1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 #ifndef _NET_CORE_DEV_H 3 #define _NET_CORE_DEV_H 4 5 #include <linux/cleanup.h> 6 #include <linux/types.h> 7 #include <linux/rwsem.h> 8 #include <linux/netdevice.h> 9 #include <net/netdev_lock.h> 10 11 struct net; 12 struct netlink_ext_ack; 13 struct cpumask; 14 15 /* Random bits of netdevice that don't need to be exposed */ 16 #define FLOW_LIMIT_HISTORY (1 << 7) /* must be ^2 and !overflow buckets */ 17 struct sd_flow_limit { 18 struct rcu_head rcu; 19 unsigned int count; 20 u8 log_buckets; 21 unsigned int history_head; 22 u16 history[FLOW_LIMIT_HISTORY]; 23 u8 buckets[]; 24 }; 25 26 extern int netdev_flow_limit_table_len; 27 28 struct napi_struct * 29 netdev_napi_by_id_lock(struct net *net, unsigned int napi_id); 30 struct net_device *dev_get_by_napi_id(unsigned int napi_id); 31 32 struct net_device *netdev_get_by_index_lock(struct net *net, int ifindex); 33 struct net_device *__netdev_put_lock(struct net_device *dev, struct net *net); 34 struct net_device * 35 netdev_xa_find_lock(struct net *net, struct net_device *dev, 36 unsigned long *index); 37 38 DEFINE_FREE(netdev_unlock, struct net_device *, if (_T) netdev_unlock(_T)); 39 40 #define for_each_netdev_lock_scoped(net, var_name, ifindex) \ 41 for (struct net_device *var_name __free(netdev_unlock) = NULL; \ 42 (var_name = netdev_xa_find_lock(net, var_name, &ifindex)); \ 43 ifindex++) 44 45 struct net_device * 46 netdev_get_by_index_lock_ops_compat(struct net *net, int ifindex); 47 struct net_device * 48 netdev_xa_find_lock_ops_compat(struct net *net, struct net_device *dev, 49 unsigned long *index); 50 51 DEFINE_FREE(netdev_unlock_ops_compat, struct net_device *, 52 if (_T) netdev_unlock_ops_compat(_T)); 53 54 #define for_each_netdev_lock_ops_compat_scoped(net, var_name, ifindex) \ 55 for (struct net_device *var_name __free(netdev_unlock_ops_compat) = NULL; \ 56 (var_name = netdev_xa_find_lock_ops_compat(net, var_name, \ 57 &ifindex)); \ 58 ifindex++) 59 60 #ifdef CONFIG_PROC_FS 61 int __init dev_proc_init(void); 62 #else 63 #define dev_proc_init() 0 64 #endif 65 66 void linkwatch_init_dev(struct net_device *dev); 67 void linkwatch_run_queue(void); 68 69 void dev_addr_flush(struct net_device *dev); 70 int dev_addr_init(struct net_device *dev); 71 void dev_addr_check(struct net_device *dev); 72 73 #if IS_ENABLED(CONFIG_NET_SHAPER) 74 void net_shaper_flush_netdev(struct net_device *dev); 75 void net_shaper_set_real_num_tx_queues(struct net_device *dev, 76 unsigned int txq); 77 #else 78 static inline void net_shaper_flush_netdev(struct net_device *dev) {} 79 static inline void net_shaper_set_real_num_tx_queues(struct net_device *dev, 80 unsigned int txq) {} 81 #endif 82 83 /* sysctls not referred to from outside net/core/ */ 84 extern int netdev_unregister_timeout_secs; 85 extern int weight_p; 86 extern int dev_weight_rx_bias; 87 extern int dev_weight_tx_bias; 88 89 extern struct rw_semaphore dev_addr_sem; 90 91 /* rtnl helpers */ 92 extern struct list_head net_todo_list; 93 void netdev_run_todo(void); 94 95 /* netdev management, shared between various uAPI entry points */ 96 struct netdev_name_node { 97 struct hlist_node hlist; 98 struct list_head list; 99 struct net_device *dev; 100 const char *name; 101 struct rcu_head rcu; 102 }; 103 104 int netdev_get_name(struct