1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * Definitions for the Interfaces handler. 8 * 9 * Version: @(#)dev.h 1.0.10 08/12/93 10 * 11 * Authors: Ross Biro 12 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 13 * Corey Minyard <wf-rch!minyard@relay.EU.net> 14 * Donald J. Becker, <becker@cesdis.gsfc.nasa.gov> 15 * Alan Cox, <alan@lxorguk.ukuu.org.uk> 16 * Bjorn Ekwall. <bj0rn@blox.se> 17 * Pekka Riikonen <priikone@poseidon.pspt.fi> 18 * 19 * Moved to /usr/include/linux for NET3 20 */ 21 #ifndef _LINUX_NETDEVICE_H 22 #define _LINUX_NETDEVICE_H 23 24 #include <linux/timer.h> 25 #include <linux/bug.h> 26 #include <linux/delay.h> 27 #include <linux/atomic.h> 28 #include <linux/prefetch.h> 29 #include <asm/cache.h> 30 #include <asm/byteorder.h> 31 #include <asm/local.h> 32 33 #include <linux/percpu.h> 34 #include <linux/rculist.h> 35 #include <linux/workqueue.h> 36 #include <linux/dynamic_queue_limits.h> 37 38 #include <net/net_namespace.h> 39 #ifdef CONFIG_DCB 40 #include <net/dcbnl.h> 41 #endif 42 #include <net/netprio_cgroup.h> 43 #include <linux/netdev_features.h> 44 #include <linux/neighbour.h> 45 #include <linux/netdevice_xmit.h> 46 #include <uapi/linux/netdevice.h> 47 #include <uapi/linux/if_bonding.h> 48 #include <uapi/linux/pkt_cls.h> 49 #include <uapi/linux/netdev.h> 50 #include <linux/hashtable.h> 51 #include <linux/rbtree.h> 52 #include <net/net_trackers.h> 53 #include <net/net_debug.h> 54 #include <net/dropreason-core.h> 55 #include <net/neighbour_tables.h> 56 57 struct netpoll_info; 58 struct device; 59 struct ethtool_ops; 60 struct kernel_hwtstamp_config; 61 struct phy_device; 62 struct dsa_port; 63 struct ip_tunnel_parm_kern; 64 struct macsec_context; 65 struct macsec_ops; 66 struct netdev_config; 67 struct netdev_name_node; 68 struct sd_flow_limit; 69 struct sfp_bus; 70 /* 802.11 specific */ 71 struct wireless_dev; 72 /* 802.15.4 specific */ 73 struct wpan_dev; 74 struct mpls_dev; 75 /* UDP Tunnel offloads */ 76 struct udp_tunnel_info; 77 struct udp_tunnel_nic_info; 78 struct udp_tunnel_nic; 79 struct bpf_prog; 80 struct xdp_buff; 81 struct xdp_frame; 82 struct xdp_metadata_ops; 83 struct xdp_md; 84 struct ethtool_netdev_state; 85 struct phy_link_topology; 86 struct hwtstamp_provider; 87 88 typedef u32 xdp_features_t; 89 90 void synchronize_net(void); 91 void netdev_set_default_ethtool_ops(struct net_device *dev, 92 const struct ethtool_ops *ops); 93 void netdev_sw_irq_coalesce_default_on(struct net_device *dev); 94 95 /* Backlog congestion levels */ 96 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */ 97 #define NET_RX_DROP 1 /* packet dropped */ 98 99 #define MAX_NEST_DEV 8 100 101 /* 102 * Transmit return codes: transmit return codes originate from three different 103 * namespaces: 104 * 105 * - qdisc return codes 106 * - driver transmit return codes 107 * - errno values 108 * 109 * Drivers are allowed to return any one of those in their hard_start_xmit() 110 * function. Real network devices commonly used with qdiscs should only return 111 * the driver transmit return codes though - when qdiscs are used, the actual 112 * transmission happens asynchronously, so the value is not propagated to 113 * higher layers. Virtual network devices transmit synchronously; in this case 114 * the driver transmit return codes are consumed by dev_queue_xmit(), and all 115 * others are propagated to higher layers. 116 */ 117 118 /* qdisc ->enqueue() return codes. */ 119 #define NET_XMIT_SUCCESS 0x00 120 #define NET_XMIT_DROP 0x01 /* skb dropped */ 121 #define NET_XMIT_CN 0x02 /* congestion notification */ 122 #define NET_XMIT_MASK 0x0f /* qdisc flags in net/sch_generic.h */ 123 124 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It 125 * indicates that the device will soon be dropping packets, or already drops 126 * some packets of the same priority; prompting us to send less aggressively. */ 127 #define net_xmit_eval(e) ((e) == NET_XMIT_CN ? 0 : (e)) 128 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0) 129 130 /* Driver transmit return codes */ 131 #define NETDEV_TX_MASK 0xf0 132 133 enum netdev_tx { 134 __NETDEV_TX_MIN = INT_MIN, /* make sure enum is signed */ 135 NETDEV_TX_OK = 0x00, /* driver took care of packet */ 136 NETDEV_TX_BUSY = 0x10, /* driver tx path was busy*/ 137 }; 138 typedef enum netdev_tx netdev_tx_t; 139 140 /* 141 * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant; 142 * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed. 143 */ 144 static inline bool dev_xmit_complete(int rc) 145 { 146 /* 147 * Positive cases with an skb consumed by a driver: 148 * - successful transmission (rc == NETDEV_TX_OK) 149 * - error while transmitting (rc < 0) 150 * - error while queueing to a different device (rc & NET_XMIT_MASK) 151 */ 152 if (likely(rc < NET_XMIT_MASK)) 153 return true; 154 155 return false; 156 } 157 158 /* 159 * Compute the worst-case header length according to the protocols 160 * used. 161 */ 162 163 #if defined(CONFIG_HYPERV_NET) 164 # define LL_MAX_HEADER 128 165 #elif defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25) 166 # if defined(CONFIG_MAC80211_MESH) 167 # define LL_MAX_HEADER 128 168 # else 169 # define LL_MAX_HEADER 96 170 # endif 171 #else 172 # define LL_MAX_HEADER 32 173 #endif 174 175 #if !IS_ENABLED(CONFIG_NET_IPIP) && !IS_ENABLED(CONFIG_NET_IPGRE) && \ 176 !IS_ENABLED(CONFIG_IPV6_SIT) && !IS_ENABLED(CONFIG_IPV6_TUNNEL) 177 #define MAX_HEADER LL_MAX_HEADER 178 #else 179 #define MAX_HEADER (LL_MAX_HEADER + 48) 180 #endif 181 182 /* 183 * Old network device statistics. Fields are native words 184 * (unsigned long) so they can be read and written atomically. 185 */ 186 187 #define NET_DEV_STAT(FIELD) \ 188 union { \ 189 unsigned long FIELD; \ 190 atomic_long_t __##FIELD; \ 191 } 192 193 struct net_device_stats { 194 NET_DEV_STAT(rx_packets); 195 NET_DEV_STAT(tx_packets); 196 NET_DEV_STAT(rx_bytes); 197 NET_DEV_STAT(tx_bytes); 198 NET_DEV_STAT(rx_errors); 199 NET_DEV_STAT(tx_errors); 200 NET_DEV_STAT(rx_dropped); 201 NET_DEV_STAT(tx_dropped); 202 NET_DEV_STAT(multicast); 203 NET_DEV_STAT(collisions); 204 NET_DEV_STAT(rx_length_errors); 205 NET_DEV_STAT(rx_over_errors); 206 NET_DEV_STAT(rx_crc_errors); 207 NET_DEV_STAT(rx_frame_errors); 208 NET_DEV_STAT(rx_fifo_errors); 209 NET_DEV_STAT(rx_missed_errors); 210 NET_DEV_STAT(tx_aborted_errors); 211 NET_DEV_STAT(tx_carrier_errors); 212 NET_DEV_STAT(tx_fifo_errors); 213 NET_DEV_STAT(tx_heartbeat_errors); 214 NET_DEV_STAT(tx_window_errors); 215 NET_DEV_STAT(rx_compressed); 216 NET_DEV_STAT(tx_compressed); 217 }; 218 #undef NET_DEV_STAT 219 220 /* per-cpu stats, allocated on demand. 221 * Try to fit them in a single cache line, for dev_get_stats() sake. 222 */ 223 struct net_device_core_stats { 224 unsigned long rx_dropped; 225 unsigned long tx_dropped; 226 unsigned long rx_nohandler; 227 unsigned long rx_otherhost_dropped; 228 } __aligned(4 * sizeof(unsigned long)); 229 230 #include <linux/cache.h> 231 #include <linux/skbuff.h> 232 233 struct neighbour; 234 struct neigh_parms; 235 struct sk_buff; 236 237 struct netdev_hw_addr { 238 struct list_head list; 239 struct rb_node node; 240 unsigned char addr[MAX_ADDR_LEN]; 241 unsigned char type; 242 #define NETDEV_HW_ADDR_T_LAN 1 243 #define NETDEV_HW_ADDR_T_SAN 2 244 #define NETDEV_HW_ADDR_T_UNICAST 3 245 #define NETDEV_HW_ADDR_T_MULTICAST 4 246 bool global_use; 247 int sync_cnt; 248 int refcount; 249 int synced; 250 struct rcu_head rcu_head; 251 }; 252 253 struct netdev_hw_addr_list { 254 struct list_head list; 255 int count; 256 257 /* Auxiliary tree for faster lookup on addition and deletion */ 258 struct rb_root tree; 259 }; 260 261 #define netdev_hw_addr_list_count(l) ((l)->count) 262 #define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0) 263 #define netdev_hw_addr_list_for_each(ha, l) \ 264 list_for_each_entry(ha, &(l)->list, list) 265 266 #define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc) 267 #define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc) 268 #define netdev_for_each_uc_addr(ha, dev) \ 269 netdev_hw_addr_list_for_each(ha, &(dev)->uc) 270 #define netdev_for_each_synced_uc_addr(_ha, _dev) \ 271 netdev_for_each_uc_addr((_ha), (_dev)) \ 272 if ((_ha)->sync_cnt) 273 274 #define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc) 275 #define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc) 276 #define netdev_for_each_mc_addr(ha, dev) \ 277 netdev_hw_addr_list_for_each(ha, &(dev)->mc) 278 #define netdev_for_each_synced_mc_addr(_ha, _dev) \ 279 netdev_for_each_mc_addr((_ha), (_dev)) \ 280 if ((_ha)->sync_cnt) 281 282 struct hh_cache { 283 unsigned int hh_len; 284 seqlock_t hh_lock; 285 286 /* cached hardware header; allow for machine alignment needs. */ 287 #define HH_DATA_MOD 16 288 #define HH_DATA_OFF(__len) \ 289 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) 290 #define HH_DATA_ALIGN(__len) \ 291 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) 292 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; 293 }; 294 295 /* Reserve HH_DATA_MOD byte-aligned hard_header_len, but at least that much. 296 * Alternative is: 297 * dev->hard_header_len ? (dev->hard_header_len + 298 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 299 * 300 * We could use other alignment values, but we must maintain the 301 * relationship HH alignment <= LL alignment. 302 */ 303 #define LL_RESERVED_SPACE(dev) \ 304 ((((dev)->hard_header_len + READ_ONCE((dev)->needed_headroom)) \ 305 & ~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 306 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 307 ((((dev)->hard_header_len + READ_ONCE((dev)->needed_headroom) + (extra)) \ 308 & ~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 309 310 struct header_ops { 311 int (*create) (struct sk_buff *skb, struct net_device *dev, 312 unsigned short type, const void *daddr, 313 const void *saddr, unsigned int len); 314 int (*parse)(const struct sk_buff *skb, 315 const struct net_device *dev, 316 unsigned char *haddr); 317 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh, __be16 type); 318 void (*cache_update)(struct hh_cache *hh, 319 const struct net_device *dev, 320 const unsigned char *haddr); 321 bool (*validate)(const char *ll_header, unsigned int len); 322 __be16 (*parse_protocol)(const struct sk_buff *skb); 323 }; 324 325 /* These flag bits are private to the generic network queueing 326 * layer; they may not be explicitly referenced by any other 327 * code. 328 */ 329 330 enum netdev_state_t { 331 __LINK_STATE_START, 332 __LINK_STATE_PRESENT, 333 __LINK_STATE_NOCARRIER, 334 __LINK_STATE_LINKWATCH_PENDING, 335 __LINK_STATE_DORMANT, 336 __LINK_STATE_TESTING, 337 }; 338 339 struct gro_list { 340 struct list_head list; 341 int count; 342 }; 343 344 /* 345 * size of gro hash buckets, must be <= the number of bits in 346 * gro_node::bitmask 347 */ 348 #define GRO_HASH_BUCKETS 8 349 350 /** 351 * struct gro_node - structure to support Generic Receive Offload 352 * @bitmask: bitmask to indicate used buckets in @hash 353 * @hash: hashtable of pending aggregated skbs, separated by flows 354 * @rx_list: list of pending ``GRO_NORMAL`` skbs 355 * @rx_count: cached current length of @rx_list 356 * @cached_napi_id: napi_struct::napi_id cached for hotpath, 0 for standalone 357 */ 358 struct gro_node { 359 unsigned long bitmask; 360 struct gro_list hash[GRO_HASH_BUCKETS]; 361 struct list_head rx_list; 362 u32 rx_count; 363 u32 cached_napi_id; 364 }; 365 366 /* 367 * Structure for per-NAPI config 368 */ 369 struct napi_config { 370 u64 gro_flush_timeout; 371 u64 irq_suspend_timeout; 372 u32 defer_hard_irqs; 373 cpumask_t affinity_mask; 374 u8 threaded; 375 unsigned int napi_id; 376 }; 377 378 /* 379 * Structure for NAPI scheduling similar to tasklet but with weighting 380 */ 381 struct napi_struct { 382 /* This field should be first or softnet_data.backlog needs tweaks. */ 383 unsigned long state; 384 /* The poll_list must only be managed by the entity which 385 * changes the state of the NAPI_STATE_SCHED bit. This means 386 * whoever atomically sets that bit can add this napi_struct 387 * to the per-CPU poll_list, and whoever clears that bit 388 * can remove from the list right before clearing the bit. 389 */ 390 struct list_head poll_list; 391 392 int weight; 393 u32 defer_hard_irqs_count; 394 int (*poll)(struct napi_struct *, int); 395 #ifdef CONFIG_NETPOLL 396 /* CPU actively polling if netpoll is configured */ 397 int poll_owner; 398 #endif 399 /* CPU on which NAPI has been scheduled for processing */ 400 int list_owner; 401 struct net_device *dev; 402 struct sk_buff *skb; 403 struct gro_node gro; 404 struct hrtimer timer; 405 /* all fields past this point are write-protected by netdev_lock */ 406 struct task_struct *thread; 407 unsigned long gro_flush_timeout; 408 unsigned long irq_suspend_timeout; 409 u32 defer_hard_irqs; 410 /* control-path-only fields follow */ 411 u32 napi_id; 412 struct list_head dev_list; 413 struct hlist_node napi_hash_node; 414 int irq; 415 struct irq_affinity_notify notify; 416 int napi_rmap_idx; 417 int index; 418 struct napi_config *config; 419 }; 420 421 enum { 422 NAPI_STATE_SCHED, /* Poll is scheduled */ 423 NAPI_STATE_MISSED, /* reschedule a napi */ 424 NAPI_STATE_DISABLE, /* Disable pending */ 425 NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */ 426 NAPI_STATE_LISTED, /* NAPI added to system lists */ 427 NAPI_STATE_NO_BUSY_POLL, /* Do not add in napi_hash, no busy polling */ 428 NAPI_STATE_IN_BUSY_POLL, /* Do not rearm NAPI interrupt */ 429 NAPI_STATE_PREFER_BUSY_POLL, /* prefer busy-polling over softirq processing*/ 430 NAPI_STATE_THREADED, /* The poll is performed inside its own thread*/ 431 NAPI_STATE_SCHED_THREADED, /* Napi is currently scheduled in threaded mode */ 432 NAPI_STATE_HAS_NOTIFIER, /* Napi has an IRQ notifier */ 433 NAPI_STATE_THREADED_BUSY_POLL, /* The threaded NAPI poller will busy poll */ 434 }; 435 436 enum { 437 NAPIF_STATE_SCHED = BIT(NAPI_STATE_SCHED), 438 NAPIF_STATE_MISSED = BIT(NAPI_STATE_MISSED), 439 NAPIF_STATE_DISABLE = BIT(NAPI_STATE_DISABLE), 440 NAPIF_STATE_NPSVC = BIT(NAPI_STATE_NPSVC), 441 NAPIF_STATE_LISTED = BIT(NAPI_STATE_LISTED), 442 NAPIF_STATE_NO_BUSY_POLL = BIT(NAPI_STATE_NO_BUSY_POLL), 443 NAPIF_STATE_IN_BUSY_POLL = BIT(NAPI_STATE_IN_BUSY_POLL), 444 NAPIF_STATE_PREFER_BUSY_POLL = BIT(NAPI_STATE_PREFER_BUSY_POLL), 445 NAPIF_STATE_THREADED = BIT(NAPI_STATE_THREADED), 446 NAPIF_STATE_SCHED_THREADED = BIT(NAPI_STATE_SCHED_THREADED), 447 NAPIF_STATE_HAS_NOTIFIER = BIT(NAPI_STATE_HAS_NOTIFIER), 448 NAPIF_STATE_THREADED_BUSY_POLL = BIT(NAPI_STATE_THREADED_BUSY_POLL), 449 }; 450 451 enum gro_result { 452 GRO_MERGED, 453 GRO_MERGED_FREE, 454 GRO_HELD, 455 GRO_NORMAL, 456 GRO_CONSUMED, 457 }; 458 typedef enum gro_result gro_result_t; 459 460 /* 461 * enum rx_handler_result - Possible return values for rx_handlers. 462 * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it 463 * further. 464 * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in 465 * case skb->dev was changed by rx_handler. 466 * @RX_HANDLER_EXACT: Force exact delivery, no wildcard. 467 * @RX_HANDLER_PASS: Do nothing, pass the skb as if no rx_handler was called. 468 * 469 * rx_handlers are functions called from inside __netif_receive_skb(), to do 470 * special processing of the skb, prior to delivery to protocol handlers. 471 * 472 * Currently, a net_device can only have a single rx_handler registered. Trying 473 * to register a second rx_handler will return -EBUSY. 474 * 475 * To register a rx_handler on a net_device, use netdev_rx_handler_register(). 476 * To unregister a rx_handler on a net_device, use 477 * netdev_rx_handler_unregister(). 478 * 479 * Upon return, rx_handler is expected to tell __netif_receive_skb() what to 480 * do with the skb. 481 * 482 * If the rx_handler consumed the skb in some way, it should return 483 * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for 484 * the skb to be delivered in some other way. 485 * 486 * If the rx_handler changed skb->dev, to divert the skb to another 487 * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the 488 * new device will be called if it exists. 489 * 490 * If the rx_handler decides the skb should be ignored, it should return 491 * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that 492 * are registered on exact device (ptype->dev == skb->dev). 493 * 494 * If the rx_handler didn't change skb->dev, but wants the skb to be normally 495 * delivered, it should return RX_HANDLER_PASS. 496 * 497 * A device without a registered rx_handler will behave as if rx_handler 498 * returned RX_HANDLER_PASS. 499 */ 500 501 enum rx_handler_result { 502 RX_HANDLER_CONSUMED, 503 RX_HANDLER_ANOTHER, 504 RX_HANDLER_EXACT, 505 RX_HANDLER_PASS, 506 }; 507 typedef enum rx_handler_result rx_handler_result_t; 508 typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb); 509 510 void __napi_schedule(struct napi_struct *n); 511 void __napi_schedule_irqoff(struct napi_struct *n); 512 513 static inline bool napi_disable_pending(struct napi_struct *n) 514 { 515 return test_bit(NAPI_STATE_DISABLE, &n->state); 516 } 517 518 static inline bool napi_prefer_busy_poll(struct napi_struct *n) 519 { 520 return test_bit(NAPI_STATE_PREFER_BUSY_POLL, &n->state); 521 } 522 523 /** 524 * napi_is_scheduled - test if NAPI is scheduled 525 * @n: NAPI context 526 * 527 * This check is "best-effort". With no locking implemented, 528 * a NAPI can be scheduled or terminate right after this check 529 * and produce not precise results. 530 * 531 * NAPI_STATE_SCHED is an internal state, napi_is_scheduled 532 * should not be used normally and napi_schedule should be 533 * used instead. 534 * 535 * Use only if the driver really needs to check if a NAPI 536 * is scheduled for example in the context of delayed timer 537 * that can be skipped if a NAPI is already scheduled. 538 * 539 * Return: True if NAPI is scheduled, False otherwise. 540 */ 541 static inline bool napi_is_scheduled(struct napi_struct *n) 542 { 543 return test_bit(NAPI_STATE_SCHED, &n->state); 544 } 545 546 bool napi_schedule_prep(struct napi_struct *n); 547 548 /** 549 * napi_schedule - schedule NAPI poll 550 * @n: NAPI context 551 * 552 * Schedule NAPI poll routine to be called if it is not already 553 * running. 554 * Return: true if we schedule a NAPI or false if not. 555 * Refer to napi_schedule_prep() for additional reason on why 556 * a NAPI might not be scheduled. 557 */ 558 static inline bool napi_schedule(struct napi_struct *n) 559 { 560 if (napi_schedule_prep(n)) { 561 __napi_schedule(n); 562 return true; 563 } 564 565 return false; 566 } 567 568 /** 569 * napi_schedule_irqoff - schedule NAPI poll 570 * @n: NAPI context 571 * 572 * Variant of napi_schedule(), assuming hard irqs are masked. 573 */ 574 static inline void napi_schedule_irqoff(struct napi_struct *n) 575 { 576 if (napi_schedule_prep(n)) 577 __napi_schedule_irqoff(n); 578 } 579 580 /** 581 * napi_complete_done - NAPI processing complete 582 * @n: NAPI context 583 * @work_done: number of packets processed 584 * 585 * Mark NAPI processing as complete. Should only be called if poll budget 586 * has not been completely consumed. 587 * Prefer over napi_complete(). 588 * Return: false if device should avoid rearming interrupts. 589 */ 590 bool napi_complete_done(struct napi_struct *n, int work_done); 591 592 static inline bool napi_complete(struct napi_struct *n) 593 { 594 return napi_complete_done(n, 0); 595 } 596 597 void netif_threaded_enable(struct net_device *dev); 598 int dev_set_threaded(struct net_device *dev, 599 enum netdev_napi_threaded threaded); 600 601 void napi_disable(struct napi_struct *n); 602 void napi_disable_locked(struct napi_struct *n); 603 604 void napi_enable(struct napi_struct *n); 605 void napi_enable_locked(struct napi_struct *n); 606 607 /** 608 * napi_synchronize - wait until NAPI is not running 609 * @n: NAPI context 610 * 611 * Wait until NAPI is done being scheduled on this context. 612 * Waits till any outstanding processing completes but 613 * does not disable future activations. 614 */ 615 static inline void napi_synchronize(const struct napi_struct *n) 616 { 617 if (IS_ENABLED(CONFIG_SMP)) 618 while (test_bit(NAPI_STATE_SCHED, &n->state)) 619 msleep(1); 620 else 621 barrier(); 622 } 623 624 /** 625 * napi_if_scheduled_mark_missed - if napi is running, set the 626 * NAPIF_STATE_MISSED 627 * @n: NAPI context 628 * 629 * If napi is running, set the NAPIF_STATE_MISSED, and return true if 630 * NAPI is scheduled. 631 **/ 632 static inline bool napi_if_scheduled_mark_missed(struct napi_struct *n) 633 { 634 unsigned long val, new; 635 636 val = READ_ONCE(n->state); 637 do { 638 if (val & NAPIF_STATE_DISABLE) 639 return true; 640 641 if (!(val & NAPIF_STATE_SCHED)) 642 return false; 643 644 new = val | NAPIF_STATE_MISSED; 645 } while (!try_cmpxchg(&n->state, &val, new)); 646 647 return true; 648 } 649 650 enum netdev_queue_state_t { 651 __QUEUE_STATE_DRV_XOFF, 652 __QUEUE_STATE_STACK_XOFF, 653 __QUEUE_STATE_FROZEN, 654 }; 655 656 #define QUEUE_STATE_DRV_XOFF (1 << __QUEUE_STATE_DRV_XOFF) 657 #define QUEUE_STATE_STACK_XOFF (1 << __QUEUE_STATE_STACK_XOFF) 658 #define QUEUE_STATE_FROZEN (1 << __QUEUE_STATE_FROZEN) 659 660 #define QUEUE_STATE_ANY_XOFF (QUEUE_STATE_DRV_XOFF | QUEUE_STATE_STACK_XOFF) 661 #define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF | \ 662 QUEUE_STATE_FROZEN) 663 #define QUEUE_STATE_DRV_XOFF_OR_FROZEN (QUEUE_STATE_DRV_XOFF | \ 664 QUEUE_STATE_FROZEN) 665 666 /* 667 * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue. The 668 * netif_tx_* functions below are used to manipulate this flag. The 669 * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit 670 * queue independently. The netif_xmit_*stopped functions below are called 671 * to check if the queue has been stopped by the driver or stack (either 672 * of the XOFF bits are set in the state). Drivers should not need to call 673 * netif_xmit*stopped functions, they should only be using netif_tx_*. 674 */ 675 676 struct netdev_queue { 677 /* 678 * read-mostly part 679 */ 680 struct net_device *dev; 681 netdevice_tracker dev_tracker; 682 683 struct Qdisc __rcu *qdisc; 684 struct Qdisc __rcu *qdisc_sleeping; 685 #ifdef CONFIG_SYSFS 686 struct kobject kobj; 687 const struct attribute_group **groups; 688 #endif 689 unsigned long tx_maxrate; 690 /* 691 * Number of TX timeouts for this queue 692 * (/sys/class/net/DEV/Q/trans_timeout) 693 */ 694 atomic_long_t trans_timeout; 695 696 /* Subordinate device that the queue has been assigned to */ 697 struct net_device *sb_dev; 698 #ifdef CONFIG_XDP_SOCKETS 699 /* "ops protected", see comment about net_device::lock */ 700 struct xsk_buff_pool *pool; 701 #endif 702 703 /* 704 * write-mostly part 705 */ 706 #ifdef CONFIG_BQL 707 struct dql dql; 708 #endif 709 spinlock_t _xmit_lock ____cacheline_aligned_in_smp; 710 int xmit_lock_owner; 711 /* 712 * Time (in jiffies) of last Tx 713 */ 714 unsigned long trans_start; 715 716 unsigned long state; 717 718 /* 719 * slow- / control-path part 720 */ 721 /* NAPI instance for the queue 722 * "ops protected", see comment about net_device::lock 723 */ 724 struct napi_struct *napi; 725 726 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA) 727 int numa_node; 728 #endif 729 } ____cacheline_aligned_in_smp; 730 731 extern int sysctl_fb_tunnels_only_for_init_net; 732 extern int sysctl_devconf_inherit_init_net; 733 734 /* 735 * sysctl_fb_tunnels_only_for_init_net == 0 : For all netns 736 * == 1 : For initns only 737 * == 2 : For none. 738 */ 739 static inline bool net_has_fallback_tunnels(const struct net *net) 740 { 741 #if IS_ENABLED(CONFIG_SYSCTL) 742 int fb_tunnels_only_for_init_net = READ_ONCE(sysctl_fb_tunnels_only_for_init_net); 743 744 return !fb_tunnels_only_for_init_net || 745 (net_eq(net, &init_net) && fb_tunnels_only_for_init_net == 1); 746 #else 747 return true; 748 #endif 749 } 750 751 static inline int net_inherit_devconf(void) 752 { 753 #if IS_ENABLED(CONFIG_SYSCTL) 754 return READ_ONCE(sysctl_devconf_inherit_init_net); 755 #else 756 return 0; 757 #endif 758 } 759 760 static inline int netdev_queue_numa_node_read(const struct netdev_queue *q) 761 { 762 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA) 763 return q->numa_node; 764 #else 765 return NUMA_NO_NODE; 766 #endif 767 } 768 769 static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node) 770 { 771 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA) 772 q->numa_node = node; 773 #endif 774 } 775 776 #ifdef CONFIG_RFS_ACCEL 777 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id, 778 u16 filter_id); 779 #endif 780 781 /* XPS map type and offset of the xps map within net_device->xps_maps[]. */ 782 enum xps_map_type { 783 XPS_CPUS = 0, 784 XPS_RXQS, 785 XPS_MAPS_MAX, 786 }; 787 788 #ifdef CONFIG_XPS 789 /* 790 * This structure holds an XPS map which can be of variable length. The 791 * map is an array of queues. 