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, <[email protected]> 13 * Corey Minyard <[email protected]> 14 * Donald J. Becker, <[email protected]> 15 * Alan Cox, <[email protected]> 16 * Bjorn Ekwall. <[email protected]> 17 * Pekka Riikonen <[email protected]> 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 44 #include <linux/netdev_features.h> 45 #include <linux/neighbour.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 56 struct netpoll_info; 57 struct device; 58 struct ethtool_ops; 59 struct kernel_hwtstamp_config; 60 struct phy_device; 61 struct dsa_port; 62 struct ip_tunnel_parm; 63 struct macsec_context; 64 struct macsec_ops; 65 struct netdev_name_node; 66 struct sd_flow_limit; 67 struct sfp_bus; 68 /* 802.11 specific */ 69 struct wireless_dev; 70 /* 802.15.4 specific */ 71 struct wpan_dev; 72 struct mpls_dev; 73 /* UDP Tunnel offloads */ 74 struct udp_tunnel_info; 75 struct udp_tunnel_nic_info; 76 struct udp_tunnel_nic; 77 struct bpf_prog; 78 struct xdp_buff; 79 struct xdp_frame; 80 struct xdp_metadata_ops; 81 struct xdp_md; 82 /* DPLL specific */ 83 struct dpll_pin; 84 85 typedef u32 xdp_features_t; 86 87 void synchronize_net(void); 88 void netdev_set_default_ethtool_ops(struct net_device *dev, 89 const struct ethtool_ops *ops); 90 void netdev_sw_irq_coalesce_default_on(struct net_device *dev); 91 92 /* Backlog congestion levels */ 93 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */ 94 #define NET_RX_DROP 1 /* packet dropped */ 95 96 #define MAX_NEST_DEV 8 97 98 /* 99 * Transmit return codes: transmit return codes originate from three different 100 * namespaces: 101 * 102 * - qdisc return codes 103 * - driver transmit return codes 104 * - errno values 105 * 106 * Drivers are allowed to return any one of those in their hard_start_xmit() 107 * function. Real network devices commonly used with qdiscs should only return 108 * the driver transmit return codes though - when qdiscs are used, the actual 109 * transmission happens asynchronously, so the value is not propagated to 110 * higher layers. Virtual network devices transmit synchronously; in this case 111 * the driver transmit return codes are consumed by dev_queue_xmit(), and all 112 * others are propagated to higher layers. 113 */ 114 115 /* qdisc ->enqueue() return codes. */ 116 #define NET_XMIT_SUCCESS 0x00 117 #define NET_XMIT_DROP 0x01 /* skb dropped */ 118 #define NET_XMIT_CN 0x02 /* congestion notification */ 119 #define NET_XMIT_MASK 0x0f /* qdisc flags in net/sch_generic.h */ 120 121 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It 122 * indicates that the device will soon be dropping packets, or already drops 123 * some packets of the same priority; prompting us to send less aggressively. */ 124 #define net_xmit_eval(e) ((e) == NET_XMIT_CN ? 0 : (e)) 125 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0) 126 127 /* Driver transmit return codes */ 128 #define NETDEV_TX_MASK 0xf0 129 130 enum netdev_tx { 131 __NETDEV_TX_MIN = INT_MIN, /* make sure enum is signed */ 132 NETDEV_TX_OK = 0x00, /* driver took care of packet */ 133 NETDEV_TX_BUSY = 0x10, /* driver tx path was busy*/ 134 }; 135 typedef enum netdev_tx netdev_tx_t; 136 137 /* 138 * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant; 139 * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed. 140 */ 141 static inline bool dev_xmit_complete(int rc) 142 { 143 /* 144 * Positive cases with an skb consumed by a driver: 145 * - successful transmission (rc == NETDEV_TX_OK) 146 * - error while transmitting (rc < 0) 147 * - error while queueing to a different device (rc & NET_XMIT_MASK) 148 */ 149 if (likely(rc < NET_XMIT_MASK)) 150 return true; 151 152 return false; 153 } 154 155 /* 156 * Compute the worst-case header length according to the protocols 157 * used. 158 */ 159 160 #if defined(CONFIG_HYPERV_NET) 161 # define LL_MAX_HEADER 128 162 #elif defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25) 163 # if defined(CONFIG_MAC80211_MESH) 164 # define LL_MAX_HEADER 128 165 # else 166 # define LL_MAX_HEADER 96 167 # endif 168 #else 169 # define LL_MAX_HEADER 32 170 #endif 171 172 #if !IS_ENABLED(CONFIG_NET_IPIP) && !IS_ENABLED(CONFIG_NET_IPGRE) && \ 173 !IS_ENABLED(CONFIG_IPV6_SIT) && !IS_ENABLED(CONFIG_IPV6_TUNNEL) 174 #define MAX_HEADER LL_MAX_HEADER 175 #else 176 #define MAX_HEADER (LL_MAX_HEADER + 48) 177 #endif 178 179 /* 180 * Old network device statistics. Fields are native words 181 * (unsigned long) so they can be read and written atomically. 182 */ 183 184 #define NET_DEV_STAT(FIELD) \ 185 union { \ 186 unsigned long FIELD; \ 187 atomic_long_t __##FIELD; \ 188 } 189 190 struct net_device_stats { 191 NET_DEV_STAT(rx_packets); 192 NET_DEV_STAT(tx_packets); 193 NET_DEV_STAT(rx_bytes); 194 NET_DEV_STAT(tx_bytes); 195 NET_DEV_STAT(rx_errors); 196 NET_DEV_STAT(tx_errors); 197 NET_DEV_STAT(rx_dropped); 198 NET_DEV_STAT(tx_dropped); 199 NET_DEV_STAT(multicast); 200 NET_DEV_STAT(collisions); 201 NET_DEV_STAT(rx_length_errors); 202 NET_DEV_STAT(rx_over_errors); 203 NET_DEV_STAT(rx_crc_errors); 204 NET_DEV_STAT(rx_frame_errors); 205 NET_DEV_STAT(rx_fifo_errors); 206 NET_DEV_STAT(rx_missed_errors); 207 NET_DEV_STAT(tx_aborted_errors); 208 NET_DEV_STAT(tx_carrier_errors); 209 NET_DEV_STAT(tx_fifo_errors); 210 NET_DEV_STAT(tx_heartbeat_errors); 211 NET_DEV_STAT(tx_window_errors); 212 NET_DEV_STAT(rx_compressed); 213 NET_DEV_STAT(tx_compressed); 214 }; 215 #undef NET_DEV_STAT 216 217 /* per-cpu stats, allocated on demand. 218 * Try to fit them in a single cache line, for dev_get_stats() sake. 219 */ 220 struct net_device_core_stats { 221 unsigned long rx_dropped; 222 unsigned long tx_dropped; 223 unsigned long rx_nohandler; 224 unsigned long rx_otherhost_dropped; 225 } __aligned(4 * sizeof(unsigned long)); 226 227 #include <linux/cache.h> 228 #include <linux/skbuff.h> 229 230 #ifdef CONFIG_RPS 231 #include <linux/static_key.h> 232 extern struct static_key_false rps_needed; 233 extern struct static_key_false rfs_needed; 234 #endif 235 236 struct neighbour; 237 struct neigh_parms; 238 struct sk_buff; 239 240 struct netdev_hw_addr { 241 struct list_head list; 242 struct rb_node node; 243 unsigned char addr[MAX_ADDR_LEN]; 244 unsigned char type; 245 #define NETDEV_HW_ADDR_T_LAN 1 246 #define NETDEV_HW_ADDR_T_SAN 2 247 #define NETDEV_HW_ADDR_T_UNICAST 3 248 #define NETDEV_HW_ADDR_T_MULTICAST 4 249 bool global_use; 250 int sync_cnt; 251 int refcount; 252 int synced; 253 struct rcu_head rcu_head; 254 }; 255 256 struct netdev_hw_addr_list { 257 struct list_head list; 258 int count; 259 260 /* Auxiliary tree for faster lookup on addition and deletion */ 261 struct rb_root tree; 262 }; 263 264 #define netdev_hw_addr_list_count(l) ((l)->count) 265 #define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0) 266 #define netdev_hw_addr_list_for_each(ha, l) \ 267 list_for_each_entry(ha, &(l)->list, list) 268 269 #define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc) 270 #define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc) 271 #define netdev_for_each_uc_addr(ha, dev) \ 272 netdev_hw_addr_list_for_each(ha, &(dev)->uc) 273 #define netdev_for_each_synced_uc_addr(_ha, _dev) \ 274 netdev_for_each_uc_addr((_ha), (_dev)) \ 275 if ((_ha)->sync_cnt) 276 277 #define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc) 278 #define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc) 279 #define netdev_for_each_mc_addr(ha, dev) \ 280 netdev_hw_addr_list_for_each(ha, &(dev)->mc) 281 #define netdev_for_each_synced_mc_addr(_ha, _dev) \ 282 netdev_for_each_mc_addr((_ha), (_dev)) \ 283 if ((_ha)->sync_cnt) 284 285 struct hh_cache { 286 unsigned int hh_len; 287 seqlock_t hh_lock; 288 289 /* cached hardware header; allow for machine alignment needs. */ 290 #define HH_DATA_MOD 16 291 #define HH_DATA_OFF(__len) \ 292 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) 293 #define HH_DATA_ALIGN(__len) \ 294 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) 295 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; 296 }; 297 298 /* Reserve HH_DATA_MOD byte-aligned hard_header_len, but at least that much. 299 * Alternative is: 300 * dev->hard_header_len ? (dev->hard_header_len + 301 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 302 * 303 * We could use other alignment values, but we must maintain the 304 * relationship HH alignment <= LL alignment. 305 */ 306 #define LL_RESERVED_SPACE(dev) \ 307 ((((dev)->hard_header_len + READ_ONCE((dev)->needed_headroom)) \ 308 & ~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 309 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 310 ((((dev)->hard_header_len + READ_ONCE((dev)->needed_headroom) + (extra)) \ 311 & ~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 312 313 struct header_ops { 314 int (*create) (struct sk_buff *skb, struct net_device *dev, 315 unsigned short type, const void *daddr, 316 const void *saddr, unsigned int len); 317 int (*parse)(const struct sk_buff *skb, unsigned char *haddr); 318 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh, __be16 type); 319 void (*cache_update)(struct hh_cache *hh, 320 const struct net_device *dev, 321 const unsigned char *haddr); 322 bool (*validate)(const char *ll_header, unsigned int len); 323 __be16 (*parse_protocol)(const struct sk_buff *skb); 324 }; 325 326 /* These flag bits are private to the generic network queueing 327 * layer; they may not be explicitly referenced by any other 328 * code. 329 */ 330 331 enum netdev_state_t { 332 __LINK_STATE_START, 333 __LINK_STATE_PRESENT, 334 __LINK_STATE_NOCARRIER, 335 __LINK_STATE_LINKWATCH_PENDING, 336 __LINK_STATE_DORMANT, 337 __LINK_STATE_TESTING, 338 }; 339 340 struct gro_list { 341 struct list_head list; 342 int count; 343 }; 344 345 /* 346 * size of gro hash buckets, must less than bit number of 347 * napi_struct::gro_bitmask 348 */ 349 #define GRO_HASH_BUCKETS 8 350 351 /* 352 * Structure for NAPI scheduling similar to tasklet but with weighting 353 */ 354 struct napi_struct { 355 /* The poll_list must only be managed by the entity which 356 * changes the state of the NAPI_STATE_SCHED bit. This means 357 * whoever atomically sets that bit can add this napi_struct 358 * to the per-CPU poll_list, and whoever clears that bit 359 * can remove from the list right before clearing the bit. 360 */ 361 struct list_head poll_list; 362 363 unsigned long state; 364 int weight; 365 int defer_hard_irqs_count; 366 unsigned long gro_bitmask; 367 int (*poll)(struct napi_struct *, int); 368 #ifdef CONFIG_NETPOLL 369 /* CPU actively polling if netpoll is configured */ 370 int poll_owner; 371 #endif 372 /* CPU on which NAPI has been scheduled for processing */ 373 int list_owner; 374 struct net_device *dev; 375 struct gro_list gro_hash[GRO_HASH_BUCKETS]; 376 struct sk_buff *skb; 377 struct list_head rx_list; /* Pending GRO_NORMAL skbs */ 378 int rx_count; /* length of rx_list */ 379 unsigned int napi_id; 380 struct hrtimer timer; 381 struct task_struct *thread; 382 /* control-path-only fields follow */ 383 struct list_head dev_list; 384 struct hlist_node napi_hash_node; 385 }; 386 387 enum { 388 NAPI_STATE_SCHED, /* Poll is scheduled */ 389 NAPI_STATE_MISSED, /* reschedule a napi */ 390 NAPI_STATE_DISABLE, /* Disable pending */ 391 NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */ 392 NAPI_STATE_LISTED, /* NAPI added to system lists */ 393 NAPI_STATE_NO_BUSY_POLL, /* Do not add in napi_hash, no busy polling */ 394 NAPI_STATE_IN_BUSY_POLL, /* sk_busy_loop() owns this NAPI */ 395 NAPI_STATE_PREFER_BUSY_POLL, /* prefer busy-polling over softirq processing*/ 396 NAPI_STATE_THREADED, /* The poll is performed inside its own thread*/ 397 NAPI_STATE_SCHED_THREADED, /* Napi is currently scheduled in threaded mode */ 398 }; 399 400 enum { 401 NAPIF_STATE_SCHED = BIT(NAPI_STATE_SCHED), 402 NAPIF_STATE_MISSED = BIT(NAPI_STATE_MISSED), 403 NAPIF_STATE_DISABLE = BIT(NAPI_STATE_DISABLE), 404 NAPIF_STATE_NPSVC = BIT(NAPI_STATE_NPSVC), 405 NAPIF_STATE_LISTED = BIT(NAPI_STATE_LISTED), 406 NAPIF_STATE_NO_BUSY_POLL = BIT(NAPI_STATE_NO_BUSY_POLL), 407 NAPIF_STATE_IN_BUSY_POLL = BIT(NAPI_STATE_IN_BUSY_POLL), 408 NAPIF_STATE_PREFER_BUSY_POLL = BIT(NAPI_STATE_PREFER_BUSY_POLL), 409 NAPIF_STATE_THREADED = BIT(NAPI_STATE_THREADED), 410 NAPIF_STATE_SCHED_THREADED = BIT(NAPI_STATE_SCHED_THREADED), 411 }; 412 413 enum gro_result { 414 GRO_MERGED, 415 GRO_MERGED_FREE, 416 GRO_HELD, 417 GRO_NORMAL, 418 GRO_CONSUMED, 419 }; 420 typedef enum gro_result gro_result_t; 421 422 /* 423 * enum rx_handler_result - Possible return values for rx_handlers. 424 * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it 425 * further. 426 * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in 427 * case skb->dev was changed by rx_handler. 428 * @RX_HANDLER_EXACT: Force exact delivery, no wildcard. 429 * @RX_HANDLER_PASS: Do nothing, pass the skb as if no rx_handler was called. 430 * 431 * rx_handlers are functions called from inside __netif_receive_skb(), to do 432 * special processing of the skb, prior to delivery to protocol handlers. 433 * 434 * Currently, a net_device can only have a single rx_handler registered. Trying 435 * to register a second rx_handler will return -EBUSY. 436 * 437 * To register a rx_handler on a net_device, use netdev_rx_handler_register(). 438 * To unregister a rx_handler on a net_device, use 439 * netdev_rx_handler_unregister(). 440 * 441 * Upon return, rx_handler is expected to tell __netif_receive_skb() what to 442 * do with the skb. 443 * 444 * If the rx_handler consumed the skb in some way, it should return 445 * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for 446 * the skb to be delivered in some other way. 447 * 448 * If the rx_handler changed skb->dev, to divert the skb to another 449 * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the 450 * new device will be called if it exists. 451 * 452 * If the rx_handler decides the skb should be ignored, it should return 453 * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that 454 * are registered on exact device (ptype->dev == skb->dev). 455 * 456 * If the rx_handler didn't change skb->dev, but wants the skb to be normally 457 * delivered, it should return RX_HANDLER_PASS. 458 * 459 * A device without a registered rx_handler will behave as if rx_handler 460 * returned RX_HANDLER_PASS. 461 */ 462 463 enum rx_handler_result { 464 RX_HANDLER_CONSUMED, 465 RX_HANDLER_ANOTHER, 466 RX_HANDLER_EXACT, 467 RX_HANDLER_PASS, 468 }; 469 typedef enum rx_handler_result rx_handler_result_t; 470 typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb); 471 472 void __napi_schedule(struct napi_struct *n); 473 void __napi_schedule_irqoff(struct napi_struct *n); 474 475 static inline bool napi_disable_pending(struct napi_struct *n) 476 { 477 return test_bit(NAPI_STATE_DISABLE, &n->state); 478 } 479 480 static inline bool napi_prefer_busy_poll(struct napi_struct *n) 481 { 482 return test_bit(NAPI_STATE_PREFER_BUSY_POLL, &n->state); 483 } 484 485 /** 486 * napi_is_scheduled - test if NAPI is scheduled 487 * @n: NAPI context 488 * 489 * This check is "best-effort". With no locking implemented, 490 * a NAPI can be scheduled or terminate right after this check 491 * and produce not precise results. 492 * 493 * NAPI_STATE_SCHED is an internal state, napi_is_scheduled 494 * should not be used normally and napi_schedule should be 495 * used instead. 496 * 497 * Use only if the driver really needs to check if a NAPI 498 * is scheduled for example in the context of delayed timer 499 * that can be skipped if a NAPI is already scheduled. 500 * 501 * Return True if NAPI is scheduled, False otherwise. 502 */ 503 static inline bool napi_is_scheduled(struct napi_struct *n) 504 { 505 return test_bit(NAPI_STATE_SCHED, &n->state); 506 } 507 508 bool napi_schedule_prep(struct napi_struct *n); 509 510 /** 511 * napi_schedule - schedule NAPI poll 512 * @n: NAPI context 513 * 514 * Schedule NAPI poll routine to be called if it is not already 515 * running. 516 * Return true if we schedule a NAPI or false if not. 517 * Refer to napi_schedule_prep() for additional reason on why 518 * a NAPI might not be scheduled. 519 */ 520 static inline bool napi_schedule(struct napi_struct *n) 521 { 522 if (napi_schedule_prep(n)) { 523 __napi_schedule(n); 524 return true; 525 } 526 527 return false; 528 } 529 530 /** 531 * napi_schedule_irqoff - schedule NAPI poll 532 * @n: NAPI context 533 * 534 * Variant of napi_schedule(), assuming hard irqs are masked. 535 */ 536 static inline void napi_schedule_irqoff(struct napi_struct *n) 537 { 538 if (napi_schedule_prep(n)) 539 __napi_schedule_irqoff(n); 540 } 541 542 /** 543 * napi_complete_done - NAPI processing complete 544 * @n: NAPI context 545 * @work_done: number of packets processed 546 * 547 * Mark NAPI processing as complete. Should only be called if poll budget 548 * has not been completely consumed. 549 * Prefer over napi_complete(). 550 * Return false if device should avoid rearming interrupts. 551 */ 552 bool napi_complete_done(struct napi_struct *n, int work_done); 553 554 static inline bool napi_complete(struct napi_struct *n) 555 { 556 return napi_complete_done(n, 0); 557 } 558 559 int dev_set_threaded(struct net_device *dev, bool threaded); 560 561 /** 562 * napi_disable - prevent NAPI from scheduling 563 * @n: NAPI context 564 * 565 * Stop NAPI from being scheduled on this context. 566 * Waits till any outstanding processing completes. 567 */ 568 void napi_disable(struct napi_struct *n); 569 570 void napi_enable(struct napi_struct *n); 571 572 /** 573 * napi_synchronize - wait until NAPI is not running 574 * @n: NAPI context 575 * 576 * Wait until NAPI is done being scheduled on this context. 577 * Waits till any outstanding processing completes but 578 * does not disable future activations. 579 */ 580 static inline void napi_synchronize(const struct napi_struct *n) 581 { 582 if (IS_ENABLED(CONFIG_SMP)) 583 while (test_bit(NAPI_STATE_SCHED, &n->state)) 584 msleep(1); 585 else 586 barrier(); 587 } 588 589 /** 590 * napi_if_scheduled_mark_missed - if napi is running, set the 591 * NAPIF_STATE_MISSED 592 * @n: NAPI context 593 * 594 * If napi is running, set the NAPIF_STATE_MISSED, and return true if 595 * NAPI is scheduled. 596 **/ 597 static inline bool napi_if_scheduled_mark_missed(struct napi_struct *n) 598 { 599 unsigned long val, new; 600 601 val = READ_ONCE(n->state); 602 do { 603 if (val & NAPIF_STATE_DISABLE) 604 return true; 605 606 if (!(val & NAPIF_STATE_SCHED)) 607 return false; 608 609 new = val | NAPIF_STATE_MISSED; 610 } while (!try_cmpxchg(&n->state, &val, new)); 611 612 return true; 613 } 614 615 enum netdev_queue_state_t { 616 __QUEUE_STATE_DRV_XOFF, 617 __QUEUE_STATE_STACK_XOFF, 618 __QUEUE_STATE_FROZEN, 619 }; 620 621 #define QUEUE_STATE_DRV_XOFF (1 << __QUEUE_STATE_DRV_XOFF) 622 #define QUEUE_STATE_STACK_XOFF (1 << __QUEUE_STATE_STACK_XOFF) 623 #define QUEUE_STATE_FROZEN (1 << __QUEUE_STATE_FROZEN) 624 625 #define QUEUE_STATE_ANY_XOFF (QUEUE_STATE_DRV_XOFF | QUEUE_STATE_STACK_XOFF) 626 #define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF | \ 627 QUEUE_STATE_FROZEN) 628 #define QUEUE_STATE_DRV_XOFF_OR_FROZEN (QUEUE_STATE_DRV_XOFF | \ 629 QUEUE_STATE_FROZEN) 630 631 /* 632 * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue. The 633 * netif_tx_* functions below are used to manipulate this flag. The 634 * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit 635 * queue independently. The netif_xmit_*stopped functions below are called 636 * to check if the queue has been stopped by the driver or stack (either 637 * of the XOFF bits are set in the state). Drivers should not need to call 638 * netif_xmit*stopped functions, they should only be using netif_tx_*. 