Quelle netdev_lock.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0-or-later */

#ifndef _NET_NETDEV_LOCK_H
#define _NET_NETDEV_LOCK_H

#include <linux/lockdep.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>

static inline bool netdev_trylock(struct net_device *dev)
{
return mutex_trylock(&dev->lock);
}

static inline void netdev_assert_locked(const struct net_device *dev)
{
lockdep_assert_held(&dev->lock);
}

static inline void
netdev_assert_locked_or_invisible(const struct net_device *dev)
{
if (dev->reg_state == NETREG_REGISTERED ||
     dev->reg_state == NETREG_UNREGISTERING)
  netdev_assert_locked(dev);
}

static inline bool netdev_need_ops_lock(const struct net_device *dev)
{
bool ret = dev->request_ops_lock || !!dev->queue_mgmt_ops;

#if IS_ENABLED(CONFIG_NET_SHAPER)
ret |= !!dev->netdev_ops->net_shaper_ops;
#endif

return ret;
}

static inline void netdev_lock_ops(struct net_device *dev)
{
if (netdev_need_ops_lock(dev))
  netdev_lock(dev);
}

static inline void netdev_unlock_ops(struct net_device *dev)
{
if (netdev_need_ops_lock(dev))
  netdev_unlock(dev);
}

static inline void netdev_lock_ops_to_full(struct net_device *dev)
{
if (netdev_need_ops_lock(dev))
  netdev_assert_locked(dev);
else
  netdev_lock(dev);
}

static inline void netdev_unlock_full_to_ops(struct net_device *dev)
{
if (netdev_need_ops_lock(dev))
  netdev_assert_locked(dev);
else
  netdev_unlock(dev);
}

static inline void netdev_ops_assert_locked(const struct net_device *dev)
{
if (netdev_need_ops_lock(dev))
  lockdep_assert_held(&dev->lock);
else
  ASSERT_RTNL();
}

static inline void
netdev_ops_assert_locked_or_invisible(const struct net_device *dev)
{
if (dev->reg_state == NETREG_REGISTERED ||
     dev->reg_state == NETREG_UNREGISTERING)
  netdev_ops_assert_locked(dev);
}

static inline void netdev_lock_ops_compat(struct net_device *dev)
{
if (netdev_need_ops_lock(dev))
  netdev_lock(dev);
else
  rtnl_lock();
}

static inline void netdev_unlock_ops_compat(struct net_device *dev)
{
if (netdev_need_ops_lock(dev))
  netdev_unlock(dev);
else
  rtnl_unlock();
}

static inline int netdev_lock_cmp_fn(const struct lockdep_map *a,
         const struct lockdep_map *b)
{
if (a == b)
  return 0;

/* Allow locking multiple devices only under rtnl_lock,
* the exact order doesn't matter.
* Note that upper devices don't lock their ops, so nesting
* mostly happens in batched device removal for now.
*/
return lockdep_rtnl_is_held() ? -1 : 1;
}

#define netdev_lockdep_set_classes(dev)    \
{        \
static struct lock_class_key qdisc_tx_busylock_key; \
static struct lock_class_key qdisc_xmit_lock_key; \
static struct lock_class_key dev_addr_list_lock_key; \
static struct lock_class_key dev_instance_lock_key; \
unsigned int i;      \
        \
(dev)->qdisc_tx_busylock = &qdisc_tx_busylock_key; \
lockdep_set_class(&(dev)->addr_list_lock,  \
     &dev_addr_list_lock_key);  \
lockdep_set_class(&(dev)->lock,    \
     &dev_instance_lock_key);  \
lock_set_cmp_fn(&dev->lock, netdev_lock_cmp_fn, NULL); \
for (i = 0; i < (dev)->num_tx_queues; i++)  \
  lockdep_set_class(&(dev)->_tx[i]._xmit_lock, \
      &qdisc_xmit_lock_key); \
}

#define netdev_lock_dereference(p, dev)    \
rcu_dereference_protected(p, lockdep_is_held(&(dev)->lock))

int netdev_debug_event(struct notifier_block *nb, unsigned long event,
         void *ptr);

#endif

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