792 */ 793 struct xps_map { 794 unsigned int len; 795 unsigned int alloc_len; 796 struct rcu_head rcu; 797 u16 queues[]; 798 }; 799 #define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16))) 800 #define XPS_MIN_MAP_ALLOC ((L1_CACHE_ALIGN(offsetof(struct xps_map, queues[1])) \ 801 - sizeof(struct xps_map)) / sizeof(u16)) 802 803 /* 804 * This structure holds all XPS maps for device. Maps are indexed by CPU. 805 * 806 * We keep track of the number of cpus/rxqs used when the struct is allocated, 807 * in nr_ids. This will help not accessing out-of-bound memory. 808 * 809 * We keep track of the number of traffic classes used when the struct is 810 * allocated, in num_tc. This will be used to navigate the maps, to ensure we're 811 * not crossing its upper bound, as the original dev->num_tc can be updated in 812 * the meantime. 813 */ 814 struct xps_dev_maps { 815 struct rcu_head rcu; 816 unsigned int nr_ids; 817 s16 num_tc; 818 struct xps_map __rcu *attr_map[]; /* Either CPUs map or RXQs map */ 819 }; 820 821 #define XPS_CPU_DEV_MAPS_SIZE(_tcs) (sizeof(struct xps_dev_maps) + \ 822 (nr_cpu_ids * (_tcs) * sizeof(struct xps_map *))) 823 824 #define XPS_RXQ_DEV_MAPS_SIZE(_tcs, _rxqs) (sizeof(struct xps_dev_maps) +\ 825 (_rxqs * (_tcs) * sizeof(struct xps_map *))) 826 827 #endif /* CONFIG_XPS */ 828 829 #define TC_MAX_QUEUE 16 830 #define TC_BITMASK 15 831 /* HW offloaded queuing disciplines txq count and offset maps */ 832 struct netdev_tc_txq { 833 u16 count; 834 u16 offset; 835 }; 836 837 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 838 /* 839 * This structure is to hold information about the device 840 * configured to run FCoE protocol stack. 841 */ 842 struct netdev_fcoe_hbainfo { 843 char manufacturer[64]; 844 char serial_number[64]; 845 char hardware_version[64]; 846 char driver_version[64]; 847 char optionrom_version[64]; 848 char firmware_version[64]; 849 char model[256]; 850 char model_description[256]; 851 }; 852 #endif 853 854 #define MAX_PHYS_ITEM_ID_LEN 32 855 856 /* This structure holds a unique identifier to identify some 857 * physical item (port for example) used by a netdevice. 858 */ 859 struct netdev_phys_item_id { 860 unsigned char id[MAX_PHYS_ITEM_ID_LEN]; 861 unsigned char id_len; 862 }; 863 864 static inline bool netdev_phys_item_id_same(struct netdev_phys_item_id *a, 865 struct netdev_phys_item_id *b) 866 { 867 return a->id_len == b->id_len && 868 memcmp(a->id, b->id, a->id_len) == 0; 869 } 870 871 typedef u16 (*select_queue_fallback_t)(struct net_device *dev, 872 struct sk_buff *skb, 873 struct net_device *sb_dev); 874 875 enum net_device_path_type { 876 DEV_PATH_ETHERNET = 0, 877 DEV_PATH_VLAN, 878 DEV_PATH_BRIDGE, 879 DEV_PATH_PPPOE, 880 DEV_PATH_DSA, 881 DEV_PATH_MTK_WDMA, 882 DEV_PATH_TUN, 883 }; 884 885 struct net_device_path { 886 enum net_device_path_type type; 887 const struct net_device *dev; 888 union { 889 struct { 890 u16 id; 891 __be16 proto; 892 u8 h_dest[ETH_ALEN]; 893 } encap; 894 struct { 895 union { 896 struct in_addr src_v4; 897 struct in6_addr src_v6; 898 }; 899 union { 900 struct in_addr dst_v4; 901 struct in6_addr dst_v6; 902 }; 903 904 u8 l3_proto; 905 } tun; 906 struct { 907 enum { 908 DEV_PATH_BR_VLAN_KEEP, 909 DEV_PATH_BR_VLAN_TAG, 910 DEV_PATH_BR_VLAN_UNTAG, 911 DEV_PATH_BR_VLAN_UNTAG_HW, 912 } vlan_mode; 913 u16 vlan_id; 914 __be16 vlan_proto; 915 } bridge; 916 struct { 917 int port; 918 u16 proto; 919 } dsa; 920 struct { 921 u8 wdma_idx; 922 u8 queue; 923 u16 wcid; 924 u8 bss; 925 u8 amsdu; 926 } mtk_wdma; 927 }; 928 }; 929 930 #define NET_DEVICE_PATH_STACK_MAX 5 931 #define NET_DEVICE_PATH_VLAN_MAX 2 932 933 struct net_device_path_stack { 934 int num_paths; 935 struct net_device_path path[NET_DEVICE_PATH_STACK_MAX]; 936 }; 937 938 struct net_device_path_ctx { 939 const struct net_device *dev; 940 u8 daddr[ETH_ALEN]; 941 942 int num_vlans; 943 struct { 944 u16 id; 945 __be16 proto; 946 } vlan[NET_DEVICE_PATH_VLAN_MAX]; 947 }; 948 949 enum tc_setup_type { 950 TC_QUERY_CAPS, 951 TC_SETUP_QDISC_MQPRIO, 952 TC_SETUP_CLSU32, 953 TC_SETUP_CLSFLOWER, 954 TC_SETUP_CLSMATCHALL, 955 TC_SETUP_CLSBPF, 956 TC_SETUP_BLOCK, 957 TC_SETUP_QDISC_CBS, 958 TC_SETUP_QDISC_RED, 959 TC_SETUP_QDISC_PRIO, 960 TC_SETUP_QDISC_MQ, 961 TC_SETUP_QDISC_ETF, 962 TC_SETUP_ROOT_QDISC, 963 TC_SETUP_QDISC_GRED, 964 TC_SETUP_QDISC_TAPRIO, 965 TC_SETUP_FT, 966 TC_SETUP_QDISC_ETS, 967 TC_SETUP_QDISC_TBF, 968 TC_SETUP_QDISC_FIFO, 969 TC_SETUP_QDISC_HTB, 970 TC_SETUP_ACT, 971 }; 972 973 /* These structures hold the attributes of bpf state that are being passed 974 * to the netdevice through the bpf op. 975 */ 976 enum bpf_netdev_command { 977 /* Set or clear a bpf program used in the earliest stages of packet 978 * rx. The prog will have been loaded as BPF_PROG_TYPE_XDP. The callee 979 * is responsible for calling bpf_prog_put on any old progs that are 980 * stored. In case of error, the callee need not release the new prog 981 * reference, but on success it takes ownership and must bpf_prog_put 982 * when it is no longer used. 983 */ 984 XDP_SETUP_PROG, 985 XDP_SETUP_PROG_HW, 986 /* BPF program for offload callbacks, invoked at program load time. */ 987 BPF_OFFLOAD_MAP_ALLOC, 988 BPF_OFFLOAD_MAP_FREE, 989 XDP_SETUP_XSK_POOL, 990 }; 991 992 struct bpf_prog_offload_ops; 993 struct netlink_ext_ack; 994 struct xdp_umem; 995 struct xdp_dev_bulk_queue; 996 struct bpf_xdp_link; 997 998 enum bpf_xdp_mode { 999 XDP_MODE_SKB = 0, 1000 XDP_MODE_DRV = 1, 1001 XDP_MODE_HW = 2, 1002 __MAX_XDP_MODE 1003 }; 1004 1005 struct bpf_xdp_entity { 1006 struct bpf_prog *prog; 1007 struct bpf_xdp_link *link; 1008 }; 1009 1010 struct netdev_bpf { 1011 enum bpf_netdev_command command; 1012 union { 1013 /* XDP_SETUP_PROG */ 1014 struct { 1015 u32 flags; 1016 struct bpf_prog *prog; 1017 struct netlink_ext_ack *extack; 1018 }; 1019 /* BPF_OFFLOAD_MAP_ALLOC, BPF_OFFLOAD_MAP_FREE */ 1020 struct { 1021 struct bpf_offloaded_map *offmap; 1022 }; 1023 /* XDP_SETUP_XSK_POOL */ 1024 struct { 1025 struct xsk_buff_pool *pool; 1026 u16 queue_id; 1027 } xsk; 1028 }; 1029 }; 1030 1031 /* Flags for ndo_xsk_wakeup. */ 1032 #define XDP_WAKEUP_RX (1 << 0) 1033 #define XDP_WAKEUP_TX (1 << 1) 1034 1035 #ifdef CONFIG_XFRM_OFFLOAD 1036 struct xfrmdev_ops { 1037 int (*xdo_dev_state_add)(struct net_device *dev, 1038 struct xfrm_state *x, 1039 struct netlink_ext_ack *extack); 1040 void (*xdo_dev_state_delete)(struct net_device *dev, 1041 struct xfrm_state *x); 1042 void (*xdo_dev_state_free)(struct net_device *dev, 1043 struct xfrm_state *x); 1044 bool (*xdo_dev_offload_ok) (struct sk_buff *skb, 1045 struct xfrm_state *x); 1046 void (*xdo_dev_state_advance_esn) (struct xfrm_state *x); 1047 void (*xdo_dev_state_update_stats) (struct xfrm_state *x); 1048 int (*xdo_dev_policy_add) (struct xfrm_policy *x, struct netlink_ext_ack *extack); 1049 void (*xdo_dev_policy_delete) (struct xfrm_policy *x); 1050 void (*xdo_dev_policy_free) (struct xfrm_policy *x); 1051 }; 1052 #endif 1053 1054 struct dev_ifalias { 1055 struct rcu_head rcuhead; 1056 char ifalias[]; 1057 }; 1058 1059 struct devlink; 1060 struct tlsdev_ops; 1061 1062 struct netdev_net_notifier { 1063 struct list_head list; 1064 struct notifier_block *nb; 1065 }; 1066 1067 /* 1068 * This structure defines the management hooks for network devices. 1069 * The following hooks can be defined; unless noted otherwise, they are 1070 * optional and can be filled with a null pointer. 1071 * 1072 * int (*ndo_init)(struct net_device *dev); 1073 * This function is called once when a network device is registered. 1074 * The network device can use this for any late stage initialization 1075 * or semantic validation. It can fail with an error code which will 1076 * be propagated back to register_netdev. 1077 * 1078 * void (*ndo_uninit)(struct net_device *dev); 1079 * This function is called when device is unregistered or when registration 1080 * fails. It is not called if init fails. 1081 * 1082 * int (*ndo_open)(struct net_device *dev); 1083 * This function is called when a network device transitions to the up 1084 * state. 1085 * 1086 * int (*ndo_stop)(struct net_device *dev); 1087 * This function is called when a network device transitions to the down 1088 * state. 1089 * 1090 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb, 1091 * struct net_device *dev); 1092 * Called when a packet needs to be transmitted. 1093 * Returns NETDEV_TX_OK. Can return NETDEV_TX_BUSY, but you should stop 1094 * the queue before that can happen; it's for obsolete devices and weird 1095 * corner cases, but the stack really does a non-trivial amount 1096 * of useless work if you return NETDEV_TX_BUSY. 1097 * Required; cannot be NULL. 1098 * 1099 * netdev_features_t (*ndo_features_check)(struct sk_buff *skb, 1100 * struct net_device *dev 1101 * netdev_features_t features); 1102 * Called by core transmit path to determine if device is capable of 1103 * performing offload operations on a given packet. This is to give 1104 * the device an opportunity to implement any restrictions that cannot 1105 * be otherwise expressed by feature flags. The check is called with 1106 * the set of features that the stack has calculated and it returns 1107 * those the driver believes to be appropriate. 1108 * 1109 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb, 1110 * struct net_device *sb_dev); 1111 * Called to decide which queue to use when device supports multiple 1112 * transmit queues. 1113 * 1114 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags); 1115 * This function is called to allow device receiver to make 1116 * changes to configuration when multicast or promiscuous is enabled. 1117 * 1118 * void (*ndo_set_rx_mode)(struct net_device *dev); 1119 * This function is called device changes address list filtering. 1120 * If driver handles unicast address filtering, it should set 1121 * IFF_UNICAST_FLT in its priv_flags. 1122 * 1123 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr); 1124 * This function is called when the Media Access Control address 1125 * needs to be changed. If this interface is not defined, the 1126 * MAC address can not be changed. 1127 * 1128 * int (*ndo_validate_addr)(struct net_device *dev); 1129 * Test if Media Access Control address is valid for the device. 1130 * 1131 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd); 1132 * Old-style ioctl entry point. This is used internally by the 1133 * ieee802154 subsystem but is no longer called by the device 1134 * ioctl handler. 1135 * 1136 * int (*ndo_siocbond)(struct net_device *dev, struct ifreq *ifr, int cmd); 1137 * Used by the bonding driver for its device specific ioctls: 1138 * SIOCBONDENSLAVE, SIOCBONDRELEASE, SIOCBONDSETHWADDR, SIOCBONDCHANGEACTIVE, 1139 * SIOCBONDSLAVEINFOQUERY, and SIOCBONDINFOQUERY 1140 * 1141 * * int (*ndo_eth_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd); 1142 * Called for ethernet specific ioctls: SIOCGMIIPHY, SIOCGMIIREG, 1143 * SIOCSMIIREG, SIOCSHWTSTAMP and SIOCGHWTSTAMP. 1144 * 1145 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map); 1146 * Used to set network devices bus interface parameters. This interface 1147 * is retained for legacy reasons; new devices should use the bus 1148 * interface (PCI) for low level management. 1149 * 1150 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu); 1151 * Called when a user wants to change the Maximum Transfer Unit 1152 * of a device. 1153 * 1154 * void (*ndo_tx_timeout)(struct net_device *dev, unsigned int txqueue); 1155 * Callback used when the transmitter has not made any progress 1156 * for dev->watchdog ticks. 1157 * 1158 * void (*ndo_get_stats64)(struct net_device *dev, 1159 * struct rtnl_link_stats64 *storage); 1160 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev); 1161 * Called when a user wants to get the network device usage 1162 * statistics. Drivers must do one of the following: 1163 * 1. Define @ndo_get_stats64 to fill in a zero-initialised 1164 * rtnl_link_stats64 structure passed by the caller. 1165 * 2. Define @ndo_get_stats to update a net_device_stats structure 1166 * (which should normally be dev->stats) and return a pointer to 1167 * it. The structure may be changed asynchronously only if each 1168 * field is written atomically. 1169 * 3. Update dev->stats asynchronously and atomically, and define 1170 * neither operation. 1171 * 1172 * bool (*ndo_has_offload_stats)(const struct net_device *dev, int attr_id) 1173 * Return true if this device supports offload stats of this attr_id. 1174 * 1175 * int (*ndo_get_offload_stats)(int attr_id, const struct net_device *dev, 1176 * void *attr_data) 1177 * Get statistics for offload operations by attr_id. Write it into the 1178 * attr_data pointer. 1179 * 1180 * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, __be16 proto, u16 vid); 1181 * If device supports VLAN filtering this function is called when a 1182 * VLAN id is registered. 1183 * 1184 * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, __be16 proto, u16 vid); 1185 * If device supports VLAN filtering this function is called when a 1186 * VLAN id is unregistered. 1187 * 1188 * void (*ndo_poll_controller)(struct net_device *dev); 1189 * 1190 * SR-IOV management functions. 1191 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac); 1192 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, 1193 * u8 qos, __be16 proto); 1194 * int (*ndo_set_vf_rate)(struct net_device *dev, int vf, int min_tx_rate, 1195 * int max_tx_rate); 1196 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting); 1197 * int (*ndo_set_vf_trust)(struct net_device *dev, int vf, bool setting); 1198 * int (*ndo_get_vf_config)(struct net_device *dev, 1199 * int vf, struct ifla_vf_info *ivf); 1200 * int (*ndo_set_vf_link_state)(struct net_device *dev, int vf, int link_state); 1201 * int (*ndo_set_vf_port)(struct net_device *dev, int vf, 1202 * struct nlattr *port[]); 1203 * 1204 * Enable or disable the VF ability to query its RSS Redirection Table and 1205 * Hash Key. This is needed since on some devices VF share this information 1206 * with PF and querying it may introduce a theoretical security risk. 1207 * int (*ndo_set_vf_rss_query_en)(struct net_device *dev, int vf, bool setting); 1208 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb); 1209 * int (*ndo_setup_tc)(struct net_device *dev, enum tc_setup_type type, 1210 * void *type_data); 1211 * Called to setup any 'tc' scheduler, classifier or action on @dev. 1212 * This is always called from the stack with the rtnl lock held and netif 1213 * tx queues stopped. This allows the netdevice to perform queue 1214 * management safely. 1215 * 1216 * Fiber Channel over Ethernet (FCoE) offload functions. 1217 * int (*ndo_fcoe_enable)(struct net_device *dev); 1218 * Called when the FCoE protocol stack wants to start using LLD for FCoE 1219 * so the underlying device can perform whatever needed configuration or 1220 * initialization to support acceleration of FCoE traffic. 1221 * 1222 * int (*ndo_fcoe_disable)(struct net_device *dev); 1223 * Called when the FCoE protocol stack wants to stop using LLD for FCoE 1224 * so the underlying device can perform whatever needed clean-ups to 1225 * stop supporting acceleration of FCoE traffic. 1226 * 1227 * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid, 1228 * struct scatterlist *sgl, unsigned int sgc); 1229 * Called when the FCoE Initiator wants to initialize an I/O that 1230 * is a possible candidate for Direct Data Placement (DDP). The LLD can 1231 * perform necessary setup and returns 1 to indicate the device is set up 1232 * successfully to perform DDP on this I/O, otherwise this returns 0. 1233 * 1234 * int (*ndo_fcoe_ddp_done)(struct net_device *dev, u16 xid); 1235 * Called when the FCoE Initiator/Target is done with the DDPed I/O as 1236 * indicated by the FC exchange id 'xid', so the underlying device can 1237 * clean up and reuse resources for later DDP requests. 1238 * 1239 * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid, 1240 * struct scatterlist *sgl, unsigned int sgc); 1241 * Called when the FCoE Target wants to initialize an I/O that 1242 * is a possible candidate for Direct Data Placement (DDP). The LLD can 1243 * perform necessary setup and returns 1 to indicate the device is set up 1244 * successfully to perform DDP on this I/O, otherwise this returns 0. 1245 * 1246 * int (*ndo_fcoe_get_hbainfo)(struct net_device *dev, 1247 * struct netdev_fcoe_hbainfo *hbainfo); 1248 * Called when the FCoE Protocol stack wants information on the underlying 1249 * device. This information is utilized by the FCoE protocol stack to 1250 * register attributes with Fiber Channel management service as per the 1251 * FC-GS Fabric Device Management Information(FDMI) specification. 1252 * 1253 * int (*ndo_fcoe_get_wwn)(struct net_device *dev, u64 *wwn, int type); 1254 * Called when the underlying device wants to override default World Wide 1255 * Name (WWN) generation mechanism in FCoE protocol stack to pass its own 1256 * World Wide Port Name (WWPN) or World Wide Node Name (WWNN) to the FCoE 1257 * protocol stack to use. 1258 * 1259 * RFS acceleration. 1260 * int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb, 1261 * u16 rxq_index, u32 flow_id); 1262 * Set hardware filter for RFS. rxq_index is the target queue index; 1263 * flow_id is a flow ID to be passed to rps_may_expire_flow() later. 1264 * Return the filter ID on success, or a negative error code. 1265 * 1266 * Slave management functions (for bridge, bonding, etc). 1267 * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev); 1268 * Called to make another netdev an underling. 1269 * 1270 * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev); 1271 * Called to release previously enslaved netdev. 1272 * 1273 * struct net_device *(*ndo_get_xmit_slave)(struct net_device *dev, 1274 * struct sk_buff *skb, 1275 * bool all_slaves); 1276 * Get the xmit slave of master device. If all_slaves is true, function 1277 * assume all the slaves can transmit. 1278 * 1279 * Feature/offload setting functions. 1280 * netdev_features_t (*ndo_fix_features)(struct net_device *dev, 1281 * netdev_features_t features); 1282 * Adjusts the requested feature flags according to device-specific 1283 * constraints, and returns the resulting flags. Must not modify 1284 * the device state. 1285 * 1286 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features); 1287 * Called to update device configuration to new features. Passed 1288 * feature set might be less than what was returned by ndo_fix_features()). 1289 * Must return >0 or -errno if it changed dev->features itself. 1290 * 1291 * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[], 1292 * struct net_device *dev, 1293 * const unsigned char *addr, u16 vid, u16 flags, 1294 * bool *notified, struct netlink_ext_ack *extack); 1295 * Adds an FDB entry to dev for addr. 1296 * Callee shall set *notified to true if it sent any appropriate 1297 * notification(s). Otherwise core will send a generic one. 1298 * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[], 1299 * struct net_device *dev, 1300 * const unsigned char *addr, u16 vid 1301 * bool *notified, struct netlink_ext_ack *extack); 1302 * Deletes the FDB entry from dev corresponding to addr. 1303 * Callee shall set *notified to true if it sent any appropriate 1304 * notification(s). Otherwise core will send a generic one. 1305 * int (*ndo_fdb_del_bulk)(struct nlmsghdr *nlh, struct net_device *dev, 1306 * struct netlink_ext_ack *extack); 1307 * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb, 1308 * struct net_device *dev, struct net_device *filter_dev, 1309 * int *idx) 1310 * Used to add FDB entries to dump requests. Implementers should add 1311 * entries to skb and update idx with the number of entries. 1312 * 1313 * int (*ndo_mdb_add)(struct net_device *dev, struct nlattr *tb[], 1314 * u16 nlmsg_flags, struct netlink_ext_ack *extack); 1315 * Adds an MDB entry to dev. 1316 * int (*ndo_mdb_del)(struct net_device *dev, struct nlattr *tb[], 1317 * struct netlink_ext_ack *extack); 1318 * Deletes the MDB entry from dev. 1319 * int (*ndo_mdb_del_bulk)(struct net_device *dev, struct nlattr *tb[], 1320 * struct netlink_ext_ack *extack); 1321 * Bulk deletes MDB entries from dev. 1322 * int (*ndo_mdb_dump)(struct net_device *dev, struct sk_buff *skb, 1323 * struct netlink_callback *cb); 1324 * Dumps MDB entries from dev. The first argument (marker) in the netlink 1325 * callback is used by core rtnetlink code. 1326 * 1327 * int (*ndo_bridge_setlink)(struct net_device *dev, struct nlmsghdr *nlh, 1328 * u16 flags, struct netlink_ext_ack *extack) 1329 * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq, 1330 * struct net_device *dev, u32 filter_mask, 1331 * int nlflags) 1332 * int (*ndo_bridge_dellink)(struct net_device *dev, struct nlmsghdr *nlh, 1333 * u16 flags); 1334 * 1335 * int (*ndo_change_carrier)(struct net_device *dev, bool new_carrier); 1336 * Called to change device carrier. Soft-devices (like dummy, team, etc) 1337 * which do not represent real hardware may define this to allow their 1338 * userspace components to manage their virtual carrier state. Devices 1339 * that determine carrier state from physical hardware properties (eg 1340 * network cables) or protocol-dependent mechanisms (eg 1341 * USB_CDC_NOTIFY_NETWORK_CONNECTION) should NOT implement this function. 1342 * 1343 * int (*ndo_get_phys_port_id)(struct net_device *dev, 1344 * struct netdev_phys_item_id *ppid); 1345 * Called to get ID of physical port of this device. If driver does 1346 * not implement this, it is assumed that the hw is not able to have 1347 * multiple net devices on single physical port. 1348 * 1349 * int (*ndo_get_port_parent_id)(struct net_device *dev, 1350 * struct netdev_phys_item_id *ppid) 1351 * Called to get the parent ID of the physical port of this device. 1352 * 1353 * void* (*ndo_dfwd_add_station)(struct net_device *pdev, 1354 * struct net_device *dev) 1355 * Called by upper layer devices to accelerate switching or other 1356 * station functionality into hardware. 'pdev is the lowerdev 1357 * to use for the offload and 'dev' is the net device that will 1358 * back the offload. Returns a pointer to the private structure 1359 * the upper layer will maintain. 1360 * void (*ndo_dfwd_del_station)(struct net_device *pdev, void *priv) 1361 * Called by upper layer device to delete the station created 1362 * by 'ndo_dfwd_add_station'. 'pdev' is the net device backing 1363 * the station and priv is the structure returned by the add 1364 * operation. 1365 * int (*ndo_set_tx_maxrate)(struct net_device *dev, 1366 * int queue_index, u32 maxrate); 1367 * Called when a user wants to set a max-rate limitation of specific 1368 * TX queue. 1369 * int (*ndo_get_iflink)(const struct net_device *dev); 1370 * Called to get the iflink value of this device. 1371 * int (*ndo_fill_metadata_dst)(struct net_device *dev, struct sk_buff *skb); 1372 * This function is used to get egress tunnel information for given skb. 1373 * This is useful for retrieving outer tunnel header parameters while 1374 * sampling packet. 1375 * void (*ndo_set_rx_headroom)(struct net_device *dev, int needed_headroom); 1376 * This function is used to specify the headroom that the skb must 1377 * consider when allocation skb during packet reception. Setting 1378 * appropriate rx headroom value allows avoiding skb head copy on 1379 * forward. Setting a negative value resets the rx headroom to the 1380 * default value. 1381 * int (*ndo_bpf)(struct net_device *dev, struct netdev_bpf *bpf); 1382 * This function is used to set or query state related to XDP on the 1383 * netdevice and manage BPF offload. See definition of 1384 * enum bpf_netdev_command for details. 1385 * int (*ndo_xdp_xmit)(struct net_device *dev, int n, struct xdp_frame **xdp, 1386 * u32 flags); 1387 * This function is used to submit @n XDP packets for transmit on a 1388 * netdevice. Returns number of frames successfully transmitted, frames 1389 * that got dropped are freed/returned via xdp_return_frame(). 1390 * Returns negative number, means general error invoking ndo, meaning 1391 * no frames were xmit'ed and core-caller will free all frames. 