type); lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], netdev_lock_name[i]);}
static inline void netdev_set_addr_lockdep_class(struct net_device *dev){ int i;
i = netdev_lock_pos(dev->type); lockdep_set_class_and_name(&dev->addr_list_lock, &netdev_addr_lock_key[i], netdev_lock_name[i]);}#elsestatic inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, unsigned short dev_type){}
static inline void netdev_set_addr_lockdep_class(struct net_device *dev){}#endif
/******************************************************************************* * * Protocol management and registration routines * *******************************************************************************/
/* * Add a protocol ID to the list. Now that the input handler is * smarter we can dispense with all the messy stuff that used to be * here. * * BEWARE!!! Protocol handlers, mangling input packets, * MUST BE last in hash buckets and checking protocol handlers * MUST start from promiscuous ptype_all chain in net_bh. * It is true now, do not change it. * Explanation follows: if protocol handler, mangling packet, will * be the first on list, it is not able to sense, that packet * is cloned and should be copied-on-write, so that it will * change it and subsequent readers will get broken packet. * --ANK (980803) */
static inline struct list_head *ptype_head(const struct packet_type *pt){ if (pt->type == htons(ETH_P_ALL)) { if (!pt->af_packet_net && !pt->dev) return NULL;
return pt->dev ? &pt->dev->ptype_all : &pt->af_packet_net->ptype_all; }
if (pt->dev) return &pt->dev->ptype_specific;
return pt->af_packet_net ? &pt->af_packet_net->ptype_specific : &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];}
/** * dev_add_pack - add packet handler * @pt: packet type declaration * * Add a protocol handler to the networking stack. The passed &packet_type * is linked into kernel lists and may not be freed until it has been * removed from the kernel lists. * * This call does not sleep therefore it can not * guarantee all CPU's that are in middle of receiving packets * will see the new packet type (until the next received packet). */
void dev_add_pack(struct packet_type *pt){ struct list_head *head = ptype_head(pt);
if (WARN_ON_ONCE(!head)) return;
spin_lock(&ptype_lock); list_add_rcu(&pt->list, head); spin_unlock(&ptype_lock);}EXPORT_SYMBOL(dev_add_pack);
/** * __dev_remove_pack - remove packet handler * @pt: packet type declaration * * Remove a protocol handler that was previously added to the kernel * protocol handlers by dev_add_pack(). The passed &packet_type is removed * from the kernel lists and can be freed or reused once this function * returns. * * The packet type might still be in use by receivers * and must not be freed until after all the CPU's have gone * through a quiescent state. */void __dev_remove_pack(struct packet_type *pt){ struct list_head *head = ptype_head(pt); struct packet_type *pt1;
if (!head) return;
spin_lock(&ptype_lock);
list_for_each_entry(pt1, head, list) { if (pt == pt1) { list_del_rcu(&pt->list); goto out; } }
pr_warn("dev_remove_pack: %p not found\n", pt);out: spin_unlock(&ptype_lock);}EXPORT_SYMBOL(__dev_remove_pack);
/** * dev_remove_pack - remove packet handler * @pt: packet type declaration * * Remove a protocol handler that was previously added to the kernel * protocol handlers by dev_add_pack(). The passed &packet_type is removed * from the kernel lists and can be freed or reused once this function * returns. * * This call sleeps to guarantee that no CPU is looking at the packet * type after return. */void dev_remove_pack(struct packet_type *pt){ __dev_remove_pack(pt);
synchronize_net();}EXPORT_SYMBOL(dev_remove_pack);
/******************************************************************************* * * Device Interface Subroutines * *******************************************************************************/
/** * dev_get_iflink - get 'iflink' value of a interface * @dev: targeted interface * * Indicates the ifindex the interface is linked to. * Physical interfaces have the same 'ifindex' and 'iflink' values. */
int dev_get_iflink(const struct net_device *dev){ if (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink) return dev->netdev_ops->ndo_get_iflink(dev);
return READ_ONCE(dev->ifindex);}EXPORT_SYMBOL(dev_get_iflink);
/** * dev_fill_metadata_dst - Retrieve tunnel egress information. * @dev: targeted interface * @skb: The packet. * * For better visibility of tunnel traffic OVS needs to retrieve * egress tunnel information for a packet. Following API allows * user to get this info. */int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb){ struct ip_tunnel_info *info;
if (!dev->netdev_ops || !dev->netdev_ops->ndo_fill_metadata_dst) return -EINVAL;
info = skb_tunnel_info_unclone(skb); if (!info) return -ENOMEM; if (unlikely(!(info->mode & IP_TUNNEL_INFO_TX))) return -EINVAL;
return dev->netdev_ops->ndo_fill_metadata_dst(dev, skb);}EXPORT_SYMBOL_GPL(dev_fill_metadata_dst);
static struct net_device_path *dev_fwd_path(struct net_device_path_stack *stack){ if (stack->num_paths + 1 > NET_DEVICE_PATH_STACK_MAX) return NULL;
return &stack->path[stack->num_paths];}
void dev_fill_forward_path_release(struct net_device_path_stack *stack){ struct net_device_path *path; int k;
if (stack->num_paths == 0) return;
for (k = stack->num_paths - 1; k >= 0; k--) { path = &stack->path[k]; switch (path->type) { case DEV_PATH_TUN: dst_release(path->tun.dst); break; default: break; } }}EXPORT_SYMBOL_GPL(dev_fill_forward_path_release);
int dev_fill_forward_path(struct net_device_path_ctx *ctx, struct net_device_path_stack *stack){ const struct net_device *last_dev; struct net_device_path *path; int ret = 0;
stack->num_paths = 0; while (ctx->dev && ctx->dev->netdev_ops->ndo_fill_forward_path) { last_dev = ctx->dev; path = dev_fwd_path(stack); if (!path) goto err_out;
memset(path, 0, sizeof(struct net_device_path)); ret = ctx->dev->netdev_ops->ndo_fill_forward_path(ctx, path); if (ret < 0) goto err_out;
stack->num_paths++; if (last_dev == ctx->dev) goto err_out; }
if (!ctx->dev) return ret;
path = dev_fwd_path(stack); if (!path) goto err_out;
path->type = DEV_PATH_ETHERNET; path->dev = ctx->dev; stack->num_paths++;
return 0;err_out: dev_fill_forward_path_release(stack);
return -1;}EXPORT_SYMBOL_GPL(dev_fill_forward_path);
/* must be called under rcu_read_lock(), as we dont take a reference */static struct napi_struct *napi_by_id(unsigned int napi_id){ unsigned int hash = napi_id % HASH_SIZE(napi_hash); struct napi_struct *napi;
hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node) if (napi->napi_id == napi_id) return napi;
return NULL;}
/* must be called under rcu_read_lock(), as we dont take a reference */static struct napi_struct *netdev_napi_by_id(struct net *net, unsigned int napi_id){ struct napi_struct *napi;
napi = napi_by_id(napi_id); if (!napi) return NULL;
if (WARN_ON_ONCE(!napi->dev)) return NULL; if (!net_eq(net, dev_net(napi->dev))) return NULL;
return napi;}
/** * netdev_napi_by_id_lock() - find a device by NAPI ID and lock it * @net: the applicable net namespace * @napi_id: ID of a NAPI of a target device * * Find a NAPI instance with @napi_id. Lock its device. * The device must be in %NETREG_REGISTERED state for lookup to succeed. * netdev_unlock() must be called to release it. * * Return: pointer to NAPI, its device with lock held, NULL if not found. */struct napi_struct *netdev_napi_by_id_lock(struct net *net, unsigned int napi_id){ struct napi_struct *napi; struct net_device *dev;
rcu_read_lock(); napi = netdev_napi_by_id(net, napi_id); if (!napi || READ_ONCE(napi->dev->reg_state) != NETREG_REGISTERED) { rcu_read_unlock(); return NULL; }
dev = napi->dev; dev_hold(dev); rcu_read_unlock();
dev = __netdev_put_lock(dev, net); if (!dev) return NULL;
rcu_read_lock(); napi = netdev_napi_by_id(net, napi_id); if (napi && napi->dev != dev) napi = NULL; rcu_read_unlock();
if (!napi) netdev_unlock(dev); return napi;}
/** * __dev_get_by_name - find a device by its name * @net: the applicable net namespace * @name: name to find * * Find an interface by name. Must be called under RTNL semaphore. * If the name is found a pointer to the device is returned. * If the name is not found then %NULL is returned. The * reference counters are not incremented so the caller must be * careful with locks. */
struct net_device *__dev_get_by_name(struct net *net, const char *name){ struct netdev_name_node *node_name;
node_name = netdev_name_node_lookup(net, name); return node_name ? node_name->dev : NULL;}EXPORT_SYMBOL(__dev_get_by_name);
/** * dev_get_by_name_rcu - find a device by its name * @net: the applicable net namespace * @name: name to find * * Find an interface by name. * If the name is found a pointer to the device is returned. * If the name is not found then %NULL is returned. * The reference counters are not incremented so the caller must be * careful with locks. The caller must hold RCU lock. */
struct net_device *dev_get_by_name_rcu(struct net *net, const char *name){ struct netdev_name_node *node_name;
node_name = netdev_name_node_lookup_rcu(net, name); return node_name ? node_name->dev : NULL;}EXPORT_SYMBOL(dev_get_by_name_rcu);
/* Deprecated for new users, call netdev_get_by_name() instead */struct net_device *dev_get_by_name(struct net *net, const char *name){ struct net_device *dev;
rcu_read_lock(); dev = dev_get_by_name_rcu(net, name); dev_hold(dev); rcu_read_unlock(); return dev;}EXPORT_SYMBOL(dev_get_by_name);
/** * netdev_get_by_name() - find a device by its name * @net: the applicable net namespace * @name: name to find * @tracker: tracking object for the acquired reference * @gfp: allocation flags for the tracker * * Find an interface by name. This can be called from any * context and does its own locking. The returned handle has * the usage count incremented and the caller must use netdev_put() to * release it when it is no longer needed. %NULL is returned if no * matching device is found. */struct net_device *netdev_get_by_name(struct net *net, const char *name, netdevice_tracker *tracker, gfp_t gfp){ struct net_device *dev;
dev = dev_get_by_name(net, name); if (dev) netdev_tracker_alloc(dev, tracker, gfp); return dev;}EXPORT_SYMBOL(netdev_get_by_name);
/** * __dev_get_by_index - find a device by its ifindex * @net: the applicable net namespace * @ifindex: index of device * * Search for an interface by index. Returns %NULL if the device * is not found or a pointer to the device. The device has not * had its reference counter increased so the caller must be careful * about locking. The caller must hold the RTNL semaphore. */
struct net_device *__dev_get_by_index(struct net *net, int ifindex){ struct net_device *dev; struct hlist_head *head = dev_index_hash(net, ifindex);
hlist_for_each_entry(dev, head, index_hlist) if (dev->ifindex == ifindex) return dev;
return NULL;}EXPORT_SYMBOL(__dev_get_by_index);
/** * dev_get_by_index_rcu - find a device by its ifindex * @net: the applicable net namespace * @ifindex: index of device * * Search for an interface by index. Returns %NULL if the device * is not found or a pointer to the device. The device has not * had its reference counter increased so the caller must be careful * about locking. The caller must hold RCU lock. */
struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex){ struct net_device *dev; struct hlist_head *head = dev_index_hash(net, ifindex);
hlist_for_each_entry_rcu(dev, head, index_hlist) if (dev->ifindex == ifindex) return dev;
return NULL;}EXPORT_SYMBOL(dev_get_by_index_rcu);
/* Deprecated for new users, call netdev_get_by_index() instead */struct net_device *dev_get_by_index(struct net *net, int ifindex){ struct net_device *dev;
rcu_read_lock(); dev = dev_get_by_index_rcu(net, ifindex); dev_hold(dev); rcu_read_unlock(); return dev;}EXPORT_SYMBOL(dev_get_by_index);
/** * netdev_get_by_index() - find a device by its ifindex * @net: the applicable net namespace * @ifindex: index of device * @tracker: tracking object for the acquired reference * @gfp: allocation flags for the tracker * * Search for an interface by index. Returns NULL if the device * is not found or a pointer to the device. The device returned has * had a reference added and the pointer is safe until the user calls * netdev_put() to indicate they have finished with it. */struct net_device *netdev_get_by_index(struct net *net, int ifindex, netdevice_tracker *tracker, gfp_t gfp){ struct net_device *dev;
dev = dev_get_by_index(net, ifindex); if (dev) netdev_tracker_alloc(dev, tracker, gfp); return dev;}EXPORT_SYMBOL(netdev_get_by_index);
/** * dev_get_by_napi_id - find a device by napi_id * @napi_id: ID of the NAPI struct * * Search for an interface by NAPI ID. Returns %NULL if the device * is not found or a pointer to the device. The device has not had * its reference counter increased so the caller must be careful * about locking. The caller must hold RCU lock. */struct net_device *dev_get_by_napi_id(unsigned int napi_id){ struct napi_struct *napi;
WARN_ON_ONCE(!rcu_read_lock_held());
if (!napi_id_valid(napi_id)) return NULL;
napi = napi_by_id(napi_id);
return napi ? napi->dev : NULL;}
/* Release the held reference on the net_device, and if the net_device * is still registered try to lock the instance lock. If device is being * unregistered NULL will be returned (but the reference has been released, * either way!) * * This helper is intended for locking net_device after it has been looked up * using a lockless lookup helper. Lock prevents the instance from going away. */struct net_device *netdev_put_lock(struct net_device *dev, struct net *net, netdevice_tracker *tracker){ netdev_lock(dev); if (dev->reg_state > NETREG_REGISTERED || dev->moving_ns || !net_eq(dev_net(dev), net)) { netdev_unlock(dev); netdev_put(dev, tracker); return NULL; } netdev_put(dev, tracker); return dev;}
static struct net_device *__netdev_put_lock_ops_compat(struct net_device *dev, struct net *net){ netdev_lock_ops_compat(dev); if (dev->reg_state > NETREG_REGISTERED || dev->moving_ns || !net_eq(dev_net(dev), net)) { netdev_unlock_ops_compat(dev); dev_put(dev); return NULL; } dev_put(dev); return dev;}
/** * netdev_get_by_index_lock() - find a device by its ifindex * @net: the applicable net namespace * @ifindex: index of device * * Search for an interface by index. If a valid device * with @ifindex is found it will be returned with netdev->lock held. * netdev_unlock() must be called to release it. * * Return: pointer to a device with lock held, NULL if not found. */struct net_device *netdev_get_by_index_lock(struct net *net, int ifindex){ struct net_device *dev;
dev = dev_get_by_index(net, ifindex); if (!dev) return NULL;
return __netdev_put_lock(dev, net);}
struct net_device *netdev_get_by_index_lock_ops_compat(struct net *net, int ifindex){ struct net_device *dev;
dev = dev_get_by_index(net, ifindex); if (!dev) return NULL;
return __netdev_put_lock_ops_compat(dev, net);}
struct net_device *netdev_xa_find_lock(struct net *net, struct net_device *dev, unsigned long *index){ if (dev) netdev_unlock(dev);
do { rcu_read_lock(); dev = xa_find(&net->dev_by_index, index, ULONG_MAX, XA_PRESENT); if (!dev) { rcu_read_unlock(); return NULL; } dev_hold(dev); rcu_read_unlock();
dev = __netdev_put_lock(dev, net); if (dev) return dev;
(*index)++; } while (true);}
struct net_device *netdev_xa_find_lock_ops_compat(struct net *net, struct net_device *dev, unsigned long *index){ if (dev) netdev_unlock_ops_compat(dev);
do { rcu_read_lock(); dev = xa_find(&net->dev_by_index, index, ULONG_MAX, XA_PRESENT); if (!dev) { rcu_read_unlock(); return NULL; } dev_hold(dev); rcu_read_unlock();
dev = __netdev_put_lock_ops_compat(dev, net); if (dev) return dev;
(*index)++; } while (true);}
static DEFINE_SEQLOCK(netdev_rename_lock);
void netdev_copy_name(struct net_device *dev, char *name){ unsigned int seq;
do { seq = read_seqbegin(&netdev_rename_lock); strscpy(name, dev->name, IFNAMSIZ); } while (read_seqretry(&netdev_rename_lock, seq));}
/** * netdev_get_name - get a netdevice name, knowing its ifindex. * @net: network namespace * @name: a pointer to the buffer where the name will be stored. * @ifindex: the ifindex of the interface to get the name from. */int netdev_get_name(struct net *net, char *name, int ifindex){ struct net_device *dev; int ret;
rcu_read_lock();
dev = dev_get_by_index_rcu(net, ifindex); if (!dev) { ret = -ENODEV; goto out; }
netdev_copy_name(dev, name);
ret = 0;out: rcu_read_unlock(); return ret;}
static bool dev_addr_cmp(struct net_device *dev, unsigned short type, const char *ha){ return dev->type == type && !memcmp(dev->dev_addr, ha, dev->addr_len);}
/** * dev_getbyhwaddr_rcu - find a device by its hardware address * @net: the applicable net namespace * @type: media type of device * @ha: hardware address * * Search for an interface by MAC address. Returns NULL if the device * is not found or a pointer to the device. * The caller must hold RCU. * The returned device has not had its ref count increased * and the caller must therefore be careful about locking * */
struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, const char *ha){ struct net_device *dev;
for_each_netdev_rcu(net, dev) if (dev_addr_cmp(dev, type, ha)) return dev;
return NULL;}EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
/** * dev_getbyhwaddr() - find a device by its hardware address * @net: the applicable net namespace * @type: media type of device * @ha: hardware address * * Similar to dev_getbyhwaddr_rcu(), but the owner needs to hold * rtnl_lock. * * Context: rtnl_lock() must be held. * Return: pointer to the net_device, or NULL if not found */struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, const char *ha){ struct net_device *dev;
ASSERT_RTNL(); for_each_netdev(net, dev) if (dev_addr_cmp(dev, type, ha)) return dev;
return NULL;}EXPORT_SYMBOL(dev_getbyhwaddr);
struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type){ struct net_device *dev, *ret = NULL;
rcu_read_lock(); for_each_netdev_rcu(net, dev) if (dev->type == type) { dev_hold(dev); ret = dev; break; } rcu_read_unlock(); return ret;}EXPORT_SYMBOL(dev_getfirstbyhwtype);
/** * netdev_get_by_flags_rcu - find any device with given flags * @net: the applicable net namespace * @tracker: tracking object for the acquired reference * @if_flags: IFF_* values * @mask: bitmask of bits in if_flags to check * * Search for any interface with the given flags. * * Context: rcu_read_lock() must be held. * Returns: NULL if a device is not found or a pointer to the device. */struct net_device *netdev_get_by_flags_rcu(struct net *net, netdevice_tracker *tracker, unsigned short if_flags, unsigned short mask){ struct net_device *dev;
for_each_netdev_rcu(net, dev) { if (((READ_ONCE(dev->flags) ^ if_flags) & mask) == 0) { netdev_hold(dev, tracker, GFP_ATOMIC); return dev; } }
return NULL;}
/** * dev_valid_name - check if name is okay for network device * @name: name string * * Network device names need to be valid file names to * allow sysfs to work. We also disallow any kind of * whitespace. */bool dev_valid_name(const char *name){ if (*name == '\0') return false; if (strnlen(name, IFNAMSIZ) == IFNAMSIZ) return false; if (!strcmp(name, ".") || !strcmp(name, "..")) return false;
while (*name) { if (*name == '/' || *name == ':' || isspace(*name)) return false; name++; } return true;}EXPORT_SYMBOL(dev_valid_name);
/** * __dev_alloc_name - allocate a name for a device * @net: network namespace to allocate the device name in * @name: name format string * @res: result name string * * Passed a format string - eg "lt%d" it will try and find a suitable * id. It scans list of devices to build up a free map, then chooses * the first empty slot. The caller must hold the dev_base or rtnl lock * while allocating the name and adding the device in order to avoid * duplicates. * Limited to bits_per_byte * page size devices (ie 32K on most platforms). * Returns the number of the unit assigned or a negative errno code. */
static int __dev_alloc_name(struct net *net, const char *name, char *res){ int i = 0; const char *p; const int max_netdevices = 8*PAGE_SIZE; unsigned long *inuse; struct net_device *d; char buf[IFNAMSIZ];
/* Verify the string as this thing may have come from the user. * There must be one "%d" and no other "%" characters. */ p = strchr(name, '%'); if (!p || p[1] != 'd' || strchr(p + 2, '%')) return -EINVAL;
/* Use one page as a bit array of possible slots */ inuse = bitmap_zalloc(max_netdevices, GFP_ATOMIC); if (!inuse) return -ENOMEM;
for_each_netdev(net, d) { struct netdev_name_node *name_node;
netdev_for_each_altname(d, name_node) { if (!sscanf(name_node->name, name, &i)) continue; if (i < 0 || i >= max_netdevices) continue;
/* avoid cases where sscanf is not exact inverse of printf */ snprintf(buf, IFNAMSIZ, name, i); if (!strncmp(buf, name_node->name, IFNAMSIZ)) __set_bit(i, inuse); } if (!sscanf(d->name, name, &i)) continue; if (i < 0 || i >= max_netdevices) continue;
/* avoid cases where sscanf is not exact inverse of printf */ snprintf(buf, IFNAMSIZ, name, i); if (!strncmp(buf, d->name, IFNAMSIZ)) __set_bit(i, inuse); }
i = find_first_zero_bit(inuse, max_netdevices); bitmap_free(inuse); if (i == max_netdevices) return -ENFILE;
/* 'res' and 'name' could overlap, use 'buf' as an intermediate buffer */ strscpy(buf, name, IFNAMSIZ); snprintf(res, IFNAMSIZ, buf, i); return i;}
/* Returns negative errno or allocated unit id (see __dev_alloc_name()) */static int dev_prep_valid_name(struct net *net, struct net_device *dev, const char *want_name, char *out_name, int dup_errno){ if (!dev_valid_name(want_name)) return -EINVAL;
if (strchr(want_name, '%')) return __dev_alloc_name(net, want_name, out_name);
if (netdev_name_in_use(net, want_name)) return -dup_errno; if (out_name != want_name) strscpy(out_name, want_name, IFNAMSIZ); return 0;}
/** * dev_alloc_name - allocate a name for a device * @dev: device * @name: name format string * * Passed a format string - eg "lt%d" it will try and find a suitable * id. It scans list of devices to build up a free map, then chooses * the first empty slot. The caller must hold the dev_base or rtnl lock * while allocating the name and adding the device in order to avoid * duplicates. * Limited to bits_per_byte * page size devices (ie 32K on most platforms). * Returns the number of the unit assigned or a negative errno code. */
int dev_alloc_name(struct net_device *dev, const char *name){ return dev_prep_valid_name(dev_net(dev), dev, name, dev->name, ENFILE);}EXPORT_SYMBOL(dev_alloc_name);
static int dev_get_valid_name(struct net *net, struct net_device *dev, const char *name){ int ret;
ret = dev_prep_valid_name(net, dev, name, dev->name, EEXIST); return ret < 0 ? ret : 0;}
int netif_change_name(struct net_device *dev, const char *newname){ struct net *net = dev_net(dev); unsigned char old_assign_type; char oldname[IFNAMSIZ]; int err = 0; int ret;
ASSERT_RTNL_NET(net);
if (!strncmp(newname, dev->name, IFNAMSIZ)) return 0;
memcpy(oldname, dev->name, IFNAMSIZ);
write_seqlock_bh(&netdev_rename_lock); err = dev_get_valid_name(net, dev, newname); write_sequnlock_bh(&netdev_rename_lock);
if (err < 0) return err;
if (oldname[0] && !strchr(oldname, '%')) netdev_info(dev, "renamed from %s%s\n", oldname, dev->flags & IFF_UP ? " (while UP)" : "");
old_assign_type = dev->name_assign_type; WRITE_ONCE(dev->name_assign_type, NET_NAME_RENAMED);
rollback: ret = device_rename(&dev->dev, dev->name); if (ret) { write_seqlock_bh(&netdev_rename_lock); memcpy(dev->name, oldname, IFNAMSIZ); write_sequnlock_bh(&netdev_rename_lock); WRITE_ONCE(dev->name_assign_type, old_assign_type); return ret; }
netdev_adjacent_rename_links(dev, oldname);
netdev_name_node_del(dev->name_node);
synchronize_net();
netdev_name_node_add(net, dev->name_node);
ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); ret = notifier_to_errno(ret);
if (ret) { /* err >= 0 after dev_alloc_name() or stores the first errno */ if (err >= 0) { err = ret; write_seqlock_bh(&netdev_rename_lock); memcpy(dev->name, oldname, IFNAMSIZ); write_sequnlock_bh(&netdev_rename_lock); memcpy(oldname, newname, IFNAMSIZ); WRITE_ONCE(dev->name_assign_type, old_assign_type); old_assign_type = NET_NAME_RENAMED; goto rollback; } else { netdev_err(dev, "name change rollback failed: %d\n", ret); } }
return err;}
int netif_set_alias(struct net_device *dev, const char *alias, size_t len){ struct dev_ifalias *new_alias = NULL;
if (len >= IFALIASZ) return -EINVAL;
if (len) { new_alias = kmalloc(sizeof(*new_alias) + len + 1, GFP_KERNEL); if (!new_alias) return -ENOMEM;
memcpy(new_alias->ifalias, alias, len); new_alias->ifalias[len] = 0; }
mutex_lock(&ifalias_mutex); new_alias = rcu_replace_pointer(dev->ifalias, new_alias, mutex_is_locked(&ifalias_mutex)); mutex_unlock(&ifalias_mutex);
if (new_alias) kfree_rcu(new_alias, rcuhead);
return len;}
/** * dev_get_alias - get ifalias of a device * @dev: device * @name: buffer to store name of ifalias * @len: size of buffer * * get ifalias for a device. Caller must make sure dev cannot go * away, e.g. rcu read lock or own a reference count to device. */int dev_get_alias(const struct net_device *dev, char *name, size_t len){ const struct dev_ifalias *alias; int ret = 0;
rcu_read_lock(); alias = rcu_dereference(dev->ifalias); if (alias) ret = snprintf(name, len, "%s", alias->ifalias); rcu_read_unlock();
return ret;}
/** * netdev_features_change - device changes features * @dev: device to cause notification * * Called to indicate a device has changed features. */void netdev_features_change(struct net_device *dev){ call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);}EXPORT_SYMBOL(netdev_features_change);
void netif_state_change(struct net_device *dev){ netdev_assert_locked_ops_compat_or_invisible(dev);
if (dev->flags & IFF_UP) { struct netdev_notifier_change_info change_info = { .info.dev = dev, };
call_netdevice_notifiers_info(NETDEV_CHANGE, &change_info.info); rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL, 0, NULL); }}
/** * __netdev_notify_peers - notify network peers about existence of @dev, * to be called when rtnl lock is already held. * @dev: network device * * Generate traffic such that interested network peers are aware of * @dev, such as by generating a gratuitous ARP. This may be used when * a device wants to inform the rest of the network about some sort of * reconfiguration such as a failover event or virtual machine * migration. */void __netdev_notify_peers(struct net_device *dev){ ASSERT_RTNL(); call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev); call_netdevice_notifiers(NETDEV_RESEND_IGMP, dev);}EXPORT_SYMBOL(__netdev_notify_peers);
/** * netdev_notify_peers - notify network peers about existence of @dev * @dev: network device * * Generate traffic such that interested network peers are aware of * @dev, such as by generating a gratuitous ARP. This may be used when * a device wants to inform the rest of the network about some sort of * reconfiguration such as a failover event or virtual machine * migration. */void netdev_notify_peers(struct net_device *dev){ rtnl_lock(); __netdev_notify_peers(dev); rtnl_unlock();}EXPORT_SYMBOL(netdev_notify_peers);
static int napi_threaded_poll(void *data);
static int napi_kthread_create(struct napi_struct *n){ int err = 0;
/* Create and wake up the kthread once to put it in * TASK_INTERRUPTIBLE mode to avoid the blocked task * warning and work with loadavg. */ n->thread = kthread_run(napi_threaded_poll, n, "napi/%s-%d", n->dev->name, n->napi_id); if (IS_ERR(n->thread)) { err = PTR_ERR(n->thread); pr_err("kthread_run failed with err %d\n", err); n->thread = NULL; }
return err;}
static int __dev_open(struct net_device *dev, struct netlink_ext_ack *extack){ const struct net_device_ops *ops = dev->netdev_ops; int ret;
ASSERT_RTNL(); dev_addr_check(dev);
if (!netif_device_present(dev)) { /* may be detached because parent is runtime-suspended */ if (dev->dev.parent) pm_runtime_resume(dev->dev.parent); if (!netif_device_present(dev)) return -ENODEV; }
/* Block netpoll from trying to do any rx path servicing. * If we don't do this there is a chance ndo_poll_controller * or ndo_poll may be running while we open the device */ netpoll_poll_disable(dev);
ret = call_netdevice_notifiers_extack(NETDEV_PRE_UP, dev, extack); ret = notifier_to_errno(ret); if (ret) return ret;
set_bit(__LINK_STATE_START, &dev->state);
netdev_assert_locked_ops_compat(dev);
if (ops->ndo_validate_addr) ret = ops->ndo_validate_addr(dev);
if (!ret && ops->ndo_open) ret = ops->ndo_open(dev);
netpoll_poll_enable(dev);
if (ret) clear_bit(__LINK_STATE_START, &dev->state); else { netif_set_up(dev, true); dev_set_rx_mode(dev); dev_activate(dev); add_device_randomness(dev->dev_addr, dev->addr_len); }
return ret;}
int netif_open(struct net_device *dev, struct netlink_ext_ack *extack){ int ret;
if (dev->flags & IFF_UP) return 0;
ret = __dev_open(dev, extack); if (ret < 0) return ret;
rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP | IFF_RUNNING, GFP_KERNEL, 0, NULL); call_netdevice_notifiers(NETDEV_UP, dev);
return ret;}EXPORT_SYMBOL(netif_open);
static void __dev_close_many(struct list_head *head){ struct net_device *dev;
ASSERT_RTNL(); might_sleep();
list_for_each_entry(dev, head, close_list) { /* Temporarily disable netpoll until the interface is down */ netpoll_poll_disable(dev);
call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
clear_bit(__LINK_STATE_START, &dev->state);
/* Synchronize to scheduled poll. We cannot touch poll list, it * can be even on different cpu. So just clear netif_running(). * * dev->stop() will invoke napi_disable() on all of it's * napi_struct instances on this device. */ smp_mb__after_atomic(); /* Commit netif_running(). */ }
dev_deactivate_many(head, true);
list_for_each_entry(dev, head, close_list) { const struct net_device_ops *ops = dev->netdev_ops;
/* * Call the device specific close. This cannot fail. * Only if device is UP * * We allow it to be called even after a DETACH hot-plug * event. */
netdev_assert_locked_ops_compat(dev);
if (ops->ndo_stop) ops->ndo_stop(dev);
netif_rx_mode_cancel_retry(dev); netif_set_up(dev, false); netpoll_poll_enable(dev); }}
static void __dev_close(struct net_device *dev){ LIST_HEAD(single);
list_add(&dev->close_list, &single); __dev_close_many(&single); list_del(&single);}
void netif_close_many(struct list_head *head, bool unlink){ struct net_device *dev, *tmp;
/* Remove the devices that don't need to be closed */ list_for_each_entry_safe(dev, tmp, head, close_list) if (!(dev->flags & IFF_UP)) list_del_init(&dev->close_list);
__dev_close_many(head);
list_for_each_entry_safe(dev, tmp, head, close_list) { netdev_assert_locked_ops_compat(dev); rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP | IFF_RUNNING, GFP_KERNEL, 0, NULL); call_netdevice_notifiers(NETDEV_DOWN, dev); if (unlink) list_del_init(&dev->close_list); }}EXPORT_SYMBOL_NS_GPL(netif_close_many, "NETDEV_INTERNAL");
void netif_close(struct net_device *dev){ if (dev->flags & IFF_UP) { LIST_HEAD(single);
list_add(&dev->close_list, &single); netif_close_many(&single, true); list_del(&single); }}EXPORT_SYMBOL(netif_close);
void netif_disable_lro(struct net_device *dev){ struct net_device *lower_dev; struct list_head *iter;
dev->wanted_features &= ~NETIF_F_LRO; netdev_update_features(dev);
if (unlikely(dev->features & NETIF_F_LRO)) netdev_WARN(dev, "failed to disable LRO!\n");
netdev_for_each_lower_dev(dev, lower_dev, iter) { netdev_lock_ops(lower_dev); netif_disable_lro(lower_dev); netdev_unlock_ops(lower_dev); }}
/** * dev_disable_gro_hw - disable HW Generic Receive Offload on a device * @dev: device * * Disable HW Generic Receive Offload (GRO_HW) on a net device. Must be * called under RTNL. This is needed if Generic XDP is installed on * the device. */static void dev_disable_gro_hw(struct net_device *dev){ dev->wanted_features &= ~NETIF_F_GRO_HW; netdev_update_features(dev);
if (unlikely(dev->features & NETIF_F_GRO_HW)) netdev_WARN(dev, "failed to disable GRO_HW!\n");}
const char *netdev_cmd_to_name(enum netdev_cmd cmd){#define N(val) \ case NETDEV_##val: \ return "NETDEV_" __stringify(val); switch (cmd) { N(UP) N(DOWN) N(REBOOT) N(CHANGE) N(REGISTER) N(UNREGISTER) N(CHANGEMTU) N(CHANGEADDR) N(GOING_DOWN) N(CHANGENAME) N(FEAT_CHANGE) N(BONDING_FAILOVER) N(PRE_UP) N(PRE_TYPE_CHANGE) N(POST_TYPE_CHANGE) N(POST_INIT) N(PRE_UNINIT) N(RELEASE) N(NOTIFY_PEERS) N(JOIN) N(CHANGEUPPER) N(RESEND_IGMP) N(PRECHANGEMTU) N(CHANGEINFODATA) N(BONDING_INFO) N(PRECHANGEUPPER) N(CHANGELOWERSTATE) N(UDP_TUNNEL_PUSH_INFO) N(UDP_TUNNEL_DROP_INFO) N(CHANGE_TX_QUEUE_LEN) N(CVLAN_FILTER_PUSH_INFO) N(CVLAN_FILTER_DROP_INFO) N(SVLAN_FILTER_PUSH_INFO) N(SVLAN_FILTER_DROP_INFO) N(PRE_CHANGEADDR) N(OFFLOAD_XSTATS_ENABLE) N(OFFLOAD_XSTATS_DISABLE) N(OFFLOAD_XSTATS_REPORT_USED) N(OFFLOAD_XSTATS_REPORT_DELTA) N(XDP_FEAT_CHANGE) }#undef N return "UNKNOWN_NETDEV_EVENT";}EXPORT_SYMBOL_GPL(netdev_cmd_to_name);
static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val, struct net_device *dev){ struct netdev_notifier_info info = { .dev = dev, };
return nb->notifier_call(nb, val, &info);}
static int call_netdevice_register_notifiers(struct notifier_block *nb, struct net_device *dev){ int err;
err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev); err = notifier_to_errno(err); if (err) return err;
if (!(dev->flags & IFF_UP)) return 0;
call_netdevice_notifier(nb, NETDEV_UP, dev); return 0;}
static void call_netdevice_unregister_notifiers(struct notifier_block *nb, struct net_device *dev){ if (dev->flags & IFF_UP) { netdev_lock_ops(dev); call_netdevice_notifier(nb, NETDEV_GOING_DOWN, dev); call_netdevice_notifier(nb, NETDEV_DOWN, dev); netdev_unlock_ops(dev); } call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);}
static int call_netdevice_register_net_notifiers(struct notifier_block *nb, struct net *net){ struct net_device *dev; int err;
for_each_netdev(net, dev) { netdev_lock_ops(dev); err = call_netdevice_register_notifiers(nb, dev); netdev_unlock_ops(dev); if (err) goto rollback; } return 0;
rollback: for_each_netdev_continue_reverse(net, dev) call_netdevice_unregister_notifiers(nb, dev); return err;}
static void call_netdevice_unregister_net_notifiers(struct notifier_block *nb, struct net *net){ struct net_device *dev;
for_each_netdev(net, dev) call_netdevice_unregister_notifiers(nb, dev);}
static int dev_boot_phase = 1;
/** * register_netdevice_notifier - register a network notifier block * @nb: notifier * * Register a notifier to be called when network device events occur. * The notifier passed is linked into the kernel structures and must * not be reused until it has been unregistered. A negative errno code * is returned on a failure. * * When registered all registration and up events are replayed * to the new notifier to allow device to have a race free * view of the network device list. */
int register_netdevice_notifier(struct notifier_block *nb){ struct net *net; int err;
/* Close race with setup_net() and cleanup_net() */ down_write(&pernet_ops_rwsem);
/* When RTNL is removed, we need protection for netdev_chain. */ rtnl_lock();
err = raw_notifier_chain_register(&netdev_chain, nb); if (err) goto unlock; if (dev_boot_phase) goto unlock; for_each_net(net) { __rtnl_net_lock(net); err = call_netdevice_register_net_notifiers(nb, net); __rtnl_net_unlock(net); if (err) goto rollback; }
unlock: rtnl_unlock(); up_write(&pernet_ops_rwsem); return err;
rollback: for_each_net_continue_reverse(net) { __rtnl_net_lock(net); call_netdevice_unregister_net_notifiers(nb, net); __rtnl_net_unlock(net); }
raw_notifier_chain_unregister(&netdev_chain, nb); goto unlock;}EXPORT_SYMBOL(register_netdevice_notifier);
/** * unregister_netdevice_notifier - unregister a network notifier block * @nb: notifier * * Unregister a notifier previously registered by * register_netdevice_notifier(). The notifier is unlinked into the * kernel structures and may then be reused. A negative errno code * is returned on a failure. * * After unregistering unregister and down device events are synthesized * for all devices on the device list to the removed notifier to remove * the need for special case cleanup code. */
int unregister_netdevice_notifier(struct notifier_block *nb){ struct net *net; int err;
/* Close race with setup_net() and cleanup_net() */ down_write(&pernet_ops_rwsem); rtnl_lock(); err = raw_notifier_chain_unregister(&netdev_chain, nb); if (err) goto unlock;
for_each_net(net) { __rtnl_net_lock(net); call_netdevice_unregister_net_notifiers(nb, net); __rtnl_net_unlock(net); }
unlock: rtnl_unlock(); up_write(&pernet_ops_rwsem); return err;}EXPORT_SYMBOL(unregister_netdevice_notifier);
static int __register_netdevice_notifier_net(struct net *net, struct notifier_block *nb, bool ignore_call_fail){ int err;
err = raw_notifier_chain_register(&net->netdev_chain, nb); if (err) return err; if (dev_boot_phase) return 0;
err = call_netdevice_register_net_notifiers(nb, net); if (err && !ignore_call_fail) goto chain_unregister;
return 0;
chain_unregister: raw_notifier_chain_unregister(&net->netdev_chain, nb); return err;}
static int __unregister_netdevice_notifier_net(struct net *net, struct notifier_block *nb){ int err;
err = raw_notifier_chain_unregister(&net->netdev_chain, nb); if (err) return err;
call_netdevice_unregister_net_notifiers(nb, net); return 0;}
/** * register_netdevice_notifier_net - register a per-netns network notifier block * @net: network namespace * @nb: notifier * * Register a notifier to be called when network device events occur. * The notifier passed is linked into the kernel structures and must * not be reused until it has been unregistered. A negative errno code * is returned on a failure. * * When registered all registration and up events are replayed * to the new notifier to allow device to have a race free * view of the network device list. */
int register_netdevice_notifier_net(struct net *net, struct notifier_block *nb){ int err;
rtnl_net_lock(net); err = __register_netdevice_notifier_net(net, nb, false); rtnl_net_unlock(net);
return err;}EXPORT_SYMBOL(register_netdevice_notifier_net);
/** * unregister_netdevice_notifier_net - unregister a per-netns * network notifier block * @net: network namespace * @nb: notifier * * Unregister a notifier previously registered by * register_netdevice_notifier_net(). The notifier is unlinked from the * kernel structures and may then be reused. A negative errno code * is returned on a failure. * * After unregistering unregister and down device events are synthesized * for all devices on the device list to the removed notifier to remove * the need for special case cleanup code. */
int unregister_netdevice_notifier_net(struct net *net, struct notifier_block *nb){ int err;
rtnl_net_lock(net); err = __unregister_netdevice_notifier_net(net, nb); rtnl_net_unlock(net);
return err;}EXPORT_SYMBOL(unregister_netdevice_notifier_net);
static void __move_netdevice_notifier_net(struct net *src_net, struct net *dst_net, struct notifier_block *nb){ __unregister_netdevice_notifier_net(src_net, nb); __register_netdevice_notifier_net(dst_net, nb, true);}
