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