639 */ 640 641 struct netdev_queue { 642 /* 643 * read-mostly part 644 */ 645 struct net_device *dev; 646 netdevice_tracker dev_tracker; 647 648 struct Qdisc __rcu *qdisc; 649 struct Qdisc __rcu *qdisc_sleeping; 650 #ifdef CONFIG_SYSFS 651 struct kobject kobj; 652 #endif 653 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA) 654 int numa_node; 655 #endif 656 unsigned long tx_maxrate; 657 /* 658 * Number of TX timeouts for this queue 659 * (/sys/class/net/DEV/Q/trans_timeout) 660 */ 661 atomic_long_t trans_timeout; 662 663 /* Subordinate device that the queue has been assigned to */ 664 struct net_device *sb_dev; 665 #ifdef CONFIG_XDP_SOCKETS 666 struct xsk_buff_pool *pool; 667 #endif 668 /* 669 * write-mostly part 670 */ 671 spinlock_t _xmit_lock ____cacheline_aligned_in_smp; 672 int xmit_lock_owner; 673 /* 674 * Time (in jiffies) of last Tx 675 */ 676 unsigned long trans_start; 677 678 unsigned long state; 679 680 #ifdef CONFIG_BQL 681 struct dql dql; 682 #endif 683 } ____cacheline_aligned_in_smp; 684 685 extern int sysctl_fb_tunnels_only_for_init_net; 686 extern int sysctl_devconf_inherit_init_net; 687 688 /* 689 * sysctl_fb_tunnels_only_for_init_net == 0 : For all netns 690 * == 1 : For initns only 691 * == 2 : For none. 692 */ 693 static inline bool net_has_fallback_tunnels(const struct net *net) 694 { 695 #if IS_ENABLED(CONFIG_SYSCTL) 696 int fb_tunnels_only_for_init_net = READ_ONCE(sysctl_fb_tunnels_only_for_init_net); 697 698 return !fb_tunnels_only_for_init_net || 699 (net_eq(net, &init_net) && fb_tunnels_only_for_init_net == 1); 700 #else 701 return true; 702 #endif 703 } 704 705 static inline int net_inherit_devconf(void) 706 { 707 #if IS_ENABLED(CONFIG_SYSCTL) 708 return READ_ONCE(sysctl_devconf_inherit_init_net); 709 #else 710 return 0; 711 #endif 712 } 713 714 static inline int netdev_queue_numa_node_read(const struct netdev_queue *q) 715 { 716 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA) 717 return q->numa_node; 718 #else 719 return NUMA_NO_NODE; 720 #endif 721 } 722 723 static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node) 724 { 725 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA) 726 q->numa_node = node; 727 #endif 728 } 729 730 #ifdef CONFIG_RPS 731 /* 732 * This structure holds an RPS map which can be of variable length. The 733 * map is an array of CPUs. 734 */ 735 struct rps_map { 736 unsigned int len; 737 struct rcu_head rcu; 738 u16 cpus[]; 739 }; 740 #define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16))) 741 742 /* 743 * The rps_dev_flow structure contains the mapping of a flow to a CPU, the 744 * tail pointer for that CPU's input queue at the time of last enqueue, and 745 * a hardware filter index. 746 */ 747 struct rps_dev_flow { 748 u16 cpu; 749 u16 filter; 750 unsigned int last_qtail; 751 }; 752 #define RPS_NO_FILTER 0xffff 753 754 /* 755 * The rps_dev_flow_table structure contains a table of flow mappings. 756 */ 757 struct rps_dev_flow_table { 758 unsigned int mask; 759 struct rcu_head rcu; 760 struct rps_dev_flow flows[]; 761 }; 762 #define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \ 763 ((_num) * sizeof(struct rps_dev_flow))) 764 765 /* 766 * The rps_sock_flow_table contains mappings of flows to the last CPU 767 * on which they were processed by the application (set in recvmsg). 768 * Each entry is a 32bit value. Upper part is the high-order bits 769 * of flow hash, lower part is CPU number. 770 * rps_cpu_mask is used to partition the space, depending on number of 771 * possible CPUs : rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1 772 * For example, if 64 CPUs are possible, rps_cpu_mask = 0x3f, 773 * meaning we use 32-6=26 bits for the hash. 774 */ 775 struct rps_sock_flow_table { 776 u32 mask; 777 778 u32 ents[] ____cacheline_aligned_in_smp; 779 }; 780 #define RPS_SOCK_FLOW_TABLE_SIZE(_num) (offsetof(struct rps_sock_flow_table, ents[_num])) 781 782 #define RPS_NO_CPU 0xffff 783 784 extern u32 rps_cpu_mask; 785 extern struct rps_sock_flow_table __rcu *rps_sock_flow_table; 786 787 static inline void rps_record_sock_flow(struct rps_sock_flow_table *table, 788 u32 hash) 789 { 790 if (table && hash) { 791 unsigned int index = hash & table->mask; 792 u32 val = hash & ~rps_cpu_mask; 793 794 /* We only give a hint, preemption can change CPU under us */ 795 val |= raw_smp_processor_id(); 796 797 /* The following WRITE_ONCE() is paired with the READ_ONCE() 798 * here, and another one in get_rps_cpu(). 799 */ 800 if (READ_ONCE(table->ents[index]) != val) 801 WRITE_ONCE(table->ents[index], val); 802 } 803 } 804 805 #ifdef CONFIG_RFS_ACCEL 806 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id, 807 u16 filter_id); 808 #endif 809 #endif /* CONFIG_RPS */ 810 811 /* XPS map type and offset of the xps map within net_device->xps_maps[]. */ 812 enum xps_map_type { 813 XPS_CPUS = 0, 814 XPS_RXQS, 815 XPS_MAPS_MAX, 816 }; 817 818 #ifdef CONFIG_XPS 819 /* 820 * This structure holds an XPS map which can be of variable length. The 821 * map is an array of queues. 822 */ 823 struct xps_map { 824 unsigned int len; 825 unsigned int alloc_len; 826 struct rcu_head rcu; 827 u16 queues[]; 828 }; 829 #define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16))) 830 #define XPS_MIN_MAP_ALLOC ((L1_CACHE_ALIGN(offsetof(struct xps_map, queues[1])) \ 831 - sizeof(struct xps_map)) / sizeof(u16)) 832 833 /* 834 * This structure holds all XPS maps for device. Maps are indexed by CPU. 835 * 836 * We keep track of the number of cpus/rxqs used when the struct is allocated, 837 * in nr_ids. This will help not accessing out-of-bound memory. 838 * 839 * We keep track of the number of traffic classes used when the struct is 840 * allocated, in num_tc. This will be used to navigate the maps, to ensure we're 841 * not crossing its upper bound, as the original dev->num_tc can be updated in 842 * the meantime. 843 */ 844 struct xps_dev_maps { 845 struct rcu_head rcu; 846 unsigned int nr_ids; 847 s16 num_tc; 848 struct xps_map __rcu *attr_map[]; /* Either CPUs map or RXQs map */ 849 }; 850 851 #define XPS_CPU_DEV_MAPS_SIZE(_tcs) (sizeof(struct xps_dev_maps) + \ 852 (nr_cpu_ids * (_tcs) * sizeof(struct xps_map *))) 853 854 #define XPS_RXQ_DEV_MAPS_SIZE(_tcs, _rxqs) (sizeof(struct xps_dev_maps) +\ 855 (_rxqs * (_tcs) * sizeof(struct xps_map *))) 856 857 #endif /* CONFIG_XPS */ 858 859 #define TC_MAX_QUEUE 16 860 #define TC_BITMASK 15 861 /* HW offloaded queuing disciplines txq count and offset maps */ 862 struct netdev_tc_txq { 863 u16 count; 864 u16 offset; 865 }; 866 867 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 868 /* 869 * This structure is to hold information about the device 870 * configured to run FCoE protocol stack. 871 */ 872 struct netdev_fcoe_hbainfo { 873 char manufacturer[64]; 874 char serial_number[64]; 875 char hardware_version[64]; 876 char driver_version[64]; 877 char optionrom_version[64]; 878 char firmware_version[64]; 879 char model[256]; 880 char model_description[256]; 881 }; 882 #endif 883 884 #define MAX_PHYS_ITEM_ID_LEN 32 885 886 /* This structure holds a unique identifier to identify some 887 * physical item (port for example) used by a netdevice. 888 */ 889 struct netdev_phys_item_id { 890 unsigned char id[MAX_PHYS_ITEM_ID_LEN]; 891 unsigned char id_len; 892 }; 893 894 static inline bool netdev_phys_item_id_same(struct netdev_phys_item_id *a, 895 struct netdev_phys_item_id *b) 896 { 897 return a->id_len == b->id_len && 898 memcmp(a->id, b->id, a->id_len) == 0; 899 } 900 901 typedef u16 (*select_queue_fallback_t)(struct net_device *dev, 902 struct sk_buff *skb, 903 struct net_device *sb_dev); 904 905 enum net_device_path_type { 906 DEV_PATH_ETHERNET = 0, 907 DEV_PATH_VLAN, 908 DEV_PATH_BRIDGE, 909 DEV_PATH_PPPOE, 910 DEV_PATH_DSA, 911 DEV_PATH_MTK_WDMA, 912 }; 913 914 struct net_device_path { 915 enum net_device_path_type type; 916 const struct net_device *dev; 917 union { 918 struct { 919 u16 id; 920 __be16 proto; 921 u8 h_dest[ETH_ALEN]; 922 } encap; 923 struct { 924 enum { 925 DEV_PATH_BR_VLAN_KEEP, 926 DEV_PATH_BR_VLAN_TAG, 927 DEV_PATH_BR_VLAN_UNTAG, 928 DEV_PATH_BR_VLAN_UNTAG_HW, 929 } vlan_mode; 930 u16 vlan_id; 931 __be16 vlan_proto; 932 } bridge; 933 struct { 934 int port; 935 u16 proto; 936 } dsa; 937 struct { 938 u8 wdma_idx; 939 u8 queue; 940 u16 wcid; 941 u8 bss; 942 u8 amsdu; 943 } mtk_wdma; 944 }; 945 }; 946 947 #define NET_DEVICE_PATH_STACK_MAX 5 948 #define NET_DEVICE_PATH_VLAN_MAX 2 949 950 struct net_device_path_stack { 951 int num_paths; 952 struct net_device_path path[NET_DEVICE_PATH_STACK_MAX]; 953 }; 954 955 struct net_device_path_ctx { 956 const struct net_device *dev; 957 u8 daddr[ETH_ALEN]; 958 959 int num_vlans; 960 struct { 961 u16 id; 962 __be16 proto; 963 } vlan[NET_DEVICE_PATH_VLAN_MAX]; 964 }; 965 966 enum tc_setup_type { 967 TC_QUERY_CAPS, 968 TC_SETUP_QDISC_MQPRIO, 969 TC_SETUP_CLSU32, 970 TC_SETUP_CLSFLOWER, 971 TC_SETUP_CLSMATCHALL, 972 TC_SETUP_CLSBPF, 973 TC_SETUP_BLOCK, 974 TC_SETUP_QDISC_CBS, 975 TC_SETUP_QDISC_RED, 976 TC_SETUP_QDISC_PRIO, 977 TC_SETUP_QDISC_MQ, 978 TC_SETUP_QDISC_ETF, 979 TC_SETUP_ROOT_QDISC, 980 TC_SETUP_QDISC_GRED, 981 TC_SETUP_QDISC_TAPRIO, 982 TC_SETUP_FT, 983 TC_SETUP_QDISC_ETS, 984 TC_SETUP_QDISC_TBF, 985 TC_SETUP_QDISC_FIFO, 986 TC_SETUP_QDISC_HTB, 987 TC_SETUP_ACT, 988 }; 989 990 /* These structures hold the attributes of bpf state that are being passed 991 * to the netdevice through the bpf op. 992 */ 993 enum bpf_netdev_command { 994 /* Set or clear a bpf program used in the earliest stages of packet 995 * rx. The prog will have been loaded as BPF_PROG_TYPE_XDP. The callee 996 * is responsible for calling bpf_prog_put on any old progs that are 997 * stored. In case of error, the callee need not release the new prog 998 * reference, but on success it takes ownership and must bpf_prog_put 999 * when it is no longer used. 1000 */ 1001 XDP_SETUP_PROG, 1002 XDP_SETUP_PROG_HW, 1003 /* BPF program for offload callbacks, invoked at program load time. */ 1004 BPF_OFFLOAD_MAP_ALLOC, 1005 BPF_OFFLOAD_MAP_FREE, 1006 XDP_SETUP_XSK_POOL, 1007 }; 1008 1009 struct bpf_prog_offload_ops; 1010 struct netlink_ext_ack; 1011 struct xdp_umem; 1012 struct xdp_dev_bulk_queue; 1013 struct bpf_xdp_link; 1014 1015 enum bpf_xdp_mode { 1016 XDP_MODE_SKB = 0, 1017 XDP_MODE_DRV = 1, 1018 XDP_MODE_HW = 2, 1019 __MAX_XDP_MODE 1020 }; 1021 1022 struct bpf_xdp_entity { 1023 struct bpf_prog *prog; 1024 struct bpf_xdp_link *link; 1025 }; 1026 1027 struct netdev_bpf { 1028 enum bpf_netdev_command command; 1029 union { 1030 /* XDP_SETUP_PROG */ 1031 struct { 1032 u32 flags; 1033 struct bpf_prog *prog; 1034 struct netlink_ext_ack *extack; 1035 }; 1036 /* BPF_OFFLOAD_MAP_ALLOC, BPF_OFFLOAD_MAP_FREE */ 1037 struct { 1038 struct bpf_offloaded_map *offmap; 1039 }; 1040 /* XDP_SETUP_XSK_POOL */ 1041 struct { 1042 struct xsk_buff_pool *pool; 1043 u16 queue_id; 1044 } xsk; 1045 }; 1046 }; 1047 1048 /* Flags for ndo_xsk_wakeup. */ 1049 #define XDP_WAKEUP_RX (1 << 0) 1050 #define XDP_WAKEUP_TX (1 << 1) 1051 1052 #ifdef CONFIG_XFRM_OFFLOAD 1053 struct xfrmdev_ops { 1054 int (*xdo_dev_state_add) (struct xfrm_state *x, struct netlink_ext_ack *extack); 1055 void (*xdo_dev_state_delete) (struct xfrm_state *x); 1056 void (*xdo_dev_state_free) (struct xfrm_state *x); 1057 bool (*xdo_dev_offload_ok) (struct sk_buff *skb, 1058 struct xfrm_state *x); 1059 void (*xdo_dev_state_advance_esn) (struct xfrm_state *x); 1060 void (*xdo_dev_state_update_curlft) (struct xfrm_state *x); 1061 int (*xdo_dev_policy_add) (struct xfrm_policy *x, struct netlink_ext_ack *extack); 1062 void (*xdo_dev_policy_delete) (struct xfrm_policy *x); 1063 void (*xdo_dev_policy_free) (struct xfrm_policy *x); 1064 }; 1065 #endif 1066 1067 struct dev_ifalias { 1068 struct rcu_head rcuhead; 1069 char ifalias[]; 1070 }; 1071 1072 struct devlink; 1073 struct tlsdev_ops; 1074 1075 struct netdev_net_notifier { 1076 struct list_head list; 1077 struct notifier_block *nb; 1078 }; 1079 1080 /* 1081 * This structure defines the management hooks for network devices. 1082 * The following hooks can be defined; unless noted otherwise, they are 1083 * optional and can be filled with a null pointer. 1084 * 1085 * int (*ndo_init)(struct net_device *dev); 1086 * This function is called once when a network device is registered. 1087 * The network device can use this for any late stage initialization 1088 * or semantic validation. It can fail with an error code which will 1089 * be propagated back to register_netdev. 1090 * 1091 * void (*ndo_uninit)(struct net_device *dev); 1092 * This function is called when device is unregistered or when registration 1093 * fails. It is not called if init fails. 1094 * 1095 * int (*ndo_open)(struct net_device *dev); 1096 * This function is called when a network device transitions to the up 1097 * state. 1098 * 1099 * int (*ndo_stop)(struct net_device *dev); 1100 * This function is called when a network device transitions to the down 1101 * state. 1102 * 1103 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb, 1104 * struct net_device *dev); 1105 * Called when a packet needs to be transmitted. 1106 * Returns NETDEV_TX_OK. Can return NETDEV_TX_BUSY, but you should stop 1107 * the queue before that can happen; it's for obsolete devices and weird 1108 * corner cases, but the stack really does a non-trivial amount 1109 * of useless work if you return NETDEV_TX_BUSY. 1110 * Required; cannot be NULL. 1111 * 1112 * netdev_features_t (*ndo_features_check)(struct sk_buff *skb, 1113 * struct net_device *dev 1114 * netdev_features_t features); 1115 * Called by core transmit path to determine if device is capable of 1116 * performing offload operations on a given packet. This is to give 1117 * the device an opportunity to implement any restrictions that cannot 1118 * be otherwise expressed by feature flags. The check is called with 1119 * the set of features that the stack has calculated and it returns 1120 * those the driver believes to be appropriate. 1121 * 1122 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb, 1123 * struct net_device *sb_dev); 1124 * Called to decide which queue to use when device supports multiple 1125 * transmit queues. 1126 * 1127 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags); 1128 * This function is called to allow device receiver to make 1129 * changes to configuration when multicast or promiscuous is enabled. 1130 * 1131 * void (*ndo_set_rx_mode)(struct net_device *dev); 1132 * This function is called device changes address list filtering. 1133 * If driver handles unicast address filtering, it should set 1134 * IFF_UNICAST_FLT in its priv_flags. 1135 * 1136 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr); 1137 * This function is called when the Media Access Control address 1138 * needs to be changed. If this interface is not defined, the 1139 * MAC address can not be changed. 1140 * 1141 * int (*ndo_validate_addr)(struct net_device *dev); 1142 * Test if Media Access Control address is valid for the device. 1143 * 1144 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd); 1145 * Old-style ioctl entry point. This is used internally by the 1146 * appletalk and ieee802154 subsystems but is no longer called by 1147 * the device ioctl handler. 1148 * 1149 * int (*ndo_siocbond)(struct net_device *dev, struct ifreq *ifr, int cmd); 1150 * Used by the bonding driver for its device specific ioctls: 1151 * SIOCBONDENSLAVE, SIOCBONDRELEASE, SIOCBONDSETHWADDR, SIOCBONDCHANGEACTIVE, 1152 * SIOCBONDSLAVEINFOQUERY, and SIOCBONDINFOQUERY 1153 * 1154 * * int (*ndo_eth_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd); 1155 * Called for ethernet specific ioctls: SIOCGMIIPHY, SIOCGMIIREG, 1156 * SIOCSMIIREG, SIOCSHWTSTAMP and SIOCGHWTSTAMP. 1157 * 1158 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map); 1159 * Used to set network devices bus interface parameters. This interface 1160 * is retained for legacy reasons; new devices should use the bus 1161 * interface (PCI) for low level management. 1162 * 1163 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu); 1164 * Called when a user wants to change the Maximum Transfer Unit 1165 * of a device. 1166 * 1167 * void (*ndo_tx_timeout)(struct net_device *dev, unsigned int txqueue); 1168 * Callback used when the transmitter has not made any progress 1169 * for dev->watchdog ticks. 1170 * 1171 * void (*ndo_get_stats64)(struct net_device *dev, 1172 * struct rtnl_link_stats64 *storage); 1173 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev); 1174 * Called when a user wants to get the network device usage 1175 * statistics. Drivers must do one of the following: 1176 * 1. Define @ndo_get_stats64 to fill in a zero-initialised 1177 * rtnl_link_stats64 structure passed by the caller. 1178 * 2. Define @ndo_get_stats to update a net_device_stats structure 1179 * (which should normally be dev->stats) and return a pointer to 1180 * it. The structure may be changed asynchronously only if each 1181 * field is written atomically. 1182 * 3. Update dev->stats asynchronously and atomically, and define 1183 * neither operation. 1184 * 1185 * bool (*ndo_has_offload_stats)(const struct net_device *dev, int attr_id) 1186 * Return true if this device supports offload stats of this attr_id. 1187 * 1188 * int (*ndo_get_offload_stats)(int attr_id, const struct net_device *dev, 1189 * void *attr_data) 1190 * Get statistics for offload operations by attr_id. Write it into the 1191 * attr_data pointer. 1192 * 1193 * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, __be16 proto, u16 vid); 1194 * If device supports VLAN filtering this function is called when a 1195 * VLAN id is registered. 1196 * 1197 * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, __be16 proto, u16 vid); 1198 * If device supports VLAN filtering this function is called when a 1199 * VLAN id is unregistered. 1200 * 1201 * void (*ndo_poll_controller)(struct net_device *dev); 1202 * 1203 * SR-IOV management functions. 1204 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac); 1205 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, 1206 * u8 qos, __be16 proto); 1207 * int (*ndo_set_vf_rate)(struct net_device *dev, int vf, int min_tx_rate, 1208 * int max_tx_rate); 1209 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting); 1210 * int (*ndo_set_vf_trust)(struct net_device *dev, int vf, bool setting); 1211 * int (*ndo_get_vf_config)(struct net_device *dev, 1212 * int vf, struct ifla_vf_info *ivf); 1213 * int (*ndo_set_vf_link_state)(struct net_device *dev, int vf, int link_state); 1214 * int (*ndo_set_vf_port)(struct net_device *dev, int vf, 1215 * struct nlattr *port[]); 1216 * 1217 * Enable or disable the VF ability to query its RSS Redirection Table and 1218 * Hash Key. This is needed since on some devices VF share this information 1219 * with PF and querying it may introduce a theoretical security risk. 1220 * int (*ndo_set_vf_rss_query_en)(struct net_device *dev, int vf, bool setting); 1221 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb); 1222 * int (*ndo_setup_tc)(struct net_device *dev, enum tc_setup_type type, 1223 * void *type_data); 1224 * Called to setup any 'tc' scheduler, classifier or action on @dev. 1225 * This is always called from the stack with the rtnl lock held and netif 1226 * tx queues stopped. This allows the netdevice to perform queue 1227 * management safely. 1228 * 1229 * Fiber Channel over Ethernet (FCoE) offload functions. 1230 * int (*ndo_fcoe_enable)(struct net_device *dev); 1231 * Called when the FCoE protocol stack wants to start using LLD for FCoE 1232 * so the underlying device can perform whatever needed configuration or 1233 * initialization to support acceleration of FCoE traffic. 1234 * 1235 * int (*ndo_fcoe_disable)(struct net_device *dev); 1236 * Called when the FCoE protocol stack wants to stop using LLD for FCoE 1237 * so the underlying device can perform whatever needed clean-ups to 1238 * stop supporting acceleration of FCoE traffic. 1239 * 1240 * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid, 1241 * struct scatterlist *sgl, unsigned int sgc); 1242 * Called when the FCoE Initiator wants to initialize an I/O that 1243 * is a possible candidate for Direct Data Placement (DDP). The LLD can 1244 * perform necessary setup and returns 1 to indicate the device is set up 1245 * successfully to perform DDP on this I/O, otherwise this returns 0. 