static void rtnl_net_dev_lock(struct net_device *dev){ bool again;
do { struct net *net;
again = false;
/* netns might be being dismantled. */ rcu_read_lock(); net = dev_net_rcu(dev); net_passive_inc(net); rcu_read_unlock();
rtnl_net_lock(net);
#ifdef CONFIG_NET_NS /* dev might have been moved to another netns. */ if (!net_eq(net, rcu_access_pointer(dev->nd_net.net))) { rtnl_net_unlock(net); net_passive_dec(net); again = true; }#endif } while (again);}
static void rtnl_net_dev_unlock(struct net_device *dev){ struct net *net = dev_net(dev);
rtnl_net_unlock(net); net_passive_dec(net);}
int register_netdevice_notifier_dev_net(struct net_device *dev, struct notifier_block *nb, struct netdev_net_notifier *nn){ int err;
rtnl_net_dev_lock(dev); err = __register_netdevice_notifier_net(dev_net(dev), nb, false); if (!err) { nn->nb = nb; list_add(&nn->list, &dev->net_notifier_list); } rtnl_net_dev_unlock(dev);
return err;}EXPORT_SYMBOL(register_netdevice_notifier_dev_net);
int unregister_netdevice_notifier_dev_net(struct net_device *dev, struct notifier_block *nb, struct netdev_net_notifier *nn){ int err;
rtnl_net_dev_lock(dev); list_del(&nn->list); err = __unregister_netdevice_notifier_net(dev_net(dev), nb); rtnl_net_dev_unlock(dev);
return err;}EXPORT_SYMBOL(unregister_netdevice_notifier_dev_net);
static void move_netdevice_notifiers_dev_net(struct net_device *dev, struct net *net){ struct netdev_net_notifier *nn;
list_for_each_entry(nn, &dev->net_notifier_list, list) __move_netdevice_notifier_net(dev_net(dev), net, nn->nb);}
/** * call_netdevice_notifiers_info - call all network notifier blocks * @val: value passed unmodified to notifier function * @info: notifier information data * * Call all network notifier blocks. Parameters and return value * are as for raw_notifier_call_chain(). */
int call_netdevice_notifiers_info(unsigned long val, struct netdev_notifier_info *info){ struct net *net = dev_net(info->dev); int ret;
ASSERT_RTNL();
/* Run per-netns notifier block chain first, then run the global one. * Hopefully, one day, the global one is going to be removed after * all notifier block registrators get converted to be per-netns. */ ret = raw_notifier_call_chain(&net->netdev_chain, val, info); if (ret & NOTIFY_STOP_MASK) return ret; return raw_notifier_call_chain(&netdev_chain, val, info);}
/** * call_netdevice_notifiers_info_robust - call per-netns notifier blocks * for and rollback on error * @val_up: value passed unmodified to notifier function * @val_down: value passed unmodified to the notifier function when * recovering from an error on @val_up * @info: notifier information data * * Call all per-netns network notifier blocks, but not notifier blocks on * the global notifier chain. Parameters and return value are as for * raw_notifier_call_chain_robust(). */
static intcall_netdevice_notifiers_info_robust(unsigned long val_up, unsigned long val_down, struct netdev_notifier_info *info){ struct net *net = dev_net(info->dev);
ASSERT_RTNL();
return raw_notifier_call_chain_robust(&net->netdev_chain, val_up, val_down, info);}
static int call_netdevice_notifiers_extack(unsigned long val, struct net_device *dev, struct netlink_ext_ack *extack){ struct netdev_notifier_info info = { .dev = dev, .extack = extack, };
return call_netdevice_notifiers_info(val, &info);}
/** * call_netdevice_notifiers - call all network notifier blocks * @val: value passed unmodified to notifier function * @dev: net_device pointer passed unmodified to notifier function * * Call all network notifier blocks. Parameters and return value * are as for raw_notifier_call_chain(). */
int call_netdevice_notifiers(unsigned long val, struct net_device *dev){ return call_netdevice_notifiers_extack(val, dev, NULL);}EXPORT_SYMBOL(call_netdevice_notifiers);
/** * call_netdevice_notifiers_mtu - call all network notifier blocks * @val: value passed unmodified to notifier function * @dev: net_device pointer passed unmodified to notifier function * @arg: additional u32 argument passed to the notifier function * * Call all network notifier blocks. Parameters and return value * are as for raw_notifier_call_chain(). */static int call_netdevice_notifiers_mtu(unsigned long val, struct net_device *dev, u32 arg){ struct netdev_notifier_info_ext info = { .info.dev = dev, .ext.mtu = arg, };
BUILD_BUG_ON(offsetof(struct netdev_notifier_info_ext, info) != 0);
return call_netdevice_notifiers_info(val, &info.info);}
#ifdef CONFIG_NET_INGRESSstatic DEFINE_STATIC_KEY_FALSE(ingress_needed_key);
void net_inc_ingress_queue(void){ static_branch_inc(&ingress_needed_key);}EXPORT_SYMBOL_GPL(net_inc_ingress_queue);
void net_dec_ingress_queue(void){ static_branch_dec(&ingress_needed_key);}EXPORT_SYMBOL_GPL(net_dec_ingress_queue);#endif
#ifdef CONFIG_NET_EGRESSstatic DEFINE_STATIC_KEY_FALSE(egress_needed_key);
void net_inc_egress_queue(void){ static_branch_inc(&egress_needed_key);}EXPORT_SYMBOL_GPL(net_inc_egress_queue);
void net_dec_egress_queue(void){ static_branch_dec(&egress_needed_key);}EXPORT_SYMBOL_GPL(net_dec_egress_queue);#endif
#ifdef CONFIG_NET_CLS_ACTDEFINE_STATIC_KEY_FALSE(tcf_sw_enabled_key);EXPORT_SYMBOL(tcf_sw_enabled_key);#endif
DEFINE_STATIC_KEY_FALSE(netstamp_needed_key);EXPORT_SYMBOL(netstamp_needed_key);#ifdef CONFIG_JUMP_LABELstatic atomic_t netstamp_needed_deferred;static atomic_t netstamp_wanted;static void netstamp_clear(struct work_struct *work){ int deferred = atomic_xchg(&netstamp_needed_deferred, 0); int wanted;
wanted = atomic_add_return(deferred, &netstamp_wanted); if (wanted > 0) static_branch_enable(&netstamp_needed_key); else static_branch_disable(&netstamp_needed_key);}static DECLARE_WORK(netstamp_work, netstamp_clear);#endif
void net_enable_timestamp(void){#ifdef CONFIG_JUMP_LABEL int wanted = atomic_read(&netstamp_wanted);
while (wanted > 0) { if (atomic_try_cmpxchg(&netstamp_wanted, &wanted, wanted + 1)) return; } atomic_inc(&netstamp_needed_deferred); schedule_work(&netstamp_work);#else static_branch_inc(&netstamp_needed_key);#endif}EXPORT_SYMBOL(net_enable_timestamp);
void net_disable_timestamp(void){#ifdef CONFIG_JUMP_LABEL int wanted = atomic_read(&netstamp_wanted);
while (wanted > 1) { if (atomic_try_cmpxchg(&netstamp_wanted, &wanted, wanted - 1)) return; } atomic_dec(&netstamp_needed_deferred); schedule_work(&netstamp_work);#else static_branch_dec(&netstamp_needed_key);#endif}EXPORT_SYMBOL(net_disable_timestamp);
static inline void net_timestamp_set(struct sk_buff *skb){ skb->tstamp = 0; skb->tstamp_type = SKB_CLOCK_REALTIME; if (static_branch_unlikely(&netstamp_needed_key)) skb->tstamp = ktime_get_real();}
#define net_timestamp_check(COND, SKB) \ if (static_branch_unlikely(&netstamp_needed_key)) { \ if ((COND) && !(SKB)->tstamp) \ (SKB)->tstamp = ktime_get_real(); \ } \
bool is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb){ return __is_skb_forwardable(dev, skb, true);}EXPORT_SYMBOL_GPL(is_skb_forwardable);
static int __dev_forward_skb2(struct net_device *dev, struct sk_buff *skb, bool check_mtu){ int ret = ____dev_forward_skb(dev, skb, check_mtu);
if (likely(!ret)) { skb->protocol = eth_type_trans(skb, dev); skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); }
return ret;}
int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb){ return __dev_forward_skb2(dev, skb, true);}EXPORT_SYMBOL_GPL(__dev_forward_skb);
/** * dev_forward_skb - loopback an skb to another netif * * @dev: destination network device * @skb: buffer to forward * * return values: * NET_RX_SUCCESS (no congestion) * NET_RX_DROP (packet was dropped, but freed) * * dev_forward_skb can be used for injecting an skb from the * start_xmit function of one device into the receive queue * of another device. * * The receiving device may be in another namespace, so * we have to clear all information in the skb that could * impact namespace isolation. */int dev_forward_skb(struct net_device *dev, struct sk_buff *skb){ return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb);}EXPORT_SYMBOL_GPL(dev_forward_skb);
int dev_forward_skb_nomtu(struct net_device *dev, struct sk_buff *skb){ return __dev_forward_skb2(dev, skb, false) ?: netif_rx_internal(skb);}
static int deliver_skb(struct sk_buff *skb, struct packet_type *pt_prev, struct net_device *orig_dev){ if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) return -ENOMEM; refcount_inc(&skb->users); return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);}
static inline void deliver_ptype_list_skb(struct sk_buff *skb, struct packet_type **pt, struct net_device *orig_dev, __be16 type, struct list_head *ptype_list){ struct packet_type *ptype, *pt_prev = *pt;
list_for_each_entry_rcu(ptype, ptype_list, list) { if (ptype->type != type) continue; if (unlikely(pt_prev)) deliver_skb(skb, pt_prev, orig_dev); pt_prev = ptype; } *pt = pt_prev;}
static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb){ if (!ptype->af_packet_priv || !skb->sk) return false;
if (ptype->id_match) return ptype->id_match(ptype, skb->sk); else if ((struct sock *)ptype->af_packet_priv == skb->sk) return true;
return false;}
/** * dev_nit_active_rcu - return true if any network interface taps are in use * * The caller must hold the RCU lock * * @dev: network device to check for the presence of taps */bool dev_nit_active_rcu(const struct net_device *dev){ /* Callers may hold either RCU or RCU BH lock */ WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_bh_held());
return !list_empty(&dev_net(dev)->ptype_all) || !list_empty(&dev->ptype_all);}EXPORT_SYMBOL_GPL(dev_nit_active_rcu);
/* * Support routine. Sends outgoing frames to any network * taps currently in use. */
void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev){ struct packet_type *ptype, *pt_prev = NULL; struct list_head *ptype_list; struct sk_buff *skb2 = NULL;
rcu_read_lock(); ptype_list = &dev_net_rcu(dev)->ptype_all;again: list_for_each_entry_rcu(ptype, ptype_list, list) { if (READ_ONCE(ptype->ignore_outgoing)) continue;
/* Never send packets back to the socket * they originated from - MvS (miquels@drinkel.ow.org) */ if (skb_loop_sk(ptype, skb)) continue;
if (unlikely(pt_prev)) { deliver_skb(skb2, pt_prev, skb->dev); pt_prev = ptype; continue; }
/* need to clone skb, done only once */ skb2 = skb_clone(skb, GFP_ATOMIC); if (!skb2) goto out_unlock;
net_timestamp_set(skb2);
/* skb->nh should be correctly * set by sender, so that the second statement is * just protection against buggy protocols. */ skb_reset_mac_header(skb2);
if (skb_network_header(skb2) < skb2->data || skb_network_header(skb2) > skb_tail_pointer(skb2)) { net_crit_ratelimited("protocol %04x is buggy, dev %s\n", ntohs(skb2->protocol), dev->name); skb_reset_network_header(skb2); }
skb2->transport_header = skb2->network_header; skb2->pkt_type = PACKET_OUTGOING; pt_prev = ptype; }
if (ptype_list != &dev->ptype_all) { ptype_list = &dev->ptype_all; goto again; }out_unlock: if (pt_prev) { if (!skb_orphan_frags_rx(skb2, GFP_ATOMIC)) pt_prev->func(skb2, skb->dev, pt_prev, skb->dev); else kfree_skb(skb2); } rcu_read_unlock();}EXPORT_SYMBOL_GPL(dev_queue_xmit_nit);
/** * netif_setup_tc - Handle tc mappings on real_num_tx_queues change * @dev: Network device * @txq: number of queues available * * If real_num_tx_queues is changed the tc mappings may no longer be * valid. To resolve this verify the tc mapping remains valid and if * not NULL the mapping. With no priorities mapping to this * offset/count pair it will no longer be used. In the worst case TC0 * is invalid nothing can be done so disable priority mappings. If is * expected that drivers will fix this mapping if they can before * calling netif_set_real_num_tx_queues. */static void netif_setup_tc(struct net_device *dev, unsigned int txq){ struct netdev_tc_txq res; int i;
res.combined = READ_ONCE(dev->tc_to_txq[0].combined);
/* If TC0 is invalidated disable TC mapping */ if (res.offset + res.count > txq) { netdev_warn(dev, "Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n"); WRITE_ONCE(dev->num_tc, 0); return; }
/* Invalidated prio to tc mappings set to TC0 */ for (i = 1; i < TC_BITMASK + 1; i++) { int q = netdev_get_prio_tc_map(dev, i);
res.combined = READ_ONCE(dev->tc_to_txq[q].combined); if (res.offset + res.count > txq) { netdev_warn(dev, "Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n", i, q); netdev_set_prio_tc_map(dev, i, 0); } }}
int netdev_txq_to_tc(struct net_device *dev, unsigned int txq){ if (READ_ONCE(dev->num_tc)) { struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; int i;
/* walk through the TCs and see if it falls into any of them */ for (i = 0; i < TC_MAX_QUEUE; i++, tc++) { struct netdev_tc_txq res;
res.combined = READ_ONCE(tc->combined); if ((txq - res.offset) < res.count) return i; }
/* didn't find it, just return -1 to indicate no match */ return -1; }
return 0;}EXPORT_SYMBOL(netdev_txq_to_tc);
#ifdef CONFIG_XPSstatic struct static_key xps_needed __read_mostly;static struct static_key xps_rxqs_needed __read_mostly;static DEFINE_MUTEX(xps_map_mutex);#define xmap_dereference(P) \ rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
static bool remove_xps_queue(struct xps_dev_maps *dev_maps, struct xps_dev_maps *old_maps, int tci, u16 index){ struct xps_map *map = NULL; int pos;
map = xmap_dereference(dev_maps->attr_map[tci]); if (!map) return false;
for (pos = map->len; pos--;) { if (map->queues[pos] != index) continue;
if (map->len > 1) { map->queues[pos] = map->queues[--map->len]; break; }
if (old_maps) RCU_INIT_POINTER(old_maps->attr_map[tci], NULL); RCU_INIT_POINTER(dev_maps->attr_map[tci], NULL); kfree_rcu(map, rcu); return false; }
return true;}
static bool remove_xps_queue_cpu(struct net_device *dev, struct xps_dev_maps *dev_maps, int cpu, u16 offset, u16 count){ int num_tc = dev_maps->num_tc; bool active = false; int tci;
for (tci = cpu * num_tc; num_tc--; tci++) { int i, j;
for (i = count, j = offset; i--; j++) { if (!remove_xps_queue(dev_maps, NULL, tci, j)) break; }
active |= i < 0; }
return active;}
static void reset_xps_maps(struct net_device *dev, struct xps_dev_maps *dev_maps, enum xps_map_type type){ static_key_slow_dec_cpuslocked(&xps_needed); if (type == XPS_RXQS) static_key_slow_dec_cpuslocked(&xps_rxqs_needed);
RCU_INIT_POINTER(dev->xps_maps[type], NULL);
kfree_rcu(dev_maps, rcu);}
static void clean_xps_maps(struct net_device *dev, enum xps_map_type type, u16 offset, u16 count){ struct xps_dev_maps *dev_maps; bool active = false; int i, j;
dev_maps = xmap_dereference(dev->xps_maps[type]); if (!dev_maps) return;
for (j = 0; j < dev_maps->nr_ids; j++) active |= remove_xps_queue_cpu(dev, dev_maps, j, offset, count); if (!active) reset_xps_maps(dev, dev_maps, type);
if (type == XPS_CPUS) { for (i = offset + (count - 1); count--; i--) netdev_queue_numa_node_write( netdev_get_tx_queue(dev, i), NUMA_NO_NODE); }}
static void netif_reset_xps_queues(struct net_device *dev, u16 offset, u16 count){ if (!static_key_false(&xps_needed)) return;
cpus_read_lock(); mutex_lock(&xps_map_mutex);
if (static_key_false(&xps_rxqs_needed)) clean_xps_maps(dev, XPS_RXQS, offset, count);
clean_xps_maps(dev, XPS_CPUS, offset, count);
mutex_unlock(&xps_map_mutex); cpus_read_unlock();}
static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index){ netif_reset_xps_queues(dev, index, dev->num_tx_queues - index);}
static struct xps_map *expand_xps_map(struct xps_map *map, int attr_index, u16 index, bool is_rxqs_map){ struct xps_map *new_map; int alloc_len = XPS_MIN_MAP_ALLOC; int i, pos;
for (pos = 0; map && pos < map->len; pos++) { if (map->queues[pos] != index) continue; return map; }
/* Need to add tx-queue to this CPU's/rx-queue's existing map */ if (map) { if (pos < map->alloc_len) return map;
alloc_len = map->alloc_len * 2; }
/* Need to allocate new map to store tx-queue on this CPU's/rx-queue's * map */ if (is_rxqs_map) new_map = kzalloc(XPS_MAP_SIZE(alloc_len), GFP_KERNEL); else new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL, cpu_to_node(attr_index)); if (!new_map) return NULL;
for (i = 0; i < pos; i++) new_map->queues[i] = map->queues[i]; new_map->alloc_len = alloc_len; new_map->len = pos;
return new_map;}
/* Copy xps maps at a given index */static void xps_copy_dev_maps(struct xps_dev_maps *dev_maps, struct xps_dev_maps *new_dev_maps, int index, int tc, bool skip_tc){ int i, tci = index * dev_maps->num_tc; struct xps_map *map;
/* copy maps belonging to foreign traffic classes */ for (i = 0; i < dev_maps->num_tc; i++, tci++) { if (i == tc && skip_tc) continue;
/* fill in the new device map from the old device map */ map = xmap_dereference(dev_maps->attr_map[tci]); RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); }}
/* Must be called under cpus_read_lock */int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask, u16 index, enum xps_map_type type){ struct xps_dev_maps *dev_maps, *new_dev_maps = NULL, *old_dev_maps = NULL; int maps_sz, num_tc = 1, tc = 0, dev_num_tc; const unsigned long *online_mask = NULL; bool active = false, copy = false; int i, j, tci, numa_node_id = -2; struct xps_map *map, *new_map; unsigned int nr_ids;
WARN_ON_ONCE(index >= dev->num_tx_queues);
dev_num_tc = READ_ONCE(dev->num_tc); if (dev_num_tc) { /* Do not allow XPS on subordinate device directly */ num_tc = dev_num_tc; if (num_tc < 0) return -EINVAL;
/* If queue belongs to subordinate dev use its map */ dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
tc = netdev_txq_to_tc(dev, index); if (tc < 0 || tc >= num_tc) return -EINVAL; }
mutex_lock(&xps_map_mutex);
dev_maps = xmap_dereference(dev->xps_maps[type]); if (type == XPS_RXQS) { maps_sz = XPS_RXQ_DEV_MAPS_SIZE(num_tc, dev->num_rx_queues); nr_ids = dev->num_rx_queues; } else { maps_sz = XPS_CPU_DEV_MAPS_SIZE(num_tc); if (num_possible_cpus() > 1) online_mask = cpumask_bits(cpu_online_mask); nr_ids = nr_cpu_ids; }
if (maps_sz < L1_CACHE_BYTES) maps_sz = L1_CACHE_BYTES;
/* The old dev_maps could be larger or smaller than the one we're * setting up now, as dev->num_tc or nr_ids could have been updated in * between. We could try to be smart, but let's be safe instead and only * copy foreign traffic classes if the two map sizes match. */ if (dev_maps && dev_maps->num_tc == num_tc && dev_maps->nr_ids == nr_ids) copy = true;
/* allocate memory for queue storage */ for (j = -1; j = netif_attrmask_next_and(j, online_mask, mask, nr_ids), j < nr_ids;) { if (!new_dev_maps) { new_dev_maps = kzalloc(maps_sz, GFP_KERNEL); if (!new_dev_maps) { mutex_unlock(&xps_map_mutex); return -ENOMEM; }
new_dev_maps->nr_ids = nr_ids; new_dev_maps->num_tc = num_tc; }
tci = j * num_tc + tc; map = copy ? xmap_dereference(dev_maps->attr_map[tci]) : NULL;
map = expand_xps_map(map, j, index, type == XPS_RXQS); if (!map) goto error;
RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); }
if (!new_dev_maps) goto out_no_new_maps;
if (!dev_maps) { /* Increment static keys at most once per type */ static_key_slow_inc_cpuslocked(&xps_needed); if (type == XPS_RXQS) static_key_slow_inc_cpuslocked(&xps_rxqs_needed); }
for (j = 0; j < nr_ids; j++) { bool skip_tc = false;
tci = j * num_tc + tc; if (netif_attr_test_mask(j, mask, nr_ids) && netif_attr_test_online(j, online_mask, nr_ids)) { /* add tx-queue to CPU/rx-queue maps */ int pos = 0;
skip_tc = true;
map = xmap_dereference(new_dev_maps->attr_map[tci]); while ((pos < map->len) && (map->queues[pos] != index)) pos++;
if (pos == map->len) map->queues[map->len++] = index;#ifdef CONFIG_NUMA if (type == XPS_CPUS) { if (numa_node_id == -2) numa_node_id = cpu_to_node(j); else if (numa_node_id != cpu_to_node(j)) numa_node_id = -1; }#endif }
if (copy) xps_copy_dev_maps(dev_maps, new_dev_maps, j, tc, skip_tc); }
rcu_assign_pointer(dev->xps_maps[type], new_dev_maps);
/* Cleanup old maps */ if (!dev_maps) goto out_no_old_maps;
for (j = 0; j < dev_maps->nr_ids; j++) { for (i = num_tc, tci = j * dev_maps->num_tc; i--; tci++) { map = xmap_dereference(dev_maps->attr_map[tci]); if (!map) continue;
if (copy) { new_map = xmap_dereference(new_dev_maps->attr_map[tci]); if (map == new_map) continue; }
RCU_INIT_POINTER(dev_maps->attr_map[tci], NULL); kfree_rcu(map, rcu); } }
old_dev_maps = dev_maps;
out_no_old_maps: dev_maps = new_dev_maps; active = true;
out_no_new_maps: if (type == XPS_CPUS) /* update Tx queue numa node */ netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index), (numa_node_id >= 0) ? numa_node_id : NUMA_NO_NODE);
if (!dev_maps) goto out_no_maps;
/* removes tx-queue from unused CPUs/rx-queues */ for (j = 0; j < dev_maps->nr_ids; j++) { tci = j * dev_maps->num_tc;
for (i = 0; i < dev_maps->num_tc; i++, tci++) { if (i == tc && netif_attr_test_mask(j, mask, dev_maps->nr_ids) && netif_attr_test_online(j, online_mask, dev_maps->nr_ids)) continue;
active |= remove_xps_queue(dev_maps, copy ? old_dev_maps : NULL, tci, index); } }
if (old_dev_maps) kfree_rcu(old_dev_maps, rcu);
/* free map if not active */ if (!active) reset_xps_maps(dev, dev_maps, type);
out_no_maps: mutex_unlock(&xps_map_mutex);
return 0;error: /* remove any maps that we added */ for (j = 0; j < nr_ids; j++) { for (i = num_tc, tci = j * num_tc; i--; tci++) { new_map = xmap_dereference(new_dev_maps->attr_map[tci]); map = copy ? xmap_dereference(dev_maps->attr_map[tci]) : NULL; if (new_map && new_map != map) kfree(new_map); } }
mutex_unlock(&xps_map_mutex);
kfree(new_dev_maps); return -ENOMEM;}EXPORT_SYMBOL_GPL(__netif_set_xps_queue);
int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask, u16 index){ int ret;
cpus_read_lock(); ret = __netif_set_xps_queue(dev, cpumask_bits(mask), index, XPS_CPUS); cpus_read_unlock();
return ret;}EXPORT_SYMBOL(netif_set_xps_queue);
#endifstatic void netdev_unbind_all_sb_channels(struct net_device *dev){ struct netdev_queue *txq = &dev->_tx[dev->num_tx_queues];
/* Unbind any subordinate channels */ while (txq-- != &dev->_tx[0]) { if (txq->sb_dev) netdev_unbind_sb_channel(dev, txq->sb_dev); }}
void netdev_reset_tc(struct net_device *dev){ int i;
#ifdef CONFIG_XPS netif_reset_xps_queues_gt(dev, 0);#endif netdev_unbind_all_sb_channels(dev);
/* Reset TC configuration of device */ WRITE_ONCE(dev->num_tc, 0); for (i = 0; i < TC_MAX_QUEUE; i++) WRITE_ONCE(dev->tc_to_txq[i].combined, 0); for (i = 0; i <= TC_BITMASK; i++) WRITE_ONCE(dev->prio_tc_map[i], 0);}EXPORT_SYMBOL(netdev_reset_tc);
int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset){ struct netdev_tc_txq res = { .count = count, .offset = offset, };
if (tc >= READ_ONCE(dev->num_tc)) return -EINVAL;
#ifdef CONFIG_XPS netif_reset_xps_queues(dev, offset, count);#endif WRITE_ONCE(dev->tc_to_txq[tc].combined, res.combined); return 0;}EXPORT_SYMBOL(netdev_set_tc_queue);
int netdev_set_num_tc(struct net_device *dev, u8 num_tc){ if (num_tc > TC_MAX_QUEUE) return -EINVAL;
#ifdef CONFIG_XPS netif_reset_xps_queues_gt(dev, 0);#endif netdev_unbind_all_sb_channels(dev);
WRITE_ONCE(dev->num_tc, num_tc); return 0;}EXPORT_SYMBOL(netdev_set_num_tc);
void netdev_unbind_sb_channel(struct net_device *dev, struct net_device *sb_dev){ struct netdev_queue *txq = &dev->_tx[dev->num_tx_queues]; int i;
#ifdef CONFIG_XPS netif_reset_xps_queues_gt(sb_dev, 0);#endif for (i = 0; i < TC_MAX_QUEUE; i++) WRITE_ONCE(sb_dev->tc_to_txq[i].combined, 0); for (i = 0; i <= TC_BITMASK; i++) WRITE_ONCE(sb_dev->prio_tc_map[i], 0);
while (txq-- != &dev->_tx[0]) { if (txq->sb_dev == sb_dev) txq->sb_dev = NULL; }}EXPORT_SYMBOL(netdev_unbind_sb_channel);
int netdev_bind_sb_channel_queue(struct net_device *dev, struct net_device *sb_dev, u8 tc, u16 count, u16 offset){ /* Make certain the sb_dev and dev are already configured */ if (READ_ONCE(sb_dev->num_tc) >= 0 || tc >= READ_ONCE(dev->num_tc)) return -EINVAL;
/* We cannot hand out queues we don't have */ if ((offset + count) > dev->real_num_tx_queues) return -EINVAL;
/* Record the mapping */ struct netdev_tc_txq res = { .count = count, .offset = offset, };
WRITE_ONCE(sb_dev->tc_to_txq[tc].combined, res.combined);
/* Provide a way for Tx queue to find the tc_to_txq map or * XPS map for itself. */ while (count--) netdev_get_tx_queue(dev, count + offset)->sb_dev = sb_dev;
return 0;}EXPORT_SYMBOL(netdev_bind_sb_channel_queue);
int netdev_set_sb_channel(struct net_device *dev, u16 channel){ /* Do not use a multiqueue device to represent a subordinate channel */ if (netif_is_multiqueue(dev)) return -ENODEV;
/* We allow channels 1 - 32767 to be used for subordinate channels. * Channel 0 is meant to be "native" mode and used only to represent * the main root device. We allow writing 0 to reset the device back * to normal mode after being used as a subordinate channel. */ if (channel > S16_MAX) return -EINVAL;
WRITE_ONCE(dev->num_tc, -channel);
return 0;}EXPORT_SYMBOL(netdev_set_sb_channel);
/* * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues * greater than real_num_tx_queues stale skbs on the qdisc must be flushed. */int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq){ bool disabling; int rc;
disabling = txq < dev->real_num_tx_queues;
if (txq < 1 || txq > dev->num_tx_queues) return -EINVAL;
if (dev->reg_state == NETREG_REGISTERED || dev->reg_state == NETREG_UNREGISTERING) { netdev_assert_locked_ops_compat(dev);
rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues, txq); if (rc) return rc;
if (READ_ONCE(dev->num_tc)) netif_setup_tc(dev, txq);
net_shaper_set_real_num_tx_queues(dev, txq);
dev_qdisc_change_real_num_tx(dev, txq);
dev->real_num_tx_queues = txq;
if (disabling) { synchronize_net(); qdisc_reset_all_tx_gt(dev, txq);#ifdef CONFIG_XPS netif_reset_xps_queues_gt(dev, txq);#endif } } else { dev->real_num_tx_queues = txq; }
return 0;}EXPORT_SYMBOL(netif_set_real_num_tx_queues);
/** * netif_set_real_num_rx_queues - set actual number of RX queues used * @dev: Network device * @rxq: Actual number of RX queues * * This must be called either with the rtnl_lock held or before * registration of the net device. Returns 0 on success, or a * negative error code. If called before registration, it always * succeeds. */int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq){ int rc;
if (rxq < 1 || rxq > dev->num_rx_queues) return -EINVAL;
if (dev->reg_state == NETREG_REGISTERED) { netdev_assert_locked_ops_compat(dev);
rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues, rxq); if (rc) return rc; }
dev->real_num_rx_queues = rxq; return 0;}EXPORT_SYMBOL(netif_set_real_num_rx_queues);
/** * netif_set_real_num_queues - set actual number of RX and TX queues used * @dev: Network device * @txq: Actual number of TX queues * @rxq: Actual number of RX queues * * Set the real number of both TX and RX queues. * Does nothing if the number of queues is already correct. */int netif_set_real_num_queues(struct net_device *dev, unsigned int txq, unsigned int rxq){ unsigned int old_rxq = dev->real_num_rx_queues; int err;
if (txq < 1 || txq > dev->num_tx_queues || rxq < 1 || rxq > dev->num_rx_queues) return -EINVAL;
/* Start from increases, so the error path only does decreases - * decreases can't fail. */ if (rxq > dev->real_num_rx_queues) { err = netif_set_real_num_rx_queues(dev, rxq); if (err) return err; } if (txq > dev->real_num_tx_queues) { err = netif_set_real_num_tx_queues(dev, txq); if (err) goto undo_rx; } if (rxq < dev->real_num_rx_queues) WARN_ON(netif_set_real_num_rx_queues(dev, rxq)); if (txq < dev->real_num_tx_queues) WARN_ON(netif_set_real_num_tx_queues(dev, txq));
return 0;undo_rx: WARN_ON(netif_set_real_num_rx_queues(dev, old_rxq)); return err;}EXPORT_SYMBOL(netif_set_real_num_queues);
/** * netif_set_tso_max_size() - set the max size of TSO frames supported * @dev: netdev to update * @size: max skb->len of a TSO frame * * Set the limit on the size of TSO super-frames the device can handle. * Unless explicitly set the stack will assume the value of * %GSO_LEGACY_MAX_SIZE. */void netif_set_tso_max_size(struct net_device *dev, unsigned int size){ dev->tso_max_size = min(GSO_MAX_SIZE, size); if (size < READ_ONCE(dev->gso_max_size)) netif_set_gso_max_size(dev, size); if (size < READ_ONCE(dev->gso_ipv4_max_size)) netif_set_gso_ipv4_max_size(dev, size);}EXPORT_SYMBOL(netif_set_tso_max_size);
/** * netif_set_tso_max_segs() - set the max number of segs supported for TSO * @dev: netdev to update * @segs: max number of TCP segments * * Set the limit on the number of TCP segments the device can generate from * a single TSO super-frame. * Unless explicitly set the stack will assume the value of %GSO_MAX_SEGS. */void netif_set_tso_max_segs(struct net_device *dev, unsigned int segs){ dev->tso_max_segs = segs; if (segs < READ_ONCE(dev->gso_max_segs)) netif_set_gso_max_segs(dev, segs);}EXPORT_SYMBOL(netif_set_tso_max_segs);
/** * netif_inherit_tso_max() - copy all TSO limits from a lower device to an upper * @to: netdev to update * @from: netdev from which to copy the limits */void netif_inherit_tso_max(struct net_device *to, const struct net_device *from){ netif_set_tso_max_size(to, from->tso_max_size); netif_set_tso_max_segs(to, from->tso_max_segs);}EXPORT_SYMBOL(netif_inherit_tso_max);
/** * netif_get_num_default_rss_queues - default number of RSS queues * * Default value is the number of physical cores if there are only 1 or 2, or * divided by 2 if there are more. */int netif_get_num_default_rss_queues(void){ cpumask_var_t cpus; int cpu, count = 0;
if (unlikely(is_kdump_kernel() || !zalloc_cpumask_var(&cpus, GFP_KERNEL))) return 1;
cpumask_copy(cpus, cpu_online_mask); for_each_cpu(cpu, cpus) { ++count; cpumask_andnot(cpus, cpus, topology_sibling_cpumask(cpu)); } free_cpumask_var(cpus);
return count > 2 ? DIV_ROUND_UP(count, 2) : count;}EXPORT_SYMBOL(netif_get_num_default_rss_queues);
static void __netif_reschedule(struct Qdisc *q){ struct softnet_data *sd; unsigned long flags;
local_irq_save(flags); sd = this_cpu_ptr(&softnet_data); q->next_sched = NULL; *sd->output_queue_tailp = q; sd->output_queue_tailp = &q->next_sched; raise_softirq_irqoff(NET_TX_SOFTIRQ); local_irq_restore(flags);}
void __netif_schedule(struct Qdisc *q){ /* If q->defer_list is not empty, at least one thread is * in __dev_xmit_skb() before llist_del_all(&q->defer_list). * This thread will attempt to run the queue. */ if (!llist_empty(&q->defer_list)) return;
if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) __netif_reschedule(q);}EXPORT_SYMBOL(__netif_schedule);
struct dev_kfree_skb_cb { enum skb_drop_reason reason;};
static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb){ return (struct dev_kfree_skb_cb *)skb->cb;}
void netif_schedule_queue(struct netdev_queue *txq){ rcu_read_lock(); if (!netif_xmit_stopped(txq)) { struct Qdisc *q = rcu_dereference(txq->qdisc);
__netif_schedule(q); } rcu_read_unlock();}EXPORT_SYMBOL(netif_schedule_queue);
void netif_tx_wake_queue(struct netdev_queue *dev_queue){ if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state)) { struct Qdisc *q;
rcu_read_lock(); q = rcu_dereference(dev_queue->qdisc); __netif_schedule(q); rcu_read_unlock(); }}EXPORT_SYMBOL(netif_tx_wake_queue);
void dev_kfree_skb_irq_reason(struct sk_buff *skb, enum skb_drop_reason reason){ unsigned long flags;
if (unlikely(!skb)) return;
if (likely(refcount_read(&skb->users) == 1)) { smp_rmb(); refcount_set(&skb->users, 0); } else if (likely(!refcount_dec_and_test(&skb->users))) { return; } get_kfree_skb_cb(skb)->reason = reason; local_irq_save(flags); skb->next = __this_cpu_read(softnet_data.completion_queue); __this_cpu_write(softnet_data.completion_queue, skb); raise_softirq_irqoff(NET_TX_SOFTIRQ); local_irq_restore(flags);}EXPORT_SYMBOL(dev_kfree_skb_irq_reason);
void dev_kfree_skb_any_reason(struct sk_buff *skb, enum skb_drop_reason reason){ if (in_hardirq() || irqs_disabled()) dev_kfree_skb_irq_reason(skb, reason); else kfree_skb_reason(skb, reason);}EXPORT_SYMBOL(dev_kfree_skb_any_reason);
/** * netif_device_detach - mark device as removed * @dev: network device * * Mark device as removed from system and therefore no longer available. */void netif_device_detach(struct net_device *dev){ if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && netif_running(dev)) { netif_tx_stop_all_queues(dev); }}EXPORT_SYMBOL(netif_device_detach);
/** * netif_device_attach - mark device as attached * @dev: network device * * Mark device as attached from system and restart if needed. */void netif_device_attach(struct net_device *dev){ if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && netif_running(dev)) { netif_tx_wake_all_queues(dev); netdev_watchdog_up(dev); }}EXPORT_SYMBOL(netif_device_attach);
/* * Returns a Tx hash based on the given packet descriptor a Tx queues' number * to be used as a distribution range. */static u16 skb_tx_hash(const struct net_device *dev, const struct net_device *sb_dev, struct sk_buff *skb){ u32 hash; u16 qoffset = 0; u16 qcount = dev->real_num_tx_queues;
if (READ_ONCE(dev->num_tc)) { u8 tc = netdev_get_prio_tc_map(dev, skb->priority); struct netdev_tc_txq res;
res.combined = READ_ONCE(sb_dev->tc_to_txq[tc].combined); qoffset = res.offset; qcount = res.count; if (unlikely(!qcount)) { net_warn_ratelimited("%s: invalid qcount, qoffset %u for tc %u\n", sb_dev->name, qoffset, tc); qoffset = 0; qcount = dev->real_num_tx_queues; } }
if (skb_rx_queue_recorded(skb)) { DEBUG_NET_WARN_ON_ONCE(qcount == 0); hash = skb_get_rx_queue(skb); if (hash >= qoffset) hash -= qoffset; while (unlikely(hash >= qcount)) hash -= qcount; return hash + qoffset; }
return (u16) reciprocal_scale(skb_get_hash(skb), qcount) + qoffset;}
void skb_warn_bad_offload(const struct sk_buff *skb){ static const netdev_features_t null_features; struct net_device *dev = skb->dev; const char *name = "";
if (!net_ratelimit()) return;
if (dev) { if (dev->dev.parent) name = dev_driver_string(dev->dev.parent); else name = netdev_name(dev); } skb_dump(KERN_WARNING, skb, false); WARN(1, "%s: caps=(%pNF, %pNF)\n", name, dev ? &dev->features : &null_features, skb->sk ? &skb->sk->sk_route_caps : &null_features);}
/* * Invalidate hardware checksum when packet is to be mangled, and * complete checksum manually on outgoing path. */int skb_checksum_help(struct sk_buff *skb){ __wsum csum; int ret = 0, offset;
if (skb->ip_summed == CHECKSUM_COMPLETE) goto out_set_summed;
if (unlikely(skb_is_gso(skb))) { skb_warn_bad_offload(skb); return -EINVAL; }
if (!skb_frags_readable(skb)) { return -EFAULT; }
/* Before computing a checksum, we should make sure no frag could * be modified by an external entity : checksum could be wrong. */ if (skb_has_shared_frag(skb)) { ret = __skb_linearize(skb); if (ret) goto out; }
offset = skb_checksum_start_offset(skb); ret = -EINVAL; if (unlikely(offset >= skb_headlen(skb))) { DO_ONCE_LITE(skb_dump, KERN_ERR, skb, false); WARN_ONCE(true, "offset (%d) >= skb_headlen() (%u)\n", offset, skb_headlen(skb)); goto out; } csum = skb_checksum(skb, offset, skb->len - offset, 0);
offset += skb->csum_offset; if (unlikely(offset + sizeof(__sum16) > skb_headlen(skb))) { DO_ONCE_LITE(skb_dump, KERN_ERR, skb, false); WARN_ONCE(true, "offset+2 (%zu) > skb_headlen() (%u)\n", offset + sizeof(__sum16), skb_headlen(skb)); goto out; } ret = skb_ensure_writable(skb, offset + sizeof(__sum16)); if (ret) goto out;
*(__sum16 *)(skb->data + offset) = csum_fold(csum) ?: CSUM_MANGLED_0;out_set_summed: skb->ip_summed = CHECKSUM_NONE;out: return ret;}EXPORT_SYMBOL(skb_checksum_help);
#ifdef CONFIG_NET_CRC32Cint skb_crc32c_csum_help(struct sk_buff *skb){ u32 crc; int ret = 0, offset, start;
if (skb->ip_summed != CHECKSUM_PARTIAL) goto out;
if (unlikely(skb_is_gso(skb))) goto out;
/* Before computing a checksum, we should make sure no frag could * be modified by an external entity : checksum could be wrong. */ if (unlikely(skb_has_shared_frag(skb))) { ret = __skb_linearize(skb); if (ret) goto out; } start = skb_checksum_start_offset(skb); offset = start + offsetof(struct sctphdr, checksum); if (WARN_ON_ONCE(offset >= skb_headlen(skb))) { ret = -EINVAL; goto out; }
ret = skb_ensure_writable(skb, offset + sizeof(__le32)); if (ret) goto out;
crc = ~skb_crc32c(skb, start, skb->len - start, ~0); *(__le32 *)(skb->data + offset) = cpu_to_le32(crc); skb_reset_csum_not_inet(skb);out: return ret;}EXPORT_SYMBOL(skb_crc32c_csum_help);#endif /* CONFIG_NET_CRC32C */
__be16 skb_network_protocol(struct sk_buff *skb, int *depth){ __be16 type = skb->protocol;
/* Tunnel gso handlers can set protocol to ethernet. */ if (type == htons(ETH_P_TEB)) { struct ethhdr *eth;
if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) return 0;
eth = (struct ethhdr *)skb->data; type = eth->h_proto; }
return vlan_get_protocol_and_depth(skb, type, depth);}
/* Take action when hardware reception checksum errors are detected. */#ifdef CONFIG_BUGstatic void do_netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb){ netdev_err(dev, "hw csum failure\n"); skb_dump(KERN_ERR, skb, true); dump_stack();}
void netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb){ DO_ONCE_LITE(do_netdev_rx_csum_fault, dev, skb);}EXPORT_SYMBOL(netdev_rx_csum_fault);#endif
/* XXX: check that highmem exists at all on the given machine. */static int illegal_highdma(struct net_device *dev, struct sk_buff *skb){#ifdef CONFIG_HIGHMEM int i;
if (!(dev->features & NETIF_F_HIGHDMA)) { for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; struct page *page = skb_frag_page(frag);
if (page && PageHighMem(page)) return 1; } }#endif return 0;}
/* If MPLS offload request, verify we are testing hardware MPLS features * instead of standard features for the netdev. */#if IS_ENABLED(CONFIG_NET_MPLS_GSO)static netdev_features_t net_mpls_features(struct sk_buff *skb, netdev_features_t features, __be16 type){ if (eth_p_mpls(type)) features &= skb->dev->mpls_features;
return features;}#elsestatic netdev_features_t net_mpls_features(struct sk_buff *skb, netdev_features_t features, __be16 type){ return features;}#endif
static netdev_features_t harmonize_features(struct sk_buff *skb, netdev_features_t features){ __be16 type;
type = skb_network_protocol(skb, NULL); features = net_mpls_features(skb, features, type);
if (skb->ip_summed != CHECKSUM_NONE && !can_checksum_protocol(features, type)) { features &= ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); } if (illegal_highdma(skb->dev, skb)) features &= ~NETIF_F_SG;
return features;}
netdev_features_t passthru_features_check(struct sk_buff *skb, struct net_device *dev, netdev_features_t features){ return features;}EXPORT_SYMBOL(passthru_features_check);
static netdev_features_t dflt_features_check(struct sk_buff *skb, struct net_device *dev, netdev_features_t features){ return vlan_features_check(skb, features);}
static bool __skb_has_ipv6_ext_hdr(const struct sk_buff *skb, int nhoff){ const struct ipv6hdr *ip6h; struct ipv6hdr _ip6h;
ip6h = skb_header_pointer(skb, nhoff, sizeof(_ip6h), &_ip6h); return ip6h && ip6h->version == 6 && ipv6_ext_hdr(ip6h->nexthdr);}
static bool skb_has_ipv6_extension_hdr(const struct sk_buff *skb){ if (vlan_get_protocol(skb) == htons(ETH_P_IPV6)) { if (__skb_has_ipv6_ext_hdr(skb, skb_network_offset(skb))) return true;
/* Catch tunnels without skb->encapsulation (e.g., virtio). */ if (!skb->encapsulation && skb_transport_header_was_set(skb) && skb_network_header_len(skb) != sizeof(struct ipv6hdr)) return true; }
