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