1246 * 1247 * int (*ndo_fcoe_ddp_done)(struct net_device *dev, u16 xid); 1248 * Called when the FCoE Initiator/Target is done with the DDPed I/O as 1249 * indicated by the FC exchange id 'xid', so the underlying device can 1250 * clean up and reuse resources for later DDP requests. 1251 * 1252 * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid, 1253 * struct scatterlist *sgl, unsigned int sgc); 1254 * Called when the FCoE Target wants to initialize an I/O that 1255 * is a possible candidate for Direct Data Placement (DDP). The LLD can 1256 * perform necessary setup and returns 1 to indicate the device is set up 1257 * successfully to perform DDP on this I/O, otherwise this returns 0. 1258 * 1259 * int (*ndo_fcoe_get_hbainfo)(struct net_device *dev, 1260 * struct netdev_fcoe_hbainfo *hbainfo); 1261 * Called when the FCoE Protocol stack wants information on the underlying 1262 * device. This information is utilized by the FCoE protocol stack to 1263 * register attributes with Fiber Channel management service as per the 1264 * FC-GS Fabric Device Management Information(FDMI) specification. 1265 * 1266 * int (*ndo_fcoe_get_wwn)(struct net_device *dev, u64 *wwn, int type); 1267 * Called when the underlying device wants to override default World Wide 1268 * Name (WWN) generation mechanism in FCoE protocol stack to pass its own 1269 * World Wide Port Name (WWPN) or World Wide Node Name (WWNN) to the FCoE 1270 * protocol stack to use. 1271 * 1272 * RFS acceleration. 1273 * int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb, 1274 * u16 rxq_index, u32 flow_id); 1275 * Set hardware filter for RFS. rxq_index is the target queue index; 1276 * flow_id is a flow ID to be passed to rps_may_expire_flow() later. 1277 * Return the filter ID on success, or a negative error code. 1278 * 1279 * Slave management functions (for bridge, bonding, etc). 1280 * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev); 1281 * Called to make another netdev an underling. 1282 * 1283 * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev); 1284 * Called to release previously enslaved netdev. 1285 * 1286 * struct net_device *(*ndo_get_xmit_slave)(struct net_device *dev, 1287 * struct sk_buff *skb, 1288 * bool all_slaves); 1289 * Get the xmit slave of master device. If all_slaves is true, function 1290 * assume all the slaves can transmit. 1291 * 1292 * Feature/offload setting functions. 1293 * netdev_features_t (*ndo_fix_features)(struct net_device *dev, 1294 * netdev_features_t features); 1295 * Adjusts the requested feature flags according to device-specific 1296 * constraints, and returns the resulting flags. Must not modify 1297 * the device state. 1298 * 1299 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features); 1300 * Called to update device configuration to new features. Passed 1301 * feature set might be less than what was returned by ndo_fix_features()). 1302 * Must return >0 or -errno if it changed dev->features itself. 1303 * 1304 * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[], 1305 * struct net_device *dev, 1306 * const unsigned char *addr, u16 vid, u16 flags, 1307 * struct netlink_ext_ack *extack); 1308 * Adds an FDB entry to dev for addr. 1309 * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[], 1310 * struct net_device *dev, 1311 * const unsigned char *addr, u16 vid) 1312 * Deletes the FDB entry from dev coresponding to addr. 1313 * int (*ndo_fdb_del_bulk)(struct nlmsghdr *nlh, struct net_device *dev, 1314 * struct netlink_ext_ack *extack); 1315 * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb, 1316 * struct net_device *dev, struct net_device *filter_dev, 1317 * int *idx) 1318 * Used to add FDB entries to dump requests. Implementers should add 1319 * entries to skb and update idx with the number of entries. 1320 * 1321 * int (*ndo_mdb_add)(struct net_device *dev, struct nlattr *tb[], 1322 * u16 nlmsg_flags, struct netlink_ext_ack *extack); 1323 * Adds an MDB entry to dev. 1324 * int (*ndo_mdb_del)(struct net_device *dev, struct nlattr *tb[], 1325 * struct netlink_ext_ack *extack); 1326 * Deletes the MDB entry from dev. 1327 * int (*ndo_mdb_dump)(struct net_device *dev, struct sk_buff *skb, 1328 * struct netlink_callback *cb); 1329 * Dumps MDB entries from dev. The first argument (marker) in the netlink 1330 * callback is used by core rtnetlink code. 1331 * 1332 * int (*ndo_bridge_setlink)(struct net_device *dev, struct nlmsghdr *nlh, 1333 * u16 flags, struct netlink_ext_ack *extack) 1334 * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq, 1335 * struct net_device *dev, u32 filter_mask, 1336 * int nlflags) 1337 * int (*ndo_bridge_dellink)(struct net_device *dev, struct nlmsghdr *nlh, 1338 * u16 flags); 1339 * 1340 * int (*ndo_change_carrier)(struct net_device *dev, bool new_carrier); 1341 * Called to change device carrier. Soft-devices (like dummy, team, etc) 1342 * which do not represent real hardware may define this to allow their 1343 * userspace components to manage their virtual carrier state. Devices 1344 * that determine carrier state from physical hardware properties (eg 1345 * network cables) or protocol-dependent mechanisms (eg 1346 * USB_CDC_NOTIFY_NETWORK_CONNECTION) should NOT implement this function. 1347 * 1348 * int (*ndo_get_phys_port_id)(struct net_device *dev, 1349 * struct netdev_phys_item_id *ppid); 1350 * Called to get ID of physical port of this device. If driver does 1351 * not implement this, it is assumed that the hw is not able to have 1352 * multiple net devices on single physical port. 1353 * 1354 * int (*ndo_get_port_parent_id)(struct net_device *dev, 1355 * struct netdev_phys_item_id *ppid) 1356 * Called to get the parent ID of the physical port of this device. 1357 * 1358 * void* (*ndo_dfwd_add_station)(struct net_device *pdev, 1359 * struct net_device *dev) 1360 * Called by upper layer devices to accelerate switching or other 1361 * station functionality into hardware. 'pdev is the lowerdev 1362 * to use for the offload and 'dev' is the net device that will 1363 * back the offload. Returns a pointer to the private structure 1364 * the upper layer will maintain. 1365 * void (*ndo_dfwd_del_station)(struct net_device *pdev, void *priv) 1366 * Called by upper layer device to delete the station created 1367 * by 'ndo_dfwd_add_station'. 'pdev' is the net device backing 1368 * the station and priv is the structure returned by the add 1369 * operation. 1370 * int (*ndo_set_tx_maxrate)(struct net_device *dev, 1371 * int queue_index, u32 maxrate); 1372 * Called when a user wants to set a max-rate limitation of specific 1373 * TX queue. 1374 * int (*ndo_get_iflink)(const struct net_device *dev); 1375 * Called to get the iflink value of this device. 1376 * int (*ndo_fill_metadata_dst)(struct net_device *dev, struct sk_buff *skb); 1377 * This function is used to get egress tunnel information for given skb. 1378 * This is useful for retrieving outer tunnel header parameters while 1379 * sampling packet. 1380 * void (*ndo_set_rx_headroom)(struct net_device *dev, int needed_headroom); 1381 * This function is used to specify the headroom that the skb must 1382 * consider when allocation skb during packet reception. Setting 1383 * appropriate rx headroom value allows avoiding skb head copy on 1384 * forward. Setting a negative value resets the rx headroom to the 1385 * default value. 1386 * int (*ndo_bpf)(struct net_device *dev, struct netdev_bpf *bpf); 1387 * This function is used to set or query state related to XDP on the 1388 * netdevice and manage BPF offload. See definition of 1389 * enum bpf_netdev_command for details. 1390 * int (*ndo_xdp_xmit)(struct net_device *dev, int n, struct xdp_frame **xdp, 1391 * u32 flags); 1392 * This function is used to submit @n XDP packets for transmit on a 1393 * netdevice. Returns number of frames successfully transmitted, frames 1394 * that got dropped are freed/returned via xdp_return_frame(). 1395 * Returns negative number, means general error invoking ndo, meaning 1396 * no frames were xmit'ed and core-caller will free all frames. 1397 * struct net_device *(*ndo_xdp_get_xmit_slave)(struct net_device *dev, 1398 * struct xdp_buff *xdp); 1399 * Get the xmit slave of master device based on the xdp_buff. 1400 * int (*ndo_xsk_wakeup)(struct net_device *dev, u32 queue_id, u32 flags); 1401 * This function is used to wake up the softirq, ksoftirqd or kthread 1402 * responsible for sending and/or receiving packets on a specific 1403 * queue id bound to an AF_XDP socket. The flags field specifies if 1404 * only RX, only Tx, or both should be woken up using the flags 1405 * XDP_WAKEUP_RX and XDP_WAKEUP_TX. 1406 * int (*ndo_tunnel_ctl)(struct net_device *dev, struct ip_tunnel_parm *p, 1407 * int cmd); 1408 * Add, change, delete or get information on an IPv4 tunnel. 1409 * struct net_device *(*ndo_get_peer_dev)(struct net_device *dev); 1410 * If a device is paired with a peer device, return the peer instance. 1411 * The caller must be under RCU read context. 1412 * int (*ndo_fill_forward_path)(struct net_device_path_ctx *ctx, struct net_device_path *path); 1413 * Get the forwarding path to reach the real device from the HW destination address 1414 * ktime_t (*ndo_get_tstamp)(struct net_device *dev, 1415 * const struct skb_shared_hwtstamps *hwtstamps, 1416 * bool cycles); 1417 * Get hardware timestamp based on normal/adjustable time or free running 1418 * cycle counter. This function is required if physical clock supports a 1419 * free running cycle counter. 1420 * 1421 * int (*ndo_hwtstamp_get)(struct net_device *dev, 1422 * struct kernel_hwtstamp_config *kernel_config); 1423 * Get the currently configured hardware timestamping parameters for the 1424 * NIC device. 1425 * 1426 * int (*ndo_hwtstamp_set)(struct net_device *dev, 1427 * struct kernel_hwtstamp_config *kernel_config, 1428 * struct netlink_ext_ack *extack); 1429 * Change the hardware timestamping parameters for NIC device. 1430 */ 1431 struct net_device_ops { 1432 int (*ndo_init)(struct net_device *dev); 1433 void (*ndo_uninit)(struct net_device *dev); 1434 int (*ndo_open)(struct net_device *dev); 1435 int (*ndo_stop)(struct net_device *dev); 1436 netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb, 1437 struct net_device *dev); 1438 netdev_features_t (*ndo_features_check)(struct sk_buff *skb, 1439 struct net_device *dev, 1440 netdev_features_t features); 1441 u16 (*ndo_select_queue)(struct net_device *dev, 1442 struct sk_buff *skb, 1443 struct net_device *sb_dev); 1444 void (*ndo_change_rx_flags)(struct net_device *dev, 1445 int flags); 1446 void (*ndo_set_rx_mode)(struct net_device *dev); 1447 int (*ndo_set_mac_address)(struct net_device *dev, 1448 void *addr); 1449 int (*ndo_validate_addr)(struct net_device *dev); 1450 int (*ndo_do_ioctl)(struct net_device *dev, 1451 struct ifreq *ifr, int cmd); 1452 int (*ndo_eth_ioctl)(struct net_device *dev, 1453 struct ifreq *ifr, int cmd); 1454 int (*ndo_siocbond)(struct net_device *dev, 1455 struct ifreq *ifr, int cmd); 1456 int (*ndo_siocwandev)(struct net_device *dev, 1457 struct if_settings *ifs); 1458 int (*ndo_siocdevprivate)(struct net_device *dev, 1459 struct ifreq *ifr, 1460 void __user *data, int cmd); 1461 int (*ndo_set_config)(struct net_device *dev, 1462 struct ifmap *map); 1463 int (*ndo_change_mtu)(struct net_device *dev, 1464 int new_mtu); 1465 int (*ndo_neigh_setup)(struct net_device *dev, 1466 struct neigh_parms *); 1467 void (*ndo_tx_timeout) (struct net_device *dev, 1468 unsigned int txqueue); 1469 1470 void (*ndo_get_stats64)(struct net_device *dev, 1471 struct rtnl_link_stats64 *storage); 1472 bool (*ndo_has_offload_stats)(const struct net_device *dev, int attr_id); 1473 int (*ndo_get_offload_stats)(int attr_id, 1474 const struct net_device *dev, 1475 void *attr_data); 1476 struct net_device_stats* (*ndo_get_stats)(struct net_device *dev); 1477 1478 int (*ndo_vlan_rx_add_vid)(struct net_device *dev, 1479 __be16 proto, u16 vid); 1480 int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, 1481 __be16 proto, u16 vid); 1482 #ifdef CONFIG_NET_POLL_CONTROLLER 1483 void (*ndo_poll_controller)(struct net_device *dev); 1484 int (*ndo_netpoll_setup)(struct net_device *dev, 1485 struct netpoll_info *info); 1486 void (*ndo_netpoll_cleanup)(struct net_device *dev); 1487 #endif 1488 int (*ndo_set_vf_mac)(struct net_device *dev, 1489 int queue, u8 *mac); 1490 int (*ndo_set_vf_vlan)(struct net_device *dev, 1491 int queue, u16 vlan, 1492 u8 qos, __be16 proto); 1493 int (*ndo_set_vf_rate)(struct net_device *dev, 1494 int vf, int min_tx_rate, 1495 int max_tx_rate); 1496 int (*ndo_set_vf_spoofchk)(struct net_device *dev, 1497 int vf, bool setting); 1498 int (*ndo_set_vf_trust)(struct net_device *dev, 1499 int vf, bool setting); 1500 int (*ndo_get_vf_config)(struct net_device *dev, 1501 int vf, 1502 struct ifla_vf_info *ivf); 1503 int (*ndo_set_vf_link_state)(struct net_device *dev, 1504 int vf, int link_state); 1505 int (*ndo_get_vf_stats)(struct net_device *dev, 1506 int vf, 1507 struct ifla_vf_stats 1508 *vf_stats); 1509 int (*ndo_set_vf_port)(struct net_device *dev, 1510 int vf, 1511 struct nlattr *port[]); 1512 int (*ndo_get_vf_port)(struct net_device *dev, 1513 int vf, struct sk_buff *skb); 1514 int (*ndo_get_vf_guid)(struct net_device *dev, 1515 int vf, 1516 struct ifla_vf_guid *node_guid, 1517 struct ifla_vf_guid *port_guid); 1518 int (*ndo_set_vf_guid)(struct net_device *dev, 1519 int vf, u64 guid, 1520 int guid_type); 1521 int (*ndo_set_vf_rss_query_en)( 1522 struct net_device *dev, 1523 int vf, bool setting); 1524 int (*ndo_setup_tc)(struct net_device *dev, 1525 enum tc_setup_type type, 1526 void *type_data); 1527 #if IS_ENABLED(CONFIG_FCOE) 1528 int (*ndo_fcoe_enable)(struct net_device *dev); 1529 int (*ndo_fcoe_disable)(struct net_device *dev); 1530 int (*ndo_fcoe_ddp_setup)(struct net_device *dev, 1531 u16 xid, 1532 struct scatterlist *sgl, 1533 unsigned int sgc); 1534 int (*ndo_fcoe_ddp_done)(struct net_device *dev, 1535 u16 xid); 1536 int (*ndo_fcoe_ddp_target)(struct net_device *dev, 1537 u16 xid, 1538 struct scatterlist *sgl, 1539 unsigned int sgc); 1540 int (*ndo_fcoe_get_hbainfo)(struct net_device *dev, 1541 struct netdev_fcoe_hbainfo *hbainfo); 1542 #endif 1543 1544 #if IS_ENABLED(CONFIG_LIBFCOE) 1545 #define NETDEV_FCOE_WWNN 0 1546 #define NETDEV_FCOE_WWPN 1 1547 int (*ndo_fcoe_get_wwn)(struct net_device *dev, 1548 u64 *wwn, int type); 1549 #endif 1550 1551 #ifdef CONFIG_RFS_ACCEL 1552 int (*ndo_rx_flow_steer)(struct net_device *dev, 1553 const struct sk_buff *skb, 1554 u16 rxq_index, 1555 u32 flow_id); 1556 #endif 1557 int (*ndo_add_slave)(struct net_device *dev, 1558 struct net_device *slave_dev, 1559 struct netlink_ext_ack *extack); 1560 int (*ndo_del_slave)(struct net_device *dev, 1561 struct net_device *slave_dev); 1562 struct net_device* (*ndo_get_xmit_slave)(struct net_device *dev, 1563 struct sk_buff *skb, 1564 bool all_slaves); 1565 struct net_device* (*ndo_sk_get_lower_dev)(struct net_device *dev, 1566 struct sock *sk); 1567 netdev_features_t (*ndo_fix_features)(struct net_device *dev, 1568 netdev_features_t features); 1569 int (*ndo_set_features)(struct net_device *dev, 1570 netdev_features_t features); 1571 int (*ndo_neigh_construct)(struct net_device *dev, 1572 struct neighbour *n); 1573 void (*ndo_neigh_destroy)(struct net_device *dev, 1574 struct neighbour *n); 1575 1576 int (*ndo_fdb_add)(struct ndmsg *ndm, 1577 struct nlattr *tb[], 1578 struct net_device *dev, 1579 const unsigned char *addr, 1580 u16 vid, 1581 u16 flags, 1582 struct netlink_ext_ack *extack); 1583 int (*ndo_fdb_del)(struct ndmsg *ndm, 1584 struct nlattr *tb[], 1585 struct net_device *dev, 1586 const unsigned char *addr, 1587 u16 vid, struct netlink_ext_ack *extack); 1588 int (*ndo_fdb_del_bulk)(struct nlmsghdr *nlh, 1589 struct net_device *dev, 1590 struct netlink_ext_ack *extack); 1591 int (*ndo_fdb_dump)(struct sk_buff *skb, 1592 struct netlink_callback *cb, 1593 struct net_device *dev, 1594 struct net_device *filter_dev, 1595 int *idx); 1596 int (*ndo_fdb_get)(struct sk_buff *skb, 1597 struct nlattr *tb[], 1598 struct net_device *dev, 1599 const unsigned char *addr, 1600 u16 vid, u32 portid, u32 seq, 1601 struct netlink_ext_ack *extack); 1602 int (*ndo_mdb_add)(struct net_device *dev, 1603 struct nlattr *tb[], 1604 u16 nlmsg_flags, 1605 struct netlink_ext_ack *extack); 1606 int (*ndo_mdb_del)(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_bridge_setlink)(struct net_device *dev, 1613 struct nlmsghdr *nlh, 1614 u16 flags, 1615 struct netlink_ext_ack *extack); 1616 int (*ndo_bridge_getlink)(struct sk_buff *skb, 1617 u32 pid, u32 seq, 1618 struct net_device *dev, 1619 u32 filter_mask, 1620 int nlflags); 1621 int (*ndo_bridge_dellink)(struct net_device *dev, 1622 struct nlmsghdr *nlh, 1623 u16 flags); 1624 int (*ndo_change_carrier)(struct net_device *dev, 1625 bool new_carrier); 1626 int (*ndo_get_phys_port_id)(struct net_device *dev, 1627 struct netdev_phys_item_id *ppid); 1628 int (*ndo_get_port_parent_id)(struct net_device *dev, 1629 struct netdev_phys_item_id *ppid); 1630 int (*ndo_get_phys_port_name)(struct net_device *dev, 1631 char *name, size_t len); 1632 void* (*ndo_dfwd_add_station)(struct net_device *pdev, 1633 struct net_device *dev); 1634 void (*ndo_dfwd_del_station)(struct net_device *pdev, 1635 void *priv); 1636 1637 int (*ndo_set_tx_maxrate)(struct net_device *dev, 1638 int queue_index, 1639 u32 maxrate); 1640 int (*ndo_get_iflink)(const struct net_device *dev); 1641 int (*ndo_fill_metadata_dst)(struct net_device *dev, 1642 struct sk_buff *skb); 1643 void (*ndo_set_rx_headroom)(struct net_device *dev, 1644 int needed_headroom); 1645 int (*ndo_bpf)(struct net_device *dev, 1646 struct netdev_bpf *bpf); 1647 int (*ndo_xdp_xmit)(struct net_device *dev, int n, 1648 struct xdp_frame **xdp, 1649 u32 flags); 1650 struct net_device * (*ndo_xdp_get_xmit_slave)(struct net_device *dev, 1651 struct xdp_buff *xdp); 1652 int (*ndo_xsk_wakeup)(struct net_device *dev, 1653 u32 queue_id, u32 flags); 1654 int (*ndo_tunnel_ctl)(struct net_device *dev, 1655 struct ip_tunnel_parm *p, int cmd); 1656 struct net_device * (*ndo_get_peer_dev)(struct net_device *dev); 1657 int (*ndo_fill_forward_path)(struct net_device_path_ctx *ctx, 1658 struct net_device_path *path); 1659 ktime_t (*ndo_get_tstamp)(struct net_device *dev, 1660 const struct skb_shared_hwtstamps *hwtstamps, 1661 bool cycles); 1662 int (*ndo_hwtstamp_get)(struct net_device *dev, 1663 struct kernel_hwtstamp_config *kernel_config); 1664 int (*ndo_hwtstamp_set)(struct net_device *dev, 1665 struct kernel_hwtstamp_config *kernel_config, 1666 struct netlink_ext_ack *extack); 1667 }; 1668 1669 /** 1670 * enum netdev_priv_flags - &struct net_device priv_flags 1671 * 1672 * These are the &struct net_device, they are only set internally 1673 * by drivers and used in the kernel. These flags are invisible to 1674 * userspace; this means that the order of these flags can change 1675 * during any kernel release. 1676 * 1677 * You should have a pretty good reason to be extending these flags. 