/* Tunnels without an inner network header, such as SCTP-in-UDP or * PSP, have no inner IP header and thus no inner extension header. */ if (skb->encapsulation && skb_inner_network_header_was_set(skb) && __skb_has_ipv6_ext_hdr(skb, skb_inner_network_offset(skb))) return true;
return false;}
static netdev_features_t gso_features_check(const struct sk_buff *skb, struct net_device *dev, netdev_features_t features){ u16 gso_segs = skb_shinfo(skb)->gso_segs;
if (gso_segs > READ_ONCE(dev->gso_max_segs)) return features & ~NETIF_F_GSO_MASK;
if (unlikely(skb->len >= netif_get_gso_max_size(dev, skb))) return features & ~NETIF_F_GSO_MASK;
if (!skb_shinfo(skb)->gso_type) { skb_warn_bad_offload(skb); return features & ~NETIF_F_GSO_MASK; }
/* Support for GSO partial features requires software * intervention before we can actually process the packets * so we need to strip support for any partial features now * and we can pull them back in after we have partially * segmented the frame. */ if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL)) features &= ~dev->gso_partial_features;
/* Make sure to clear the IPv4 ID mangling feature if the IPv4 header * has the potential to be fragmented so that TSO does not generate * segments with the same ID. For encapsulated packets, the ID mangling * feature is guaranteed not to use the same ID for the outer IPv4 * headers of the generated segments if the headers have the potential * to be fragmented, so there is no need to clear the IPv4 ID mangling * feature (see the section about NETIF_F_TSO_MANGLEID in * segmentation-offloads.rst). */ if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) { const struct iphdr *iph; struct iphdr _iph; int nhoff = skb->encapsulation ? skb_inner_network_offset(skb) : skb_network_offset(skb);
iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph);
if (!iph || !(iph->frag_off & htons(IP_DF))) features &= ~dev->mangleid_features; }
/* NETIF_F_IPV6_CSUM does not support IPv6 extension headers, * so neither does TSO that depends on it. */ if (features & NETIF_F_IPV6_CSUM && skb_has_ipv6_extension_hdr(skb)) features &= ~(NETIF_F_IPV6_CSUM | NETIF_F_TSO6 | NETIF_F_GSO_UDP_L4);
return features;}
netdev_features_t netif_skb_features(struct sk_buff *skb){ struct net_device *dev = skb->dev; netdev_features_t features = dev->features;
if (skb_is_gso(skb)) features = gso_features_check(skb, dev, features);
/* If encapsulation offload request, verify we are testing * hardware encapsulation features instead of standard * features for the netdev */ if (skb->encapsulation) features &= dev->hw_enc_features;
if (skb_vlan_tagged(skb)) features = netdev_intersect_features(features, dev->vlan_features | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX);
if (dev->netdev_ops->ndo_features_check) features &= dev->netdev_ops->ndo_features_check(skb, dev, features); else features &= dflt_features_check(skb, dev, features);
return harmonize_features(skb, features);}EXPORT_SYMBOL(netif_skb_features);
static int xmit_one(struct sk_buff *skb, struct net_device *dev, struct netdev_queue *txq, bool more){ unsigned int len; int rc;
if (dev_nit_active_rcu(dev)) dev_queue_xmit_nit(skb, dev);
len = skb->len; trace_net_dev_start_xmit(skb, dev); rc = netdev_start_xmit(skb, dev, txq, more); trace_net_dev_xmit(skb, rc, dev, len);
return rc;}
struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *dev, struct netdev_queue *txq, int *ret){ struct sk_buff *skb = first; int rc = NETDEV_TX_OK;
while (skb) { struct sk_buff *next = skb->next;
skb_mark_not_on_list(skb); rc = xmit_one(skb, dev, txq, next != NULL); if (unlikely(!dev_xmit_complete(rc))) { skb->next = next; goto out; }
skb = next; if (netif_tx_queue_stopped(txq) && skb) { rc = NETDEV_TX_BUSY; break; } }
out: *ret = rc; return skb;}
static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb, netdev_features_t features){ if (skb_vlan_tag_present(skb) && !vlan_hw_offload_capable(features, skb->vlan_proto)) skb = __vlan_hwaccel_push_inside(skb); return skb;}
int skb_csum_hwoffload_help(struct sk_buff *skb, const netdev_features_t features){ if (unlikely(skb_csum_is_sctp(skb))) return !!(features & NETIF_F_SCTP_CRC) ? 0 : skb_crc32c_csum_help(skb);
if (features & NETIF_F_HW_CSUM) return 0;
if (features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) { if (skb_has_ipv6_extension_hdr(skb)) goto sw_checksum;
switch (skb->csum_offset) { case offsetof(struct tcphdr, check): case offsetof(struct udphdr, check): return 0; } }
sw_checksum: return skb_checksum_help(skb);}EXPORT_SYMBOL(skb_csum_hwoffload_help);
/* Checks if this SKB belongs to an HW offloaded socket * and whether any SW fallbacks are required based on dev. * Check decrypted mark in case skb_orphan() cleared socket. */static struct sk_buff *sk_validate_xmit_skb(struct sk_buff *skb, struct net_device *dev){#ifdef CONFIG_SOCK_VALIDATE_XMIT struct sk_buff *(*sk_validate)(struct sock *sk, struct net_device *dev, struct sk_buff *skb); struct sock *sk = skb->sk;
sk_validate = NULL; if (sk) { if (sk_fullsock(sk)) sk_validate = sk->sk_validate_xmit_skb; else if (sk_is_inet(sk) && sk->sk_state == TCP_TIME_WAIT) sk_validate = inet_twsk(sk)->tw_validate_xmit_skb; }
if (sk_validate) { skb = sk_validate(sk, dev, skb); } else if (unlikely(skb_is_decrypted(skb))) { pr_warn_ratelimited("unencrypted skb with no associated socket - dropping\n"); kfree_skb(skb); skb = NULL; }#endif
return skb;}
static struct sk_buff *validate_xmit_unreadable_skb(struct sk_buff *skb, struct net_device *dev){ struct skb_shared_info *shinfo; struct net_iov *niov;
if (likely(skb_frags_readable(skb) || dev->netmem_tx == NETMEM_TX_NO_DMA)) goto out;
if (dev->netmem_tx == NETMEM_TX_NONE) goto out_free;
shinfo = skb_shinfo(skb);
if (shinfo->nr_frags > 0) { niov = netmem_to_net_iov(skb_frag_netmem(&shinfo->frags[0])); if (net_is_devmem_iov(niov) && READ_ONCE(net_devmem_iov_binding(niov)->dev) != dev) goto out_free; }
out: return skb;
out_free: kfree_skb(skb); return NULL;}
/* Returns the skb on success, NULL if dropped, or ERR_PTR(-EINPROGRESS) * if stolen by async xfrm crypto (delivered via xfrm_dev_resume()). */static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev, bool *again){ netdev_features_t features;
skb = validate_xmit_unreadable_skb(skb, dev); if (unlikely(!skb)) goto out_null;
features = netif_skb_features(skb); skb = validate_xmit_vlan(skb, features); if (unlikely(!skb)) goto out_null;
skb = sk_validate_xmit_skb(skb, dev); if (unlikely(!skb)) goto out_null;
if (netif_needs_gso(skb, features)) { struct sk_buff *segs;
segs = skb_gso_segment(skb, features); if (IS_ERR(segs)) { goto out_kfree_skb; } else if (segs) { consume_skb(skb); skb = segs; } } else { if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) goto out_kfree_skb;
/* If packet is not checksummed and device does not * support checksumming for this protocol, complete * checksumming here. */ if (skb->ip_summed == CHECKSUM_PARTIAL) { if (skb->encapsulation) skb_set_inner_transport_header(skb, skb_checksum_start_offset(skb)); else skb_set_transport_header(skb, skb_checksum_start_offset(skb)); if (skb_csum_hwoffload_help(skb, features)) goto out_kfree_skb; } }
skb = validate_xmit_xfrm(skb, features, again);
return skb;
out_kfree_skb: kfree_skb(skb);out_null: dev_core_stats_tx_dropped_inc(dev); return NULL;}
struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again){ struct sk_buff *next, *head = NULL, *tail;
for (; skb != NULL; skb = next) { next = skb->next; skb_mark_not_on_list(skb);
/* in case skb won't be segmented, point to itself */ skb->prev = skb;
skb = validate_xmit_skb(skb, dev, again); if (IS_ERR_OR_NULL(skb)) continue;
if (!head) head = skb; else tail->next = skb; /* If skb was segmented, skb->prev points to * the last segment. If not, it still contains skb. */ tail = skb->prev; } return head;}EXPORT_SYMBOL_GPL(validate_xmit_skb_list);
static enum skb_drop_reason qdisc_pkt_len_segs_init(struct sk_buff *skb){ struct skb_shared_info *shinfo = skb_shinfo(skb); unsigned int hdr_len, tlen; u16 gso_segs;
qdisc_skb_cb(skb)->pkt_len = skb->len; if (!shinfo->gso_size) { qdisc_skb_cb(skb)->pkt_segs = 1; return SKB_NOT_DROPPED_YET; }
qdisc_skb_cb(skb)->pkt_segs = gso_segs = shinfo->gso_segs;
/* To get more precise estimation of bytes sent on wire, * we add to pkt_len the headers size of all segments */
/* mac layer + network layer */ if (!skb->encapsulation) { if (unlikely(!skb_transport_header_was_set(skb))) return SKB_NOT_DROPPED_YET; hdr_len = skb_transport_offset(skb); } else { hdr_len = skb_inner_transport_offset(skb); } /* + transport layer */ if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) { const struct tcphdr *th;
if (!pskb_may_pull(skb, hdr_len + sizeof(struct tcphdr))) return SKB_DROP_REASON_SKB_BAD_GSO;
th = (const struct tcphdr *)(skb->data + hdr_len); tlen = __tcp_hdrlen(th); if (tlen < sizeof(*th)) return SKB_DROP_REASON_SKB_BAD_GSO; hdr_len += tlen; if (!pskb_may_pull(skb, hdr_len)) return SKB_DROP_REASON_SKB_BAD_GSO; } else if (shinfo->gso_type & SKB_GSO_UDP_L4) { if (!pskb_may_pull(skb, hdr_len + sizeof(struct udphdr))) return SKB_DROP_REASON_SKB_BAD_GSO; hdr_len += sizeof(struct udphdr); }
/* prior pskb_may_pull() might have changed skb->head. */ shinfo = skb_shinfo(skb); if (unlikely(shinfo->gso_type & SKB_GSO_DODGY)) { int payload = skb->len - hdr_len;
/* Malicious packet. */ if (payload <= 0) return SKB_DROP_REASON_SKB_BAD_GSO; gso_segs = DIV_ROUND_UP(payload, shinfo->gso_size); shinfo->gso_segs = gso_segs; qdisc_skb_cb(skb)->pkt_segs = gso_segs; } qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len; return SKB_NOT_DROPPED_YET;}
static int dev_qdisc_enqueue(struct sk_buff *skb, struct Qdisc *q, struct sk_buff **to_free, struct netdev_queue *txq){ int rc;
rc = q->enqueue(skb, q, to_free) & NET_XMIT_MASK; if (rc == NET_XMIT_SUCCESS) trace_qdisc_enqueue(q, txq, skb); return rc;}
static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, struct net_device *dev, struct netdev_queue *txq){ struct sk_buff *next, *to_free = NULL, *to_free2 = NULL; spinlock_t *root_lock = qdisc_lock(q); struct llist_node *ll_list, *first_n; unsigned long defer_count = 0; int rc;
qdisc_calculate_pkt_len(skb, q);
tcf_set_qdisc_drop_reason(skb, QDISC_DROP_GENERIC);
if (q->flags & TCQ_F_NOLOCK) { if (q->flags & TCQ_F_CAN_BYPASS && nolock_qdisc_is_empty(q) && qdisc_run_begin(q)) { /* Retest nolock_qdisc_is_empty() within the protection * of q->seqlock to protect from racing with requeuing. */ if (unlikely(!nolock_qdisc_is_empty(q))) { rc = dev_qdisc_enqueue(skb, q, &to_free, txq); __qdisc_run(q); to_free2 = qdisc_run_end(q);
goto free_skbs; }
qdisc_bstats_cpu_update(q, skb); if (sch_direct_xmit(skb, q, dev, txq, NULL, true) && !nolock_qdisc_is_empty(q)) __qdisc_run(q);
to_free2 = qdisc_run_end(q); rc = NET_XMIT_SUCCESS; goto free_skbs; }
rc = dev_qdisc_enqueue(skb, q, &to_free, txq); to_free2 = qdisc_run(q); goto free_skbs; }
/* Open code llist_add(&skb->ll_node, &q->defer_list) + queue limit. * In the try_cmpxchg() loop, we want to increment q->defer_count * at most once to limit the number of skbs in defer_list. * We perform the defer_count increment only if the list is not empty, * because some arches have slow atomic_long_inc_return(). */ first_n = READ_ONCE(q->defer_list.first); do { if (first_n && !defer_count) { defer_count = atomic_long_inc_return(&q->defer_count); if (unlikely(defer_count > READ_ONCE(net_hotdata.qdisc_max_burst))) { kfree_skb_reason(skb, SKB_DROP_REASON_QDISC_BURST_DROP); return NET_XMIT_DROP; } } skb->ll_node.next = first_n; } while (!try_cmpxchg(&q->defer_list.first, &first_n, &skb->ll_node));
/* If defer_list was not empty, we know the cpu which queued * the first skb will process the whole list for us. */ if (first_n) return NET_XMIT_SUCCESS;
spin_lock(root_lock);
ll_list = llist_del_all(&q->defer_list); /* There is a small race because we clear defer_count not atomically * with the prior llist_del_all(). This means defer_list could grow * over qdisc_max_burst. */ atomic_long_set(&q->defer_count, 0);
ll_list = llist_reverse_order(ll_list);
if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { llist_for_each_entry_safe(skb, next, ll_list, ll_node) __qdisc_drop(skb, &to_free); rc = NET_XMIT_DROP; goto unlock; } if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && !llist_next(ll_list) && qdisc_run_begin(q)) { /* * This is a work-conserving queue; there are no old skbs * waiting to be sent out; and the qdisc is not running - * xmit the skb directly. */
DEBUG_NET_WARN_ON_ONCE(skb != llist_entry(ll_list, struct sk_buff, ll_node)); qdisc_bstats_update(q, skb); if (sch_direct_xmit(skb, q, dev, txq, root_lock, true)) __qdisc_run(q); to_free2 = qdisc_run_end(q); rc = NET_XMIT_SUCCESS; } else { int count = 0;
llist_for_each_entry_safe(skb, next, ll_list, ll_node) { if (next) { prefetch(next); prefetch(&next->priority); skb_mark_not_on_list(skb); } rc = dev_qdisc_enqueue(skb, q, &to_free, txq); count++; } to_free2 = qdisc_run(q); if (count != 1) rc = NET_XMIT_SUCCESS; }unlock: spin_unlock(root_lock);
free_skbs: tcf_kfree_skb_list(to_free, q, txq, dev); tcf_kfree_skb_list(to_free2, q, txq, dev); return rc;}
#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)static void skb_update_prio(struct sk_buff *skb){ const struct netprio_map *map; const struct sock *sk; unsigned int prioidx;
if (skb->priority) return; map = rcu_dereference_bh(skb->dev->priomap); if (!map) return; sk = skb_to_full_sk(skb); if (!sk) return;
prioidx = sock_cgroup_prioidx(&sk->sk_cgrp_data);
if (prioidx < map->priomap_len) skb->priority = map->priomap[prioidx];}#else#define skb_update_prio(skb)#endif
/** * dev_loopback_xmit - loop back @skb * @net: network namespace this loopback is happening in * @sk: sk needed to be a netfilter okfn * @skb: buffer to transmit */int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *skb){ skb_reset_mac_header(skb); __skb_pull(skb, skb_network_offset(skb)); skb->pkt_type = PACKET_LOOPBACK; if (skb->ip_summed == CHECKSUM_NONE) skb->ip_summed = CHECKSUM_UNNECESSARY; DEBUG_NET_WARN_ON_ONCE(!skb_dst(skb)); skb_dst_force(skb); netif_rx(skb); return 0;}EXPORT_SYMBOL(dev_loopback_xmit);
#ifdef CONFIG_NET_EGRESSstatic struct netdev_queue *netdev_tx_queue_mapping(struct net_device *dev, struct sk_buff *skb){ int queue = skb_get_queue_mapping(skb); int capped;
capped = netdev_cap_txqueue(dev, queue); if (unlikely(capped != queue)) skb_set_queue_mapping(skb, capped);
return netdev_get_tx_queue(dev, capped);}
#ifndef CONFIG_PREEMPT_RTstatic bool netdev_xmit_txqueue_skipped(void){ return __this_cpu_read(softnet_data.xmit.skip_txqueue);}
bool netdev_xmit_skip_txqueue(bool skip){ bool prev = netdev_xmit_txqueue_skipped();
__this_cpu_write(softnet_data.xmit.skip_txqueue, skip);
return prev;}EXPORT_SYMBOL_GPL(netdev_xmit_skip_txqueue);
#elsestatic bool netdev_xmit_txqueue_skipped(void){ return current->net_xmit.skip_txqueue;}
bool netdev_xmit_skip_txqueue(bool skip){ bool prev = netdev_xmit_txqueue_skipped();
current->net_xmit.skip_txqueue = skip;
return prev;}EXPORT_SYMBOL_GPL(netdev_xmit_skip_txqueue);#endif#endif /* CONFIG_NET_EGRESS */
#ifdef CONFIG_NET_XGRESSstatic int tc_run(struct tcx_entry *entry, struct sk_buff *skb, enum skb_drop_reason *drop_reason){ int ret = TC_ACT_UNSPEC;#ifdef CONFIG_NET_CLS_ACT struct mini_Qdisc *miniq = rcu_dereference_bh(entry->miniq); struct tcf_result res;
if (!miniq) return ret;
/* Global bypass */ if (!static_branch_likely(&tcf_sw_enabled_key)) return ret;
/* Block-wise bypass */ if (tcf_block_bypass_sw(miniq->block)) return ret;
tc_skb_cb(skb)->mru = 0; qdisc_skb_cb(skb)->post_ct = false; tcf_set_drop_reason(skb, *drop_reason);
mini_qdisc_bstats_cpu_update(miniq, skb); ret = tcf_classify(skb, miniq->block, miniq->filter_list, &res, false); /* Only tcf related quirks below. */ switch (ret) { case TC_ACT_SHOT: *drop_reason = tcf_get_drop_reason(skb); mini_qdisc_qstats_cpu_drop(miniq); break; case TC_ACT_OK: case TC_ACT_RECLASSIFY: skb->tc_index = TC_H_MIN(res.classid); break; }#endif /* CONFIG_NET_CLS_ACT */ return ret;}
static DEFINE_STATIC_KEY_FALSE(tcx_needed_key);
void tcx_inc(void){ static_branch_inc(&tcx_needed_key);}
void tcx_dec(void){ static_branch_dec(&tcx_needed_key);}
static __always_inline enum tcx_action_basetcx_run(const struct bpf_mprog_entry *entry, struct sk_buff *skb, const bool needs_mac){ const struct bpf_mprog_fp *fp; const struct bpf_prog *prog; int ret = TCX_NEXT;
if (needs_mac) __skb_push(skb, skb->mac_len); bpf_mprog_foreach_prog(entry, fp, prog) { bpf_compute_data_pointers(skb); ret = bpf_prog_run(prog, skb); if (ret != TCX_NEXT) break; } if (needs_mac) __skb_pull(skb, skb->mac_len); return tcx_action_code(skb, ret);}
static __always_inline struct sk_buff *sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret, struct net_device *orig_dev, bool *another){ struct bpf_mprog_entry *entry = rcu_dereference_bh(skb->dev->tcx_ingress); enum skb_drop_reason drop_reason = SKB_DROP_REASON_TC_INGRESS; struct bpf_net_context __bpf_net_ctx, *bpf_net_ctx; int sch_ret;
if (!entry) return skb;
bpf_net_ctx = bpf_net_ctx_set(&__bpf_net_ctx); if (unlikely(*pt_prev)) { *ret = deliver_skb(skb, *pt_prev, orig_dev); *pt_prev = NULL; }
qdisc_pkt_len_segs_init(skb); tcx_set_ingress(skb, true);
if (static_branch_unlikely(&tcx_needed_key)) { sch_ret = tcx_run(entry, skb, true); if (sch_ret != TC_ACT_UNSPEC) goto ingress_verdict; } sch_ret = tc_run(tcx_entry(entry), skb, &drop_reason);ingress_verdict: switch (sch_ret) { case TC_ACT_REDIRECT: /* skb_mac_header check was done by BPF, so we can safely * push the L2 header back before redirecting to another * netdev. */ __skb_push(skb, skb->mac_len); if (skb_do_redirect(skb) == -EAGAIN) { __skb_pull(skb, skb->mac_len); *another = true; break; } *ret = NET_RX_SUCCESS; bpf_net_ctx_clear(bpf_net_ctx); return NULL; case TC_ACT_SHOT: kfree_skb_reason(skb, drop_reason); *ret = NET_RX_DROP; bpf_net_ctx_clear(bpf_net_ctx); return NULL; /* used by tc_run */ case TC_ACT_STOLEN: case TC_ACT_QUEUED: case TC_ACT_TRAP: consume_skb(skb); fallthrough; case TC_ACT_CONSUMED: *ret = NET_RX_SUCCESS; bpf_net_ctx_clear(bpf_net_ctx); return NULL; } bpf_net_ctx_clear(bpf_net_ctx);
return skb;}
static __always_inline struct sk_buff *sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev){ struct bpf_mprog_entry *entry = rcu_dereference_bh(dev->tcx_egress); enum skb_drop_reason drop_reason = SKB_DROP_REASON_TC_EGRESS; struct bpf_net_context __bpf_net_ctx, *bpf_net_ctx; int sch_ret;
if (!entry) return skb;
bpf_net_ctx = bpf_net_ctx_set(&__bpf_net_ctx);
/* qdisc_skb_cb(skb)->pkt_len & tcx_set_ingress() was * already set by the caller. */ if (static_branch_unlikely(&tcx_needed_key)) { sch_ret = tcx_run(entry, skb, false); if (sch_ret != TC_ACT_UNSPEC) goto egress_verdict; } sch_ret = tc_run(tcx_entry(entry), skb, &drop_reason);egress_verdict: switch (sch_ret) { case TC_ACT_REDIRECT: /* No need to push/pop skb's mac_header here on egress! */ skb_do_redirect(skb); *ret = NET_XMIT_SUCCESS; bpf_net_ctx_clear(bpf_net_ctx); return NULL; case TC_ACT_SHOT: kfree_skb_reason(skb, drop_reason); *ret = NET_XMIT_DROP; bpf_net_ctx_clear(bpf_net_ctx); return NULL; /* used by tc_run */ case TC_ACT_STOLEN: case TC_ACT_QUEUED: case TC_ACT_TRAP: consume_skb(skb); fallthrough; case TC_ACT_CONSUMED: *ret = NET_XMIT_SUCCESS; bpf_net_ctx_clear(bpf_net_ctx); return NULL; } bpf_net_ctx_clear(bpf_net_ctx);
return skb;}#elsestatic __always_inline struct sk_buff *sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret, struct net_device *orig_dev, bool *another){ return skb;}
static __always_inline struct sk_buff *sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev){ return skb;}#endif /* CONFIG_NET_XGRESS */
#ifdef CONFIG_XPSstatic int __get_xps_queue_idx(struct net_device *dev, struct sk_buff *skb, struct xps_dev_maps *dev_maps, unsigned int tci){ int tc = netdev_get_prio_tc_map(dev, skb->priority); struct xps_map *map; int queue_index = -1;
if (tc >= dev_maps->num_tc || tci >= dev_maps->nr_ids) return queue_index;
tci *= dev_maps->num_tc; tci += tc;
map = rcu_dereference(dev_maps->attr_map[tci]); if (map) { if (map->len == 1) queue_index = map->queues[0]; else queue_index = map->queues[reciprocal_scale( skb_get_hash(skb), map->len)]; if (unlikely(queue_index >= dev->real_num_tx_queues)) queue_index = -1; } return queue_index;}#endif
static int get_xps_queue(struct net_device *dev, struct net_device *sb_dev, struct sk_buff *skb){#ifdef CONFIG_XPS struct xps_dev_maps *dev_maps; struct sock *sk = skb->sk; int queue_index = -1;
if (!static_key_false(&xps_needed)) return -1;
rcu_read_lock(); if (!static_key_false(&xps_rxqs_needed)) goto get_cpus_map;
dev_maps = rcu_dereference(sb_dev->xps_maps[XPS_RXQS]); if (dev_maps) { int tci = sk_rx_queue_get(sk);
if (tci >= 0) queue_index = __get_xps_queue_idx(dev, skb, dev_maps, tci); }
get_cpus_map: if (queue_index < 0) { dev_maps = rcu_dereference(sb_dev->xps_maps[XPS_CPUS]); if (dev_maps) { unsigned int tci = skb->sender_cpu - 1;
queue_index = __get_xps_queue_idx(dev, skb, dev_maps, tci); } } rcu_read_unlock();
return queue_index;#else return -1;#endif}
u16 dev_pick_tx_zero(struct net_device *dev, struct sk_buff *skb, struct net_device *sb_dev){ return 0;}EXPORT_SYMBOL(dev_pick_tx_zero);
int sk_tx_queue_get(const struct sock *sk){ int resel, val;
if (!sk) return -1; /* Paired with WRITE_ONCE() in sk_tx_queue_clear() * and sk_tx_queue_set(). */ val = READ_ONCE(sk->sk_tx_queue_mapping);
if (val == NO_QUEUE_MAPPING) return -1;
if (!sk_fullsock(sk)) return val;
resel = READ_ONCE(sock_net(sk)->core.sysctl_txq_reselection); if (resel && time_is_before_jiffies( READ_ONCE(sk->sk_tx_queue_mapping_jiffies) + resel)) return -1;
return val;}EXPORT_SYMBOL(sk_tx_queue_get);
u16 netdev_pick_tx(struct net_device *dev, struct sk_buff *skb, struct net_device *sb_dev){ struct sock *sk = skb->sk; int queue_index = sk_tx_queue_get(sk);
sb_dev = sb_dev ? : dev;
if (queue_index < 0 || skb->ooo_okay || queue_index >= dev->real_num_tx_queues) { int new_index = get_xps_queue(dev, sb_dev, skb);
if (new_index < 0) new_index = skb_tx_hash(dev, sb_dev, skb);
if (sk && sk_fullsock(sk) && rcu_access_pointer(sk->sk_dst_cache)) sk_tx_queue_set(sk, new_index);
queue_index = new_index; }
return queue_index;}EXPORT_SYMBOL(netdev_pick_tx);
struct netdev_queue *netdev_core_pick_tx(struct net_device *dev, struct sk_buff *skb, struct net_device *sb_dev){ int queue_index = 0;
#ifdef CONFIG_XPS u32 sender_cpu = skb->sender_cpu - 1;
if (sender_cpu >= (u32)NR_CPUS) skb->sender_cpu = raw_smp_processor_id() + 1;#endif
if (dev->real_num_tx_queues != 1) { const struct net_device_ops *ops = dev->netdev_ops;
if (ops->ndo_select_queue) queue_index = ops->ndo_select_queue(dev, skb, sb_dev); else queue_index = netdev_pick_tx(dev, skb, sb_dev);
queue_index = netdev_cap_txqueue(dev, queue_index); }
skb_set_queue_mapping(skb, queue_index); return netdev_get_tx_queue(dev, queue_index);}
/** * __dev_queue_xmit() - transmit a buffer * @skb: buffer to transmit * @sb_dev: suboordinate device used for L2 forwarding offload * * Queue a buffer for transmission to a network device. The caller must * have set the device and priority and built the buffer before calling * this function. The function can be called from an interrupt. * * When calling this method, interrupts MUST be enabled. This is because * the BH enable code must have IRQs enabled so that it will not deadlock. * * Regardless of the return value, the skb is consumed, so it is currently * difficult to retry a send to this method. (You can bump the ref count * before sending to hold a reference for retry if you are careful.) * * Return: * * 0 - buffer successfully transmitted * * positive qdisc return code - NET_XMIT_DROP etc. * * negative errno - other errors */int __dev_queue_xmit(struct sk_buff *skb, struct net_device *sb_dev){ struct net_device *dev = skb->dev; struct netdev_queue *txq = NULL; enum skb_drop_reason reason; int cpu, rc = -ENOMEM; bool again = false; struct Qdisc *q;
skb_reset_mac_header(skb); skb_assert_len(skb);
if (unlikely(skb_shinfo(skb)->tx_flags & (SKBTX_SCHED_TSTAMP | SKBTX_BPF))) __skb_tstamp_tx(skb, NULL, NULL, skb->sk, SCM_TSTAMP_SCHED);
reason = qdisc_pkt_len_segs_init(skb); if (unlikely(reason)) { dev_core_stats_tx_dropped_inc(dev); kfree_skb_reason(skb, reason); return -EINVAL; } /* Disable soft irqs for various locks below. Also * stops preemption for RCU. */ rcu_read_lock_bh();
skb_update_prio(skb);
tcx_set_ingress(skb, false);#ifdef CONFIG_NET_EGRESS if (static_branch_unlikely(&egress_needed_key)) { bool skip_txq;
if (nf_hook_egress_active()) { skb = nf_hook_egress(skb, &rc, dev); if (!skb) goto out; }
skip_txq = netdev_xmit_skip_txqueue(false);
nf_skip_egress(skb, true); skb = sch_handle_egress(skb, &rc, dev); if (!skb) { netdev_xmit_skip_txqueue(skip_txq); goto out; } nf_skip_egress(skb, false);
if (netdev_xmit_skip_txqueue(skip_txq)) txq = netdev_tx_queue_mapping(dev, skb); }#endif /* If device/qdisc don't need skb->dst, release it right now while * its hot in this cpu cache. */ if (dev->priv_flags & IFF_XMIT_DST_RELEASE) skb_dst_drop(skb); else skb_dst_force(skb);
if (!txq) txq = netdev_core_pick_tx(dev, skb, sb_dev);
q = rcu_dereference_bh(txq->qdisc);
trace_net_dev_queue(skb); if (q->enqueue) { rc = __dev_xmit_skb(skb, q, dev, txq); goto out; }
/* The device has no queue. Common case for software devices: * loopback, all the sorts of tunnels...
* Really, it is unlikely that netif_tx_lock protection is necessary * here. (f.e. loopback and IP tunnels are clean ignoring statistics * counters.) * However, it is possible, that they rely on protection * made by us here.
* Check this and shot the lock. It is not prone from deadlocks. *Either shot noqueue qdisc, it is even simpler 8) */ if (unlikely(!(dev->flags & IFF_UP))) { reason = SKB_DROP_REASON_DEV_READY; goto drop; }
cpu = smp_processor_id(); /* ok because BHs are off */
if (likely(!netif_tx_owned(txq, cpu))) { bool is_list = false;
if (dev_xmit_recursion()) goto recursion_alert;
skb = validate_xmit_skb(skb, dev, &again); if (IS_ERR_OR_NULL(skb)) { if (PTR_ERR(skb) == -EINPROGRESS) rc = NET_XMIT_SUCCESS; goto out; }
HARD_TX_LOCK(dev, txq, cpu);
if (!netif_xmit_stopped(txq)) { is_list = !!skb->next;
dev_xmit_recursion_inc(); skb = dev_hard_start_xmit(skb, dev, txq, &rc); dev_xmit_recursion_dec();
/* GSO segments a single SKB into a list of frames. * TCP expects error to mean none of the data was sent. */ if (is_list) rc = NETDEV_TX_OK; } HARD_TX_UNLOCK(dev, txq); if (!skb) /* xmit completed */ goto out;
net_crit_ratelimited("Virtual device %s asks to queue packet!\n", dev->name); /* NETDEV_TX_BUSY or queue was stopped */ if (!is_list) rc = -ENETDOWN; } else { /* Recursion is detected! It is possible unfortunately. */recursion_alert: net_crit_ratelimited("Dead loop on virtual device %s (net %llu), fix it urgently!\n", dev->name, dev_net(dev)->net_cookie);
rc = -ENETDOWN; }
reason = SKB_DROP_REASON_RECURSION_LIMIT;drop: rcu_read_unlock_bh();
dev_core_stats_tx_dropped_inc(dev); kfree_skb_list_reason(skb, reason); return rc;out: rcu_read_unlock_bh(); return rc;}EXPORT_SYMBOL(__dev_queue_xmit);
int __dev_direct_xmit(struct sk_buff *skb, u16 queue_id){ struct net_device *dev = skb->dev; struct sk_buff *orig_skb = skb; struct netdev_queue *txq; int ret = NETDEV_TX_BUSY; bool again = false;
if (unlikely(!netif_running(dev) || !netif_carrier_ok(dev))) goto drop;
skb = validate_xmit_skb_list(skb, dev, &again); if (skb != orig_skb) goto drop;
skb_set_queue_mapping(skb, queue_id); txq = skb_get_tx_queue(dev, skb);
local_bh_disable();
dev_xmit_recursion_inc(); HARD_TX_LOCK(dev, txq, smp_processor_id()); if (!netif_xmit_frozen_or_drv_stopped(txq)) ret = netdev_start_xmit(skb, dev, txq, false); HARD_TX_UNLOCK(dev, txq); dev_xmit_recursion_dec();
local_bh_enable(); return ret;drop: dev_core_stats_tx_dropped_inc(dev); kfree_skb_list(skb); return NET_XMIT_DROP;}EXPORT_SYMBOL(__dev_direct_xmit);
/************************************************************************* * Receiver routines *************************************************************************/static DEFINE_PER_CPU(struct task_struct *, backlog_napi);
int weight_p __read_mostly = 64; /* old backlog weight */int dev_weight_rx_bias __read_mostly = 1; /* bias for backlog weight */int dev_weight_tx_bias __read_mostly = 1; /* bias for output_queue quota */
/* Called with irq disabled */static inline void ____napi_schedule(struct softnet_data *sd, struct napi_struct *napi){ struct task_struct *thread;
lockdep_assert_irqs_disabled();
if (test_bit(NAPI_STATE_THREADED, &napi->state)) { /* Paired with smp_mb__before_atomic() in * napi_enable()/netif_set_threaded(). * Use READ_ONCE() to guarantee a complete * read on napi->thread. Only call * wake_up_process() when it's not NULL. */ thread = READ_ONCE(napi->thread); if (thread) { if (use_backlog_threads() && thread == raw_cpu_read(backlog_napi)) goto use_local_napi;
set_bit(NAPI_STATE_SCHED_THREADED, &napi->state); wake_up_process(thread); return; } }
use_local_napi: DEBUG_NET_WARN_ON_ONCE(!list_empty(&napi->poll_list)); list_add_tail(&napi->poll_list, &sd->poll_list); WRITE_ONCE(napi->list_owner, smp_processor_id()); /* If not called from net_rx_action() * we have to raise NET_RX_SOFTIRQ. */ if (!sd->in_net_rx_action) raise_softirq_irqoff(NET_RX_SOFTIRQ);}
#ifdef CONFIG_RPS
struct static_key_false rps_needed __read_mostly;EXPORT_SYMBOL(rps_needed);struct static_key_false rfs_needed __read_mostly;EXPORT_SYMBOL(rfs_needed);
static u32 rfs_slot(u32 hash, rps_tag_ptr tag_ptr){ return hash_32(hash, rps_tag_to_log(tag_ptr));}
#ifdef CONFIG_RFS_ACCEL/** * rps_flow_is_active - check whether the flow is recently active. * @rflow: Specific flow to check activity. * @log: ilog2(hashsize). * @cpu: CPU saved in @rflow. * * If the CPU has processed many packets since the flow's last activity * (beyond 10 times the table size), the flow is considered stale. * * Return: true if flow was recently active. */static bool rps_flow_is_active(struct rps_dev_flow *rflow, u8 log, unsigned int cpu){ unsigned int flow_last_active; unsigned int sd_input_head;
if (cpu >= nr_cpu_ids) return false;
sd_input_head = READ_ONCE(per_cpu(softnet_data, cpu).input_queue_head); flow_last_active = READ_ONCE(rflow->last_qtail);
return (int)(sd_input_head - flow_last_active) < (int)(10 << log);}#endif
static struct rps_dev_flow *set_rps_cpu(struct net_device *dev, struct sk_buff *skb, struct rps_dev_flow *rflow, u16 next_cpu, u32 hash){ if (next_cpu < nr_cpu_ids) { u32 head;#ifdef CONFIG_RFS_ACCEL struct netdev_rx_queue *rxqueue; struct rps_dev_flow *flow_table; struct rps_dev_flow *old_rflow; struct rps_dev_flow *tmp_rflow; rps_tag_ptr q_tag_ptr; unsigned int tmp_cpu; u16 rxq_index; u32 flow_id; int rc;
/* Should we steer this flow to a different hardware queue? */ if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap || !(dev->features & NETIF_F_NTUPLE)) goto out; rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu); if (rxq_index == skb_get_rx_queue(skb)) goto out;
rxqueue = dev->_rx + rxq_index; q_tag_ptr = READ_ONCE(rxqueue->rps_flow_table); if (!q_tag_ptr) goto out;
flow_id = rfs_slot(hash, q_tag_ptr); flow_table = rps_tag_to_table(q_tag_ptr); tmp_rflow = flow_table + flow_id; tmp_cpu = READ_ONCE(tmp_rflow->cpu);
if (READ_ONCE(tmp_rflow->filter) != RPS_NO_FILTER) { if (rps_flow_is_active(tmp_rflow, rps_tag_to_log(q_tag_ptr), tmp_cpu)) { if (hash != READ_ONCE(tmp_rflow->hash) || next_cpu == tmp_cpu) goto out; } }
rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb, rxq_index, flow_id); if (rc < 0) goto out;
old_rflow = rflow; rflow = tmp_rflow; WRITE_ONCE(rflow->filter, rc); WRITE_ONCE(rflow->hash, hash);
if (old_rflow->filter == rc) WRITE_ONCE(old_rflow->filter, RPS_NO_FILTER); out:#endif head = READ_ONCE(per_cpu(softnet_data, next_cpu).input_queue_head); rps_input_queue_tail_save(&rflow->last_qtail, head); }
WRITE_ONCE(rflow->cpu, next_cpu); return rflow;}
/* * get_rps_cpu is called from netif_receive_skb and returns the target * CPU from the RPS map of the receiving queue for a given skb. * rcu_read_lock must be held on entry. */static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb, struct rps_dev_flow **rflowp){ struct netdev_rx_queue *rxqueue = dev->_rx; rps_tag_ptr global_tag_ptr, q_tag_ptr; struct rps_map *map; int cpu = -1; u32 tcpu; u32 hash;
if (skb_rx_queue_recorded(skb)) { u16 index = skb_get_rx_queue(skb);
if (unlikely(index >= dev->real_num_rx_queues)) { WARN_ONCE(dev->real_num_rx_queues > 1, "%s received packet on queue %u, but number " "of RX queues is %u\n", dev->name, index, dev->real_num_rx_queues); goto done; } rxqueue += index; }
/* Avoid computing hash if RFS/RPS is not active for this rxqueue */
q_tag_ptr = READ_ONCE(rxqueue->rps_flow_table); map = rcu_dereference(rxqueue->rps_map); if (!q_tag_ptr && !map) goto done;
skb_reset_network_header(skb); hash = skb_get_hash(skb); if (!hash) goto done;
global_tag_ptr = READ_ONCE(net_hotdata.rps_sock_flow_table); if (q_tag_ptr && global_tag_ptr) { struct rps_sock_flow_table *sock_flow_table; struct rps_dev_flow *flow_table; struct rps_dev_flow *rflow; u32 next_cpu; u32 flow_id; u32 ident;
/* First check into global flow table if there is a match. * This READ_ONCE() pairs with WRITE_ONCE() from rps_record_sock_flow(). */ flow_id = hash & rps_tag_to_mask(global_tag_ptr); sock_flow_table = rps_tag_to_table(global_tag_ptr); ident = READ_ONCE(sock_flow_table[flow_id].ent); if ((ident ^ hash) & ~net_hotdata.rps_cpu_mask) goto try_rps;
next_cpu = ident & net_hotdata.rps_cpu_mask;
/* OK, now we know there is a match, * we can look at the local (per receive queue) flow table */ flow_id = rfs_slot(hash, q_tag_ptr); flow_table = rps_tag_to_table(q_tag_ptr); rflow = flow_table + flow_id; tcpu = rflow->cpu;
/* * If the desired CPU (where last recvmsg was done) is * different from current CPU (one in the rx-queue flow * table entry), switch if one of the following holds: * - Current CPU is unset (>= nr_cpu_ids). * - Current CPU is offline. * - The current CPU's queue tail has advanced beyond the * last packet that was enqueued using this table entry. * This guarantees that all previous packets for the flow * have been dequeued, thus preserving in order delivery. */ if (unlikely(tcpu != next_cpu) && (tcpu >= nr_cpu_ids || !cpu_online(tcpu) || ((int)(READ_ONCE(per_cpu(softnet_data, tcpu).input_queue_head) - rflow->last_qtail)) >= 0)) { tcpu = next_cpu; rflow = set_rps_cpu(dev, skb, rflow, next_cpu, hash); }
if (tcpu < nr_cpu_ids && cpu_online(tcpu)) { *rflowp = rflow; cpu = tcpu; goto done; } }
try_rps:
if (map) { tcpu = map->cpus[reciprocal_scale(hash, map->len)]; if (cpu_online(tcpu)) { cpu = tcpu; goto done; } }
done: return cpu;}
#ifdef CONFIG_RFS_ACCEL
/** * rps_may_expire_flow - check whether an RFS hardware filter may be removed * @dev: Device on which the filter was set * @rxq_index: RX queue index * @flow_id: Flow ID passed to ndo_rx_flow_steer() * @filter_id: Filter ID returned by ndo_rx_flow_steer() * * Drivers that implement ndo_rx_flow_steer() should periodically call * this function for each installed filter and remove the filters for * which it returns %true. */bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id, u16 filter_id){ struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index; struct rps_dev_flow *flow_table; struct rps_dev_flow *rflow; rps_tag_ptr q_tag_ptr; bool expire = true; u8 log;
rcu_read_lock(); q_tag_ptr = READ_ONCE(rxqueue->rps_flow_table); log = rps_tag_to_log(q_tag_ptr); if (q_tag_ptr && flow_id < (1UL << log)) { unsigned int cpu;
flow_table = rps_tag_to_table(q_tag_ptr); rflow = flow_table + flow_id; cpu = READ_ONCE(rflow->cpu); if (READ_ONCE(rflow->filter) == filter_id && rps_flow_is_active(rflow, log, cpu)) expire = false; } rcu_read_unlock(); return expire;}EXPORT_SYMBOL(rps_may_expire_flow);
#endif /* CONFIG_RFS_ACCEL */
/* Called from hardirq (IPI) context */static void rps_trigger_softirq(void *data){ struct softnet_data *sd = data;
____napi_schedule(sd, &sd->backlog); /* Pairs with READ_ONCE() in softnet_seq_show() */ WRITE_ONCE(sd->received_rps, sd->received_rps + 1);}
#endif /* CONFIG_RPS */
/* Called from hardirq (IPI) context */static void trigger_rx_softirq(void *data){ struct softnet_data *sd = data;
__raise_softirq_irqoff(NET_RX_SOFTIRQ); smp_store_release(&sd->defer_ipi_scheduled, 0);}
/* * After we queued a packet into sd->input_pkt_queue, * we need to make sure this queue is serviced soon. * * - If this is another cpu queue, link it to our rps_ipi_list, * and make sure we will process rps_ipi_list from net_rx_action(). * * - If this is our own queue, NAPI schedule our backlog. * Note that this also raises NET_RX_SOFTIRQ. */static void napi_schedule_rps(struct softnet_data *sd){ struct softnet_data *mysd = this_cpu_ptr(&softnet_data);
#ifdef CONFIG_RPS if (sd != mysd) { if (use_backlog_threads()) { __napi_schedule_irqoff(&sd->backlog); return; }
sd->rps_ipi_next = mysd->rps_ipi_list; mysd->rps_ipi_list = sd;
/* If not called from net_rx_action() or napi_threaded_poll() * we have to raise NET_RX_SOFTIRQ. */ if (!mysd->in_net_rx_action && !mysd->in_napi_threaded_poll) __raise_softirq_irqoff(NET_RX_SOFTIRQ); return; }#endif /* CONFIG_RPS */ __napi_schedule_irqoff(&mysd->backlog);}
void kick_defer_list_purge(unsigned int cpu){ struct softnet_data *sd = &per_cpu(softnet_data, cpu); unsigned long flags;
if (use_backlog_threads()) { backlog_lock_irq_save(sd, &flags);
if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) __napi_schedule_irqoff(&sd->backlog);
backlog_unlock_irq_restore(sd, flags);
} else if (!cmpxchg(&sd->defer_ipi_scheduled, 0, 1)) { if (smp_call_function_single_async(cpu, &sd->defer_csd)) WRITE_ONCE(sd->defer_ipi_scheduled, 0); }}
#ifdef CONFIG_NET_FLOW_LIMITint netdev_flow_limit_table_len __read_mostly = (1 << 12);#endif
static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen, int max_backlog){#ifdef CONFIG_NET_FLOW_LIMIT unsigned int old_flow, new_flow; const struct softnet_data *sd; struct sd_flow_limit *fl;
if (likely(qlen < (max_backlog >> 1))) return false;
sd = this_cpu_ptr(&softnet_data);
rcu_read_lock(); fl = rcu_dereference(sd->flow_limit); if (fl) { new_flow = hash_32(skb_get_hash(skb), fl->log_buckets); old_flow = fl->history[fl->history_head]; fl->history[fl->history_head] = new_flow;
fl->history_head++; fl->history_head &= FLOW_LIMIT_HISTORY - 1;
if (likely(fl->buckets[old_flow])) fl->buckets[old_flow]--;
if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) { /* Pairs with READ_ONCE() in softnet_seq_show() */ WRITE_ONCE(fl->count, fl->count + 1); rcu_read_unlock(); return true; } } rcu_read_unlock();#endif return false;}
/* * enqueue_to_backlog is called to queue an skb to a per CPU backlog * queue (may be a remote CPU queue). */static int enqueue_to_backlog(struct sk_buff *skb, int cpu, unsigned int *qtail){ enum skb_drop_reason reason; struct softnet_data *sd; unsigned long flags; unsigned int qlen; int max_backlog; u32 tail;
reason = SKB_DROP_REASON_DEV_READY;
sd = &per_cpu(softnet_data, cpu);