1392 * struct net_device *(*ndo_xdp_get_xmit_slave)(struct net_device *dev, 1393 * struct xdp_buff *xdp); 1394 * Get the xmit slave of master device based on the xdp_buff. 1395 * int (*ndo_xsk_wakeup)(struct net_device *dev, u32 queue_id, u32 flags); 1396 * This function is used to wake up the softirq, ksoftirqd or kthread 1397 * responsible for sending and/or receiving packets on a specific 1398 * queue id bound to an AF_XDP socket. The flags field specifies if 1399 * only RX, only Tx, or both should be woken up using the flags 1400 * XDP_WAKEUP_RX and XDP_WAKEUP_TX. 1401 * int (*ndo_tunnel_ctl)(struct net_device *dev, struct ip_tunnel_parm_kern *p, 1402 * int cmd); 1403 * Add, change, delete or get information on an IPv4 tunnel. 1404 * struct net_device *(*ndo_get_peer_dev)(struct net_device *dev); 1405 * If a device is paired with a peer device, return the peer instance. 1406 * The caller must be under RCU read context. 1407 * int (*ndo_fill_forward_path)(struct net_device_path_ctx *ctx, struct net_device_path *path); 1408 * Get the forwarding path to reach the real device from the HW destination address 1409 * ktime_t (*ndo_get_tstamp)(struct net_device *dev, 1410 * const struct skb_shared_hwtstamps *hwtstamps, 1411 * bool cycles); 1412 * Get hardware timestamp based on normal/adjustable time or free running 1413 * cycle counter. This function is required if physical clock supports a 1414 * free running cycle counter. 1415 * 1416 * int (*ndo_hwtstamp_get)(struct net_device *dev, 1417 * struct kernel_hwtstamp_config *kernel_config); 1418 * Get the currently configured hardware timestamping parameters for the 1419 * NIC device. 1420 * 1421 * int (*ndo_hwtstamp_set)(struct net_device *dev, 1422 * struct kernel_hwtstamp_config *kernel_config, 1423 * struct netlink_ext_ack *extack); 1424 * Change the hardware timestamping parameters for NIC device. 1425 */ 1426 struct net_device_ops { 1427 int (*ndo_init)(struct net_device *dev); 1428 void (*ndo_uninit)(struct net_device *dev); 1429 int (*ndo_open)(struct net_device *dev); 1430 int (*ndo_stop)(struct net_device *dev); 1431 netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb, 1432 struct net_device *dev); 1433 netdev_features_t (*ndo_features_check)(struct sk_buff *skb, 1434 struct net_device *dev, 1435 netdev_features_t features); 1436 u16 (*ndo_select_queue)(struct net_device *dev, 1437 struct sk_buff *skb, 1438 struct net_device *sb_dev); 1439 void (*ndo_change_rx_flags)(struct net_device *dev, 1440 int flags); 1441 void (*ndo_set_rx_mode)(struct net_device *dev); 1442 int (*ndo_set_mac_address)(struct net_device *dev, 1443 void *addr); 1444 int (*ndo_validate_addr)(struct net_device *dev); 1445 int (*ndo_do_ioctl)(struct net_device *dev, 1446 struct ifreq *ifr, int cmd); 1447 int (*ndo_eth_ioctl)(struct net_device *dev, 1448 struct ifreq *ifr, int cmd); 1449 int (*ndo_siocbond)(struct net_device *dev, 1450 struct ifreq *ifr, int cmd); 1451 int (*ndo_siocwandev)(struct net_device *dev, 1452 struct if_settings *ifs); 1453 int (*ndo_siocdevprivate)(struct net_device *dev, 1454 struct ifreq *ifr, 1455 void __user *data, int cmd); 1456 int (*ndo_set_config)(struct net_device *dev, 1457 struct ifmap *map); 1458 int (*ndo_change_mtu)(struct net_device *dev, 1459 int new_mtu); 1460 int (*ndo_neigh_setup)(struct net_device *dev, 1461 struct neigh_parms *); 1462 void (*ndo_tx_timeout) (struct net_device *dev, 1463 unsigned int txqueue); 1464 1465 void (*ndo_get_stats64)(struct net_device *dev, 1466 struct rtnl_link_stats64 *storage); 1467 bool (*ndo_has_offload_stats)(const struct net_device *dev, int attr_id); 1468 int (*ndo_get_offload_stats)(int attr_id, 1469 const struct net_device *dev, 1470 void *attr_data); 1471 struct net_device_stats* (*ndo_get_stats)(struct net_device *dev); 1472 1473 int (*ndo_vlan_rx_add_vid)(struct net_device *dev, 1474 __be16 proto, u16 vid); 1475 int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, 1476 __be16 proto, u16 vid); 1477 #ifdef CONFIG_NET_POLL_CONTROLLER 1478 void (*ndo_poll_controller)(struct net_device *dev); 1479 int (*ndo_netpoll_setup)(struct net_device *dev); 1480 void (*ndo_netpoll_cleanup)(struct net_device *dev); 1481 #endif 1482 int (*ndo_set_vf_mac)(struct net_device *dev, 1483 int queue, u8 *mac); 1484 int (*ndo_set_vf_vlan)(struct net_device *dev, 1485 int queue, u16 vlan, 1486 u8 qos, __be16 proto); 1487 int (*ndo_set_vf_rate)(struct net_device *dev, 1488 int vf, int min_tx_rate, 1489 int max_tx_rate); 1490 int (*ndo_set_vf_spoofchk)(struct net_device *dev, 1491 int vf, bool setting); 1492 int (*ndo_set_vf_trust)(struct net_device *dev, 1493 int vf, bool setting); 1494 int (*ndo_get_vf_config)(struct net_device *dev, 1495 int vf, 1496 struct ifla_vf_info *ivf); 1497 int (*ndo_set_vf_link_state)(struct net_device *dev, 1498 int vf, int link_state); 1499 int (*ndo_get_vf_stats)(struct net_device *dev, 1500 int vf, 1501 struct ifla_vf_stats 1502 *vf_stats); 1503 int (*ndo_set_vf_port)(struct net_device *dev, 1504 int vf, 1505 struct nlattr *port[]); 1506 int (*ndo_get_vf_port)(struct net_device *dev, 1507 int vf, struct sk_buff *skb); 1508 int (*ndo_get_vf_guid)(struct net_device *dev, 1509 int vf, 1510 struct ifla_vf_guid *node_guid, 1511 struct ifla_vf_guid *port_guid); 1512 int (*ndo_set_vf_guid)(struct net_device *dev, 1513 int vf, u64 guid, 1514 int guid_type); 1515 int (*ndo_set_vf_rss_query_en)( 1516 struct net_device *dev, 1517 int vf, bool setting); 1518 int (*ndo_setup_tc)(struct net_device *dev, 1519 enum tc_setup_type type, 1520 void *type_data); 1521 #if IS_ENABLED(CONFIG_FCOE) 1522 int (*ndo_fcoe_enable)(struct net_device *dev); 1523 int (*ndo_fcoe_disable)(struct net_device *dev); 1524 int (*ndo_fcoe_ddp_setup)(struct net_device *dev, 1525 u16 xid, 1526 struct scatterlist *sgl, 1527 unsigned int sgc); 1528 int (*ndo_fcoe_ddp_done)(struct net_device *dev, 1529 u16 xid); 1530 int (*ndo_fcoe_ddp_target)(struct net_device *dev, 1531 u16 xid, 1532 struct scatterlist *sgl, 1533 unsigned int sgc); 1534 int (*ndo_fcoe_get_hbainfo)(struct net_device *dev, 1535 struct netdev_fcoe_hbainfo *hbainfo); 1536 #endif 1537 1538 #if IS_ENABLED(CONFIG_LIBFCOE) 1539 #define NETDEV_FCOE_WWNN 0 1540 #define NETDEV_FCOE_WWPN 1 1541 int (*ndo_fcoe_get_wwn)(struct net_device *dev, 1542 u64 *wwn, int type); 1543 #endif 1544 1545 #ifdef CONFIG_RFS_ACCEL 1546 int (*ndo_rx_flow_steer)(struct net_device *dev, 1547 const struct sk_buff *skb, 1548 u16 rxq_index, 1549 u32 flow_id); 1550 #endif 1551 int (*ndo_add_slave)(struct net_device *dev, 1552 struct net_device *slave_dev, 1553 struct netlink_ext_ack *extack); 1554 int (*ndo_del_slave)(struct net_device *dev, 1555 struct net_device *slave_dev); 1556 struct net_device* (*ndo_get_xmit_slave)(struct net_device *dev, 1557 struct sk_buff *skb, 1558 bool all_slaves); 1559 struct net_device* (*ndo_sk_get_lower_dev)(struct net_device *dev, 1560 struct sock *sk); 1561 netdev_features_t (*ndo_fix_features)(struct net_device *dev, 1562 netdev_features_t features); 1563 int (*ndo_set_features)(struct net_device *dev, 1564 netdev_features_t features); 1565 int (*ndo_neigh_construct)(struct net_device *dev, 1566 struct neighbour *n); 1567 void (*ndo_neigh_destroy)(struct net_device *dev, 1568 struct neighbour *n); 1569 1570 int (*ndo_fdb_add)(struct ndmsg *ndm, 1571 struct nlattr *tb[], 1572 struct net_device *dev, 1573 const unsigned char *addr, 1574 u16 vid, 1575 u16 flags, 1576 bool *notified, 1577 struct netlink_ext_ack *extack); 1578 int (*ndo_fdb_del)(struct ndmsg *ndm, 1579 struct nlattr *tb[], 1580 struct net_device *dev, 1581 const unsigned char *addr, 1582 u16 vid, 1583 bool *notified, 1584 struct netlink_ext_ack *extack); 1585 int (*ndo_fdb_del_bulk)(struct nlmsghdr *nlh, 1586 struct net_device *dev, 1587 struct netlink_ext_ack *extack); 1588 int (*ndo_fdb_dump)(struct sk_buff *skb, 1589 struct netlink_callback *cb, 1590 struct net_device *dev, 1591 struct net_device *filter_dev, 1592 int *idx); 1593 int (*ndo_fdb_get)(struct sk_buff *skb, 1594 struct nlattr *tb[], 1595 struct net_device *dev, 1596 const unsigned char *addr, 1597 u16 vid, u32 portid, u32 seq, 1598 struct netlink_ext_ack *extack); 1599 int (*ndo_mdb_add)(struct net_device *dev, 1600 struct nlattr *tb[], 1601 u16 nlmsg_flags, 1602 struct netlink_ext_ack *extack); 1603 int (*ndo_mdb_del)(struct net_device *dev, 1604 struct nlattr *tb[], 1605 struct netlink_ext_ack *extack); 1606 int (*ndo_mdb_del_bulk)(struct net_device *dev, 1607 struct nlattr *tb[], 1608 struct netlink_ext_ack *extack); 1609 int (*ndo_mdb_dump)(struct net_device *dev, 1610 struct sk_buff *skb, 1611 struct netlink_callback *cb); 1612 int (*ndo_mdb_get)(struct net_device *dev, 1613 struct nlattr *tb[], u32 portid, 1614 u32 seq, 1615 struct netlink_ext_ack *extack); 1616 int (*ndo_bridge_setlink)(struct net_device *dev, 1617 struct nlmsghdr *nlh, 1618 u16 flags, 1619 struct netlink_ext_ack *extack); 1620 int (*ndo_bridge_getlink)(struct sk_buff *skb, 1621 u32 pid, u32 seq, 1622 struct net_device *dev, 1623 u32 filter_mask, 1624 int nlflags); 1625 int (*ndo_bridge_dellink)(struct net_device *dev, 1626 struct nlmsghdr *nlh, 1627 u16 flags); 1628 int (*ndo_change_carrier)(struct net_device *dev, 1629 bool new_carrier); 1630 int (*ndo_get_phys_port_id)(struct net_device *dev, 1631 struct netdev_phys_item_id *ppid); 1632 int (*ndo_get_port_parent_id)(struct net_device *dev, 1633 struct netdev_phys_item_id *ppid); 1634 int (*ndo_get_phys_port_name)(struct net_device *dev, 1635 char *name, size_t len); 1636 void* (*ndo_dfwd_add_station)(struct net_device *pdev, 1637 struct net_device *dev); 1638 void (*ndo_dfwd_del_station)(struct net_device *pdev, 1639 void *priv); 1640 1641 int (*ndo_set_tx_maxrate)(struct net_device *dev, 1642 int queue_index, 1643 u32 maxrate); 1644 int (*ndo_get_iflink)(const struct net_device *dev); 1645 int (*ndo_fill_metadata_dst)(struct net_device *dev, 1646 struct sk_buff *skb); 1647 void (*ndo_set_rx_headroom)(struct net_device *dev, 1648 int needed_headroom); 1649 int (*ndo_bpf)(struct net_device *dev, 1650 struct netdev_bpf *bpf); 1651 int (*ndo_xdp_xmit)(struct net_device *dev, int n, 1652 struct xdp_frame **xdp, 1653 u32 flags); 1654 struct net_device * (*ndo_xdp_get_xmit_slave)(struct net_device *dev, 1655 struct xdp_buff *xdp); 1656 int (*ndo_xsk_wakeup)(struct net_device *dev, 1657 u32 queue_id, u32 flags); 1658 int (*ndo_tunnel_ctl)(struct net_device *dev, 1659 struct ip_tunnel_parm_kern *p, 1660 int cmd); 1661 struct net_device * (*ndo_get_peer_dev)(struct net_device *dev); 1662 int (*ndo_fill_forward_path)(struct net_device_path_ctx *ctx, 1663 struct net_device_path *path); 1664 ktime_t (*ndo_get_tstamp)(struct net_device *dev, 1665 const struct skb_shared_hwtstamps *hwtstamps, 1666 bool cycles); 1667 int (*ndo_hwtstamp_get)(struct net_device *dev, 1668 struct kernel_hwtstamp_config *kernel_config); 1669 int (*ndo_hwtstamp_set)(struct net_device *dev, 1670 struct kernel_hwtstamp_config *kernel_config, 1671 struct netlink_ext_ack *extack); 1672 1673 #if IS_ENABLED(CONFIG_NET_SHAPER) 1674 /** 1675 * @net_shaper_ops: Device shaping offload operations 1676 * see include/net/net_shapers.h 1677 */ 1678 const struct net_shaper_ops *net_shaper_ops; 1679 #endif 1680 }; 1681 1682 /** 1683 * enum netdev_priv_flags - &struct net_device priv_flags 1684 * 1685 * These are the &struct net_device, they are only set internally 1686 * by drivers and used in the kernel. These flags are invisible to 1687 * userspace; this means that the order of these flags can change 1688 * during any kernel release. 1689 * 1690 * You should add bitfield booleans after either net_device::priv_flags 1691 * (hotpath) or ::threaded (slowpath) instead of extending these flags. 1692 * 1693 * @IFF_802_1Q_VLAN: 802.1Q VLAN device 1694 * @IFF_EBRIDGE: Ethernet bridging device 1695 * @IFF_BONDING: bonding master or slave 1696 * @IFF_ISATAP: ISATAP interface (RFC4214) 1697 * @IFF_WAN_HDLC: WAN HDLC device 1698 * @IFF_XMIT_DST_RELEASE: dev_hard_start_xmit() is allowed to 1699 * release skb->dst 1700 * @IFF_DONT_BRIDGE: disallow bridging this ether dev 1701 * @IFF_DISABLE_NETPOLL: disable netpoll at run-time 1702 * @IFF_MACVLAN_PORT: device used as macvlan port 1703 * @IFF_BRIDGE_PORT: device used as bridge port 1704 * @IFF_OVS_DATAPATH: device used as Open vSwitch datapath port 1705 * @IFF_TX_SKB_SHARING: The interface supports sharing skbs on transmit 1706 * @IFF_UNICAST_FLT: Supports unicast filtering 1707 * @IFF_TEAM_PORT: device used as team port 1708 * @IFF_SUPP_NOFCS: device supports sending custom FCS 1709 * @IFF_LIVE_ADDR_CHANGE: device supports hardware address 1710 * change when it's running 1711 * @IFF_MACVLAN: Macvlan device 1712 * @IFF_XMIT_DST_RELEASE_PERM: IFF_XMIT_DST_RELEASE not taking into account 1713 * underlying stacked devices 1714 * @IFF_L3MDEV_MASTER: device is an L3 master device 1715 * @IFF_NO_QUEUE: device can run without qdisc attached 1716 * @IFF_OPENVSWITCH: device is a Open vSwitch master 1717 * @IFF_L3MDEV_SLAVE: device is enslaved to an L3 master device 1718 * @IFF_TEAM: device is a team device 1719 * @IFF_PHONY_HEADROOM: the headroom value is controlled by an external 1720 * entity (i.e. the master device for bridged veth) 1721 * @IFF_MACSEC: device is a MACsec device 1722 * @IFF_NO_RX_HANDLER: device doesn't support the rx_handler hook 1723 * @IFF_FAILOVER: device is a failover master device 1724 * @IFF_FAILOVER_SLAVE: device is lower dev of a failover master device 1725 * @IFF_L3MDEV_RX_HANDLER: only invoke the rx handler of L3 master device 1726 * @IFF_NO_ADDRCONF: prevent ipv6 addrconf 1727 * @IFF_TX_SKB_NO_LINEAR: device/driver is capable of xmitting frames with 1728 * skb_headlen(skb) == 0 (data starts from frag0) 1729 */ 1730 enum netdev_priv_flags { 1731 IFF_802_1Q_VLAN = 1<<0, 1732 IFF_EBRIDGE = 1<<1, 1733 IFF_BONDING = 1<<2, 1734 IFF_ISATAP = 1<<3, 1735 IFF_WAN_HDLC = 1<<4, 1736 IFF_XMIT_DST_RELEASE = 1<<5, 1737 IFF_DONT_BRIDGE = 1<<6, 1738 IFF_DISABLE_NETPOLL = 1<<7, 1739 IFF_MACVLAN_PORT = 1<<8, 1740 IFF_BRIDGE_PORT = 1<<9, 1741 IFF_OVS_DATAPATH = 1<<10, 1742 IFF_TX_SKB_SHARING = 1<<11, 1743 IFF_UNICAST_FLT = 1<<12, 1744 IFF_TEAM_PORT = 1<<13, 1745 IFF_SUPP_NOFCS = 1<<14, 1746 IFF_LIVE_ADDR_CHANGE = 1<<15, 1747 IFF_MACVLAN = 1<<16, 1748 IFF_XMIT_DST_RELEASE_PERM = 1<<17, 1749 IFF_L3MDEV_MASTER = 1<<18, 1750 IFF_NO_QUEUE = 1<<19, 1751 IFF_OPENVSWITCH = 1<<20, 1752 IFF_L3MDEV_SLAVE = 1<<21, 1753 IFF_TEAM = 1<<22, 1754 IFF_PHONY_HEADROOM = 1<<24, 1755 IFF_MACSEC = 1<<25, 1756 IFF_NO_RX_HANDLER = 1<<26, 1757 IFF_FAILOVER = 1<<27, 1758 IFF_FAILOVER_SLAVE = 1<<28, 1759 IFF_L3MDEV_RX_HANDLER = 1<<29, 1760 IFF_NO_ADDRCONF = BIT_ULL(30), 1761 IFF_TX_SKB_NO_LINEAR = BIT_ULL(31), 1762 }; 1763 1764 /* Specifies the type of the struct net_device::ml_priv pointer */ 1765 enum netdev_ml_priv_type { 1766 ML_PRIV_NONE, 1767 ML_PRIV_CAN, 1768 }; 1769 1770 enum netdev_stat_type { 1771 NETDEV_PCPU_STAT_NONE, 1772 NETDEV_PCPU_STAT_LSTATS, /* struct pcpu_lstats */ 1773 NETDEV_PCPU_STAT_TSTATS, /* struct pcpu_sw_netstats */ 1774 NETDEV_PCPU_STAT_DSTATS, /* struct pcpu_dstats */ 1775 }; 1776 1777 enum netdev_reg_state { 1778 NETREG_UNINITIALIZED = 0, 1779 NETREG_REGISTERED, /* completed register_netdevice */ 1780 NETREG_UNREGISTERING, /* called unregister_netdevice */ 1781 NETREG_UNREGISTERED, /* completed unregister todo */ 1782 NETREG_RELEASED, /* called free_netdev */ 1783 NETREG_DUMMY, /* dummy device for NAPI poll */ 1784 }; 1785 1786 /** 1787 * struct net_device - The DEVICE structure. 1788 * 1789 * Actually, this whole structure is a big mistake. It mixes I/O 1790 * data with strictly "high-level" data, and it has to know about 1791 * almost every data structure used in the INET module. 1792 * 1793 * @priv_flags: flags invisible to userspace defined as bits, see 1794 * enum netdev_priv_flags for the definitions 1795 * @lltx: device supports lockless Tx. Deprecated for real HW 1796 * drivers. Mainly used by logical interfaces, such as 1797 * bonding and tunnels 1798 * @netmem_tx: device support netmem_tx. 1799 * 1800 * @name: This is the first field of the "visible" part of this structure 1801 * (i.e. as seen by users in the "Space.c" file). It is the name 1802 * of the interface. 1803 * 1804 * @name_node: Name hashlist node 1805 * @ifalias: SNMP alias 1806 * @mem_end: Shared memory end 1807 * @mem_start: Shared memory start 1808 * @base_addr: Device I/O address 1809 * @irq: Device IRQ number 1810 * 1811 * @state: Generic network queuing layer state, see netdev_state_t 1812 * @dev_list: The global list of network devices 1813 * @napi_list: List entry used for polling NAPI devices 1814 * @unreg_list: List entry when we are unregistering the 1815 * device; see the function unregister_netdev 1816 * @close_list: List entry used when we are closing the device 1817 * @ptype_all: Device-specific packet handlers for all protocols 1818 * @ptype_specific: Device-specific, protocol-specific packet handlers 1819 * 1820 * @adj_list: Directly linked devices, like slaves for bonding 1821 * @features: Currently active device features 1822 * @hw_features: User-changeable features 1823 * 1824 * @wanted_features: User-requested features 1825 * @vlan_features: Mask of features inheritable by VLAN devices 1826 * 1827 * @hw_enc_features: Mask of features inherited by encapsulating devices 1828 * This field indicates what encapsulation 1829 * offloads the hardware is capable of doing, 1830 * and drivers will need to set them appropriately. 1831 * 1832 * @mpls_features: Mask of features inheritable by MPLS 1833 * @gso_partial_features: value(s) from NETIF_F_GSO\* 1834 * @mangleid_features: Mask of features requiring MANGLEID, will be 1835 * disabled together with the latter. 1836 * 1837 * @ifindex: interface index 1838 * @group: The group the device belongs to 1839 * 1840 * @stats: Statistics struct, which was left as a legacy, use 1841 * rtnl_link_stats64 instead 1842 * 1843 * @core_stats: core networking counters, 1844 * do not use this in drivers 1845 * @carrier_up_count: Number of times the carrier has been up 1846 * @carrier_down_count: Number of times the carrier has been down 1847 * 1848 * @wireless_handlers: List of functions to handle Wireless Extensions, 1849 * instead of ioctl, 1850 * see <net/iw_handler.h> for details. 1851 * 1852 * @netdev_ops: Includes several pointers to callbacks, 1853 * if one wants to override the ndo_*() functions 1854 * @xdp_metadata_ops: Includes pointers to XDP metadata callbacks. 1855 * @xsk_tx_metadata_ops: Includes pointers to AF_XDP TX metadata callbacks. 1856 * @ethtool_ops: Management operations 1857 * @l3mdev_ops: Layer 3 master device operations 1858 * @ndisc_ops: Includes callbacks for different IPv6 neighbour 1859 * discovery handling. Necessary for e.g. 6LoWPAN. 1860 * @xfrmdev_ops: Transformation offload operations 1861 * @tlsdev_ops: Transport Layer Security offload operations 1862 * @header_ops: Includes callbacks for creating,parsing,caching,etc 1863 * of Layer 2 headers. 1864 * 1865 * @flags: Interface flags (a la BSD) 1866 * @xdp_features: XDP capability supported by the device 1867 * @gflags: Global flags ( kept as legacy ) 1868 * @priv_len: Size of the ->priv flexible array 1869 * @priv: Flexible array containing private data 1870 * @operstate: RFC2863 operstate 1871 * @link_mode: Mapping policy to operstate 1872 * @if_port: Selectable AUI, TP, ... 1873 * @dma: DMA channel 1874 * @mtu: Interface MTU value 1875 * @min_mtu: Interface Minimum MTU value 1876 * @max_mtu: Interface Maximum MTU value 1877 * @type: Interface hardware type 1878 * @hard_header_len: Maximum hardware header length. 1879 * @min_header_len: Minimum hardware header length 1880 * 1881 * @needed_headroom: Extra headroom the hardware may need, but not in all 1882 * cases can this be guaranteed 1883 * @needed_tailroom: Extra tailroom the hardware may need, but not in all 1884 * cases can this be guaranteed. Some cases also use 1885 * LL_MAX_HEADER instead to allocate the skb 1886 * 1887 * interface address info: 1888 * 1889 * @perm_addr: Permanent hw address 1890 * @addr_assign_type: Hw address assignment type 1891 * @addr_len: Hardware address length 1892 * @upper_level: Maximum depth level of upper devices. 1893 * @lower_level: Maximum depth level of lower devices. 1894 * @threaded: napi threaded state. 1895 * @neigh_priv_len: Used in neigh_alloc() 1896 * @dev_id: Used to differentiate devices that share 1897 * the same link layer address 1898 * @dev_port: Used to differentiate devices that share 1899 * the same function 1900 * @addr_list_lock: XXX: need comments on this one 1901 * @name_assign_type: network interface name assignment type 1902 * @uc_promisc: Counter that indicates promiscuous mode 1903 * has been enabled due to the need to listen to 1904 * additional unicast addresses in a device that 1905 * does not implement ndo_set_rx_mode() 1906 * @uc: unicast mac addresses 1907 * @mc: multicast mac addresses 1908 * @dev_addrs: list of device hw addresses 1909 * @queues_kset: Group of all Kobjects in the Tx and RX queues 1910 * @promiscuity: Number of times the NIC is told to work in 1911 * promiscuous mode; if it becomes 0 the NIC will 1912 * exit promiscuous mode 1913 * @allmulti: Counter, enables or disables allmulticast mode 1914 * 1915 * @vlan_info: VLAN info 1916 * @dsa_ptr: dsa specific data 1917 * @tipc_ptr: TIPC specific data 1918 * @atalk_ptr: AppleTalk link 1919 * @ip_ptr: IPv4 specific data 1920 * @ip6_ptr: IPv6 specific data 1921 * @ax25_ptr: AX.25 specific data 1922 * @ieee80211_ptr: IEEE 802.11 specific data, assign before registering 1923 * @ieee802154_ptr: IEEE 802.15.4 low-rate Wireless Personal Area Network 1924 * device struct 1925 * @mpls_ptr: mpls_dev struct pointer 1926 * @mctp_ptr: MCTP specific data 1927 * @psp_dev: PSP crypto device registered for this netdev 1928 * 1929 * @dev_addr: Hw address (before bcast, 1930 * because most packets are unicast) 1931 * 1932 * @_rx: Array of RX queues 1933 * @num_rx_queues: Number of RX queues 1934 * allocated at register_netdev() time 1935 * @real_num_rx_queues: Number of RX queues currently active in device 1936 * @xdp_prog: XDP sockets filter program pointer 1937 * 1938 * @rx_handler: handler for received packets 1939 * @rx_handler_data: XXX: need comments on this one 1940 * @tcx_ingress: BPF & clsact qdisc specific data for ingress processing 1941 * @ingress_queue: XXX: need comments on this one 1942 * @nf_hooks_ingress: netfilter hooks executed for ingress packets 1943 * @broadcast: hw bcast address 1944 * 1945 * @rx_cpu_rmap: CPU reverse-mapping for RX completion interrupts, 1946 * indexed by RX queue number. Assigned by driver. 1947 * This must only be set if the ndo_rx_flow_steer 1948 * operation is defined 1949 * @index_hlist: Device index hash chain 1950 * 1951 * @_tx: Array of TX queues 1952 * @num_tx_queues: Number of TX queues allocated at alloc_netdev_mq() time 1953 * @real_num_tx_queues: Number of TX queues currently active in device 1954 * @qdisc: Root qdisc from userspace point of view 1955 * @tx_queue_len: Max frames per queue allowed 1956 * @tx_global_lock: XXX: need comments on this one 1957 * @xdp_bulkq: XDP device bulk queue 1958 * @xps_maps: all CPUs/RXQs maps for XPS device 1959 * 1960 * @xps_maps: XXX: need comments on this one 1961 * @tcx_egress: BPF & clsact qdisc specific data for egress processing 1962 * @nf_hooks_egress: netfilter hooks executed for egress packets 1963 * @qdisc_hash: qdisc hash table 1964 * @watchdog_timeo: Represents the timeout that is used by 1965 * the watchdog (see dev_watchdog()) 1966 * @watchdog_timer: List of timers 1967 * 1968 * @proto_down_reason: reason a netdev interface is held down 1969 * @pcpu_refcnt: Number of references to this device 1970 * @dev_refcnt: Number of references to this device 1971 * @refcnt_tracker: Tracker directory for tracked references to this device 1972 * @todo_list: Delayed register/unregister 1973 * @link_watch_list: XXX: need comments on this one 1974 * 1975 * @reg_state: Register/unregister state machine 1976 * @dismantle: Device is going to be freed 1977 * @needs_free_netdev: Should unregister perform free_netdev? 1978 * @priv_destructor: Called from unregister 1979 * @npinfo: XXX: need comments on this one 1980 * @nd_net: Network namespace this network device is inside 1981 * protected by @lock 1982 * 1983 * @ml_priv: Mid-layer private 1984 * @ml_priv_type: Mid-layer private type 1985 * 1986 * @pcpu_stat_type: Type of device statistics which the core should 1987 * allocate/free: none, lstats, tstats, dstats. none 1988 * means the driver is handling statistics allocation/ 1989 * freeing internally. 