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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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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162// SPDX-License-Identifier: GPL-2.0-or-later/* Copyright (c) 2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved. */
#include <net/devlink.h>
#include "devl_internal.h"
static LIST_HEAD(shd_list);static DEFINE_MUTEX(shd_mutex); /* Protects shd_list and shd->list */
/* This structure represents a shared devlink instance, * there is one created per identifier (e.g., serial number). */struct devlink_shd { struct list_head list; /* Node in shd list */ const char *id; /* Identifier string (e.g., serial number) */ refcount_t refcount; /* Reference count */ size_t priv_size; /* Size of driver private data */ char priv[] __aligned(NETDEV_ALIGN) __counted_by(priv_size);};
static struct devlink_shd *devlink_shd_lookup(const char *id){ struct devlink_shd *shd;
list_for_each_entry(shd, &shd_list, list) { if (!strcmp(shd->id, id)) return shd; }
return NULL;}
static struct devlink_shd *devlink_shd_create(const char *id, const struct devlink_ops *ops, size_t priv_size, const struct device_driver *driver){ struct devlink_shd *shd; struct devlink *devlink;
devlink = __devlink_alloc(ops, sizeof(struct devlink_shd) + priv_size, &init_net, NULL, driver); if (!devlink) return NULL; shd = devlink_priv(devlink);
shd->id = kstrdup(id, GFP_KERNEL); if (!shd->id) goto err_devlink_free; shd->priv_size = priv_size; refcount_set(&shd->refcount, 1);
devl_lock(devlink); devl_register(devlink); devl_unlock(devlink);
list_add_tail(&shd->list, &shd_list);
return shd;
err_devlink_free: devlink_free(devlink); return NULL;}
static void devlink_shd_destroy(struct devlink_shd *shd){ struct devlink *devlink = priv_to_devlink(shd);
list_del(&shd->list); devl_lock(devlink); devl_unregister(devlink); devl_unlock(devlink); kfree(shd->id); devlink_free(devlink);}
/** * devlink_shd_get - Get or create a shared devlink instance * @id: Identifier string (e.g., serial number) for the shared instance * @ops: Devlink operations structure * @priv_size: Size of private data structure * @driver: Driver associated with the shared devlink instance * * Get an existing shared devlink instance identified by @id, or create * a new one if it doesn't exist. Return the devlink instance with a * reference held. The caller must call devlink_shd_put() when done. * * All callers sharing the same @id must pass identical @ops, @priv_size * and @driver. A mismatch triggers a warning and returns NULL. * * Return: Pointer to the shared devlink instance on success, * NULL on failure */struct devlink *devlink_shd_get(const char *id, const struct devlink_ops *ops, size_t priv_size, const struct device_driver *driver){ struct devlink *devlink; struct devlink_shd *shd;
mutex_lock(&shd_mutex);
shd = devlink_shd_lookup(id); if (!shd) { shd = devlink_shd_create(id, ops, priv_size, driver); goto unlock; }
devlink = priv_to_devlink(shd); if (WARN_ON_ONCE(devlink->ops != ops || shd->priv_size != priv_size || devlink->dev_driver != driver)) { shd = NULL; goto unlock; } refcount_inc(&shd->refcount);
unlock: mutex_unlock(&shd_mutex); return shd ? priv_to_devlink(shd) : NULL;}EXPORT_SYMBOL_GPL(devlink_shd_get);
/** * devlink_shd_put - Release a reference on a shared devlink instance * @devlink: Shared devlink instance * * Release a reference on a shared devlink instance obtained via * devlink_shd_get(). */void devlink_shd_put(struct devlink *devlink){ struct devlink_shd *shd;
mutex_lock(&shd_mutex); shd = devlink_priv(devlink); if (refcount_dec_and_test(&shd->refcount)) devlink_shd_destroy(shd); mutex_unlock(&shd_mutex);}EXPORT_SYMBOL_GPL(devlink_shd_put);
/** * devlink_shd_get_priv - Get private data from shared devlink instance * @devlink: Devlink instance * * Returns a pointer to the driver's private data structure within * the shared devlink instance. * * Return: Pointer to private data */void *devlink_shd_get_priv(struct devlink *devlink){ struct devlink_shd *shd = devlink_priv(devlink);
return shd->priv;}EXPORT_SYMBOL_GPL(devlink_shd_get_priv);