1678 * 1679 * @IFF_802_1Q_VLAN: 802.1Q VLAN device 1680 * @IFF_EBRIDGE: Ethernet bridging device 1681 * @IFF_BONDING: bonding master or slave 1682 * @IFF_ISATAP: ISATAP interface (RFC4214) 1683 * @IFF_WAN_HDLC: WAN HDLC device 1684 * @IFF_XMIT_DST_RELEASE: dev_hard_start_xmit() is allowed to 1685 * release skb->dst 1686 * @IFF_DONT_BRIDGE: disallow bridging this ether dev 1687 * @IFF_DISABLE_NETPOLL: disable netpoll at run-time 1688 * @IFF_MACVLAN_PORT: device used as macvlan port 1689 * @IFF_BRIDGE_PORT: device used as bridge port 1690 * @IFF_OVS_DATAPATH: device used as Open vSwitch datapath port 1691 * @IFF_TX_SKB_SHARING: The interface supports sharing skbs on transmit 1692 * @IFF_UNICAST_FLT: Supports unicast filtering 1693 * @IFF_TEAM_PORT: device used as team port 1694 * @IFF_SUPP_NOFCS: device supports sending custom FCS 1695 * @IFF_LIVE_ADDR_CHANGE: device supports hardware address 1696 * change when it's running 1697 * @IFF_MACVLAN: Macvlan device 1698 * @IFF_XMIT_DST_RELEASE_PERM: IFF_XMIT_DST_RELEASE not taking into account 1699 * underlying stacked devices 1700 * @IFF_L3MDEV_MASTER: device is an L3 master device 1701 * @IFF_NO_QUEUE: device can run without qdisc attached 1702 * @IFF_OPENVSWITCH: device is a Open vSwitch master 1703 * @IFF_L3MDEV_SLAVE: device is enslaved to an L3 master device 1704 * @IFF_TEAM: device is a team device 1705 * @IFF_RXFH_CONFIGURED: device has had Rx Flow indirection table configured 1706 * @IFF_PHONY_HEADROOM: the headroom value is controlled by an external 1707 * entity (i.e. the master device for bridged veth) 1708 * @IFF_MACSEC: device is a MACsec device 1709 * @IFF_NO_RX_HANDLER: device doesn't support the rx_handler hook 1710 * @IFF_FAILOVER: device is a failover master device 1711 * @IFF_FAILOVER_SLAVE: device is lower dev of a failover master device 1712 * @IFF_L3MDEV_RX_HANDLER: only invoke the rx handler of L3 master device 1713 * @IFF_NO_ADDRCONF: prevent ipv6 addrconf 1714 * @IFF_TX_SKB_NO_LINEAR: device/driver is capable of xmitting frames with 1715 * skb_headlen(skb) == 0 (data starts from frag0) 1716 * @IFF_CHANGE_PROTO_DOWN: device supports setting carrier via IFLA_PROTO_DOWN 1717 * @IFF_SEE_ALL_HWTSTAMP_REQUESTS: device wants to see calls to 1718 * ndo_hwtstamp_set() for all timestamp requests regardless of source, 1719 * even if those aren't HWTSTAMP_SOURCE_NETDEV. 1720 */ 1721 enum netdev_priv_flags { 1722 IFF_802_1Q_VLAN = 1<<0, 1723 IFF_EBRIDGE = 1<<1, 1724 IFF_BONDING = 1<<2, 1725 IFF_ISATAP = 1<<3, 1726 IFF_WAN_HDLC = 1<<4, 1727 IFF_XMIT_DST_RELEASE = 1<<5, 1728 IFF_DONT_BRIDGE = 1<<6, 1729 IFF_DISABLE_NETPOLL = 1<<7, 1730 IFF_MACVLAN_PORT = 1<<8, 1731 IFF_BRIDGE_PORT = 1<<9, 1732 IFF_OVS_DATAPATH = 1<<10, 1733 IFF_TX_SKB_SHARING = 1<<11, 1734 IFF_UNICAST_FLT = 1<<12, 1735 IFF_TEAM_PORT = 1<<13, 1736 IFF_SUPP_NOFCS = 1<<14, 1737 IFF_LIVE_ADDR_CHANGE = 1<<15, 1738 IFF_MACVLAN = 1<<16, 1739 IFF_XMIT_DST_RELEASE_PERM = 1<<17, 1740 IFF_L3MDEV_MASTER = 1<<18, 1741 IFF_NO_QUEUE = 1<<19, 1742 IFF_OPENVSWITCH = 1<<20, 1743 IFF_L3MDEV_SLAVE = 1<<21, 1744 IFF_TEAM = 1<<22, 1745 IFF_RXFH_CONFIGURED = 1<<23, 1746 IFF_PHONY_HEADROOM = 1<<24, 1747 IFF_MACSEC = 1<<25, 1748 IFF_NO_RX_HANDLER = 1<<26, 1749 IFF_FAILOVER = 1<<27, 1750 IFF_FAILOVER_SLAVE = 1<<28, 1751 IFF_L3MDEV_RX_HANDLER = 1<<29, 1752 IFF_NO_ADDRCONF = BIT_ULL(30), 1753 IFF_TX_SKB_NO_LINEAR = BIT_ULL(31), 1754 IFF_CHANGE_PROTO_DOWN = BIT_ULL(32), 1755 IFF_SEE_ALL_HWTSTAMP_REQUESTS = BIT_ULL(33), 1756 }; 1757 1758 #define IFF_802_1Q_VLAN IFF_802_1Q_VLAN 1759 #define IFF_EBRIDGE IFF_EBRIDGE 1760 #define IFF_BONDING IFF_BONDING 1761 #define IFF_ISATAP IFF_ISATAP 1762 #define IFF_WAN_HDLC IFF_WAN_HDLC 1763 #define IFF_XMIT_DST_RELEASE IFF_XMIT_DST_RELEASE 1764 #define IFF_DONT_BRIDGE IFF_DONT_BRIDGE 1765 #define IFF_DISABLE_NETPOLL IFF_DISABLE_NETPOLL 1766 #define IFF_MACVLAN_PORT IFF_MACVLAN_PORT 1767 #define IFF_BRIDGE_PORT IFF_BRIDGE_PORT 1768 #define IFF_OVS_DATAPATH IFF_OVS_DATAPATH 1769 #define IFF_TX_SKB_SHARING IFF_TX_SKB_SHARING 1770 #define IFF_UNICAST_FLT IFF_UNICAST_FLT 1771 #define IFF_TEAM_PORT IFF_TEAM_PORT 1772 #define IFF_SUPP_NOFCS IFF_SUPP_NOFCS 1773 #define IFF_LIVE_ADDR_CHANGE IFF_LIVE_ADDR_CHANGE 1774 #define IFF_MACVLAN IFF_MACVLAN 1775 #define IFF_XMIT_DST_RELEASE_PERM IFF_XMIT_DST_RELEASE_PERM 1776 #define IFF_L3MDEV_MASTER IFF_L3MDEV_MASTER 1777 #define IFF_NO_QUEUE IFF_NO_QUEUE 1778 #define IFF_OPENVSWITCH IFF_OPENVSWITCH 1779 #define IFF_L3MDEV_SLAVE IFF_L3MDEV_SLAVE 1780 #define IFF_TEAM IFF_TEAM 1781 #define IFF_RXFH_CONFIGURED IFF_RXFH_CONFIGURED 1782 #define IFF_PHONY_HEADROOM IFF_PHONY_HEADROOM 1783 #define IFF_MACSEC IFF_MACSEC 1784 #define IFF_NO_RX_HANDLER IFF_NO_RX_HANDLER 1785 #define IFF_FAILOVER IFF_FAILOVER 1786 #define IFF_FAILOVER_SLAVE IFF_FAILOVER_SLAVE 1787 #define IFF_L3MDEV_RX_HANDLER IFF_L3MDEV_RX_HANDLER 1788 #define IFF_TX_SKB_NO_LINEAR IFF_TX_SKB_NO_LINEAR 1789 1790 /* Specifies the type of the struct net_device::ml_priv pointer */ 1791 enum netdev_ml_priv_type { 1792 ML_PRIV_NONE, 1793 ML_PRIV_CAN, 1794 }; 1795 1796 /** 1797 * struct net_device - The DEVICE structure. 1798 * 1799 * Actually, this whole structure is a big mistake. It mixes I/O 1800 * data with strictly "high-level" data, and it has to know about 1801 * almost every data structure used in the INET module. 1802 * 1803 * @name: This is the first field of the "visible" part of this structure 1804 * (i.e. as seen by users in the "Space.c" file). It is the name 1805 * of the interface. 1806 * 1807 * @name_node: Name hashlist node 1808 * @ifalias: SNMP alias 1809 * @mem_end: Shared memory end 1810 * @mem_start: Shared memory start 1811 * @base_addr: Device I/O address 1812 * @irq: Device IRQ number 1813 * 1814 * @state: Generic network queuing layer state, see netdev_state_t 1815 * @dev_list: The global list of network devices 1816 * @napi_list: List entry used for polling NAPI devices 1817 * @unreg_list: List entry when we are unregistering the 1818 * device; see the function unregister_netdev 1819 * @close_list: List entry used when we are closing the device 1820 * @ptype_all: Device-specific packet handlers for all protocols 1821 * @ptype_specific: Device-specific, protocol-specific packet handlers 1822 * 1823 * @adj_list: Directly linked devices, like slaves for bonding 1824 * @features: Currently active device features 1825 * @hw_features: User-changeable features 1826 * 1827 * @wanted_features: User-requested features 1828 * @vlan_features: Mask of features inheritable by VLAN devices 1829 * 1830 * @hw_enc_features: Mask of features inherited by encapsulating devices 1831 * This field indicates what encapsulation 1832 * offloads the hardware is capable of doing, 1833 * and drivers will need to set them appropriately. 1834 * 1835 * @mpls_features: Mask of features inheritable by MPLS 1836 * @gso_partial_features: value(s) from NETIF_F_GSO\* 1837 * 1838 * @ifindex: interface index 1839 * @group: The group the device belongs to 1840 * 1841 * @stats: Statistics struct, which was left as a legacy, use 1842 * rtnl_link_stats64 instead 1843 * 1844 * @core_stats: core networking counters, 1845 * do not use this in drivers 1846 * @carrier_up_count: Number of times the carrier has been up 1847 * @carrier_down_count: Number of times the carrier has been down 1848 * 1849 * @wireless_handlers: List of functions to handle Wireless Extensions, 1850 * instead of ioctl, 1851 * see <net/iw_handler.h> for details. 1852 * @wireless_data: Instance data managed by the core of wireless extensions 1853 * 1854 * @netdev_ops: Includes several pointers to callbacks, 1855 * if one wants to override the ndo_*() functions 1856 * @xdp_metadata_ops: Includes pointers to XDP metadata callbacks. 1857 * @ethtool_ops: Management operations 1858 * @l3mdev_ops: Layer 3 master device operations 1859 * @ndisc_ops: Includes callbacks for different IPv6 neighbour 1860 * discovery handling. Necessary for e.g. 6LoWPAN. 1861 * @xfrmdev_ops: Transformation offload operations 1862 * @tlsdev_ops: Transport Layer Security offload operations 1863 * @header_ops: Includes callbacks for creating,parsing,caching,etc 1864 * of Layer 2 headers. 1865 * 1866 * @flags: Interface flags (a la BSD) 1867 * @xdp_features: XDP capability supported by the device 1868 * @priv_flags: Like 'flags' but invisible to userspace, 1869 * see if.h for the definitions 1870 * @gflags: Global flags ( kept as legacy ) 1871 * @padded: How much padding added by alloc_netdev() 1872 * @operstate: RFC2863 operstate 1873 * @link_mode: Mapping policy to operstate 1874 * @if_port: Selectable AUI, TP, ... 1875 * @dma: DMA channel 1876 * @mtu: Interface MTU value 1877 * @min_mtu: Interface Minimum MTU value 1878 * @max_mtu: Interface Maximum MTU value 1879 * @type: Interface hardware type 1880 * @hard_header_len: Maximum hardware header length. 1881 * @min_header_len: Minimum hardware header length 1882 * 1883 * @needed_headroom: Extra headroom the hardware may need, but not in all 1884 * cases can this be guaranteed 1885 * @needed_tailroom: Extra tailroom the hardware may need, but not in all 1886 * cases can this be guaranteed. Some cases also use 1887 * LL_MAX_HEADER instead to allocate the skb 1888 * 1889 * interface address info: 1890 * 1891 * @perm_addr: Permanent hw address 1892 * @addr_assign_type: Hw address assignment type 1893 * @addr_len: Hardware address length 1894 * @upper_level: Maximum depth level of upper devices. 1895 * @lower_level: Maximum depth level of lower devices. 1896 * @neigh_priv_len: Used in neigh_alloc() 1897 * @dev_id: Used to differentiate devices that share 1898 * the same link layer address 1899 * @dev_port: Used to differentiate devices that share 1900 * the same function 1901 * @addr_list_lock: XXX: need comments on this one 1902 * @name_assign_type: network interface name assignment type 1903 * @uc_promisc: Counter that indicates promiscuous mode 1904 * has been enabled due to the need to listen to 1905 * additional unicast addresses in a device that 1906 * does not implement ndo_set_rx_mode() 1907 * @uc: unicast mac addresses 1908 * @mc: multicast mac addresses 1909 * @dev_addrs: list of device hw addresses 1910 * @queues_kset: Group of all Kobjects in the Tx and RX queues 1911 * @promiscuity: Number of times the NIC is told to work in 1912 * promiscuous mode; if it becomes 0 the NIC will 1913 * exit promiscuous mode 1914 * @allmulti: Counter, enables or disables allmulticast mode 1915 * 1916 * @vlan_info: VLAN info 1917 * @dsa_ptr: dsa specific data 1918 * @tipc_ptr: TIPC specific data 1919 * @atalk_ptr: AppleTalk link 1920 * @ip_ptr: IPv4 specific data 1921 * @ip6_ptr: IPv6 specific data 1922 * @ax25_ptr: AX.25 specific data 1923 * @ieee80211_ptr: IEEE 802.11 specific data, assign before registering 1924 * @ieee802154_ptr: IEEE 802.15.4 low-rate Wireless Personal Area Network 1925 * device struct 1926 * @mpls_ptr: mpls_dev struct pointer 1927 * @mctp_ptr: MCTP specific data 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 * @gro_flush_timeout: timeout for GRO layer in NAPI 1938 * @napi_defer_hard_irqs: If not zero, provides a counter that would 1939 * allow to avoid NIC hard IRQ, on busy queues. 1940 * 1941 * @rx_handler: handler for received packets 1942 * @rx_handler_data: XXX: need comments on this one 1943 * @tcx_ingress: BPF & clsact qdisc specific data for ingress processing 1944 * @ingress_queue: XXX: need comments on this one 1945 * @nf_hooks_ingress: netfilter hooks executed for ingress packets 1946 * @broadcast: hw bcast address 1947 * 1948 * @rx_cpu_rmap: CPU reverse-mapping for RX completion interrupts, 1949 * indexed by RX queue number. Assigned by driver. 1950 * This must only be set if the ndo_rx_flow_steer 1951 * operation is defined 1952 * @index_hlist: Device index hash chain 1953 * 1954 * @_tx: Array of TX queues 1955 * @num_tx_queues: Number of TX queues allocated at alloc_netdev_mq() time 1956 * @real_num_tx_queues: Number of TX queues currently active in device 1957 * @qdisc: Root qdisc from userspace point of view 1958 * @tx_queue_len: Max frames per queue allowed 1959 * @tx_global_lock: XXX: need comments on this one 1960 * @xdp_bulkq: XDP device bulk queue 1961 * @xps_maps: all CPUs/RXQs maps for XPS device 1962 * 1963 * @xps_maps: XXX: need comments on this one 1964 * @tcx_egress: BPF & clsact qdisc specific data for egress processing 1965 * @nf_hooks_egress: netfilter hooks executed for egress packets 1966 * @qdisc_hash: qdisc hash table 1967 * @watchdog_timeo: Represents the timeout that is used by 1968 * the watchdog (see dev_watchdog()) 1969 * @watchdog_timer: List of timers 1970 * 1971 * @proto_down_reason: reason a netdev interface is held down 1972 * @pcpu_refcnt: Number of references to this device 1973 * @dev_refcnt: Number of references to this device 1974 * @refcnt_tracker: Tracker directory for tracked references to this device 1975 * @todo_list: Delayed register/unregister 1976 * @link_watch_list: XXX: need comments on this one 1977 * 1978 * @reg_state: Register/unregister state machine 1979 * @dismantle: Device is going to be freed 1980 * @rtnl_link_state: This enum represents the phases of creating 1981 * a new link 1982 * 1983 * @needs_free_netdev: Should unregister perform free_netdev? 1984 * @priv_destructor: Called from unregister 1985 * @npinfo: XXX: need comments on this one 1986 * @nd_net: Network namespace this network device is inside 1987 * 1988 * @ml_priv: Mid-layer private 1989 * @ml_priv_type: Mid-layer private type 1990 * @lstats: Loopback statistics 1991 * @tstats: Tunnel statistics 1992 * @dstats: Dummy statistics 1993 * @vstats: Virtual ethernet statistics 1994 * 1995 * @garp_port: GARP 1996 * @mrp_port: MRP 1997 * 1998 * @dm_private: Drop monitor private 1999 * 2000 * @dev: Class/net/name entry 2001 * @sysfs_groups: Space for optional device, statistics and wireless 2002 * sysfs groups 2003 * 2004 * @sysfs_rx_queue_group: Space for optional per-rx queue attributes 2005 * @rtnl_link_ops: Rtnl_link_ops 2006 * 2007 * @gso_max_size: Maximum size of generic segmentation offload 2008 * @tso_max_size: Device (as in HW) limit on the max TSO request size 2009 * @gso_max_segs: Maximum number of segments that can be passed to the 2010 * NIC for GSO 2011 * @tso_max_segs: Device (as in HW) limit on the max TSO segment count 2012 * @gso_ipv4_max_size: Maximum size of generic segmentation offload, 2013 * for IPv4. 2014 * 2015 * @dcbnl_ops: Data Center Bridging netlink ops 2016 * @num_tc: Number of traffic classes in the net device 2017 * @tc_to_txq: XXX: need comments on this one 2018 * @prio_tc_map: XXX: need comments on this one 2019 * 2020 * @fcoe_ddp_xid: Max exchange id for FCoE LRO by ddp 2021 * 2022 * @priomap: XXX: need comments on this one 2023 * @phydev: Physical device may attach itself 2024 * for hardware timestamping 2025 * @sfp_bus: attached &struct sfp_bus structure. 2026 * 2027 * @qdisc_tx_busylock: lockdep class annotating Qdisc->busylock spinlock 2028 * 2029 * @proto_down: protocol port state information can be sent to the 2030 * switch driver and used to set the phys state of the 2031 * switch port. 2032 * 2033 * @wol_enabled: Wake-on-LAN is enabled 2034 * 2035 * @threaded: napi threaded mode is enabled 2036 * 2037 * @net_notifier_list: List of per-net netdev notifier block 2038 * that follow this device when it is moved 2039 * to another network namespace. 2040 * 2041 * @macsec_ops: MACsec offloading ops 2042 * 2043 * @udp_tunnel_nic_info: static structure describing the UDP tunnel 2044 * offload capabilities of the device 2045 * @udp_tunnel_nic: UDP tunnel offload state 2046 * @xdp_state: stores info on attached XDP BPF programs 2047 * 2048 * @nested_level: Used as a parameter of spin_lock_nested() of 2049 * dev->addr_list_lock. 2050 * @unlink_list: As netif_addr_lock() can be called recursively, 2051 * keep a list of interfaces to be deleted. 2052 * @gro_max_size: Maximum size of aggregated packet in generic 2053 * receive offload (GRO) 2054 * @gro_ipv4_max_size: Maximum size of aggregated packet in generic 2055 * receive offload (GRO), for IPv4. 2056 * @xdp_zc_max_segs: Maximum number of segments supported by AF_XDP 2057 * zero copy driver 2058 * 2059 * @dev_addr_shadow: Copy of @dev_addr to catch direct writes. 2060 * @linkwatch_dev_tracker: refcount tracker used by linkwatch. 2061 * @watchdog_dev_tracker: refcount tracker used by watchdog. 2062 * @dev_registered_tracker: tracker for reference held while 2063 * registered 2064 * @offload_xstats_l3: L3 HW stats for this netdevice. 2065 * 2066 * @devlink_port: Pointer to related devlink port structure. 2067 * Assigned by a driver before netdev registration using 2068 * SET_NETDEV_DEVLINK_PORT macro. This pointer is static 2069 * during the time netdevice is registered. 2070 * 2071 * @dpll_pin: Pointer to the SyncE source pin of a DPLL subsystem, 2072 * where the clock is recovered. 2073 * 2074 * FIXME: cleanup struct net_device such that network protocol info 2075 * moves out. 2076 */ 2077 2078 struct net_device { 2079 char name[IFNAMSIZ]; 2080 struct netdev_name_node *name_node; 2081 struct dev_ifalias __rcu *ifalias; 2082 /* 2083 * I/O specific fields 2084 * FIXME: Merge these and struct ifmap into one 2085 */ 2086 unsigned long mem_end; 2087 unsigned long mem_start; 2088 unsigned long base_addr; 2089 2090 /* 2091 * Some hardware also needs these fields (state,dev_list, 2092 * napi_list,unreg_list,close_list) but they are not 2093 * part of the usual set specified in Space.c. 2094 */ 2095 2096 unsigned long state; 2097 2098 struct list_head dev_list; 2099 struct list_head napi_list; 2100 struct list_head unreg_list; 2101 struct list_head close_list; 2102 struct list_head ptype_all; 2103 struct list_head ptype_specific; 2104 2105 struct { 2106 struct list_head upper; 2107 struct list_head lower; 2108 } adj_list; 2109 2110 /* Read-mostly cache-line for fast-path access */ 2111 unsigned int flags; 2112 xdp_features_t xdp_features; 2113 unsigned long long priv_flags; 2114 const struct net_device_ops *netdev_ops; 2115 const struct xdp_metadata_ops *xdp_metadata_ops; 2116 int ifindex; 2117 unsigned short gflags; 2118 unsigned short hard_header_len; 2119 2120 /* Note : dev->mtu is often read without holding a lock. 2121 * Writers usually hold RTNL. 2122 * It is recommended to use READ_ONCE() to annotate the reads, 2123 * and to use WRITE_ONCE() to annotate the writes. 2124 */ 2125 unsigned int mtu; 2126 unsigned short needed_headroom; 2127 unsigned short needed_tailroom; 2128 2129 netdev_features_t features; 2130 netdev_features_t hw_features; 2131 netdev_features_t wanted_features; 2132 netdev_features_t vlan_features; 2133 netdev_features_t hw_enc_features; 2134 netdev_features_t mpls_features; 2135 netdev_features_t gso_partial_features; 2136 2137 unsigned int min_mtu; 2138 unsigned int max_mtu; 2139 unsigned short type; 2140 unsigned char min_header_len; 2141 unsigned char name_assign_type; 2142 2143 int group; 2144 2145 struct net_device_stats stats; /* not used by modern drivers */ 2146 2147 struct net_device_core_stats __percpu *core_stats; 2148 2149 /* Stats to monitor link on/off, flapping */ 2150 atomic_t carrier_up_count; 2151 atomic_t carrier_down_count; 2152 2153 #ifdef CONFIG_WIRELESS_EXT 2154 const struct iw_handler_def *wireless_handlers; 2155 struct iw_public_data *wireless_data; 2156 #endif 2157 const struct ethtool_ops *ethtool_ops; 2158 #ifdef CONFIG_NET_L3_MASTER_DEV 2159 const struct l3mdev_ops *l3mdev_ops; 2160 #endif 2161 #if IS_ENABLED(CONFIG_IPV6) 2162 const struct ndisc_ops *ndisc_ops; 2163 #endif 2164 2165 #ifdef CONFIG_XFRM_OFFLOAD 2166 const struct xfrmdev_ops *xfrmdev_ops; 2167 #endif 2168 2169 #if IS_ENABLED(CONFIG_TLS_DEVICE) 2170 const struct tlsdev_ops *tlsdev_ops; 2171 #endif 2172 2173 const struct header_ops *header_ops; 2174 2175 unsigned char operstate; 2176 unsigned char link_mode; 2177 2178 unsigned char if_port; 2179 unsigned char dma; 2180 2181 /* Interface address info. */ 2182 unsigned char perm_addr[MAX_ADDR_LEN]; 2183 unsigned char addr_assign_type; 2184 unsigned char addr_len; 2185 unsigned char upper_level; 2186 unsigned char lower_level; 2187 2188 unsigned short neigh_priv_len; 2189 unsigned short dev_id; 2190 unsigned short dev_port; 2191 unsigned short padded; 2192 2193 spinlock_t addr_list_lock; 2194 int irq; 2195 2196 struct netdev_hw_addr_list uc; 2197 struct netdev_hw_addr_list mc; 2198 struct netdev_hw_addr_list dev_addrs; 2199 2200 #ifdef CONFIG_SYSFS 2201 struct kset *queues_kset; 2202 #endif 2203 #ifdef CONFIG_LOCKDEP 2204 struct list_head unlink_list; 2205 #endif 2206 unsigned int promiscuity; 2207 unsigned int allmulti; 2208 bool uc_promisc; 2209 #ifdef CONFIG_LOCKDEP 2210 unsigned char nested_level; 2211 #endif 2212 2213 2214 /* Protocol-specific pointers */ 2215 2216 struct in_device __rcu *ip_ptr; 2217 struct inet6_dev __rcu *ip6_ptr; 2218 #if IS_ENABLED(CONFIG_VLAN_8021Q) 2219 struct vlan_info __rcu *vlan_info; 2220 #endif 2221 #if IS_ENABLED(CONFIG_NET_DSA) 2222 struct dsa_port *dsa_ptr; 2223 #endif 2224 #if IS_ENABLED(CONFIG_TIPC) 2225 struct tipc_bearer __rcu *tipc_ptr; 2226 #endif 2227 #if IS_ENABLED(CONFIG_ATALK) 2228 void *atalk_ptr; 2229 #endif 2230 #if IS_ENABLED(CONFIG_AX25) 2231 void *ax25_ptr; 2232 #endif 2233 #if IS_ENABLED(CONFIG_CFG80211) 2234 struct wireless_dev *ieee80211_ptr; 2235 #endif 2236 #if IS_ENABLED(CONFIG_IEEE802154) || IS_ENABLED(CONFIG_6LOWPAN) 2237 struct wpan_dev *ieee802154_ptr; 2238 #endif 2239 #if IS_ENABLED(CONFIG_MPLS_ROUTING) 2240 struct mpls_dev __rcu *mpls_ptr; 2241 #endif 2242 #if IS_ENABLED(CONFIG_MCTP) 2243 struct mctp_dev __rcu *mctp_ptr; 2244 #endif 2245 2246 /* 2247 * Cache lines mostly used on receive path (including eth_type_trans()) 2248 */ 2249 /* Interface address info used in eth_type_trans() */ 2250 const unsigned char *dev_addr; 2251 2252 struct netdev_rx_queue *_rx; 2253 unsigned int num_rx_queues; 2254 unsigned int real_num_rx_queues; 2255 2256 struct bpf_prog __rcu *xdp_prog; 2257 unsigned long gro_flush_timeout; 2258 int napi_defer_hard_irqs; 2259 #define GRO_LEGACY_MAX_SIZE 65536u 2260 /* TCP minimal MSS is 8 (TCP_MIN_GSO_SIZE), 2261 * and shinfo->gso_segs is a 16bit field. 