1990 * @lstats: Loopback statistics: packets, bytes 1991 * @tstats: Tunnel statistics: RX/TX packets, RX/TX bytes 1992 * @dstats: Dummy statistics: RX/TX/drop packets, RX/TX bytes 1993 * 1994 * @garp_port: GARP 1995 * @mrp_port: MRP 1996 * 1997 * @dm_private: Drop monitor private 1998 * 1999 * @dev: Class/net/name entry 2000 * @sysfs_groups: Space for optional device, statistics and wireless 2001 * sysfs groups 2002 * 2003 * @sysfs_rx_queue_group: Space for optional per-rx queue attributes 2004 * @rtnl_link_ops: Rtnl_link_ops 2005 * @stat_ops: Optional ops for queue-aware statistics 2006 * @queue_mgmt_ops: Optional ops for queue management 2007 * 2008 * @gso_max_size: Maximum size of generic segmentation offload 2009 * @tso_max_size: Device (as in HW) limit on the max TSO request size 2010 * @gso_max_segs: Maximum number of segments that can be passed to the 2011 * NIC for GSO 2012 * @tso_max_segs: Device (as in HW) limit on the max TSO segment count 2013 * @gso_ipv4_max_size: Maximum size of generic segmentation offload, 2014 * for IPv4. 2015 * 2016 * @dcbnl_ops: Data Center Bridging netlink ops 2017 * @num_tc: Number of traffic classes in the net device 2018 * @tc_to_txq: XXX: need comments on this one 2019 * @prio_tc_map: XXX: need comments on this one 2020 * 2021 * @fcoe_ddp_xid: Max exchange id for FCoE LRO by ddp 2022 * 2023 * @priomap: XXX: need comments on this one 2024 * @link_topo: Physical link topology tracking attached PHYs 2025 * @phydev: Physical device may attach itself 2026 * for hardware timestamping 2027 * @sfp_bus: attached &struct sfp_bus structure. 2028 * 2029 * @qdisc_tx_busylock: lockdep class annotating Qdisc->busylock spinlock 2030 * 2031 * @proto_down: protocol port state information can be sent to the 2032 * switch driver and used to set the phys state of the 2033 * switch port. 2034 * 2035 * @irq_affinity_auto: driver wants the core to store and re-assign the IRQ 2036 * affinity. Set by netif_enable_irq_affinity(), then 2037 * the driver must create a persistent napi by 2038 * netif_napi_add_config() and finally bind the napi to 2039 * IRQ (via netif_napi_set_irq()). 2040 * 2041 * @rx_cpu_rmap_auto: driver wants the core to manage the ARFS rmap. 2042 * Set by calling netif_enable_cpu_rmap(). 2043 * 2044 * @see_all_hwtstamp_requests: device wants to see calls to 2045 * ndo_hwtstamp_set() for all timestamp requests 2046 * regardless of source, even if those aren't 2047 * HWTSTAMP_SOURCE_NETDEV 2048 * @change_proto_down: device supports setting carrier via IFLA_PROTO_DOWN 2049 * @netns_immutable: interface can't change network namespaces 2050 * @fcoe_mtu: device supports maximum FCoE MTU, 2158 bytes 2051 * 2052 * @net_notifier_list: List of per-net netdev notifier block 2053 * that follow this device when it is moved 2054 * to another network namespace. 2055 * 2056 * @macsec_ops: MACsec offloading ops 2057 * 2058 * @udp_tunnel_nic_info: static structure describing the UDP tunnel 2059 * offload capabilities of the device 2060 * @udp_tunnel_nic: UDP tunnel offload state 2061 * @ethtool: ethtool related state 2062 * @xdp_state: stores info on attached XDP BPF programs 2063 * 2064 * @nested_level: Used as a parameter of spin_lock_nested() of 2065 * dev->addr_list_lock. 2066 * @unlink_list: As netif_addr_lock() can be called recursively, 2067 * keep a list of interfaces to be deleted. 2068 * @gro_max_size: Maximum size of aggregated packet in generic 2069 * receive offload (GRO) 2070 * @gro_ipv4_max_size: Maximum size of aggregated packet in generic 2071 * receive offload (GRO), for IPv4. 2072 * @xdp_zc_max_segs: Maximum number of segments supported by AF_XDP 2073 * zero copy driver 2074 * 2075 * @dev_addr_shadow: Copy of @dev_addr to catch direct writes. 2076 * @linkwatch_dev_tracker: refcount tracker used by linkwatch. 2077 * @watchdog_dev_tracker: refcount tracker used by watchdog. 2078 * @dev_registered_tracker: tracker for reference held while 2079 * registered 2080 * @offload_xstats_l3: L3 HW stats for this netdevice. 2081 * 2082 * @devlink_port: Pointer to related devlink port structure. 2083 * Assigned by a driver before netdev registration using 2084 * SET_NETDEV_DEVLINK_PORT macro. This pointer is static 2085 * during the time netdevice is registered. 2086 * 2087 * @dpll_pin: Pointer to the SyncE source pin of a DPLL subsystem, 2088 * where the clock is recovered. 2089 * 2090 * @max_pacing_offload_horizon: max EDT offload horizon in nsec. 2091 * @napi_config: An array of napi_config structures containing per-NAPI 2092 * settings. 2093 * @num_napi_configs: number of allocated NAPI config structs, 2094 * always >= max(num_rx_queues, num_tx_queues). 2095 * @gro_flush_timeout: timeout for GRO layer in NAPI 2096 * @napi_defer_hard_irqs: If not zero, provides a counter that would 2097 * allow to avoid NIC hard IRQ, on busy queues. 2098 * 2099 * @neighbours: List heads pointing to this device's neighbours' 2100 * dev_list, one per address-family. 2101 * @hwprov: Tracks which PTP performs hardware packet time stamping. 2102 * 2103 * FIXME: cleanup struct net_device such that network protocol info 2104 * moves out. 2105 */ 2106 2107 struct net_device { 2108 /* Cacheline organization can be found documented in 2109 * Documentation/networking/net_cachelines/net_device.rst. 2110 * Please update the document when adding new fields. 2111 */ 2112 2113 /* TX read-mostly hotpath */ 2114 __cacheline_group_begin(net_device_read_tx); 2115 struct_group(priv_flags_fast, 2116 unsigned long priv_flags:32; 2117 unsigned long lltx:1; 2118 unsigned long netmem_tx:1; 2119 ); 2120 const struct net_device_ops *netdev_ops; 2121 const struct header_ops *header_ops; 2122 struct netdev_queue *_tx; 2123 netdev_features_t gso_partial_features; 2124 unsigned int real_num_tx_queues; 2125 unsigned int gso_max_size; 2126 unsigned int gso_ipv4_max_size; 2127 u16 gso_max_segs; 2128 s16 num_tc; 2129 /* Note : dev->mtu is often read without holding a lock. 2130 * Writers usually hold RTNL. 2131 * It is recommended to use READ_ONCE() to annotate the reads, 2132 * and to use WRITE_ONCE() to annotate the writes. 2133 */ 2134 unsigned int mtu; 2135 unsigned short needed_headroom; 2136 struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE]; 2137 #ifdef CONFIG_XPS 2138 struct xps_dev_maps __rcu *xps_maps[XPS_MAPS_MAX]; 2139 #endif 2140 #ifdef CONFIG_NETFILTER_EGRESS 2141 struct nf_hook_entries __rcu *nf_hooks_egress; 2142 #endif 2143 #ifdef CONFIG_NET_XGRESS 2144 struct bpf_mprog_entry __rcu *tcx_egress; 2145 #endif 2146 __cacheline_group_end(net_device_read_tx); 2147 2148 /* TXRX read-mostly hotpath */ 2149 __cacheline_group_begin(net_device_read_txrx); 2150 union { 2151 struct pcpu_lstats __percpu *lstats; 2152 struct pcpu_sw_netstats __percpu *tstats; 2153 struct pcpu_dstats __percpu *dstats; 2154 }; 2155 unsigned long state; 2156 unsigned int flags; 2157 unsigned short hard_header_len; 2158 enum netdev_stat_type pcpu_stat_type:8; 2159 netdev_features_t features; 2160 struct inet6_dev __rcu *ip6_ptr; 2161 __cacheline_group_end(net_device_read_txrx); 2162 2163 /* RX read-mostly hotpath */ 2164 __cacheline_group_begin(net_device_read_rx); 2165 struct bpf_prog __rcu *xdp_prog; 2166 struct list_head ptype_specific; 2167 int ifindex; 2168 unsigned int real_num_rx_queues; 2169 struct netdev_rx_queue *_rx; 2170 unsigned int gro_max_size; 2171 unsigned int gro_ipv4_max_size; 2172 rx_handler_func_t __rcu *rx_handler; 2173 void __rcu *rx_handler_data; 2174 possible_net_t nd_net; 2175 #ifdef CONFIG_NETPOLL 2176 struct netpoll_info __rcu *npinfo; 2177 #endif 2178 #ifdef CONFIG_NET_XGRESS 2179 struct bpf_mprog_entry __rcu *tcx_ingress; 2180 #endif 2181 __cacheline_group_end(net_device_read_rx); 2182 2183 char name[IFNAMSIZ]; 2184 struct netdev_name_node *name_node; 2185 struct dev_ifalias __rcu *ifalias; 2186 /* 2187 * I/O specific fields 2188 * FIXME: Merge these and struct ifmap into one 2189 */ 2190 unsigned long mem_end; 2191 unsigned long mem_start; 2192 unsigned long base_addr; 2193 2194 /* 2195 * Some hardware also needs these fields (state,dev_list, 2196 * napi_list,unreg_list,close_list) but they are not 2197 * part of the usual set specified in Space.c. 2198 */ 2199 2200 2201 struct list_head dev_list; 2202 struct list_head napi_list; 2203 struct list_head unreg_list; 2204 struct list_head close_list; 2205 struct list_head ptype_all; 2206 2207 struct { 2208 struct list_head upper; 2209 struct list_head lower; 2210 } adj_list; 2211 2212 /* Read-mostly cache-line for fast-path access */ 2213 xdp_features_t xdp_features; 2214 const struct xdp_metadata_ops *xdp_metadata_ops; 2215 const struct xsk_tx_metadata_ops *xsk_tx_metadata_ops; 2216 unsigned short gflags; 2217 2218 unsigned short needed_tailroom; 2219 2220 netdev_features_t hw_features; 2221 netdev_features_t wanted_features; 2222 netdev_features_t vlan_features; 2223 netdev_features_t hw_enc_features; 2224 netdev_features_t mpls_features; 2225 netdev_features_t mangleid_features; 2226 2227 unsigned int min_mtu; 2228 unsigned int max_mtu; 2229 unsigned short type; 2230 unsigned char min_header_len; 2231 unsigned char name_assign_type; 2232 2233 int group; 2234 2235 struct net_device_stats stats; /* not used by modern drivers */ 2236 2237 struct net_device_core_stats __percpu *core_stats; 2238 2239 /* Stats to monitor link on/off, flapping */ 2240 atomic_t carrier_up_count; 2241 atomic_t carrier_down_count; 2242 2243 #ifdef CONFIG_WIRELESS_EXT 2244 const struct iw_handler_def *wireless_handlers; 2245 #endif 2246 const struct ethtool_ops *ethtool_ops; 2247 #ifdef CONFIG_NET_L3_MASTER_DEV 2248 const struct l3mdev_ops *l3mdev_ops; 2249 #endif 2250 #if IS_ENABLED(CONFIG_IPV6) 2251 const struct ndisc_ops *ndisc_ops; 2252 #endif 2253 2254 #ifdef CONFIG_XFRM_OFFLOAD 2255 const struct xfrmdev_ops *xfrmdev_ops; 2256 #endif 2257 2258 #if IS_ENABLED(CONFIG_TLS_DEVICE) 2259 const struct tlsdev_ops *tlsdev_ops; 2260 #endif 2261 2262 unsigned int operstate; 2263 unsigned char link_mode; 2264 2265 unsigned char if_port; 2266 unsigned char dma; 2267 2268 /* Interface address info. */ 2269 unsigned char perm_addr[MAX_ADDR_LEN]; 2270 unsigned char addr_assign_type; 2271 unsigned char addr_len; 2272 unsigned char upper_level; 2273 unsigned char lower_level; 2274 u8 threaded; 2275 2276 unsigned short neigh_priv_len; 2277 unsigned short dev_id; 2278 unsigned short dev_port; 2279 int irq; 2280 u32 priv_len; 2281 2282 spinlock_t addr_list_lock; 2283 2284 struct netdev_hw_addr_list uc; 2285 struct netdev_hw_addr_list mc; 2286 struct netdev_hw_addr_list dev_addrs; 2287 2288 #ifdef CONFIG_SYSFS 2289 struct kset *queues_kset; 2290 #endif 2291 #ifdef CONFIG_LOCKDEP 2292 struct list_head unlink_list; 2293 #endif 2294 unsigned int promiscuity; 2295 unsigned int allmulti; 2296 bool uc_promisc; 2297 #ifdef CONFIG_LOCKDEP 2298 unsigned char nested_level; 2299 #endif 2300 2301 2302 /* Protocol-specific pointers */ 2303 struct in_device __rcu *ip_ptr; 2304 /** @fib_nh_head: nexthops associated with this netdev */ 2305 struct hlist_head fib_nh_head; 2306 2307 #if IS_ENABLED(CONFIG_VLAN_8021Q) 2308 struct vlan_info __rcu *vlan_info; 2309 #endif 2310 #if IS_ENABLED(CONFIG_NET_DSA) 2311 struct dsa_port *dsa_ptr; 2312 #endif 2313 #if IS_ENABLED(CONFIG_TIPC) 2314 struct tipc_bearer __rcu *tipc_ptr; 2315 #endif 2316 #if IS_ENABLED(CONFIG_ATALK) 2317 void *atalk_ptr; 2318 #endif 2319 #if IS_ENABLED(CONFIG_AX25) 2320 struct ax25_dev __rcu *ax25_ptr; 2321 #endif 2322 #if IS_ENABLED(CONFIG_CFG80211) 2323 struct wireless_dev *ieee80211_ptr; 2324 #endif 2325 #if IS_ENABLED(CONFIG_IEEE802154) || IS_ENABLED(CONFIG_6LOWPAN) 2326 struct wpan_dev *ieee802154_ptr; 2327 #endif 2328 #if IS_ENABLED(CONFIG_MPLS_ROUTING) 2329 struct mpls_dev __rcu *mpls_ptr; 2330 #endif 2331 #if IS_ENABLED(CONFIG_MCTP) 2332 struct mctp_dev __rcu *mctp_ptr; 2333 #endif 2334 #if IS_ENABLED(CONFIG_INET_PSP) 2335 struct psp_dev __rcu *psp_dev; 2336 #endif 2337 2338 /* 2339 * Cache lines mostly used on receive path (including eth_type_trans()) 2340 */ 2341 /* Interface address info used in eth_type_trans() */ 2342 const unsigned char *dev_addr; 2343 2344 unsigned int num_rx_queues; 2345 #define GRO_LEGACY_MAX_SIZE 65536u 2346 /* TCP minimal MSS is 8 (TCP_MIN_GSO_SIZE), 2347 * and shinfo->gso_segs is a 16bit field. 2348 */ 2349 #define GRO_MAX_SIZE (8 * 65535u) 2350 unsigned int xdp_zc_max_segs; 2351 struct netdev_queue __rcu *ingress_queue; 2352 #ifdef CONFIG_NETFILTER_INGRESS 2353 struct nf_hook_entries __rcu *nf_hooks_ingress; 2354 #endif 2355 2356 unsigned char broadcast[MAX_ADDR_LEN]; 2357 #ifdef CONFIG_RFS_ACCEL 2358 struct cpu_rmap *rx_cpu_rmap; 2359 #endif 2360 struct hlist_node index_hlist; 2361 2362 /* 2363 * Cache lines mostly used on transmit path 2364 */ 2365 unsigned int num_tx_queues; 2366 struct Qdisc __rcu *qdisc; 2367 unsigned int tx_queue_len; 2368 spinlock_t tx_global_lock; 2369 2370 struct xdp_dev_bulk_queue __percpu *xdp_bulkq; 2371 2372 #ifdef CONFIG_NET_SCHED 2373 DECLARE_HASHTABLE (qdisc_hash, 4); 2374 #endif 2375 /* These may be needed for future network-power-down code. */ 2376 struct timer_list watchdog_timer; 2377 int watchdog_timeo; 2378 2379 u32 proto_down_reason; 2380 2381 struct list_head todo_list; 2382 2383 #ifdef CONFIG_PCPU_DEV_REFCNT 2384 int __percpu *pcpu_refcnt; 2385 #else 2386 refcount_t dev_refcnt; 2387 #endif 2388 struct ref_tracker_dir refcnt_tracker; 2389 2390 struct list_head link_watch_list; 2391 2392 u8 reg_state; 2393 2394 bool dismantle; 2395 2396 /** @moving_ns: device is changing netns, protected by @lock */ 2397 bool moving_ns; 2398 /** @rtnl_link_initializing: Device being created, suppress events */ 2399 bool rtnl_link_initializing; 2400 2401 bool needs_free_netdev; 2402 void (*priv_destructor)(struct net_device *dev); 2403 2404 /* mid-layer private */ 2405 void *ml_priv; 2406 enum netdev_ml_priv_type ml_priv_type; 2407 2408 #if IS_ENABLED(CONFIG_GARP) 2409 struct garp_port __rcu *garp_port; 2410 #endif 2411 #if IS_ENABLED(CONFIG_MRP) 2412 struct mrp_port __rcu *mrp_port; 2413 #endif 2414 #if IS_ENABLED(CONFIG_NET_DROP_MONITOR) 2415 struct dm_hw_stat_delta __rcu *dm_private; 2416 #endif 2417 struct device dev; 2418 const struct attribute_group *sysfs_groups[5]; 2419 const struct attribute_group *sysfs_rx_queue_group; 2420 2421 const struct rtnl_link_ops *rtnl_link_ops; 2422 2423 const struct netdev_stat_ops *stat_ops; 2424 2425 const struct netdev_queue_mgmt_ops *queue_mgmt_ops; 2426 2427 /* for setting kernel sock attribute on TCP connection setup */ 2428 #define GSO_MAX_SEGS 65535u 2429 #define GSO_LEGACY_MAX_SIZE 65536u 2430 /* TCP minimal MSS is 8 (TCP_MIN_GSO_SIZE), 2431 * and shinfo->gso_segs is a 16bit field. 2432 */ 2433 #define GSO_MAX_SIZE (8 * GSO_MAX_SEGS) 2434 2435 #define TSO_LEGACY_MAX_SIZE 65536 2436 #define TSO_MAX_SIZE UINT_MAX 2437 unsigned int tso_max_size; 2438 #define TSO_MAX_SEGS U16_MAX 2439 u16 tso_max_segs; 2440 2441 #ifdef CONFIG_DCB 2442 const struct dcbnl_rtnl_ops *dcbnl_ops; 2443 #endif 2444 u8 prio_tc_map[TC_BITMASK + 1]; 2445 2446 #if IS_ENABLED(CONFIG_FCOE) 2447 unsigned int fcoe_ddp_xid; 2448 #endif 2449 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) 2450 struct netprio_map __rcu *priomap; 2451 #endif 2452 struct phy_link_topology *link_topo; 2453 struct phy_device *phydev; 2454 struct sfp_bus *sfp_bus; 2455 struct lock_class_key *qdisc_tx_busylock; 2456 bool proto_down; 2457 bool irq_affinity_auto; 2458 bool rx_cpu_rmap_auto; 2459 2460 /* priv_flags_slow, ungrouped to save space */ 2461 unsigned long see_all_hwtstamp_requests:1; 2462 unsigned long change_proto_down:1; 2463 unsigned long netns_immutable:1; 2464 unsigned long fcoe_mtu:1; 2465 2466 struct list_head net_notifier_list; 2467 2468 #if IS_ENABLED(CONFIG_MACSEC) 2469 /* MACsec management functions */ 2470 const struct macsec_ops *macsec_ops; 2471 #endif 2472 const struct udp_tunnel_nic_info *udp_tunnel_nic_info; 2473 struct udp_tunnel_nic *udp_tunnel_nic; 2474 2475 /** @cfg: net_device queue-related configuration */ 2476 struct netdev_config *cfg; 2477 /** 2478 * @cfg_pending: same as @cfg but when device is being actively 2479 * reconfigured includes any changes to the configuration 2480 * requested by the user, but which may or may not be rejected. 2481 */ 2482 struct netdev_config *cfg_pending; 2483 struct ethtool_netdev_state *ethtool; 2484 2485 /* protected by rtnl_lock */ 2486 struct bpf_xdp_entity xdp_state[__MAX_XDP_MODE]; 2487 2488 u8 dev_addr_shadow[MAX_ADDR_LEN]; 2489 netdevice_tracker linkwatch_dev_tracker; 2490 netdevice_tracker watchdog_dev_tracker; 2491 netdevice_tracker dev_registered_tracker; 2492 struct rtnl_hw_stats64 *offload_xstats_l3; 2493 2494 struct devlink_port *devlink_port; 2495 2496 #if IS_ENABLED(CONFIG_DPLL) 2497 struct dpll_pin __rcu *dpll_pin; 2498 #endif 2499 #if IS_ENABLED(CONFIG_PAGE_POOL) 2500 /** @page_pools: page pools created for this netdevice */ 2501 struct hlist_head page_pools; 2502 #endif 2503 2504 /** @irq_moder: dim parameters used if IS_ENABLED(CONFIG_DIMLIB). */ 2505 struct dim_irq_moder *irq_moder; 2506 2507 u64 max_pacing_offload_horizon; 2508 struct napi_config *napi_config; 2509 u32 num_napi_configs; 2510 u32 napi_defer_hard_irqs; 2511 unsigned long gro_flush_timeout; 2512 2513 /** 2514 * @up: copy of @state's IFF_UP, but safe to read with just @lock. 2515 * May report false negatives while the device is being opened 2516 * or closed (@lock does not protect .ndo_open, or .ndo_close). 2517 */ 2518 bool up; 2519 2520 /** 2521 * @request_ops_lock: request the core to run all @netdev_ops and 2522 * @ethtool_ops under the @lock. 2523 */ 2524 bool request_ops_lock; 2525 2526 /** 2527 * @lock: netdev-scope lock, protects a small selection of fields. 2528 * Should always be taken using netdev_lock() / netdev_unlock() helpers. 2529 * Drivers are free to use it for other protection. 2530 * 2531 * For the drivers that implement shaper or queue API, the scope 2532 * of this lock is expanded to cover most ndo/queue/ethtool/sysfs 2533 * operations. Drivers may opt-in to this behavior by setting 2534 * @request_ops_lock. 2535 * 2536 * @lock protection mixes with rtnl_lock in multiple ways, fields are 2537 * either: 2538 * 2539 * - simply protected by the instance @lock; 2540 * 2541 * - double protected - writers hold both locks, readers hold either; 2542 * 2543 * - ops protected - protected by the lock held around the NDOs 2544 * and other callbacks, that is the instance lock on devices for 2545 * which netdev_need_ops_lock() returns true, otherwise by rtnl_lock; 2546 * 2547 * - double ops protected - always protected by rtnl_lock but for 2548 * devices for which netdev_need_ops_lock() returns true - also 2549 * the instance lock. 2550 * 2551 * Simply protects: 2552 * @gro_flush_timeout, @napi_defer_hard_irqs, @napi_list, 2553 * @net_shaper_hierarchy, @reg_state, @threaded 2554 * 2555 * Double protects: 2556 * @up, @moving_ns, @nd_net, @xdp_features 2557 * 2558 * Double ops protects: 2559 * @real_num_rx_queues, @real_num_tx_queues 2560 * 2561 * Also protects some fields in: 2562 * struct napi_struct, struct netdev_queue, struct netdev_rx_queue 2563 * 2564 * Ordering: 2565 * 2566 * - take after rtnl_lock 2567 * 2568 * - for the case of netdev queue leasing, the netdev-scope lock is 2569 * taken for both the virtual and the physical device; to prevent 2570 * deadlocks, the virtual device's lock must always be acquired 2571 * before the physical device's (see netdev_nl_queue_create_doit) 2572 */ 2573 struct mutex lock; 2574 2575 #if IS_ENABLED(CONFIG_NET_SHAPER) 2576 /** 2577 * @net_shaper_hierarchy: data tracking the current shaper status 2578 * see include/net/net_shapers.h 2579 */ 2580 struct net_shaper_hierarchy *net_shaper_hierarchy; 2581 #endif 2582 2583 struct hlist_head neighbours[NEIGH_NR_TABLES]; 2584 2585 struct hwtstamp_provider __rcu *hwprov; 2586 2587 u8 priv[] ____cacheline_aligned 2588 __counted_by(priv_len); 2589 } ____cacheline_aligned; 2590 #define to_net_dev(d) container_of(d, struct net_device, dev) 2591 2592 /* 2593 * Driver should use this to assign devlink port instance to a netdevice 2594 * before it registers the netdevice. Therefore devlink_port is static 2595 * during the netdev lifetime after it is registered. 2596 */ 2597 #define SET_NETDEV_DEVLINK_PORT(dev, port) \ 2598 ({ \ 2599 WARN_ON((dev)->reg_state != NETREG_UNINITIALIZED); \ 2600 ((dev)->devlink_port = (port)); \ 2601 }) 2602 2603 static inline bool netif_elide_gro(const struct net_device *dev) 2604 { 2605 if (!(dev->features & NETIF_F_GRO) || dev->xdp_prog) 2606 return true; 2607 return false; 2608 } 2609 2610 #define NETDEV_ALIGN 32 2611 2612 static inline 2613 int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio) 2614 { 2615 return dev->prio_tc_map[prio & TC_BITMASK]; 2616 } 2617 2618 static inline 2619 int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc) 2620 { 2621 if (tc >= dev->num_tc) 2622 return -EINVAL; 2623 2624 dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK; 2625 return 0; 2626 } 2627 2628 int netdev_txq_to_tc(struct net_device *dev, unsigned int txq); 2629 void netdev_reset_tc(struct net_device *dev); 2630 int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset); 2631 int netdev_set_num_tc(struct net_device *dev, u8 num_tc); 2632 2633 static inline 2634 int netdev_get_num_tc(struct net_device *dev) 2635 { 2636 return dev->num_tc; 2637 } 2638 2639 static inline void net_prefetch(void *p) 2640 { 2641 prefetch(p); 2642 #if L1_CACHE_BYTES < 128 2643 prefetch((u8 *)p + L1_CACHE_BYTES); 2644 #endif 2645 } 2646 2647 static inline void net_prefetchw(void *p) 2648 { 2649 prefetchw(p); 2650 #if L1_CACHE_BYTES < 128 2651 prefetchw((u8 *)p + L1_CACHE_BYTES); 2652 #endif 2653 } 2654 2655 void netdev_unbind_sb_channel(struct net_device *dev, 2656 struct net_device *sb_dev); 2657 int netdev_bind_sb_channel_queue(struct net_device *dev, 2658 struct net_device *sb_dev, 2659 u8 tc, u16 count, u16 offset); 2660 int netdev_set_sb_channel(struct net_device *dev, u16 channel); 2661 static inline int netdev_get_sb_channel(struct net_device *dev) 2662 { 2663 return max_t(int, -dev->num_tc, 0); 2664 } 2665 2666 static inline 2667 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev, 2668 unsigned int index) 2669 { 2670 DEBUG_NET_WARN_ON_ONCE(index >= dev->num_tx_queues); 2671 return &dev->_tx[index]; 2672 } 2673 2674 static inline struct netdev_queue *skb_get_tx_queue(const struct net_device *dev, 2675 const struct sk_buff *skb) 2676 { 2677 return netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); 2678 } 2679 2680 static inline void netdev_for_each_tx_queue(struct net_device *dev, 2681 void (*f)(struct net_device *, 2682 struct netdev_queue *, 2683 void *), 2684 void *arg) 2685 { 2686 unsigned int i; 2687 2688 for (i = 0; i < dev->num_tx_queues; i++) 2689 f(dev, &dev->_tx[i], arg); 2690 } 2691 2692 u16 netdev_pick_tx(struct net_device *dev, struct sk_buff *skb, 2693 struct net_device *sb_dev); 2694 struct netdev_queue *netdev_core_pick_tx(struct net_device *dev, 2695 struct sk_buff *skb, 2696 struct net_device *sb_dev); 2697 2698 /* returns the headroom that the master device needs to take in account 2699 * when forwarding to this dev 2700 */ 2701 static inline unsigned netdev_get_fwd_headroom(struct net_device *dev) 2702 { 2703 return dev->priv_flags & IFF_PHONY_HEADROOM ? 0 : dev->needed_headroom; 2704 } 2705 2706 static inline void netdev_set_rx_headroom(struct net_device *dev, int new_hr) 2707 { 2708 if (dev->netdev_ops->ndo_set_rx_headroom) 2709 dev->netdev_ops->ndo_set_rx_headroom(dev, new_hr); 2710 } 2711 2712 /* set the device rx headroom to the dev's default */ 2713 static inline void netdev_reset_rx_headroom(struct net_device *dev) 2714 { 2715 netdev_set_rx_headroom(dev, -1); 2716 } 2717 2718 static inline void *netdev_get_ml_priv(struct net_device *dev, 2719 enum netdev_ml_priv_type type) 2720 { 2721 if (dev->ml_priv_type != type) 2722 return NULL; 2723 2724 return dev->ml_priv; 2725 } 2726 2727 static inline void netdev_set_ml_priv(struct net_device *dev, 2728 void *ml_priv, 2729 enum netdev_ml_priv_type type) 2730 { 2731 WARN(dev->ml_priv_type && dev->ml_priv_type != type, 2732 "Overwriting already set ml_priv_type (%u) with different ml_priv_type (%u)!\n", 2733 dev->ml_priv_type, type); 2734 WARN(!dev->ml_priv_type && dev->ml_priv, 2735 "Overwriting already set ml_priv and ml_priv_type is ML_PRIV_NONE!