qlen = skb_queue_len_lockless(&sd->input_pkt_queue); max_backlog = READ_ONCE(net_hotdata.max_backlog); if (unlikely(qlen > max_backlog) || skb_flow_limit(skb, qlen, max_backlog)) goto cpu_backlog_drop; backlog_lock_irq_save(sd, &flags); qlen = skb_queue_len(&sd->input_pkt_queue); if (likely(qlen <= max_backlog)) { if (unlikely(!netif_running(skb->dev))) { backlog_unlock_irq_restore(sd, flags); goto bad_dev; } if (!qlen) { /* Schedule NAPI for backlog device. We can use * non atomic operation as we own the queue lock. */ if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) napi_schedule_rps(sd); } __skb_queue_tail(&sd->input_pkt_queue, skb); tail = rps_input_queue_tail_incr(sd); backlog_unlock_irq_restore(sd, flags);
/* save the tail outside of the critical section */ rps_input_queue_tail_save(qtail, tail); return NET_RX_SUCCESS; }
backlog_unlock_irq_restore(sd, flags);
cpu_backlog_drop: reason = SKB_DROP_REASON_CPU_BACKLOG; numa_drop_add(&sd->drop_counters, 1);bad_dev: dev_core_stats_rx_dropped_inc(skb->dev); kfree_skb_reason(skb, reason); return NET_RX_DROP;}
static struct netdev_rx_queue *netif_get_rxqueue(struct sk_buff *skb){ struct net_device *dev = skb->dev; struct netdev_rx_queue *rxqueue;
rxqueue = dev->_rx;
if (skb_rx_queue_recorded(skb)) { u16 index = skb_get_rx_queue(skb);
if (unlikely(index >= dev->real_num_rx_queues)) { WARN_ONCE(dev->real_num_rx_queues > 1, "%s received packet on queue %u, but number " "of RX queues is %u\n", dev->name, index, dev->real_num_rx_queues);
return rxqueue; /* Return first rxqueue */ } rxqueue += index; } return rxqueue;}
u32 bpf_prog_run_generic_xdp(struct sk_buff *skb, struct xdp_buff *xdp, const struct bpf_prog *xdp_prog){ void *orig_data, *orig_data_end, *hard_start; struct netdev_rx_queue *rxqueue; bool orig_bcast, orig_host; u32 mac_len, frame_sz; __be16 orig_eth_type; struct ethhdr *eth; u32 metalen, act; int off;
/* The XDP program wants to see the packet starting at the MAC * header. */ mac_len = skb->data - skb_mac_header(skb); hard_start = skb->data - skb_headroom(skb);
/* SKB "head" area always have tailroom for skb_shared_info */ frame_sz = (void *)skb_end_pointer(skb) - hard_start; frame_sz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
rxqueue = netif_get_rxqueue(skb); xdp_init_buff(xdp, frame_sz, &rxqueue->xdp_rxq); xdp_prepare_buff(xdp, hard_start, skb_headroom(skb) - mac_len, skb_headlen(skb) + mac_len, true); if (skb_is_nonlinear(skb)) { skb_shinfo(skb)->xdp_frags_size = skb->data_len; xdp_buff_set_frags_flag(xdp); } else { xdp_buff_clear_frags_flag(xdp); }
orig_data_end = xdp->data_end; orig_data = xdp->data; eth = (struct ethhdr *)xdp->data; orig_host = ether_addr_equal_64bits(eth->h_dest, skb->dev->dev_addr); orig_bcast = is_multicast_ether_addr_64bits(eth->h_dest); orig_eth_type = eth->h_proto;
act = bpf_prog_run_xdp(xdp_prog, xdp);
/* check if bpf_xdp_adjust_head was used */ off = xdp->data - orig_data; if (off) { if (off > 0) __skb_pull(skb, off); else if (off < 0) __skb_push(skb, -off);
skb->mac_header += off; skb_reset_network_header(skb); }
/* check if bpf_xdp_adjust_tail was used */ off = xdp->data_end - orig_data_end; if (off != 0) { skb_set_tail_pointer(skb, xdp->data_end - xdp->data); skb->len += off; /* positive on grow, negative on shrink */ }
/* XDP frag metadata (e.g. nr_frags) are updated in eBPF helpers * (e.g. bpf_xdp_adjust_tail). Remove the old fragment contribution * from skb->len before updating data_len, then add the new one back. */ skb->len -= skb->data_len; if (xdp_buff_has_frags(xdp)) { skb->data_len = skb_shinfo(skb)->xdp_frags_size; skb->len += skb->data_len; } else { skb->data_len = 0; }
/* check if XDP changed eth hdr such SKB needs update */ eth = (struct ethhdr *)xdp->data; if ((orig_eth_type != eth->h_proto) || (orig_host != ether_addr_equal_64bits(eth->h_dest, skb->dev->dev_addr)) || (orig_bcast != is_multicast_ether_addr_64bits(eth->h_dest))) { __skb_push(skb, ETH_HLEN); skb->pkt_type = PACKET_HOST; skb->protocol = eth_type_trans(skb, skb->dev); }
/* Redirect/Tx gives L2 packet, code that will reuse skb must __skb_pull * before calling us again on redirect path. We do not call do_redirect * as we leave that up to the caller. * * Caller is responsible for managing lifetime of skb (i.e. calling * kfree_skb in response to actions it cannot handle/XDP_DROP). */ switch (act) { case XDP_REDIRECT: case XDP_TX: __skb_push(skb, mac_len); break; case XDP_PASS: metalen = xdp->data - xdp->data_meta; if (metalen) skb_metadata_set(skb, metalen); break; }
return act;}
static intnetif_skb_check_for_xdp(struct sk_buff **pskb, const struct bpf_prog *prog){ struct sk_buff *skb = *pskb; int err, hroom, troom;
local_lock_nested_bh(&system_page_pool.bh_lock); err = skb_cow_data_for_xdp(this_cpu_read(system_page_pool.pool), pskb, prog); local_unlock_nested_bh(&system_page_pool.bh_lock); if (!err) return 0;
/* In case we have to go down the path and also linearize, * then lets do the pskb_expand_head() work just once here. */ hroom = XDP_PACKET_HEADROOM - skb_headroom(skb); troom = skb->tail + skb->data_len - skb->end; err = pskb_expand_head(skb, hroom > 0 ? ALIGN(hroom, NET_SKB_PAD) : 0, troom > 0 ? troom + 128 : 0, GFP_ATOMIC); if (err) return err;
return skb_linearize(skb);}
static u32 netif_receive_generic_xdp(struct sk_buff **pskb, struct xdp_buff *xdp, const struct bpf_prog *xdp_prog){ struct sk_buff *skb = *pskb; u32 mac_len, act = XDP_DROP;
/* Reinjected packets coming from act_mirred or similar should * not get XDP generic processing. */ if (skb_is_redirected(skb)) return XDP_PASS;
/* XDP packets must have sufficient headroom of XDP_PACKET_HEADROOM * bytes. This is the guarantee that also native XDP provides, * thus we need to do it here as well. */ mac_len = skb->data - skb_mac_header(skb); __skb_push(skb, mac_len);
if (skb_cloned(skb) || skb_is_nonlinear(skb) || skb_headroom(skb) < XDP_PACKET_HEADROOM) { if (netif_skb_check_for_xdp(pskb, xdp_prog)) goto do_drop; }
__skb_pull(*pskb, mac_len);
act = bpf_prog_run_generic_xdp(*pskb, xdp, xdp_prog); switch (act) { case XDP_REDIRECT: case XDP_TX: case XDP_PASS: break; default: bpf_warn_invalid_xdp_action((*pskb)->dev, xdp_prog, act); fallthrough; case XDP_ABORTED: trace_xdp_exception((*pskb)->dev, xdp_prog, act); fallthrough; case XDP_DROP: do_drop: kfree_skb(*pskb); break; }
return act;}
/* When doing generic XDP we have to bypass the qdisc layer and the * network taps in order to match in-driver-XDP behavior. This also means * that XDP packets are able to starve other packets going through a qdisc, * and DDOS attacks will be more effective. In-driver-XDP use dedicated TX * queues, so they do not have this starvation issue. */void generic_xdp_tx(struct sk_buff *skb, const struct bpf_prog *xdp_prog){ struct net_device *dev = skb->dev; struct netdev_queue *txq; bool free_skb = true; int cpu, rc;
txq = netdev_core_pick_tx(dev, skb, NULL); cpu = smp_processor_id(); HARD_TX_LOCK(dev, txq, cpu); if (!netif_xmit_frozen_or_drv_stopped(txq)) { rc = netdev_start_xmit(skb, dev, txq, 0); if (dev_xmit_complete(rc)) free_skb = false; } HARD_TX_UNLOCK(dev, txq); if (free_skb) { trace_xdp_exception(dev, xdp_prog, XDP_TX); dev_core_stats_tx_dropped_inc(dev); kfree_skb(skb); }}
static DEFINE_STATIC_KEY_FALSE(generic_xdp_needed_key);
int do_xdp_generic(const struct bpf_prog *xdp_prog, struct sk_buff **pskb){ struct bpf_net_context __bpf_net_ctx, *bpf_net_ctx;
if (xdp_prog) { struct xdp_buff xdp; u32 act; int err;
bpf_net_ctx = bpf_net_ctx_set(&__bpf_net_ctx); act = netif_receive_generic_xdp(pskb, &xdp, xdp_prog); if (act != XDP_PASS) { switch (act) { case XDP_REDIRECT: err = xdp_do_generic_redirect((*pskb)->dev, *pskb, &xdp, xdp_prog); if (err) goto out_redir; break; case XDP_TX: generic_xdp_tx(*pskb, xdp_prog); break; } bpf_net_ctx_clear(bpf_net_ctx); return XDP_DROP; } bpf_net_ctx_clear(bpf_net_ctx); } return XDP_PASS;out_redir: bpf_net_ctx_clear(bpf_net_ctx); kfree_skb_reason(*pskb, SKB_DROP_REASON_XDP); return XDP_DROP;}EXPORT_SYMBOL_GPL(do_xdp_generic);
static int netif_rx_internal(struct sk_buff *skb){ int ret;
net_timestamp_check(READ_ONCE(net_hotdata.tstamp_prequeue), skb);
trace_netif_rx(skb);
#ifdef CONFIG_RPS if (static_branch_unlikely(&rps_needed)) { struct rps_dev_flow voidflow, *rflow = &voidflow; int cpu;
rcu_read_lock();
cpu = get_rps_cpu(skb->dev, skb, &rflow); if (cpu < 0) cpu = smp_processor_id();
ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
rcu_read_unlock(); } else#endif { unsigned int qtail;
ret = enqueue_to_backlog(skb, smp_processor_id(), &qtail); } return ret;}
/** * __netif_rx - Slightly optimized version of netif_rx * @skb: buffer to post * * This behaves as netif_rx except that it does not disable bottom halves. * As a result this function may only be invoked from the interrupt context * (either hard or soft interrupt). */int __netif_rx(struct sk_buff *skb){ int ret;
lockdep_assert_once(hardirq_count() | softirq_count());
trace_netif_rx_entry(skb); ret = netif_rx_internal(skb); trace_netif_rx_exit(ret); return ret;}EXPORT_SYMBOL(__netif_rx);
/** * netif_rx - post buffer to the network code * @skb: buffer to post * * This function receives a packet from a device driver and queues it for * the upper (protocol) levels to process via the backlog NAPI device. It * always succeeds. The buffer may be dropped during processing for * congestion control or by the protocol layers. * The network buffer is passed via the backlog NAPI device. Modern NIC * driver should use NAPI and GRO. * This function can used from interrupt and from process context. The * caller from process context must not disable interrupts before invoking * this function. * * return values: * NET_RX_SUCCESS (no congestion) * NET_RX_DROP (packet was dropped) * */int netif_rx(struct sk_buff *skb){ bool need_bh_off = !(hardirq_count() | softirq_count()); int ret;
if (need_bh_off) local_bh_disable(); trace_netif_rx_entry(skb); ret = netif_rx_internal(skb); trace_netif_rx_exit(ret); if (need_bh_off) local_bh_enable(); return ret;}EXPORT_SYMBOL(netif_rx);
static __latent_entropy void net_tx_action(void){ struct softnet_data *sd = this_cpu_ptr(&softnet_data);
if (sd->completion_queue) { struct sk_buff *clist;
local_irq_disable(); clist = sd->completion_queue; sd->completion_queue = NULL; local_irq_enable();
while (clist) { struct sk_buff *skb = clist;
clist = clist->next;
WARN_ON(refcount_read(&skb->users)); if (likely(get_kfree_skb_cb(skb)->reason == SKB_CONSUMED)) trace_consume_skb(skb, net_tx_action); else trace_kfree_skb(skb, net_tx_action, get_kfree_skb_cb(skb)->reason, NULL);
if (skb->fclone != SKB_FCLONE_UNAVAILABLE) __kfree_skb(skb); else __napi_kfree_skb(skb, get_kfree_skb_cb(skb)->reason); } }
if (sd->output_queue) { struct Qdisc *head;
local_irq_disable(); head = sd->output_queue; sd->output_queue = NULL; sd->output_queue_tailp = &sd->output_queue; local_irq_enable();
rcu_read_lock();
while (head) { spinlock_t *root_lock = NULL; struct sk_buff *to_free; struct Qdisc *q = head;
head = head->next_sched;
/* We need to make sure head->next_sched is read * before clearing __QDISC_STATE_SCHED */ smp_mb__before_atomic();
if (!(q->flags & TCQ_F_NOLOCK)) { root_lock = qdisc_lock(q); spin_lock(root_lock); } else if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { /* There is a synchronize_net() between * STATE_DEACTIVATED flag being set and * qdisc_reset()/some_qdisc_is_busy() in * dev_deactivate(), so we can safely bail out * early here to avoid data race between * qdisc_deactivate() and some_qdisc_is_busy() * for lockless qdisc. */ clear_bit(__QDISC_STATE_SCHED, &q->state); continue; }
clear_bit(__QDISC_STATE_SCHED, &q->state); to_free = qdisc_run(q); if (root_lock) spin_unlock(root_lock); tcf_kfree_skb_list(to_free, q, NULL, qdisc_dev(q)); }
rcu_read_unlock(); }
xfrm_dev_backlog(sd);}
/** * netdev_is_rx_handler_busy - check if receive handler is registered * @dev: device to check * * Check if a receive handler is already registered for a given device. * Return true if there one. * * The caller must hold the rtnl_mutex. */bool netdev_is_rx_handler_busy(struct net_device *dev){ ASSERT_RTNL(); return dev && rtnl_dereference(dev->rx_handler);}EXPORT_SYMBOL_GPL(netdev_is_rx_handler_busy);
/** * netdev_rx_handler_register - register receive handler * @dev: device to register a handler for * @rx_handler: receive handler to register * @rx_handler_data: data pointer that is used by rx handler * * Register a receive handler for a device. This handler will then be * called from __netif_receive_skb. A negative errno code is returned * on a failure. * * The caller must hold the rtnl_mutex. * * For a general description of rx_handler, see enum rx_handler_result. */int netdev_rx_handler_register(struct net_device *dev, rx_handler_func_t *rx_handler, void *rx_handler_data){ if (netdev_is_rx_handler_busy(dev)) return -EBUSY;
if (dev->priv_flags & IFF_NO_RX_HANDLER) return -EINVAL;
/* Note: rx_handler_data must be set before rx_handler */ rcu_assign_pointer(dev->rx_handler_data, rx_handler_data); rcu_assign_pointer(dev->rx_handler, rx_handler);
return 0;}EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
/** * netdev_rx_handler_unregister - unregister receive handler * @dev: device to unregister a handler from * * Unregister a receive handler from a device. * * The caller must hold the rtnl_mutex. */void netdev_rx_handler_unregister(struct net_device *dev){
ASSERT_RTNL(); RCU_INIT_POINTER(dev->rx_handler, NULL); /* a reader seeing a non NULL rx_handler in a rcu_read_lock() * section has a guarantee to see a non NULL rx_handler_data * as well. */ synchronize_net(); RCU_INIT_POINTER(dev->rx_handler_data, NULL);}EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
/* * Limit the use of PFMEMALLOC reserves to those protocols that implement * the special handling of PFMEMALLOC skbs. */static bool skb_pfmemalloc_protocol(struct sk_buff *skb){ switch (skb->protocol) { case htons(ETH_P_ARP): case htons(ETH_P_IP): case htons(ETH_P_IPV6): case htons(ETH_P_8021Q): case htons(ETH_P_8021AD): return true; default: return false; }}
static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret, struct net_device *orig_dev){ if (nf_hook_ingress_active(skb)) { int ingress_retval;
if (unlikely(*pt_prev)) { *ret = deliver_skb(skb, *pt_prev, orig_dev); *pt_prev = NULL; }
rcu_read_lock(); ingress_retval = nf_hook_ingress(skb); rcu_read_unlock(); return ingress_retval; } return 0;}
static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc, struct packet_type **ppt_prev){ enum skb_drop_reason drop_reason = SKB_DROP_REASON_UNHANDLED_PROTO; struct packet_type *ptype, *pt_prev; rx_handler_func_t *rx_handler; struct sk_buff *skb = *pskb; struct net_device *orig_dev; bool deliver_exact = false; int ret = NET_RX_DROP; __be16 type;
net_timestamp_check(!READ_ONCE(net_hotdata.tstamp_prequeue), skb);
trace_netif_receive_skb(skb);
orig_dev = skb->dev;
skb_reset_network_header(skb);#if !defined(CONFIG_DEBUG_NET) /* We plan to no longer reset the transport header here. * Give some time to fuzzers and dev build to catch bugs * in network stacks. */ if (!skb_transport_header_was_set(skb)) skb_reset_transport_header(skb);#endif skb_reset_mac_len(skb);
pt_prev = NULL;
another_round: skb->skb_iif = skb->dev->ifindex;
__this_cpu_inc(softnet_data.processed);
if (static_branch_unlikely(&generic_xdp_needed_key)) { int ret2;
migrate_disable(); ret2 = do_xdp_generic(rcu_dereference(skb->dev->xdp_prog), &skb); migrate_enable();
if (ret2 != XDP_PASS) { ret = NET_RX_DROP; goto out; } }
if (eth_type_vlan(skb->protocol)) { skb = skb_vlan_untag(skb); if (unlikely(!skb)) goto out; }
if (skb_skip_tc_classify(skb)) goto skip_classify;
if (pfmemalloc) goto skip_taps;
list_for_each_entry_rcu(ptype, &dev_net_rcu(skb->dev)->ptype_all, list) { if (unlikely(pt_prev)) ret = deliver_skb(skb, pt_prev, orig_dev); pt_prev = ptype; }
list_for_each_entry_rcu(ptype, &skb->dev->ptype_all, list) { if (unlikely(pt_prev)) ret = deliver_skb(skb, pt_prev, orig_dev); pt_prev = ptype; }
skip_taps:#ifdef CONFIG_NET_INGRESS if (static_branch_unlikely(&ingress_needed_key)) { bool another = false;
nf_skip_egress(skb, true); skb = sch_handle_ingress(skb, &pt_prev, &ret, orig_dev, &another); if (another) goto another_round; if (!skb) goto out;
nf_skip_egress(skb, false); if (nf_ingress(skb, &pt_prev, &ret, orig_dev) < 0) goto out; }#endif skb_reset_redirect(skb);skip_classify: if (pfmemalloc && !skb_pfmemalloc_protocol(skb)) { drop_reason = SKB_DROP_REASON_PFMEMALLOC; goto drop; }
if (skb_vlan_tag_present(skb)) { if (unlikely(pt_prev)) { ret = deliver_skb(skb, pt_prev, orig_dev); pt_prev = NULL; } if (vlan_do_receive(&skb)) goto another_round; else if (unlikely(!skb)) goto out; }
rx_handler = rcu_dereference(skb->dev->rx_handler); if (rx_handler) { if (unlikely(pt_prev)) { ret = deliver_skb(skb, pt_prev, orig_dev); pt_prev = NULL; } switch (rx_handler(&skb)) { case RX_HANDLER_CONSUMED: ret = NET_RX_SUCCESS; goto out; case RX_HANDLER_ANOTHER: goto another_round; case RX_HANDLER_EXACT: deliver_exact = true; break; case RX_HANDLER_PASS: break; default: BUG(); } }
if (unlikely(skb_vlan_tag_present(skb)) && !netdev_uses_dsa(skb->dev)) {check_vlan_id: if (skb_vlan_tag_get_id(skb)) { /* Vlan id is non 0 and vlan_do_receive() above couldn't * find vlan device. */ skb->pkt_type = PACKET_OTHERHOST; } else if (eth_type_vlan(skb->protocol)) { /* Outer header is 802.1P with vlan 0, inner header is * 802.1Q or 802.1AD and vlan_do_receive() above could * not find vlan dev for vlan id 0. */ __vlan_hwaccel_clear_tag(skb); skb = skb_vlan_untag(skb); if (unlikely(!skb)) goto out; if (vlan_do_receive(&skb)) /* After stripping off 802.1P header with vlan 0 * vlan dev is found for inner header. */ goto another_round; else if (unlikely(!skb)) goto out; else /* We have stripped outer 802.1P vlan 0 header. * But could not find vlan dev. * check again for vlan id to set OTHERHOST. */ goto check_vlan_id; } /* Note: we might in the future use prio bits * and set skb->priority like in vlan_do_receive() * For the time being, just ignore Priority Code Point */ __vlan_hwaccel_clear_tag(skb); }
type = skb->protocol;
/* deliver only exact match when indicated */ if (likely(!deliver_exact)) { deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, &ptype_base[ntohs(type) & PTYPE_HASH_MASK]);
/* orig_dev and skb->dev could belong to different netns; * Even in such case we need to traverse only the list * coming from skb->dev, as the ptype owner (packet socket) * will use dev_net(skb->dev) to do namespace filtering. */ deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, &dev_net_rcu(skb->dev)->ptype_specific); }
deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, &orig_dev->ptype_specific);
if (unlikely(skb->dev != orig_dev)) { deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, &skb->dev->ptype_specific); }
if (pt_prev) { *ppt_prev = pt_prev; } else {drop: if (!deliver_exact) dev_core_stats_rx_dropped_inc(skb->dev); else dev_core_stats_rx_nohandler_inc(skb->dev);
kfree_skb_reason(skb, drop_reason); /* Jamal, now you will not able to escape explaining * me how you were going to use this. :-) */ ret = NET_RX_DROP; }
out: /* The invariant here is that if *ppt_prev is not NULL * then skb should also be non-NULL. * * Apparently *ppt_prev assignment above holds this invariant due to * skb dereferencing near it. */ *pskb = skb; return ret;}
static int __netif_receive_skb_one_core(struct sk_buff *skb, bool pfmemalloc){ struct net_device *orig_dev = skb->dev; struct packet_type *pt_prev = NULL; int ret;
ret = __netif_receive_skb_core(&skb, pfmemalloc, &pt_prev); if (pt_prev) ret = INDIRECT_CALL_INET(pt_prev->func, ipv6_rcv, ip_rcv, skb, skb->dev, pt_prev, orig_dev); return ret;}
/** * netif_receive_skb_core - special purpose version of netif_receive_skb * @skb: buffer to process * * More direct receive version of netif_receive_skb(). It should * only be used by callers that have a need to skip RPS and Generic XDP. * Caller must also take care of handling if ``(page_is_)pfmemalloc``. * * This function may only be called from softirq context and interrupts * should be enabled. * * Return values (usually ignored): * NET_RX_SUCCESS: no congestion * NET_RX_DROP: packet was dropped */int netif_receive_skb_core(struct sk_buff *skb){ int ret;
rcu_read_lock(); ret = __netif_receive_skb_one_core(skb, false); rcu_read_unlock();
return ret;}EXPORT_SYMBOL(netif_receive_skb_core);
static inline void __netif_receive_skb_list_ptype(struct list_head *head, struct packet_type *pt_prev, struct net_device *orig_dev){ struct sk_buff *skb, *next;
if (!pt_prev) return; if (list_empty(head)) return; if (pt_prev->list_func != NULL) INDIRECT_CALL_INET(pt_prev->list_func, ipv6_list_rcv, ip_list_rcv, head, pt_prev, orig_dev); else list_for_each_entry_safe(skb, next, head, list) { skb_list_del_init(skb); pt_prev->func(skb, skb->dev, pt_prev, orig_dev); }}
static void __netif_receive_skb_list_core(struct list_head *head, bool pfmemalloc){ /* Fast-path assumptions: * - There is no RX handler. * - Only one packet_type matches. * If either of these fails, we will end up doing some per-packet * processing in-line, then handling the 'last ptype' for the whole * sublist. This can't cause out-of-order delivery to any single ptype, * because the 'last ptype' must be constant across the sublist, and all * other ptypes are handled per-packet. */ /* Current (common) ptype of sublist */ struct packet_type *pt_curr = NULL; /* Current (common) orig_dev of sublist */ struct net_device *od_curr = NULL; struct sk_buff *skb, *next; LIST_HEAD(sublist);
list_for_each_entry_safe(skb, next, head, list) { struct net_device *orig_dev = skb->dev; struct packet_type *pt_prev = NULL;
skb_list_del_init(skb); __netif_receive_skb_core(&skb, pfmemalloc, &pt_prev); if (!pt_prev) continue; if (pt_curr != pt_prev || od_curr != orig_dev) { /* dispatch old sublist */ __netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr); /* start new sublist */ INIT_LIST_HEAD(&sublist); pt_curr = pt_prev; od_curr = orig_dev; } list_add_tail(&skb->list, &sublist); }
/* dispatch final sublist */ __netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr);}
static int __netif_receive_skb(struct sk_buff *skb){ int ret;
if (sk_memalloc_socks() && skb_pfmemalloc(skb)) { unsigned int noreclaim_flag;
/* * PFMEMALLOC skbs are special, they should * - be delivered to SOCK_MEMALLOC sockets only * - stay away from userspace * - have bounded memory usage * * Use PF_MEMALLOC as this saves us from propagating the allocation * context down to all allocation sites. */ noreclaim_flag = memalloc_noreclaim_save(); ret = __netif_receive_skb_one_core(skb, true); memalloc_noreclaim_restore(noreclaim_flag); } else ret = __netif_receive_skb_one_core(skb, false);
return ret;}
static void __netif_receive_skb_list(struct list_head *head){ unsigned long noreclaim_flag = 0; struct sk_buff *skb, *next; bool pfmemalloc = false; /* Is current sublist PF_MEMALLOC? */
list_for_each_entry_safe(skb, next, head, list) { if ((sk_memalloc_socks() && skb_pfmemalloc(skb)) != pfmemalloc) { struct list_head sublist;
/* Handle the previous sublist */ list_cut_before(&sublist, head, &skb->list); if (!list_empty(&sublist)) __netif_receive_skb_list_core(&sublist, pfmemalloc); pfmemalloc = !pfmemalloc; /* See comments in __netif_receive_skb */ if (pfmemalloc) noreclaim_flag = memalloc_noreclaim_save(); else memalloc_noreclaim_restore(noreclaim_flag); } } /* Handle the remaining sublist */ if (!list_empty(head)) __netif_receive_skb_list_core(head, pfmemalloc); /* Restore pflags */ if (pfmemalloc) memalloc_noreclaim_restore(noreclaim_flag);}
static int generic_xdp_install(struct net_device *dev, struct netdev_bpf *xdp){ struct bpf_prog *old = rtnl_dereference(dev->xdp_prog); struct bpf_prog *new = xdp->prog; int ret = 0;
switch (xdp->command) { case XDP_SETUP_PROG: rcu_assign_pointer(dev->xdp_prog, new); if (old) bpf_prog_put(old);
if (old && !new) { static_branch_dec(&generic_xdp_needed_key); } else if (new && !old) { static_branch_inc(&generic_xdp_needed_key); netif_disable_lro(dev); dev_disable_gro_hw(dev); } break;
default: ret = -EINVAL; break; }
return ret;}
static int netif_receive_skb_internal(struct sk_buff *skb){ int ret;
net_timestamp_check(READ_ONCE(net_hotdata.tstamp_prequeue), skb);
if (skb_defer_rx_timestamp(skb)) return NET_RX_SUCCESS;
rcu_read_lock();#ifdef CONFIG_RPS if (static_branch_unlikely(&rps_needed)) { struct rps_dev_flow voidflow, *rflow = &voidflow; int cpu = get_rps_cpu(skb->dev, skb, &rflow);
if (cpu >= 0) { ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); rcu_read_unlock(); return ret; } }#endif ret = __netif_receive_skb(skb); rcu_read_unlock(); return ret;}
void netif_receive_skb_list_internal(struct list_head *head){ struct sk_buff *skb, *next; LIST_HEAD(sublist);
list_for_each_entry_safe(skb, next, head, list) { net_timestamp_check(READ_ONCE(net_hotdata.tstamp_prequeue), skb); skb_list_del_init(skb); if (!skb_defer_rx_timestamp(skb)) list_add_tail(&skb->list, &sublist); } list_splice_init(&sublist, head);
rcu_read_lock();#ifdef CONFIG_RPS if (static_branch_unlikely(&rps_needed)) { list_for_each_entry_safe(skb, next, head, list) { struct rps_dev_flow voidflow, *rflow = &voidflow; int cpu = get_rps_cpu(skb->dev, skb, &rflow);
if (cpu >= 0) { /* Will be handled, remove from list */ skb_list_del_init(skb); enqueue_to_backlog(skb, cpu, &rflow->last_qtail); } } }#endif __netif_receive_skb_list(head); rcu_read_unlock();}
/** * netif_receive_skb - process receive buffer from network * @skb: buffer to process * * netif_receive_skb() is the main receive data processing function. * It always succeeds. The buffer may be dropped during processing * for congestion control or by the protocol layers. * * This function may only be called from softirq context and interrupts * should be enabled. * * Return values (usually ignored): * NET_RX_SUCCESS: no congestion * NET_RX_DROP: packet was dropped */int netif_receive_skb(struct sk_buff *skb){ int ret;
trace_netif_receive_skb_entry(skb);
ret = netif_receive_skb_internal(skb); trace_netif_receive_skb_exit(ret);
return ret;}EXPORT_SYMBOL(netif_receive_skb);
/** * netif_receive_skb_list - process many receive buffers from network * @head: list of skbs to process. * * Since return value of netif_receive_skb() is normally ignored, and * wouldn't be meaningful for a list, this function returns void. * * This function may only be called from softirq context and interrupts * should be enabled. */void netif_receive_skb_list(struct list_head *head){ struct sk_buff *skb;
if (list_empty(head)) return; if (trace_netif_receive_skb_list_entry_enabled()) { list_for_each_entry(skb, head, list) trace_netif_receive_skb_list_entry(skb); } netif_receive_skb_list_internal(head); trace_netif_receive_skb_list_exit(0);}EXPORT_SYMBOL(netif_receive_skb_list);
/* Network device is going away, flush any packets still pending */static void flush_backlog(struct work_struct *work){ struct sk_buff *skb, *tmp; struct sk_buff_head list; struct softnet_data *sd;
__skb_queue_head_init(&list); local_bh_disable(); sd = this_cpu_ptr(&softnet_data);
backlog_lock_irq_disable(sd); skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) { if (READ_ONCE(skb->dev->reg_state) == NETREG_UNREGISTERING) { __skb_unlink(skb, &sd->input_pkt_queue); __skb_queue_tail(&list, skb); rps_input_queue_head_incr(sd); } } backlog_unlock_irq_enable(sd);
local_lock_nested_bh(&softnet_data.process_queue_bh_lock); skb_queue_walk_safe(&sd->process_queue, skb, tmp) { if (READ_ONCE(skb->dev->reg_state) == NETREG_UNREGISTERING) { __skb_unlink(skb, &sd->process_queue); __skb_queue_tail(&list, skb); rps_input_queue_head_incr(sd); } } local_unlock_nested_bh(&softnet_data.process_queue_bh_lock); local_bh_enable();
__skb_queue_purge_reason(&list, SKB_DROP_REASON_DEV_READY);}
static bool flush_required(int cpu){#if IS_ENABLED(CONFIG_RPS) struct softnet_data *sd = &per_cpu(softnet_data, cpu); bool do_flush;
backlog_lock_irq_disable(sd);
/* as insertion into process_queue happens with the rps lock held, * process_queue access may race only with dequeue */ do_flush = !skb_queue_empty(&sd->input_pkt_queue) || !skb_queue_empty_lockless(&sd->process_queue); backlog_unlock_irq_enable(sd);
return do_flush;#endif /* without RPS we can't safely check input_pkt_queue: during a * concurrent remote skb_queue_splice() we can detect as empty both * input_pkt_queue and process_queue even if the latter could end-up * containing a lot of packets. */ return true;}
struct flush_backlogs { cpumask_t flush_cpus; struct work_struct w[];};
static struct flush_backlogs *flush_backlogs_alloc(void){ return kmalloc_flex(struct flush_backlogs, w, nr_cpu_ids);}
static struct flush_backlogs *flush_backlogs_fallback;static DEFINE_MUTEX(flush_backlogs_mutex);
static void flush_all_backlogs(void){ struct flush_backlogs *ptr = flush_backlogs_alloc(); unsigned int cpu;
if (!ptr) { mutex_lock(&flush_backlogs_mutex); ptr = flush_backlogs_fallback; } cpumask_clear(&ptr->flush_cpus);
cpus_read_lock();
for_each_online_cpu(cpu) { if (flush_required(cpu)) { INIT_WORK(&ptr->w[cpu], flush_backlog); queue_work_on(cpu, system_highpri_wq, &ptr->w[cpu]); __cpumask_set_cpu(cpu, &ptr->flush_cpus); } }
/* we can have in flight packet[s] on the cpus we are not flushing, * synchronize_net() in unregister_netdevice_many() will take care of * them. */ for_each_cpu(cpu, &ptr->flush_cpus) flush_work(&ptr->w[cpu]);
cpus_read_unlock();
if (ptr != flush_backlogs_fallback) kfree(ptr); else mutex_unlock(&flush_backlogs_mutex);}
static void net_rps_send_ipi(struct softnet_data *remsd){#ifdef CONFIG_RPS while (remsd) { struct softnet_data *next = remsd->rps_ipi_next;
if (cpu_online(remsd->cpu)) smp_call_function_single_async(remsd->cpu, &remsd->csd); remsd = next; }#endif}
/* * net_rps_action_and_irq_enable sends any pending IPI's for rps. * Note: called with local irq disabled, but exits with local irq enabled. */static void net_rps_action_and_irq_enable(struct softnet_data *sd){#ifdef CONFIG_RPS struct softnet_data *remsd = sd->rps_ipi_list;
if (!use_backlog_threads() && remsd) { sd->rps_ipi_list = NULL;
local_irq_enable();
/* Send pending IPI's to kick RPS processing on remote cpus. */ net_rps_send_ipi(remsd); } else#endif local_irq_enable();}
static bool sd_has_rps_ipi_waiting(struct softnet_data *sd){#ifdef CONFIG_RPS return !use_backlog_threads() && sd->rps_ipi_list;#else return false;#endif}
static int process_backlog(struct napi_struct *napi, int quota){ struct softnet_data *sd = container_of(napi, struct softnet_data, backlog); bool again = true; int work = 0;
/* Check if we have pending ipi, its better to send them now, * not waiting net_rx_action() end. */ if (sd_has_rps_ipi_waiting(sd)) { local_irq_disable(); net_rps_action_and_irq_enable(sd); }
napi->weight = READ_ONCE(net_hotdata.dev_rx_weight); while (again) { struct sk_buff *skb;
local_lock_nested_bh(&softnet_data.process_queue_bh_lock); while ((skb = __skb_dequeue(&sd->process_queue))) { local_unlock_nested_bh(&softnet_data.process_queue_bh_lock); rcu_read_lock(); __netif_receive_skb(skb); rcu_read_unlock(); if (++work >= quota) { rps_input_queue_head_add(sd, work); return work; }
local_lock_nested_bh(&softnet_data.process_queue_bh_lock); } local_unlock_nested_bh(&softnet_data.process_queue_bh_lock);
backlog_lock_irq_disable(sd); if (skb_queue_empty(&sd->input_pkt_queue)) { /* * Inline a custom version of __napi_complete(). * only current cpu owns and manipulates this napi, * and NAPI_STATE_SCHED is the only possible flag set * on backlog. * We can use a plain write instead of clear_bit(), * and we dont need an smp_mb() memory barrier. */ napi->state &= NAPIF_STATE_THREADED; again = false; } else { local_lock_nested_bh(&softnet_data.process_queue_bh_lock); skb_queue_splice_tail_init(&sd->input_pkt_queue, &sd->process_queue); local_unlock_nested_bh(&softnet_data.process_queue_bh_lock); } backlog_unlock_irq_enable(sd); }
if (work) rps_input_queue_head_add(sd, work); return work;}
/** * __napi_schedule - schedule for receive * @n: entry to schedule * * The entry's receive function will be scheduled to run. * Consider using __napi_schedule_irqoff() if hard irqs are masked. */void __napi_schedule(struct napi_struct *n){ unsigned long flags;
local_irq_save(flags); ____napi_schedule(this_cpu_ptr(&softnet_data), n); local_irq_restore(flags);}EXPORT_SYMBOL(__napi_schedule);
/** * napi_schedule_prep - check if napi can be scheduled * @n: napi context * * Test if NAPI routine is already running, and if not mark * it as running. This is used as a condition variable to * insure only one NAPI poll instance runs. We also make * sure there is no pending NAPI disable. */bool napi_schedule_prep(struct napi_struct *n){ unsigned long new, val = READ_ONCE(n->state);
do { if (unlikely(val & NAPIF_STATE_DISABLE)) return false; new = val | NAPIF_STATE_SCHED;
/* Sets STATE_MISSED bit if STATE_SCHED was already set * This was suggested by Alexander Duyck, as compiler * emits better code than : * if (val & NAPIF_STATE_SCHED) * new |= NAPIF_STATE_MISSED; */ new |= (val & NAPIF_STATE_SCHED) / NAPIF_STATE_SCHED * NAPIF_STATE_MISSED; } while (!try_cmpxchg(&n->state, &val, new));
return !(val & NAPIF_STATE_SCHED);}EXPORT_SYMBOL(napi_schedule_prep);
/** * __napi_schedule_irqoff - schedule for receive * @n: entry to schedule * * Variant of __napi_schedule() assuming hard irqs are masked. * * On PREEMPT_RT enabled kernels this maps to __napi_schedule() * because the interrupt disabled assumption might not be true * due to force-threaded interrupts and spinlock substitution. */void __napi_schedule_irqoff(struct napi_struct *n){ if (!IS_ENABLED(CONFIG_PREEMPT_RT)) ____napi_schedule(this_cpu_ptr(&softnet_data), n); else __napi_schedule(n);}EXPORT_SYMBOL(__napi_schedule_irqoff);
bool napi_complete_done(struct napi_struct *n, int work_done){ unsigned long flags, val, new, timeout = 0; bool ret = true;
/* * 1) Don't let napi dequeue from the cpu poll list * just in case its running on a different cpu. * 2) If we are busy polling, do nothing here, we have * the guarantee we will be called later. */ if (unlikely(n->state & (NAPIF_STATE_NPSVC | NAPIF_STATE_IN_BUSY_POLL))) return false;
if (work_done) { if (n->gro.bitmask) timeout = napi_get_gro_flush_timeout(n); n->defer_hard_irqs_count = napi_get_defer_hard_irqs(n); } if (n->defer_hard_irqs_count > 0) { n->defer_hard_irqs_count--; timeout = napi_get_gro_flush_timeout(n); if (timeout) ret = false; }
/* * When the NAPI instance uses a timeout and keeps postponing * it, we need to bound somehow the time packets are kept in * the GRO layer. */ gro_flush_normal(&n->gro, !!timeout);
if (unlikely(!list_empty(&n->poll_list))) { /* If n->poll_list is not empty, we need to mask irqs */ local_irq_save(flags); list_del_init(&n->poll_list); local_irq_restore(flags); } WRITE_ONCE(n->list_owner, -1);
val = READ_ONCE(n->state); do { WARN_ON_ONCE(!(val & NAPIF_STATE_SCHED));
new = val & ~(NAPIF_STATE_MISSED | NAPIF_STATE_SCHED | NAPIF_STATE_SCHED_THREADED | NAPIF_STATE_PREFER_BUSY_POLL);
/* If STATE_MISSED was set, leave STATE_SCHED set, * because we will call napi->poll() one more time. * This C code was suggested by Alexander Duyck to help gcc. */ new |= (val & NAPIF_STATE_MISSED) / NAPIF_STATE_MISSED * NAPIF_STATE_SCHED; } while (!try_cmpxchg(&n->state, &val, new));
if (unlikely(val & NAPIF_STATE_MISSED)) { __napi_schedule(n); return false; }
if (timeout) hrtimer_start(&n->timer, ns_to_ktime(timeout), HRTIMER_MODE_REL_PINNED); return ret;}EXPORT_SYMBOL(napi_complete_done);
static void __skb_defer_free_flush(struct skb_defer_node *sdn, int budget){ struct llist_node *free_list; struct sk_buff *skb, *next;
if (llist_empty(&sdn->defer_list)) return; atomic_long_set(&sdn->defer_count, 0); free_list = llist_del_all(&sdn->defer_list);
llist_for_each_entry_safe(skb, next, free_list, ll_node) { prefetch(next); napi_consume_skb(skb, budget); }}
void skb_defer_node_flush(struct skb_defer_node *sdn){ __skb_defer_free_flush(sdn, 0);}
static void skb_defer_free_flush(void){ struct skb_defer_node *sdn; int node;
for_each_node(node) { sdn = this_cpu_ptr(net_hotdata.skb_defer_nodes) + node; __skb_defer_free_flush(sdn, 1); }}
#if defined(CONFIG_NET_RX_BUSY_POLL)
enum { NAPI_F_PREFER_BUSY_POLL = 1, NAPI_F_END_ON_RESCHED = 2,};
static void busy_poll_stop(struct napi_struct *napi, void *have_poll_lock, unsigned flags, u16 budget){ struct bpf_net_context __bpf_net_ctx, *bpf_net_ctx; unsigned long timeout = 0; int rc;
/* Busy polling means there is a high chance device driver hard irq * could not grab NAPI_STATE_SCHED, and that NAPI_STATE_MISSED was * set in napi_schedule_prep(). * Since we either call napi->poll() once more or start the timer, * we can safely clear NAPI_STATE_MISSED. * * Note: x86 could use a single "lock and ..." instruction * to perform these two clear_bit() */ clear_bit(NAPI_STATE_MISSED, &napi->state); clear_bit(NAPI_STATE_IN_BUSY_POLL, &napi->state);
local_bh_disable(); bpf_net_ctx = bpf_net_ctx_set(&__bpf_net_ctx);
if (flags & NAPI_F_PREFER_BUSY_POLL) { napi->defer_hard_irqs_count = napi_get_defer_hard_irqs(napi); if (napi->defer_hard_irqs_count) timeout = napi_get_gro_flush_timeout(napi); } if (timeout) { netpoll_poll_unlock(have_poll_lock);
/* Drain aged GRO packets before clearing SCHED since the NAPI * won't run again until after the timer fires. When HZ < 1000, * GRO age comparison is too coarse, so flush everything. */ gro_flush_normal(&napi->gro, HZ >= 1000);
clear_bit(NAPI_STATE_SCHED, &napi->state); hrtimer_start(&napi->timer, ns_to_ktime(timeout), HRTIMER_MODE_REL_PINNED); } else { /* Use driver poll to re-enable device interrupts. */ rc = napi->poll(napi, budget); /* Unless rc == budget we no longer own the NAPI instance, * IRQ may fire on another CPU, poll this NAPI, and enter GRO. */ trace_napi_poll(napi, rc, budget); netpoll_poll_unlock(have_poll_lock); if (rc == budget) { gro_normal_list(&napi->gro); __napi_schedule(napi); } }
bpf_net_ctx_clear(bpf_net_ctx); local_bh_enable();}
static void __napi_busy_loop(unsigned int napi_id, bool (*loop_end)(void *, unsigned long), void *loop_end_arg, unsigned flags, u16 budget){ unsigned long start_time = loop_end ? busy_loop_current_time() : 0; int (*napi_poll)(struct napi_struct *napi, int budget); struct bpf_net_context __bpf_net_ctx, *bpf_net_ctx; void *have_poll_lock = NULL; struct napi_struct *napi;
WARN_ON_ONCE(!rcu_read_lock_held());
restart: napi_poll = NULL;
napi = napi_by_id(napi_id); if (!napi) return;
if (!IS_ENABLED(CONFIG_PREEMPT_RT)) preempt_disable(); for (;;) { int work = 0;
local_bh_disable(); bpf_net_ctx = bpf_net_ctx_set(&__bpf_net_ctx); if (!napi_poll) { unsigned long val = READ_ONCE(napi->state);
/* If multiple threads are competing for this napi, * we avoid dirtying napi->state as much as we can. */ if (val & (NAPIF_STATE_DISABLE | NAPIF_STATE_SCHED | NAPIF_STATE_IN_BUSY_POLL)) { if (flags & NAPI_F_PREFER_BUSY_POLL) set_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state); goto count; } if (cmpxchg(&napi->state, val, val | NAPIF_STATE_IN_BUSY_POLL | NAPIF_STATE_SCHED) != val) { if (flags & NAPI_F_PREFER_BUSY_POLL) set_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state); goto count; } have_poll_lock = netpoll_poll_lock(napi); napi_poll = napi->poll; } work = napi_poll(napi, budget); trace_napi_poll(napi, work, budget); gro_normal_list(&napi->gro);count: if (work > 0) __NET_ADD_STATS(dev_net(napi->dev), LINUX_MIB_BUSYPOLLRXPACKETS, work); skb_defer_free_flush(); bpf_net_ctx_clear(bpf_net_ctx); local_bh_enable();
