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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116/* SPDX-License-Identifier: GPL-2.0-only *//* * Generic HDLC support routines for Linux * * Copyright (C) 1999-2005 Krzysztof Halasa <khc@pm.waw.pl> */#ifndef __HDLC_H#define __HDLC_H
#include <linux/skbuff.h>#include <linux/netdevice.h>#include <linux/hdlc/ioctl.h>#include <uapi/linux/hdlc.h>
/* This structure is a private property of HDLC protocols. Hardware drivers have no interest here */
struct hdlc_proto { int (*open)(struct net_device *dev); void (*close)(struct net_device *dev); void (*start)(struct net_device *dev); /* if open & DCD */ void (*stop)(struct net_device *dev); /* if open & !DCD */ void (*detach)(struct net_device *dev); int (*ioctl)(struct net_device *dev, struct if_settings *ifs); __be16 (*type_trans)(struct sk_buff *skb, struct net_device *dev); int (*netif_rx)(struct sk_buff *skb); netdev_tx_t (*xmit)(struct sk_buff *skb, struct net_device *dev); struct module *module; struct hdlc_proto *next; /* next protocol in the list */};
/* Pointed to by netdev_priv(dev) */typedef struct hdlc_device { /* used by HDLC layer to take control over HDLC device from hw driver*/ int (*attach)(struct net_device *dev, unsigned short encoding, unsigned short parity);
/* hardware driver must handle this instead of dev->hard_start_xmit */ netdev_tx_t (*xmit)(struct sk_buff *skb, struct net_device *dev);
/* Things below are for HDLC layer internal use only */ const struct hdlc_proto *proto; int carrier; int open; spinlock_t state_lock; void *state; void *priv;} hdlc_device;
/* Exported from hdlc module */
/* Called by hardware driver when a user requests HDLC service */int hdlc_ioctl(struct net_device *dev, struct if_settings *ifs);
/* Must be used by hardware driver on module startup/exit */#define register_hdlc_device(dev) register_netdev(dev)void unregister_hdlc_device(struct net_device *dev);
void register_hdlc_protocol(struct hdlc_proto *proto);void unregister_hdlc_protocol(struct hdlc_proto *proto);
struct net_device *alloc_hdlcdev(void *priv);
static inline struct hdlc_device* dev_to_hdlc(struct net_device *dev){ return netdev_priv(dev);}
static __inline__ void debug_frame(const struct sk_buff *skb){ int i;
for (i=0; i < skb->len; i++) { if (i == 100) { printk("...\n"); return; } printk(" %02X", skb->data[i]); } printk("\n");}
/* Must be called by hardware driver when HDLC device is being opened */int hdlc_open(struct net_device *dev);/* Must be called by hardware driver when HDLC device is being closed */void hdlc_close(struct net_device *dev);/* Must be pointed to by hw driver's dev->netdev_ops->ndo_start_xmit */netdev_tx_t hdlc_start_xmit(struct sk_buff *skb, struct net_device *dev);
int attach_hdlc_protocol(struct net_device *dev, struct hdlc_proto *proto, size_t size);/* May be used by hardware driver to gain control over HDLC device */int detach_hdlc_protocol(struct net_device *dev);
static __inline__ __be16 hdlc_type_trans(struct sk_buff *skb, struct net_device *dev){ hdlc_device *hdlc = dev_to_hdlc(dev);
skb->dev = dev; skb_reset_mac_header(skb);
if (hdlc->proto->type_trans) return hdlc->proto->type_trans(skb, dev); else return htons(ETH_P_HDLC);}
#endif /* __HDLC_H */