\n"); 2736 2737 dev->ml_priv = ml_priv; 2738 dev->ml_priv_type = type; 2739 } 2740 2741 /* 2742 * Net namespace inlines 2743 */ 2744 static inline 2745 struct net *dev_net(const struct net_device *dev) 2746 { 2747 return read_pnet(&dev->nd_net); 2748 } 2749 2750 static inline 2751 struct net *dev_net_rcu(const struct net_device *dev) 2752 { 2753 return read_pnet_rcu(&dev->nd_net); 2754 } 2755 2756 static inline 2757 void dev_net_set(struct net_device *dev, struct net *net) 2758 { 2759 write_pnet(&dev->nd_net, net); 2760 } 2761 2762 /** 2763 * netdev_priv - access network device private data 2764 * @dev: network device 2765 * 2766 * Get network device private data 2767 */ 2768 static inline void *netdev_priv(const struct net_device *dev) 2769 { 2770 return (void *)dev->priv; 2771 } 2772 2773 /** 2774 * netdev_from_priv() - get network device from priv 2775 * @priv: network device private data 2776 * 2777 * Returns: net_device to which @priv belongs 2778 */ 2779 static inline struct net_device *netdev_from_priv(const void *priv) 2780 { 2781 return container_of(priv, struct net_device, priv); 2782 } 2783 2784 /* Set the sysfs physical device reference for the network logical device 2785 * if set prior to registration will cause a symlink during initialization. 2786 */ 2787 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) 2788 2789 /* Set the sysfs device type for the network logical device to allow 2790 * fine-grained identification of different network device types. For 2791 * example Ethernet, Wireless LAN, Bluetooth, WiMAX etc. 2792 */ 2793 #define SET_NETDEV_DEVTYPE(net, devtype) ((net)->dev.type = (devtype)) 2794 2795 void netif_queue_set_napi(struct net_device *dev, unsigned int queue_index, 2796 enum netdev_queue_type type, 2797 struct napi_struct *napi); 2798 2799 static inline void netdev_lock(struct net_device *dev) 2800 { 2801 mutex_lock(&dev->lock); 2802 } 2803 2804 static inline void netdev_unlock(struct net_device *dev) 2805 { 2806 mutex_unlock(&dev->lock); 2807 } 2808 /* Additional netdev_lock()-related helpers are in net/netdev_lock.h */ 2809 2810 void netif_napi_set_irq_locked(struct napi_struct *napi, int irq); 2811 2812 static inline void netif_napi_set_irq(struct napi_struct *napi, int irq) 2813 { 2814 netdev_lock(napi->dev); 2815 netif_napi_set_irq_locked(napi, irq); 2816 netdev_unlock(napi->dev); 2817 } 2818 2819 /* Default NAPI poll() weight 2820 * Device drivers are strongly advised to not use bigger value 2821 */ 2822 #define NAPI_POLL_WEIGHT 64 2823 2824 void netif_napi_add_weight_locked(struct net_device *dev, 2825 struct napi_struct *napi, 2826 int (*poll)(struct napi_struct *, int), 2827 int weight); 2828 2829 static inline void 2830 netif_napi_add_weight(struct net_device *dev, struct napi_struct *napi, 2831 int (*poll)(struct napi_struct *, int), int weight) 2832 { 2833 netdev_lock(dev); 2834 netif_napi_add_weight_locked(dev, napi, poll, weight); 2835 netdev_unlock(dev); 2836 } 2837 2838 /** 2839 * netif_napi_add() - initialize a NAPI context 2840 * @dev: network device 2841 * @napi: NAPI context 2842 * @poll: polling function 2843 * 2844 * netif_napi_add() must be used to initialize a NAPI context prior to calling 2845 * *any* of the other NAPI-related functions. 2846 */ 2847 static inline void 2848 netif_napi_add(struct net_device *dev, struct napi_struct *napi, 2849 int (*poll)(struct napi_struct *, int)) 2850 { 2851 netif_napi_add_weight(dev, napi, poll, NAPI_POLL_WEIGHT); 2852 } 2853 2854 static inline void 2855 netif_napi_add_locked(struct net_device *dev, struct napi_struct *napi, 2856 int (*poll)(struct napi_struct *, int)) 2857 { 2858 netif_napi_add_weight_locked(dev, napi, poll, NAPI_POLL_WEIGHT); 2859 } 2860 2861 static inline void 2862 netif_napi_add_tx_weight(struct net_device *dev, 2863 struct napi_struct *napi, 2864 int (*poll)(struct napi_struct *, int), 2865 int weight) 2866 { 2867 set_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state); 2868 netif_napi_add_weight(dev, napi, poll, weight); 2869 } 2870 2871 static inline void 2872 netif_napi_add_config_locked(struct net_device *dev, struct napi_struct *napi, 2873 int (*poll)(struct napi_struct *, int), int index) 2874 { 2875 napi->index = index; 2876 napi->config = &dev->napi_config[index]; 2877 netif_napi_add_weight_locked(dev, napi, poll, NAPI_POLL_WEIGHT); 2878 } 2879 2880 /** 2881 * netif_napi_add_config - initialize a NAPI context with persistent config 2882 * @dev: network device 2883 * @napi: NAPI context 2884 * @poll: polling function 2885 * @index: the NAPI index 2886 */ 2887 static inline void 2888 netif_napi_add_config(struct net_device *dev, struct napi_struct *napi, 2889 int (*poll)(struct napi_struct *, int), int index) 2890 { 2891 netdev_lock(dev); 2892 netif_napi_add_config_locked(dev, napi, poll, index); 2893 netdev_unlock(dev); 2894 } 2895 2896 /** 2897 * netif_napi_add_tx() - initialize a NAPI context to be used for Tx only 2898 * @dev: network device 2899 * @napi: NAPI context 2900 * @poll: polling function 2901 * 2902 * This variant of netif_napi_add() should be used from drivers using NAPI 2903 * to exclusively poll a TX queue. 2904 * This will avoid we add it into napi_hash[], thus polluting this hash table. 2905 */ 2906 static inline void netif_napi_add_tx(struct net_device *dev, 2907 struct napi_struct *napi, 2908 int (*poll)(struct napi_struct *, int)) 2909 { 2910 netif_napi_add_tx_weight(dev, napi, poll, NAPI_POLL_WEIGHT); 2911 } 2912 2913 void __netif_napi_del_locked(struct napi_struct *napi); 2914 2915 /** 2916 * __netif_napi_del - remove a NAPI context 2917 * @napi: NAPI context 2918 * 2919 * Warning: caller must observe RCU grace period before freeing memory 2920 * containing @napi. Drivers might want to call this helper to combine 2921 * all the needed RCU grace periods into a single one. 2922 */ 2923 static inline void __netif_napi_del(struct napi_struct *napi) 2924 { 2925 netdev_lock(napi->dev); 2926 __netif_napi_del_locked(napi); 2927 netdev_unlock(napi->dev); 2928 } 2929 2930 static inline void netif_napi_del_locked(struct napi_struct *napi) 2931 { 2932 __netif_napi_del_locked(napi); 2933 synchronize_net(); 2934 } 2935 2936 /** 2937 * netif_napi_del - remove a NAPI context 2938 * @napi: NAPI context 2939 * 2940 * netif_napi_del() removes a NAPI context from the network device NAPI list 2941 */ 2942 static inline void netif_napi_del(struct napi_struct *napi) 2943 { 2944 __netif_napi_del(napi); 2945 synchronize_net(); 2946 } 2947 2948 int netif_enable_cpu_rmap(struct net_device *dev, unsigned int num_irqs); 2949 void netif_set_affinity_auto(struct net_device *dev); 2950 2951 struct packet_type { 2952 __be16 type; /* This is really htons(ether_type). */ 2953 bool ignore_outgoing; 2954 struct net_device *dev; /* NULL is wildcarded here */ 2955 netdevice_tracker dev_tracker; 2956 int (*func) (struct sk_buff *, 2957 struct net_device *, 2958 struct packet_type *, 2959 struct net_device *); 2960 void (*list_func) (struct list_head *, 2961 struct packet_type *, 2962 struct net_device *); 2963 bool (*id_match)(struct packet_type *ptype, 2964 struct sock *sk); 2965 struct net *af_packet_net; 2966 void *af_packet_priv; 2967 struct list_head list; 2968 }; 2969 2970 struct offload_callbacks { 2971 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 2972 netdev_features_t features); 2973 struct sk_buff *(*gro_receive)(struct list_head *head, 2974 struct sk_buff *skb); 2975 int (*gro_complete)(struct sk_buff *skb, int nhoff); 2976 }; 2977 2978 struct packet_offload { 2979 __be16 type; /* This is really htons(ether_type). */ 2980 u16 priority; 2981 struct offload_callbacks callbacks; 2982 struct list_head list; 2983 }; 2984 2985 /* often modified stats are per-CPU, other are shared (netdev->stats) */ 2986 struct pcpu_sw_netstats { 2987 u64_stats_t rx_packets; 2988 u64_stats_t rx_bytes; 2989 u64_stats_t tx_packets; 2990 u64_stats_t tx_bytes; 2991 struct u64_stats_sync syncp; 2992 } __aligned(4 * sizeof(u64)); 2993 2994 struct pcpu_dstats { 2995 u64_stats_t rx_packets; 2996 u64_stats_t rx_bytes; 2997 u64_stats_t tx_packets; 2998 u64_stats_t tx_bytes; 2999 u64_stats_t rx_drops; 3000 u64_stats_t tx_drops; 3001 struct u64_stats_sync syncp; 3002 } __aligned(8 * sizeof(u64)); 3003 3004 struct pcpu_lstats { 3005 u64_stats_t packets; 3006 u64_stats_t bytes; 3007 struct u64_stats_sync syncp; 3008 } __aligned(2 * sizeof(u64)); 3009 3010 void dev_lstats_read(struct net_device *dev, u64 *packets, u64 *bytes); 3011 3012 static inline void dev_sw_netstats_rx_add(struct net_device *dev, unsigned int len) 3013 { 3014 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 3015 3016 u64_stats_update_begin(&tstats->syncp); 3017 u64_stats_add(&tstats->rx_bytes, len); 3018 u64_stats_inc(&tstats->rx_packets); 3019 u64_stats_update_end(&tstats->syncp); 3020 } 3021 3022 static inline void dev_sw_netstats_tx_add(struct net_device *dev, 3023 unsigned int packets, 3024 unsigned int len) 3025 { 3026 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 3027 3028 u64_stats_update_begin(&tstats->syncp); 3029 u64_stats_add(&tstats->tx_bytes, len); 3030 u64_stats_add(&tstats->tx_packets, packets); 3031 u64_stats_update_end(&tstats->syncp); 3032 } 3033 3034 static inline void dev_lstats_add(struct net_device *dev, unsigned int len) 3035 { 3036 struct pcpu_lstats *lstats = this_cpu_ptr(dev->lstats); 3037 3038 u64_stats_update_begin(&lstats->syncp); 3039 u64_stats_add(&lstats->bytes, len); 3040 u64_stats_inc(&lstats->packets); 3041 u64_stats_update_end(&lstats->syncp); 3042 } 3043 3044 static inline void dev_dstats_rx_add(struct net_device *dev, 3045 unsigned int len) 3046 { 3047 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); 3048 3049 u64_stats_update_begin(&dstats->syncp); 3050 u64_stats_inc(&dstats->rx_packets); 3051 u64_stats_add(&dstats->rx_bytes, len); 3052 u64_stats_update_end(&dstats->syncp); 3053 } 3054 3055 static inline void dev_dstats_rx_dropped(struct net_device *dev) 3056 { 3057 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); 3058 3059 u64_stats_update_begin(&dstats->syncp); 3060 u64_stats_inc(&dstats->rx_drops); 3061 u64_stats_update_end(&dstats->syncp); 3062 } 3063 3064 static inline void dev_dstats_rx_dropped_add(struct net_device *dev, 3065 unsigned int packets) 3066 { 3067 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); 3068 3069 u64_stats_update_begin(&dstats->syncp); 3070 u64_stats_add(&dstats->rx_drops, packets); 3071 u64_stats_update_end(&dstats->syncp); 3072 } 3073 3074 static inline void dev_dstats_tx_add(struct net_device *dev, 3075 unsigned int len) 3076 { 3077 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); 3078 3079 u64_stats_update_begin(&dstats->syncp); 3080 u64_stats_inc(&dstats->tx_packets); 3081 u64_stats_add(&dstats->tx_bytes, len); 3082 u64_stats_update_end(&dstats->syncp); 3083 } 3084 3085 static inline void dev_dstats_tx_dropped(struct net_device *dev) 3086 { 3087 struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); 3088 3089 u64_stats_update_begin(&dstats->syncp); 3090 u64_stats_inc(&dstats->tx_drops); 3091 u64_stats_update_end(&dstats->syncp); 3092 } 3093 3094 #define __netdev_alloc_pcpu_stats(type, gfp) \ 3095 ({ \ 3096 typeof(type) __percpu *pcpu_stats = alloc_percpu_gfp(type, gfp);\ 3097 if (pcpu_stats) { \ 3098 int __cpu; \ 3099 for_each_possible_cpu(__cpu) { \ 3100 typeof(type) *stat; \ 3101 stat = per_cpu_ptr(pcpu_stats, __cpu); \ 3102 u64_stats_init(&stat->syncp); \ 3103 } \ 3104 } \ 3105 pcpu_stats; \ 3106 }) 3107 3108 #define netdev_alloc_pcpu_stats(type) \ 3109 __netdev_alloc_pcpu_stats(type, GFP_KERNEL) 3110 3111 #define devm_netdev_alloc_pcpu_stats(dev, type) \ 3112 ({ \ 3113 typeof(type) __percpu *pcpu_stats = devm_alloc_percpu(dev, type);\ 3114 if (pcpu_stats) { \ 3115 int __cpu; \ 3116 for_each_possible_cpu(__cpu) { \ 3117 typeof(type) *stat; \ 3118 stat = per_cpu_ptr(pcpu_stats, __cpu); \ 3119 u64_stats_init(&stat->syncp); \ 3120 } \ 3121 } \ 3122 pcpu_stats; \ 3123 }) 3124 3125 enum netdev_lag_tx_type { 3126 NETDEV_LAG_TX_TYPE_UNKNOWN, 3127 NETDEV_LAG_TX_TYPE_RANDOM, 3128 NETDEV_LAG_TX_TYPE_BROADCAST, 3129 NETDEV_LAG_TX_TYPE_ROUNDROBIN, 3130 NETDEV_LAG_TX_TYPE_ACTIVEBACKUP, 3131 NETDEV_LAG_TX_TYPE_HASH, 3132 }; 3133 3134 enum netdev_lag_hash { 3135 NETDEV_LAG_HASH_NONE, 3136 NETDEV_LAG_HASH_L2, 3137 NETDEV_LAG_HASH_L34, 3138 NETDEV_LAG_HASH_L23, 3139 NETDEV_LAG_HASH_E23, 3140 NETDEV_LAG_HASH_E34, 3141 NETDEV_LAG_HASH_VLAN_SRCMAC, 3142 NETDEV_LAG_HASH_UNKNOWN, 3143 }; 3144 3145 struct netdev_lag_upper_info { 3146 enum netdev_lag_tx_type tx_type; 3147 enum netdev_lag_hash hash_type; 3148 }; 3149 3150 struct netdev_lag_lower_state_info { 3151 u8 link_up : 1, 3152 tx_enabled : 1; 3153 }; 3154 3155 #include <linux/notifier.h> 3156 3157 /* netdevice notifier chain. Please remember to update netdev_cmd_to_name() 3158 * and the rtnetlink notification exclusion list in rtnetlink_event() when 3159 * adding new types. 3160 */ 3161 enum netdev_cmd { 3162 NETDEV_UP = 1, /* For now you can't veto a device up/down */ 3163 NETDEV_DOWN, 3164 NETDEV_REBOOT, /* Tell a protocol stack a network interface 3165 detected a hardware crash and restarted 3166 - we can use this eg to kick tcp sessions 3167 once done */ 3168 NETDEV_CHANGE, /* Notify device state change */ 3169 NETDEV_REGISTER, 3170 NETDEV_UNREGISTER, 3171 NETDEV_CHANGEMTU, /* notify after mtu change happened */ 3172 NETDEV_CHANGEADDR, /* notify after the address change */ 3173 NETDEV_PRE_CHANGEADDR, /* notify before the address change */ 3174 NETDEV_GOING_DOWN, 3175 NETDEV_CHANGENAME, 3176 NETDEV_FEAT_CHANGE, 3177 NETDEV_BONDING_FAILOVER, 3178 NETDEV_PRE_UP, 3179 NETDEV_PRE_TYPE_CHANGE, 3180 NETDEV_POST_TYPE_CHANGE, 3181 NETDEV_POST_INIT, 3182 NETDEV_PRE_UNINIT, 3183 NETDEV_RELEASE, 3184 NETDEV_NOTIFY_PEERS, 3185 NETDEV_JOIN, 3186 NETDEV_CHANGEUPPER, 3187 NETDEV_RESEND_IGMP, 3188 NETDEV_PRECHANGEMTU, /* notify before mtu change happened */ 3189 NETDEV_CHANGEINFODATA, 3190 NETDEV_BONDING_INFO, 3191 NETDEV_PRECHANGEUPPER, 3192 NETDEV_CHANGELOWERSTATE, 3193 NETDEV_UDP_TUNNEL_PUSH_INFO, 3194 NETDEV_UDP_TUNNEL_DROP_INFO, 3195 NETDEV_CHANGE_TX_QUEUE_LEN, 3196 NETDEV_CVLAN_FILTER_PUSH_INFO, 3197 NETDEV_CVLAN_FILTER_DROP_INFO, 3198 NETDEV_SVLAN_FILTER_PUSH_INFO, 3199 NETDEV_SVLAN_FILTER_DROP_INFO, 3200 NETDEV_OFFLOAD_XSTATS_ENABLE, 3201 NETDEV_OFFLOAD_XSTATS_DISABLE, 3202 NETDEV_OFFLOAD_XSTATS_REPORT_USED, 3203 NETDEV_OFFLOAD_XSTATS_REPORT_DELTA, 3204 NETDEV_XDP_FEAT_CHANGE, 3205 }; 3206 const char *netdev_cmd_to_name(enum netdev_cmd cmd); 3207 3208 int register_netdevice_notifier(struct notifier_block *nb); 3209 int unregister_netdevice_notifier(struct notifier_block *nb); 3210 int register_netdevice_notifier_net(struct net *net, struct notifier_block *nb); 3211 int unregister_netdevice_notifier_net(struct net *net, 3212 struct notifier_block *nb); 3213 int register_netdevice_notifier_dev_net(struct net_device *dev, 3214 struct notifier_block *nb, 3215 struct netdev_net_notifier *nn); 3216 int unregister_netdevice_notifier_dev_net(struct net_device *dev, 3217 struct notifier_block *nb, 3218 struct netdev_net_notifier *nn); 3219 3220 struct netdev_notifier_info { 3221 struct net_device *dev; 3222 struct netlink_ext_ack *extack; 3223 }; 3224 3225 struct netdev_notifier_info_ext { 3226 struct netdev_notifier_info info; /* must be first */ 3227 union { 3228 u32 mtu; 3229 } ext; 3230 }; 3231 3232 struct netdev_notifier_change_info { 3233 struct netdev_notifier_info info; /* must be first */ 3234 unsigned int flags_changed; 3235 }; 3236 3237 struct netdev_notifier_changeupper_info { 3238 struct netdev_notifier_info info; /* must be first */ 3239 struct net_device *upper_dev; /* new upper dev */ 3240 bool master; /* is upper dev master */ 3241 bool linking; /* is the notification for link or unlink */ 3242 void *upper_info; /* upper dev info */ 3243 }; 3244 3245 struct netdev_notifier_changelowerstate_info { 3246 struct netdev_notifier_info info; /* must be first */ 3247 void *lower_state_info; /* is lower dev state */ 3248 }; 3249 3250 struct netdev_notifier_pre_changeaddr_info { 3251 struct netdev_notifier_info info; /* must be first */ 3252 const unsigned char *dev_addr; 3253 }; 3254 3255 enum netdev_offload_xstats_type { 3256 NETDEV_OFFLOAD_XSTATS_TYPE_L3 = 1, 3257 }; 3258 3259 struct netdev_notifier_offload_xstats_info { 3260 struct netdev_notifier_info info; /* must be first */ 3261 enum netdev_offload_xstats_type type; 3262 3263 union { 3264 /* NETDEV_OFFLOAD_XSTATS_REPORT_DELTA */ 3265 struct netdev_notifier_offload_xstats_rd *report_delta; 3266 /* NETDEV_OFFLOAD_XSTATS_REPORT_USED */ 3267 struct netdev_notifier_offload_xstats_ru *report_used; 3268 }; 3269 }; 3270 3271 int netdev_offload_xstats_enable(struct net_device *dev, 3272 enum netdev_offload_xstats_type type, 3273 struct netlink_ext_ack *extack); 3274 int netdev_offload_xstats_disable(struct net_device *dev, 3275 enum netdev_offload_xstats_type type); 3276 bool netdev_offload_xstats_enabled(const struct net_device *dev, 3277 enum netdev_offload_xstats_type type); 3278 int netdev_offload_xstats_get(struct net_device *dev, 3279 enum netdev_offload_xstats_type type, 3280 struct rtnl_hw_stats64 *stats, bool *used, 3281 struct netlink_ext_ack *extack); 3282 void 3283 netdev_offload_xstats_report_delta(struct netdev_notifier_offload_xstats_rd *rd, 3284 const struct rtnl_hw_stats64 *stats); 3285 void 3286 netdev_offload_xstats_report_used(struct netdev_notifier_offload_xstats_ru *ru); 3287 void netdev_offload_xstats_push_delta(struct net_device *dev, 3288 enum netdev_offload_xstats_type type, 3289 const struct rtnl_hw_stats64 *stats); 3290 3291 static inline void netdev_notifier_info_init(struct netdev_notifier_info *info, 3292 struct net_device *dev) 3293 { 3294 info->dev = dev; 3295 info->extack = NULL; 3296 } 3297 3298 static inline struct net_device * 3299 netdev_notifier_info_to_dev(const struct netdev_notifier_info *info) 3300 { 3301 return info->dev; 3302 } 3303 3304 static inline struct netlink_ext_ack * 3305 netdev_notifier_info_to_extack(const struct netdev_notifier_info *info) 3306 { 3307 return info->extack; 3308 } 3309 3310 int call_netdevice_notifiers(unsigned long val, struct net_device *dev); 3311 int call_netdevice_notifiers_info(unsigned long val, 3312 struct netdev_notifier_info *info); 3313 3314 #define for_each_netdev(net, d) \ 3315 list_for_each_entry(d, &(net)->dev_base_head, dev_list) 3316 #define for_each_netdev_reverse(net, d) \ 3317 list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list) 3318 #define for_each_netdev_rcu(net, d) \ 3319 list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list) 3320 #define for_each_netdev_safe(net, d, n) \ 3321 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list) 3322 #define for_each_netdev_continue(net, d) \ 3323 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list) 3324 #define for_each_netdev_continue_reverse(net, d) \ 3325 list_for_each_entry_continue_reverse(d, &(net)->dev_base_head, \ 3326 dev_list) 3327 #define for_each_netdev_continue_rcu(net, d) \ 3328 list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list) 3329 #define for_each_netdev_in_bond_rcu(bond, slave) \ 3330 for_each_netdev_rcu(dev_net_rcu(bond), slave) \ 3331 if (netdev_master_upper_dev_get_rcu(slave) == (bond)) 3332 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) 3333 3334 #define for_each_netdev_dump(net, d, ifindex) \ 3335 for (; (d = xa_find(&(net)->dev_by_index, &ifindex, \ 3336 ULONG_MAX, XA_PRESENT)); ifindex++) 3337 3338 static inline struct net_device *next_net_device(struct net_device *dev) 3339 { 3340 struct list_head *lh; 3341 struct net *net; 3342 3343 net = dev_net(dev); 3344 lh = dev->dev_list.next; 3345 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 3346 } 3347 3348 static inline struct net_device *next_net_device_rcu(struct net_device *dev) 3349 { 3350 struct list_head *lh; 3351 struct net *net; 3352 3353 net = dev_net(dev); 3354 lh = rcu_dereference(list_next_rcu(&dev->dev_list)); 3355 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 3356 } 3357 3358 static inline struct net_device *first_net_device(struct net *net) 3359 { 3360 return list_empty(&net->dev_base_head) ? NULL : 3361 net_device_entry(net->dev_base_head.next); 3362 } 3363 3364 int netdev_boot_setup_check(struct net_device *dev); 3365 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, 3366 const char *hwaddr); 3367 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, 3368 const char *hwaddr); 3369 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type); 3370 void dev_add_pack(struct packet_type *pt); 3371 void dev_remove_pack(struct packet_type *pt); 3372 void __dev_remove_pack(struct packet_type *pt); 3373 void dev_add_offload(struct packet_offload *po); 3374 void dev_remove_offload(struct packet_offload *po); 3375 3376 int dev_get_iflink(const struct net_device *dev); 3377 int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb); 3378 int dev_fill_forward_path(const struct net_device *dev, const u8 *daddr, 3379 struct net_device_path_stack *stack); 3380 struct net_device *dev_get_by_name(struct net *net, const char *name); 3381 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name); 3382 struct net_device *__dev_get_by_name(struct net *net, const char *name); 3383 bool netdev_name_in_use(struct net *net, const char *name); 3384 int dev_alloc_name(struct net_device *dev, const char *name); 3385 int netif_open(struct net_device *dev, struct netlink_ext_ack *extack); 3386 int dev_open(struct net_device *dev, struct netlink_ext_ack *extack); 3387 void netif_close(struct net_device *dev); 3388 void dev_close(struct net_device *dev); 3389 void netif_close_many(struct list_head *head, bool unlink); 3390 void netif_disable_lro(struct net_device *dev); 3391 void dev_disable_lro(struct net_device *dev); 3392 int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *newskb); 3393 u16 dev_pick_tx_zero(struct net_device *dev, struct sk_buff *skb, 3394 struct net_device *sb_dev); 3395 3396 int __dev_queue_xmit(struct sk_buff *skb, struct net_device *sb_dev); 3397 int __dev_direct_xmit(struct sk_buff *skb, u16 queue_id); 3398 3399 static inline int dev_queue_xmit(struct sk_buff *skb) 3400 { 3401 return __dev_queue_xmit(skb, NULL); 3402 } 3403 3404 static inline int dev_queue_xmit_accel(struct sk_buff *skb, 3405 struct net_device *sb_dev) 3406 { 3407 return __dev_queue_xmit(skb, sb_dev); 3408 } 3409 3410 static inline int dev_direct_xmit(struct sk_buff *skb, u16 queue_id) 3411 { 3412 int ret; 3413 3414 ret = __dev_direct_xmit(skb, queue_id); 3415 if (!dev_xmit_complete(ret)) 3416 kfree_skb(skb); 3417 return ret; 3418 } 3419 3420 int register_netdevice(struct net_device *dev); 3421 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head); 3422 void unregister_netdevice_many(struct list_head *head); 3423 bool unregister_netdevice_queued(const struct net_device *dev); 3424 3425 static inline void unregister_netdevice(struct net_device *dev) 3426 { 3427 unregister_netdevice_queue(dev, NULL); 3428 } 3429 3430 int netdev_refcnt_read(const struct net_device *dev); 3431 void free_netdev(struct net_device *dev); 3432 3433 struct net_device *netdev_get_xmit_slave(struct net_device *dev, 3434 struct sk_buff *skb, 3435 bool all_slaves); 3436 struct net_device *netdev_sk_get_lowest_dev(struct net_device *dev, 3437 struct sock *sk); 3438 struct net_device *dev_get_by_index(struct net *net, int ifindex); 3439 struct net_device *__dev_get_by_index(struct net *net, int ifindex); 3440 struct net_device *netdev_get_by_index(struct net *net, int ifindex, 3441 netdevice_tracker *tracker, gfp_t gfp); 3442 struct net_device *netdev_get_by_index_lock(struct net *net, int ifindex); 3443 struct net_device *netdev_get_by_name(struct net *net, const char *name, 3444 netdevice_tracker *tracker, gfp_t gfp); 3445 struct net_device *netdev_get_by_flags_rcu(struct net *net, netdevice_tracker *tracker, 3446 unsigned short flags, unsigned short mask); 3447 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex); 3448 void netdev_copy_name(struct net_device *dev, char *name); 3449 3450 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, 3451 unsigned short type, 3452 const void *daddr, const void *saddr, 3453 unsigned int len) 3454 { 3455 if (!dev->header_ops || !dev->header_ops->create) 3456 return 0; 3457 3458 return dev->header_ops->create(skb, dev, type, daddr, saddr, len); 3459 } 3460 3461 static inline int dev_parse_header(const struct sk_buff *skb, 3462 unsigned char *haddr) 3463 { 3464 const struct net_device *dev = skb->dev; 3465 3466 if (!dev->header_ops || !dev->header_ops->parse) 3467 return 0; 3468 return dev->header_ops->parse(skb, dev, haddr); 3469 } 3470 3471 static inline __be16 dev_parse_header_protocol(const struct sk_buff *skb) 3472 { 3473 const struct net_device *dev = skb->dev; 3474 3475 if (!dev->header_ops || !dev->header_ops->parse_protocol) 3476 return 0; 3477 return dev->header_ops->parse_protocol(skb); 3478 } 3479 3480 /* ll_header must have at least hard_header_len allocated */ 3481 static inline bool dev_validate_header(const struct net_device *dev, 3482 char *ll_header, int len) 3483 { 3484 if (likely(len >= dev->hard_header_len)) 3485 return true; 3486 if (len < dev->min_header_len) 3487 return false; 3488 3489 if (capable(CAP_SYS_RAWIO)) { 3490 memset(ll_header + len, 0, dev->hard_header_len - len); 3491 return true; 3492 } 3493 3494 if (dev->header_ops && dev->header_ops->validate) 3495 return dev->header_ops->validate(ll_header, len); 3496 3497 return false; 3498 } 3499 3500 static inline bool dev_has_header(const struct net_device *dev) 3501 { 3502 return dev->header_ops && dev->header_ops->create; 3503 } 3504 3505 struct numa_drop_counters { 3506 atomic_t drops0 ____cacheline_aligned_in_smp; 3507 atomic_t drops1 ____cacheline_aligned_in_smp; 3508 }; 3509 3510 static inline int numa_drop_read(const struct numa_drop_counters *ndc) 3511 { 3512 return atomic_read(&ndc->drops0) + atomic_read(&ndc->drops1); 3513 } 3514 3515 static inline void numa_drop_add(struct numa_drop_counters *ndc, int val) 3516 { 3517 int n = numa_node_id() % 2; 3518 3519 if (n) 3520 atomic_add(val, &ndc->drops1); 3521 else 3522 atomic_add(val, &ndc->drops0); 3523 } 3524 3525 static inline void numa_drop_reset(struct numa_drop_counters *ndc) 3526 { 3527 atomic_set(&ndc->drops0, 0); 3528 atomic_set(&ndc->drops1, 0); 3529 } 3530 3531 /* 3532 * Incoming packets are placed on per-CPU queues 3533 */ 3534 struct softnet_data { 3535 struct list_head poll_list; 3536 struct sk_buff_head process_queue; 3537 local_lock_t process_queue_bh_lock; 3538 3539 /* stats */ 3540 unsigned int processed; 3541 unsigned int time_squeeze; 3542 #ifdef CONFIG_RPS 3543 struct softnet_data *rps_ipi_list; 3544 #endif 3545 3546 unsigned int received_rps; 3547 bool in_net_rx_action; 3548 bool in_napi_threaded_poll; 3549 3550 #ifdef CONFIG_NET_FLOW_LIMIT 3551 struct sd_flow_limit __rcu *flow_limit; 3552 #endif 3553 struct Qdisc *output_queue; 3554 struct Qdisc **output_queue_tailp; 3555 struct sk_buff *completion_queue; 3556 #ifdef CONFIG_XFRM_OFFLOAD 3557 struct sk_buff_head xfrm_backlog; 3558 #endif 3559 /* written and read only by owning cpu: */ 3560 struct netdev_xmit xmit; 3561 #ifdef CONFIG_RPS 3562 /* input_queue_head should be written by cpu owning this struct, 3563 * and only read by other cpus. Worth using a cache line. 3564 */ 3565 unsigned int input_queue_head ____cacheline_aligned_in_smp; 3566 3567 /* Elements below can be accessed between CPUs for RPS/RFS */ 3568 call_single_data_t csd ____cacheline_aligned_in_smp; 3569 struct softnet_data *rps_ipi_next; 3570 unsigned int cpu; 3571 3572 /* We force a cacheline alignment from here, to hold together 3573 * input_queue_tail, input_pkt_queue and backlog.state. 