if (!loop_end || loop_end(loop_end_arg, start_time)) break;
if (unlikely(need_resched())) { if (flags & NAPI_F_END_ON_RESCHED) break; if (napi_poll) busy_poll_stop(napi, have_poll_lock, flags, budget); if (!IS_ENABLED(CONFIG_PREEMPT_RT)) preempt_enable(); rcu_read_unlock(); cond_resched(); rcu_read_lock(); if (loop_end(loop_end_arg, start_time)) return; goto restart; } cpu_relax(); } if (napi_poll) busy_poll_stop(napi, have_poll_lock, flags, budget); if (!IS_ENABLED(CONFIG_PREEMPT_RT)) preempt_enable();}
void napi_busy_loop_rcu(unsigned int napi_id, bool (*loop_end)(void *, unsigned long), void *loop_end_arg, bool prefer_busy_poll, u16 budget){ unsigned flags = NAPI_F_END_ON_RESCHED;
if (prefer_busy_poll) flags |= NAPI_F_PREFER_BUSY_POLL;
__napi_busy_loop(napi_id, loop_end, loop_end_arg, flags, budget);}
void napi_busy_loop(unsigned int napi_id, bool (*loop_end)(void *, unsigned long), void *loop_end_arg, bool prefer_busy_poll, u16 budget){ unsigned flags = prefer_busy_poll ? NAPI_F_PREFER_BUSY_POLL : 0;
rcu_read_lock(); __napi_busy_loop(napi_id, loop_end, loop_end_arg, flags, budget); rcu_read_unlock();}EXPORT_SYMBOL(napi_busy_loop);
void napi_suspend_irqs(unsigned int napi_id){ struct napi_struct *napi;
rcu_read_lock(); napi = napi_by_id(napi_id); if (napi) { unsigned long timeout = napi_get_irq_suspend_timeout(napi);
if (timeout) hrtimer_start(&napi->timer, ns_to_ktime(timeout), HRTIMER_MODE_REL_PINNED); } rcu_read_unlock();}
void napi_resume_irqs(unsigned int napi_id){ struct napi_struct *napi;
rcu_read_lock(); napi = napi_by_id(napi_id); if (napi) { /* If irq_suspend_timeout is set to 0 between the call to * napi_suspend_irqs and now, the original value still * determines the safety timeout as intended and napi_watchdog * will resume irq processing. */ if (napi_get_irq_suspend_timeout(napi)) { local_bh_disable(); napi_schedule(napi); local_bh_enable(); } } rcu_read_unlock();}
#endif /* CONFIG_NET_RX_BUSY_POLL */
static void __napi_hash_add_with_id(struct napi_struct *napi, unsigned int napi_id){ napi->gro.cached_napi_id = napi_id;
WRITE_ONCE(napi->napi_id, napi_id); hlist_add_head_rcu(&napi->napi_hash_node, &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]);}
static void napi_hash_add_with_id(struct napi_struct *napi, unsigned int napi_id){ unsigned long flags;
spin_lock_irqsave(&napi_hash_lock, flags); WARN_ON_ONCE(napi_by_id(napi_id)); __napi_hash_add_with_id(napi, napi_id); spin_unlock_irqrestore(&napi_hash_lock, flags);}
static void napi_hash_add(struct napi_struct *napi){ unsigned long flags;
if (test_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state)) return;
spin_lock_irqsave(&napi_hash_lock, flags);
/* 0..NR_CPUS range is reserved for sender_cpu use */ do { if (unlikely(!napi_id_valid(++napi_gen_id))) napi_gen_id = MIN_NAPI_ID; } while (napi_by_id(napi_gen_id));
__napi_hash_add_with_id(napi, napi_gen_id);
spin_unlock_irqrestore(&napi_hash_lock, flags);}
/* Warning : caller is responsible to make sure rcu grace period * is respected before freeing memory containing @napi */static void napi_hash_del(struct napi_struct *napi){ unsigned long flags;
spin_lock_irqsave(&napi_hash_lock, flags);
hlist_del_init_rcu(&napi->napi_hash_node);
spin_unlock_irqrestore(&napi_hash_lock, flags);}
static enum hrtimer_restart napi_watchdog(struct hrtimer *timer){ struct napi_struct *napi;
napi = container_of(timer, struct napi_struct, timer);
/* Note : we use a relaxed variant of napi_schedule_prep() not setting * NAPI_STATE_MISSED, since we do not react to a device IRQ. */ if (!napi_disable_pending(napi) && !test_and_set_bit(NAPI_STATE_SCHED, &napi->state)) { clear_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state); __napi_schedule_irqoff(napi); }
return HRTIMER_NORESTART;}
static void napi_stop_kthread(struct napi_struct *napi){ unsigned long val, new;
/* Wait until the napi STATE_THREADED is unset. */ while (true) { val = READ_ONCE(napi->state);
/* If napi kthread own this napi or the napi is idle, * STATE_THREADED can be unset here. */ if ((val & NAPIF_STATE_SCHED_THREADED) || !(val & NAPIF_STATE_SCHED)) { new = val & (~(NAPIF_STATE_THREADED | NAPIF_STATE_THREADED_BUSY_POLL)); } else { msleep(20); continue; }
if (try_cmpxchg(&napi->state, &val, new)) break; }
/* Once STATE_THREADED is unset, wait for SCHED_THREADED to be unset by * the kthread. */ while (true) { if (!test_bit(NAPI_STATE_SCHED_THREADED, &napi->state)) break;
msleep(20); }
kthread_stop(napi->thread); napi->thread = NULL;}
static void napi_set_threaded_state(struct napi_struct *napi, enum netdev_napi_threaded threaded_mode){ bool threaded = threaded_mode != NETDEV_NAPI_THREADED_DISABLED; bool busy_poll = threaded_mode == NETDEV_NAPI_THREADED_BUSY_POLL;
assign_bit(NAPI_STATE_THREADED, &napi->state, threaded); assign_bit(NAPI_STATE_THREADED_BUSY_POLL, &napi->state, busy_poll);}
int napi_set_threaded(struct napi_struct *napi, enum netdev_napi_threaded threaded){ if (threaded) { if (!napi->thread) { int err = napi_kthread_create(napi);
if (err) return err; } }
if (napi->config) napi->config->threaded = threaded;
/* Setting/unsetting threaded mode on a napi might not immediately * take effect, if the current napi instance is actively being * polled. In this case, the switch between threaded mode and * softirq mode will happen in the next round of napi_schedule(). * This should not cause hiccups/stalls to the live traffic. */ if (!threaded && napi->thread) { napi_stop_kthread(napi); } else { /* Make sure kthread is created before THREADED bit is set. */ smp_mb__before_atomic(); napi_set_threaded_state(napi, threaded); }
return 0;}
int netif_set_threaded(struct net_device *dev, enum netdev_napi_threaded threaded){ struct napi_struct *napi; int i, err = 0;
netdev_assert_locked_or_invisible(dev);
if (threaded) { list_for_each_entry(napi, &dev->napi_list, dev_list) { if (!napi->thread) { err = napi_kthread_create(napi); if (err) { threaded = NETDEV_NAPI_THREADED_DISABLED; break; } } } }
WRITE_ONCE(dev->threaded, threaded);
/* The error should not occur as the kthreads are already created. */ list_for_each_entry(napi, &dev->napi_list, dev_list) WARN_ON_ONCE(napi_set_threaded(napi, threaded));
/* Override the config for all NAPIs even if currently not listed */ for (i = 0; i < dev->num_napi_configs; i++) dev->napi_config[i].threaded = threaded;
return err;}
/** * netif_threaded_enable() - enable threaded NAPIs * @dev: net_device instance * * Enable threaded mode for the NAPI instances of the device. This may be useful * for devices where multiple NAPI instances get scheduled by a single * interrupt. Threaded NAPI allows moving the NAPI processing to cores other * than the core where IRQ is mapped. * * This function should be called before @dev is registered. */void netif_threaded_enable(struct net_device *dev){ WARN_ON_ONCE(netif_set_threaded(dev, NETDEV_NAPI_THREADED_ENABLED));}EXPORT_SYMBOL(netif_threaded_enable);
/** * netif_queue_set_napi - Associate queue with the napi * @dev: device to which NAPI and queue belong * @queue_index: Index of queue * @type: queue type as RX or TX * @napi: NAPI context, pass NULL to clear previously set NAPI * * Set queue with its corresponding napi context. This should be done after * registering the NAPI handler for the queue-vector and the queues have been * mapped to the corresponding interrupt vector. */void netif_queue_set_napi(struct net_device *dev, unsigned int queue_index, enum netdev_queue_type type, struct napi_struct *napi){ struct netdev_rx_queue *rxq; struct netdev_queue *txq;
if (WARN_ON_ONCE(napi && !napi->dev)) return; netdev_assert_locked_ops_compat_or_invisible(dev);
switch (type) { case NETDEV_QUEUE_TYPE_RX: rxq = __netif_get_rx_queue(dev, queue_index); rxq->napi = napi; return; case NETDEV_QUEUE_TYPE_TX: txq = netdev_get_tx_queue(dev, queue_index); txq->napi = napi; return; default: return; }}EXPORT_SYMBOL(netif_queue_set_napi);
static voidnetif_napi_irq_notify(struct irq_affinity_notify *notify, const cpumask_t *mask){ struct napi_struct *napi = container_of(notify, struct napi_struct, notify);#ifdef CONFIG_RFS_ACCEL struct cpu_rmap *rmap = napi->dev->rx_cpu_rmap; int err;#endif
if (napi->config && napi->dev->irq_affinity_auto) cpumask_copy(&napi->config->affinity_mask, mask);
#ifdef CONFIG_RFS_ACCEL if (napi->dev->rx_cpu_rmap_auto) { err = cpu_rmap_update(rmap, napi->napi_rmap_idx, mask); if (err) netdev_warn(napi->dev, "RMAP update failed (%d)\n", err); }#endif}
#ifdef CONFIG_RFS_ACCELstatic void netif_napi_affinity_release(struct kref *ref){ struct napi_struct *napi = container_of(ref, struct napi_struct, notify.kref); struct cpu_rmap *rmap = napi->dev->rx_cpu_rmap;
netdev_assert_locked(napi->dev); WARN_ON(test_and_clear_bit(NAPI_STATE_HAS_NOTIFIER, &napi->state));
if (!napi->dev->rx_cpu_rmap_auto) return; rmap->obj[napi->napi_rmap_idx] = NULL; napi->napi_rmap_idx = -1; cpu_rmap_put(rmap);}
int netif_enable_cpu_rmap(struct net_device *dev, unsigned int num_irqs){ if (dev->rx_cpu_rmap_auto) return 0;
dev->rx_cpu_rmap = alloc_irq_cpu_rmap(num_irqs); if (!dev->rx_cpu_rmap) return -ENOMEM;
dev->rx_cpu_rmap_auto = true; return 0;}EXPORT_SYMBOL(netif_enable_cpu_rmap);
static void netif_del_cpu_rmap(struct net_device *dev){ struct cpu_rmap *rmap = dev->rx_cpu_rmap;
if (!dev->rx_cpu_rmap_auto) return;
/* Free the rmap */ cpu_rmap_put(rmap); dev->rx_cpu_rmap = NULL; dev->rx_cpu_rmap_auto = false;}
#elsestatic void netif_napi_affinity_release(struct kref *ref){}
int netif_enable_cpu_rmap(struct net_device *dev, unsigned int num_irqs){ return 0;}EXPORT_SYMBOL(netif_enable_cpu_rmap);
static void netif_del_cpu_rmap(struct net_device *dev){}#endif
void netif_set_affinity_auto(struct net_device *dev){ unsigned int i, maxqs, numa;
maxqs = max(dev->num_tx_queues, dev->num_rx_queues); numa = dev_to_node(&dev->dev);
for (i = 0; i < maxqs; i++) cpumask_set_cpu(cpumask_local_spread(i, numa), &dev->napi_config[i].affinity_mask);
dev->irq_affinity_auto = true;}EXPORT_SYMBOL(netif_set_affinity_auto);
void netif_napi_set_irq_locked(struct napi_struct *napi, int irq){ int rc;
netdev_assert_locked_or_invisible(napi->dev);
if (napi->irq == irq) return;
/* Remove existing resources */ if (test_and_clear_bit(NAPI_STATE_HAS_NOTIFIER, &napi->state)) irq_set_affinity_notifier(napi->irq, NULL);
napi->irq = irq; if (irq < 0 || (!napi->dev->rx_cpu_rmap_auto && !napi->dev->irq_affinity_auto)) return;
/* Abort for buggy drivers */ if (napi->dev->irq_affinity_auto && WARN_ON_ONCE(!napi->config)) return;
#ifdef CONFIG_RFS_ACCEL if (napi->dev->rx_cpu_rmap_auto) { rc = cpu_rmap_add(napi->dev->rx_cpu_rmap, napi); if (rc < 0) return;
cpu_rmap_get(napi->dev->rx_cpu_rmap); napi->napi_rmap_idx = rc; }#endif
/* Use core IRQ notifier */ napi->notify.notify = netif_napi_irq_notify; napi->notify.release = netif_napi_affinity_release; rc = irq_set_affinity_notifier(irq, &napi->notify); if (rc) { netdev_warn(napi->dev, "Unable to set IRQ notifier (%d)\n", rc); goto put_rmap; }
set_bit(NAPI_STATE_HAS_NOTIFIER, &napi->state); return;
put_rmap:#ifdef CONFIG_RFS_ACCEL if (napi->dev->rx_cpu_rmap_auto) { napi->dev->rx_cpu_rmap->obj[napi->napi_rmap_idx] = NULL; cpu_rmap_put(napi->dev->rx_cpu_rmap); napi->napi_rmap_idx = -1; }#endif napi->notify.notify = NULL; napi->notify.release = NULL;}EXPORT_SYMBOL(netif_napi_set_irq_locked);
static void napi_restore_config(struct napi_struct *n){ n->defer_hard_irqs = n->config->defer_hard_irqs; n->gro_flush_timeout = n->config->gro_flush_timeout; n->irq_suspend_timeout = n->config->irq_suspend_timeout;
if (n->dev->irq_affinity_auto && test_bit(NAPI_STATE_HAS_NOTIFIER, &n->state)) irq_set_affinity(n->irq, &n->config->affinity_mask);
/* a NAPI ID might be stored in the config, if so use it. if not, use * napi_hash_add to generate one for us. */ if (n->config->napi_id) { napi_hash_add_with_id(n, n->config->napi_id); } else { napi_hash_add(n); n->config->napi_id = n->napi_id; }
WARN_ON_ONCE(napi_set_threaded(n, n->config->threaded));}
static void napi_save_config(struct napi_struct *n){ n->config->defer_hard_irqs = n->defer_hard_irqs; n->config->gro_flush_timeout = n->gro_flush_timeout; n->config->irq_suspend_timeout = n->irq_suspend_timeout; napi_hash_del(n);}
/* Netlink wants the NAPI list to be sorted by ID, if adding a NAPI which will * inherit an existing ID try to insert it at the right position. */static voidnetif_napi_dev_list_add(struct net_device *dev, struct napi_struct *napi){ unsigned int new_id, pos_id; struct list_head *higher; struct napi_struct *pos;
new_id = UINT_MAX; if (napi->config && napi->config->napi_id) new_id = napi->config->napi_id;
higher = &dev->napi_list; list_for_each_entry(pos, &dev->napi_list, dev_list) { if (napi_id_valid(pos->napi_id)) pos_id = pos->napi_id; else if (pos->config) pos_id = pos->config->napi_id; else pos_id = UINT_MAX;
if (pos_id <= new_id) break; higher = &pos->dev_list; } list_add_rcu(&napi->dev_list, higher); /* adds after higher */}
/* Double check that napi_get_frags() allocates skbs with * skb->head being backed by slab, not a page fragment. * This is to make sure bug fixed in 3226b158e67c * ("net: avoid 32 x truesize under-estimation for tiny skbs") * does not accidentally come back. */static void napi_get_frags_check(struct napi_struct *napi){ struct sk_buff *skb;
local_bh_disable(); skb = napi_get_frags(napi); WARN_ON_ONCE(skb && skb->head_frag); napi_free_frags(napi); local_bh_enable();}
void netif_napi_add_weight_locked(struct net_device *dev, struct napi_struct *napi, int (*poll)(struct napi_struct *, int), int weight){ netdev_assert_locked(dev); if (WARN_ON(test_and_set_bit(NAPI_STATE_LISTED, &napi->state))) return;
INIT_LIST_HEAD(&napi->poll_list); INIT_HLIST_NODE(&napi->napi_hash_node); hrtimer_setup(&napi->timer, napi_watchdog, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED); gro_init(&napi->gro); napi->skb = NULL; napi->poll = poll; if (weight > NAPI_POLL_WEIGHT) netdev_err_once(dev, "%s() called with weight %d\n", __func__, weight); napi->weight = weight; napi->dev = dev;#ifdef CONFIG_NETPOLL napi->poll_owner = -1;#endif napi->list_owner = -1; set_bit(NAPI_STATE_SCHED, &napi->state); set_bit(NAPI_STATE_NPSVC, &napi->state); netif_napi_dev_list_add(dev, napi);
/* default settings from sysfs are applied to all NAPIs. any per-NAPI * configuration will be loaded in napi_enable */ napi_set_defer_hard_irqs(napi, READ_ONCE(dev->napi_defer_hard_irqs)); napi_set_gro_flush_timeout(napi, READ_ONCE(dev->gro_flush_timeout));
napi_get_frags_check(napi); /* Create kthread for this napi if dev->threaded is set. * Clear dev->threaded if kthread creation failed so that * threaded mode will not be enabled in napi_enable(). */ if (napi_get_threaded_config(dev, napi)) if (napi_kthread_create(napi)) dev->threaded = NETDEV_NAPI_THREADED_DISABLED; netif_napi_set_irq_locked(napi, -1);}EXPORT_SYMBOL(netif_napi_add_weight_locked);
void napi_disable_locked(struct napi_struct *n){ unsigned long val, new;
might_sleep(); netdev_assert_locked(n->dev);
set_bit(NAPI_STATE_DISABLE, &n->state);
val = READ_ONCE(n->state); do { while (val & (NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC)) { usleep_range(20, 200); val = READ_ONCE(n->state); }
new = val | NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC; new &= ~(NAPIF_STATE_THREADED | NAPIF_STATE_THREADED_BUSY_POLL | NAPIF_STATE_PREFER_BUSY_POLL); } while (!try_cmpxchg(&n->state, &val, new));
hrtimer_cancel(&n->timer);
if (n->config) napi_save_config(n); else napi_hash_del(n);
clear_bit(NAPI_STATE_DISABLE, &n->state);}EXPORT_SYMBOL(napi_disable_locked);
/** * napi_disable() - prevent NAPI from scheduling * @n: NAPI context * * Stop NAPI from being scheduled on this context. * Waits till any outstanding processing completes. * Takes netdev_lock() for associated net_device. */void napi_disable(struct napi_struct *n){ netdev_lock(n->dev); napi_disable_locked(n); netdev_unlock(n->dev);}EXPORT_SYMBOL(napi_disable);
void napi_enable_locked(struct napi_struct *n){ unsigned long new, val = READ_ONCE(n->state);
if (n->config) napi_restore_config(n); else napi_hash_add(n);
do { BUG_ON(!test_bit(NAPI_STATE_SCHED, &val));
new = val & ~(NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC); if (n->dev->threaded && n->thread) new |= NAPIF_STATE_THREADED; } while (!try_cmpxchg(&n->state, &val, new));}EXPORT_SYMBOL(napi_enable_locked);
/** * napi_enable() - enable NAPI scheduling * @n: NAPI context * * Enable scheduling of a NAPI instance. * Must be paired with napi_disable(). * Takes netdev_lock() for associated net_device. */void napi_enable(struct napi_struct *n){ netdev_lock(n->dev); napi_enable_locked(n); netdev_unlock(n->dev);}EXPORT_SYMBOL(napi_enable);
/* Must be called in process context */void __netif_napi_del_locked(struct napi_struct *napi){ netdev_assert_locked(napi->dev);
if (!test_and_clear_bit(NAPI_STATE_LISTED, &napi->state)) return;
/* Make sure NAPI is disabled (or was never enabled). */ WARN_ON(!test_bit(NAPI_STATE_SCHED, &napi->state));
if (test_and_clear_bit(NAPI_STATE_HAS_NOTIFIER, &napi->state)) irq_set_affinity_notifier(napi->irq, NULL);
if (napi->config) { napi->index = -1; napi->config = NULL; }
list_del_rcu(&napi->dev_list); napi_free_frags(napi);
gro_cleanup(&napi->gro);
if (napi->thread) { kthread_stop(napi->thread); napi->thread = NULL; }}EXPORT_SYMBOL(__netif_napi_del_locked);
static int __napi_poll(struct napi_struct *n, bool *repoll){ int work, weight;
weight = n->weight;
/* This NAPI_STATE_SCHED test is for avoiding a race * with netpoll's poll_napi(). Only the entity which * obtains the lock and sees NAPI_STATE_SCHED set will * actually make the ->poll() call. Therefore we avoid * accidentally calling ->poll() when NAPI is not scheduled. */ work = 0; if (napi_is_scheduled(n)) { work = n->poll(n, weight); trace_napi_poll(n, work, weight);
xdp_do_check_flushed(n); }
if (unlikely(work > weight)) netdev_err_once(n->dev, "NAPI poll function %pS returned %d, exceeding its budget of %d.\n", n->poll, work, weight);
if (likely(work < weight)) return work;
/* Drivers must not modify the NAPI state if they * consume the entire weight. In such cases this code * still "owns" the NAPI instance and therefore can * move the instance around on the list at-will. */ if (unlikely(napi_disable_pending(n))) { napi_complete(n); return work; }
/* The NAPI context has more processing work, but busy-polling * is preferred. Exit early. */ if (napi_prefer_busy_poll(n)) { if (napi_complete_done(n, work)) { /* If timeout is not set, we need to make sure * that the NAPI is re-scheduled. */ napi_schedule(n); } return work; }
/* Flush too old packets. If HZ < 1000, flush all packets */ gro_flush_normal(&n->gro, HZ >= 1000);
/* Some drivers may have called napi_schedule * prior to exhausting their budget. */ if (unlikely(!list_empty(&n->poll_list))) { pr_warn_once("%s: Budget exhausted after napi rescheduled\n", n->dev ? n->dev->name : "backlog"); return work; }
*repoll = true;
return work;}
static int napi_poll(struct napi_struct *n, struct list_head *repoll){ bool do_repoll = false; void *have; int work;
list_del_init(&n->poll_list);
have = netpoll_poll_lock(n);
work = __napi_poll(n, &do_repoll);
if (do_repoll) {#if defined(CONFIG_DEBUG_NET) if (unlikely(!napi_is_scheduled(n))) pr_crit("repoll requested for device %s %ps but napi is not scheduled.\n", n->dev->name, n->poll);#endif list_add_tail(&n->poll_list, repoll); } netpoll_poll_unlock(have);
return work;}
static int napi_thread_wait(struct napi_struct *napi){ set_current_state(TASK_INTERRUPTIBLE);
while (!kthread_should_stop()) { /* Testing SCHED_THREADED bit here to make sure the current * kthread owns this napi and could poll on this napi. * Testing SCHED bit is not enough because SCHED bit might be * set by some other busy poll thread or by napi_disable(). */ if (test_bit(NAPI_STATE_SCHED_THREADED, &napi->state)) { WARN_ON(!list_empty(&napi->poll_list)); __set_current_state(TASK_RUNNING); return 0; }
schedule(); set_current_state(TASK_INTERRUPTIBLE); } __set_current_state(TASK_RUNNING);
return -1;}
static void napi_threaded_poll_loop(struct napi_struct *napi, unsigned long *busy_poll_last_qs){ unsigned long last_qs = busy_poll_last_qs ? *busy_poll_last_qs : jiffies; struct bpf_net_context __bpf_net_ctx, *bpf_net_ctx; struct softnet_data *sd;
for (;;) { bool repoll = false; void *have;
local_bh_disable(); bpf_net_ctx = bpf_net_ctx_set(&__bpf_net_ctx);
sd = this_cpu_ptr(&softnet_data); sd->in_napi_threaded_poll = true;
have = netpoll_poll_lock(napi); __napi_poll(napi, &repoll); netpoll_poll_unlock(have);
sd->in_napi_threaded_poll = false; barrier();
if (sd_has_rps_ipi_waiting(sd)) { local_irq_disable(); net_rps_action_and_irq_enable(sd); } skb_defer_free_flush(); bpf_net_ctx_clear(bpf_net_ctx);
/* When busy poll is enabled, the old packets are not flushed in * napi_complete_done. So flush them here. */ if (busy_poll_last_qs) gro_flush_normal(&napi->gro, HZ >= 1000); local_bh_enable();
/* Call cond_resched here to avoid watchdog warnings. */ if (repoll || busy_poll_last_qs) { rcu_softirq_qs_periodic(last_qs); cond_resched(); }
if (!repoll) break; }
if (busy_poll_last_qs) *busy_poll_last_qs = last_qs;}
static int napi_threaded_poll(void *data){ struct napi_struct *napi = data; unsigned long last_qs = jiffies; bool want_busy_poll; bool in_busy_poll; unsigned long val;
while (!napi_thread_wait(napi)) { val = READ_ONCE(napi->state);
want_busy_poll = val & NAPIF_STATE_THREADED_BUSY_POLL; in_busy_poll = val & NAPIF_STATE_IN_BUSY_POLL;
if (unlikely(val & NAPIF_STATE_DISABLE)) want_busy_poll = false;
if (want_busy_poll != in_busy_poll) assign_bit(NAPI_STATE_IN_BUSY_POLL, &napi->state, want_busy_poll);
napi_threaded_poll_loop(napi, want_busy_poll ? &last_qs : NULL); }
return 0;}
static __latent_entropy void net_rx_action(void){ struct softnet_data *sd = this_cpu_ptr(&softnet_data); unsigned long time_limit = jiffies + usecs_to_jiffies(READ_ONCE(net_hotdata.netdev_budget_usecs)); struct bpf_net_context __bpf_net_ctx, *bpf_net_ctx; int budget = READ_ONCE(net_hotdata.netdev_budget); LIST_HEAD(list); LIST_HEAD(repoll);
bpf_net_ctx = bpf_net_ctx_set(&__bpf_net_ctx);start: sd->in_net_rx_action = true; local_irq_disable(); list_splice_init(&sd->poll_list, &list); local_irq_enable();
for (;;) { struct napi_struct *n;
skb_defer_free_flush();
if (list_empty(&list)) { if (list_empty(&repoll)) { sd->in_net_rx_action = false; barrier(); /* We need to check if ____napi_schedule() * had refilled poll_list while * sd->in_net_rx_action was true. */ if (!list_empty(&sd->poll_list)) goto start; if (!sd_has_rps_ipi_waiting(sd)) goto end; } break; }
n = list_first_entry(&list, struct napi_struct, poll_list); budget -= napi_poll(n, &repoll);
/* If softirq window is exhausted then punt. * Allow this to run for 2 jiffies since which will allow * an average latency of 1.5/HZ. */ if (unlikely(budget <= 0 || time_after_eq(jiffies, time_limit))) { /* Pairs with READ_ONCE() in softnet_seq_show() */ WRITE_ONCE(sd->time_squeeze, sd->time_squeeze + 1); break; } }
local_irq_disable();
list_splice_tail_init(&sd->poll_list, &list); list_splice_tail(&repoll, &list); list_splice(&list, &sd->poll_list); if (!list_empty(&sd->poll_list)) __raise_softirq_irqoff(NET_RX_SOFTIRQ); else sd->in_net_rx_action = false;
net_rps_action_and_irq_enable(sd);end: bpf_net_ctx_clear(bpf_net_ctx);}
struct netdev_adjacent { struct net_device *dev; netdevice_tracker dev_tracker;
/* upper master flag, there can only be one master device per list */ bool master;
/* lookup ignore flag */ bool ignore;
/* counter for the number of times this device was added to us */ u16 ref_nr;
/* private field for the users */ void *private;
struct list_head list; struct rcu_head rcu;};
static struct netdev_adjacent *__netdev_find_adj(struct net_device *adj_dev, struct list_head *adj_list){ struct netdev_adjacent *adj;
list_for_each_entry(adj, adj_list, list) { if (adj->dev == adj_dev) return adj; } return NULL;}
static int ____netdev_has_upper_dev(struct net_device *upper_dev, struct netdev_nested_priv *priv){ struct net_device *dev = (struct net_device *)priv->data;
return upper_dev == dev;}
/** * netdev_has_upper_dev - Check if device is linked to an upper device * @dev: device * @upper_dev: upper device to check * * Find out if a device is linked to specified upper device and return true * in case it is. Note that this checks only immediate upper device, * not through a complete stack of devices. The caller must hold the RTNL lock. */bool netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev){ struct netdev_nested_priv priv = { .data = (void *)upper_dev, };
ASSERT_RTNL();
return netdev_walk_all_upper_dev_rcu(dev, ____netdev_has_upper_dev, &priv);}EXPORT_SYMBOL(netdev_has_upper_dev);
/** * netdev_has_upper_dev_all_rcu - Check if device is linked to an upper device * @dev: device * @upper_dev: upper device to check * * Find out if a device is linked to specified upper device and return true * in case it is. Note that this checks the entire upper device chain. * The caller must hold rcu lock. */
bool netdev_has_upper_dev_all_rcu(struct net_device *dev, struct net_device *upper_dev){ struct netdev_nested_priv priv = { .data = (void *)upper_dev, };
return !!netdev_walk_all_upper_dev_rcu(dev, ____netdev_has_upper_dev, &priv);}EXPORT_SYMBOL(netdev_has_upper_dev_all_rcu);
/** * netdev_has_any_upper_dev - Check if device is linked to some device * @dev: device * * Find out if a device is linked to an upper device and return true in case * it is. The caller must hold the RTNL lock. */bool netdev_has_any_upper_dev(struct net_device *dev){ ASSERT_RTNL();
return !list_empty(&dev->adj_list.upper);}EXPORT_SYMBOL(netdev_has_any_upper_dev);
/** * netdev_master_upper_dev_get - Get master upper device * @dev: device * * Find a master upper device and return pointer to it or NULL in case * it's not there. The caller must hold the RTNL lock. */struct net_device *netdev_master_upper_dev_get(struct net_device *dev){ struct netdev_adjacent *upper;
ASSERT_RTNL();
if (list_empty(&dev->adj_list.upper)) return NULL;
upper = list_first_entry(&dev->adj_list.upper, struct netdev_adjacent, list); if (likely(upper->master)) return upper->dev; return NULL;}EXPORT_SYMBOL(netdev_master_upper_dev_get);
static struct net_device *__netdev_master_upper_dev_get(struct net_device *dev){ struct netdev_adjacent *upper;
ASSERT_RTNL();
if (list_empty(&dev->adj_list.upper)) return NULL;
upper = list_first_entry(&dev->adj_list.upper, struct netdev_adjacent, list); if (likely(upper->master) && !upper->ignore) return upper->dev; return NULL;}
/** * netdev_has_any_lower_dev - Check if device is linked to some device * @dev: device * * Find out if a device is linked to a lower device and return true in case * it is. The caller must hold the RTNL lock. */static bool netdev_has_any_lower_dev(struct net_device *dev){ ASSERT_RTNL();
return !list_empty(&dev->adj_list.lower);}
void *netdev_adjacent_get_private(struct list_head *adj_list){ struct netdev_adjacent *adj;
adj = list_entry(adj_list, struct netdev_adjacent, list);
return adj->private;}EXPORT_SYMBOL(netdev_adjacent_get_private);
/** * netdev_upper_get_next_dev_rcu - Get the next dev from upper list * @dev: device * @iter: list_head ** of the current position * * Gets the next device from the dev's upper list, starting from iter * position. The caller must hold RCU read lock. */struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, struct list_head **iter){ struct netdev_adjacent *upper;
WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_bh_held() && !lockdep_rtnl_is_held());
upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
if (&upper->list == &dev->adj_list.upper) return NULL;
*iter = &upper->list;
return upper->dev;}EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu);
static struct net_device *__netdev_next_upper_dev(struct net_device *dev, struct list_head **iter, bool *ignore){ struct netdev_adjacent *upper;
upper = list_entry((*iter)->next, struct netdev_adjacent, list);
if (&upper->list == &dev->adj_list.upper) return NULL;
*iter = &upper->list; *ignore = upper->ignore;
return upper->dev;}
static struct net_device *netdev_next_upper_dev_rcu(struct net_device *dev, struct list_head **iter){ struct netdev_adjacent *upper;
WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
if (&upper->list == &dev->adj_list.upper) return NULL;
*iter = &upper->list;
return upper->dev;}
static int __netdev_walk_all_upper_dev(struct net_device *dev, int (*fn)(struct net_device *dev, struct netdev_nested_priv *priv), struct netdev_nested_priv *priv){ struct net_device *udev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; int ret, cur = 0; bool ignore;
now = dev; iter = &dev->adj_list.upper;
while (1) { if (now != dev) { ret = fn(now, priv); if (ret) return ret; }
next = NULL; while (1) { udev = __netdev_next_upper_dev(now, &iter, &ignore); if (!udev) break; if (ignore) continue;
next = udev; niter = &udev->adj_list.upper; dev_stack[cur] = now; iter_stack[cur++] = iter; break; }
if (!next) { if (!cur) return 0; next = dev_stack[--cur]; niter = iter_stack[cur]; }
now = next; iter = niter; }
return 0;}
int netdev_walk_all_upper_dev_rcu(struct net_device *dev, int (*fn)(struct net_device *dev, struct netdev_nested_priv *priv), struct netdev_nested_priv *priv){ struct net_device *udev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; int ret, cur = 0;
now = dev; iter = &dev->adj_list.upper;
while (1) { if (now != dev) { ret = fn(now, priv); if (ret) return ret; }
next = NULL; while (1) { udev = netdev_next_upper_dev_rcu(now, &iter); if (!udev) break;
next = udev; niter = &udev->adj_list.upper; dev_stack[cur] = now; iter_stack[cur++] = iter; break; }
if (!next) { if (!cur) return 0; next = dev_stack[--cur]; niter = iter_stack[cur]; }
now = next; iter = niter; }
return 0;}EXPORT_SYMBOL_GPL(netdev_walk_all_upper_dev_rcu);
static bool __netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev){ struct netdev_nested_priv priv = { .flags = 0, .data = (void *)upper_dev, };
ASSERT_RTNL();
return __netdev_walk_all_upper_dev(dev, ____netdev_has_upper_dev, &priv);}
/** * netdev_lower_get_next_private - Get the next ->private from the * lower neighbour list * @dev: device * @iter: list_head ** of the current position * * Gets the next netdev_adjacent->private from the dev's lower neighbour * list, starting from iter position. The caller must hold either hold the * RTNL lock or its own locking that guarantees that the neighbour lower * list will remain unchanged. */void *netdev_lower_get_next_private(struct net_device *dev, struct list_head **iter){ struct netdev_adjacent *lower;
lower = list_entry(*iter, struct netdev_adjacent, list);
if (&lower->list == &dev->adj_list.lower) return NULL;
*iter = lower->list.next;
return lower->private;}EXPORT_SYMBOL(netdev_lower_get_next_private);
/** * netdev_lower_get_next_private_rcu - Get the next ->private from the * lower neighbour list, RCU * variant * @dev: device * @iter: list_head ** of the current position * * Gets the next netdev_adjacent->private from the dev's lower neighbour * list, starting from iter position. The caller must hold RCU read lock. */void *netdev_lower_get_next_private_rcu(struct net_device *dev, struct list_head **iter){ struct netdev_adjacent *lower;
WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_bh_held());
lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
if (&lower->list == &dev->adj_list.lower) return NULL;
*iter = &lower->list;
return lower->private;}EXPORT_SYMBOL(netdev_lower_get_next_private_rcu);
/** * netdev_lower_get_next - Get the next device from the lower neighbour * list * @dev: device * @iter: list_head ** of the current position * * Gets the next netdev_adjacent from the dev's lower neighbour * list, starting from iter position. The caller must hold RTNL lock or * its own locking that guarantees that the neighbour lower * list will remain unchanged. */void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter){ struct netdev_adjacent *lower;
lower = list_entry(*iter, struct netdev_adjacent, list);
if (&lower->list == &dev->adj_list.lower) return NULL;
*iter = lower->list.next;
return lower->dev;}EXPORT_SYMBOL(netdev_lower_get_next);
static struct net_device *netdev_next_lower_dev(struct net_device *dev, struct list_head **iter){ struct netdev_adjacent *lower;
lower = list_entry((*iter)->next, struct netdev_adjacent, list);
if (&lower->list == &dev->adj_list.lower) return NULL;
*iter = &lower->list;
return lower->dev;}
static struct net_device *__netdev_next_lower_dev(struct net_device *dev, struct list_head **iter, bool *ignore){ struct netdev_adjacent *lower;
lower = list_entry((*iter)->next, struct netdev_adjacent, list);
if (&lower->list == &dev->adj_list.lower) return NULL;
*iter = &lower->list; *ignore = lower->ignore;
return lower->dev;}
int netdev_walk_all_lower_dev(struct net_device *dev, int (*fn)(struct net_device *dev, struct netdev_nested_priv *priv), struct netdev_nested_priv *priv){ struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; int ret, cur = 0;
now = dev; iter = &dev->adj_list.lower;
while (1) { if (now != dev) { ret = fn(now, priv); if (ret) return ret; }
next = NULL; while (1) { ldev = netdev_next_lower_dev(now, &iter); if (!ldev) break;
next = ldev; niter = &ldev->adj_list.lower; dev_stack[cur] = now; iter_stack[cur++] = iter; break; }
if (!next) { if (!cur) return 0; next = dev_stack[--cur]; niter = iter_stack[cur]; }
now = next; iter = niter; }
return 0;}EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev);
static int __netdev_walk_all_lower_dev(struct net_device *dev, int (*fn)(struct net_device *dev, struct netdev_nested_priv *priv), struct netdev_nested_priv *priv){ struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; int ret, cur = 0; bool ignore;
now = dev; iter = &dev->adj_list.lower;
while (1) { if (now != dev) { ret = fn(now, priv); if (ret) return ret; }
next = NULL; while (1) { ldev = __netdev_next_lower_dev(now, &iter, &ignore); if (!ldev) break; if (ignore) continue;
next = ldev; niter = &ldev->adj_list.lower; dev_stack[cur] = now; iter_stack[cur++] = iter; break; }
if (!next) { if (!cur) return 0; next = dev_stack[--cur]; niter = iter_stack[cur]; }
now = next; iter = niter; }
return 0;}
struct net_device *netdev_next_lower_dev_rcu(struct net_device *dev, struct list_head **iter){ struct netdev_adjacent *lower;
lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); if (&lower->list == &dev->adj_list.lower) return NULL;
*iter = &lower->list;
return lower->dev;}EXPORT_SYMBOL(netdev_next_lower_dev_rcu);
static u8 __netdev_upper_depth(struct net_device *dev){ struct net_device *udev; struct list_head *iter; u8 max_depth = 0; bool ignore;
for (iter = &dev->adj_list.upper, udev = __netdev_next_upper_dev(dev, &iter, &ignore); udev; udev = __netdev_next_upper_dev(dev, &iter, &ignore)) { if (ignore) continue; if (max_depth < udev->upper_level) max_depth = udev->upper_level; }
return max_depth;}
static u8 __netdev_lower_depth(struct net_device *dev){ struct net_device *ldev; struct list_head *iter; u8 max_depth = 0; bool ignore;
for (iter = &dev->adj_list.lower, ldev = __netdev_next_lower_dev(dev, &iter, &ignore); ldev; ldev = __netdev_next_lower_dev(dev, &iter, &ignore)) { if (ignore) continue; if (max_depth < ldev->lower_level) max_depth = ldev->lower_level; }
return max_depth;}
static int __netdev_update_upper_level(struct net_device *dev, struct netdev_nested_priv *__unused){ dev->upper_level = __netdev_upper_depth(dev) + 1; return 0;}
#ifdef CONFIG_LOCKDEPstatic LIST_HEAD(net_unlink_list);
static void net_unlink_todo(struct net_device *dev){ if (list_empty(&dev->unlink_list)) list_add_tail(&dev->unlink_list, &net_unlink_list);}#endif
static int __netdev_update_lower_level(struct net_device *dev, struct netdev_nested_priv *priv){ dev->lower_level = __netdev_lower_depth(dev) + 1;
#ifdef CONFIG_LOCKDEP if (!priv) return 0;
if (priv->flags & NESTED_SYNC_IMM) dev->nested_level = dev->lower_level - 1; if (priv->flags & NESTED_SYNC_TODO) net_unlink_todo(dev);#endif return 0;}
int netdev_walk_all_lower_dev_rcu(struct net_device *dev, int (*fn)(struct net_device *dev, struct netdev_nested_priv *priv), struct netdev_nested_priv *priv){ struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; int ret, cur = 0;
now = dev; iter = &dev->adj_list.lower;
while (1) { if (now != dev) { ret = fn(now, priv); if (ret) return ret; }
next = NULL; while (1) { ldev = netdev_next_lower_dev_rcu(now, &iter); if (!ldev) break;
next = ldev; niter = &ldev->adj_list.lower; dev_stack[cur] = now; iter_stack[cur++] = iter; break; }
if (!next) { if (!cur) return 0; next = dev_stack[--cur]; niter = iter_stack[cur]; }
now = next; iter = niter; }
return 0;}EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev_rcu);
/** * netdev_lower_get_first_private_rcu - Get the first ->private from the * lower neighbour list, RCU * variant * @dev: device * * Gets the first netdev_adjacent->private from the dev's lower neighbour * list. The caller must hold RCU read lock. */void *netdev_lower_get_first_private_rcu(struct net_device *dev){ struct netdev_adjacent *lower;
lower = list_first_or_null_rcu(&dev->adj_list.lower, struct netdev_adjacent, list); if (lower) return lower->private; return NULL;}EXPORT_SYMBOL(netdev_lower_get_first_private_rcu);
/** * netdev_master_upper_dev_get_rcu - Get master upper device * @dev: device * * Find a master upper device and return pointer to it or NULL in case * it's not there. The caller must hold the RCU read lock. */struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev){ struct netdev_adjacent *upper;
upper = list_first_or_null_rcu(&dev->adj_list.upper, struct netdev_adjacent, list); if (upper && likely(upper->master)) return upper->dev; return NULL;}EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu);
static int netdev_adjacent_sysfs_add(struct net_device *dev, struct net_device *adj_dev, struct list_head *dev_list){ char linkname[IFNAMSIZ+7];
sprintf(linkname, dev_list == &dev->adj_list.upper ? "upper_%s" : "lower_%s", adj_dev->name); return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj), linkname);}static void netdev_adjacent_sysfs_del(struct net_device *dev, char *name, struct list_head *dev_list){ char linkname[IFNAMSIZ+7];
sprintf(linkname, dev_list == &dev->adj_list.upper ? "upper_%s" : "lower_%s", name); sysfs_remove_link(&(dev->dev.kobj), linkname);}
static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev, struct net_device *adj_dev, struct list_head *dev_list){ return (dev_list == &dev->adj_list.upper || dev_list == &dev->adj_list.lower) && net_eq(dev_net(dev), dev_net(adj_dev));}
static int __netdev_adjacent_dev_insert(struct net_device *dev, struct net_device *adj_dev, struct list_head *dev_list, void *private, bool master){ struct netdev_adjacent *adj; int ret;