net *net, char *name, int ifindex); 105 int netif_change_name(struct net_device *dev, const char *newname); 106 int dev_change_name(struct net_device *dev, const char *newname); 107 108 #define netdev_for_each_altname(dev, namenode) \ 109 list_for_each_entry((namenode), &(dev)->name_node->list, list) 110 #define netdev_for_each_altname_safe(dev, namenode, next) \ 111 list_for_each_entry_safe((namenode), (next), &(dev)->name_node->list, \ 112 list) 113 114 int netdev_name_node_alt_create(struct net_device *dev, const char *name); 115 int netdev_name_node_alt_destroy(struct net_device *dev, const char *name); 116 117 int dev_validate_mtu(struct net_device *dev, int mtu, 118 struct netlink_ext_ack *extack); 119 int netif_set_mtu_ext(struct net_device *dev, int new_mtu, 120 struct netlink_ext_ack *extack); 121 122 int dev_get_phys_port_id(struct net_device *dev, 123 struct netdev_phys_item_id *ppid); 124 int dev_get_phys_port_name(struct net_device *dev, 125 char *name, size_t len); 126 127 int netif_change_proto_down(struct net_device *dev, bool proto_down); 128 int dev_change_proto_down(struct net_device *dev, bool proto_down); 129 void netdev_change_proto_down_reason_locked(struct net_device *dev, 130 unsigned long mask, u32 value); 131 132 typedef int (*bpf_op_t)(struct net_device *dev, struct netdev_bpf *bpf); 133 int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack, 134 int fd, int expected_fd, u32 flags); 135 136 int netif_change_tx_queue_len(struct net_device *dev, unsigned long new_len); 137 int dev_change_tx_queue_len(struct net_device *dev, unsigned long new_len); 138 void netif_set_group(struct net_device *dev, int new_group); 139 void dev_set_group(struct net_device *dev, int new_group); 140 int netif_change_carrier(struct net_device *dev, bool new_carrier); 141 int dev_change_carrier(struct net_device *dev, bool new_carrier); 142 143 void __dev_set_rx_mode(struct net_device *dev); 144 145 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags, 146 unsigned int gchanges, u32 portid, 147 const struct nlmsghdr *nlh); 148 149 void unregister_netdevice_many_notify(struct list_head *head, 150 u32 portid, const struct nlmsghdr *nlh); 151 152 static inline void netif_set_up(struct net_device *dev, bool value) 153 { 154 if (value) 155 dev->flags |= IFF_UP; 156 else 157 dev->flags &= ~IFF_UP; 158 159 if (!netdev_need_ops_lock(dev)) 160 netdev_lock(dev); 161 dev->up = value; 162 if (!netdev_need_ops_lock(dev)) 163 netdev_unlock(dev); 164 } 165 166 static inline void netif_set_gso_max_size(struct net_device *dev, 167 unsigned int size) 168 { 169 /* dev->gso_max_size is read locklessly from sk_setup_caps() */ 170 WRITE_ONCE(dev->gso_max_size, size); 171 if (size <= GSO_LEGACY_MAX_SIZE) 172 WRITE_ONCE(dev->gso_ipv4_max_size, size); 173 } 174 175 static inline void netif_set_gso_max_segs(struct net_device *dev, 176 unsigned int segs) 177 { 178 /* dev->gso_max_segs is read locklessly from sk_setup_caps() */ 179 WRITE_ONCE(dev->gso_max_segs, segs); 180 } 181 182 static inline void netif_set_gro_max_size(struct net_device *dev, 183 unsigned int size) 184 { 185 /* This pairs with the READ_ONCE() in skb_gro_receive() */ 186 WRITE_ONCE(dev->gro_max_size, size); 187 if (size <= GRO_LEGACY_MAX_SIZE) 188 WRITE_ONCE(dev->gro_ipv4_max_size, size); 189 } 190 191 static