3574 * We add holes so that backlog.state is the last field 3575 * of this cache line. 3576 */ 3577 long pad[3] ____cacheline_aligned_in_smp; 3578 unsigned int input_queue_tail; 3579 #endif 3580 struct sk_buff_head input_pkt_queue; 3581 3582 struct napi_struct backlog; 3583 3584 struct numa_drop_counters drop_counters; 3585 3586 int defer_ipi_scheduled ____cacheline_aligned_in_smp; 3587 call_single_data_t defer_csd; 3588 }; 3589 3590 DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); 3591 3592 struct page_pool_bh { 3593 struct page_pool *pool; 3594 local_lock_t bh_lock; 3595 }; 3596 DECLARE_PER_CPU(struct page_pool_bh, system_page_pool); 3597 3598 #define XMIT_RECURSION_LIMIT 8 3599 3600 #ifndef CONFIG_PREEMPT_RT 3601 static inline int dev_recursion_level(void) 3602 { 3603 return this_cpu_read(softnet_data.xmit.recursion); 3604 } 3605 3606 static inline bool dev_xmit_recursion(void) 3607 { 3608 return unlikely(__this_cpu_read(softnet_data.xmit.recursion) > 3609 XMIT_RECURSION_LIMIT); 3610 } 3611 3612 static inline void dev_xmit_recursion_inc(void) 3613 { 3614 __this_cpu_inc(softnet_data.xmit.recursion); 3615 } 3616 3617 static inline void dev_xmit_recursion_dec(void) 3618 { 3619 __this_cpu_dec(softnet_data.xmit.recursion); 3620 } 3621 #else 3622 static inline int dev_recursion_level(void) 3623 { 3624 return current->net_xmit.recursion; 3625 } 3626 3627 static inline bool dev_xmit_recursion(void) 3628 { 3629 return unlikely(current->net_xmit.recursion > XMIT_RECURSION_LIMIT); 3630 } 3631 3632 static inline void dev_xmit_recursion_inc(void) 3633 { 3634 current->net_xmit.recursion++; 3635 } 3636 3637 static inline void dev_xmit_recursion_dec(void) 3638 { 3639 current->net_xmit.recursion--; 3640 } 3641 #endif 3642 3643 void __netif_schedule(struct Qdisc *q); 3644 void netif_schedule_queue(struct netdev_queue *txq); 3645 3646 static inline void netif_tx_schedule_all(struct net_device *dev) 3647 { 3648 unsigned int i; 3649 3650 for (i = 0; i < dev->num_tx_queues; i++) 3651 netif_schedule_queue(netdev_get_tx_queue(dev, i)); 3652 } 3653 3654 static __always_inline void netif_tx_start_queue(struct netdev_queue *dev_queue) 3655 { 3656 clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state); 3657 } 3658 3659 /** 3660 * netif_start_queue - allow transmit 3661 * @dev: network device 3662 * 3663 * Allow upper layers to call the device hard_start_xmit routine. 3664 */ 3665 static inline void netif_start_queue(struct net_device *dev) 3666 { 3667 netif_tx_start_queue(netdev_get_tx_queue(dev, 0)); 3668 } 3669 3670 static inline void netif_tx_start_all_queues(struct net_device *dev) 3671 { 3672 unsigned int i; 3673 3674 for (i = 0; i < dev->num_tx_queues; i++) { 3675 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 3676 netif_tx_start_queue(txq); 3677 } 3678 } 3679 3680 void netif_tx_wake_queue(struct netdev_queue *dev_queue); 3681 3682 /** 3683 * netif_wake_queue - restart transmit 3684 * @dev: network device 3685 * 3686 * Allow upper layers to call the device hard_start_xmit routine. 3687 * Used for flow control when transmit resources are available. 3688 */ 3689 static inline void netif_wake_queue(struct net_device *dev) 3690 { 3691 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0)); 3692 } 3693 3694 static inline void netif_tx_wake_all_queues(struct net_device *dev) 3695 { 3696 unsigned int i; 3697 3698 for (i = 0; i < dev->num_tx_queues; i++) { 3699 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 3700 netif_tx_wake_queue(txq); 3701 } 3702 } 3703 3704 static __always_inline void netif_tx_stop_queue(struct netdev_queue *dev_queue) 3705 { 3706 /* Paired with READ_ONCE() from dev_watchdog() */ 3707 WRITE_ONCE(dev_queue->trans_start, jiffies); 3708 3709 /* This barrier is paired with smp_mb() from dev_watchdog() */ 3710 smp_mb__before_atomic(); 3711 3712 /* Must be an atomic op see netif_txq_try_stop() */ 3713 set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state); 3714 } 3715 3716 /** 3717 * netif_stop_queue - stop transmitted packets 3718 * @dev: network device 3719 * 3720 * Stop upper layers calling the device hard_start_xmit routine. 3721 * Used for flow control when transmit resources are unavailable. 3722 */ 3723 static inline void netif_stop_queue(struct net_device *dev) 3724 { 3725 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0)); 3726 } 3727 3728 void netif_tx_stop_all_queues(struct net_device *dev); 3729 3730 static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue) 3731 { 3732 return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state); 3733 } 3734 3735 /** 3736 * netif_queue_stopped - test if transmit queue is flowblocked 3737 * @dev: network device 3738 * 3739 * Test if transmit queue on device is currently unable to send. 3740 */ 3741 static inline bool netif_queue_stopped(const struct net_device *dev) 3742 { 3743 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0)); 3744 } 3745 3746 static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue) 3747 { 3748 return dev_queue->state & QUEUE_STATE_ANY_XOFF; 3749 } 3750 3751 static inline bool 3752 netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue) 3753 { 3754 return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN; 3755 } 3756 3757 static inline bool 3758 netif_xmit_frozen_or_drv_stopped(const struct netdev_queue *dev_queue) 3759 { 3760 return dev_queue->state & QUEUE_STATE_DRV_XOFF_OR_FROZEN; 3761 } 3762 3763 /** 3764 * netdev_queue_set_dql_min_limit - set dql minimum limit 3765 * @dev_queue: pointer to transmit queue 3766 * @min_limit: dql minimum limit 3767 * 3768 * Forces xmit_more() to return true until the minimum threshold 3769 * defined by @min_limit is reached (or until the tx queue is 3770 * empty). Warning: to be use with care, misuse will impact the 3771 * latency. 3772 */ 3773 static inline void netdev_queue_set_dql_min_limit(struct netdev_queue *dev_queue, 3774 unsigned int min_limit) 3775 { 3776 #ifdef CONFIG_BQL 3777 dev_queue->dql.min_limit = min_limit; 3778 #endif 3779 } 3780 3781 static inline int netdev_queue_dql_avail(const struct netdev_queue *txq) 3782 { 3783 #ifdef CONFIG_BQL 3784 /* Non-BQL migrated drivers will return 0, too. */ 3785 return dql_avail(&txq->dql); 3786 #else 3787 return 0; 3788 #endif 3789 } 3790 3791 /** 3792 * netdev_txq_bql_enqueue_prefetchw - prefetch bql data for write 3793 * @dev_queue: pointer to transmit queue 3794 * 3795 * BQL enabled drivers might use this helper in their ndo_start_xmit(), 3796 * to give appropriate hint to the CPU. 3797 */ 3798 static inline void netdev_txq_bql_enqueue_prefetchw(struct netdev_queue *dev_queue) 3799 { 3800 #ifdef CONFIG_BQL 3801 prefetchw(&dev_queue->dql.num_queued); 3802 #endif 3803 } 3804 3805 /** 3806 * netdev_txq_bql_complete_prefetchw - prefetch bql data for write 3807 * @dev_queue: pointer to transmit queue 3808 * 3809 * BQL enabled drivers might use this helper in their TX completion path, 3810 * to give appropriate hint to the CPU. 3811 */ 3812 static inline void netdev_txq_bql_complete_prefetchw(struct netdev_queue *dev_queue) 3813 { 3814 #ifdef CONFIG_BQL 3815 prefetchw(&dev_queue->dql.limit); 3816 #endif 3817 } 3818 3819 /** 3820 * netdev_tx_sent_queue - report the number of bytes queued to a given tx queue 3821 * @dev_queue: network device queue 3822 * @bytes: number of bytes queued to the device queue 3823 * 3824 * Report the number of bytes queued for sending/completion to the network 3825 * device hardware queue. @bytes should be a good approximation and should 3826 * exactly match netdev_completed_queue() @bytes. 3827 * This is typically called once per packet, from ndo_start_xmit(). 3828 */ 3829 static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue, 3830 unsigned int bytes) 3831 { 3832 #ifdef CONFIG_BQL 3833 dql_queued(&dev_queue->dql, bytes); 3834 3835 if (likely(dql_avail(&dev_queue->dql) >= 0)) 3836 return; 3837 3838 /* Paired with READ_ONCE() from dev_watchdog() */ 3839 WRITE_ONCE(dev_queue->trans_start, jiffies); 3840 3841 /* This barrier is paired with smp_mb() from dev_watchdog() */ 3842 smp_mb__before_atomic(); 3843 3844 set_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state); 3845 3846 /* 3847 * The XOFF flag must be set before checking the dql_avail below, 3848 * because in netdev_tx_completed_queue we update the dql_completed 3849 * before checking the XOFF flag. 3850 */ 3851 smp_mb__after_atomic(); 3852 3853 /* check again in case another CPU has just made room avail */ 3854 if (unlikely(dql_avail(&dev_queue->dql) >= 0)) 3855 clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state); 3856 #endif 3857 } 3858 3859 /* Variant of netdev_tx_sent_queue() for drivers that are aware 3860 * that they should not test BQL status themselves. 3861 * We do want to change __QUEUE_STATE_STACK_XOFF only for the last 3862 * skb of a batch. 3863 * Returns true if the doorbell must be used to kick the NIC. 3864 */ 3865 static inline bool __netdev_tx_sent_queue(struct netdev_queue *dev_queue, 3866 unsigned int bytes, 3867 bool xmit_more) 3868 { 3869 if (xmit_more) { 3870 #ifdef CONFIG_BQL 3871 dql_queued(&dev_queue->dql, bytes); 3872 #endif 3873 return netif_tx_queue_stopped(dev_queue); 3874 } 3875 netdev_tx_sent_queue(dev_queue, bytes); 3876 return true; 3877 } 3878 3879 /** 3880 * netdev_sent_queue - report the number of bytes queued to hardware 3881 * @dev: network device 3882 * @bytes: number of bytes queued to the hardware device queue 3883 * 3884 * Report the number of bytes queued for sending/completion to the network 3885 * device hardware queue#0. @bytes should be a good approximation and should 3886 * exactly match netdev_completed_queue() @bytes. 3887 * This is typically called once per packet, from ndo_start_xmit(). 3888 */ 3889 static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes) 3890 { 3891 netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes); 3892 } 3893 3894 static inline bool __netdev_sent_queue(struct net_device *dev, 3895 unsigned int bytes, 3896 bool xmit_more) 3897 { 3898 return __netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes, 3899 xmit_more); 3900 } 3901 3902 /** 3903 * netdev_tx_completed_queue - report number of packets/bytes at TX completion. 3904 * @dev_queue: network device queue 3905 * @pkts: number of packets (currently ignored) 3906 * @bytes: number of bytes dequeued from the device queue 3907 * 3908 * Must be called at most once per TX completion round (and not per 3909 * individual packet), so that BQL can adjust its limits appropriately. 3910 */ 3911 static inline void netdev_tx_completed_queue(struct netdev_queue *dev_queue, 3912 unsigned int pkts, unsigned int bytes) 3913 { 3914 #ifdef CONFIG_BQL 3915 if (unlikely(!bytes)) 3916 return; 3917 3918 dql_completed(&dev_queue->dql, bytes); 3919 3920 /* 3921 * Without the memory barrier there is a small possibility that 3922 * netdev_tx_sent_queue will miss the update and cause the queue to 3923 * be stopped forever 3924 */ 3925 smp_mb(); /* NOTE: netdev_txq_completed_mb() assumes this exists */ 3926 3927 if (unlikely(dql_avail(&dev_queue->dql) < 0)) 3928 return; 3929 3930 if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state)) 3931 netif_schedule_queue(dev_queue); 3932 #endif 3933 } 3934 3935 /** 3936 * netdev_completed_queue - report bytes and packets completed by device 3937 * @dev: network device 3938 * @pkts: actual number of packets sent over the medium 3939 * @bytes: actual number of bytes sent over the medium 3940 * 3941 * Report the number of bytes and packets transmitted by the network device 3942 * hardware queue over the physical medium, @bytes must exactly match the 3943 * @bytes amount passed to netdev_sent_queue() 3944 */ 3945 static inline void netdev_completed_queue(struct net_device *dev, 3946 unsigned int pkts, unsigned int bytes) 3947 { 3948 netdev_tx_completed_queue(netdev_get_tx_queue(dev, 0), pkts, bytes); 3949 } 3950 3951 static inline void netdev_tx_reset_queue(struct netdev_queue *q) 3952 { 3953 #ifdef CONFIG_BQL 3954 clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state); 3955 dql_reset(&q->dql); 3956 #endif 3957 } 3958 3959 /** 3960 * netdev_tx_reset_subqueue - reset the BQL stats and state of a netdev queue 3961 * @dev: network device 3962 * @qid: stack index of the queue to reset 3963 */ 3964 static inline void netdev_tx_reset_subqueue(const struct net_device *dev, 3965 u32 qid) 3966 { 3967 netdev_tx_reset_queue(netdev_get_tx_queue(dev, qid)); 3968 } 3969 3970 /** 3971 * netdev_reset_queue - reset the packets and bytes count of a network device 3972 * @dev_queue: network device 3973 * 3974 * Reset the bytes and packet count of a network device and clear the 3975 * software flow control OFF bit for this network device 3976 */ 3977 static inline void netdev_reset_queue(struct net_device *dev_queue) 3978 { 3979 netdev_tx_reset_subqueue(dev_queue, 0); 3980 } 3981 3982 /** 3983 * netdev_cap_txqueue - check if selected tx queue exceeds device queues 3984 * @dev: network device 3985 * @queue_index: given tx queue index 3986 * 3987 * Returns 0 if given tx queue index >= number of device tx queues, 3988 * otherwise returns the originally passed tx queue index. 3989 */ 3990 static inline u16 netdev_cap_txqueue(struct net_device *dev, u16 queue_index) 3991 { 3992 if (unlikely(queue_index >= dev->real_num_tx_queues)) { 3993 net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n", 3994 dev->name, queue_index, 3995 dev->real_num_tx_queues); 3996 return 0; 3997 } 3998 3999 return queue_index; 4000 } 4001 4002 /** 4003 * netif_running - test if up 4004 * @dev: network device 4005 * 4006 * Test if the device has been brought up. 4007 */ 4008 static inline bool netif_running(const struct net_device *dev) 4009 { 4010 return test_bit(__LINK_STATE_START, &dev->state); 4011 } 4012 4013 /* 4014 * Routines to manage the subqueues on a device. We only need start, 4015 * stop, and a check if it's stopped. All other device management is 4016 * done at the overall netdevice level. 4017 * Also test the device if we're multiqueue. 4018 */ 4019 4020 /** 4021 * netif_start_subqueue - allow sending packets on subqueue 4022 * @dev: network device 4023 * @queue_index: sub queue index 4024 * 4025 * Start individual transmit queue of a device with multiple transmit queues. 4026 */ 4027 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 4028 { 4029 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 4030 4031 netif_tx_start_queue(txq); 4032 } 4033 4034 /** 4035 * netif_stop_subqueue - stop sending packets on subqueue 4036 * @dev: network device 4037 * @queue_index: sub queue index 4038 * 4039 * Stop individual transmit queue of a device with multiple transmit queues. 4040 */ 4041 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 4042 { 4043 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 4044 netif_tx_stop_queue(txq); 4045 } 4046 4047 /** 4048 * __netif_subqueue_stopped - test status of subqueue 4049 * @dev: network device 4050 * @queue_index: sub queue index 4051 * 4052 * Check individual transmit queue of a device with multiple transmit queues. 4053 */ 4054 static inline bool __netif_subqueue_stopped(const struct net_device *dev, 4055 u16 queue_index) 4056 { 4057 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 4058 4059 return netif_tx_queue_stopped(txq); 4060 } 4061 4062 /** 4063 * netif_subqueue_stopped - test status of subqueue 4064 * @dev: network device 4065 * @skb: sub queue buffer pointer 4066 * 4067 * Check individual transmit queue of a device with multiple transmit queues. 4068 */ 4069 static inline bool netif_subqueue_stopped(const struct net_device *dev, 4070 struct sk_buff *skb) 4071 { 4072 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb)); 4073 } 4074 4075 /** 4076 * netif_wake_subqueue - allow sending packets on subqueue 4077 * @dev: network device 4078 * @queue_index: sub queue index 4079 * 4080 * Resume individual transmit queue of a device with multiple transmit queues. 4081 */ 4082 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 4083 { 4084 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 4085 4086 netif_tx_wake_queue(txq); 4087 } 4088 4089 #ifdef CONFIG_XPS 4090 int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask, 4091 u16 index); 4092 int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask, 4093 u16 index, enum xps_map_type type); 4094 4095 /** 4096 * netif_attr_test_mask - Test a CPU or Rx queue set in a mask 4097 * @j: CPU/Rx queue index 4098 * @mask: bitmask of all cpus/rx queues 4099 * @nr_bits: number of bits in the bitmask 4100 * 4101 * Test if a CPU or Rx queue index is set in a mask of all CPU/Rx queues. 4102 */ 4103 static inline bool netif_attr_test_mask(unsigned long j, 4104 const unsigned long *mask, 4105 unsigned int nr_bits) 4106 { 4107 cpu_max_bits_warn(j, nr_bits); 4108 return test_bit(j, mask); 4109 } 4110 4111 /** 4112 * netif_attr_test_online - Test for online CPU/Rx queue 4113 * @j: CPU/Rx queue index 4114 * @online_mask: bitmask for CPUs/Rx queues that are online 4115 * @nr_bits: number of bits in the bitmask 4116 * 4117 * Returns: true if a CPU/Rx queue is online. 4118 */ 4119 static inline bool netif_attr_test_online(unsigned long j, 4120 const unsigned long *online_mask, 4121 unsigned int nr_bits) 4122 { 4123 cpu_max_bits_warn(j, nr_bits); 4124 4125 if (online_mask) 4126 return test_bit(j, online_mask); 4127 4128 return (j < nr_bits); 4129 } 4130 4131 /** 4132 * netif_attrmask_next - get the next CPU/Rx queue in a cpu/Rx queues mask 4133 * @n: CPU/Rx queue index 4134 * @srcp: the cpumask/Rx queue mask pointer 4135 * @nr_bits: number of bits in the bitmask 4136 * 4137 * Returns: next (after n) CPU/Rx queue index in the mask; 4138 * >= nr_bits if no further CPUs/Rx queues set. 4139 */ 4140 static inline unsigned int netif_attrmask_next(int n, const unsigned long *srcp, 4141 unsigned int nr_bits) 4142 { 4143 /* -1 is a legal arg here. */ 4144 if (n != -1) 4145 cpu_max_bits_warn(n, nr_bits); 4146 4147 if (srcp) 4148 return find_next_bit(srcp, nr_bits, n + 1); 4149 4150 return n + 1; 4151 } 4152 4153 /** 4154 * netif_attrmask_next_and - get the next CPU/Rx queue in \*src1p & \*src2p 4155 * @n: CPU/Rx queue index 4156 * @src1p: the first CPUs/Rx queues mask pointer 4157 * @src2p: the second CPUs/Rx queues mask pointer 4158 * @nr_bits: number of bits in the bitmask 4159 * 4160 * Returns: next (after n) CPU/Rx queue index set in both masks; 4161 * >= nr_bits if no further CPUs/Rx queues set in both. 4162 */ 4163 static inline int netif_attrmask_next_and(int n, const unsigned long *src1p, 4164 const unsigned long *src2p, 4165 unsigned int nr_bits) 4166 { 4167 /* -1 is a legal arg here. */ 4168 if (n != -1) 4169 cpu_max_bits_warn(n, nr_bits); 4170 4171 if (src1p && src2p) 4172 return find_next_and_bit(src1p, src2p, nr_bits, n + 1); 4173 else if (src1p) 4174 return find_next_bit(src1p, nr_bits, n + 1); 4175 else if (src2p) 4176 return find_next_bit(src2p, nr_bits, n + 1); 4177 4178 return n + 1; 4179 } 4180 #else 4181 static inline int netif_set_xps_queue(struct net_device *dev, 4182 const struct cpumask *mask, 4183 u16 index) 4184 { 4185 return 0; 4186 } 4187 4188 static inline int __netif_set_xps_queue(struct net_device *dev, 4189 const unsigned long *mask, 4190 u16 index, enum xps_map_type type) 4191 { 4192 return 0; 4193 } 4194 #endif 4195 4196 /** 4197 * netif_is_multiqueue - test if device has multiple transmit queues 4198 * @dev: network device 4199 * 4200 * Check if device has multiple transmit queues 4201 */ 4202 static inline bool netif_is_multiqueue(const struct net_device *dev) 4203 { 4204 return dev->num_tx_queues > 1; 4205 } 4206 4207 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq); 4208 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq); 4209 int netif_set_real_num_queues(struct net_device *dev, 4210 unsigned int txq, unsigned int rxq); 4211 4212 int netif_get_num_default_rss_queues(void); 4213 4214 void dev_kfree_skb_irq_reason(struct sk_buff *skb, enum skb_drop_reason reason); 4215 void dev_kfree_skb_any_reason(struct sk_buff *skb, enum skb_drop_reason reason); 4216 4217 /* 4218 * It is not allowed to call kfree_skb() or consume_skb() from hardware 4219 * interrupt context or with hardware interrupts being disabled. 4220 * (in_hardirq() || irqs_disabled()) 4221 * 4222 * We provide four helpers that can be used in following contexts : 4223 * 4224 * dev_kfree_skb_irq(skb) when caller drops a packet from irq context, 4225 * replacing kfree_skb(skb) 4226 * 4227 * dev_consume_skb_irq(skb) when caller consumes a packet from irq context. 