adj = __netdev_find_adj(adj_dev, dev_list);
if (adj) { adj->ref_nr += 1; pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d\n", dev->name, adj_dev->name, adj->ref_nr);
return 0; }
adj = kmalloc_obj(*adj); if (!adj) return -ENOMEM;
adj->dev = adj_dev; adj->master = master; adj->ref_nr = 1; adj->private = private; adj->ignore = false; netdev_hold(adj_dev, &adj->dev_tracker, GFP_KERNEL);
pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d; dev_hold on %s\n", dev->name, adj_dev->name, adj->ref_nr, adj_dev->name);
if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) { ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list); if (ret) goto free_adj; }
/* Ensure that master link is always the first item in list. */ if (master) { ret = sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj), "master"); if (ret) goto remove_symlinks;
list_add_rcu(&adj->list, dev_list); } else { list_add_tail_rcu(&adj->list, dev_list); }
return 0;
remove_symlinks: if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);free_adj: netdev_put(adj_dev, &adj->dev_tracker); kfree(adj);
return ret;}
static void __netdev_adjacent_dev_remove(struct net_device *dev, struct net_device *adj_dev, u16 ref_nr, struct list_head *dev_list){ struct netdev_adjacent *adj;
pr_debug("Remove adjacency: dev %s adj_dev %s ref_nr %d\n", dev->name, adj_dev->name, ref_nr);
adj = __netdev_find_adj(adj_dev, dev_list);
if (!adj) { pr_err("Adjacency does not exist for device %s from %s\n", dev->name, adj_dev->name); WARN_ON(1); return; }
if (adj->ref_nr > ref_nr) { pr_debug("adjacency: %s to %s ref_nr - %d = %d\n", dev->name, adj_dev->name, ref_nr, adj->ref_nr - ref_nr); adj->ref_nr -= ref_nr; return; }
if (adj->master) sysfs_remove_link(&(dev->dev.kobj), "master");
if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
list_del_rcu(&adj->list); pr_debug("adjacency: dev_put for %s, because link removed from %s to %s\n", adj_dev->name, dev->name, adj_dev->name); netdev_put(adj_dev, &adj->dev_tracker); kfree_rcu(adj, rcu);}
static int __netdev_adjacent_dev_link_lists(struct net_device *dev, struct net_device *upper_dev, struct list_head *up_list, struct list_head *down_list, void *private, bool master){ int ret;
ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, private, master); if (ret) return ret;
ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, private, false); if (ret) { __netdev_adjacent_dev_remove(dev, upper_dev, 1, up_list); return ret; }
return 0;}
static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev, struct net_device *upper_dev, u16 ref_nr, struct list_head *up_list, struct list_head *down_list){ __netdev_adjacent_dev_remove(dev, upper_dev, ref_nr, up_list); __netdev_adjacent_dev_remove(upper_dev, dev, ref_nr, down_list);}
static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev, struct net_device *upper_dev, void *private, bool master){ return __netdev_adjacent_dev_link_lists(dev, upper_dev, &dev->adj_list.upper, &upper_dev->adj_list.lower, private, master);}
static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev, struct net_device *upper_dev){ __netdev_adjacent_dev_unlink_lists(dev, upper_dev, 1, &dev->adj_list.upper, &upper_dev->adj_list.lower);}
static int __netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev, bool master, void *upper_priv, void *upper_info, struct netdev_nested_priv *priv, struct netlink_ext_ack *extack){ struct netdev_notifier_changeupper_info changeupper_info = { .info = { .dev = dev, .extack = extack, }, .upper_dev = upper_dev, .master = master, .linking = true, .upper_info = upper_info, }; struct net_device *master_dev; int ret = 0;
ASSERT_RTNL();
if (dev == upper_dev) return -EBUSY;
/* To prevent loops, check if dev is not upper device to upper_dev. */ if (__netdev_has_upper_dev(upper_dev, dev)) return -EBUSY;
if ((dev->lower_level + upper_dev->upper_level) > MAX_NEST_DEV) return -EMLINK;
if (!master) { if (__netdev_has_upper_dev(dev, upper_dev)) return -EEXIST; } else { master_dev = __netdev_master_upper_dev_get(dev); if (master_dev) return master_dev == upper_dev ? -EEXIST : -EBUSY; }
ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, &changeupper_info.info); ret = notifier_to_errno(ret); if (ret) return ret;
ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, upper_priv, master); if (ret) return ret;
ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, &changeupper_info.info); ret = notifier_to_errno(ret); if (ret) goto rollback;
__netdev_update_upper_level(dev, NULL); __netdev_walk_all_lower_dev(dev, __netdev_update_upper_level, NULL);
__netdev_update_lower_level(upper_dev, priv); __netdev_walk_all_upper_dev(upper_dev, __netdev_update_lower_level, priv);
return 0;
rollback: __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
return ret;}
/** * netdev_upper_dev_link - Add a link to the upper device * @dev: device * @upper_dev: new upper device * @extack: netlink extended ack * * Adds a link to device which is upper to this one. The caller must hold * the RTNL lock. On a failure a negative errno code is returned. * On success the reference counts are adjusted and the function * returns zero. */int netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev, struct netlink_ext_ack *extack){ struct netdev_nested_priv priv = { .flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO, .data = NULL, };
return __netdev_upper_dev_link(dev, upper_dev, false, NULL, NULL, &priv, extack);}EXPORT_SYMBOL(netdev_upper_dev_link);
/** * netdev_master_upper_dev_link - Add a master link to the upper device * @dev: device * @upper_dev: new upper device * @upper_priv: upper device private * @upper_info: upper info to be passed down via notifier * @extack: netlink extended ack * * Adds a link to device which is upper to this one. In this case, only * one master upper device can be linked, although other non-master devices * might be linked as well. The caller must hold the RTNL lock. * On a failure a negative errno code is returned. On success the reference * counts are adjusted and the function returns zero. */int netdev_master_upper_dev_link(struct net_device *dev, struct net_device *upper_dev, void *upper_priv, void *upper_info, struct netlink_ext_ack *extack){ struct netdev_nested_priv priv = { .flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO, .data = NULL, };
return __netdev_upper_dev_link(dev, upper_dev, true, upper_priv, upper_info, &priv, extack);}EXPORT_SYMBOL(netdev_master_upper_dev_link);
static void __netdev_upper_dev_unlink(struct net_device *dev, struct net_device *upper_dev, struct netdev_nested_priv *priv){ struct netdev_notifier_changeupper_info changeupper_info = { .info = { .dev = dev, }, .upper_dev = upper_dev, .linking = false, };
ASSERT_RTNL();
changeupper_info.master = netdev_master_upper_dev_get(dev) == upper_dev;
call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, &changeupper_info.info);
__netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, &changeupper_info.info);
__netdev_update_upper_level(dev, NULL); __netdev_walk_all_lower_dev(dev, __netdev_update_upper_level, NULL);
__netdev_update_lower_level(upper_dev, priv); __netdev_walk_all_upper_dev(upper_dev, __netdev_update_lower_level, priv);}
/** * netdev_upper_dev_unlink - Removes a link to upper device * @dev: device * @upper_dev: new upper device * * Removes a link to device which is upper to this one. The caller must hold * the RTNL lock. */void netdev_upper_dev_unlink(struct net_device *dev, struct net_device *upper_dev){ struct netdev_nested_priv priv = { .flags = NESTED_SYNC_TODO, .data = NULL, };
__netdev_upper_dev_unlink(dev, upper_dev, &priv);}EXPORT_SYMBOL(netdev_upper_dev_unlink);
static void __netdev_adjacent_dev_set(struct net_device *upper_dev, struct net_device *lower_dev, bool val){ struct netdev_adjacent *adj;
adj = __netdev_find_adj(lower_dev, &upper_dev->adj_list.lower); if (adj) adj->ignore = val;
adj = __netdev_find_adj(upper_dev, &lower_dev->adj_list.upper); if (adj) adj->ignore = val;}
static void netdev_adjacent_dev_disable(struct net_device *upper_dev, struct net_device *lower_dev){ __netdev_adjacent_dev_set(upper_dev, lower_dev, true);}
static void netdev_adjacent_dev_enable(struct net_device *upper_dev, struct net_device *lower_dev){ __netdev_adjacent_dev_set(upper_dev, lower_dev, false);}
int netdev_adjacent_change_prepare(struct net_device *old_dev, struct net_device *new_dev, struct net_device *dev, struct netlink_ext_ack *extack){ struct netdev_nested_priv priv = { .flags = 0, .data = NULL, }; int err;
if (!new_dev) return 0;
if (old_dev && new_dev != old_dev) netdev_adjacent_dev_disable(dev, old_dev); err = __netdev_upper_dev_link(new_dev, dev, false, NULL, NULL, &priv, extack); if (err) { if (old_dev && new_dev != old_dev) netdev_adjacent_dev_enable(dev, old_dev); return err; }
return 0;}EXPORT_SYMBOL(netdev_adjacent_change_prepare);
void netdev_adjacent_change_commit(struct net_device *old_dev, struct net_device *new_dev, struct net_device *dev){ struct netdev_nested_priv priv = { .flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO, .data = NULL, };
if (!new_dev || !old_dev) return;
if (new_dev == old_dev) return;
netdev_adjacent_dev_enable(dev, old_dev); __netdev_upper_dev_unlink(old_dev, dev, &priv);}EXPORT_SYMBOL(netdev_adjacent_change_commit);
void netdev_adjacent_change_abort(struct net_device *old_dev, struct net_device *new_dev, struct net_device *dev){ struct netdev_nested_priv priv = { .flags = 0, .data = NULL, };
if (!new_dev) return;
if (old_dev && new_dev != old_dev) netdev_adjacent_dev_enable(dev, old_dev);
__netdev_upper_dev_unlink(new_dev, dev, &priv);}EXPORT_SYMBOL(netdev_adjacent_change_abort);
/** * netdev_bonding_info_change - Dispatch event about slave change * @dev: device * @bonding_info: info to dispatch * * Send NETDEV_BONDING_INFO to netdev notifiers with info. * The caller must hold the RTNL lock. */void netdev_bonding_info_change(struct net_device *dev, struct netdev_bonding_info *bonding_info){ struct netdev_notifier_bonding_info info = { .info.dev = dev, };
memcpy(&info.bonding_info, bonding_info, sizeof(struct netdev_bonding_info)); call_netdevice_notifiers_info(NETDEV_BONDING_INFO, &info.info);}EXPORT_SYMBOL(netdev_bonding_info_change);
static int netdev_offload_xstats_enable_l3(struct net_device *dev, struct netlink_ext_ack *extack){ struct netdev_notifier_offload_xstats_info info = { .info.dev = dev, .info.extack = extack, .type = NETDEV_OFFLOAD_XSTATS_TYPE_L3, }; int err; int rc;
dev->offload_xstats_l3 = kzalloc_obj(*dev->offload_xstats_l3); if (!dev->offload_xstats_l3) return -ENOMEM;
rc = call_netdevice_notifiers_info_robust(NETDEV_OFFLOAD_XSTATS_ENABLE, NETDEV_OFFLOAD_XSTATS_DISABLE, &info.info); err = notifier_to_errno(rc); if (err) goto free_stats;
return 0;
free_stats: kfree(dev->offload_xstats_l3); dev->offload_xstats_l3 = NULL; return err;}
int netdev_offload_xstats_enable(struct net_device *dev, enum netdev_offload_xstats_type type, struct netlink_ext_ack *extack){ ASSERT_RTNL();
if (netdev_offload_xstats_enabled(dev, type)) return -EALREADY;
switch (type) { case NETDEV_OFFLOAD_XSTATS_TYPE_L3: return netdev_offload_xstats_enable_l3(dev, extack); }
WARN_ON(1); return -EINVAL;}EXPORT_SYMBOL(netdev_offload_xstats_enable);
static void netdev_offload_xstats_disable_l3(struct net_device *dev){ struct netdev_notifier_offload_xstats_info info = { .info.dev = dev, .type = NETDEV_OFFLOAD_XSTATS_TYPE_L3, };
call_netdevice_notifiers_info(NETDEV_OFFLOAD_XSTATS_DISABLE, &info.info); kfree(dev->offload_xstats_l3); dev->offload_xstats_l3 = NULL;}
int netdev_offload_xstats_disable(struct net_device *dev, enum netdev_offload_xstats_type type){ ASSERT_RTNL();
if (!netdev_offload_xstats_enabled(dev, type)) return -EALREADY;
switch (type) { case NETDEV_OFFLOAD_XSTATS_TYPE_L3: netdev_offload_xstats_disable_l3(dev); return 0; }
WARN_ON(1); return -EINVAL;}EXPORT_SYMBOL(netdev_offload_xstats_disable);
static void netdev_offload_xstats_disable_all(struct net_device *dev){ netdev_offload_xstats_disable(dev, NETDEV_OFFLOAD_XSTATS_TYPE_L3);}
static struct rtnl_hw_stats64 *netdev_offload_xstats_get_ptr(const struct net_device *dev, enum netdev_offload_xstats_type type){ switch (type) { case NETDEV_OFFLOAD_XSTATS_TYPE_L3: return dev->offload_xstats_l3; }
WARN_ON(1); return NULL;}
bool netdev_offload_xstats_enabled(const struct net_device *dev, enum netdev_offload_xstats_type type){ ASSERT_RTNL();
return netdev_offload_xstats_get_ptr(dev, type);}EXPORT_SYMBOL(netdev_offload_xstats_enabled);
struct netdev_notifier_offload_xstats_ru { bool used;};
struct netdev_notifier_offload_xstats_rd { struct rtnl_hw_stats64 stats; bool used;};
static void netdev_hw_stats64_add(struct rtnl_hw_stats64 *dest, const struct rtnl_hw_stats64 *src){ dest->rx_packets += src->rx_packets; dest->tx_packets += src->tx_packets; dest->rx_bytes += src->rx_bytes; dest->tx_bytes += src->tx_bytes; dest->rx_errors += src->rx_errors; dest->tx_errors += src->tx_errors; dest->rx_dropped += src->rx_dropped; dest->tx_dropped += src->tx_dropped; dest->multicast += src->multicast;}
static int netdev_offload_xstats_get_used(struct net_device *dev, enum netdev_offload_xstats_type type, bool *p_used, struct netlink_ext_ack *extack){ struct netdev_notifier_offload_xstats_ru report_used = {}; struct netdev_notifier_offload_xstats_info info = { .info.dev = dev, .info.extack = extack, .type = type, .report_used = &report_used, }; int rc;
WARN_ON(!netdev_offload_xstats_enabled(dev, type)); rc = call_netdevice_notifiers_info(NETDEV_OFFLOAD_XSTATS_REPORT_USED, &info.info); *p_used = report_used.used; return notifier_to_errno(rc);}
static int netdev_offload_xstats_get_stats(struct net_device *dev, enum netdev_offload_xstats_type type, struct rtnl_hw_stats64 *p_stats, bool *p_used, struct netlink_ext_ack *extack){ struct netdev_notifier_offload_xstats_rd report_delta = {}; struct netdev_notifier_offload_xstats_info info = { .info.dev = dev, .info.extack = extack, .type = type, .report_delta = &report_delta, }; struct rtnl_hw_stats64 *stats; int rc;
stats = netdev_offload_xstats_get_ptr(dev, type); if (WARN_ON(!stats)) return -EINVAL;
rc = call_netdevice_notifiers_info(NETDEV_OFFLOAD_XSTATS_REPORT_DELTA, &info.info);
/* Cache whatever we got, even if there was an error, otherwise the * successful stats retrievals would get lost. */ netdev_hw_stats64_add(stats, &report_delta.stats);
if (p_stats) *p_stats = *stats; *p_used = report_delta.used;
return notifier_to_errno(rc);}
int netdev_offload_xstats_get(struct net_device *dev, enum netdev_offload_xstats_type type, struct rtnl_hw_stats64 *p_stats, bool *p_used, struct netlink_ext_ack *extack){ ASSERT_RTNL();
if (p_stats) return netdev_offload_xstats_get_stats(dev, type, p_stats, p_used, extack); else return netdev_offload_xstats_get_used(dev, type, p_used, extack);}EXPORT_SYMBOL(netdev_offload_xstats_get);
voidnetdev_offload_xstats_report_delta(struct netdev_notifier_offload_xstats_rd *report_delta, const struct rtnl_hw_stats64 *stats){ report_delta->used = true; netdev_hw_stats64_add(&report_delta->stats, stats);}EXPORT_SYMBOL(netdev_offload_xstats_report_delta);
voidnetdev_offload_xstats_report_used(struct netdev_notifier_offload_xstats_ru *report_used){ report_used->used = true;}EXPORT_SYMBOL(netdev_offload_xstats_report_used);
void netdev_offload_xstats_push_delta(struct net_device *dev, enum netdev_offload_xstats_type type, const struct rtnl_hw_stats64 *p_stats){ struct rtnl_hw_stats64 *stats;
ASSERT_RTNL();
stats = netdev_offload_xstats_get_ptr(dev, type); if (WARN_ON(!stats)) return;
netdev_hw_stats64_add(stats, p_stats);}EXPORT_SYMBOL(netdev_offload_xstats_push_delta);
/** * netdev_get_xmit_slave - Get the xmit slave of master device * @dev: device * @skb: The packet * @all_slaves: assume all the slaves are active * * The reference counters are not incremented so the caller must be * careful with locks. The caller must hold RCU lock. * %NULL is returned if no slave is found. */
struct net_device *netdev_get_xmit_slave(struct net_device *dev, struct sk_buff *skb, bool all_slaves){ const struct net_device_ops *ops = dev->netdev_ops;
if (!ops->ndo_get_xmit_slave) return NULL; return ops->ndo_get_xmit_slave(dev, skb, all_slaves);}EXPORT_SYMBOL(netdev_get_xmit_slave);
static struct net_device *netdev_sk_get_lower_dev(struct net_device *dev, struct sock *sk){ const struct net_device_ops *ops = dev->netdev_ops;
if (!ops->ndo_sk_get_lower_dev) return NULL; return ops->ndo_sk_get_lower_dev(dev, sk);}
/** * netdev_sk_get_lowest_dev - Get the lowest device in chain given device and socket * @dev: device * @sk: the socket * * %NULL is returned if no lower device is found. */
struct net_device *netdev_sk_get_lowest_dev(struct net_device *dev, struct sock *sk){ struct net_device *lower;
lower = netdev_sk_get_lower_dev(dev, sk); while (lower) { dev = lower; lower = netdev_sk_get_lower_dev(dev, sk); }
return dev;}EXPORT_SYMBOL(netdev_sk_get_lowest_dev);
static void netdev_adjacent_add_links(struct net_device *dev){ struct netdev_adjacent *iter;
struct net *net = dev_net(dev);
list_for_each_entry(iter, &dev->adj_list.upper, list) { if (!net_eq(net, dev_net(iter->dev))) continue; netdev_adjacent_sysfs_add(iter->dev, dev, &iter->dev->adj_list.lower); netdev_adjacent_sysfs_add(dev, iter->dev, &dev->adj_list.upper); }
list_for_each_entry(iter, &dev->adj_list.lower, list) { if (!net_eq(net, dev_net(iter->dev))) continue; netdev_adjacent_sysfs_add(iter->dev, dev, &iter->dev->adj_list.upper); netdev_adjacent_sysfs_add(dev, iter->dev, &dev->adj_list.lower); }}
static void netdev_adjacent_del_links(struct net_device *dev){ struct netdev_adjacent *iter;
struct net *net = dev_net(dev);
list_for_each_entry(iter, &dev->adj_list.upper, list) { if (!net_eq(net, dev_net(iter->dev))) continue; netdev_adjacent_sysfs_del(iter->dev, dev->name, &iter->dev->adj_list.lower); netdev_adjacent_sysfs_del(dev, iter->dev->name, &dev->adj_list.upper); }
list_for_each_entry(iter, &dev->adj_list.lower, list) { if (!net_eq(net, dev_net(iter->dev))) continue; netdev_adjacent_sysfs_del(iter->dev, dev->name, &iter->dev->adj_list.upper); netdev_adjacent_sysfs_del(dev, iter->dev->name, &dev->adj_list.lower); }}
void netdev_adjacent_rename_links(struct net_device *dev, char *oldname){ struct netdev_adjacent *iter;
struct net *net = dev_net(dev);
list_for_each_entry(iter, &dev->adj_list.upper, list) { if (!net_eq(net, dev_net(iter->dev))) continue; netdev_adjacent_sysfs_del(iter->dev, oldname, &iter->dev->adj_list.lower); netdev_adjacent_sysfs_add(iter->dev, dev, &iter->dev->adj_list.lower); }
list_for_each_entry(iter, &dev->adj_list.lower, list) { if (!net_eq(net, dev_net(iter->dev))) continue; netdev_adjacent_sysfs_del(iter->dev, oldname, &iter->dev->adj_list.upper); netdev_adjacent_sysfs_add(iter->dev, dev, &iter->dev->adj_list.upper); }}
void *netdev_lower_dev_get_private(struct net_device *dev, struct net_device *lower_dev){ struct netdev_adjacent *lower;
if (!lower_dev) return NULL; lower = __netdev_find_adj(lower_dev, &dev->adj_list.lower); if (!lower) return NULL;
return lower->private;}EXPORT_SYMBOL(netdev_lower_dev_get_private);
/** * netdev_lower_state_changed - Dispatch event about lower device state change * @lower_dev: device * @lower_state_info: state to dispatch * * Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info. * The caller must hold the RTNL lock. */void netdev_lower_state_changed(struct net_device *lower_dev, void *lower_state_info){ struct netdev_notifier_changelowerstate_info changelowerstate_info = { .info.dev = lower_dev, };
ASSERT_RTNL(); changelowerstate_info.lower_state_info = lower_state_info; call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE, &changelowerstate_info.info);}EXPORT_SYMBOL(netdev_lower_state_changed);
static void dev_change_rx_flags(struct net_device *dev, int flags){ const struct net_device_ops *ops = dev->netdev_ops;
if (ops->ndo_change_rx_flags) ops->ndo_change_rx_flags(dev, flags);}
int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify){ unsigned int old_flags = dev->flags; unsigned int promiscuity, flags; kuid_t uid; kgid_t gid;
netdev_assert_locked_ops_compat(dev);
promiscuity = dev->promiscuity + inc; if (promiscuity == 0) { /* * Avoid overflow. * If inc causes overflow, untouch promisc and return error. */ if (unlikely(inc > 0)) { netdev_warn(dev, "promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n"); return -EOVERFLOW; } flags = old_flags & ~IFF_PROMISC; } else { flags = old_flags | IFF_PROMISC; } WRITE_ONCE(dev->promiscuity, promiscuity); if (flags != old_flags) { WRITE_ONCE(dev->flags, flags); netdev_info(dev, "%s promiscuous mode\n", dev->flags & IFF_PROMISC ? "entered" : "left"); if (audit_enabled) { current_uid_gid(&uid, &gid); audit_log(audit_context(), GFP_ATOMIC, AUDIT_ANOM_PROMISCUOUS, "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", dev->name, (dev->flags & IFF_PROMISC), (old_flags & IFF_PROMISC), from_kuid(&init_user_ns, audit_get_loginuid(current)), from_kuid(&init_user_ns, uid), from_kgid(&init_user_ns, gid), audit_get_sessionid(current)); }
dev_change_rx_flags(dev, IFF_PROMISC); } if (notify) __dev_notify_flags(dev, old_flags, IFF_PROMISC, 0, NULL); return 0;}
int netif_set_promiscuity(struct net_device *dev, int inc){ unsigned int old_flags = dev->flags; int err;
err = __dev_set_promiscuity(dev, inc, true); if (err < 0) return err; if (dev->flags != old_flags) dev_set_rx_mode(dev); return err;}
int netif_set_allmulti(struct net_device *dev, int inc, bool notify){ unsigned int old_flags = dev->flags, old_gflags = dev->gflags; unsigned int allmulti, flags;
netdev_assert_locked_ops_compat(dev);
allmulti = dev->allmulti + inc; if (allmulti == 0) { /* * Avoid overflow. * If inc causes overflow, untouch allmulti and return error. */ if (unlikely(inc > 0)) { netdev_warn(dev, "allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n"); return -EOVERFLOW; } flags = old_flags & ~IFF_ALLMULTI; } else { flags = old_flags | IFF_ALLMULTI; } WRITE_ONCE(dev->allmulti, allmulti); if (flags != old_flags) { WRITE_ONCE(dev->flags, flags); netdev_info(dev, "%s allmulticast mode\n", dev->flags & IFF_ALLMULTI ? "entered" : "left"); dev_change_rx_flags(dev, IFF_ALLMULTI); dev_set_rx_mode(dev); if (notify) __dev_notify_flags(dev, old_flags, dev->gflags ^ old_gflags, 0, NULL); } return 0;}
/** * netif_get_flags() - get flags reported to userspace * @dev: device * * Get the combination of flag bits exported through APIs to userspace. */unsigned int netif_get_flags(const struct net_device *dev){ unsigned int flags;
flags = (READ_ONCE(dev->flags) & ~(IFF_PROMISC | IFF_ALLMULTI | IFF_RUNNING | IFF_LOWER_UP | IFF_DORMANT)) | (READ_ONCE(dev->gflags) & (IFF_PROMISC | IFF_ALLMULTI));
if (netif_running(dev)) { if (netif_oper_up(dev)) flags |= IFF_RUNNING; if (netif_carrier_ok(dev)) flags |= IFF_LOWER_UP; if (netif_dormant(dev)) flags |= IFF_DORMANT; }
return flags;}EXPORT_SYMBOL(netif_get_flags);
int __dev_change_flags(struct net_device *dev, unsigned int flags, struct netlink_ext_ack *extack){ unsigned int old_flags = dev->flags; int ret;
netdev_assert_locked_ops_compat(dev);
/* * Set the flags on our device. */
dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | IFF_AUTOMEDIA)) | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | IFF_ALLMULTI));
/* * Load in the correct multicast list now the flags have changed. */
if ((old_flags ^ flags) & IFF_MULTICAST) dev_change_rx_flags(dev, IFF_MULTICAST);
dev_set_rx_mode(dev);
/* * Have we downed the interface. We handle IFF_UP ourselves * according to user attempts to set it, rather than blindly * setting it. */
ret = 0; if ((old_flags ^ flags) & IFF_UP) { if (old_flags & IFF_UP) __dev_close(dev); else ret = __dev_open(dev, extack); }
if ((flags ^ dev->gflags) & IFF_PROMISC) { int inc = (flags & IFF_PROMISC) ? 1 : -1; old_flags = dev->flags;
dev->gflags ^= IFF_PROMISC;
if (__dev_set_promiscuity(dev, inc, false) >= 0) if (dev->flags != old_flags) dev_set_rx_mode(dev); }
/* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI * is important. Some (broken) drivers set IFF_PROMISC, when * IFF_ALLMULTI is requested not asking us and not reporting. */ if ((flags ^ dev->gflags) & IFF_ALLMULTI) { int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
dev->gflags ^= IFF_ALLMULTI; netif_set_allmulti(dev, inc, false); }
return ret;}
void __dev_notify_flags(struct net_device *dev, unsigned int old_flags, unsigned int gchanges, u32 portid, const struct nlmsghdr *nlh){ unsigned int changes = dev->flags ^ old_flags;
netdev_assert_locked_ops_compat(dev);
if (gchanges) rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC, portid, nlh);
if (changes & IFF_UP) { if (dev->flags & IFF_UP) call_netdevice_notifiers(NETDEV_UP, dev); else call_netdevice_notifiers(NETDEV_DOWN, dev); }
if (dev->flags & IFF_UP && (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) { struct netdev_notifier_change_info change_info = { .info = { .dev = dev, }, .flags_changed = changes, };
call_netdevice_notifiers_info(NETDEV_CHANGE, &change_info.info); }}
int netif_change_flags(struct net_device *dev, unsigned int flags, struct netlink_ext_ack *extack){ int ret; unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags;
ret = __dev_change_flags(dev, flags, extack); if (ret < 0) return ret;
changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags); __dev_notify_flags(dev, old_flags, changes, 0, NULL); return ret;}EXPORT_SYMBOL(netif_change_flags);
int __netif_set_mtu(struct net_device *dev, int new_mtu){ const struct net_device_ops *ops = dev->netdev_ops;
if (ops->ndo_change_mtu) return ops->ndo_change_mtu(dev, new_mtu);
/* Pairs with all the lockless reads of dev->mtu in the stack */ WRITE_ONCE(dev->mtu, new_mtu); return 0;}EXPORT_SYMBOL_NS_GPL(__netif_set_mtu, "NETDEV_INTERNAL");
int dev_validate_mtu(struct net_device *dev, int new_mtu, struct netlink_ext_ack *extack){ /* MTU must be positive, and in range */ if (new_mtu < 0 || new_mtu < dev->min_mtu) { NL_SET_ERR_MSG(extack, "mtu less than device minimum"); return -EINVAL; }
if (dev->max_mtu > 0 && new_mtu > dev->max_mtu) { NL_SET_ERR_MSG(extack, "mtu greater than device maximum"); return -EINVAL; } return 0;}
/** * netif_set_mtu_ext() - Change maximum transfer unit * @dev: device * @new_mtu: new transfer unit * @extack: netlink extended ack * * Change the maximum transfer size of the network device. * * Return: 0 on success, -errno on failure. */int netif_set_mtu_ext(struct net_device *dev, int new_mtu, struct netlink_ext_ack *extack){ int err, orig_mtu;
netdev_assert_locked_ops_compat(dev);
if (new_mtu == dev->mtu) return 0;
err = dev_validate_mtu(dev, new_mtu, extack); if (err) return err;
if (!netif_device_present(dev)) return -ENODEV;
err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev); err = notifier_to_errno(err); if (err) return err;
orig_mtu = dev->mtu; err = __netif_set_mtu(dev, new_mtu);
if (!err) { err = call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev, orig_mtu); err = notifier_to_errno(err); if (err) { /* setting mtu back and notifying everyone again, * so that they have a chance to revert changes. */ __netif_set_mtu(dev, orig_mtu); call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev, new_mtu); } } return err;}
int netif_set_mtu(struct net_device *dev, int new_mtu){ struct netlink_ext_ack extack; int err;
memset(&extack, 0, sizeof(extack)); err = netif_set_mtu_ext(dev, new_mtu, &extack); if (err && extack._msg) net_err_ratelimited("%s: %s\n", dev->name, extack._msg); return err;}EXPORT_SYMBOL(netif_set_mtu);
int netif_change_tx_queue_len(struct net_device *dev, unsigned long new_len){ unsigned int orig_len = dev->tx_queue_len; int res;
if (new_len > S16_MAX) return -ERANGE;
if (new_len != orig_len) { WRITE_ONCE(dev->tx_queue_len, new_len); res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev); res = notifier_to_errno(res); if (res) goto err_rollback; res = dev_qdisc_change_tx_queue_len(dev); if (res) goto err_rollback; }
return 0;
err_rollback: netdev_err(dev, "refused to change device tx_queue_len\n"); WRITE_ONCE(dev->tx_queue_len, orig_len); return res;}
void netif_set_group(struct net_device *dev, int new_group){ dev->group = new_group;}
/** * netif_pre_changeaddr_notify() - Call NETDEV_PRE_CHANGEADDR. * @dev: device * @addr: new address * @extack: netlink extended ack * * Return: 0 on success, -errno on failure. */int netif_pre_changeaddr_notify(struct net_device *dev, const char *addr, struct netlink_ext_ack *extack){ struct netdev_notifier_pre_changeaddr_info info = { .info.dev = dev, .info.extack = extack, .dev_addr = addr, }; int rc;
rc = call_netdevice_notifiers_info(NETDEV_PRE_CHANGEADDR, &info.info); return notifier_to_errno(rc);}EXPORT_SYMBOL_NS_GPL(netif_pre_changeaddr_notify, "NETDEV_INTERNAL");
int netif_set_mac_address(struct net_device *dev, struct sockaddr_storage *ss, struct netlink_ext_ack *extack){ const struct net_device_ops *ops = dev->netdev_ops; int err;
if (!ops->ndo_set_mac_address) return -EOPNOTSUPP; if (ss->ss_family != dev->type) return -EINVAL; if (!netif_device_present(dev)) return -ENODEV; err = netif_pre_changeaddr_notify(dev, ss->__data, extack); if (err) return err; if (memcmp(dev->dev_addr, ss->__data, dev->addr_len)) { err = ops->ndo_set_mac_address(dev, ss); if (err) return err; } dev->addr_assign_type = NET_ADDR_SET; call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); add_device_randomness(dev->dev_addr, dev->addr_len); return 0;}
DECLARE_RWSEM(dev_addr_sem);
/* "sa" is a true struct sockaddr with limited "sa_data" member. */int netif_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name){ size_t size = sizeof(sa->sa_data); struct net_device *dev; int ret = 0;
down_read(&dev_addr_sem); rcu_read_lock();
dev = dev_get_by_name_rcu(net, dev_name); if (!dev) { ret = -ENODEV; goto unlock; } if (!dev->addr_len) memset(sa->sa_data, 0, size); else memcpy(sa->sa_data, dev->dev_addr, min_t(size_t, size, dev->addr_len)); sa->sa_family = dev->type;
unlock: rcu_read_unlock(); up_read(&dev_addr_sem); return ret;}EXPORT_SYMBOL_NS_GPL(netif_get_mac_address, "NETDEV_INTERNAL");
int netif_change_carrier(struct net_device *dev, bool new_carrier){ const struct net_device_ops *ops = dev->netdev_ops;
if (!ops->ndo_change_carrier) return -EOPNOTSUPP; if (!netif_device_present(dev)) return -ENODEV; return ops->ndo_change_carrier(dev, new_carrier);}
/** * dev_get_phys_port_id - Get device physical port ID * @dev: device * @ppid: port ID * * Get device physical port ID */int dev_get_phys_port_id(struct net_device *dev, struct netdev_phys_item_id *ppid){ const struct net_device_ops *ops = dev->netdev_ops;
if (!ops->ndo_get_phys_port_id) return -EOPNOTSUPP; return ops->ndo_get_phys_port_id(dev, ppid);}
/** * dev_get_phys_port_name - Get device physical port name * @dev: device * @name: port name * @len: limit of bytes to copy to name * * Get device physical port name */int dev_get_phys_port_name(struct net_device *dev, char *name, size_t len){ const struct net_device_ops *ops = dev->netdev_ops; int err;
if (ops->ndo_get_phys_port_name) { err = ops->ndo_get_phys_port_name(dev, name, len); if (err != -EOPNOTSUPP) return err; } return devlink_compat_phys_port_name_get(dev, name, len);}
/** * netif_get_port_parent_id() - Get the device's port parent identifier * @dev: network device * @ppid: pointer to a storage for the port's parent identifier * @recurse: allow/disallow recursion to lower devices * * Get the devices's port parent identifier. * * Return: 0 on success, -errno on failure. */int netif_get_port_parent_id(struct net_device *dev, struct netdev_phys_item_id *ppid, bool recurse){ const struct net_device_ops *ops = dev->netdev_ops; struct netdev_phys_item_id first = { }; struct net_device *lower_dev; struct list_head *iter; int err;
if (ops->ndo_get_port_parent_id) { err = ops->ndo_get_port_parent_id(dev, ppid); if (err != -EOPNOTSUPP) return err; }
err = devlink_compat_switch_id_get(dev, ppid); if (!recurse || err != -EOPNOTSUPP) return err;
netdev_for_each_lower_dev(dev, lower_dev, iter) { err = netif_get_port_parent_id(lower_dev, ppid, true); if (err) break; if (!first.id_len) first = *ppid; else if (memcmp(&first, ppid, sizeof(*ppid))) return -EOPNOTSUPP; }
return err;}EXPORT_SYMBOL(netif_get_port_parent_id);
/** * netdev_port_same_parent_id - Indicate if two network devices have * the same port parent identifier * @a: first network device * @b: second network device */bool netdev_port_same_parent_id(struct net_device *a, struct net_device *b){ struct netdev_phys_item_id a_id = { }; struct netdev_phys_item_id b_id = { };
if (netif_get_port_parent_id(a, &a_id, true) || netif_get_port_parent_id(b, &b_id, true)) return false;
return netdev_phys_item_id_same(&a_id, &b_id);}EXPORT_SYMBOL(netdev_port_same_parent_id);
static struct net_device *dev_get_iflink_dev(struct net_device *dev){ struct net *net;
ASSERT_RTNL();
if (!dev->netdev_ops->ndo_get_iflink || !dev->rtnl_link_ops || !dev->rtnl_link_ops->get_link_net) return dev;
net = dev->rtnl_link_ops->get_link_net(dev); return __dev_get_by_index(net, dev_get_iflink(dev));}
int netif_change_proto_down(struct net_device *dev, bool proto_down){ struct net_device *iflink_dev;
if (!dev->change_proto_down) return -EOPNOTSUPP; if (!netif_device_present(dev)) return -ENODEV; iflink_dev = dev_get_iflink_dev(dev); if (!iflink_dev) return -ENODEV; WRITE_ONCE(dev->proto_down, proto_down); if (proto_down) netif_carrier_off(dev); else if (dev == iflink_dev || netif_carrier_ok(iflink_dev)) netif_carrier_on(dev); return 0;}
/** * netdev_change_proto_down_reason_locked - proto down reason * * @dev: device * @mask: proto down mask * @value: proto down value */void netdev_change_proto_down_reason_locked(struct net_device *dev, unsigned long mask, u32 value){ u32 proto_down_reason; int b;
if (!mask) { proto_down_reason = value; } else { proto_down_reason = dev->proto_down_reason; for_each_set_bit(b, &mask, 32) { if (value & (1 << b)) proto_down_reason |= BIT(b); else proto_down_reason &= ~BIT(b); } } WRITE_ONCE(dev->proto_down_reason, proto_down_reason);}
struct bpf_xdp_link { struct bpf_link link; struct net_device *dev; /* protected by rtnl_lock, no refcnt held */ int flags;};
static enum bpf_xdp_mode dev_xdp_mode(struct net_device *dev, u32 flags){ if (flags & XDP_FLAGS_HW_MODE) return XDP_MODE_HW; if (flags & XDP_FLAGS_DRV_MODE) return XDP_MODE_DRV; if (flags & XDP_FLAGS_SKB_MODE) return XDP_MODE_SKB; return dev->netdev_ops->ndo_bpf ? XDP_MODE_DRV : XDP_MODE_SKB;}
static bpf_op_t dev_xdp_bpf_op(struct net_device *dev, enum bpf_xdp_mode mode){ switch (mode) { case XDP_MODE_SKB: return generic_xdp_install; case XDP_MODE_DRV: case XDP_MODE_HW: return dev->netdev_ops->ndo_bpf; default: return NULL; }}
static struct bpf_xdp_link *dev_xdp_link(struct net_device *dev, enum bpf_xdp_mode mode){ return dev->xdp_state[mode].link;}
static struct bpf_prog *dev_xdp_prog(struct net_device *dev, enum bpf_xdp_mode mode){ struct bpf_xdp_link *link = dev_xdp_link(dev, mode);
if (link) return link->link.prog; return dev->xdp_state[mode].prog;}
u8 dev_xdp_prog_count(struct net_device *dev){ u8 count = 0; int i;
for (i = 0; i < __MAX_XDP_MODE; i++) if (dev->xdp_state[i].prog || dev->xdp_state[i].link) count++; return count;}EXPORT_SYMBOL_GPL(dev_xdp_prog_count);
u8 dev_xdp_sb_prog_count(struct net_device *dev){ struct bpf_prog *prog; u8 count = 0; int i;
for (i = 0; i < __MAX_XDP_MODE; i++) { prog = dev_xdp_prog(dev, i); if (prog && !prog->aux->xdp_has_frags) count++; } return count;}
int netif_xdp_propagate(struct net_device *dev, struct netdev_bpf *bpf){ if (!dev->netdev_ops->ndo_bpf) return -EOPNOTSUPP;
if (dev->cfg->hds_config == ETHTOOL_TCP_DATA_SPLIT_ENABLED && bpf->command == XDP_SETUP_PROG && bpf->prog && !bpf->prog->aux->xdp_has_frags) { NL_SET_ERR_MSG(bpf->extack, "unable to propagate XDP to device using tcp-data-split"); return -EBUSY; }
if (dev_get_min_mp_channel_count(dev)) { NL_SET_ERR_MSG(bpf->extack, "unable to propagate XDP to device using memory provider"); return -EBUSY; }
return dev->netdev_ops->ndo_bpf(dev, bpf);}EXPORT_SYMBOL_GPL(netif_xdp_propagate);
u32 dev_xdp_prog_id(struct net_device *dev, enum bpf_xdp_mode mode){ struct bpf_prog *prog = dev_xdp_prog(dev, mode);
return prog ? prog->aux->id : 0;}
static void dev_xdp_set_link(struct net_device *dev, enum bpf_xdp_mode mode, struct bpf_xdp_link *link){ dev->xdp_state[mode].link = link; dev->xdp_state[mode].prog = NULL;}
static void dev_xdp_set_prog(struct net_device *dev, enum bpf_xdp_mode mode, struct bpf_prog *prog){ dev->xdp_state[mode].link = NULL; dev->xdp_state[mode].prog = prog;}
static int dev_xdp_install(struct net_device *dev, enum bpf_xdp_mode mode, bpf_op_t bpf_op, struct netlink_ext_ack *extack, u32 flags, struct bpf_prog *prog){ struct netdev_bpf xdp; int err;
netdev_assert_locked_ops_compat(dev);
if (prog) { enum bpf_xdp_mode other_mode = mode == XDP_MODE_SKB ? XDP_MODE_DRV : XDP_MODE_SKB; bool offload = mode == XDP_MODE_HW;
if (!offload && dev_xdp_prog(dev, other_mode)) { NL_SET_ERR_MSG(extack, "Native and generic XDP can't be active at the same time"); return -EEXIST; } if (!offload && bpf_prog_is_offloaded(prog->aux)) { NL_SET_ERR_MSG(extack, "Using offloaded program without HW_MODE flag is not supported"); return -EINVAL; } if (bpf_prog_is_dev_bound(prog->aux) && !bpf_offload_dev_match(prog, dev)) { NL_SET_ERR_MSG(extack, "Program bound to different device"); return -EINVAL; } if (bpf_prog_is_dev_bound(prog->aux) && mode == XDP_MODE_SKB) { NL_SET_ERR_MSG(extack, "Can't attach device-bound programs in generic mode"); return -EINVAL; } if (prog->expected_attach_type == BPF_XDP_DEVMAP) { NL_SET_ERR_MSG(extack, "BPF_XDP_DEVMAP programs can not be attached to a device"); return -EINVAL; } if (prog->expected_attach_type == BPF_XDP_CPUMAP) { NL_SET_ERR_MSG(extack, "BPF_XDP_CPUMAP programs can not be attached to a device"); return -EINVAL; } }
if (dev->cfg->hds_config == ETHTOOL_TCP_DATA_SPLIT_ENABLED && prog && !prog->aux->xdp_has_frags) { NL_SET_ERR_MSG(extack, "unable to install XDP to device using tcp-data-split"); return -EBUSY; }
if (dev_get_min_mp_channel_count(dev)) { NL_SET_ERR_MSG(extack, "unable to install XDP to device using memory provider"); return -EBUSY; }
memset(&xdp, 0, sizeof(xdp)); xdp.command = mode == XDP_MODE_HW ? XDP_SETUP_PROG_HW : XDP_SETUP_PROG; xdp.extack = extack; xdp.flags = flags; xdp.prog = prog;
/* Drivers assume refcnt is already incremented (i.e, prog pointer is * "moved" into driver), so they don't increment it on their own, but * they do decrement refcnt when program is detached or replaced. * Given net_device also owns link/prog, we need to bump refcnt here * to prevent drivers from underflowing it. */ if (prog) bpf_prog_inc(prog); err = bpf_op(dev, &xdp); if (err) { if (prog) bpf_prog_put(prog); return err; }
if (mode != XDP_MODE_HW) bpf_prog_change_xdp(dev_xdp_prog(dev, mode), prog);
return 0;}
static void dev_xdp_uninstall(struct net_device *dev){ struct bpf_xdp_link *link; struct bpf_prog *prog; enum bpf_xdp_mode mode; bpf_op_t bpf_op;
ASSERT_RTNL();