2262 */ 2263 #define GRO_MAX_SIZE (8 * 65535u) 2264 unsigned int gro_max_size; 2265 unsigned int gro_ipv4_max_size; 2266 unsigned int xdp_zc_max_segs; 2267 rx_handler_func_t __rcu *rx_handler; 2268 void __rcu *rx_handler_data; 2269 #ifdef CONFIG_NET_XGRESS 2270 struct bpf_mprog_entry __rcu *tcx_ingress; 2271 #endif 2272 struct netdev_queue __rcu *ingress_queue; 2273 #ifdef CONFIG_NETFILTER_INGRESS 2274 struct nf_hook_entries __rcu *nf_hooks_ingress; 2275 #endif 2276 2277 unsigned char broadcast[MAX_ADDR_LEN]; 2278 #ifdef CONFIG_RFS_ACCEL 2279 struct cpu_rmap *rx_cpu_rmap; 2280 #endif 2281 struct hlist_node index_hlist; 2282 2283 /* 2284 * Cache lines mostly used on transmit path 2285 */ 2286 struct netdev_queue *_tx ____cacheline_aligned_in_smp; 2287 unsigned int num_tx_queues; 2288 unsigned int real_num_tx_queues; 2289 struct Qdisc __rcu *qdisc; 2290 unsigned int tx_queue_len; 2291 spinlock_t tx_global_lock; 2292 2293 struct xdp_dev_bulk_queue __percpu *xdp_bulkq; 2294 2295 #ifdef CONFIG_XPS 2296 struct xps_dev_maps __rcu *xps_maps[XPS_MAPS_MAX]; 2297 #endif 2298 #ifdef CONFIG_NET_XGRESS 2299 struct bpf_mprog_entry __rcu *tcx_egress; 2300 #endif 2301 #ifdef CONFIG_NETFILTER_EGRESS 2302 struct nf_hook_entries __rcu *nf_hooks_egress; 2303 #endif 2304 2305 #ifdef CONFIG_NET_SCHED 2306 DECLARE_HASHTABLE (qdisc_hash, 4); 2307 #endif 2308 /* These may be needed for future network-power-down code. */ 2309 struct timer_list watchdog_timer; 2310 int watchdog_timeo; 2311 2312 u32 proto_down_reason; 2313 2314 struct list_head todo_list; 2315 2316 #ifdef CONFIG_PCPU_DEV_REFCNT 2317 int __percpu *pcpu_refcnt; 2318 #else 2319 refcount_t dev_refcnt; 2320 #endif 2321 struct ref_tracker_dir refcnt_tracker; 2322 2323 struct list_head link_watch_list; 2324 2325 enum { NETREG_UNINITIALIZED=0, 2326 NETREG_REGISTERED, /* completed register_netdevice */ 2327 NETREG_UNREGISTERING, /* called unregister_netdevice */ 2328 NETREG_UNREGISTERED, /* completed unregister todo */ 2329 NETREG_RELEASED, /* called free_netdev */ 2330 NETREG_DUMMY, /* dummy device for NAPI poll */ 2331 } reg_state:8; 2332 2333 bool dismantle; 2334 2335 enum { 2336 RTNL_LINK_INITIALIZED, 2337 RTNL_LINK_INITIALIZING, 2338 } rtnl_link_state:16; 2339 2340 bool needs_free_netdev; 2341 void (*priv_destructor)(struct net_device *dev); 2342 2343 #ifdef CONFIG_NETPOLL 2344 struct netpoll_info __rcu *npinfo; 2345 #endif 2346 2347 possible_net_t nd_net; 2348 2349 /* mid-layer private */ 2350 void *ml_priv; 2351 enum netdev_ml_priv_type ml_priv_type; 2352 2353 union { 2354 struct pcpu_lstats __percpu *lstats; 2355 struct pcpu_sw_netstats __percpu *tstats; 2356 struct pcpu_dstats __percpu *dstats; 2357 }; 2358 2359 #if IS_ENABLED(CONFIG_GARP) 2360 struct garp_port __rcu *garp_port; 2361 #endif 2362 #if IS_ENABLED(CONFIG_MRP) 2363 struct mrp_port __rcu *mrp_port; 2364 #endif 2365 #if IS_ENABLED(CONFIG_NET_DROP_MONITOR) 2366 struct dm_hw_stat_delta __rcu *dm_private; 2367 #endif 2368 struct device dev; 2369 const struct attribute_group *sysfs_groups[4]; 2370 const struct attribute_group *sysfs_rx_queue_group; 2371 2372 const struct rtnl_link_ops *rtnl_link_ops; 2373 2374 /* for setting kernel sock attribute on TCP connection setup */ 2375 #define GSO_MAX_SEGS 65535u 2376 #define GSO_LEGACY_MAX_SIZE 65536u 2377 /* TCP minimal MSS is 8 (TCP_MIN_GSO_SIZE), 2378 * and shinfo->gso_segs is a 16bit field. 2379 */ 2380 #define GSO_MAX_SIZE (8 * GSO_MAX_SEGS) 2381 2382 unsigned int gso_max_size; 2383 #define TSO_LEGACY_MAX_SIZE 65536 2384 #define TSO_MAX_SIZE UINT_MAX 2385 unsigned int tso_max_size; 2386 u16 gso_max_segs; 2387 #define TSO_MAX_SEGS U16_MAX 2388 u16 tso_max_segs; 2389 unsigned int gso_ipv4_max_size; 2390 2391 #ifdef CONFIG_DCB 2392 const struct dcbnl_rtnl_ops *dcbnl_ops; 2393 #endif 2394 s16 num_tc; 2395 struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE]; 2396 u8 prio_tc_map[TC_BITMASK + 1]; 2397 2398 #if IS_ENABLED(CONFIG_FCOE) 2399 unsigned int fcoe_ddp_xid; 2400 #endif 2401 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) 2402 struct netprio_map __rcu *priomap; 2403 #endif 2404 struct phy_device *phydev; 2405 struct sfp_bus *sfp_bus; 2406 struct lock_class_key *qdisc_tx_busylock; 2407 bool proto_down; 2408 unsigned wol_enabled:1; 2409 unsigned threaded:1; 2410 2411 struct list_head net_notifier_list; 2412 2413 #if IS_ENABLED(CONFIG_MACSEC) 2414 /* MACsec management functions */ 2415 const struct macsec_ops *macsec_ops; 2416 #endif 2417 const struct udp_tunnel_nic_info *udp_tunnel_nic_info; 2418 struct udp_tunnel_nic *udp_tunnel_nic; 2419 2420 /* protected by rtnl_lock */ 2421 struct bpf_xdp_entity xdp_state[__MAX_XDP_MODE]; 2422 2423 u8 dev_addr_shadow[MAX_ADDR_LEN]; 2424 netdevice_tracker linkwatch_dev_tracker; 2425 netdevice_tracker watchdog_dev_tracker; 2426 netdevice_tracker dev_registered_tracker; 2427 struct rtnl_hw_stats64 *offload_xstats_l3; 2428 2429 struct devlink_port *devlink_port; 2430 2431 #if IS_ENABLED(CONFIG_DPLL) 2432 struct dpll_pin *dpll_pin; 2433 #endif 2434 }; 2435 #define to_net_dev(d) container_of(d, struct net_device, dev) 2436 2437 /* 2438 * Driver should use this to assign devlink port instance to a netdevice 2439 * before it registers the netdevice. Therefore devlink_port is static 2440 * during the netdev lifetime after it is registered. 2441 */ 2442 #define SET_NETDEV_DEVLINK_PORT(dev, port) \ 2443 ({ \ 2444 WARN_ON((dev)->reg_state != NETREG_UNINITIALIZED); \ 2445 ((dev)->devlink_port = (port)); \ 2446 }) 2447 2448 static inline bool netif_elide_gro(const struct net_device *dev) 2449 { 2450 if (!(dev->features & NETIF_F_GRO) || dev->xdp_prog) 2451 return true; 2452 return false; 2453 } 2454 2455 #define NETDEV_ALIGN 32 2456 2457 static inline 2458 int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio) 2459 { 2460 return dev->prio_tc_map[prio & TC_BITMASK]; 2461 } 2462 2463 static inline 2464 int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc) 2465 { 2466 if (tc >= dev->num_tc) 2467 return -EINVAL; 2468 2469 dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK; 2470 return 0; 2471 } 2472 2473 int netdev_txq_to_tc(struct net_device *dev, unsigned int txq); 2474 void netdev_reset_tc(struct net_device *dev); 2475 int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset); 2476 int netdev_set_num_tc(struct net_device *dev, u8 num_tc); 2477 2478 static inline 2479 int netdev_get_num_tc(struct net_device *dev) 2480 { 2481 return dev->num_tc; 2482 } 2483 2484 static inline void net_prefetch(void *p) 2485 { 2486 prefetch(p); 2487 #if L1_CACHE_BYTES < 128 2488 prefetch((u8 *)p + L1_CACHE_BYTES); 2489 #endif 2490 } 2491 2492 static inline void net_prefetchw(void *p) 2493 { 2494 prefetchw(p); 2495 #if L1_CACHE_BYTES < 128 2496 prefetchw((u8 *)p + L1_CACHE_BYTES); 2497 #endif 2498 } 2499 2500 void netdev_unbind_sb_channel(struct net_device *dev, 2501 struct net_device *sb_dev); 2502 int netdev_bind_sb_channel_queue(struct net_device *dev, 2503 struct net_device *sb_dev, 2504 u8 tc, u16 count, u16 offset); 2505 int netdev_set_sb_channel(struct net_device *dev, u16 channel); 2506 static inline int netdev_get_sb_channel(struct net_device *dev) 2507 { 2508 return max_t(int, -dev->num_tc, 0); 2509 } 2510 2511 static inline 2512 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev, 2513 unsigned int index) 2514 { 2515 DEBUG_NET_WARN_ON_ONCE(index >= dev->num_tx_queues); 2516 return &dev->_tx[index]; 2517 } 2518 2519 static inline struct netdev_queue *skb_get_tx_queue(const struct net_device *dev, 2520 const struct sk_buff *skb) 2521 { 2522 return netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); 2523 } 2524 2525 static inline void netdev_for_each_tx_queue(struct net_device *dev, 2526 void (*f)(struct net_device *, 2527 struct netdev_queue *, 2528 void *), 2529 void *arg) 2530 { 2531 unsigned int i; 2532 2533 for (i = 0; i < dev->num_tx_queues; i++) 2534 f(dev, &dev->_tx[i], arg); 2535 } 2536 2537 #define netdev_lockdep_set_classes(dev) \ 2538 { \ 2539 static struct lock_class_key qdisc_tx_busylock_key; \ 2540 static struct lock_class_key qdisc_xmit_lock_key; \ 2541 static struct lock_class_key dev_addr_list_lock_key; \ 2542 unsigned int i; \ 2543 \ 2544 (dev)->qdisc_tx_busylock = &qdisc_tx_busylock_key; \ 2545 lockdep_set_class(&(dev)->addr_list_lock, \ 2546 &dev_addr_list_lock_key); \ 2547 for (i = 0; i < (dev)->num_tx_queues; i++) \ 2548 lockdep_set_class(&(dev)->_tx[i]._xmit_lock, \ 2549 &qdisc_xmit_lock_key); \ 2550 } 2551 2552 u16 netdev_pick_tx(struct net_device *dev, struct sk_buff *skb, 2553 struct net_device *sb_dev); 2554 struct netdev_queue *netdev_core_pick_tx(struct net_device *dev, 2555 struct sk_buff *skb, 2556 struct net_device *sb_dev); 2557 2558 /* returns the headroom that the master device needs to take in account 2559 * when forwarding to this dev 2560 */ 2561 static inline unsigned netdev_get_fwd_headroom(struct net_device *dev) 2562 { 2563 return dev->priv_flags & IFF_PHONY_HEADROOM ? 0 : dev->needed_headroom; 2564 } 2565 2566 static inline void netdev_set_rx_headroom(struct net_device *dev, int new_hr) 2567 { 2568 if (dev->netdev_ops->ndo_set_rx_headroom) 2569 dev->netdev_ops->ndo_set_rx_headroom(dev, new_hr); 2570 } 2571 2572 /* set the device rx headroom to the dev's default */ 2573 static inline void netdev_reset_rx_headroom(struct net_device *dev) 2574 { 2575 netdev_set_rx_headroom(dev, -1); 2576 } 2577 2578 static inline void *netdev_get_ml_priv(struct net_device *dev, 2579 enum netdev_ml_priv_type type) 2580 { 2581 if (dev->ml_priv_type != type) 2582 return NULL; 2583 2584 return dev->ml_priv; 2585 } 2586 2587 static inline void netdev_set_ml_priv(struct net_device *dev, 2588 void *ml_priv, 2589 enum netdev_ml_priv_type type) 2590 { 2591 WARN(dev->ml_priv_type && dev->ml_priv_type != type, 2592 "Overwriting already set ml_priv_type (%u) with different ml_priv_type (%u)!\n", 2593 dev->ml_priv_type, type); 2594 WARN(!dev->ml_priv_type && dev->ml_priv, 2595 "Overwriting already set ml_priv and ml_priv_type is ML_PRIV_NONE!\n"); 2596 2597 dev->ml_priv = ml_priv; 2598 dev->ml_priv_type = type; 2599 } 2600 2601 /* 2602 * Net namespace inlines 2603 */ 2604 static inline 2605 struct net *dev_net(const struct net_device *dev) 2606 { 2607 return read_pnet(&dev->nd_net); 2608 } 2609 2610 static inline 2611 void dev_net_set(struct net_device *dev, struct net *net) 2612 { 2613 write_pnet(&dev->nd_net, net); 2614 } 2615 2616 /** 2617 * netdev_priv - access network device private data 2618 * @dev: network device 2619 * 2620 * Get network device private data 2621 */ 2622 static inline void *netdev_priv(const struct net_device *dev) 2623 { 2624 return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN); 2625 } 2626 2627 /* Set the sysfs physical device reference for the network logical device 2628 * if set prior to registration will cause a symlink during initialization. 2629 */ 2630 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) 2631 2632 /* Set the sysfs device type for the network logical device to allow 2633 * fine-grained identification of different network device types. For 2634 * example Ethernet, Wireless LAN, Bluetooth, WiMAX etc. 2635 */ 2636 #define SET_NETDEV_DEVTYPE(net, devtype) ((net)->dev.type = (devtype)) 2637 2638 /* Default NAPI poll() weight 2639 * Device drivers are strongly advised to not use bigger value 2640 */ 2641 #define NAPI_POLL_WEIGHT 64 2642 2643 void netif_napi_add_weight(struct net_device *dev, struct napi_struct *napi, 2644 int (*poll)(struct napi_struct *, int), int weight); 2645 2646 /** 2647 * netif_napi_add() - initialize a NAPI context 2648 * @dev: network device 2649 * @napi: NAPI context 2650 * @poll: polling function 2651 * 2652 * netif_napi_add() must be used to initialize a NAPI context prior to calling 2653 * *any* of the other NAPI-related functions. 2654 */ 2655 static inline void 2656 netif_napi_add(struct net_device *dev, struct napi_struct *napi, 2657 int (*poll)(struct napi_struct *, int)) 2658 { 2659 netif_napi_add_weight(dev, napi, poll, NAPI_POLL_WEIGHT); 2660 } 2661 2662 static inline void 2663 netif_napi_add_tx_weight(struct net_device *dev, 2664 struct napi_struct *napi, 2665 int (*poll)(struct napi_struct *, int), 2666 int weight) 2667 { 2668 set_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state); 2669 netif_napi_add_weight(dev, napi, poll, weight); 2670 } 2671 2672 /** 2673 * netif_napi_add_tx() - initialize a NAPI context to be used for Tx only 2674 * @dev: network device 2675 * @napi: NAPI context 2676 * @poll: polling function 2677 * 2678 * This variant of netif_napi_add() should be used from drivers using NAPI 2679 * to exclusively poll a TX queue. 2680 * This will avoid we add it into napi_hash[], thus polluting this hash table. 2681 */ 2682 static inline void netif_napi_add_tx(struct net_device *dev, 2683 struct napi_struct *napi, 2684 int (*poll)(struct napi_struct *, int)) 2685 { 2686 netif_napi_add_tx_weight(dev, napi, poll, NAPI_POLL_WEIGHT); 2687 } 2688 2689 /** 2690 * __netif_napi_del - remove a NAPI context 2691 * @napi: NAPI context 2692 * 2693 * Warning: caller must observe RCU grace period before freeing memory 2694 * containing @napi. Drivers might want to call this helper to combine 2695 * all the needed RCU grace periods into a single one. 2696 */ 2697 void __netif_napi_del(struct napi_struct *napi); 2698 2699 /** 2700 * netif_napi_del - remove a NAPI context 2701 * @napi: NAPI context 2702 * 2703 * netif_napi_del() removes a NAPI context from the network device NAPI list 2704 */ 2705 static inline void netif_napi_del(struct napi_struct *napi) 2706 { 2707 __netif_napi_del(napi); 2708 synchronize_net(); 2709 } 2710 2711 struct packet_type { 2712 __be16 type; /* This is really htons(ether_type). */ 2713 bool ignore_outgoing; 2714 struct net_device *dev; /* NULL is wildcarded here */ 2715 netdevice_tracker dev_tracker; 2716 int (*func) (struct sk_buff *, 2717 struct net_device *, 2718 struct packet_type *, 2719 struct net_device *); 2720 void (*list_func) (struct list_head *, 2721 struct packet_type *, 2722 struct net_device *); 2723 bool (*id_match)(struct packet_type *ptype, 2724 struct sock *sk); 2725 struct net *af_packet_net; 2726 void *af_packet_priv; 2727 struct list_head list; 2728 }; 2729 2730 struct offload_callbacks { 2731 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 2732 netdev_features_t features); 2733 struct sk_buff *(*gro_receive)(struct list_head *head, 2734 struct sk_buff *skb); 2735 int (*gro_complete)(struct sk_buff *skb, int nhoff); 2736 }; 2737 2738 struct packet_offload { 2739 __be16 type; /* This is really htons(ether_type). */ 2740 u16 priority; 2741 struct offload_callbacks callbacks; 2742 struct list_head list; 2743 }; 2744 2745 /* often modified stats are per-CPU, other are shared (netdev->stats) */ 2746 struct pcpu_sw_netstats { 2747 u64_stats_t rx_packets; 2748 u64_stats_t rx_bytes; 2749 u64_stats_t tx_packets; 2750 u64_stats_t tx_bytes; 2751 struct u64_stats_sync syncp; 2752 } __aligned(4 * sizeof(u64)); 2753 2754 struct pcpu_lstats { 2755 u64_stats_t packets; 2756 u64_stats_t bytes; 2757 struct u64_stats_sync syncp; 2758 } __aligned(2 * sizeof(u64)); 2759 2760 void dev_lstats_read(struct net_device *dev, u64 *packets, u64 *bytes); 2761 2762 static inline void dev_sw_netstats_rx_add(struct net_device *dev, unsigned int len) 2763 { 2764 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 2765 2766 u64_stats_update_begin(&tstats->syncp); 2767 u64_stats_add(&tstats->rx_bytes, len); 2768 u64_stats_inc(&tstats->rx_packets); 2769 u64_stats_update_end(&tstats->syncp); 2770 } 2771 2772 static inline void dev_sw_netstats_tx_add(struct net_device *dev, 2773 unsigned int packets, 2774 unsigned int len) 2775 { 2776 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 2777 2778 u64_stats_update_begin(&tstats->syncp); 2779 u64_stats_add(&tstats->tx_bytes, len); 2780 u64_stats_add(&tstats->tx_packets, packets); 2781 u64_stats_update_end(&tstats->syncp); 2782 } 2783 2784 static inline void dev_lstats_add(struct net_device *dev, unsigned int len) 2785 { 2786 struct pcpu_lstats *lstats = this_cpu_ptr(dev->lstats); 2787 2788 u64_stats_update_begin(&lstats->syncp); 2789 u64_stats_add(&lstats->bytes, len); 2790 u64_stats_inc(&lstats->packets); 2791 u64_stats_update_end(&lstats->syncp); 2792 } 2793 2794 #define __netdev_alloc_pcpu_stats(type, gfp) \ 2795 ({ \ 2796 typeof(type) __percpu *pcpu_stats = alloc_percpu_gfp(type, gfp);\ 2797 if (pcpu_stats) { \ 2798 int __cpu; \ 2799 for_each_possible_cpu(__cpu) { \ 2800 typeof(type) *stat; \ 2801 stat = per_cpu_ptr(pcpu_stats, __cpu); \ 2802 u64_stats_init(&stat->syncp); \ 2803 } \ 2804 } \ 2805 pcpu_stats; \ 2806 }) 2807 2808 #define netdev_alloc_pcpu_stats(type) \ 2809 __netdev_alloc_pcpu_stats(type, GFP_KERNEL) 2810 2811 #define devm_netdev_alloc_pcpu_stats(dev, type) \ 2812 ({ \ 2813 typeof(type) __percpu *pcpu_stats = devm_alloc_percpu(dev, type);\ 2814 if (pcpu_stats) { \ 2815 int __cpu; \ 2816 for_each_possible_cpu(__cpu) { \ 2817 typeof(type) *stat; \ 2818 stat = per_cpu_ptr(pcpu_stats, __cpu); \ 2819 u64_stats_init(&stat->syncp); \ 2820 } \ 2821 } \ 2822 pcpu_stats; \ 2823 }) 2824 2825 enum netdev_lag_tx_type { 2826 NETDEV_LAG_TX_TYPE_UNKNOWN, 2827 NETDEV_LAG_TX_TYPE_RANDOM, 2828 NETDEV_LAG_TX_TYPE_BROADCAST, 2829 NETDEV_LAG_TX_TYPE_ROUNDROBIN, 2830 NETDEV_LAG_TX_TYPE_ACTIVEBACKUP, 2831 NETDEV_LAG_TX_TYPE_HASH, 2832 }; 2833 2834 enum netdev_lag_hash { 2835 NETDEV_LAG_HASH_NONE, 2836 NETDEV_LAG_HASH_L2, 2837 NETDEV_LAG_HASH_L34, 2838 NETDEV_LAG_HASH_L23, 2839 NETDEV_LAG_HASH_E23, 2840 NETDEV_LAG_HASH_E34, 2841 NETDEV_LAG_HASH_VLAN_SRCMAC, 2842 NETDEV_LAG_HASH_UNKNOWN, 2843 }; 2844 2845 struct netdev_lag_upper_info { 2846 enum netdev_lag_tx_type tx_type; 2847 enum netdev_lag_hash hash_type; 2848 }; 2849 2850 struct netdev_lag_lower_state_info { 2851 u8 link_up : 1, 2852 tx_enabled : 1; 2853 }; 2854 2855 #include <linux/notifier.h> 2856 2857 /* netdevice notifier chain. Please remember to update netdev_cmd_to_name() 2858 * and the rtnetlink notification exclusion list in rtnetlink_event() when 2859 * adding new types. 