4228 * Typically used in place of consume_skb(skb) in TX completion path 4229 * 4230 * dev_kfree_skb_any(skb) when caller doesn't know its current irq context, 4231 * replacing kfree_skb(skb) 4232 * 4233 * dev_consume_skb_any(skb) when caller doesn't know its current irq context, 4234 * and consumed a packet. Used in place of consume_skb(skb) 4235 */ 4236 static inline void dev_kfree_skb_irq(struct sk_buff *skb) 4237 { 4238 dev_kfree_skb_irq_reason(skb, SKB_DROP_REASON_NOT_SPECIFIED); 4239 } 4240 4241 static inline void dev_consume_skb_irq(struct sk_buff *skb) 4242 { 4243 dev_kfree_skb_irq_reason(skb, SKB_CONSUMED); 4244 } 4245 4246 static inline void dev_kfree_skb_any(struct sk_buff *skb) 4247 { 4248 dev_kfree_skb_any_reason(skb, SKB_DROP_REASON_NOT_SPECIFIED); 4249 } 4250 4251 static inline void dev_consume_skb_any(struct sk_buff *skb) 4252 { 4253 dev_kfree_skb_any_reason(skb, SKB_CONSUMED); 4254 } 4255 4256 u32 bpf_prog_run_generic_xdp(struct sk_buff *skb, struct xdp_buff *xdp, 4257 const struct bpf_prog *xdp_prog); 4258 void generic_xdp_tx(struct sk_buff *skb, const struct bpf_prog *xdp_prog); 4259 int do_xdp_generic(const struct bpf_prog *xdp_prog, struct sk_buff **pskb); 4260 int netif_rx(struct sk_buff *skb); 4261 int __netif_rx(struct sk_buff *skb); 4262 4263 int netif_receive_skb(struct sk_buff *skb); 4264 int netif_receive_skb_core(struct sk_buff *skb); 4265 void netif_receive_skb_list_internal(struct list_head *head); 4266 void netif_receive_skb_list(struct list_head *head); 4267 gro_result_t gro_receive_skb(struct gro_node *gro, struct sk_buff *skb); 4268 4269 static inline gro_result_t napi_gro_receive(struct napi_struct *napi, 4270 struct sk_buff *skb) 4271 { 4272 return gro_receive_skb(&napi->gro, skb); 4273 } 4274 4275 struct sk_buff *napi_get_frags(struct napi_struct *napi); 4276 gro_result_t napi_gro_frags(struct napi_struct *napi); 4277 4278 static inline void napi_free_frags(struct napi_struct *napi) 4279 { 4280 kfree_skb(napi->skb); 4281 napi->skb = NULL; 4282 } 4283 4284 bool netdev_is_rx_handler_busy(struct net_device *dev); 4285 int netdev_rx_handler_register(struct net_device *dev, 4286 rx_handler_func_t *rx_handler, 4287 void *rx_handler_data); 4288 void netdev_rx_handler_unregister(struct net_device *dev); 4289 4290 bool dev_valid_name(const char *name); 4291 static inline bool is_socket_ioctl_cmd(unsigned int cmd) 4292 { 4293 return _IOC_TYPE(cmd) == SOCK_IOC_TYPE; 4294 } 4295 int get_user_ifreq(struct ifreq *ifr, void __user **ifrdata, void __user *arg); 4296 int put_user_ifreq(struct ifreq *ifr, void __user *arg); 4297 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, 4298 void __user *data, bool *need_copyout); 4299 int dev_ifconf(struct net *net, struct ifconf __user *ifc); 4300 int dev_eth_ioctl(struct net_device *dev, 4301 struct ifreq *ifr, unsigned int cmd); 4302 int generic_hwtstamp_get_lower(struct net_device *dev, 4303 struct kernel_hwtstamp_config *kernel_cfg); 4304 int generic_hwtstamp_set_lower(struct net_device *dev, 4305 struct kernel_hwtstamp_config *kernel_cfg, 4306 struct netlink_ext_ack *extack); 4307 int dev_ethtool(struct net *net, struct ifreq *ifr, void __user *userdata); 4308 unsigned int netif_get_flags(const struct net_device *dev); 4309 int __dev_change_flags(struct net_device *dev, unsigned int flags, 4310 struct netlink_ext_ack *extack); 4311 int netif_change_flags(struct net_device *dev, unsigned int flags, 4312 struct netlink_ext_ack *extack); 4313 int dev_change_flags(struct net_device *dev, unsigned int flags, 4314 struct netlink_ext_ack *extack); 4315 int netif_set_alias(struct net_device *dev, const char *alias, size_t len); 4316 int dev_set_alias(struct net_device *, const char *, size_t); 4317 int dev_get_alias(const struct net_device *, char *, size_t); 4318 int __dev_change_net_namespace(struct net_device *dev, struct net *net, 4319 const char *pat, int new_ifindex, 4320 struct netlink_ext_ack *extack); 4321 int dev_change_net_namespace(struct net_device *dev, struct net *net, 4322 const char *pat); 4323 int __netif_set_mtu(struct net_device *dev, int new_mtu); 4324 int netif_set_mtu(struct net_device *dev, int new_mtu); 4325 int dev_set_mtu(struct net_device *, int); 4326 int netif_pre_changeaddr_notify(struct net_device *dev, const char *addr, 4327 struct netlink_ext_ack *extack); 4328 int netif_set_mac_address(struct net_device *dev, struct sockaddr_storage *ss, 4329 struct netlink_ext_ack *extack); 4330 int dev_set_mac_address(struct net_device *dev, struct sockaddr_storage *ss, 4331 struct netlink_ext_ack *extack); 4332 int dev_set_mac_address_user(struct net_device *dev, struct sockaddr_storage *ss, 4333 struct netlink_ext_ack *extack); 4334 int netif_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name); 4335 int netif_get_port_parent_id(struct net_device *dev, 4336 struct netdev_phys_item_id *ppid, bool recurse); 4337 bool netdev_port_same_parent_id(struct net_device *a, struct net_device *b); 4338 4339 struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again); 4340 struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, 4341 struct netdev_queue *txq, int *ret); 4342 4343 int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog); 4344 u8 dev_xdp_prog_count(struct net_device *dev); 4345 int netif_xdp_propagate(struct net_device *dev, struct netdev_bpf *bpf); 4346 int dev_xdp_propagate(struct net_device *dev, struct netdev_bpf *bpf); 4347 u8 dev_xdp_sb_prog_count(struct net_device *dev); 4348 u32 dev_xdp_prog_id(struct net_device *dev, enum bpf_xdp_mode mode); 4349 4350 u32 dev_get_min_mp_channel_count(const struct net_device *dev); 4351 4352 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb); 4353 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb); 4354 int dev_forward_skb_nomtu(struct net_device *dev, struct sk_buff *skb); 4355 bool is_skb_forwardable(const struct net_device *dev, 4356 const struct sk_buff *skb); 4357 4358 static __always_inline bool __is_skb_forwardable(const struct net_device *dev, 4359 const struct sk_buff *skb, 4360 const bool check_mtu) 4361 { 4362 const u32 vlan_hdr_len = 4; /* VLAN_HLEN */ 4363 unsigned int len; 4364 4365 if (!(dev->flags & IFF_UP)) 4366 return false; 4367 4368 if (!check_mtu) 4369 return true; 4370 4371 len = dev->mtu + dev->hard_header_len + vlan_hdr_len; 4372 if (skb->len <= len) 4373 return true; 4374 4375 /* if TSO is enabled, we don't care about the length as the packet 4376 * could be forwarded without being segmented before 4377 */ 4378 if (skb_is_gso(skb)) 4379 return true; 4380 4381 return false; 4382 } 4383 4384 void netdev_core_stats_inc(struct net_device *dev, u32 offset); 4385 4386 #define DEV_CORE_STATS_INC(FIELD) \ 4387 static inline void dev_core_stats_##FIELD##_inc(struct net_device *dev) \ 4388 { \ 4389 netdev_core_stats_inc(dev, \ 4390 offsetof(struct net_device_core_stats, FIELD)); \ 4391 } 4392 DEV_CORE_STATS_INC(rx_dropped) 4393 DEV_CORE_STATS_INC(tx_dropped) 4394 DEV_CORE_STATS_INC(rx_nohandler) 4395 DEV_CORE_STATS_INC(rx_otherhost_dropped) 4396 #undef DEV_CORE_STATS_INC 4397 4398 static __always_inline int ____dev_forward_skb(struct net_device *dev, 4399 struct sk_buff *skb, 4400 const bool check_mtu) 4401 { 4402 if (skb_orphan_frags(skb, GFP_ATOMIC) || 4403 unlikely(!__is_skb_forwardable(dev, skb, check_mtu))) { 4404 dev_core_stats_rx_dropped_inc(dev); 4405 kfree_skb(skb); 4406 return NET_RX_DROP; 4407 } 4408 4409 skb_scrub_packet(skb, !net_eq(dev_net(dev), dev_net(skb->dev))); 4410 skb->priority = 0; 4411 return 0; 4412 } 4413 4414 bool dev_nit_active_rcu(const struct net_device *dev); 4415 static inline bool dev_nit_active(const struct net_device *dev) 4416 { 4417 bool ret; 4418 4419 rcu_read_lock(); 4420 ret = dev_nit_active_rcu(dev); 4421 rcu_read_unlock(); 4422 return ret; 4423 } 4424 4425 void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev); 4426 4427 static inline void __dev_put(struct net_device *dev) 4428 { 4429 if (dev) { 4430 #ifdef CONFIG_PCPU_DEV_REFCNT 4431 this_cpu_dec(*dev->pcpu_refcnt); 4432 #else 4433 refcount_dec(&dev->dev_refcnt); 4434 #endif 4435 } 4436 } 4437 4438 static inline void __dev_hold(struct net_device *dev) 4439 { 4440 if (dev) { 4441 #ifdef CONFIG_PCPU_DEV_REFCNT 4442 this_cpu_inc(*dev->pcpu_refcnt); 4443 #else 4444 refcount_inc(&dev->dev_refcnt); 4445 #endif 4446 } 4447 } 4448 4449 static inline void __netdev_tracker_alloc(struct net_device *dev, 4450 netdevice_tracker *tracker, 4451 gfp_t gfp) 4452 { 4453 #ifdef CONFIG_NET_DEV_REFCNT_TRACKER 4454 ref_tracker_alloc(&dev->refcnt_tracker, tracker, gfp); 4455 #endif 4456 } 4457 4458 /* netdev_tracker_alloc() can upgrade a prior untracked reference 4459 * taken by dev_get_by_name()/dev_get_by_index() to a tracked one. 4460 */ 4461 static inline void netdev_tracker_alloc(struct net_device *dev, 4462 netdevice_tracker *tracker, gfp_t gfp) 4463 { 4464 #ifdef CONFIG_NET_DEV_REFCNT_TRACKER 4465 refcount_dec(&dev->refcnt_tracker.no_tracker); 4466 __netdev_tracker_alloc(dev, tracker, gfp); 4467 #endif 4468 } 4469 4470 static inline void netdev_tracker_free(struct net_device *dev, 4471 netdevice_tracker *tracker) 4472 { 4473 #ifdef CONFIG_NET_DEV_REFCNT_TRACKER 4474 ref_tracker_free(&dev->refcnt_tracker, tracker); 4475 #endif 4476 } 4477 4478 static inline void netdev_hold(struct net_device *dev, 4479 netdevice_tracker *tracker, gfp_t gfp) 4480 { 4481 if (dev) { 4482 __dev_hold(dev); 4483 __netdev_tracker_alloc(dev, tracker, gfp); 4484 } 4485 } 4486 4487 static inline void netdev_put(struct net_device *dev, 4488 netdevice_tracker *tracker) 4489 { 4490 if (dev) { 4491 netdev_tracker_free(dev, tracker); 4492 __dev_put(dev); 4493 } 4494 } 4495 4496 /** 4497 * dev_hold - get reference to device 4498 * @dev: network device 4499 * 4500 * Hold reference to device to keep it from being freed. 4501 * Try using netdev_hold() instead. 4502 */ 4503 static inline void dev_hold(struct net_device *dev) 4504 { 4505 netdev_hold(dev, NULL, GFP_ATOMIC); 4506 } 4507 4508 /** 4509 * dev_put - release reference to device 4510 * @dev: network device 4511 * 4512 * Release reference to device to allow it to be freed. 4513 * Try using netdev_put() instead. 4514 */ 4515 static inline void dev_put(struct net_device *dev) 4516 { 4517 netdev_put(dev, NULL); 4518 } 4519 4520 DEFINE_FREE(dev_put, struct net_device *, if (_T) dev_put(_T)) 4521 4522 static inline void netdev_ref_replace(struct net_device *odev, 4523 struct net_device *ndev, 4524 netdevice_tracker *tracker, 4525 gfp_t gfp) 4526 { 4527 if (odev) 4528 netdev_tracker_free(odev, tracker); 4529 4530 __dev_hold(ndev); 4531 __dev_put(odev); 4532 4533 if (ndev) 4534 __netdev_tracker_alloc(ndev, tracker, gfp); 4535 } 4536 4537 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 4538 * and _off may be called from IRQ context, but it is caller 4539 * who is responsible for serialization of these calls. 4540 * 4541 * The name carrier is inappropriate, these functions should really be 4542 * called netif_lowerlayer_*() because they represent the state of any 4543 * kind of lower layer not just hardware media. 4544 */ 4545 void linkwatch_fire_event(struct net_device *dev); 4546 4547 /** 4548 * linkwatch_sync_dev - sync linkwatch for the given device 4549 * @dev: network device to sync linkwatch for 4550 * 4551 * Sync linkwatch for the given device, removing it from the 4552 * pending work list (if queued). 4553 */ 4554 void linkwatch_sync_dev(struct net_device *dev); 4555 void __linkwatch_sync_dev(struct net_device *dev); 4556 4557 /** 4558 * netif_carrier_ok - test if carrier present 4559 * @dev: network device 4560 * 4561 * Check if carrier is present on device 4562 */ 4563 static inline bool netif_carrier_ok(const struct net_device *dev) 4564 { 4565 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 4566 } 4567 4568 unsigned long dev_trans_start(struct net_device *dev); 4569 4570 void netdev_watchdog_up(struct net_device *dev); 4571 4572 void netif_carrier_on(struct net_device *dev); 4573 void netif_carrier_off(struct net_device *dev); 4574 void netif_carrier_event(struct net_device *dev); 4575 4576 /** 4577 * netif_dormant_on - mark device as dormant. 4578 * @dev: network device 4579 * 4580 * Mark device as dormant (as per RFC2863). 4581 * 4582 * The dormant state indicates that the relevant interface is not 4583 * actually in a condition to pass packets (i.e., it is not 'up') but is 4584 * in a "pending" state, waiting for some external event. For "on- 4585 * demand" interfaces, this new state identifies the situation where the 4586 * interface is waiting for events to place it in the up state. 4587 */ 4588 static inline void netif_dormant_on(struct net_device *dev) 4589 { 4590 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 4591 linkwatch_fire_event(dev); 4592 } 4593 4594 /** 4595 * netif_dormant_off - set device as not dormant. 4596 * @dev: network device 4597 * 4598 * Device is not in dormant state. 4599 */ 4600 static inline void netif_dormant_off(struct net_device *dev) 4601 { 4602 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 4603 linkwatch_fire_event(dev); 4604 } 4605 4606 /** 4607 * netif_dormant - test if device is dormant 4608 * @dev: network device 4609 * 4610 * Check if device is dormant. 4611 */ 4612 static inline bool netif_dormant(const struct net_device *dev) 4613 { 4614 return test_bit(__LINK_STATE_DORMANT, &dev->state); 4615 } 4616 4617 4618 /** 4619 * netif_testing_on - mark device as under test. 4620 * @dev: network device 4621 * 4622 * Mark device as under test (as per RFC2863). 4623 * 4624 * The testing state indicates that some test(s) must be performed on 4625 * the interface. After completion, of the test, the interface state 4626 * will change to up, dormant, or down, as appropriate. 4627 */ 4628 static inline void netif_testing_on(struct net_device *dev) 4629 { 4630 if (!test_and_set_bit(__LINK_STATE_TESTING, &dev->state)) 4631 linkwatch_fire_event(dev); 4632 } 4633 4634 /** 4635 * netif_testing_off - set device as not under test. 4636 * @dev: network device 4637 * 4638 * Device is not in testing state. 4639 */ 4640 static inline void netif_testing_off(struct net_device *dev) 4641 { 4642 if (test_and_clear_bit(__LINK_STATE_TESTING, &dev->state)) 4643 linkwatch_fire_event(dev); 4644 } 4645 4646 /** 4647 * netif_testing - test if device is under test 4648 * @dev: network device 4649 * 4650 * Check if device is under test 4651 */ 4652 static inline bool netif_testing(const struct net_device *dev) 4653 { 4654 return test_bit(__LINK_STATE_TESTING, &dev->state); 4655 } 4656 4657 4658 /** 4659 * netif_oper_up - test if device is operational 4660 * @dev: network device 4661 * 4662 * Check if carrier is operational 4663 */ 4664 static inline bool netif_oper_up(const struct net_device *dev) 4665 { 4666 unsigned int operstate = READ_ONCE(dev->operstate); 4667 4668 return operstate == IF_OPER_UP || 4669 operstate == IF_OPER_UNKNOWN /* backward compat */; 4670 } 4671 4672 /** 4673 * netif_device_present - is device available or removed 4674 * @dev: network device 4675 * 4676 * Check if device has not been removed from system. 4677 */ 4678 static inline bool netif_device_present(const struct net_device *dev) 4679 { 4680 return test_bit(__LINK_STATE_PRESENT, &dev->state); 4681 } 4682 4683 void netif_device_detach(struct net_device *dev); 4684 4685 void netif_device_attach(struct net_device *dev); 4686 4687 /* 4688 * Network interface message level settings 4689 */ 4690 4691 enum { 4692 NETIF_MSG_DRV_BIT, 4693 NETIF_MSG_PROBE_BIT, 4694 NETIF_MSG_LINK_BIT, 4695 NETIF_MSG_TIMER_BIT, 4696 NETIF_MSG_IFDOWN_BIT, 4697 NETIF_MSG_IFUP_BIT, 4698 NETIF_MSG_RX_ERR_BIT, 4699 NETIF_MSG_TX_ERR_BIT, 4700 NETIF_MSG_TX_QUEUED_BIT, 4701 NETIF_MSG_INTR_BIT, 4702 NETIF_MSG_TX_DONE_BIT, 4703 NETIF_MSG_RX_STATUS_BIT, 4704 NETIF_MSG_PKTDATA_BIT, 4705 NETIF_MSG_HW_BIT, 4706 NETIF_MSG_WOL_BIT, 4707 4708 /* When you add a new bit above, update netif_msg_class_names array 4709 * in net/ethtool/common.c 4710 */ 4711 NETIF_MSG_CLASS_COUNT, 4712 }; 4713 /* Both ethtool_ops interface and internal driver implementation use u32 */ 4714 static_assert(NETIF_MSG_CLASS_COUNT <= 32); 4715 4716 #define __NETIF_MSG_BIT(bit) ((u32)1 << (bit)) 4717 #define __NETIF_MSG(name) __NETIF_MSG_BIT(NETIF_MSG_ ## name ## _BIT) 4718 4719 #define NETIF_MSG_DRV __NETIF_MSG(DRV) 4720 #define NETIF_MSG_PROBE __NETIF_MSG(PROBE) 4721 #define NETIF_MSG_LINK __NETIF_MSG(LINK) 4722 #define NETIF_MSG_TIMER __NETIF_MSG(TIMER) 4723 #define NETIF_MSG_IFDOWN __NETIF_MSG(IFDOWN) 4724 #define NETIF_MSG_IFUP __NETIF_MSG(IFUP) 4725 #define NETIF_MSG_RX_ERR __NETIF_MSG(RX_ERR) 4726 #define NETIF_MSG_TX_ERR __NETIF_MSG(TX_ERR) 4727 #define NETIF_MSG_TX_QUEUED __NETIF_MSG(TX_QUEUED) 4728 #define NETIF_MSG_INTR __NETIF_MSG(INTR) 4729 #define NETIF_MSG_TX_DONE __NETIF_MSG(TX_DONE) 4730 #define NETIF_MSG_RX_STATUS __NETIF_MSG(RX_STATUS) 4731 #define NETIF_MSG_PKTDATA __NETIF_MSG(PKTDATA) 4732 #define NETIF_MSG_HW __NETIF_MSG(HW) 4733 #define NETIF_MSG_WOL __NETIF_MSG(WOL) 4734 4735 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 4736 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 4737 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 4738 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 4739 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 4740 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 4741 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 4742 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 4743 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 4744 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 4745 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 4746 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 4747 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 4748 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 4749 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 4750 4751 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 4752 { 4753 /* use default */ 4754 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 4755 return default_msg_enable_bits; 4756 if (debug_value == 0) /* no output */ 4757 return 0; 4758 /* set low N bits */ 4759 return (1U << debug_value) - 1; 4760 } 4761 4762 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu) 4763 { 4764 spin_lock(&txq->_xmit_lock); 4765 /* Pairs with READ_ONCE() in netif_tx_owned() */ 4766 WRITE_ONCE(txq->xmit_lock_owner, cpu); 4767 } 4768 4769 static inline bool __netif_tx_acquire(struct netdev_queue *txq) 4770 { 4771 __acquire(&txq->_xmit_lock); 4772 return true; 4773 } 4774 4775 static inline void __netif_tx_release(struct netdev_queue *txq) 4776 { 4777 __release(&txq->_xmit_lock); 4778 } 4779 4780 static inline void __netif_tx_lock_bh(struct netdev_queue *txq) 4781 { 4782 spin_lock_bh(&txq->_xmit_lock); 4783 /* Pairs with READ_ONCE() in netif_tx_owned() */ 4784 WRITE_ONCE(txq->xmit_lock_owner, smp_processor_id()); 4785 } 4786 4787 static inline bool __netif_tx_trylock(struct netdev_queue *txq) 4788 { 4789 bool ok = spin_trylock(&txq->_xmit_lock); 4790 4791 if (likely(ok)) { 4792 /* Pairs with READ_ONCE() in netif_tx_owned() */ 4793 WRITE_ONCE(txq->xmit_lock_owner, smp_processor_id()); 4794 } 4795 return ok; 4796 } 4797 4798 static inline void __netif_tx_unlock(struct netdev_queue *txq) 4799 { 4800 /* Pairs with READ_ONCE() in netif_tx_owned() */ 4801 WRITE_ONCE(txq->xmit_lock_owner, -1); 4802 spin_unlock(&txq->_xmit_lock); 4803 } 4804 4805 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq) 4806 { 4807 /* Pairs with READ_ONCE() in netif_tx_owned() */ 4808 WRITE_ONCE(txq->xmit_lock_owner, -1); 4809 spin_unlock_bh(&txq->_xmit_lock); 4810 } 4811 4812 /* 4813 * txq->trans_start can be read locklessly from dev_watchdog() 4814 */ 4815 static inline void txq_trans_update(const struct net_device *dev, 4816 struct netdev_queue *txq) 4817 { 4818 if (!dev->lltx) 4819 WRITE_ONCE(txq->trans_start, jiffies); 4820 } 4821 4822 static inline void txq_trans_cond_update(struct netdev_queue *txq) 4823 { 4824 unsigned long now = jiffies; 4825 4826 if (READ_ONCE(txq->trans_start) != now) 4827 WRITE_ONCE(txq->trans_start, now); 4828 } 4829 4830 /* legacy drivers only, netdev_start_xmit() sets txq->trans_start */ 4831 static inline void netif_trans_update(struct net_device *dev) 4832 { 4833 struct netdev_queue *txq = netdev_get_tx_queue(dev, 0); 4834 4835 txq_trans_cond_update(txq); 4836 } 4837 4838 /** 4839 * netif_tx_lock - grab network device transmit lock 4840 * @dev: network device 4841 * 4842 * Get network device transmit lock 4843 */ 4844 void netif_tx_lock(struct net_device *dev); 4845 4846 static inline void netif_tx_lock_bh(struct net_device *dev) 4847 { 4848 local_bh_disable(); 4849 netif_tx_lock(dev); 4850 } 4851 4852 void netif_tx_unlock(struct net_device *dev); 4853 4854 static inline void netif_tx_unlock_bh(struct net_device *dev) 4855 { 4856 netif_tx_unlock(dev); 4857 local_bh_enable(); 4858 } 4859 4860 #define HARD_TX_LOCK(dev, txq, cpu) { \ 4861 if (!(dev)->lltx) { \ 4862 __netif_tx_lock(txq, cpu); \ 4863 } else { \ 4864 __netif_tx_acquire(txq); \ 4865 } \ 4866 } 4867 4868 #define HARD_TX_TRYLOCK(dev, txq) \ 4869 (!(dev)->lltx ? \ 4870 __netif_tx_trylock(txq) : \ 4871 __netif_tx_acquire(txq)) 4872 4873 #define HARD_TX_UNLOCK(dev, txq) { \ 4874 if (!(dev)->lltx) { \ 4875 __netif_tx_unlock(txq); \ 4876 } else { \ 4877 __netif_tx_release(txq); \ 4878 } \ 4879 } 4880 4881 static inline void netif_tx_disable(struct net_device *dev) 4882 { 4883 unsigned int i; 4884 int cpu; 4885 4886 local_bh_disable(); 4887 cpu = smp_processor_id(); 4888 spin_lock(&dev->tx_global_lock); 4889 for (i = 0; i < dev->num_tx_queues; i++) { 4890 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 4891 4892 __netif_tx_lock(txq, cpu); 4893 netif_tx_stop_queue(txq); 4894 __netif_tx_unlock(txq); 4895 } 4896 spin_unlock(&dev->tx_global_lock); 4897 local_bh_enable(); 4898 } 4899 4900 #ifndef CONFIG_PREEMPT_RT 4901 static inline bool netif_tx_owned(struct netdev_queue *txq, unsigned int cpu) 4902 { 4903 /* Other cpus might concurrently change txq->xmit_lock_owner 4904 * to -1 or to their cpu id, but not to our id. 4905 */ 4906 return READ_ONCE(txq->xmit_lock_owner) == cpu; 4907 } 4908 4909 #else 4910 static inline bool netif_tx_owned(struct netdev_queue *txq, unsigned int cpu) 4911 { 4912 return rt_mutex_owner(&txq->_xmit_lock.lock) == current; 4913 } 4914 4915 #endif 4916 4917 static inline void netif_addr_lock(struct net_device *dev) 4918 { 4919 unsigned char nest_level = 0; 4920 4921 #ifdef CONFIG_LOCKDEP 4922 nest_level = dev->nested_level; 4923 #endif 4924 spin_lock_nested(&dev->addr_list_lock, nest_level); 4925 } 4926 4927 static inline void netif_addr_lock_bh(struct net_device *dev) 4928 { 4929 unsigned char nest_level = 0; 4930 4931 #ifdef CONFIG_LOCKDEP 4932 nest_level = dev->nested_level; 4933 #endif 4934 local_bh_disable(); 4935 spin_lock_nested(&dev->addr_list_lock, nest_level); 4936 } 4937 4938 static inline void netif_addr_unlock(struct net_device *dev) 4939 { 4940 spin_unlock(&dev->addr_list_lock); 4941 } 4942 4943 static inline void netif_addr_unlock_bh(struct net_device *dev) 4944 { 4945 spin_unlock_bh(&dev->addr_list_lock); 4946 } 4947 4948 /* 4949 * dev_addrs walker. Should be used only for read access. Call with 4950 * rcu_read_lock held. 4951 */ 4952 #define for_each_dev_addr(dev, ha) \ 4953 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list) 4954 4955 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 4956 4957 void ether_setup(struct net_device *dev); 4958 4959 /* Allocate dummy net_device */ 4960 struct net_device *alloc_netdev_dummy(int sizeof_priv); 4961 4962 /* Support for loadable net-drivers */ 4963 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, 4964 unsigned char name_assign_type, 4965 void (*setup)(struct net_device *), 4966 unsigned int txqs, unsigned int rxqs); 4967 #define alloc_netdev(sizeof_priv, name, name_assign_type, setup) \ 4968 alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, 1, 1) 4969 4970 #define alloc_netdev_mq(sizeof_priv, name, name_assign_type, setup, count) \ 4971 alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, count, \ 4972 count) 4973 4974 int register_netdev(struct net_device *dev); 4975 void unregister_netdev(struct net_device *dev); 4976 4977 int devm_register_netdev(struct device *dev, struct net_device *ndev); 4978 4979 /* General hardware address lists handling functions */ 4980 int __hw_addr_sync(struct netdev_hw_addr_list *to_list, 4981 struct netdev_hw_addr_list *from_list, int addr_len); 4982 int __hw_addr_sync_multiple(struct netdev_hw_addr_list *to_list, 4983 struct netdev_hw_addr_list *from_list, 4984 int addr_len); 4985 void __hw_addr_unsync(struct netdev_hw_addr_list *to_list, 4986 struct netdev_hw_addr_list *from_list, int addr_len); 4987 int __hw_addr_sync_dev(struct netdev_hw_addr_list *list, 4988 struct net_device *dev, 4989 int (*sync)(struct net_device *, const unsigned char *), 4990 int (*unsync)(struct net_device *, 4991 const unsigned char *)); 4992 int __hw_addr_ref_sync_dev(struct netdev_hw_addr_list *list, 4993 struct net_device *dev, 4994 int (*sync)(struct net_device *, 4995 const unsigned char *, int), 4996 int (*unsync)(struct net_device *, 4997 const unsigned char *, int)); 4998 void __hw_addr_ref_unsync_dev(struct netdev_hw_addr_list *list, 4999 struct net_device *dev, 5000 int (*unsync)(struct net_device *, 5001 const unsigned char *, int)); 5002 void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list, 5003 struct net_device *dev, 5004 int (*unsync)(struct net_device *, 5005 const unsigned char *)); 5006 void __hw_addr_init(struct netdev_hw_addr_list *list); 5007 5008 /* Functions used for device addresses handling */ 5009 void dev_addr_mod(struct net_device *dev, unsigned int offset, 5010 const void *addr, size_t len); 5011 5012 static inline void 5013 __dev_addr_set(struct net_device *dev, const void *addr, size_t len) 5014 { 5015 dev_addr_mod(dev, 0, addr, len); 5016 } 5017 5018 static inline void dev_addr_set(struct net_device *dev, const u8 *addr) 5019 { 5020 __dev_addr_set(dev, addr, dev->addr_len); 5021 } 5022 5023 int dev_addr_add(struct net_device *dev, const unsigned char *addr, 5024 unsigned char addr_type); 5025 int dev_addr_del(struct net_device *dev, const unsigned char *addr, 5026 unsigned char addr_type); 5027 5028 /* Functions used for unicast addresses handling */ 5029 int dev_uc_add(struct net_device *dev, const unsigned char *addr); 5030 int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr); 5031 int dev_uc_del(struct net_device *dev, const unsigned char *addr); 5032 int dev_uc_sync(struct net_device *to, struct net_device *from); 5033 int dev_uc_sync_multiple(struct net_device *to, struct net_device *from); 5034 void dev_uc_unsync(struct net_device *to, struct net_device *from); 5035 void dev_uc_flush(struct net_device *dev); 5036 void dev_uc_init(struct net_device *dev); 5037 5038 /** 5039 * __dev_uc_sync - Synchronize device's unicast list 5040 * @dev: device to sync 5041 * @sync: function to call if address should be added 5042 * @unsync: function to call if address should be removed 5043 * 5044 * Add newly added addresses to the interface, and release 5045 * addresses that have been deleted. 