for (mode = XDP_MODE_SKB; mode < __MAX_XDP_MODE; mode++) { prog = dev_xdp_prog(dev, mode); if (!prog) continue;
bpf_op = dev_xdp_bpf_op(dev, mode); if (!bpf_op) continue;
WARN_ON(dev_xdp_install(dev, mode, bpf_op, NULL, 0, NULL));
/* auto-detach link from net device */ link = dev_xdp_link(dev, mode); if (link) link->dev = NULL; else bpf_prog_put(prog);
dev_xdp_set_link(dev, mode, NULL); }}
static int dev_xdp_attach(struct net_device *dev, struct netlink_ext_ack *extack, struct bpf_xdp_link *link, struct bpf_prog *new_prog, struct bpf_prog *old_prog, u32 flags){ unsigned int num_modes = hweight32(flags & XDP_FLAGS_MODES); struct bpf_prog *cur_prog; struct net_device *upper; struct list_head *iter; enum bpf_xdp_mode mode; bpf_op_t bpf_op; int err;
ASSERT_RTNL();
/* either link or prog attachment, never both */ if (link && (new_prog || old_prog)) return -EINVAL; /* link supports only XDP mode flags */ if (link && (flags & ~XDP_FLAGS_MODES)) { NL_SET_ERR_MSG(extack, "Invalid XDP flags for BPF link attachment"); return -EINVAL; } /* just one XDP mode bit should be set, zero defaults to drv/skb mode */ if (num_modes > 1) { NL_SET_ERR_MSG(extack, "Only one XDP mode flag can be set"); return -EINVAL; } /* avoid ambiguity if offload + drv/skb mode progs are both loaded */ if (!num_modes && dev_xdp_prog_count(dev) > 1) { NL_SET_ERR_MSG(extack, "More than one program loaded, unset mode is ambiguous"); return -EINVAL; } /* old_prog != NULL implies XDP_FLAGS_REPLACE is set */ if (old_prog && !(flags & XDP_FLAGS_REPLACE)) { NL_SET_ERR_MSG(extack, "XDP_FLAGS_REPLACE is not specified"); return -EINVAL; }
mode = dev_xdp_mode(dev, flags); /* can't replace attached link */ if (dev_xdp_link(dev, mode)) { NL_SET_ERR_MSG(extack, "Can't replace active BPF XDP link"); return -EBUSY; }
/* don't allow if an upper device already has a program */ netdev_for_each_upper_dev_rcu(dev, upper, iter) { if (dev_xdp_prog_count(upper) > 0) { NL_SET_ERR_MSG(extack, "Cannot attach when an upper device already has a program"); return -EEXIST; } }
cur_prog = dev_xdp_prog(dev, mode); /* can't replace attached prog with link */ if (link && cur_prog) { NL_SET_ERR_MSG(extack, "Can't replace active XDP program with BPF link"); return -EBUSY; } if ((flags & XDP_FLAGS_REPLACE) && cur_prog != old_prog) { NL_SET_ERR_MSG(extack, "Active program does not match expected"); return -EEXIST; }
/* put effective new program into new_prog */ if (link) new_prog = link->link.prog;
if (new_prog) { if ((flags & XDP_FLAGS_UPDATE_IF_NOEXIST) && cur_prog) { NL_SET_ERR_MSG(extack, "XDP program already attached"); return -EBUSY; } }
/* don't call drivers if the effective program didn't change */ if (new_prog != cur_prog) { bpf_op = dev_xdp_bpf_op(dev, mode); if (!bpf_op) { NL_SET_ERR_MSG(extack, "Underlying driver does not support XDP in native mode"); return -EOPNOTSUPP; }
err = dev_xdp_install(dev, mode, bpf_op, extack, flags, new_prog); if (err) return err; }
if (link) dev_xdp_set_link(dev, mode, link); else dev_xdp_set_prog(dev, mode, new_prog); if (cur_prog) bpf_prog_put(cur_prog);
return 0;}
static int dev_xdp_attach_link(struct net_device *dev, struct netlink_ext_ack *extack, struct bpf_xdp_link *link){ return dev_xdp_attach(dev, extack, link, NULL, NULL, link->flags);}
static int dev_xdp_detach_link(struct net_device *dev, struct netlink_ext_ack *extack, struct bpf_xdp_link *link){ enum bpf_xdp_mode mode; bpf_op_t bpf_op;
ASSERT_RTNL();
mode = dev_xdp_mode(dev, link->flags); if (dev_xdp_link(dev, mode) != link) return -EINVAL;
bpf_op = dev_xdp_bpf_op(dev, mode); WARN_ON(dev_xdp_install(dev, mode, bpf_op, NULL, 0, NULL)); dev_xdp_set_link(dev, mode, NULL); return 0;}
static void bpf_xdp_link_release(struct bpf_link *link){ struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link);
rtnl_lock();
/* if racing with net_device's tear down, xdp_link->dev might be * already NULL, in which case link was already auto-detached */ if (xdp_link->dev) { netdev_lock_ops(xdp_link->dev); WARN_ON(dev_xdp_detach_link(xdp_link->dev, NULL, xdp_link)); netdev_unlock_ops(xdp_link->dev); xdp_link->dev = NULL; }
rtnl_unlock();}
static int bpf_xdp_link_detach(struct bpf_link *link){ bpf_xdp_link_release(link); return 0;}
static void bpf_xdp_link_dealloc(struct bpf_link *link){ struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link);
kfree(xdp_link);}
static void bpf_xdp_link_show_fdinfo(const struct bpf_link *link, struct seq_file *seq){ struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); u32 ifindex = 0;
rtnl_lock(); if (xdp_link->dev) ifindex = xdp_link->dev->ifindex; rtnl_unlock();
seq_printf(seq, "ifindex:\t%u\n", ifindex);}
static int bpf_xdp_link_fill_link_info(const struct bpf_link *link, struct bpf_link_info *info){ struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); u32 ifindex = 0;
rtnl_lock(); if (xdp_link->dev) ifindex = xdp_link->dev->ifindex; rtnl_unlock();
info->xdp.ifindex = ifindex; return 0;}
static int bpf_xdp_link_update(struct bpf_link *link, struct bpf_prog *new_prog, struct bpf_prog *old_prog){ struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); enum bpf_xdp_mode mode; bpf_op_t bpf_op; int err = 0;
rtnl_lock();
/* link might have been auto-released already, so fail */ if (!xdp_link->dev) { err = -ENOLINK; goto out_unlock; }
if (old_prog && link->prog != old_prog) { err = -EPERM; goto out_unlock; } old_prog = link->prog; if (old_prog->type != new_prog->type || old_prog->expected_attach_type != new_prog->expected_attach_type) { err = -EINVAL; goto out_unlock; }
if (old_prog == new_prog) { /* no-op, don't disturb drivers */ bpf_prog_put(new_prog); goto out_unlock; }
netdev_lock_ops(xdp_link->dev); mode = dev_xdp_mode(xdp_link->dev, xdp_link->flags); bpf_op = dev_xdp_bpf_op(xdp_link->dev, mode); err = dev_xdp_install(xdp_link->dev, mode, bpf_op, NULL, xdp_link->flags, new_prog); if (!err) old_prog = xchg(&link->prog, new_prog); netdev_unlock_ops(xdp_link->dev); if (err) goto out_unlock;
bpf_prog_put(old_prog);
out_unlock: rtnl_unlock(); return err;}
static const struct bpf_link_ops bpf_xdp_link_lops = { .release = bpf_xdp_link_release, .dealloc = bpf_xdp_link_dealloc, .detach = bpf_xdp_link_detach, .show_fdinfo = bpf_xdp_link_show_fdinfo, .fill_link_info = bpf_xdp_link_fill_link_info, .update_prog = bpf_xdp_link_update,};
int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog){ struct net *net = current->nsproxy->net_ns; struct bpf_link_primer link_primer; struct netlink_ext_ack extack = {}; struct bpf_xdp_link *link; struct net_device *dev; int err, fd;
rtnl_lock(); dev = dev_get_by_index(net, attr->link_create.target_ifindex); if (!dev) { rtnl_unlock(); return -EINVAL; }
link = kzalloc_obj(*link, GFP_USER); if (!link) { err = -ENOMEM; goto unlock; }
bpf_link_init(&link->link, BPF_LINK_TYPE_XDP, &bpf_xdp_link_lops, prog, attr->link_create.attach_type); link->dev = dev; link->flags = attr->link_create.flags;
err = bpf_link_prime(&link->link, &link_primer); if (err) { kfree(link); goto unlock; }
netdev_lock_ops(dev); err = dev_xdp_attach_link(dev, &extack, link); netdev_unlock_ops(dev); rtnl_unlock();
if (err) { link->dev = NULL; bpf_link_cleanup(&link_primer); trace_bpf_xdp_link_attach_failed(extack._msg); goto out_put_dev; }
fd = bpf_link_settle(&link_primer); /* link itself doesn't hold dev's refcnt to not complicate shutdown */ dev_put(dev); return fd;
unlock: rtnl_unlock();
out_put_dev: dev_put(dev); return err;}
/** * dev_change_xdp_fd - set or clear a bpf program for a device rx path * @dev: device * @extack: netlink extended ack * @fd: new program fd or negative value to clear * @expected_fd: old program fd that userspace expects to replace or clear * @flags: xdp-related flags * * Set or clear a bpf program for a device */int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack, int fd, int expected_fd, u32 flags){ enum bpf_xdp_mode mode = dev_xdp_mode(dev, flags); struct bpf_prog *new_prog = NULL, *old_prog = NULL; int err;
ASSERT_RTNL();
if (fd >= 0) { new_prog = bpf_prog_get_type_dev(fd, BPF_PROG_TYPE_XDP, mode != XDP_MODE_SKB); if (IS_ERR(new_prog)) return PTR_ERR(new_prog); }
if (expected_fd >= 0) { old_prog = bpf_prog_get_type_dev(expected_fd, BPF_PROG_TYPE_XDP, mode != XDP_MODE_SKB); if (IS_ERR(old_prog)) { err = PTR_ERR(old_prog); old_prog = NULL; goto err_out; } }
err = dev_xdp_attach(dev, extack, NULL, new_prog, old_prog, flags);
err_out: if (err && new_prog) bpf_prog_put(new_prog); if (old_prog) bpf_prog_put(old_prog); return err;}
u32 dev_get_min_mp_channel_count(const struct net_device *dev){ int i;
netdev_assert_locked_ops_compat(dev);
for (i = dev->real_num_rx_queues - 1; i >= 0; i--) if (dev->_rx[i].mp_params.mp_priv) /* The channel count is the idx plus 1. */ return i + 1;
return 0;}
/** * dev_index_reserve() - allocate an ifindex in a namespace * @net: the applicable net namespace * @ifindex: requested ifindex, pass %0 to get one allocated * * Allocate a ifindex for a new device. Caller must either use the ifindex * to store the device (via list_netdevice()) or call dev_index_release() * to give the index up. * * Return: a suitable unique value for a new device interface number or -errno. */static int dev_index_reserve(struct net *net, u32 ifindex){ int err;
if (ifindex > INT_MAX) { DEBUG_NET_WARN_ON_ONCE(1); return -EINVAL; }
if (!ifindex) err = xa_alloc_cyclic(&net->dev_by_index, &ifindex, NULL, xa_limit_31b, &net->ifindex, GFP_KERNEL); else err = xa_insert(&net->dev_by_index, ifindex, NULL, GFP_KERNEL); if (err < 0) return err;
return ifindex;}
static void dev_index_release(struct net *net, int ifindex){ /* Expect only unused indexes, unlist_netdevice() removes the used */ WARN_ON(xa_erase(&net->dev_by_index, ifindex));}
static bool from_cleanup_net(void){#ifdef CONFIG_NET_NS return current == READ_ONCE(cleanup_net_task);#else return false;#endif}
/* Delayed registration/unregisteration */LIST_HEAD(net_todo_list);DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq);atomic_t dev_unreg_count = ATOMIC_INIT(0);
static void net_set_todo(struct net_device *dev){ list_add_tail(&dev->todo_list, &net_todo_list);}
static netdev_features_t netdev_sync_upper_features(struct net_device *lower, struct net_device *upper, netdev_features_t features){ netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES; netdev_features_t feature; int feature_bit;
for_each_netdev_feature(upper_disables, feature_bit) { feature = __NETIF_F_BIT(feature_bit); if (!(upper->wanted_features & feature) && (features & feature)) { netdev_dbg(lower, "Dropping feature %pNF, upper dev %s has it off.\n", &feature, upper->name); features &= ~feature; } }
return features;}
static void netdev_sync_lower_features(struct net_device *upper, struct net_device *lower, netdev_features_t features){ netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES; netdev_features_t feature; int feature_bit;
for_each_netdev_feature(upper_disables, feature_bit) { feature = __NETIF_F_BIT(feature_bit); if (!(features & feature) && (lower->features & feature)) { netdev_dbg(upper, "Disabling feature %pNF on lower dev %s.\n", &feature, lower->name); netdev_lock_ops(lower); lower->wanted_features &= ~feature; __netdev_update_features(lower);
if (unlikely(lower->features & feature)) netdev_WARN(upper, "failed to disable %pNF on %s!\n", &feature, lower->name); else netdev_features_change(lower); netdev_unlock_ops(lower); } }}
static bool netdev_has_ip_or_hw_csum(netdev_features_t features){ netdev_features_t ip_csum_mask = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; bool ip_csum = (features & ip_csum_mask) == ip_csum_mask; bool hw_csum = features & NETIF_F_HW_CSUM;
return ip_csum || hw_csum;}
static netdev_features_t netdev_fix_features(struct net_device *dev, netdev_features_t features){ /* Fix illegal checksum combinations */ if ((features & NETIF_F_HW_CSUM) && (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { netdev_warn(dev, "mixed HW and IP checksum settings.\n"); features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); }
/* TSO requires that SG is present as well. */ if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) { netdev_dbg(dev, "Dropping TSO features since no SG feature.\n"); features &= ~NETIF_F_ALL_TSO; }
if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) && !(features & NETIF_F_IP_CSUM)) { netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n"); features &= ~NETIF_F_TSO; features &= ~NETIF_F_TSO_ECN; }
if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) && !(features & NETIF_F_IPV6_CSUM)) { netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n"); features &= ~NETIF_F_TSO6; }
/* TSO with IPv4 ID mangling requires IPv4 TSO be enabled */ if ((features & NETIF_F_TSO_MANGLEID) && !(features & NETIF_F_TSO)) features &= ~NETIF_F_TSO_MANGLEID;
/* TSO ECN requires that TSO is present as well. */ if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN) features &= ~NETIF_F_TSO_ECN;
/* Software GSO depends on SG. */ if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) { netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n"); features &= ~NETIF_F_GSO; }
/* GSO partial features require GSO partial be set */ if ((features & dev->gso_partial_features) && !(features & NETIF_F_GSO_PARTIAL)) { netdev_dbg(dev, "Dropping partially supported GSO features since no GSO partial.\n"); features &= ~dev->gso_partial_features; }
if (!(features & NETIF_F_RXCSUM)) { /* NETIF_F_GRO_HW implies doing RXCSUM since every packet * successfully merged by hardware must also have the * checksum verified by hardware. If the user does not * want to enable RXCSUM, logically, we should disable GRO_HW. */ if (features & NETIF_F_GRO_HW) { netdev_dbg(dev, "Dropping NETIF_F_GRO_HW since no RXCSUM feature.\n"); features &= ~NETIF_F_GRO_HW; } }
/* LRO/HW-GRO features cannot be combined with RX-FCS */ if (features & NETIF_F_RXFCS) { if (features & NETIF_F_LRO) { netdev_dbg(dev, "Dropping LRO feature since RX-FCS is requested.\n"); features &= ~NETIF_F_LRO; }
if (features & NETIF_F_GRO_HW) { netdev_dbg(dev, "Dropping HW-GRO feature since RX-FCS is requested.\n"); features &= ~NETIF_F_GRO_HW; } }
if ((features & NETIF_F_GRO_HW) && (features & NETIF_F_LRO)) { netdev_dbg(dev, "Dropping LRO feature since HW-GRO is requested.\n"); features &= ~NETIF_F_LRO; }
if ((features & NETIF_F_HW_TLS_TX) && !netdev_has_ip_or_hw_csum(features)) { netdev_dbg(dev, "Dropping TLS TX HW offload feature since no CSUM feature.\n"); features &= ~NETIF_F_HW_TLS_TX; }
if ((features & NETIF_F_HW_TLS_RX) && !(features & NETIF_F_RXCSUM)) { netdev_dbg(dev, "Dropping TLS RX HW offload feature since no RXCSUM feature.\n"); features &= ~NETIF_F_HW_TLS_RX; }
if ((features & NETIF_F_GSO_UDP_L4) && !netdev_has_ip_or_hw_csum(features)) { netdev_dbg(dev, "Dropping USO feature since no CSUM feature.\n"); features &= ~NETIF_F_GSO_UDP_L4; }
return features;}
int __netdev_update_features(struct net_device *dev){ struct net_device *upper, *lower; netdev_features_t features; struct list_head *iter; int err = -1;
ASSERT_RTNL(); netdev_assert_locked_ops_compat(dev);
features = netdev_get_wanted_features(dev);
if (dev->netdev_ops->ndo_fix_features) features = dev->netdev_ops->ndo_fix_features(dev, features);
/* driver might be less strict about feature dependencies */ features = netdev_fix_features(dev, features);
/* some features can't be enabled if they're off on an upper device */ netdev_for_each_upper_dev_rcu(dev, upper, iter) features = netdev_sync_upper_features(dev, upper, features);
if (dev->features == features) goto sync_lower;
netdev_dbg(dev, "Features changed: %pNF -> %pNF\n", &dev->features, &features);
if (dev->netdev_ops->ndo_set_features) err = dev->netdev_ops->ndo_set_features(dev, features); else err = 0;
if (unlikely(err < 0)) { netdev_err(dev, "set_features() failed (%d); wanted %pNF, left %pNF\n", err, &features, &dev->features); /* return non-0 since some features might have changed and * it's better to fire a spurious notification than miss it */ return -1; }
sync_lower: /* some features must be disabled on lower devices when disabled * on an upper device (think: bonding master or bridge) */ netdev_for_each_lower_dev(dev, lower, iter) netdev_sync_lower_features(dev, lower, features);
if (!err) { netdev_features_t diff = features ^ dev->features;
if (diff & NETIF_F_RX_UDP_TUNNEL_PORT) { /* udp_tunnel_{get,drop}_rx_info both need * NETIF_F_RX_UDP_TUNNEL_PORT enabled on the * device, or they won't do anything. * Thus we need to update dev->features * *before* calling udp_tunnel_get_rx_info, * but *after* calling udp_tunnel_drop_rx_info. */ udp_tunnel_nic_lock(dev); if (features & NETIF_F_RX_UDP_TUNNEL_PORT) { dev->features = features; udp_tunnel_get_rx_info(dev); } else { udp_tunnel_drop_rx_info(dev); } udp_tunnel_nic_unlock(dev); }
if (diff & NETIF_F_HW_VLAN_CTAG_FILTER) { if (features & NETIF_F_HW_VLAN_CTAG_FILTER) { dev->features = features; err |= vlan_get_rx_ctag_filter_info(dev); } else { vlan_drop_rx_ctag_filter_info(dev); } }
if (diff & NETIF_F_HW_VLAN_STAG_FILTER) { if (features & NETIF_F_HW_VLAN_STAG_FILTER) { dev->features = features; err |= vlan_get_rx_stag_filter_info(dev); } else { vlan_drop_rx_stag_filter_info(dev); } }
dev->features = features; }
return err < 0 ? 0 : 1;}
/** * netdev_update_features - recalculate device features * @dev: the device to check * * Recalculate dev->features set and send notifications if it * has changed. Should be called after driver or hardware dependent * conditions might have changed that influence the features. */void netdev_update_features(struct net_device *dev){ if (__netdev_update_features(dev)) netdev_features_change(dev);}EXPORT_SYMBOL(netdev_update_features);
/** * netdev_change_features - recalculate device features * @dev: the device to check * * Recalculate dev->features set and send notifications even * if they have not changed. Should be called instead of * netdev_update_features() if also dev->vlan_features might * have changed to allow the changes to be propagated to stacked * VLAN devices. */void netdev_change_features(struct net_device *dev){ __netdev_update_features(dev); netdev_features_change(dev);}EXPORT_SYMBOL(netdev_change_features);
/** * netif_stacked_transfer_operstate - transfer operstate * @rootdev: the root or lower level device to transfer state from * @dev: the device to transfer operstate to * * Transfer operational state from root to device. This is normally * called when a stacking relationship exists between the root * device and the device(a leaf device). */void netif_stacked_transfer_operstate(const struct net_device *rootdev, struct net_device *dev){ if (rootdev->operstate == IF_OPER_DORMANT) netif_dormant_on(dev); else netif_dormant_off(dev);
if (rootdev->operstate == IF_OPER_TESTING) netif_testing_on(dev); else netif_testing_off(dev);
if (netif_carrier_ok(rootdev)) netif_carrier_on(dev); else netif_carrier_off(dev);}EXPORT_SYMBOL(netif_stacked_transfer_operstate);
static int netif_alloc_rx_queues(struct net_device *dev){ unsigned int i, count = dev->num_rx_queues; struct netdev_rx_queue *rx; size_t sz = count * sizeof(*rx); int err = 0;
BUG_ON(count < 1);
rx = kvzalloc(sz, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL); if (!rx) return -ENOMEM;
dev->_rx = rx;
for (i = 0; i < count; i++) { rx[i].dev = dev;
/* XDP RX-queue setup */ err = xdp_rxq_info_reg(&rx[i].xdp_rxq, dev, i, 0); if (err < 0) goto err_rxq_info; } return 0;
err_rxq_info: /* Rollback successful reg's and free other resources */ while (i--) xdp_rxq_info_unreg(&rx[i].xdp_rxq); kvfree(dev->_rx); dev->_rx = NULL; return err;}
static void netif_free_rx_queues(struct net_device *dev){ unsigned int i, count = dev->num_rx_queues;
/* netif_alloc_rx_queues alloc failed, resources have been unreg'ed */ if (!dev->_rx) return;
for (i = 0; i < count; i++) xdp_rxq_info_unreg(&dev->_rx[i].xdp_rxq);
kvfree(dev->_rx);}
static void netdev_init_one_queue(struct net_device *dev, struct netdev_queue *queue, void *_unused){ /* Initialize queue lock */ spin_lock_init(&queue->_xmit_lock); netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type); queue->xmit_lock_owner = -1; netdev_queue_numa_node_write(queue, NUMA_NO_NODE); queue->dev = dev;#ifdef CONFIG_BQL dql_init(&queue->dql, HZ);#endif}
static void netif_free_tx_queues(struct net_device *dev){ kvfree(dev->_tx);}
static int netif_alloc_netdev_queues(struct net_device *dev){ unsigned int count = dev->num_tx_queues; struct netdev_queue *tx; size_t sz = count * sizeof(*tx);
if (count < 1 || count > 0xffff) return -EINVAL;
tx = kvzalloc(sz, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL); if (!tx) return -ENOMEM;
dev->_tx = tx;
netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); spin_lock_init(&dev->tx_global_lock); spin_lock_init(&dev->watchdog_lock); dev->watchdog_ref_held = false; return 0;}
void netif_tx_stop_all_queues(struct net_device *dev){ unsigned int i;
for (i = 0; i < dev->num_tx_queues; i++) { struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
netif_tx_stop_queue(txq); }}EXPORT_SYMBOL(netif_tx_stop_all_queues);
static int netdev_do_alloc_pcpu_stats(struct net_device *dev){ void __percpu *v;
/* Drivers implementing ndo_get_peer_dev must support tstat * accounting, so that skb_do_redirect() can bump the dev's * RX stats upon network namespace switch. */ if (dev->netdev_ops->ndo_get_peer_dev && dev->pcpu_stat_type != NETDEV_PCPU_STAT_TSTATS) return -EOPNOTSUPP;
switch (dev->pcpu_stat_type) { case NETDEV_PCPU_STAT_NONE: return 0; case NETDEV_PCPU_STAT_LSTATS: v = dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats); break; case NETDEV_PCPU_STAT_TSTATS: v = dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); break; case NETDEV_PCPU_STAT_DSTATS: v = dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); break; default: return -EINVAL; }
return v ? 0 : -ENOMEM;}
static void netdev_do_free_pcpu_stats(struct net_device *dev){ switch (dev->pcpu_stat_type) { case NETDEV_PCPU_STAT_NONE: return; case NETDEV_PCPU_STAT_LSTATS: free_percpu(dev->lstats); break; case NETDEV_PCPU_STAT_TSTATS: free_percpu(dev->tstats); break; case NETDEV_PCPU_STAT_DSTATS: free_percpu(dev->dstats); break; }}
static void netdev_free_phy_link_topology(struct net_device *dev){ struct phy_link_topology *topo = dev->link_topo;
if (IS_ENABLED(CONFIG_PHYLIB) && topo) { xa_destroy(&topo->phys); kfree(topo); dev->link_topo = NULL; }}
/** * register_netdevice() - register a network device * @dev: device to register * * Take a prepared network device structure and make it externally accessible. * A %NETDEV_REGISTER message is sent to the netdev notifier chain. * Callers must hold the rtnl lock - you may want register_netdev() * instead of this. */int register_netdevice(struct net_device *dev){ int ret; struct net *net = dev_net(dev);
BUILD_BUG_ON(sizeof(netdev_features_t) * BITS_PER_BYTE < NETDEV_FEATURE_COUNT); BUG_ON(dev_boot_phase); ASSERT_RTNL();
might_sleep();
/* When net_device's are persistent, this will be fatal. */ BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); BUG_ON(!net);
ret = ethtool_check_ops(dev->ethtool_ops); if (ret) return ret;
/* rss ctx ID 0 is reserved for the default context, start from 1 */ xa_init_flags(&dev->ethtool->rss_ctx, XA_FLAGS_ALLOC1); mutex_init(&dev->ethtool->rss_lock);
spin_lock_init(&dev->addr_list_lock); netdev_set_addr_lockdep_class(dev);
ret = dev_get_valid_name(net, dev, dev->name); if (ret < 0) goto out;
ret = -ENOMEM; dev->name_node = netdev_name_node_head_alloc(dev); if (!dev->name_node) goto out;
/* Init, if this function is available */ if (dev->netdev_ops->ndo_init) { ret = dev->netdev_ops->ndo_init(dev); if (ret) { if (ret > 0) ret = -EIO; goto err_free_name; } }
if (((dev->hw_features | dev->features) & NETIF_F_HW_VLAN_CTAG_FILTER) && (!dev->netdev_ops->ndo_vlan_rx_add_vid || !dev->netdev_ops->ndo_vlan_rx_kill_vid)) { netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n"); ret = -EINVAL; goto err_uninit; }
if (netdev_need_ops_lock(dev) && dev->netdev_ops->ndo_set_rx_mode && !dev->netdev_ops->ndo_set_rx_mode_async) netdev_WARN(dev, "ops-locked drivers should use ndo_set_rx_mode_async\n");
ret = netdev_do_alloc_pcpu_stats(dev); if (ret) goto err_uninit;
ret = dev_index_reserve(net, dev->ifindex); if (ret < 0) goto err_free_pcpu; dev->ifindex = ret;
/* Transfer changeable features to wanted_features and enable * software offloads (GSO and GRO). */ dev->hw_features |= (NETIF_F_SOFT_FEATURES | NETIF_F_SOFT_FEATURES_OFF); dev->features |= NETIF_F_SOFT_FEATURES;
if (dev->udp_tunnel_nic_info) { dev->features |= NETIF_F_RX_UDP_TUNNEL_PORT; dev->hw_features |= NETIF_F_RX_UDP_TUNNEL_PORT; }
dev->wanted_features = dev->features & dev->hw_features;
if (!(dev->flags & IFF_LOOPBACK)) dev->hw_features |= NETIF_F_NOCACHE_COPY;
/* If IPv4 TCP segmentation offload is supported we should also * allow the device to enable segmenting the frame with the option * of ignoring a static IP ID value. This doesn't enable the * feature itself but allows the user to enable it later. */ if (dev->hw_features & NETIF_F_TSO) dev->hw_features |= NETIF_F_TSO_MANGLEID; if (dev->vlan_features & NETIF_F_TSO) dev->vlan_features |= NETIF_F_TSO_MANGLEID; if (dev->mpls_features & NETIF_F_TSO) dev->mpls_features |= NETIF_F_TSO_MANGLEID; if (dev->hw_enc_features & NETIF_F_TSO) dev->hw_enc_features |= NETIF_F_TSO_MANGLEID;
/* TSO_MANGLEID belongs in mangleid_features by definition */ dev->mangleid_features |= NETIF_F_TSO_MANGLEID;
/* Make NETIF_F_HIGHDMA inheritable to VLAN devices. */ dev->vlan_features |= NETIF_F_HIGHDMA;
/* Make NETIF_F_SG inheritable to tunnel devices. */ dev->hw_enc_features |= NETIF_F_SG | NETIF_F_GSO_PARTIAL;
/* Make NETIF_F_SG inheritable to MPLS. */ dev->mpls_features |= NETIF_F_SG;
ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); ret = notifier_to_errno(ret); if (ret) goto err_ifindex_release;
ret = netdev_register_kobject(dev);
netdev_lock(dev); WRITE_ONCE(dev->reg_state, ret ? NETREG_UNREGISTERED : NETREG_REGISTERED); netdev_unlock(dev);
if (ret) goto err_uninit_notify;
netdev_lock_ops(dev); __netdev_update_features(dev); netdev_unlock_ops(dev);
/* * Default initial state at registry is that the * device is present. */
set_bit(__LINK_STATE_PRESENT, &dev->state);
linkwatch_init_dev(dev);
dev_init_scheduler(dev);
netdev_hold(dev, &dev->dev_registered_tracker, GFP_KERNEL); list_netdevice(dev);
add_device_randomness(dev->dev_addr, dev->addr_len);
/* If the device has permanent device address, driver should * set dev_addr and also addr_assign_type should be set to * NET_ADDR_PERM (default value). */ if (dev->addr_assign_type == NET_ADDR_PERM) memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
/* Notify protocols, that a new device appeared. */ netdev_lock_ops(dev); ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); netdev_unlock_ops(dev); ret = notifier_to_errno(ret); if (ret) { /* Expect explicit free_netdev() on failure */ dev->needs_free_netdev = false; unregister_netdevice_queue(dev, NULL); goto out; } /* * Prevent userspace races by waiting until the network * device is fully setup before sending notifications. */ netdev_uevent_add(dev); if (!(dev->rtnl_link_ops && dev->rtnl_link_initializing)) rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL, 0, NULL);
out: return ret;
err_uninit_notify: call_netdevice_notifiers(NETDEV_PRE_UNINIT, dev);err_ifindex_release: dev_index_release(net, dev->ifindex);err_free_pcpu: netdev_do_free_pcpu_stats(dev);err_uninit: if (dev->netdev_ops->ndo_uninit) dev->netdev_ops->ndo_uninit(dev); if (dev->priv_destructor) dev->priv_destructor(dev);err_free_name: netdev_name_node_free(dev->name_node); goto out;}EXPORT_SYMBOL(register_netdevice);
/* Initialize the core of a dummy net device. * The setup steps dummy netdevs need which normal netdevs get by going * through register_netdevice(). */static void init_dummy_netdev(struct net_device *dev){ /* make sure we BUG if trying to hit standard * register/unregister code path */ dev->reg_state = NETREG_DUMMY;
/* a dummy interface is started by default */ set_bit(__LINK_STATE_PRESENT, &dev->state); set_bit(__LINK_STATE_START, &dev->state);
/* Note : We dont allocate pcpu_refcnt for dummy devices, * because users of this 'device' dont need to change * its refcount. */}
/** * register_netdev - register a network device * @dev: device to register * * Take a completed network device structure and add it to the kernel * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier * chain. 0 is returned on success. A negative errno code is returned * on a failure to set up the device, or if the name is a duplicate. * * This is a wrapper around register_netdevice that takes the rtnl semaphore * and expands the device name if you passed a format string to * alloc_netdev. */int register_netdev(struct net_device *dev){ struct net *net = dev_net(dev); int err;
if (rtnl_net_lock_killable(net)) return -EINTR;
err = register_netdevice(dev);
rtnl_net_unlock(net);
return err;}EXPORT_SYMBOL(register_netdev);
int netdev_refcnt_read(const struct net_device *dev){#ifdef CONFIG_PCPU_DEV_REFCNT int i, refcnt = 0;
for_each_possible_cpu(i) refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i); return refcnt;#else return refcount_read(&dev->dev_refcnt);#endif}EXPORT_SYMBOL(netdev_refcnt_read);
int netdev_unregister_timeout_secs __read_mostly = 10;
#define WAIT_REFS_MIN_MSECS 1#define WAIT_REFS_MAX_MSECS 250/** * netdev_wait_allrefs_any - wait until all references are gone. * @list: list of net_devices to wait on * * This is called when unregistering network devices. * * Any protocol or device that holds a reference should register * for netdevice notification, and cleanup and put back the * reference if they receive an UNREGISTER event. * We can get stuck here if buggy protocols don't correctly * call dev_put. */static struct net_device *netdev_wait_allrefs_any(struct list_head *list){ unsigned long rebroadcast_time, warning_time; struct net_device *dev; int wait = 0;
rebroadcast_time = warning_time = jiffies;
list_for_each_entry(dev, list, todo_list) if (netdev_refcnt_read(dev) == 1) return dev;
while (true) { if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { rtnl_lock();
/* Rebroadcast unregister notification */ list_for_each_entry(dev, list, todo_list) { struct net *net = dev_net(dev);
__rtnl_net_lock(net); call_netdevice_notifiers(NETDEV_UNREGISTER, dev); __rtnl_net_unlock(net); }
__rtnl_unlock(); rcu_barrier(); rtnl_lock();
list_for_each_entry(dev, list, todo_list) if (test_bit(__LINK_STATE_LINKWATCH_PENDING, &dev->state)) { /* We must not have linkwatch events * pending on unregister. If this * happens, we simply run the queue * unscheduled, resulting in a noop * for this device. */ linkwatch_run_queue(); break; }
__rtnl_unlock();
rebroadcast_time = jiffies; }
rcu_barrier();
if (!wait) { wait = WAIT_REFS_MIN_MSECS; } else { msleep(wait); wait = min(wait << 1, WAIT_REFS_MAX_MSECS); }
list_for_each_entry(dev, list, todo_list) if (netdev_refcnt_read(dev) == 1) return dev;
if (time_after(jiffies, warning_time + READ_ONCE(netdev_unregister_timeout_secs) * HZ)) { list_for_each_entry(dev, list, todo_list) { pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n", dev->name, netdev_refcnt_read(dev)); ref_tracker_dir_print(&dev->refcnt_tracker, 10); }
warning_time = jiffies; } }}
/* The sequence is: * * rtnl_lock(); * ... * register_netdevice(x1); * register_netdevice(x2); * ... * unregister_netdevice(y1); * unregister_netdevice(y2); * ... * rtnl_unlock(); * free_netdev(y1); * free_netdev(y2); * * We are invoked by rtnl_unlock(). * This allows us to deal with problems: * 1) We can delete sysfs objects which invoke hotplug * without deadlocking with linkwatch via keventd. * 2) Since we run with the RTNL semaphore not held, we can sleep * safely in order to wait for the netdev refcnt to drop to zero. * * We must not return until all unregister events added during * the interval the lock was held have been completed. */void netdev_run_todo(void){ struct net_device *dev, *tmp; struct list_head list; int cnt;#ifdef CONFIG_LOCKDEP struct list_head unlink_list;
list_replace_init(&net_unlink_list, &unlink_list);
while (!list_empty(&unlink_list)) { dev = list_first_entry(&unlink_list, struct net_device, unlink_list); list_del_init(&dev->unlink_list); dev->nested_level = dev->lower_level - 1; }#endif
/* Snapshot list, allow later requests */ list_replace_init(&net_todo_list, &list);
__rtnl_unlock();
/* Wait for rcu callbacks to finish before next phase */ if (!list_empty(&list)) rcu_barrier();
list_for_each_entry_safe(dev, tmp, &list, todo_list) { if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { netdev_WARN(dev, "run_todo but not unregistering\n"); list_del(&dev->todo_list); continue; }
netdev_lock(dev); WRITE_ONCE(dev->reg_state, NETREG_UNREGISTERED); netdev_unlock(dev); linkwatch_sync_dev(dev); }
cnt = 0; while (!list_empty(&list)) { dev = netdev_wait_allrefs_any(&list); list_del(&dev->todo_list);
/* paranoia */ BUG_ON(netdev_refcnt_read(dev) != 1); BUG_ON(!list_empty(&dev->ptype_all)); BUG_ON(!list_empty(&dev->ptype_specific)); WARN_ON(rcu_access_pointer(dev->ip_ptr)); WARN_ON(rcu_access_pointer(dev->ip6_ptr));
netdev_name_node_alt_flush(dev); netdev_name_node_free(dev->name_node); netdev_do_free_pcpu_stats(dev); if (dev->priv_destructor) dev->priv_destructor(dev); if (dev->needs_free_netdev) free_netdev(dev);
cnt++;
/* Free network device */ kobject_put(&dev->dev.kobj); } if (cnt && atomic_sub_and_test(cnt, &dev_unreg_count)) wake_up(&netdev_unregistering_wq);}
/* Collate per-cpu network dstats statistics * * Read per-cpu network statistics from dev->dstats and populate the related * fields in @s. */static void dev_fetch_dstats(struct rtnl_link_stats64 *s, const struct pcpu_dstats __percpu *dstats){ int cpu;
for_each_possible_cpu(cpu) { u64 rx_packets, rx_bytes, rx_drops; u64 tx_packets, tx_bytes, tx_drops; const struct pcpu_dstats *stats; unsigned int start;
stats = per_cpu_ptr(dstats, cpu); do { start = u64_stats_fetch_begin(&stats->syncp); rx_packets = u64_stats_read(&stats->rx_packets); rx_bytes = u64_stats_read(&stats->rx_bytes); rx_drops = u64_stats_read(&stats->rx_drops); tx_packets = u64_stats_read(&stats->tx_packets); tx_bytes = u64_stats_read(&stats->tx_bytes); tx_drops = u64_stats_read(&stats->tx_drops); } while (u64_stats_fetch_retry(&stats->syncp, start));
s->rx_packets += rx_packets; s->rx_bytes += rx_bytes; s->rx_dropped += rx_drops; s->tx_packets += tx_packets; s->tx_bytes += tx_bytes; s->tx_dropped += tx_drops; }}
/* ndo_get_stats64 implementation for dtstats-based accounting. * * Populate @s from dev->stats and dev->dstats. This is used internally by the * core for NETDEV_PCPU_STAT_DSTAT-type stats collection. */static void dev_get_dstats64(const struct net_device *dev, struct rtnl_link_stats64 *s){ netdev_stats_to_stats64(s, &dev->stats); dev_fetch_dstats(s, dev->dstats);}
/* Convert net_device_stats to rtnl_link_stats64. rtnl_link_stats64 has * all the same fields in the same order as net_device_stats, with only * the type differing, but rtnl_link_stats64 may have additional fields * at the end for newer counters. */void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, const struct net_device_stats *netdev_stats){ size_t i, n = sizeof(*netdev_stats) / sizeof(atomic_long_t); const atomic_long_t *src = (atomic_long_t *)netdev_stats; u64 *dst = (u64 *)stats64;
BUILD_BUG_ON(n > sizeof(*stats64) / sizeof(u64)); for (i = 0; i < n; i++) dst[i] = (unsigned long)atomic_long_read(&src[i]); /* zero out counters that only exist in rtnl_link_stats64 */ memset((char *)stats64 + n * sizeof(u64), 0, sizeof(*stats64) - n * sizeof(u64));}EXPORT_SYMBOL(netdev_stats_to_stats64);
static __cold struct net_device_core_stats __percpu *netdev_core_stats_alloc( struct net_device *dev){ struct net_device_core_stats __percpu *p;
p = alloc_percpu_gfp(struct net_device_core_stats, GFP_ATOMIC | __GFP_NOWARN);
if (p && cmpxchg(&dev->core_stats, NULL, p)) free_percpu(p);
/* This READ_ONCE() pairs with the cmpxchg() above */ return READ_ONCE(dev->core_stats);}
noinline void netdev_core_stats_inc(struct net_device *dev, u32 offset){ /* This READ_ONCE() pairs with the write in netdev_core_stats_alloc() */ struct net_device_core_stats __percpu *p = READ_ONCE(dev->core_stats); unsigned long __percpu *field;
if (unlikely(!p)) { p = netdev_core_stats_alloc(dev); if (!p) return; }
field = (unsigned long __percpu *)((void __percpu *)p + offset); this_cpu_inc(*field);}EXPORT_SYMBOL_GPL(netdev_core_stats_inc);
/** * dev_get_stats - get network device statistics * @dev: device to get statistics from * @storage: place to store stats * * Get network statistics from device. Return @storage. * The device driver may provide its own method by setting * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats; * otherwise the internal statistics structure is used. */struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, struct rtnl_link_stats64 *storage){ const struct net_device_ops *ops = dev->netdev_ops; const struct net_device_core_stats __percpu *p;
/* * IPv{4,6} and udp tunnels share common stat helpers and use * different stat type (NETDEV_PCPU_STAT_TSTATS vs * NETDEV_PCPU_STAT_DSTATS). Ensure the accounting is consistent. */ BUILD_BUG_ON(offsetof(struct pcpu_sw_netstats, rx_bytes) != offsetof(struct pcpu_dstats, rx_bytes)); BUILD_BUG_ON(offsetof(struct pcpu_sw_netstats, rx_packets) != offsetof(struct pcpu_dstats, rx_packets)); BUILD_BUG_ON(offsetof(struct pcpu_sw_netstats, tx_bytes) != offsetof(struct pcpu_dstats, tx_bytes)); BUILD_BUG_ON(offsetof(struct pcpu_sw_netstats, tx_packets) != offsetof(struct pcpu_dstats, tx_packets));
if (ops->ndo_get_stats64) { memset(storage, 0, sizeof(*storage)); ops->ndo_get_stats64(dev, storage); } else if (ops->ndo_get_stats) { netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev)); } else if (dev->pcpu_stat_type == NETDEV_PCPU_STAT_TSTATS) { dev_get_tstats64(dev, storage); } else if (dev->pcpu_stat_type == NETDEV_PCPU_STAT_DSTATS) { dev_get_dstats64(dev, storage); } else { netdev_stats_to_stats64(storage, &dev->stats); }
/* This READ_ONCE() pairs with the write in netdev_core_stats_alloc() */ p = READ_ONCE(dev->core_stats); if (p) { const struct net_device_core_stats *core_stats; int i;
for_each_possible_cpu(i) { core_stats = per_cpu_ptr(p, i); storage->rx_dropped += READ_ONCE(core_stats->rx_dropped); storage->tx_dropped += READ_ONCE(core_stats->tx_dropped); storage->rx_nohandler += READ_ONCE(core_stats->rx_nohandler); storage->rx_otherhost_dropped += READ_ONCE(core_stats->rx_otherhost_dropped); } } return storage;}EXPORT_SYMBOL(dev_get_stats);
/** * dev_fetch_sw_netstats - get per-cpu network device statistics * @s: place to store stats * @netstats: per-cpu network stats to read from * * Read per-cpu network statistics and populate the related fields in @s. */void dev_fetch_sw_netstats(struct rtnl_link_stats64 *s, const struct pcpu_sw_netstats __percpu *netstats){ int cpu;
for_each_possible_cpu(cpu) { u64 rx_packets, rx_bytes, tx_packets, tx_bytes; const struct pcpu_sw_netstats *stats; unsigned int start;
