1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 3 #ifndef _NET_NETDEV_LOCK_H 4 #define _NET_NETDEV_LOCK_H 5 6 #include <linux/lockdep.h> 7 #include <linux/netdevice.h> 8 9 static inline bool netdev_trylock(struct net_device *dev) 10 { 11 return mutex_trylock(&dev->lock); 12 } 13 14 static inline void netdev_assert_locked(const struct net_device *dev) 15 { 16 lockdep_assert_held(&dev->lock); 17 } 18 19 static inline void 20 netdev_assert_locked_or_invisible(const struct net_device *dev) 21 { 22 if (dev->reg_state == NETREG_REGISTERED || 23 dev->reg_state == NETREG_UNREGISTERING) 24 netdev_assert_locked(dev); 25 } 26 27 static inline bool netdev_need_ops_lock(const struct net_device *dev) 28 { 29 bool ret = dev->request_ops_lock || !!dev->queue_mgmt_ops; 30 31 #if IS_ENABLED(CONFIG_NET_SHAPER) 32 ret |= !!dev->netdev_ops->net_shaper_ops; 33 #endif 34 35 return ret; 36 } 37 38 static inline void netdev_lock_ops(struct net_device *dev) 39 { 40 if (netdev_need_ops_lock(dev)) 41 netdev_lock(dev); 42 } 43 44 static inline void netdev_unlock_ops(struct net_device *dev) 45 { 46 if (netdev_need_ops_lock(dev)) 47 netdev_unlock(dev); 48 } 49 50 static inline void netdev_ops_assert_locked(const struct net_device *dev) 51 { 52 if (netdev_need_ops_lock(dev)) 53 lockdep_assert_held(&dev->lock); 54 } 55 56 static inline int netdev_lock_cmp_fn(const struct lockdep_map *a, 57 const struct lockdep_map *b) 58 { 59 /* Only lower devices currently grab the instance lock, so no 60 * real ordering issues can occur. In the near future, only 61 * hardware devices will grab instance lock which also does not 62 * involve any ordering. Suppress lockdep ordering warnings 63 * until (if) we start grabbing instance lock on pure SW 64 * devices (bond/team/veth/etc). 65 */ 66 if (a == b) 67 return 0; 68 return -1; 69 } 70 71 #define netdev_lockdep_set_classes(dev) \ 72 { \ 73 static struct lock_class_key qdisc_tx_busylock_key; \ 74 static struct lock_class_key qdisc_xmit_lock_key; \ 75 static struct lock_class_key dev_addr_list_lock_key; \ 76 static struct lock_class_key dev_instance_lock_key; \ 77 unsigned int i; \ 78 \ 79 (dev)->qdisc_tx_busylock = &qdisc_tx_busylock_key; \ 80 lockdep_set_class(&(dev)->addr_list_lock, \ 81 &dev_addr_list_lock_key); \ 82 lockdep_set_class(&(dev)->lock, \ 83 &dev_instance_lock_key); \ 84 lock_set_cmp_fn(&dev->lock, netdev_lock_cmp_fn, NULL); \ 85 for (i = 0; i < (dev)->num_tx_queues; i++) \ 86 lockdep_set_class(&(dev)->_tx[i]._xmit_lock, \ 87 &qdisc_xmit_lock_key); \ 88 } 89 90 #endif 91