2860 */ 2861 enum netdev_cmd { 2862 NETDEV_UP = 1, /* For now you can't veto a device up/down */ 2863 NETDEV_DOWN, 2864 NETDEV_REBOOT, /* Tell a protocol stack a network interface 2865 detected a hardware crash and restarted 2866 - we can use this eg to kick tcp sessions 2867 once done */ 2868 NETDEV_CHANGE, /* Notify device state change */ 2869 NETDEV_REGISTER, 2870 NETDEV_UNREGISTER, 2871 NETDEV_CHANGEMTU, /* notify after mtu change happened */ 2872 NETDEV_CHANGEADDR, /* notify after the address change */ 2873 NETDEV_PRE_CHANGEADDR, /* notify before the address change */ 2874 NETDEV_GOING_DOWN, 2875 NETDEV_CHANGENAME, 2876 NETDEV_FEAT_CHANGE, 2877 NETDEV_BONDING_FAILOVER, 2878 NETDEV_PRE_UP, 2879 NETDEV_PRE_TYPE_CHANGE, 2880 NETDEV_POST_TYPE_CHANGE, 2881 NETDEV_POST_INIT, 2882 NETDEV_PRE_UNINIT, 2883 NETDEV_RELEASE, 2884 NETDEV_NOTIFY_PEERS, 2885 NETDEV_JOIN, 2886 NETDEV_CHANGEUPPER, 2887 NETDEV_RESEND_IGMP, 2888 NETDEV_PRECHANGEMTU, /* notify before mtu change happened */ 2889 NETDEV_CHANGEINFODATA, 2890 NETDEV_BONDING_INFO, 2891 NETDEV_PRECHANGEUPPER, 2892 NETDEV_CHANGELOWERSTATE, 2893 NETDEV_UDP_TUNNEL_PUSH_INFO, 2894 NETDEV_UDP_TUNNEL_DROP_INFO, 2895 NETDEV_CHANGE_TX_QUEUE_LEN, 2896 NETDEV_CVLAN_FILTER_PUSH_INFO, 2897 NETDEV_CVLAN_FILTER_DROP_INFO, 2898 NETDEV_SVLAN_FILTER_PUSH_INFO, 2899 NETDEV_SVLAN_FILTER_DROP_INFO, 2900 NETDEV_OFFLOAD_XSTATS_ENABLE, 2901 NETDEV_OFFLOAD_XSTATS_DISABLE, 2902 NETDEV_OFFLOAD_XSTATS_REPORT_USED, 2903 NETDEV_OFFLOAD_XSTATS_REPORT_DELTA, 2904 NETDEV_XDP_FEAT_CHANGE, 2905 }; 2906 const char *netdev_cmd_to_name(enum netdev_cmd cmd); 2907 2908 int register_netdevice_notifier(struct notifier_block *nb); 2909 int unregister_netdevice_notifier(struct notifier_block *nb); 2910 int register_netdevice_notifier_net(struct net *net, struct notifier_block *nb); 2911 int unregister_netdevice_notifier_net(struct net *net, 2912 struct notifier_block *nb); 2913 int register_netdevice_notifier_dev_net(struct net_device *dev, 2914 struct notifier_block *nb, 2915 struct netdev_net_notifier *nn); 2916 int unregister_netdevice_notifier_dev_net(struct net_device *dev, 2917 struct notifier_block *nb, 2918 struct netdev_net_notifier *nn); 2919 2920 struct netdev_notifier_info { 2921 struct net_device *dev; 2922 struct netlink_ext_ack *extack; 2923 }; 2924 2925 struct netdev_notifier_info_ext { 2926 struct netdev_notifier_info info; /* must be first */ 2927 union { 2928 u32 mtu; 2929 } ext; 2930 }; 2931 2932 struct netdev_notifier_change_info { 2933 struct netdev_notifier_info info; /* must be first */ 2934 unsigned int flags_changed; 2935 }; 2936 2937 struct netdev_notifier_changeupper_info { 2938 struct netdev_notifier_info info; /* must be first */ 2939 struct net_device *upper_dev; /* new upper dev */ 2940 bool master; /* is upper dev master */ 2941 bool linking; /* is the notification for link or unlink */ 2942 void *upper_info; /* upper dev info */ 2943 }; 2944 2945 struct netdev_notifier_changelowerstate_info { 2946 struct netdev_notifier_info info; /* must be first */ 2947 void *lower_state_info; /* is lower dev state */ 2948 }; 2949 2950 struct netdev_notifier_pre_changeaddr_info { 2951 struct netdev_notifier_info info; /* must be first */ 2952 const unsigned char *dev_addr; 2953 }; 2954 2955 enum netdev_offload_xstats_type { 2956 NETDEV_OFFLOAD_XSTATS_TYPE_L3 = 1, 2957 }; 2958 2959 struct netdev_notifier_offload_xstats_info { 2960 struct netdev_notifier_info info; /* must be first */ 2961 enum netdev_offload_xstats_type type; 2962 2963 union { 2964 /* NETDEV_OFFLOAD_XSTATS_REPORT_DELTA */ 2965 struct netdev_notifier_offload_xstats_rd *report_delta; 2966 /* NETDEV_OFFLOAD_XSTATS_REPORT_USED */ 2967 struct netdev_notifier_offload_xstats_ru *report_used; 2968 }; 2969 }; 2970 2971 int netdev_offload_xstats_enable(struct net_device *dev, 2972 enum netdev_offload_xstats_type type, 2973 struct netlink_ext_ack *extack); 2974 int netdev_offload_xstats_disable(struct net_device *dev, 2975 enum netdev_offload_xstats_type type); 2976 bool netdev_offload_xstats_enabled(const struct net_device *dev, 2977 enum netdev_offload_xstats_type type); 2978 int netdev_offload_xstats_get(struct net_device *dev, 2979 enum netdev_offload_xstats_type type, 2980 struct rtnl_hw_stats64 *stats, bool *used, 2981 struct netlink_ext_ack *extack); 2982 void 2983 netdev_offload_xstats_report_delta(struct netdev_notifier_offload_xstats_rd *rd, 2984 const struct rtnl_hw_stats64 *stats); 2985 void 2986 netdev_offload_xstats_report_used(struct netdev_notifier_offload_xstats_ru *ru); 2987 void netdev_offload_xstats_push_delta(struct net_device *dev, 2988 enum netdev_offload_xstats_type type, 2989 const struct rtnl_hw_stats64 *stats); 2990 2991 static inline void netdev_notifier_info_init(struct netdev_notifier_info *info, 2992 struct net_device *dev) 2993 { 2994 info->dev = dev; 2995 info->extack = NULL; 2996 } 2997 2998 static inline struct net_device * 2999 netdev_notifier_info_to_dev(const struct netdev_notifier_info *info) 3000 { 3001 return info->dev; 3002 } 3003 3004 static inline struct netlink_ext_ack * 3005 netdev_notifier_info_to_extack(const struct netdev_notifier_info *info) 3006 { 3007 return info->extack; 3008 } 3009 3010 int call_netdevice_notifiers(unsigned long val, struct net_device *dev); 3011 int call_netdevice_notifiers_info(unsigned long val, 3012 struct netdev_notifier_info *info); 3013 3014 extern rwlock_t dev_base_lock; /* Device list lock */ 3015 3016 #define for_each_netdev(net, d) \ 3017 list_for_each_entry(d, &(net)->dev_base_head, dev_list) 3018 #define for_each_netdev_reverse(net, d) \ 3019 list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list) 3020 #define for_each_netdev_rcu(net, d) \ 3021 list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list) 3022 #define for_each_netdev_safe(net, d, n) \ 3023 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list) 3024 #define for_each_netdev_continue(net, d) \ 3025 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list) 3026 #define for_each_netdev_continue_reverse(net, d) \ 3027 list_for_each_entry_continue_reverse(d, &(net)->dev_base_head, \ 3028 dev_list) 3029 #define for_each_netdev_continue_rcu(net, d) \ 3030 list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list) 3031 #define for_each_netdev_in_bond_rcu(bond, slave) \ 3032 for_each_netdev_rcu(&init_net, slave) \ 3033 if (netdev_master_upper_dev_get_rcu(slave) == (bond)) 3034 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) 3035 3036 #define for_each_netdev_dump(net, d, ifindex) \ 3037 xa_for_each_start(&(net)->dev_by_index, (ifindex), (d), (ifindex)) 3038 3039 static inline struct net_device *next_net_device(struct net_device *dev) 3040 { 3041 struct list_head *lh; 3042 struct net *net; 3043 3044 net = dev_net(dev); 3045 lh = dev->dev_list.next; 3046 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 3047 } 3048 3049 static inline struct net_device *next_net_device_rcu(struct net_device *dev) 3050 { 3051 struct list_head *lh; 3052 struct net *net; 3053 3054 net = dev_net(dev); 3055 lh = rcu_dereference(list_next_rcu(&dev->dev_list)); 3056 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 3057 } 3058 3059 static inline struct net_device *first_net_device(struct net *net) 3060 { 3061 return list_empty(&net->dev_base_head) ? NULL : 3062 net_device_entry(net->dev_base_head.next); 3063 } 3064 3065 static inline struct net_device *first_net_device_rcu(struct net *net) 3066 { 3067 struct list_head *lh = rcu_dereference(list_next_rcu(&net->dev_base_head)); 3068 3069 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 3070 } 3071 3072 int netdev_boot_setup_check(struct net_device *dev); 3073 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, 3074 const char *hwaddr); 3075 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type); 3076 void dev_add_pack(struct packet_type *pt); 3077 void dev_remove_pack(struct packet_type *pt); 3078 void __dev_remove_pack(struct packet_type *pt); 3079 void dev_add_offload(struct packet_offload *po); 3080 void dev_remove_offload(struct packet_offload *po); 3081 3082 int dev_get_iflink(const struct net_device *dev); 3083 int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb); 3084 int dev_fill_forward_path(const struct net_device *dev, const u8 *daddr, 3085 struct net_device_path_stack *stack); 3086 struct net_device *__dev_get_by_flags(struct net *net, unsigned short flags, 3087 unsigned short mask); 3088 struct net_device *dev_get_by_name(struct net *net, const char *name); 3089 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name); 3090 struct net_device *__dev_get_by_name(struct net *net, const char *name); 3091 bool netdev_name_in_use(struct net *net, const char *name); 3092 int dev_alloc_name(struct net_device *dev, const char *name); 3093 int dev_open(struct net_device *dev, struct netlink_ext_ack *extack); 3094 void dev_close(struct net_device *dev); 3095 void dev_close_many(struct list_head *head, bool unlink); 3096 void dev_disable_lro(struct net_device *dev); 3097 int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *newskb); 3098 u16 dev_pick_tx_zero(struct net_device *dev, struct sk_buff *skb, 3099 struct net_device *sb_dev); 3100 u16 dev_pick_tx_cpu_id(struct net_device *dev, struct sk_buff *skb, 3101 struct net_device *sb_dev); 3102 3103 int __dev_queue_xmit(struct sk_buff *skb, struct net_device *sb_dev); 3104 int __dev_direct_xmit(struct sk_buff *skb, u16 queue_id); 3105 3106 static inline int dev_queue_xmit(struct sk_buff *skb) 3107 { 3108 return __dev_queue_xmit(skb, NULL); 3109 } 3110 3111 static inline int dev_queue_xmit_accel(struct sk_buff *skb, 3112 struct net_device *sb_dev) 3113 { 3114 return __dev_queue_xmit(skb, sb_dev); 3115 } 3116 3117 static inline int dev_direct_xmit(struct sk_buff *skb, u16 queue_id) 3118 { 3119 int ret; 3120 3121 ret = __dev_direct_xmit(skb, queue_id); 3122 if (!dev_xmit_complete(ret)) 3123 kfree_skb(skb); 3124 return ret; 3125 } 3126 3127 int register_netdevice(struct net_device *dev); 3128 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head); 3129 void unregister_netdevice_many(struct list_head *head); 3130 static inline void unregister_netdevice(struct net_device *dev) 3131 { 3132 unregister_netdevice_queue(dev, NULL); 3133 } 3134 3135 int netdev_refcnt_read(const struct net_device *dev); 3136 void free_netdev(struct net_device *dev); 3137 void netdev_freemem(struct net_device *dev); 3138 int init_dummy_netdev(struct net_device *dev); 3139 3140 struct net_device *netdev_get_xmit_slave(struct net_device *dev, 3141 struct sk_buff *skb, 3142 bool all_slaves); 3143 struct net_device *netdev_sk_get_lowest_dev(struct net_device *dev, 3144 struct sock *sk); 3145 struct net_device *dev_get_by_index(struct net *net, int ifindex); 3146 struct net_device *__dev_get_by_index(struct net *net, int ifindex); 3147 struct net_device *netdev_get_by_index(struct net *net, int ifindex, 3148 netdevice_tracker *tracker, gfp_t gfp); 3149 struct net_device *netdev_get_by_name(struct net *net, const char *name, 3150 netdevice_tracker *tracker, gfp_t gfp); 3151 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex); 3152 struct net_device *dev_get_by_napi_id(unsigned int napi_id); 3153 3154 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, 3155 unsigned short type, 3156 const void *daddr, const void *saddr, 3157 unsigned int len) 3158 { 3159 if (!dev->header_ops || !dev->header_ops->create) 3160 return 0; 3161 3162 return dev->header_ops->create(skb, dev, type, daddr, saddr, len); 3163 } 3164 3165 static inline int dev_parse_header(const struct sk_buff *skb, 3166 unsigned char *haddr) 3167 { 3168 const struct net_device *dev = skb->dev; 3169 3170 if (!dev->header_ops || !dev->header_ops->parse) 3171 return 0; 3172 return dev->header_ops->parse(skb, haddr); 3173 } 3174 3175 static inline __be16 dev_parse_header_protocol(const struct sk_buff *skb) 3176 { 3177 const struct net_device *dev = skb->dev; 3178 3179 if (!dev->header_ops || !dev->header_ops->parse_protocol) 3180 return 0; 3181 return dev->header_ops->parse_protocol(skb); 3182 } 3183 3184 /* ll_header must have at least hard_header_len allocated */ 3185 static inline bool dev_validate_header(const struct net_device *dev, 3186 char *ll_header, int len) 3187 { 3188 if (likely(len >= dev->hard_header_len)) 3189 return true; 3190 if (len < dev->min_header_len) 3191 return false; 3192 3193 if (capable(CAP_SYS_RAWIO)) { 3194 memset(ll_header + len, 0, dev->hard_header_len - len); 3195 return true; 3196 } 3197 3198 if (dev->header_ops && dev->header_ops->validate) 3199 return dev->header_ops->validate(ll_header, len); 3200 3201 return false; 3202 } 3203 3204 static inline bool dev_has_header(const struct net_device *dev) 3205 { 3206 return dev->header_ops && dev->header_ops->create; 3207 } 3208 3209 /* 3210 * Incoming packets are placed on per-CPU queues 3211 */ 3212 struct softnet_data { 3213 struct list_head poll_list; 3214 struct sk_buff_head process_queue; 3215 3216 /* stats */ 3217 unsigned int processed; 3218 unsigned int time_squeeze; 3219 #ifdef CONFIG_RPS 3220 struct softnet_data *rps_ipi_list; 3221 #endif 3222 3223 bool in_net_rx_action; 3224 bool in_napi_threaded_poll; 3225 3226 #ifdef CONFIG_NET_FLOW_LIMIT 3227 struct sd_flow_limit __rcu *flow_limit; 3228 #endif 3229 struct Qdisc *output_queue; 3230 struct Qdisc **output_queue_tailp; 3231 struct sk_buff *completion_queue; 3232 #ifdef CONFIG_XFRM_OFFLOAD 3233 struct sk_buff_head xfrm_backlog; 3234 #endif 3235 /* written and read only by owning cpu: */ 3236 struct { 3237 u16 recursion; 3238 u8 more; 3239 #ifdef CONFIG_NET_EGRESS 3240 u8 skip_txqueue; 3241 #endif 3242 } xmit; 3243 #ifdef CONFIG_RPS 3244 /* input_queue_head should be written by cpu owning this struct, 3245 * and only read by other cpus. Worth using a cache line. 3246 */ 3247 unsigned int input_queue_head ____cacheline_aligned_in_smp; 3248 3249 /* Elements below can be accessed between CPUs for RPS/RFS */ 3250 call_single_data_t csd ____cacheline_aligned_in_smp; 3251 struct softnet_data *rps_ipi_next; 3252 unsigned int cpu; 3253 unsigned int input_queue_tail; 3254 #endif 3255 unsigned int received_rps; 3256 unsigned int dropped; 3257 struct sk_buff_head input_pkt_queue; 3258 struct napi_struct backlog; 3259 3260 /* Another possibly contended cache line */ 3261 spinlock_t defer_lock ____cacheline_aligned_in_smp; 3262 int defer_count; 3263 int defer_ipi_scheduled; 3264 struct sk_buff *defer_list; 3265 call_single_data_t defer_csd; 3266 }; 3267 3268 static inline void input_queue_head_incr(struct softnet_data *sd) 3269 { 3270 #ifdef CONFIG_RPS 3271 sd->input_queue_head++; 3272 #endif 3273 } 3274 3275 static inline void input_queue_tail_incr_save(struct softnet_data *sd, 3276 unsigned int *qtail) 3277 { 3278 #ifdef CONFIG_RPS 3279 *qtail = ++sd->input_queue_tail; 3280 #endif 3281 } 3282 3283 DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); 3284 3285 static inline int dev_recursion_level(void) 3286 { 3287 return this_cpu_read(softnet_data.xmit.recursion); 3288 } 3289 3290 #define XMIT_RECURSION_LIMIT 8 3291 static inline bool dev_xmit_recursion(void) 3292 { 3293 return unlikely(__this_cpu_read(softnet_data.xmit.recursion) > 3294 XMIT_RECURSION_LIMIT); 3295 } 3296 3297 static inline void dev_xmit_recursion_inc(void) 3298 { 3299 __this_cpu_inc(softnet_data.xmit.recursion); 3300 } 3301 3302 static inline void dev_xmit_recursion_dec(void) 3303 { 3304 __this_cpu_dec(softnet_data.xmit.recursion); 3305 } 3306 3307 void __netif_schedule(struct Qdisc *q); 3308 void netif_schedule_queue(struct netdev_queue *txq); 3309 3310 static inline void netif_tx_schedule_all(struct net_device *dev) 3311 { 3312 unsigned int i; 3313 3314 for (i = 0; i < dev->num_tx_queues; i++) 3315 netif_schedule_queue(netdev_get_tx_queue(dev, i)); 3316 } 3317 3318 static __always_inline void netif_tx_start_queue(struct netdev_queue *dev_queue) 3319 { 3320 clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state); 3321 } 3322 3323 /** 3324 * netif_start_queue - allow transmit 3325 * @dev: network device 3326 * 3327 * Allow upper layers to call the device hard_start_xmit routine. 3328 */ 3329 static inline void netif_start_queue(struct net_device *dev) 3330 { 3331 netif_tx_start_queue(netdev_get_tx_queue(dev, 0)); 3332 } 3333 3334 static inline void netif_tx_start_all_queues(struct net_device *dev) 3335 { 3336 unsigned int i; 3337 3338 for (i = 0; i < dev->num_tx_queues; i++) { 3339 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 3340 netif_tx_start_queue(txq); 3341 } 3342 } 3343 3344 void netif_tx_wake_queue(struct netdev_queue *dev_queue); 3345 3346 /** 3347 * netif_wake_queue - restart transmit 3348 * @dev: network device 3349 * 3350 * Allow upper layers to call the device hard_start_xmit routine. 3351 * Used for flow control when transmit resources are available. 3352 */ 3353 static inline void netif_wake_queue(struct net_device *dev) 3354 { 3355 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0)); 3356 } 3357 3358 static inline void netif_tx_wake_all_queues(struct net_device *dev) 3359 { 3360 unsigned int i; 3361 3362 for (i = 0; i < dev->num_tx_queues; i++) { 3363 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 3364 netif_tx_wake_queue(txq); 3365 } 3366 } 3367 3368 static __always_inline void netif_tx_stop_queue(struct netdev_queue *dev_queue) 3369 { 3370 /* Must be an atomic op see netif_txq_try_stop() */ 3371 set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state); 3372 } 3373 3374 /** 3375 * netif_stop_queue - stop transmitted packets 3376 * @dev: network device 3377 * 3378 * Stop upper layers calling the device hard_start_xmit routine. 3379 * Used for flow control when transmit resources are unavailable. 3380 */ 3381 static inline void netif_stop_queue(struct net_device *dev) 3382 { 3383 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0)); 3384 } 3385 3386 void netif_tx_stop_all_queues(struct net_device *dev); 3387 3388 static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue) 3389 { 3390 return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state); 3391 } 3392 3393 /** 3394 * netif_queue_stopped - test if transmit queue is flowblocked 3395 * @dev: network device 3396 * 3397 * Test if transmit queue on device is currently unable to send. 3398 */ 3399 static inline bool netif_queue_stopped(const struct net_device *dev) 3400 { 3401 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0)); 3402 } 3403 3404 static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue) 3405 { 3406 return dev_queue->state & QUEUE_STATE_ANY_XOFF; 3407 } 3408 3409 static inline bool 3410 netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue) 3411 { 3412 return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN; 3413 } 3414 3415 static inline bool 3416 netif_xmit_frozen_or_drv_stopped(const struct netdev_queue *dev_queue) 3417 { 3418 return dev_queue->state & QUEUE_STATE_DRV_XOFF_OR_FROZEN; 3419 } 3420 3421 /** 3422 * netdev_queue_set_dql_min_limit - set dql minimum limit 3423 * @dev_queue: pointer to transmit queue 3424 * @min_limit: dql minimum limit 3425 * 3426 * Forces xmit_more() to return true until the minimum threshold 3427 * defined by @min_limit is reached (or until the tx queue is 3428 * empty). Warning: to be use with care, misuse will impact the 3429 * latency. 3430 */ 3431 static inline void netdev_queue_set_dql_min_limit(struct netdev_queue *dev_queue, 3432 unsigned int min_limit) 3433 { 3434 #ifdef CONFIG_BQL 3435 dev_queue->dql.min_limit = min_limit; 3436 #endif 3437 } 3438 3439 /** 3440 * netdev_txq_bql_enqueue_prefetchw - prefetch bql data for write 3441 * @dev_queue: pointer to transmit queue 3442 * 3443 * BQL enabled drivers might use this helper in their ndo_start_xmit(), 3444 * to give appropriate hint to the CPU. 3445 */ 3446 static inline void netdev_txq_bql_enqueue_prefetchw(struct netdev_queue *dev_queue) 3447 { 3448 #ifdef CONFIG_BQL 3449 prefetchw(&dev_queue->dql.num_queued); 3450 #endif 3451 } 3452 3453 /** 3454 * netdev_txq_bql_complete_prefetchw - prefetch bql data for write 3455 * @dev_queue: pointer to transmit queue 3456 * 3457 * BQL enabled drivers might use this helper in their TX completion path, 3458 * to give appropriate hint to the CPU. 3459 */ 3460 static inline void netdev_txq_bql_complete_prefetchw(struct netdev_queue *dev_queue) 3461 { 3462 #ifdef CONFIG_BQL 3463 prefetchw(&dev_queue->dql.limit); 3464 #endif 3465 } 3466 3467 /** 3468 * netdev_tx_sent_queue - report the number of bytes queued to a given tx queue 3469 * @dev_queue: network device queue 3470 * @bytes: number of bytes queued to the device queue 3471 * 3472 * Report the number of bytes queued for sending/completion to the network 3473 * device hardware queue. @bytes should be a good approximation and should 3474 * exactly match netdev_completed_queue() @bytes. 