stats = per_cpu_ptr(netstats, cpu); do { start = u64_stats_fetch_begin(&stats->syncp); rx_packets = u64_stats_read(&stats->rx_packets); rx_bytes = u64_stats_read(&stats->rx_bytes); tx_packets = u64_stats_read(&stats->tx_packets); tx_bytes = u64_stats_read(&stats->tx_bytes); } while (u64_stats_fetch_retry(&stats->syncp, start));
s->rx_packets += rx_packets; s->rx_bytes += rx_bytes; s->tx_packets += tx_packets; s->tx_bytes += tx_bytes; }}EXPORT_SYMBOL_GPL(dev_fetch_sw_netstats);
/** * dev_get_tstats64 - ndo_get_stats64 implementation * @dev: device to get statistics from * @s: place to store stats * * Populate @s from dev->stats and dev->tstats. Can be used as * ndo_get_stats64() callback. */void dev_get_tstats64(struct net_device *dev, struct rtnl_link_stats64 *s){ netdev_stats_to_stats64(s, &dev->stats); dev_fetch_sw_netstats(s, dev->tstats);}EXPORT_SYMBOL_GPL(dev_get_tstats64);
struct netdev_queue *dev_ingress_queue_create(struct net_device *dev){ struct netdev_queue *queue = dev_ingress_queue(dev);
#ifdef CONFIG_NET_CLS_ACT if (queue) return queue; queue = kzalloc_obj(*queue); if (!queue) return NULL; netdev_init_one_queue(dev, queue, NULL); RCU_INIT_POINTER(queue->qdisc, &noop_qdisc); RCU_INIT_POINTER(queue->qdisc_sleeping, &noop_qdisc); rcu_assign_pointer(dev->ingress_queue, queue);#endif return queue;}
static const struct ethtool_ops default_ethtool_ops;
void netdev_set_default_ethtool_ops(struct net_device *dev, const struct ethtool_ops *ops){ if (dev->ethtool_ops == &default_ethtool_ops) dev->ethtool_ops = ops;}EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops);
/** * netdev_sw_irq_coalesce_default_on() - enable SW IRQ coalescing by default * @dev: netdev to enable the IRQ coalescing on * * Sets a conservative default for SW IRQ coalescing. Users can use * sysfs attributes to override the default values. */void netdev_sw_irq_coalesce_default_on(struct net_device *dev){ WARN_ON(dev->reg_state == NETREG_REGISTERED);
if (!IS_ENABLED(CONFIG_PREEMPT_RT)) { netdev_set_gro_flush_timeout(dev, 20000); netdev_set_defer_hard_irqs(dev, 1); }}EXPORT_SYMBOL_GPL(netdev_sw_irq_coalesce_default_on);
/** * alloc_netdev_mqs - allocate network device * @sizeof_priv: size of private data to allocate space for * @name: device name format string * @name_assign_type: origin of device name * @setup: callback to initialize device * @txqs: the number of TX subqueues to allocate * @rxqs: the number of RX subqueues to allocate * * Allocates a struct net_device with private data area for driver use * and performs basic initialization. Also allocates subqueue structs * for each queue on the device. */struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, unsigned char name_assign_type, void (*setup)(struct net_device *), unsigned int txqs, unsigned int rxqs){ struct net_device *dev; size_t napi_config_sz; unsigned int maxqs;
BUG_ON(strlen(name) >= sizeof(dev->name));
if (txqs < 1) { pr_err("alloc_netdev: Unable to allocate device with zero queues\n"); return NULL; }
if (rxqs < 1) { pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n"); return NULL; }
maxqs = max(txqs, rxqs);
dev = kvzalloc_flex(*dev, priv, sizeof_priv, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL); if (!dev) return NULL;
dev->priv_len = sizeof_priv;
ref_tracker_dir_init(&dev->refcnt_tracker, 128, "netdev");#ifdef CONFIG_PCPU_DEV_REFCNT dev->pcpu_refcnt = alloc_percpu(int); if (!dev->pcpu_refcnt) goto free_dev; __dev_hold(dev);#else refcount_set(&dev->dev_refcnt, 1);#endif
if (dev_addr_init(dev)) goto free_pcpu;
dev_mc_init(dev); dev_uc_init(dev);
dev_net_set(dev, &init_net);
dev->gso_max_size = GSO_LEGACY_MAX_SIZE; dev->xdp_zc_max_segs = 1; dev->gso_max_segs = GSO_MAX_SEGS; dev->gro_max_size = GRO_LEGACY_MAX_SIZE; dev->gso_ipv4_max_size = GSO_LEGACY_MAX_SIZE; dev->gro_ipv4_max_size = GRO_LEGACY_MAX_SIZE; dev->tso_max_size = TSO_LEGACY_MAX_SIZE; dev->tso_max_segs = TSO_MAX_SEGS; dev->upper_level = 1; dev->lower_level = 1;#ifdef CONFIG_LOCKDEP dev->nested_level = 0; INIT_LIST_HEAD(&dev->unlink_list);#endif
INIT_LIST_HEAD(&dev->napi_list); INIT_LIST_HEAD(&dev->unreg_list);#ifdef CONFIG_DEBUG_NET_SMALL_RTNL INIT_LIST_HEAD(&dev->unreg_list_net);#endif INIT_LIST_HEAD(&dev->close_list); INIT_LIST_HEAD(&dev->link_watch_list); INIT_LIST_HEAD(&dev->adj_list.upper); INIT_LIST_HEAD(&dev->adj_list.lower); INIT_LIST_HEAD(&dev->ptype_all); INIT_LIST_HEAD(&dev->ptype_specific); INIT_LIST_HEAD(&dev->net_notifier_list); INIT_LIST_HEAD(&dev->work_node);#ifdef CONFIG_NET_SCHED hash_init(dev->qdisc_hash);#endif
mutex_init(&dev->lock); netif_rx_mode_init(dev);
dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM; setup(dev);
if (!dev->tx_queue_len) { dev->priv_flags |= IFF_NO_QUEUE; dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; }
dev->num_tx_queues = txqs; dev->real_num_tx_queues = txqs; if (netif_alloc_netdev_queues(dev)) goto free_all;
dev->num_rx_queues = rxqs; dev->real_num_rx_queues = rxqs; if (netif_alloc_rx_queues(dev)) goto free_all; dev->ethtool = kzalloc_obj(*dev->ethtool, GFP_KERNEL_ACCOUNT); if (!dev->ethtool) goto free_all;
dev->cfg = kzalloc_obj(*dev->cfg, GFP_KERNEL_ACCOUNT); if (!dev->cfg) goto free_all; dev->cfg_pending = dev->cfg;
dev->num_napi_configs = maxqs; napi_config_sz = array_size(maxqs, sizeof(*dev->napi_config)); dev->napi_config = kvzalloc(napi_config_sz, GFP_KERNEL_ACCOUNT); if (!dev->napi_config) goto free_all;
strscpy(dev->name, name); dev->name_assign_type = name_assign_type; dev->group = INIT_NETDEV_GROUP; if (!dev->ethtool_ops) dev->ethtool_ops = &default_ethtool_ops;
nf_hook_netdev_init(dev);
return dev;
free_all: free_netdev(dev); return NULL;
free_pcpu:#ifdef CONFIG_PCPU_DEV_REFCNT free_percpu(dev->pcpu_refcnt);free_dev:#endif ref_tracker_dir_exit(&dev->refcnt_tracker); kvfree(dev); return NULL;}EXPORT_SYMBOL(alloc_netdev_mqs);
static void netdev_napi_exit(struct net_device *dev){ if (!list_empty(&dev->napi_list)) { struct napi_struct *p, *n;
netdev_lock(dev); list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) __netif_napi_del_locked(p); netdev_unlock(dev);
synchronize_net(); }
kvfree(dev->napi_config);}
/** * free_netdev - free network device * @dev: device * * This function does the last stage of destroying an allocated device * interface. The reference to the device object is released. If this * is the last reference then it will be freed.Must be called in process * context. */void free_netdev(struct net_device *dev){ might_sleep();
/* When called immediately after register_netdevice() failed the unwind * handling may still be dismantling the device. Handle that case by * deferring the free. */ if (dev->reg_state == NETREG_UNREGISTERING) { ASSERT_RTNL(); dev->needs_free_netdev = true; return; }
WARN_ON(dev->cfg != dev->cfg_pending); kfree(dev->cfg); kfree(dev->ethtool); netif_free_tx_queues(dev); netif_free_rx_queues(dev);
kfree(rcu_dereference_protected(dev->ingress_queue, 1));
__hw_addr_flush(&dev->rx_mode_addr_cache);
/* Flush device addresses */ dev_addr_flush(dev);
netdev_napi_exit(dev);
netif_del_cpu_rmap(dev);
ref_tracker_dir_exit(&dev->refcnt_tracker);#ifdef CONFIG_PCPU_DEV_REFCNT free_percpu(dev->pcpu_refcnt); dev->pcpu_refcnt = NULL;#endif free_percpu(dev->core_stats); dev->core_stats = NULL; free_percpu(dev->xdp_bulkq); dev->xdp_bulkq = NULL;
netdev_free_phy_link_topology(dev);
mutex_destroy(&dev->lock);
/* Compatibility with error handling in drivers */ if (dev->reg_state == NETREG_UNINITIALIZED || dev->reg_state == NETREG_DUMMY) { kvfree(dev); return; }
BUG_ON(dev->reg_state != NETREG_UNREGISTERED); WRITE_ONCE(dev->reg_state, NETREG_RELEASED);
/* will free via device release */ put_device(&dev->dev);}EXPORT_SYMBOL(free_netdev);
/** * alloc_netdev_dummy - Allocate and initialize a dummy net device. * @sizeof_priv: size of private data to allocate space for * * Return: the allocated net_device on success, NULL otherwise */struct net_device *alloc_netdev_dummy(int sizeof_priv){ return alloc_netdev(sizeof_priv, "dummy#", NET_NAME_UNKNOWN, init_dummy_netdev);}EXPORT_SYMBOL_GPL(alloc_netdev_dummy);
/** * synchronize_net - Synchronize with packet receive processing * * Wait for packets currently being received to be done. * Does not block later packets from starting. */void synchronize_net(void){ might_sleep(); if (from_cleanup_net() || rtnl_is_locked()) synchronize_rcu_expedited(); else synchronize_rcu();}EXPORT_SYMBOL(synchronize_net);
static void netdev_rss_contexts_free(struct net_device *dev){ struct ethtool_rxfh_context *ctx; unsigned long context;
mutex_lock(&dev->ethtool->rss_lock); xa_for_each(&dev->ethtool->rss_ctx, context, ctx) { xa_erase(&dev->ethtool->rss_ctx, context); dev->ethtool_ops->remove_rxfh_context(dev, ctx, context, NULL); kfree(ctx); } xa_destroy(&dev->ethtool->rss_ctx); mutex_unlock(&dev->ethtool->rss_lock);}
/** * unregister_netdevice_queue - remove device from the kernel * @dev: device * @head: list * * This function shuts down a device interface and removes it * from the kernel tables. * If head not NULL, device is queued to be unregistered later. * * Callers must hold the rtnl semaphore. You may want * unregister_netdev() instead of this. */
void unregister_netdevice_queue(struct net_device *dev, struct list_head *head){ ASSERT_RTNL();
#ifdef CONFIG_DEBUG_NET_SMALL_RTNL DEBUG_NET_WARN_ON_ONCE(!list_empty(&dev->unreg_list_net));#endif
if (head) { list_move_tail(&dev->unreg_list, head); } else { LIST_HEAD(single);
list_add(&dev->unreg_list, &single); unregister_netdevice_many(&single); }}EXPORT_SYMBOL(unregister_netdevice_queue);
static void dev_memory_provider_uninstall(struct net_device *dev){ unsigned int i;
for (i = 0; i < dev->real_num_rx_queues; i++) { struct netdev_rx_queue *rxq = &dev->_rx[i];
__netif_mp_uninstall_rxq(rxq, &rxq->mp_params); }}
/* devices must be UP and netdev_lock()'d */static void netif_close_many_and_unlock(struct list_head *close_head){ struct net_device *dev, *tmp;
netif_close_many(close_head, false);
/* ... now unlock them */ list_for_each_entry_safe(dev, tmp, close_head, close_list) { netdev_unlock(dev); list_del_init(&dev->close_list); }}
static void netif_close_many_and_unlock_cond(struct list_head *close_head){#ifdef CONFIG_LOCKDEP /* We can only track up to MAX_LOCK_DEPTH locks per task. * * Reserve half the available slots for additional locks possibly * taken by notifiers and (soft)irqs. */ unsigned int limit = MAX_LOCK_DEPTH / 2;
if (lockdep_depth(current) > limit) netif_close_many_and_unlock(close_head);#endif}
bool unregister_netdevice_queued(const struct net_device *dev){ ASSERT_RTNL(); return !list_empty(&dev->unreg_list);}
void unregister_netdevice_many_notify(struct list_head *head, u32 portid, const struct nlmsghdr *nlh){ struct net_device *dev, *tmp; LIST_HEAD(close_head); int cnt = 0;
BUG_ON(dev_boot_phase); ASSERT_RTNL();
if (list_empty(head)) return;
list_for_each_entry_safe(dev, tmp, head, unreg_list) { /* Some devices call without registering * for initialization unwind. Remove those * devices and proceed with the remaining. */ if (dev->reg_state == NETREG_UNINITIALIZED) { pr_debug("unregister_netdevice: device %s/%p never was registered\n", dev->name, dev);
WARN_ON(1); list_del(&dev->unreg_list); continue; } dev->dismantle = true; BUG_ON(dev->reg_state != NETREG_REGISTERED); }
/* If device is running, close it first. Start with ops locked... */ list_for_each_entry(dev, head, unreg_list) { if (!(dev->flags & IFF_UP)) continue; if (netdev_need_ops_lock(dev)) { list_add_tail(&dev->close_list, &close_head); netdev_lock(dev); } netif_close_many_and_unlock_cond(&close_head); } netif_close_many_and_unlock(&close_head); /* ... now go over the rest. */ list_for_each_entry(dev, head, unreg_list) { if (!netdev_need_ops_lock(dev)) list_add_tail(&dev->close_list, &close_head); } netif_close_many(&close_head, true);
list_for_each_entry(dev, head, unreg_list) { /* And unlink it from device chain. */ unlist_netdevice(dev); netdev_lock(dev); WRITE_ONCE(dev->reg_state, NETREG_UNREGISTERING); netdev_unlock(dev); } flush_all_backlogs();
synchronize_net();
list_for_each_entry(dev, head, unreg_list) { struct sk_buff *skb = NULL;
/* Shutdown queueing discipline. */ netdev_lock_ops(dev); dev_shutdown(dev); dev_tcx_uninstall(dev); dev_xdp_uninstall(dev); dev_memory_provider_uninstall(dev); netdev_work_cancel_all(dev); netdev_unlock_ops(dev); bpf_dev_bound_netdev_unregister(dev);
netdev_offload_xstats_disable_all(dev);
/* Notify protocols, that we are about to destroy * this device. They should clean all the things. */ call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
if (!(dev->rtnl_link_ops && dev->rtnl_link_initializing)) skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U, 0, GFP_KERNEL, NULL, 0, portid, nlh);
/* * Flush the unicast and multicast chains */ dev_uc_flush(dev); dev_mc_flush(dev);
netdev_rss_contexts_free(dev);
call_netdevice_notifiers(NETDEV_PRE_UNINIT, dev);
if (dev->netdev_ops->ndo_uninit) dev->netdev_ops->ndo_uninit(dev);
mutex_destroy(&dev->ethtool->rss_lock);
net_shaper_flush_netdev(dev);
if (skb) rtmsg_ifinfo_send(skb, dev, GFP_KERNEL, portid, nlh);
/* Notifier chain MUST detach us all upper devices. */ WARN_ON(netdev_has_any_upper_dev(dev)); WARN_ON(netdev_has_any_lower_dev(dev));
/* Remove entries from kobject tree */ netdev_unregister_kobject(dev);#ifdef CONFIG_XPS /* Remove XPS queueing entries */ netif_reset_xps_queues_gt(dev, 0);#endif }
synchronize_net();
list_for_each_entry(dev, head, unreg_list) {#ifdef CONFIG_DEBUG_NET_SMALL_RTNL struct net *net = dev_net(dev);
/* spin_lock() can be moved outside of the loop * once the per-netns RTNL conversion completes. */ spin_lock(&net->dev_unreg_lock); list_del(&dev->unreg_list_net); spin_unlock(&net->dev_unreg_lock);#endif netdev_put(dev, &dev->dev_registered_tracker); net_set_todo(dev); cnt++; } atomic_add(cnt, &dev_unreg_count);
list_del(head);}
/** * unregister_netdevice_many - unregister many devices * @head: list of devices * * Note: As most callers use a stack allocated list_head, * we force a list_del() to make sure stack won't be corrupted later. */void unregister_netdevice_many(struct list_head *head){ unregister_netdevice_many_notify(head, 0, NULL);}EXPORT_SYMBOL(unregister_netdevice_many);
#ifdef CONFIG_DEBUG_NET_SMALL_RTNLvoid unregister_netdevice_queue_net(struct net *net, struct net_device *dev, struct list_head *head){ netdev_lock(dev);
if (net_eq(dev_net(dev), net)) { netdev_unlock(dev); unregister_netdevice_queue(dev, head); return; }
net = dev_net(dev);
spin_lock(&net->dev_unreg_lock);
DEBUG_NET_WARN_ON_ONCE(!list_empty(&dev->unreg_list)); DEBUG_NET_WARN_ON_ONCE(!list_empty(&dev->unreg_list_net));
list_add_tail(&dev->unreg_list_net, &net->dev_unreg_head); rtnl_net_queue_work(net);
spin_unlock(&net->dev_unreg_lock);
netdev_unlock(dev);}EXPORT_SYMBOL(unregister_netdevice_queue_net);
void unregister_netdevice_queue_many_net(struct net *net, struct list_head *head){ struct net_device *dev, *tmp;
spin_lock(&net->dev_unreg_lock); list_for_each_entry_safe(dev, tmp, head, unreg_list) { /* Once all cross-netns unregister_netdevice_queue() is * converted to _net() (or for debugging), remove this check. */ if (!net_eq(dev_net(dev), net)) continue;
DEBUG_NET_WARN_ONCE(!net_eq(dev_net(dev), net), "%s was unregistered from a different netns.\n", dev->name);
list_del_init(&dev->unreg_list); list_move_tail(&dev->unreg_list_net, &net->dev_unreg_head); } spin_unlock(&net->dev_unreg_lock);}
static void unregister_netdevice_move_net(struct net *net_old, struct net *net, struct net_device *dev){ if (net_old > net) { spin_lock(&net->dev_unreg_lock); spin_lock_nested(&net_old->dev_unreg_lock, SINGLE_DEPTH_NESTING); } else { spin_lock(&net_old->dev_unreg_lock); spin_lock_nested(&net->dev_unreg_lock, SINGLE_DEPTH_NESTING); }
if (!list_empty(&dev->unreg_list_net)) { list_del(&dev->unreg_list_net); list_add_tail(&dev->unreg_list_net, &net->dev_unreg_head); }
spin_unlock(&net_old->dev_unreg_lock); spin_unlock(&net->dev_unreg_lock);}
void unregister_netdevice_many_net(struct net *net){ struct net_device *dev, *tmp; LIST_HEAD(unreg_head_net); LIST_HEAD(unreg_head);
spin_lock(&net->dev_unreg_lock); list_splice_init(&net->dev_unreg_head, &unreg_head_net); spin_unlock(&net->dev_unreg_lock);
list_for_each_entry_safe(dev, tmp, &unreg_head_net, unreg_list_net) { list_del_init(&dev->unreg_list_net); list_add_tail(&dev->unreg_list, &unreg_head); }
unregister_netdevice_many(&unreg_head);}#endif
/** * unregister_netdev - remove device from the kernel * @dev: device * * This function shuts down a device interface and removes it * from the kernel tables. * * This is just a wrapper for unregister_netdevice that takes * the rtnl semaphore. In general you want to use this and not * unregister_netdevice. */void unregister_netdev(struct net_device *dev){ rtnl_net_dev_lock(dev); unregister_netdevice(dev); rtnl_net_dev_unlock(dev);}EXPORT_SYMBOL(unregister_netdev);
int __dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat, int new_ifindex, struct netlink_ext_ack *extack){ struct netdev_name_node *name_node, *tmp; struct net *net_old = dev_net(dev); char new_name[IFNAMSIZ] = {}; int err, new_nsid;
ASSERT_RTNL();
/* Don't allow namespace local devices to be moved. */ err = -EINVAL; if (dev->netns_immutable) { NL_SET_ERR_MSG(extack, "The interface netns is immutable"); goto out; }
/* Ensure the device has been registered */ if (dev->reg_state != NETREG_REGISTERED) { NL_SET_ERR_MSG(extack, "The interface isn't registered"); goto out; }
/* Get out if there is nothing todo */ err = 0; if (net_eq(net_old, net)) goto out;
/* Pick the destination device name, and ensure * we can use it in the destination network namespace. */ err = -EEXIST; if (netdev_name_in_use(net, dev->name)) { /* We get here if we can't use the current device name */ if (!pat) { NL_SET_ERR_MSG(extack, "An interface with the same name exists in the target netns"); goto out; } err = dev_prep_valid_name(net, dev, pat, new_name, EEXIST); if (err < 0) { NL_SET_ERR_MSG_FMT(extack, "Unable to use '%s' for the new interface name in the target netns", pat); goto out; } } /* Check that none of the altnames conflicts. */ err = -EEXIST; netdev_for_each_altname_safe(dev, name_node, tmp) { if (!netdev_name_in_use(net, name_node->name)) continue;
if (!check_net(net_old)) { __netdev_name_node_alt_destroy(name_node); continue; }
NL_SET_ERR_MSG_FMT(extack, "An interface with the altname %s exists in the target netns", name_node->name); goto out; }
/* Check that new_ifindex isn't used yet. */ if (new_ifindex) { err = dev_index_reserve(net, new_ifindex); if (err < 0) { NL_SET_ERR_MSG_FMT(extack, "The ifindex %d is not available in the target netns", new_ifindex); goto out; } } else { /* If there is an ifindex conflict assign a new one */ err = dev_index_reserve(net, dev->ifindex); if (err == -EBUSY) err = dev_index_reserve(net, 0); if (err < 0) { NL_SET_ERR_MSG(extack, "Unable to allocate a new ifindex in the target netns"); goto out; } new_ifindex = err; }
/* * And now a mini version of register_netdevice unregister_netdevice. */
netdev_lock_ops(dev); /* If device is running close it first. */ netif_close(dev); /* And unlink it from device chain */ unlist_netdevice(dev);
if (!netdev_need_ops_lock(dev)) netdev_lock(dev); dev->moving_ns = true; netdev_unlock(dev);
synchronize_net();
/* Shutdown queueing discipline. */ netdev_lock_ops(dev); dev_shutdown(dev); netdev_unlock_ops(dev);
/* Notify protocols, that we are about to destroy * this device. They should clean all the things. * * Note that dev->reg_state stays at NETREG_REGISTERED. * This is wanted because this way 8021q and macvlan know * the device is just moving and can keep their slaves up. */ call_netdevice_notifiers(NETDEV_UNREGISTER, dev); rcu_barrier();
new_nsid = peernet2id_alloc(dev_net(dev), net, GFP_KERNEL);
rtmsg_ifinfo_newnet(RTM_DELLINK, dev, ~0U, GFP_KERNEL, &new_nsid, new_ifindex);
/* * Flush the unicast and multicast chains */ dev_uc_flush(dev); dev_mc_flush(dev);
/* Send a netdev-removed uevent to the old namespace */ kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE); netdev_adjacent_del_links(dev);
/* Move per-net netdevice notifiers that are following the netdevice */ move_netdevice_notifiers_dev_net(dev, net);
/* Actually switch the network namespace */ netdev_lock(dev); dev_net_set(dev, net); netdev_unlock(dev); dev->ifindex = new_ifindex;
#ifdef CONFIG_DEBUG_NET_SMALL_RTNL unregister_netdevice_move_net(net_old, net, dev);#endif
if (new_name[0]) { /* Rename the netdev to prepared name */ write_seqlock_bh(&netdev_rename_lock); strscpy(dev->name, new_name, IFNAMSIZ); write_sequnlock_bh(&netdev_rename_lock); }
/* Fixup kobjects */ dev_set_uevent_suppress(&dev->dev, 1); err = device_rename(&dev->dev, dev->name); dev_set_uevent_suppress(&dev->dev, 0); WARN_ON(err);
/* Send a netdev-add uevent to the new namespace */ kobject_uevent(&dev->dev.kobj, KOBJ_ADD); netdev_adjacent_add_links(dev);
/* Adapt owner in case owning user namespace of target network * namespace is different from the original one. */ err = netdev_change_owner(dev, net_old, net); WARN_ON(err);
netdev_lock(dev); dev->moving_ns = false; if (!netdev_need_ops_lock(dev)) netdev_unlock(dev);
/* Add the device back in the hashes */ list_netdevice(dev); /* Notify protocols, that a new device appeared. */ call_netdevice_notifiers(NETDEV_REGISTER, dev); netdev_unlock_ops(dev);
/* * Prevent userspace races by waiting until the network * device is fully setup before sending notifications. */ rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL, 0, NULL);
synchronize_net(); err = 0;out: return err;}
static int dev_cpu_dead(unsigned int oldcpu){ struct sk_buff **list_skb; struct sk_buff *skb; unsigned int cpu; int node; struct softnet_data *sd, *oldsd, *remsd = NULL;
local_irq_disable(); cpu = smp_processor_id(); sd = &per_cpu(softnet_data, cpu); oldsd = &per_cpu(softnet_data, oldcpu);
/* Find end of our completion_queue. */ list_skb = &sd->completion_queue; while (*list_skb) list_skb = &(*list_skb)->next; /* Append completion queue from offline CPU. */ *list_skb = oldsd->completion_queue; oldsd->completion_queue = NULL;
/* Append output queue from offline CPU. */ if (oldsd->output_queue) { *sd->output_queue_tailp = oldsd->output_queue; sd->output_queue_tailp = oldsd->output_queue_tailp; oldsd->output_queue = NULL; oldsd->output_queue_tailp = &oldsd->output_queue; } /* Append NAPI poll list from offline CPU, with one exception : * process_backlog() must be called by cpu owning percpu backlog. * We properly handle process_queue & input_pkt_queue later. */ while (!list_empty(&oldsd->poll_list)) { struct napi_struct *napi = list_first_entry(&oldsd->poll_list, struct napi_struct, poll_list);
list_del_init(&napi->poll_list); if (napi->poll == process_backlog) napi->state &= NAPIF_STATE_THREADED; else ____napi_schedule(sd, napi); }
raise_softirq_irqoff(NET_TX_SOFTIRQ); local_irq_enable();
if (!use_backlog_threads()) {#ifdef CONFIG_RPS remsd = oldsd->rps_ipi_list; oldsd->rps_ipi_list = NULL;#endif /* send out pending IPI's on offline CPU */ net_rps_send_ipi(remsd); }
/* Process offline CPU's input_pkt_queue */ while ((skb = __skb_dequeue(&oldsd->process_queue))) { netif_rx(skb); rps_input_queue_head_incr(oldsd); } while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) { netif_rx(skb); rps_input_queue_head_incr(oldsd); }
for_each_node(node) skb_defer_node_flush(per_cpu_ptr(net_hotdata.skb_defer_nodes, oldcpu) + node); node = cpu_to_node(oldcpu); if (node_possible(node) && !cpumask_intersects(cpumask_of_node(node), cpu_online_mask)) { for_each_possible_cpu(cpu) skb_defer_node_flush(per_cpu_ptr(net_hotdata.skb_defer_nodes, cpu) + node); }
return 0;}
/** * netdev_increment_features - increment feature set by one * @all: current feature set * @one: new feature set * @mask: mask feature set * * Computes a new feature set after adding a device with feature set * @one to the master device with current feature set @all. Will not * enable anything that is off in @mask. Returns the new feature set. */netdev_features_t netdev_increment_features(netdev_features_t all, netdev_features_t one, netdev_features_t mask){ if (mask & NETIF_F_HW_CSUM) mask |= NETIF_F_CSUM_MASK; mask |= NETIF_F_VLAN_CHALLENGED;
all |= one & (NETIF_F_ONE_FOR_ALL | NETIF_F_CSUM_MASK) & mask; all &= one | ~NETIF_F_ALL_FOR_ALL;
/* If one device supports hw checksumming, set for all. */ if (all & NETIF_F_HW_CSUM) all &= ~(NETIF_F_CSUM_MASK & ~NETIF_F_HW_CSUM);
return all;}EXPORT_SYMBOL(netdev_increment_features);
/** * netdev_compute_master_upper_features - compute feature from lowers * @dev: the upper device * @update_header: whether to update upper device's header_len/headroom/tailroom * * Recompute the upper device's feature based on all lower devices. */void netdev_compute_master_upper_features(struct net_device *dev, bool update_header){ unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM; netdev_features_t gso_partial_features = MASTER_UPPER_DEV_GSO_PARTIAL_FEATURES; netdev_features_t xfrm_features = MASTER_UPPER_DEV_XFRM_FEATURES; netdev_features_t mpls_features = MASTER_UPPER_DEV_MPLS_FEATURES; netdev_features_t vlan_features = MASTER_UPPER_DEV_VLAN_FEATURES; netdev_features_t enc_features = MASTER_UPPER_DEV_ENC_FEATURES; unsigned short max_header_len = ETH_HLEN; unsigned int tso_max_size = TSO_MAX_SIZE; unsigned short max_headroom = 0; unsigned short max_tailroom = 0; u16 tso_max_segs = TSO_MAX_SEGS; struct net_device *lower_dev; struct list_head *iter;
mpls_features = netdev_base_features(mpls_features); vlan_features = netdev_base_features(vlan_features); enc_features = netdev_base_features(enc_features);
netdev_for_each_lower_dev(dev, lower_dev, iter) { gso_partial_features = netdev_increment_features(gso_partial_features, lower_dev->gso_partial_features, MASTER_UPPER_DEV_GSO_PARTIAL_FEATURES);
vlan_features = netdev_increment_features(vlan_features, lower_dev->vlan_features, MASTER_UPPER_DEV_VLAN_FEATURES);
enc_features = netdev_increment_features(enc_features, lower_dev->hw_enc_features, MASTER_UPPER_DEV_ENC_FEATURES);
if (IS_ENABLED(CONFIG_XFRM_OFFLOAD)) xfrm_features = netdev_increment_features(xfrm_features, lower_dev->hw_enc_features, MASTER_UPPER_DEV_XFRM_FEATURES);
mpls_features = netdev_increment_features(mpls_features, lower_dev->mpls_features, MASTER_UPPER_DEV_MPLS_FEATURES);
dst_release_flag &= lower_dev->priv_flags;
if (update_header) { max_header_len = max(max_header_len, lower_dev->hard_header_len); max_headroom = max(max_headroom, lower_dev->needed_headroom); max_tailroom = max(max_tailroom, lower_dev->needed_tailroom); }
tso_max_size = min(tso_max_size, lower_dev->tso_max_size); tso_max_segs = min(tso_max_segs, lower_dev->tso_max_segs); }
dev->gso_partial_features = gso_partial_features; dev->vlan_features = vlan_features; dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; if (IS_ENABLED(CONFIG_XFRM_OFFLOAD)) dev->hw_enc_features |= xfrm_features; dev->mpls_features = mpls_features;
dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; if ((dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) dev->priv_flags |= IFF_XMIT_DST_RELEASE;
if (update_header) { dev->hard_header_len = max_header_len; dev->needed_headroom = max_headroom; dev->needed_tailroom = max_tailroom; }
netif_set_tso_max_segs(dev, tso_max_segs); netif_set_tso_max_size(dev, tso_max_size);
netdev_change_features(dev);}EXPORT_SYMBOL(netdev_compute_master_upper_features);
static struct hlist_head * __net_init netdev_create_hash(void){ int i; struct hlist_head *hash;
hash = kmalloc_objs(*hash, NETDEV_HASHENTRIES); if (hash != NULL) for (i = 0; i < NETDEV_HASHENTRIES; i++) INIT_HLIST_HEAD(&hash[i]);
return hash;}
/* Initialize per network namespace state */static int __net_init netdev_init(struct net *net){ BUILD_BUG_ON(GRO_HASH_BUCKETS > BITS_PER_BYTE * sizeof_field(struct gro_node, bitmask));
INIT_LIST_HEAD(&net->dev_base_head);
net->dev_name_head = netdev_create_hash(); if (net->dev_name_head == NULL) goto err_name;
net->dev_index_head = netdev_create_hash(); if (net->dev_index_head == NULL) goto err_idx;
xa_init_flags(&net->dev_by_index, XA_FLAGS_ALLOC1);
RAW_INIT_NOTIFIER_HEAD(&net->netdev_chain);
return 0;
err_idx: kfree(net->dev_name_head);err_name: return -ENOMEM;}
/** * netdev_drivername - network driver for the device * @dev: network device * * Determine network driver for device. */const char *netdev_drivername(const struct net_device *dev){ const struct device_driver *driver; const struct device *parent; const char *empty = "";
parent = dev->dev.parent; if (!parent) return empty;
driver = parent->driver; if (driver && driver->name) return driver->name; return empty;}
static void __netdev_printk(const char *level, const struct net_device *dev, struct va_format *vaf){ if (dev && dev->dev.parent) { dev_printk_emit(level[1] - '0', dev->dev.parent, "%s %s %s%s: %pV", dev_driver_string(dev->dev.parent), dev_name(dev->dev.parent), netdev_name(dev), netdev_reg_state(dev), vaf); } else if (dev) { printk("%s%s%s: %pV", level, netdev_name(dev), netdev_reg_state(dev), vaf); } else { printk("%s(NULL net_device): %pV", level, vaf); }}
void netdev_printk(const char *level, const struct net_device *dev, const char *format, ...){ struct va_format vaf; va_list args;
va_start(args, format);
vaf.fmt = format; vaf.va = &args;
__netdev_printk(level, dev, &vaf);
va_end(args);}EXPORT_SYMBOL(netdev_printk);
#define define_netdev_printk_level(func, level) \void func(const struct net_device *dev, const char *fmt, ...) \{ \ struct va_format vaf; \ va_list args; \ \ va_start(args, fmt); \ \ vaf.fmt = fmt; \ vaf.va = &args; \ \ __netdev_printk(level, dev, &vaf); \ \ va_end(args); \} \EXPORT_SYMBOL(func);
define_netdev_printk_level(netdev_emerg, KERN_EMERG);define_netdev_printk_level(netdev_alert, KERN_ALERT);define_netdev_printk_level(netdev_crit, KERN_CRIT);define_netdev_printk_level(netdev_err, KERN_ERR);define_netdev_printk_level(netdev_warn, KERN_WARNING);define_netdev_printk_level(netdev_notice, KERN_NOTICE);define_netdev_printk_level(netdev_info, KERN_INFO);
static void __net_exit netdev_exit(struct net *net){ kfree(net->dev_name_head); kfree(net->dev_index_head); xa_destroy(&net->dev_by_index); if (net != &init_net) WARN_ON_ONCE(!list_empty(&net->dev_base_head));}
static struct pernet_operations __net_initdata netdev_net_ops = { .init = netdev_init, .exit = netdev_exit,};
static void __net_exit default_device_exit_net(struct net *net){ struct net_device *dev, *aux; /* * Push all migratable network devices back to the * initial network namespace */
for_each_netdev_safe(net, dev, aux) { int err; char fb_name[IFNAMSIZ];
/* Ignore unmoveable devices (i.e. loopback) */ if (dev->netns_immutable) continue;
/* Leave virtual devices for the generic cleanup */ if (dev->rtnl_link_ops && !dev->rtnl_link_ops->netns_refund) continue;
/* Push remaining network devices to init_net */ snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); if (netdev_name_in_use(&init_net, fb_name)) snprintf(fb_name, IFNAMSIZ, "dev%%d");
err = dev_change_net_namespace(dev, &init_net, fb_name); if (err) { pr_emerg("%s: failed to move %s to init_net: %d\n", __func__, dev->name, err); BUG(); } }}
static void __net_exit default_device_exit_batch(struct list_head *net_list){ /* At exit all network devices most be removed from a network * namespace. Do this in the reverse order of registration. * Do this across as many network namespaces as possible to * improve batching efficiency. */ struct net_device *dev; struct net *net; LIST_HEAD(dev_kill_list);
rtnl_lock();
__rtnl_net_lock(&init_net);
list_for_each_entry(net, net_list, exit_list) { __rtnl_net_lock(net); default_device_exit_net(net); __rtnl_net_unlock(net);
cond_resched(); }
__rtnl_net_unlock(&init_net);
list_for_each_entry(net, net_list, exit_list) { __rtnl_net_lock(net);
for_each_netdev_reverse(net, dev) { if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) dev->rtnl_link_ops->dellink(dev, &dev_kill_list); else unregister_netdevice_queue(dev, &dev_kill_list); }
unregister_netdevice_queue_many_net(net, &dev_kill_list); __rtnl_net_unlock(net); } unregister_netdevice_many(&dev_kill_list); rtnl_unlock();
rtnl_net_flush_workqueue();}
static struct pernet_operations __net_initdata default_device_ops = { .exit_batch = default_device_exit_batch,};
static void __init net_dev_struct_check(void){ /* TX read-mostly hotpath */ CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, priv_flags_fast); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, netdev_ops); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, header_ops); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, _tx); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, real_num_tx_queues); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_max_size); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_ipv4_max_size); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_max_segs); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_partial_features); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, num_tc); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, mtu); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, needed_headroom); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, tc_to_txq);#ifdef CONFIG_XPS CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, xps_maps);#endif#ifdef CONFIG_NETFILTER_EGRESS CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, nf_hooks_egress);#endif#ifdef CONFIG_NET_XGRESS CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, tcx_egress);#endif CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_tx, 160);
/* TXRX read-mostly hotpath */ CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, lstats); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, state); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, flags); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, hard_header_len); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, features); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, ip6_ptr); CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_txrx, 46);
/* RX read-mostly hotpath */ CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, ptype_specific); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, ifindex); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, real_num_rx_queues); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, _rx); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, gro_max_size); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, gro_ipv4_max_size); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, rx_handler); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, rx_handler_data); CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, nd_net);#ifdef CONFIG_NETPOLL CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, npinfo);#endif#ifdef CONFIG_NET_XGRESS CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, tcx_ingress);#endif CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_rx, 92);}
/* * Initialize the DEV module. At boot time this walks the device list and * unhooks any devices that fail to initialise (normally hardware not * present) and leaves us with a valid list of present and active devices. * */
/* We allocate 256 pages for each CPU if PAGE_SHIFT is 12 */#define SYSTEM_PERCPU_PAGE_POOL_SIZE ((1 << 20) / PAGE_SIZE)
static int net_page_pool_create(int cpuid){#if IS_ENABLED(CONFIG_PAGE_POOL) struct page_pool_params page_pool_params = { .pool_size = SYSTEM_PERCPU_PAGE_POOL_SIZE, .flags = PP_FLAG_SYSTEM_POOL, .nid = cpu_to_mem(cpuid), }; struct page_pool *pp_ptr; int err;
pp_ptr = page_pool_create_percpu(&page_pool_params, cpuid); if (IS_ERR(pp_ptr)) return -ENOMEM;
err = xdp_reg_page_pool(pp_ptr); if (err) { page_pool_destroy(pp_ptr); return err; }
per_cpu(system_page_pool.pool, cpuid) = pp_ptr;#endif return 0;}
static int backlog_napi_should_run(unsigned int cpu){ struct softnet_data *sd = per_cpu_ptr(&softnet_data, cpu); struct napi_struct *napi = &sd->backlog;
return test_bit(NAPI_STATE_SCHED_THREADED, &napi->state);}
static void run_backlog_napi(unsigned int cpu){ struct softnet_data *sd = per_cpu_ptr(&softnet_data, cpu);
napi_threaded_poll_loop(&sd->backlog, NULL);}
static void backlog_napi_setup(unsigned int cpu){ struct softnet_data *sd = per_cpu_ptr(&softnet_data, cpu); struct napi_struct *napi = &sd->backlog;
napi->thread = this_cpu_read(backlog_napi); set_bit(NAPI_STATE_THREADED, &napi->state);}
static struct smp_hotplug_thread backlog_threads = { .store = &backlog_napi, .thread_should_run = backlog_napi_should_run, .thread_fn = run_backlog_napi, .thread_comm = "backlog_napi/%u", .setup = backlog_napi_setup,};
/* * This is called single threaded during boot, so no need * to take the rtnl semaphore. */static int __init net_dev_init(void){ int i, rc = -ENOMEM;
BUG_ON(!dev_boot_phase);
net_dev_struct_check();
if (dev_proc_init()) goto out;
if (netdev_kobject_init()) goto out;
for (i = 0; i < PTYPE_HASH_SIZE; i++) INIT_LIST_HEAD(&ptype_base[i]);
if (register_pernet_subsys(&netdev_net_ops)) goto out;
/* * Initialise the packet receive queues. */
flush_backlogs_fallback = flush_backlogs_alloc(); if (!flush_backlogs_fallback) goto out;
for_each_possible_cpu(i) { struct softnet_data *sd = &per_cpu(softnet_data, i);
skb_queue_head_init(&sd->input_pkt_queue); skb_queue_head_init(&sd->process_queue);#ifdef CONFIG_XFRM_OFFLOAD skb_queue_head_init(&sd->xfrm_backlog);#endif INIT_LIST_HEAD(&sd->poll_list); sd->output_queue_tailp = &sd->output_queue;#ifdef CONFIG_RPS INIT_CSD(&sd->csd, rps_trigger_softirq, sd); sd->cpu = i;#endif INIT_CSD(&sd->defer_csd, trigger_rx_softirq, sd);
gro_init(&sd->backlog.gro); sd->backlog.poll = process_backlog; sd->backlog.weight = weight_p; INIT_LIST_HEAD(&sd->backlog.poll_list);
if (net_page_pool_create(i)) goto out; } net_hotdata.skb_defer_nodes = __alloc_percpu(sizeof(struct skb_defer_node) * nr_node_ids, __alignof__(struct skb_defer_node)); if (!net_hotdata.skb_defer_nodes) goto out; if (use_backlog_threads()) smpboot_register_percpu_thread(&backlog_threads);
dev_boot_phase = 0;
/* The loopback device is special if any other network devices * is present in a network namespace the loopback device must * be present. Since we now dynamically allocate and free the * loopback device ensure this invariant is maintained by * keeping the loopback device as the first device on the * list of network devices. Ensuring the loopback devices * is the first device that appears and the last network device * that disappears. */ if (register_pernet_device(&loopback_net_ops)) goto out;
if (register_pernet_device(&default_device_ops)) goto out;
open_softirq(NET_TX_SOFTIRQ, net_tx_action); open_softirq(NET_RX_SOFTIRQ, net_rx_action);
rc = cpuhp_setup_state_nocalls(CPUHP_NET_DEV_DEAD, "net/dev:dead", NULL, dev_cpu_dead); WARN_ON(rc < 0); rc = 0;
/* avoid static key IPIs to isolated CPUs */ if (housekeeping_enabled(HK_TYPE_MISC)) net_enable_timestamp();out: if (rc < 0) { for_each_possible_cpu(i) { struct page_pool *pp_ptr;
pp_ptr = per_cpu(system_page_pool.pool, i); if (!pp_ptr) continue;
xdp_unreg_page_pool(pp_ptr); page_pool_destroy(pp_ptr); per_cpu(system_page_pool.pool, i) = NULL; } }
return rc;}
subsys_initcall(net_dev_init);