inline void netif_set_gso_ipv4_max_size(struct net_device *dev, 192 unsigned int size) 193 { 194 /* dev->gso_ipv4_max_size is read locklessly from sk_setup_caps() */ 195 WRITE_ONCE(dev->gso_ipv4_max_size, size); 196 } 197 198 static inline void netif_set_gro_ipv4_max_size(struct net_device *dev, 199 unsigned int size) 200 { 201 /* This pairs with the READ_ONCE() in skb_gro_receive() */ 202 WRITE_ONCE(dev->gro_ipv4_max_size, size); 203 } 204 205 /** 206 * napi_get_defer_hard_irqs - get the NAPI's defer_hard_irqs 207 * @n: napi struct to get the defer_hard_irqs field from 208 * 209 * Return: the per-NAPI value of the defar_hard_irqs field. 210 */ 211 static inline u32 napi_get_defer_hard_irqs(const struct napi_struct *n) 212 { 213 return READ_ONCE(n->defer_hard_irqs); 214 } 215 216 /** 217 * napi_set_defer_hard_irqs - set the defer_hard_irqs for a napi 218 * @n: napi_struct to set the defer_hard_irqs field 219 * @defer: the value the field should be set to 220 */ 221 static inline void napi_set_defer_hard_irqs(struct napi_struct *n, u32 defer) 222 { 223 WRITE_ONCE(n->defer_hard_irqs, defer); 224 } 225 226 /** 227 * netdev_set_defer_hard_irqs - set defer_hard_irqs for all NAPIs of a netdev 228 * @netdev: the net_device for which all NAPIs will have defer_hard_irqs set 229 * @defer: the defer_hard_irqs value to set 230 */ 231 static inline void netdev_set_defer_hard_irqs(struct net_device *netdev, 232 u32 defer) 233 { 234 unsigned int count = max(netdev->num_rx_queues, 235 netdev->num_tx_queues); 236 struct napi_struct *napi; 237 int i; 238 239 WRITE_ONCE(netdev->napi_defer_hard_irqs, defer); 240 list_for_each_entry(napi, &netdev->napi_list, dev_list) 241 napi_set_defer_hard_irqs(napi, defer); 242 243 for (i = 0; i < count; i++) 244 netdev->napi_config[i].defer_hard_irqs = defer; 245 } 246 247 /** 248 * napi_get_gro_flush_timeout - get the gro_flush_timeout 249 * @n: napi struct to get the gro_flush_timeout from 250 * 251 * Return: the per-NAPI value of the gro_flush_timeout field. 252 */ 253 static inline unsigned long 254 napi_get_gro_flush_timeout(const struct napi_struct *n) 255 { 256 return READ_ONCE(n->gro_flush_timeout); 257 } 258 259 /** 260 * napi_set_gro_flush_timeout - set the gro_flush_timeout for a napi 261 * @n: napi struct to set the gro_flush_timeout 262 * @timeout: timeout value to set 263 * 264 * napi_set_gro_flush_timeout sets the per-NAPI gro_flush_timeout 265 */ 266 static inline void napi_set_gro_flush_timeout(struct napi_struct *n, 267 unsigned long timeout) 268 { 269 WRITE_ONCE(n->gro_flush_timeout, timeout); 270 } 271 272 /** 273 * netdev_set_gro_flush_timeout - set gro_flush_timeout of a netdev's NAPIs 274 * @netdev: the net_device for which all NAPIs will have gro_flush_timeout set 275 * @timeout: the timeout value to set 276 */ 277 static inline void netdev_set_gro_flush_timeout(struct net_device *netdev, 278 unsigned long timeout) 279 { 280 unsigned int count = max(netdev->num_rx_queues, 281 netdev->num_tx_queues); 282 struct napi_struct *napi; 283 int i; 284 285 WRITE_ONCE(netdev->gro_flush_timeout, timeout); 286 list_for_each_entry(napi, &netdev->napi_list, dev_list) 287 napi_set_gro_flush_timeout(napi, timeout); 288 289 for (i = 0; i < count; i++) 290 netdev->napi_config[i].gro_flush_timeout = timeout; 291 } 292 293 /** 294 * napi_get_irq_suspend_timeout - get the irq_suspend_timeout 295 * @n: napi struct to get the irq_suspend_timeout from 296 * 297 * Return: the per-NAPI value of the irq_suspend_timeout field. 