3475 * This is typically called once per packet, from ndo_start_xmit(). 3476 */ 3477 static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue, 3478 unsigned int bytes) 3479 { 3480 #ifdef CONFIG_BQL 3481 dql_queued(&dev_queue->dql, bytes); 3482 3483 if (likely(dql_avail(&dev_queue->dql) >= 0)) 3484 return; 3485 3486 set_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state); 3487 3488 /* 3489 * The XOFF flag must be set before checking the dql_avail below, 3490 * because in netdev_tx_completed_queue we update the dql_completed 3491 * before checking the XOFF flag. 3492 */ 3493 smp_mb(); 3494 3495 /* check again in case another CPU has just made room avail */ 3496 if (unlikely(dql_avail(&dev_queue->dql) >= 0)) 3497 clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state); 3498 #endif 3499 } 3500 3501 /* Variant of netdev_tx_sent_queue() for drivers that are aware 3502 * that they should not test BQL status themselves. 3503 * We do want to change __QUEUE_STATE_STACK_XOFF only for the last 3504 * skb of a batch. 3505 * Returns true if the doorbell must be used to kick the NIC. 3506 */ 3507 static inline bool __netdev_tx_sent_queue(struct netdev_queue *dev_queue, 3508 unsigned int bytes, 3509 bool xmit_more) 3510 { 3511 if (xmit_more) { 3512 #ifdef CONFIG_BQL 3513 dql_queued(&dev_queue->dql, bytes); 3514 #endif 3515 return netif_tx_queue_stopped(dev_queue); 3516 } 3517 netdev_tx_sent_queue(dev_queue, bytes); 3518 return true; 3519 } 3520 3521 /** 3522 * netdev_sent_queue - report the number of bytes queued to hardware 3523 * @dev: network device 3524 * @bytes: number of bytes queued to the hardware device queue 3525 * 3526 * Report the number of bytes queued for sending/completion to the network 3527 * device hardware queue#0. @bytes should be a good approximation and should 3528 * exactly match netdev_completed_queue() @bytes. 3529 * This is typically called once per packet, from ndo_start_xmit(). 3530 */ 3531 static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes) 3532 { 3533 netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes); 3534 } 3535 3536 static inline bool __netdev_sent_queue(struct net_device *dev, 3537 unsigned int bytes, 3538 bool xmit_more) 3539 { 3540 return __netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes, 3541 xmit_more); 3542 } 3543 3544 /** 3545 * netdev_tx_completed_queue - report number of packets/bytes at TX completion. 3546 * @dev_queue: network device queue 3547 * @pkts: number of packets (currently ignored) 3548 * @bytes: number of bytes dequeued from the device queue 3549 * 3550 * Must be called at most once per TX completion round (and not per 3551 * individual packet), so that BQL can adjust its limits appropriately. 3552 */ 3553 static inline void netdev_tx_completed_queue(struct netdev_queue *dev_queue, 3554 unsigned int pkts, unsigned int bytes) 3555 { 3556 #ifdef CONFIG_BQL 3557 if (unlikely(!bytes)) 3558 return; 3559 3560 dql_completed(&dev_queue->dql, bytes); 3561 3562 /* 3563 * Without the memory barrier there is a small possiblity that 3564 * netdev_tx_sent_queue will miss the update and cause the queue to 3565 * be stopped forever 3566 */ 3567 smp_mb(); /* NOTE: netdev_txq_completed_mb() assumes this exists */ 3568 3569 if (unlikely(dql_avail(&dev_queue->dql) < 0)) 3570 return; 3571 3572 if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state)) 3573 netif_schedule_queue(dev_queue); 3574 #endif 3575 } 3576 3577 /** 3578 * netdev_completed_queue - report bytes and packets completed by device 3579 * @dev: network device 3580 * @pkts: actual number of packets sent over the medium 3581 * @bytes: actual number of bytes sent over the medium 3582 * 3583 * Report the number of bytes and packets transmitted by the network device 3584 * hardware queue over the physical medium, @bytes must exactly match the 3585 * @bytes amount passed to netdev_sent_queue() 3586 */ 3587 static inline void netdev_completed_queue(struct net_device *dev, 3588 unsigned int pkts, unsigned int bytes) 3589 { 3590 netdev_tx_completed_queue(netdev_get_tx_queue(dev, 0), pkts, bytes); 3591 } 3592 3593 static inline void netdev_tx_reset_queue(struct netdev_queue *q) 3594 { 3595 #ifdef CONFIG_BQL 3596 clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state); 3597 dql_reset(&q->dql); 3598 #endif 3599 } 3600 3601 /** 3602 * netdev_reset_queue - reset the packets and bytes count of a network device 3603 * @dev_queue: network device 3604 * 3605 * Reset the bytes and packet count of a network device and clear the 3606 * software flow control OFF bit for this network device 3607 */ 3608 static inline void netdev_reset_queue(struct net_device *dev_queue) 3609 { 3610 netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0)); 3611 } 3612 3613 /** 3614 * netdev_cap_txqueue - check if selected tx queue exceeds device queues 3615 * @dev: network device 3616 * @queue_index: given tx queue index 3617 * 3618 * Returns 0 if given tx queue index >= number of device tx queues, 3619 * otherwise returns the originally passed tx queue index. 3620 */ 3621 static inline u16 netdev_cap_txqueue(struct net_device *dev, u16 queue_index) 3622 { 3623 if (unlikely(queue_index >= dev->real_num_tx_queues)) { 3624 net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n", 3625 dev->name, queue_index, 3626 dev->real_num_tx_queues); 3627 return 0; 3628 } 3629 3630 return queue_index; 3631 } 3632 3633 /** 3634 * netif_running - test if up 3635 * @dev: network device 3636 * 3637 * Test if the device has been brought up. 3638 */ 3639 static inline bool netif_running(const struct net_device *dev) 3640 { 3641 return test_bit(__LINK_STATE_START, &dev->state); 3642 } 3643 3644 /* 3645 * Routines to manage the subqueues on a device. We only need start, 3646 * stop, and a check if it's stopped. All other device management is 3647 * done at the overall netdevice level. 3648 * Also test the device if we're multiqueue. 3649 */ 3650 3651 /** 3652 * netif_start_subqueue - allow sending packets on subqueue 3653 * @dev: network device 3654 * @queue_index: sub queue index 3655 * 3656 * Start individual transmit queue of a device with multiple transmit queues. 3657 */ 3658 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 3659 { 3660 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 3661 3662 netif_tx_start_queue(txq); 3663 } 3664 3665 /** 3666 * netif_stop_subqueue - stop sending packets on subqueue 3667 * @dev: network device 3668 * @queue_index: sub queue index 3669 * 3670 * Stop individual transmit queue of a device with multiple transmit queues. 3671 */ 3672 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 3673 { 3674 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 3675 netif_tx_stop_queue(txq); 3676 } 3677 3678 /** 3679 * __netif_subqueue_stopped - test status of subqueue 3680 * @dev: network device 3681 * @queue_index: sub queue index 3682 * 3683 * Check individual transmit queue of a device with multiple transmit queues. 3684 */ 3685 static inline bool __netif_subqueue_stopped(const struct net_device *dev, 3686 u16 queue_index) 3687 { 3688 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 3689 3690 return netif_tx_queue_stopped(txq); 3691 } 3692 3693 /** 3694 * netif_subqueue_stopped - test status of subqueue 3695 * @dev: network device 3696 * @skb: sub queue buffer pointer 3697 * 3698 * Check individual transmit queue of a device with multiple transmit queues. 3699 */ 3700 static inline bool netif_subqueue_stopped(const struct net_device *dev, 3701 struct sk_buff *skb) 3702 { 3703 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb)); 3704 } 3705 3706 /** 3707 * netif_wake_subqueue - allow sending packets on subqueue 3708 * @dev: network device 3709 * @queue_index: sub queue index 3710 * 3711 * Resume individual transmit queue of a device with multiple transmit queues. 3712 */ 3713 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 3714 { 3715 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 3716 3717 netif_tx_wake_queue(txq); 3718 } 3719 3720 #ifdef CONFIG_XPS 3721 int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask, 3722 u16 index); 3723 int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask, 3724 u16 index, enum xps_map_type type); 3725 3726 /** 3727 * netif_attr_test_mask - Test a CPU or Rx queue set in a mask 3728 * @j: CPU/Rx queue index 3729 * @mask: bitmask of all cpus/rx queues 3730 * @nr_bits: number of bits in the bitmask 3731 * 3732 * Test if a CPU or Rx queue index is set in a mask of all CPU/Rx queues. 3733 */ 3734 static inline bool netif_attr_test_mask(unsigned long j, 3735 const unsigned long *mask, 3736 unsigned int nr_bits) 3737 { 3738 cpu_max_bits_warn(j, nr_bits); 3739 return test_bit(j, mask); 3740 } 3741 3742 /** 3743 * netif_attr_test_online - Test for online CPU/Rx queue 3744 * @j: CPU/Rx queue index 3745 * @online_mask: bitmask for CPUs/Rx queues that are online 3746 * @nr_bits: number of bits in the bitmask 3747 * 3748 * Returns true if a CPU/Rx queue is online. 3749 */ 3750 static inline bool netif_attr_test_online(unsigned long j, 3751 const unsigned long *online_mask, 3752 unsigned int nr_bits) 3753 { 3754 cpu_max_bits_warn(j, nr_bits); 3755 3756 if (online_mask) 3757 return test_bit(j, online_mask); 3758 3759 return (j < nr_bits); 3760 } 3761 3762 /** 3763 * netif_attrmask_next - get the next CPU/Rx queue in a cpu/Rx queues mask 3764 * @n: CPU/Rx queue index 3765 * @srcp: the cpumask/Rx queue mask pointer 3766 * @nr_bits: number of bits in the bitmask 3767 * 3768 * Returns >= nr_bits if no further CPUs/Rx queues set. 3769 */ 3770 static inline unsigned int netif_attrmask_next(int n, const unsigned long *srcp, 3771 unsigned int nr_bits) 3772 { 3773 /* -1 is a legal arg here. */ 3774 if (n != -1) 3775 cpu_max_bits_warn(n, nr_bits); 3776 3777 if (srcp) 3778 return find_next_bit(srcp, nr_bits, n + 1); 3779 3780 return n + 1; 3781 } 3782 3783 /** 3784 * netif_attrmask_next_and - get the next CPU/Rx queue in \*src1p & \*src2p 3785 * @n: CPU/Rx queue index 3786 * @src1p: the first CPUs/Rx queues mask pointer 3787 * @src2p: the second CPUs/Rx queues mask pointer 3788 * @nr_bits: number of bits in the bitmask 3789 * 3790 * Returns >= nr_bits if no further CPUs/Rx queues set in both. 3791 */ 3792 static inline int netif_attrmask_next_and(int n, const unsigned long *src1p, 3793 const unsigned long *src2p, 3794 unsigned int nr_bits) 3795 { 3796 /* -1 is a legal arg here. */ 3797 if (n != -1) 3798 cpu_max_bits_warn(n, nr_bits); 3799 3800 if (src1p && src2p) 3801 return find_next_and_bit(src1p, src2p, nr_bits, n + 1); 3802 else if (src1p) 3803 return find_next_bit(src1p, nr_bits, n + 1); 3804 else if (src2p) 3805 return find_next_bit(src2p, nr_bits, n + 1); 3806 3807 return n + 1; 3808 } 3809 #else 3810 static inline int netif_set_xps_queue(struct net_device *dev, 3811 const struct cpumask *mask, 3812 u16 index) 3813 { 3814 return 0; 3815 } 3816 3817 static inline int __netif_set_xps_queue(struct net_device *dev, 3818 const unsigned long *mask, 3819 u16 index, enum xps_map_type type) 3820 { 3821 return 0; 3822 } 3823 #endif 3824 3825 /** 3826 * netif_is_multiqueue - test if device has multiple transmit queues 3827 * @dev: network device 3828 * 3829 * Check if device has multiple transmit queues 3830 */ 3831 static inline bool netif_is_multiqueue(const struct net_device *dev) 3832 { 3833 return dev->num_tx_queues > 1; 3834 } 3835 3836 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq); 3837 3838 #ifdef CONFIG_SYSFS 3839 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq); 3840 #else 3841 static inline int netif_set_real_num_rx_queues(struct net_device *dev, 3842 unsigned int rxqs) 3843 { 3844 dev->real_num_rx_queues = rxqs; 3845 return 0; 3846 } 3847 #endif 3848 int netif_set_real_num_queues(struct net_device *dev, 3849 unsigned int txq, unsigned int rxq); 3850 3851 int netif_get_num_default_rss_queues(void); 3852 3853 void dev_kfree_skb_irq_reason(struct sk_buff *skb, enum skb_drop_reason reason); 3854 void dev_kfree_skb_any_reason(struct sk_buff *skb, enum skb_drop_reason reason); 3855 3856 /* 3857 * It is not allowed to call kfree_skb() or consume_skb() from hardware 3858 * interrupt context or with hardware interrupts being disabled. 3859 * (in_hardirq() || irqs_disabled()) 3860 * 3861 * We provide four helpers that can be used in following contexts : 3862 * 3863 * dev_kfree_skb_irq(skb) when caller drops a packet from irq context, 3864 * replacing kfree_skb(skb) 3865 * 3866 * dev_consume_skb_irq(skb) when caller consumes a packet from irq context. 3867 * Typically used in place of consume_skb(skb) in TX completion path 3868 * 3869 * dev_kfree_skb_any(skb) when caller doesn't know its current irq context, 3870 * replacing kfree_skb(skb) 3871 * 3872 * dev_consume_skb_any(skb) when caller doesn't know its current irq context, 3873 * and consumed a packet. Used in place of consume_skb(skb) 3874 */ 3875 static inline void dev_kfree_skb_irq(struct sk_buff *skb) 3876 { 3877 dev_kfree_skb_irq_reason(skb, SKB_DROP_REASON_NOT_SPECIFIED); 3878 } 3879 3880 static inline void dev_consume_skb_irq(struct sk_buff *skb) 3881 { 3882 dev_kfree_skb_irq_reason(skb, SKB_CONSUMED); 3883 } 3884 3885 static inline void dev_kfree_skb_any(struct sk_buff *skb) 3886 { 3887 dev_kfree_skb_any_reason(skb, SKB_DROP_REASON_NOT_SPECIFIED); 3888 } 3889 3890 static inline void dev_consume_skb_any(struct sk_buff *skb) 3891 { 3892 dev_kfree_skb_any_reason(skb, SKB_CONSUMED); 3893 } 3894 3895 u32 bpf_prog_run_generic_xdp(struct sk_buff *skb, struct xdp_buff *xdp, 3896 struct bpf_prog *xdp_prog); 3897 void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog); 3898 int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb); 3899 int netif_rx(struct sk_buff *skb); 3900 int __netif_rx(struct sk_buff *skb); 3901 3902 int netif_receive_skb(struct sk_buff *skb); 3903 int netif_receive_skb_core(struct sk_buff *skb); 3904 void netif_receive_skb_list_internal(struct list_head *head); 3905 void netif_receive_skb_list(struct list_head *head); 3906 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb); 3907 void napi_gro_flush(struct napi_struct *napi, bool flush_old); 3908 struct sk_buff *napi_get_frags(struct napi_struct *napi); 3909 void napi_get_frags_check(struct napi_struct *napi); 3910 gro_result_t napi_gro_frags(struct napi_struct *napi); 3911 struct packet_offload *gro_find_receive_by_type(__be16 type); 3912 struct packet_offload *gro_find_complete_by_type(__be16 type); 3913 3914 static inline void napi_free_frags(struct napi_struct *napi) 3915 { 3916 kfree_skb(napi->skb); 3917 napi->skb = NULL; 3918 } 3919 3920 bool netdev_is_rx_handler_busy(struct net_device *dev); 3921 int netdev_rx_handler_register(struct net_device *dev, 3922 rx_handler_func_t *rx_handler, 3923 void *rx_handler_data); 3924 void netdev_rx_handler_unregister(struct net_device *dev); 3925 3926 bool dev_valid_name(const char *name); 3927 static inline bool is_socket_ioctl_cmd(unsigned int cmd) 3928 { 3929 return _IOC_TYPE(cmd) == SOCK_IOC_TYPE; 3930 } 3931 int get_user_ifreq(struct ifreq *ifr, void __user **ifrdata, void __user *arg); 3932 int put_user_ifreq(struct ifreq *ifr, void __user *arg); 3933 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, 3934 void __user *data, bool *need_copyout); 3935 int dev_ifconf(struct net *net, struct ifconf __user *ifc); 3936 int generic_hwtstamp_get_lower(struct net_device *dev, 3937 struct kernel_hwtstamp_config *kernel_cfg); 3938 int generic_hwtstamp_set_lower(struct net_device *dev, 3939 struct kernel_hwtstamp_config *kernel_cfg, 3940 struct netlink_ext_ack *extack); 3941 int dev_ethtool(struct net *net, struct ifreq *ifr, void __user *userdata); 3942 unsigned int dev_get_flags(const struct net_device *); 3943 int __dev_change_flags(struct net_device *dev, unsigned int flags, 3944 struct netlink_ext_ack *extack); 3945 int dev_change_flags(struct net_device *dev, unsigned int flags, 3946 struct netlink_ext_ack *extack); 3947 int dev_set_alias(struct net_device *, const char *, size_t); 3948 int dev_get_alias(const struct net_device *, char *, size_t); 3949 int __dev_change_net_namespace(struct net_device *dev, struct net *net, 3950 const char *pat, int new_ifindex); 3951 static inline 3952 int dev_change_net_namespace(struct net_device *dev, struct net *net, 3953 const char *pat) 3954 { 3955 return __dev_change_net_namespace(dev, net, pat, 0); 3956 } 3957 int __dev_set_mtu(struct net_device *, int); 3958 int dev_set_mtu(struct net_device *, int); 3959 int dev_pre_changeaddr_notify(struct net_device *dev, const char *addr, 3960 struct netlink_ext_ack *extack); 3961 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa, 3962 struct netlink_ext_ack *extack); 3963 int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa, 3964 struct netlink_ext_ack *extack); 3965 int dev_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name); 3966 int dev_get_port_parent_id(struct net_device *dev, 3967 struct netdev_phys_item_id *ppid, bool recurse); 3968 bool netdev_port_same_parent_id(struct net_device *a, struct net_device *b); 3969 void netdev_dpll_pin_set(struct net_device *dev, struct dpll_pin *dpll_pin); 3970 void netdev_dpll_pin_clear(struct net_device *dev); 3971 3972 static inline struct dpll_pin *netdev_dpll_pin(const struct net_device *dev) 3973 { 3974 #if IS_ENABLED(CONFIG_DPLL) 3975 return dev->dpll_pin; 3976 #else 3977 return NULL; 3978 #endif 3979 } 3980 3981 struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again); 3982 struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, 3983 struct netdev_queue *txq, int *ret); 3984 3985 int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog); 3986 u8 dev_xdp_prog_count(struct net_device *dev); 3987 u32 dev_xdp_prog_id(struct net_device *dev, enum bpf_xdp_mode mode); 3988 3989 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb); 3990 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb); 3991 int dev_forward_skb_nomtu(struct net_device *dev, struct sk_buff *skb); 3992 bool is_skb_forwardable(const struct net_device *dev, 3993 const struct sk_buff *skb); 3994 3995 static __always_inline bool __is_skb_forwardable(const struct net_device *dev, 3996 const struct sk_buff *skb, 3997 const bool check_mtu) 3998 { 3999 const u32 vlan_hdr_len = 4; /* VLAN_HLEN */ 4000 unsigned int len; 4001 4002 if (!(dev->flags & IFF_UP)) 4003 return false; 4004 4005 if (!check_mtu) 4006 return true; 4007 4008 len = dev->mtu + dev->hard_header_len + vlan_hdr_len; 4009 if (skb->len <= len) 4010 return true; 4011 4012 /* if TSO is enabled, we don't care about the length as the packet 4013 * could be forwarded without being segmented before 4014 */ 4015 if (skb_is_gso(skb)) 4016 return true; 4017 4018 return false; 4019 } 4020 4021 void netdev_core_stats_inc(struct net_device *dev, u32 offset); 4022 4023 #define DEV_CORE_STATS_INC(FIELD) \ 4024 static inline void dev_core_stats_##FIELD##_inc(struct net_device *dev) \ 4025 { \ 4026 netdev_core_stats_inc(dev, \ 4027 offsetof(struct net_device_core_stats, FIELD)); \ 4028 } 4029 DEV_CORE_STATS_INC(rx_dropped) 4030 DEV_CORE_STATS_INC(tx_dropped) 4031 DEV_CORE_STATS_INC(rx_nohandler) 4032 DEV_CORE_STATS_INC(rx_otherhost_dropped) 4033 #undef DEV_CORE_STATS_INC 4034 4035 static __always_inline int ____dev_forward_skb(struct net_device *dev, 4036 struct sk_buff *skb, 4037 const bool check_mtu) 4038 { 4039 if (skb_orphan_frags(skb, GFP_ATOMIC) || 4040 unlikely(!