5046 */ 5047 static inline int __dev_uc_sync(struct net_device *dev, 5048 int (*sync)(struct net_device *, 5049 const unsigned char *), 5050 int (*unsync)(struct net_device *, 5051 const unsigned char *)) 5052 { 5053 return __hw_addr_sync_dev(&dev->uc, dev, sync, unsync); 5054 } 5055 5056 /** 5057 * __dev_uc_unsync - Remove synchronized addresses from device 5058 * @dev: device to sync 5059 * @unsync: function to call if address should be removed 5060 * 5061 * Remove all addresses that were added to the device by dev_uc_sync(). 5062 */ 5063 static inline void __dev_uc_unsync(struct net_device *dev, 5064 int (*unsync)(struct net_device *, 5065 const unsigned char *)) 5066 { 5067 __hw_addr_unsync_dev(&dev->uc, dev, unsync); 5068 } 5069 5070 /* Functions used for multicast addresses handling */ 5071 int dev_mc_add(struct net_device *dev, const unsigned char *addr); 5072 int dev_mc_add_global(struct net_device *dev, const unsigned char *addr); 5073 int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr); 5074 int dev_mc_del(struct net_device *dev, const unsigned char *addr); 5075 int dev_mc_del_global(struct net_device *dev, const unsigned char *addr); 5076 int dev_mc_sync(struct net_device *to, struct net_device *from); 5077 int dev_mc_sync_multiple(struct net_device *to, struct net_device *from); 5078 void dev_mc_unsync(struct net_device *to, struct net_device *from); 5079 void dev_mc_flush(struct net_device *dev); 5080 void dev_mc_init(struct net_device *dev); 5081 5082 /** 5083 * __dev_mc_sync - Synchronize device's multicast list 5084 * @dev: device to sync 5085 * @sync: function to call if address should be added 5086 * @unsync: function to call if address should be removed 5087 * 5088 * Add newly added addresses to the interface, and release 5089 * addresses that have been deleted. 5090 */ 5091 static inline int __dev_mc_sync(struct net_device *dev, 5092 int (*sync)(struct net_device *, 5093 const unsigned char *), 5094 int (*unsync)(struct net_device *, 5095 const unsigned char *)) 5096 { 5097 return __hw_addr_sync_dev(&dev->mc, dev, sync, unsync); 5098 } 5099 5100 /** 5101 * __dev_mc_unsync - Remove synchronized addresses from device 5102 * @dev: device to sync 5103 * @unsync: function to call if address should be removed 5104 * 5105 * Remove all addresses that were added to the device by dev_mc_sync(). 5106 */ 5107 static inline void __dev_mc_unsync(struct net_device *dev, 5108 int (*unsync)(struct net_device *, 5109 const unsigned char *)) 5110 { 5111 __hw_addr_unsync_dev(&dev->mc, dev, unsync); 5112 } 5113 5114 /* Functions used for secondary unicast and multicast support */ 5115 void dev_set_rx_mode(struct net_device *dev); 5116 int netif_set_promiscuity(struct net_device *dev, int inc); 5117 int dev_set_promiscuity(struct net_device *dev, int inc); 5118 int netif_set_allmulti(struct net_device *dev, int inc, bool notify); 5119 int dev_set_allmulti(struct net_device *dev, int inc); 5120 void netif_state_change(struct net_device *dev); 5121 void netdev_state_change(struct net_device *dev); 5122 void __netdev_notify_peers(struct net_device *dev); 5123 void netdev_notify_peers(struct net_device *dev); 5124 void netdev_features_change(struct net_device *dev); 5125 /* Load a device via the kmod */ 5126 void dev_load(struct net *net, const char *name); 5127 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, 5128 struct rtnl_link_stats64 *storage); 5129 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, 5130 const struct net_device_stats *netdev_stats); 5131 void dev_fetch_sw_netstats(struct rtnl_link_stats64 *s, 5132 const struct pcpu_sw_netstats __percpu *netstats); 5133 void dev_get_tstats64(struct net_device *dev, struct rtnl_link_stats64 *s); 5134 5135 enum { 5136 NESTED_SYNC_IMM_BIT, 5137 NESTED_SYNC_TODO_BIT, 5138 }; 5139 5140 #define __NESTED_SYNC_BIT(bit) ((u32)1 << (bit)) 5141 #define __NESTED_SYNC(name) __NESTED_SYNC_BIT(NESTED_SYNC_ ## name ## _BIT) 5142 5143 #define NESTED_SYNC_IMM __NESTED_SYNC(IMM) 5144 #define NESTED_SYNC_TODO __NESTED_SYNC(TODO) 5145 5146 struct netdev_nested_priv { 5147 unsigned char flags; 5148 void *data; 5149 }; 5150 5151 bool netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev); 5152 struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, 5153 struct list_head **iter); 5154 5155 /* iterate through upper list, must be called under RCU read lock */ 5156 #define netdev_for_each_upper_dev_rcu(dev, updev, iter) \ 5157 for (iter = &(dev)->adj_list.upper, \ 5158 updev = netdev_upper_get_next_dev_rcu(dev, &(iter)); \ 5159 updev; \ 5160 updev = netdev_upper_get_next_dev_rcu(dev, &(iter))) 5161 5162 int netdev_walk_all_upper_dev_rcu(struct net_device *dev, 5163 int (*fn)(struct net_device *upper_dev, 5164 struct netdev_nested_priv *priv), 5165 struct netdev_nested_priv *priv); 5166 5167 bool netdev_has_upper_dev_all_rcu(struct net_device *dev, 5168 struct net_device *upper_dev); 5169 5170 bool netdev_has_any_upper_dev(struct net_device *dev); 5171 5172 void *netdev_lower_get_next_private(struct net_device *dev, 5173 struct list_head **iter); 5174 void *netdev_lower_get_next_private_rcu(struct net_device *dev, 5175 struct list_head **iter); 5176 5177 #define netdev_for_each_lower_private(dev, priv, iter) \ 5178 for (iter = (dev)->adj_list.lower.next, \ 5179 priv = netdev_lower_get_next_private(dev, &(iter)); \ 5180 priv; \ 5181 priv = netdev_lower_get_next_private(dev, &(iter))) 5182 5183 #define netdev_for_each_lower_private_rcu(dev, priv, iter) \ 5184 for (iter = &(dev)->adj_list.lower, \ 5185 priv = netdev_lower_get_next_private_rcu(dev, &(iter)); \ 5186 priv; \ 5187 priv = netdev_lower_get_next_private_rcu(dev, &(iter))) 5188 5189 void *netdev_lower_get_next(struct net_device *dev, 5190 struct list_head **iter); 5191 5192 #define netdev_for_each_lower_dev(dev, ldev, iter) \ 5193 for (iter = (dev)->adj_list.lower.next, \ 5194 ldev = netdev_lower_get_next(dev, &(iter)); \ 5195 ldev; \ 5196 ldev = netdev_lower_get_next(dev, &(iter))) 5197 5198 struct net_device *netdev_next_lower_dev_rcu(struct net_device *dev, 5199 struct list_head **iter); 5200 int netdev_walk_all_lower_dev(struct net_device *dev, 5201 int (*fn)(struct net_device *lower_dev, 5202 struct netdev_nested_priv *priv), 5203 struct netdev_nested_priv *priv); 5204 int netdev_walk_all_lower_dev_rcu(struct net_device *dev, 5205 int (*fn)(struct net_device *lower_dev, 5206 struct netdev_nested_priv *priv), 5207 struct netdev_nested_priv *priv); 5208 5209 void *netdev_adjacent_get_private(struct list_head *adj_list); 5210 void *netdev_lower_get_first_private_rcu(struct net_device *dev); 5211 struct net_device *netdev_master_upper_dev_get(struct net_device *dev); 5212 struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev); 5213 int netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev, 5214 struct netlink_ext_ack *extack); 5215 int netdev_master_upper_dev_link(struct net_device *dev, 5216 struct net_device *upper_dev, 5217 void *upper_priv, void *upper_info, 5218 struct netlink_ext_ack *extack); 5219 void netdev_upper_dev_unlink(struct net_device *dev, 5220 struct net_device *upper_dev); 5221 int netdev_adjacent_change_prepare(struct net_device *old_dev, 5222 struct net_device *new_dev, 5223 struct net_device *dev, 5224 struct netlink_ext_ack *extack); 5225 void netdev_adjacent_change_commit(struct net_device *old_dev, 5226 struct net_device *new_dev, 5227 struct net_device *dev); 5228 void netdev_adjacent_change_abort(struct net_device *old_dev, 5229 struct net_device *new_dev, 5230 struct net_device *dev); 5231 void netdev_adjacent_rename_links(struct net_device *dev, char *oldname); 5232 void *netdev_lower_dev_get_private(struct net_device *dev, 5233 struct net_device *lower_dev); 5234 void netdev_lower_state_changed(struct net_device *lower_dev, 5235 void *lower_state_info); 5236 5237 #define NETDEV_RSS_KEY_LEN 256 5238 extern u8 netdev_rss_key[NETDEV_RSS_KEY_LEN] __read_mostly; 5239 void netdev_rss_key_fill(void *buffer, size_t len); 5240 5241 int skb_checksum_help(struct sk_buff *skb); 5242 int skb_crc32c_csum_help(struct sk_buff *skb); 5243 int skb_csum_hwoffload_help(struct sk_buff *skb, 5244 const netdev_features_t features); 5245 5246 struct netdev_bonding_info { 5247 ifslave slave; 5248 ifbond master; 5249 }; 5250 5251 struct netdev_notifier_bonding_info { 5252 struct netdev_notifier_info info; /* must be first */ 5253 struct netdev_bonding_info bonding_info; 5254 }; 5255 5256 void netdev_bonding_info_change(struct net_device *dev, 5257 struct netdev_bonding_info *bonding_info); 5258 5259 #if IS_ENABLED(CONFIG_ETHTOOL_NETLINK) 5260 void ethtool_notify(struct net_device *dev, unsigned int cmd); 5261 #else 5262 static inline void ethtool_notify(struct net_device *dev, unsigned int cmd) 5263 { 5264 } 5265 #endif 5266 5267 __be16 skb_network_protocol(struct sk_buff *skb, int *depth); 5268 5269 static inline bool can_checksum_protocol(netdev_features_t features, 5270 __be16 protocol) 5271 { 5272 if (protocol == htons(ETH_P_FCOE)) 5273 return !!(features & NETIF_F_FCOE_CRC); 5274 5275 /* Assume this is an IP checksum (not SCTP CRC) */ 5276 5277 if (features & NETIF_F_HW_CSUM) { 5278 /* Can checksum everything */ 5279 return true; 5280 } 5281 5282 switch (protocol) { 5283 case htons(ETH_P_IP): 5284 return !!(features & NETIF_F_IP_CSUM); 5285 case htons(ETH_P_IPV6): 5286 return !!(features & NETIF_F_IPV6_CSUM); 5287 default: 5288 return false; 5289 } 5290 } 5291 5292 #ifdef CONFIG_BUG 5293 void netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb); 5294 #else 5295 static inline void netdev_rx_csum_fault(struct net_device *dev, 5296 struct sk_buff *skb) 5297 { 5298 } 5299 #endif 5300 /* rx skb timestamps */ 5301 void net_enable_timestamp(void); 5302 void net_disable_timestamp(void); 5303 5304 static inline ktime_t netdev_get_tstamp(struct net_device *dev, 5305 const struct skb_shared_hwtstamps *hwtstamps, 5306 bool cycles) 5307 { 5308 const struct net_device_ops *ops = dev->netdev_ops; 5309 5310 if (ops->ndo_get_tstamp) 5311 return ops->ndo_get_tstamp(dev, hwtstamps, cycles); 5312 5313 return hwtstamps->hwtstamp; 5314 } 5315 5316 #ifndef CONFIG_PREEMPT_RT 5317 static inline void netdev_xmit_set_more(bool more) 5318 { 5319 __this_cpu_write(softnet_data.xmit.more, more); 5320 } 5321 5322 static inline bool netdev_xmit_more(void) 5323 { 5324 return __this_cpu_read(softnet_data.xmit.more); 5325 } 5326 #else 5327 static inline void netdev_xmit_set_more(bool more) 5328 { 5329 current->net_xmit.more = more; 5330 } 5331 5332 static inline bool netdev_xmit_more(void) 5333 { 5334 return current->net_xmit.more; 5335 } 5336 #endif 5337 5338 static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops, 5339 struct sk_buff *skb, struct net_device *dev, 5340 bool more) 5341 { 5342 netdev_xmit_set_more(more); 5343 return ops->ndo_start_xmit(skb, dev); 5344 } 5345 5346 static inline netdev_tx_t netdev_start_xmit(struct sk_buff *skb, struct net_device *dev, 5347 struct netdev_queue *txq, bool more) 5348 { 5349 const struct net_device_ops *ops = dev->netdev_ops; 5350 netdev_tx_t rc; 5351 5352 rc = __netdev_start_xmit(ops, skb, dev, more); 5353 if (rc == NETDEV_TX_OK) 5354 txq_trans_update(dev, txq); 5355 5356 return rc; 5357 } 5358 5359 int netdev_class_create_file_ns(const struct class_attribute *class_attr, 5360 const struct ns_common *ns); 5361 void netdev_class_remove_file_ns(const struct class_attribute *class_attr, 5362 const struct ns_common *ns); 5363 5364 extern const struct kobj_ns_type_operations net_ns_type_operations; 5365 5366 const char *netdev_drivername(const struct net_device *dev); 5367 5368 static inline netdev_features_t netdev_intersect_features(netdev_features_t f1, 5369 netdev_features_t f2) 5370 { 5371 if ((f1 ^ f2) & NETIF_F_HW_CSUM) { 5372 if (f1 & NETIF_F_HW_CSUM) 5373 f1 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); 5374 else 5375 f2 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); 5376 } 5377 5378 return f1 & f2; 5379 } 5380 5381 static inline netdev_features_t netdev_get_wanted_features( 5382 struct net_device *dev) 5383 { 5384 return (dev->features & ~dev->hw_features) | dev->wanted_features; 5385 } 5386 netdev_features_t netdev_increment_features(netdev_features_t all, 5387 netdev_features_t one, netdev_features_t mask); 5388 5389 /* Allow TSO being used on stacked device : 5390 * Performing the GSO segmentation before last device 5391 * is a performance improvement. 5392 */ 5393 static inline netdev_features_t netdev_add_tso_features(netdev_features_t features, 5394 netdev_features_t mask) 5395 { 5396 return netdev_increment_features(features, NETIF_F_ALL_TSO | 5397 NETIF_F_ALL_FOR_ALL, mask); 5398 } 5399 5400 int __netdev_update_features(struct net_device *dev); 5401 void netdev_update_features(struct net_device *dev); 5402 void netdev_change_features(struct net_device *dev); 5403 void netdev_compute_master_upper_features(struct net_device *dev, bool update_header); 5404 5405 void netif_stacked_transfer_operstate(const struct net_device *rootdev, 5406 struct net_device *dev); 5407 5408 netdev_features_t passthru_features_check(struct sk_buff *skb, 5409 struct net_device *dev, 5410 netdev_features_t features); 5411 netdev_features_t netif_skb_features(struct sk_buff *skb); 5412 void skb_warn_bad_offload(const struct sk_buff *skb); 5413 5414 static inline bool net_gso_ok(netdev_features_t features, int gso_type) 5415 { 5416 netdev_features_t feature; 5417 5418 if (gso_type & (SKB_GSO_TCP_FIXEDID | SKB_GSO_TCP_FIXEDID_INNER)) 5419 gso_type |= __SKB_GSO_TCP_FIXEDID; 5420 5421 feature = ((netdev_features_t)gso_type << NETIF_F_GSO_SHIFT) & NETIF_F_GSO_MASK; 5422 5423 /* check flags correspondence */ 5424 BUILD_BUG_ON(SKB_GSO_TCPV4 != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT)); 5425 BUILD_BUG_ON(SKB_GSO_DODGY != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT)); 5426 BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT)); 5427 BUILD_BUG_ON(__SKB_GSO_TCP_FIXEDID != (NETIF_F_TSO_MANGLEID >> NETIF_F_GSO_SHIFT)); 5428 BUILD_BUG_ON(SKB_GSO_TCPV6 != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT)); 5429 BUILD_BUG_ON(SKB_GSO_FCOE != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT)); 5430 BUILD_BUG_ON(SKB_GSO_GRE != (NETIF_F_GSO_GRE >> NETIF_F_GSO_SHIFT)); 5431 BUILD_BUG_ON(SKB_GSO_GRE_CSUM != (NETIF_F_GSO_GRE_CSUM >> NETIF_F_GSO_SHIFT)); 5432 BUILD_BUG_ON(SKB_GSO_IPXIP4 != (NETIF_F_GSO_IPXIP4 >> NETIF_F_GSO_SHIFT)); 5433 BUILD_BUG_ON(SKB_GSO_IPXIP6 != (NETIF_F_GSO_IPXIP6 >> NETIF_F_GSO_SHIFT)); 5434 BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL != (NETIF_F_GSO_UDP_TUNNEL >> NETIF_F_GSO_SHIFT)); 5435 BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL_CSUM != (NETIF_F_GSO_UDP_TUNNEL_CSUM >> NETIF_F_GSO_SHIFT)); 5436 BUILD_BUG_ON(SKB_GSO_PARTIAL != (NETIF_F_GSO_PARTIAL >> NETIF_F_GSO_SHIFT)); 5437 BUILD_BUG_ON(SKB_GSO_TUNNEL_REMCSUM != (NETIF_F_GSO_TUNNEL_REMCSUM >> NETIF_F_GSO_SHIFT)); 5438 BUILD_BUG_ON(SKB_GSO_SCTP != (NETIF_F_GSO_SCTP >> NETIF_F_GSO_SHIFT)); 5439 BUILD_BUG_ON(SKB_GSO_ESP != (NETIF_F_GSO_ESP >> NETIF_F_GSO_SHIFT)); 5440 BUILD_BUG_ON(SKB_GSO_UDP != (NETIF_F_GSO_UDP >> NETIF_F_GSO_SHIFT)); 5441 BUILD_BUG_ON(SKB_GSO_UDP_L4 != (NETIF_F_GSO_UDP_L4 >> NETIF_F_GSO_SHIFT)); 5442 BUILD_BUG_ON(SKB_GSO_FRAGLIST != (NETIF_F_GSO_FRAGLIST >> NETIF_F_GSO_SHIFT)); 5443 BUILD_BUG_ON(SKB_GSO_TCP_ACCECN != 5444 (NETIF_F_GSO_ACCECN >> NETIF_F_GSO_SHIFT)); 5445 5446 return (features & feature) == feature; 5447 } 5448 5449 static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features) 5450 { 5451 return net_gso_ok(features, skb_shinfo(skb)->gso_type) && 5452 (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST)); 5453 } 5454 5455 static inline bool netif_needs_gso(struct sk_buff *skb, 5456 netdev_features_t features) 5457 { 5458 return skb_is_gso(skb) && (!skb_gso_ok(skb, features) || 5459 unlikely((skb->ip_summed != CHECKSUM_PARTIAL) && 5460 (skb->ip_summed != CHECKSUM_UNNECESSARY))); 5461 } 5462 5463 void netif_set_tso_max_size(struct net_device *dev, unsigned int size); 5464 void netif_set_tso_max_segs(struct net_device *dev, unsigned int segs); 5465 void netif_inherit_tso_max(struct net_device *to, 5466 const struct net_device *from); 5467 5468 static inline unsigned int 5469 netif_get_gro_max_size(const struct net_device *dev, const struct sk_buff *skb) 5470 { 5471 /* pairs with WRITE_ONCE() in netif_set_gro(_ipv4)_max_size() */ 5472 return skb->protocol == htons(ETH_P_IPV6) ? 5473 READ_ONCE(dev->gro_max_size) : 5474 READ_ONCE(dev->gro_ipv4_max_size); 5475 } 5476 5477 static inline unsigned int 5478 netif_get_gso_max_size(const struct net_device *dev, const struct sk_buff *skb) 5479 { 5480 /* pairs with WRITE_ONCE() in netif_set_gso(_ipv4)_max_size() */ 5481 return skb->protocol == htons(ETH_P_IPV6) ? 5482 READ_ONCE(dev->gso_max_size) : 5483 READ_ONCE(dev->gso_ipv4_max_size); 5484 } 5485 5486 static inline bool netif_is_macsec(const struct net_device *dev) 5487 { 5488 return dev->priv_flags & IFF_MACSEC; 5489 } 5490 5491 static inline bool netif_is_macvlan(const struct net_device *dev) 5492 { 5493 return dev->priv_flags & IFF_MACVLAN; 5494 } 5495 5496 static inline bool netif_is_macvlan_port(const struct net_device *dev) 5497 { 5498 return dev->priv_flags & IFF_MACVLAN_PORT; 5499 } 5500 5501 static inline bool netif_is_bond_master(const struct net_device *dev) 5502 { 5503 return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING; 5504 } 5505 5506 static inline bool netif_is_bond_slave(const struct net_device *dev) 5507 { 5508 return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING; 5509 } 5510 5511 static inline bool netif_supports_nofcs(struct net_device *dev) 5512 { 5513 return dev->priv_flags & IFF_SUPP_NOFCS; 5514 } 5515 5516 static inline bool netif_has_l3_rx_handler(const struct net_device *dev) 5517 { 5518 return dev->priv_flags & IFF_L3MDEV_RX_HANDLER; 5519 } 5520 5521 static inline bool netif_is_l3_master(const struct net_device *dev) 5522 { 5523 return dev->priv_flags & IFF_L3MDEV_MASTER; 5524 } 5525 5526 static inline bool netif_is_l3_slave(const struct net_device *dev) 5527 { 5528 return dev->priv_flags & IFF_L3MDEV_SLAVE; 5529 } 5530 5531 static inline int dev_sdif(const struct net_device *dev) 5532 { 5533 #ifdef CONFIG_NET_L3_MASTER_DEV 5534 if (netif_is_l3_slave(dev)) 5535 return dev->ifindex; 5536 #endif 5537 return 0; 5538 } 5539 5540 static inline bool netif_is_bridge_master(const struct net_device *dev) 5541 { 5542 return dev->priv_flags & IFF_EBRIDGE; 5543 } 5544 5545 static inline bool netif_is_bridge_port(const struct net_device *dev) 5546 { 5547 return dev->priv_flags & IFF_BRIDGE_PORT; 5548 } 5549 5550 static inline bool netif_is_ovs_master(const struct net_device *dev) 5551 { 5552 return dev->priv_flags & IFF_OPENVSWITCH; 5553 } 5554 5555 static inline bool netif_is_ovs_port(const struct net_device *dev) 5556 { 5557 return dev->priv_flags & IFF_OVS_DATAPATH; 5558 } 5559 5560 static inline bool netif_is_any_bridge_master(const struct net_device *dev) 5561 { 5562 return netif_is_bridge_master(dev) || netif_is_ovs_master(dev); 5563 } 5564 5565 static inline bool netif_is_any_bridge_port(const struct net_device *dev) 5566 { 5567 return netif_is_bridge_port(dev) || netif_is_ovs_port(dev); 5568 } 5569 5570 static inline bool netif_is_team_master(const struct net_device *dev) 5571 { 5572 return dev->priv_flags & IFF_TEAM; 5573 } 5574 5575 static inline bool netif_is_team_port(const struct net_device *dev) 5576 { 5577 return dev->priv_flags & IFF_TEAM_PORT; 5578 } 5579 5580 static inline bool netif_is_lag_master(const struct net_device *dev) 5581 { 5582 return netif_is_bond_master(dev) || netif_is_team_master(dev); 5583 } 5584 5585 static inline bool netif_is_lag_port(const struct net_device *dev) 5586 { 5587 return netif_is_bond_slave(dev) || netif_is_team_port(dev); 5588 } 5589 5590 bool netif_is_rxfh_configured(const struct net_device *dev); 5591 5592 static inline bool netif_is_failover(const struct net_device *dev) 5593 { 5594 return dev->priv_flags & IFF_FAILOVER; 5595 } 5596 5597 static inline bool netif_is_failover_slave(const struct net_device *dev) 5598 { 5599 return dev->priv_flags & IFF_FAILOVER_SLAVE; 5600 } 5601 5602 /* This device needs to keep skb dst for qdisc enqueue or ndo_start_xmit() */ 5603 static inline void netif_keep_dst(struct net_device *dev) 5604 { 5605 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM); 5606 } 5607 5608 /* return true if dev can't cope with mtu frames that need vlan tag insertion */ 5609 static inline bool netif_reduces_vlan_mtu(struct net_device *dev) 5610 { 5611 /* TODO: reserve and use an additional IFF bit, if we get more users */ 5612 return netif_is_macsec(dev); 5613 } 5614 5615 extern struct pernet_operations __net_initdata loopback_net_ops; 5616 5617 /* Logging, debugging and troubleshooting/diagnostic helpers. */ 5618 5619 /* netdev_printk helpers, similar to dev_printk */ 5620 5621 static inline const char *netdev_name(const struct net_device *dev) 5622 { 5623 if (!dev->name[0] || strchr(dev->name, '%')) 5624 return "(unnamed net_device)"; 5625 return dev->name; 5626 } 5627 5628 static inline const char *netdev_reg_state(const struct net_device *dev) 5629 { 5630 u8 reg_state = READ_ONCE(dev->reg_state); 5631 5632 switch (reg_state) { 5633 case NETREG_UNINITIALIZED: return " (uninitialized)"; 5634 case NETREG_REGISTERED: return ""; 5635 case NETREG_UNREGISTERING: return " (unregistering)"; 5636 case NETREG_UNREGISTERED: return " (unregistered)"; 5637 case NETREG_RELEASED: return " (released)"; 5638 case NETREG_DUMMY: return " (dummy)"; 5639 } 5640 5641 WARN_ONCE(1, "%s: unknown reg_state %d\n", dev->name, reg_state); 5642 return " (unknown)"; 5643 } 5644 5645 #define MODULE_ALIAS_NETDEV(device) \ 5646 MODULE_ALIAS("netdev-" device) 5647 5648 /* 5649 * netdev_WARN() acts like dev_printk(), but with the key difference 5650 * of using a WARN/WARN_ON to get the message out, including the 5651 * file/line information and a backtrace. 5652 */ 5653 #define netdev_WARN(dev, format, args...) \ 5654 WARN(1, "netdevice: %s%s: " format, netdev_name(dev), \ 5655 netdev_reg_state(dev), ##args) 5656 5657 #define netdev_WARN_ONCE(dev, format, args...) \ 5658 WARN_ONCE(1, "netdevice: %s%s: " format, netdev_name(dev), \ 5659 netdev_reg_state(dev), ##args) 5660 5661 /* 5662 * The list of packet types we will receive (as opposed to discard) 5663 * and the routines to invoke. 5664 * 5665 * Why 16. Because with 16 the only overlap we get on a hash of the 5666 * low nibble of the protocol value is RARP/SNAP/X.25. 5667 * 5668 * 0800 IP 5669 * 0001 802.3 5670 * 0002 AX.25 5671 * 0004 802.2 5672 * 8035 RARP 5673 * 0005 SNAP 5674 * 0805 X.25 5675 * 0806 ARP 5676 * 8137 IPX 5677 * 0009 Localtalk 5678 * 86DD IPv6 5679 */ 5680 #define PTYPE_HASH_SIZE (16) 5681 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1) 5682 5683 extern struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; 5684 5685 extern struct net_device *blackhole_netdev; 5686 5687 /* Note: Avoid these macros in fast path, prefer per-cpu or per-queue counters. */ 5688 #define DEV_STATS_INC(DEV, FIELD) atomic_long_inc(&(DEV)->stats.__##FIELD) 5689 #define DEV_STATS_ADD(DEV, FIELD, VAL) \ 5690 atomic_long_add((VAL), &(DEV)->stats.__##FIELD) 5691 #define DEV_STATS_READ(DEV, FIELD) atomic_long_read(&(DEV)->stats.__##FIELD) 5692 5693 #endif /* _LINUX_NETDEVICE_H */ 5694