298 */ 299 static inline unsigned long 300 napi_get_irq_suspend_timeout(const struct napi_struct *n) 301 { 302 return READ_ONCE(n->irq_suspend_timeout); 303 } 304 305 /** 306 * napi_set_irq_suspend_timeout - set the irq_suspend_timeout for a napi 307 * @n: napi struct to set the irq_suspend_timeout 308 * @timeout: timeout value to set 309 * 310 * napi_set_irq_suspend_timeout sets the per-NAPI irq_suspend_timeout 311 */ 312 static inline void napi_set_irq_suspend_timeout(struct napi_struct *n, 313 unsigned long timeout) 314 { 315 WRITE_ONCE(n->irq_suspend_timeout, timeout); 316 } 317 318 static inline enum netdev_napi_threaded napi_get_threaded(struct napi_struct *n) 319 { 320 if (test_bit(NAPI_STATE_THREADED, &n->state)) 321 return NETDEV_NAPI_THREADED_ENABLED; 322 323 return NETDEV_NAPI_THREADED_DISABLED; 324 } 325 326 static inline enum netdev_napi_threaded 327 napi_get_threaded_config(struct net_device *dev, struct napi_struct *n) 328 { 329 if (n->config) 330 return n->config->threaded; 331 return dev->threaded; 332 } 333 334 int napi_set_threaded(struct napi_struct *n, 335 enum netdev_napi_threaded threaded); 336 337 int netif_set_threaded(struct net_device *dev, 338 enum netdev_napi_threaded threaded); 339 340 int rps_cpumask_housekeeping(struct cpumask *mask); 341 342 #if defined(CONFIG_DEBUG_NET) && defined(CONFIG_BPF_SYSCALL) 343 void xdp_do_check_flushed(struct napi_struct *napi); 344 #else 345 static inline void xdp_do_check_flushed(struct napi_struct *napi) { } 346 #endif 347 348 /* Best effort check that NAPI is not idle (can't be scheduled to run) */ 349 static inline void napi_assert_will_not_race(const struct napi_struct *napi) 350 { 351 /* uninitialized instance, can't race */ 352 if (!napi->poll_list.next) 353 return; 354 355 /* SCHED bit is set on disabled instances */ 356 WARN_ON(!test_bit(NAPI_STATE_SCHED, &napi->state)); 357 WARN_ON(READ_ONCE(napi->list_owner) != -1); 358 } 359 360 void kick_defer_list_purge(struct softnet_data *sd, unsigned int cpu); 361 362 #define XMIT_RECURSION_LIMIT 8 363 364 #ifndef CONFIG_PREEMPT_RT 365 static inline bool dev_xmit_recursion(void) 366 { 367 return unlikely(__this_cpu_read(softnet_data.xmit.recursion) > 368 XMIT_RECURSION_LIMIT); 369 } 370 371 static inline void dev_xmit_recursion_inc(void) 372 { 373 __this_cpu_inc(softnet_data.xmit.recursion); 374 } 375 376 static inline void dev_xmit_recursion_dec(void) 377 { 378 __this_cpu_dec(softnet_data.xmit.recursion); 379 } 380 #else 381 static inline bool dev_xmit_recursion(void) 382 { 383 return unlikely(current->net_xmit.recursion > XMIT_RECURSION_LIMIT); 384 } 385 386 static inline void dev_xmit_recursion_inc(void) 387 { 388 current->net_xmit.recursion++; 389 } 390 391 static inline void dev_xmit_recursion_dec(void) 392 { 393 current->net_xmit.recursion--; 394 } 395 #endif 396 397 int dev_set_hwtstamp_phylib(struct net_device *dev, 398 struct kernel_hwtstamp_config *cfg, 399 struct netlink_ext_ack *extack); 400 int dev_get_hwtstamp_phylib(struct net_device *dev, 401 struct kernel_hwtstamp_config *cfg); 402 int net_hwtstamp_validate(const struct kernel_hwtstamp_config *cfg); 403 404 #endif 405