__is_skb_forwardable(dev, skb, check_mtu))) { 4041 dev_core_stats_rx_dropped_inc(dev); 4042 kfree_skb(skb); 4043 return NET_RX_DROP; 4044 } 4045 4046 skb_scrub_packet(skb, !net_eq(dev_net(dev), dev_net(skb->dev))); 4047 skb->priority = 0; 4048 return 0; 4049 } 4050 4051 bool dev_nit_active(struct net_device *dev); 4052 void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev); 4053 4054 static inline void __dev_put(struct net_device *dev) 4055 { 4056 if (dev) { 4057 #ifdef CONFIG_PCPU_DEV_REFCNT 4058 this_cpu_dec(*dev->pcpu_refcnt); 4059 #else 4060 refcount_dec(&dev->dev_refcnt); 4061 #endif 4062 } 4063 } 4064 4065 static inline void __dev_hold(struct net_device *dev) 4066 { 4067 if (dev) { 4068 #ifdef CONFIG_PCPU_DEV_REFCNT 4069 this_cpu_inc(*dev->pcpu_refcnt); 4070 #else 4071 refcount_inc(&dev->dev_refcnt); 4072 #endif 4073 } 4074 } 4075 4076 static inline void __netdev_tracker_alloc(struct net_device *dev, 4077 netdevice_tracker *tracker, 4078 gfp_t gfp) 4079 { 4080 #ifdef CONFIG_NET_DEV_REFCNT_TRACKER 4081 ref_tracker_alloc(&dev->refcnt_tracker, tracker, gfp); 4082 #endif 4083 } 4084 4085 /* netdev_tracker_alloc() can upgrade a prior untracked reference 4086 * taken by dev_get_by_name()/dev_get_by_index() to a tracked one. 4087 */ 4088 static inline void netdev_tracker_alloc(struct net_device *dev, 4089 netdevice_tracker *tracker, gfp_t gfp) 4090 { 4091 #ifdef CONFIG_NET_DEV_REFCNT_TRACKER 4092 refcount_dec(&dev->refcnt_tracker.no_tracker); 4093 __netdev_tracker_alloc(dev, tracker, gfp); 4094 #endif 4095 } 4096 4097 static inline void netdev_tracker_free(struct net_device *dev, 4098 netdevice_tracker *tracker) 4099 { 4100 #ifdef CONFIG_NET_DEV_REFCNT_TRACKER 4101 ref_tracker_free(&dev->refcnt_tracker, tracker); 4102 #endif 4103 } 4104 4105 static inline void netdev_hold(struct net_device *dev, 4106 netdevice_tracker *tracker, gfp_t gfp) 4107 { 4108 if (dev) { 4109 __dev_hold(dev); 4110 __netdev_tracker_alloc(dev, tracker, gfp); 4111 } 4112 } 4113 4114 static inline void netdev_put(struct net_device *dev, 4115 netdevice_tracker *tracker) 4116 { 4117 if (dev) { 4118 netdev_tracker_free(dev, tracker); 4119 __dev_put(dev); 4120 } 4121 } 4122 4123 /** 4124 * dev_hold - get reference to device 4125 * @dev: network device 4126 * 4127 * Hold reference to device to keep it from being freed. 4128 * Try using netdev_hold() instead. 4129 */ 4130 static inline void dev_hold(struct net_device *dev) 4131 { 4132 netdev_hold(dev, NULL, GFP_ATOMIC); 4133 } 4134 4135 /** 4136 * dev_put - release reference to device 4137 * @dev: network device 4138 * 4139 * Release reference to device to allow it to be freed. 4140 * Try using netdev_put() instead. 4141 */ 4142 static inline void dev_put(struct net_device *dev) 4143 { 4144 netdev_put(dev, NULL); 4145 } 4146 4147 static inline void netdev_ref_replace(struct net_device *odev, 4148 struct net_device *ndev, 4149 netdevice_tracker *tracker, 4150 gfp_t gfp) 4151 { 4152 if (odev) 4153 netdev_tracker_free(odev, tracker); 4154 4155 __dev_hold(ndev); 4156 __dev_put(odev); 4157 4158 if (ndev) 4159 __netdev_tracker_alloc(ndev, tracker, gfp); 4160 } 4161 4162 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 4163 * and _off may be called from IRQ context, but it is caller 4164 * who is responsible for serialization of these calls. 4165 * 4166 * The name carrier is inappropriate, these functions should really be 4167 * called netif_lowerlayer_*() because they represent the state of any 4168 * kind of lower layer not just hardware media. 4169 */ 4170 void linkwatch_fire_event(struct net_device *dev); 4171 4172 /** 4173 * netif_carrier_ok - test if carrier present 4174 * @dev: network device 4175 * 4176 * Check if carrier is present on device 4177 */ 4178 static inline bool netif_carrier_ok(const struct net_device *dev) 4179 { 4180 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 4181 } 4182 4183 unsigned long dev_trans_start(struct net_device *dev); 4184 4185 void __netdev_watchdog_up(struct net_device *dev); 4186 4187 void netif_carrier_on(struct net_device *dev); 4188 void netif_carrier_off(struct net_device *dev); 4189 void netif_carrier_event(struct net_device *dev); 4190 4191 /** 4192 * netif_dormant_on - mark device as dormant. 4193 * @dev: network device 4194 * 4195 * Mark device as dormant (as per RFC2863). 4196 * 4197 * The dormant state indicates that the relevant interface is not 4198 * actually in a condition to pass packets (i.e., it is not 'up') but is 4199 * in a "pending" state, waiting for some external event. For "on- 4200 * demand" interfaces, this new state identifies the situation where the 4201 * interface is waiting for events to place it in the up state. 4202 */ 4203 static inline void netif_dormant_on(struct net_device *dev) 4204 { 4205 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 4206 linkwatch_fire_event(dev); 4207 } 4208 4209 /** 4210 * netif_dormant_off - set device as not dormant. 4211 * @dev: network device 4212 * 4213 * Device is not in dormant state. 4214 */ 4215 static inline void netif_dormant_off(struct net_device *dev) 4216 { 4217 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 4218 linkwatch_fire_event(dev); 4219 } 4220 4221 /** 4222 * netif_dormant - test if device is dormant 4223 * @dev: network device 4224 * 4225 * Check if device is dormant. 4226 */ 4227 static inline bool netif_dormant(const struct net_device *dev) 4228 { 4229 return test_bit(__LINK_STATE_DORMANT, &dev->state); 4230 } 4231 4232 4233 /** 4234 * netif_testing_on - mark device as under test. 4235 * @dev: network device 4236 * 4237 * Mark device as under test (as per RFC2863). 4238 * 4239 * The testing state indicates that some test(s) must be performed on 4240 * the interface. After completion, of the test, the interface state 4241 * will change to up, dormant, or down, as appropriate. 4242 */ 4243 static inline void netif_testing_on(struct net_device *dev) 4244 { 4245 if (!test_and_set_bit(__LINK_STATE_TESTING, &dev->state)) 4246 linkwatch_fire_event(dev); 4247 } 4248 4249 /** 4250 * netif_testing_off - set device as not under test. 4251 * @dev: network device 4252 * 4253 * Device is not in testing state. 4254 */ 4255 static inline void netif_testing_off(struct net_device *dev) 4256 { 4257 if (test_and_clear_bit(__LINK_STATE_TESTING, &dev->state)) 4258 linkwatch_fire_event(dev); 4259 } 4260 4261 /** 4262 * netif_testing - test if device is under test 4263 * @dev: network device 4264 * 4265 * Check if device is under test 4266 */ 4267 static inline bool netif_testing(const struct net_device *dev) 4268 { 4269 return test_bit(__LINK_STATE_TESTING, &dev->state); 4270 } 4271 4272 4273 /** 4274 * netif_oper_up - test if device is operational 4275 * @dev: network device 4276 * 4277 * Check if carrier is operational 4278 */ 4279 static inline bool netif_oper_up(const struct net_device *dev) 4280 { 4281 return (dev->operstate == IF_OPER_UP || 4282 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 4283 } 4284 4285 /** 4286 * netif_device_present - is device available or removed 4287 * @dev: network device 4288 * 4289 * Check if device has not been removed from system. 4290 */ 4291 static inline bool netif_device_present(const struct net_device *dev) 4292 { 4293 return test_bit(__LINK_STATE_PRESENT, &dev->state); 4294 } 4295 4296 void netif_device_detach(struct net_device *dev); 4297 4298 void netif_device_attach(struct net_device *dev); 4299 4300 /* 4301 * Network interface message level settings 4302 */ 4303 4304 enum { 4305 NETIF_MSG_DRV_BIT, 4306 NETIF_MSG_PROBE_BIT, 4307 NETIF_MSG_LINK_BIT, 4308 NETIF_MSG_TIMER_BIT, 4309 NETIF_MSG_IFDOWN_BIT, 4310 NETIF_MSG_IFUP_BIT, 4311 NETIF_MSG_RX_ERR_BIT, 4312 NETIF_MSG_TX_ERR_BIT, 4313 NETIF_MSG_TX_QUEUED_BIT, 4314 NETIF_MSG_INTR_BIT, 4315 NETIF_MSG_TX_DONE_BIT, 4316 NETIF_MSG_RX_STATUS_BIT, 4317 NETIF_MSG_PKTDATA_BIT, 4318 NETIF_MSG_HW_BIT, 4319 NETIF_MSG_WOL_BIT, 4320 4321 /* When you add a new bit above, update netif_msg_class_names array 4322 * in net/ethtool/common.c 4323 */ 4324 NETIF_MSG_CLASS_COUNT, 4325 }; 4326 /* Both ethtool_ops interface and internal driver implementation use u32 */ 4327 static_assert(NETIF_MSG_CLASS_COUNT <= 32); 4328 4329 #define __NETIF_MSG_BIT(bit) ((u32)1 << (bit)) 4330 #define __NETIF_MSG(name) __NETIF_MSG_BIT(NETIF_MSG_ ## name ## _BIT) 4331 4332 #define NETIF_MSG_DRV __NETIF_MSG(DRV) 4333 #define NETIF_MSG_PROBE __NETIF_MSG(PROBE) 4334 #define NETIF_MSG_LINK __NETIF_MSG(LINK) 4335 #define NETIF_MSG_TIMER __NETIF_MSG(TIMER) 4336 #define NETIF_MSG_IFDOWN __NETIF_MSG(IFDOWN) 4337 #define NETIF_MSG_IFUP __NETIF_MSG(IFUP) 4338 #define NETIF_MSG_RX_ERR __NETIF_MSG(RX_ERR) 4339 #define NETIF_MSG_TX_ERR __NETIF_MSG(TX_ERR) 4340 #define NETIF_MSG_TX_QUEUED __NETIF_MSG(TX_QUEUED) 4341 #define NETIF_MSG_INTR __NETIF_MSG(INTR) 4342 #define NETIF_MSG_TX_DONE __NETIF_MSG(TX_DONE) 4343 #define NETIF_MSG_RX_STATUS __NETIF_MSG(RX_STATUS) 4344 #define NETIF_MSG_PKTDATA __NETIF_MSG(PKTDATA) 4345 #define NETIF_MSG_HW __NETIF_MSG(HW) 4346 #define NETIF_MSG_WOL __NETIF_MSG(WOL) 4347 4348 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 4349 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 4350 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 4351 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 4352 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 4353 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 4354 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 4355 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 4356 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 4357 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 4358 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 4359 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 4360 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 4361 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 4362 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 4363 4364 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 4365 { 4366 /* use default */ 4367 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 4368 return default_msg_enable_bits; 4369 if (debug_value == 0) /* no output */ 4370 return 0; 4371 /* set low N bits */ 4372 return (1U << debug_value) - 1; 4373 } 4374 4375 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu) 4376 { 4377 spin_lock(&txq->_xmit_lock); 4378 /* Pairs with READ_ONCE() in __dev_queue_xmit() */ 4379 WRITE_ONCE(txq->xmit_lock_owner, cpu); 4380 } 4381 4382 static inline bool __netif_tx_acquire(struct netdev_queue *txq) 4383 { 4384 __acquire(&txq->_xmit_lock); 4385 return true; 4386 } 4387 4388 static inline void __netif_tx_release(struct netdev_queue *txq) 4389 { 4390 __release(&txq->_xmit_lock); 4391 } 4392 4393 static inline void __netif_tx_lock_bh(struct netdev_queue *txq) 4394 { 4395 spin_lock_bh(&txq->_xmit_lock); 4396 /* Pairs with READ_ONCE() in __dev_queue_xmit() */ 4397 WRITE_ONCE(txq->xmit_lock_owner, smp_processor_id()); 4398 } 4399 4400 static inline bool __netif_tx_trylock(struct netdev_queue *txq) 4401 { 4402 bool ok = spin_trylock(&txq->_xmit_lock); 4403 4404 if (likely(ok)) { 4405 /* Pairs with READ_ONCE() in __dev_queue_xmit() */ 4406 WRITE_ONCE(txq->xmit_lock_owner, smp_processor_id()); 4407 } 4408 return ok; 4409 } 4410 4411 static inline void __netif_tx_unlock(struct netdev_queue *txq) 4412 { 4413 /* Pairs with READ_ONCE() in __dev_queue_xmit() */ 4414 WRITE_ONCE(txq->xmit_lock_owner, -1); 4415 spin_unlock(&txq->_xmit_lock); 4416 } 4417 4418 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq) 4419 { 4420 /* Pairs with READ_ONCE() in __dev_queue_xmit() */ 4421 WRITE_ONCE(txq->xmit_lock_owner, -1); 4422 spin_unlock_bh(&txq->_xmit_lock); 4423 } 4424 4425 /* 4426 * txq->trans_start can be read locklessly from dev_watchdog() 4427 */ 4428 static inline void txq_trans_update(struct netdev_queue *txq) 4429 { 4430 if (txq->xmit_lock_owner != -1) 4431 WRITE_ONCE(txq->trans_start, jiffies); 4432 } 4433 4434 static inline void txq_trans_cond_update(struct netdev_queue *txq) 4435 { 4436 unsigned long now = jiffies; 4437 4438 if (READ_ONCE(txq->trans_start) != now) 4439 WRITE_ONCE(txq->trans_start, now); 4440 } 4441 4442 /* legacy drivers only, netdev_start_xmit() sets txq->trans_start */ 4443 static inline void netif_trans_update(struct net_device *dev) 4444 { 4445 struct netdev_queue *txq = netdev_get_tx_queue(dev, 0); 4446 4447 txq_trans_cond_update(txq); 4448 } 4449 4450 /** 4451 * netif_tx_lock - grab network device transmit lock 4452 * @dev: network device 4453 * 4454 * Get network device transmit lock 4455 */ 4456 void netif_tx_lock(struct net_device *dev); 4457 4458 static inline void netif_tx_lock_bh(struct net_device *dev) 4459 { 4460 local_bh_disable(); 4461 netif_tx_lock(dev); 4462 } 4463 4464 void netif_tx_unlock(struct net_device *dev); 4465 4466 static inline void netif_tx_unlock_bh(struct net_device *dev) 4467 { 4468 netif_tx_unlock(dev); 4469 local_bh_enable(); 4470 } 4471 4472 #define HARD_TX_LOCK(dev, txq, cpu) { \ 4473 if ((dev->features & NETIF_F_LLTX) == 0) { \ 4474 __netif_tx_lock(txq, cpu); \ 4475 } else { \ 4476 __netif_tx_acquire(txq); \ 4477 } \ 4478 } 4479 4480 #define HARD_TX_TRYLOCK(dev, txq) \ 4481 (((dev->features & NETIF_F_LLTX) == 0) ? \ 4482 __netif_tx_trylock(txq) : \ 4483 __netif_tx_acquire(txq)) 4484 4485 #define HARD_TX_UNLOCK(dev, txq) { \ 4486 if ((dev->features & NETIF_F_LLTX) == 0) { \ 4487 __netif_tx_unlock(txq); \ 4488 } else { \ 4489 __netif_tx_release(txq); \ 4490 } \ 4491 } 4492 4493 static inline void netif_tx_disable(struct net_device *dev) 4494 { 4495 unsigned int i; 4496 int cpu; 4497 4498 local_bh_disable(); 4499 cpu = smp_processor_id(); 4500 spin_lock(&dev->tx_global_lock); 4501 for (i = 0; i < dev->num_tx_queues; i++) { 4502 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 4503 4504 __netif_tx_lock(txq, cpu); 4505 netif_tx_stop_queue(txq); 4506 __netif_tx_unlock(txq); 4507 } 4508 spin_unlock(&dev->tx_global_lock); 4509 local_bh_enable(); 4510 } 4511 4512 static inline void netif_addr_lock(struct net_device *dev) 4513 { 4514 unsigned char nest_level = 0; 4515 4516 #ifdef CONFIG_LOCKDEP 4517 nest_level = dev->nested_level; 4518 #endif 4519 spin_lock_nested(&dev->addr_list_lock, nest_level); 4520 } 4521 4522 static inline void netif_addr_lock_bh(struct net_device *dev) 4523 { 4524 unsigned char nest_level = 0; 4525 4526 #ifdef CONFIG_LOCKDEP 4527 nest_level = dev->nested_level; 4528 #endif 4529 local_bh_disable(); 4530 spin_lock_nested(&dev->addr_list_lock, nest_level); 4531 } 4532 4533 static inline void netif_addr_unlock(struct net_device *dev) 4534 { 4535 spin_unlock(&dev->addr_list_lock); 4536 } 4537 4538 static inline void netif_addr_unlock_bh(struct net_device *dev) 4539 { 4540 spin_unlock_bh(&dev->addr_list_lock); 4541 } 4542 4543 /* 4544 * dev_addrs walker. Should be used only for read access. Call with 4545 * rcu_read_lock held. 4546 */ 4547 #define for_each_dev_addr(dev, ha) \ 4548 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list) 4549 4550 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 4551 4552 void ether_setup(struct net_device *dev); 4553 4554 /* Support for loadable net-drivers */ 4555 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, 4556 unsigned char name_assign_type, 4557 void (*setup)(struct net_device *), 4558 unsigned int txqs, unsigned int rxqs); 4559 #define alloc_netdev(sizeof_priv, name, name_assign_type, setup) \ 4560 alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, 1, 1) 4561 4562 #define alloc_netdev_mq(sizeof_priv, name, name_assign_type, setup, count) \ 4563 alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, count, \ 4564 count) 4565 4566 int register_netdev(struct net_device *dev); 4567 void unregister_netdev(struct net_device *dev); 4568 4569 int devm_register_netdev(struct device *dev, struct net_device *ndev); 4570 4571 /* General hardware address lists handling functions */ 4572 int __hw_addr_sync(struct netdev_hw_addr_list *to_list, 4573 struct netdev_hw_addr_list *from_list, int addr_len); 4574 void __hw_addr_unsync(struct netdev_hw_addr_list *to_list, 4575 struct netdev_hw_addr_list *from_list, int addr_len); 4576 int __hw_addr_sync_dev(struct netdev_hw_addr_list *list, 4577 struct net_device *dev, 4578 int (*sync)(struct net_device *, const unsigned char *), 4579 int (*unsync)(struct net_device *, 4580 const unsigned char *)); 4581 int __hw_addr_ref_sync_dev(struct netdev_hw_addr_list *list, 4582 struct net_device *dev, 4583 int (*sync)(struct net_device *, 4584 const unsigned char *, int), 4585 int (*unsync)(struct net_device *, 4586 const unsigned char *, int)); 4587 void __hw_addr_ref_unsync_dev(struct netdev_hw_addr_list *list, 4588 struct net_device *dev, 4589 int (*unsync)(struct net_device *, 4590 const unsigned char *, int)); 4591 void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list, 4592 struct net_device *dev, 4593 int (*unsync)(struct net_device *, 4594 const unsigned char *)); 4595 void __hw_addr_init(struct netdev_hw_addr_list *list); 4596 4597 /* Functions used for device addresses handling */ 4598 void dev_addr_mod(struct net_device *dev, unsigned int offset, 4599 const void *addr, size_t len); 4600 4601 static inline void 4602 __dev_addr_set(struct net_device *dev, const void *addr, size_t len) 4603 { 4604 dev_addr_mod(dev, 0, addr, len); 4605 } 4606 4607 static inline void dev_addr_set(struct net_device *dev, const u8 *addr) 4608 { 4609 __dev_addr_set(dev, addr, dev->addr_len); 4610 } 4611 4612 int dev_addr_add(struct net_device *dev, const unsigned char *addr, 4613 unsigned char addr_type); 4614 int dev_addr_del(struct net_device *dev, const unsigned char *addr, 4615 unsigned char addr_type); 4616 4617 /* Functions used for unicast addresses handling */ 4618 int dev_uc_add(struct net_device *dev, const unsigned char *addr); 4619 int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr); 4620 int dev_uc_del(struct net_device *dev, const unsigned char *addr); 4621 int dev_uc_sync(struct net_device *to, struct net_device *from); 4622 int dev_uc_sync_multiple(struct net_device *to, struct net_device *from); 4623 void dev_uc_unsync(struct net_device *to, struct net_device *from); 4624 void dev_uc_flush(struct net_device *dev); 4625 void dev_uc_init(struct net_device *dev); 4626 4627 /** 4628 * __dev_uc_sync - Synchonize device's unicast list 4629 * @dev: device to sync 4630 * @sync: function to call if address should be added 4631 * @unsync: function to call if address should be removed 4632 * 4633 * Add newly added addresses to the interface, and release 4634 * addresses that have been deleted. 4635 */ 4636 static inline int __dev_uc_sync(struct net_device *dev, 4637 int (*sync)(struct net_device *, 4638 const unsigned char *), 4639 int (*unsync)(struct net_device *, 4640 const unsigned char *)) 4641 { 4642 return __hw_addr_sync_dev(&dev->uc, dev, sync, unsync); 4643 } 4644 4645 /** 4646 * __dev_uc_unsync - Remove synchronized addresses from device 4647 * @dev: device to sync 4648 * @unsync: function to call if address should be removed 4649 * 4650 * Remove all addresses that were added to the device by dev_uc_sync(). 4651 */ 4652 static inline void __dev_uc_unsync(struct net_device *dev, 4653 int (*unsync)(struct net_device *, 4654 const unsigned char *)) 4655 { 4656 __hw_addr_unsync_dev(&dev->uc, dev, unsync); 4657 } 4658 4659 /* Functions used for multicast addresses handling */ 4660 int dev_mc_add(struct net_device *dev, const unsigned char *addr); 4661 int dev_mc_add_global(struct net_device *dev, const unsigned char *addr); 4662 int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr); 4663 int dev_mc_del(struct net_device *dev, const unsigned char *addr); 4664 int dev_mc_del_global(struct net_device *dev, const unsigned char *addr); 4665 int dev_mc_sync(struct net_device *to, struct net_device *from); 4666 int dev_mc_sync_multiple(struct net_device *to, struct net_device *from); 4667 void dev_mc_unsync(struct net_device *to, struct net_device *from); 4668 void dev_mc_flush(struct net_device *dev); 4669 void dev_mc_init(struct net_device *dev); 4670 4671 /** 4672 * __dev_mc_sync - Synchonize device's multicast list 4673 * @dev: device to sync 4674 * @sync: function to call if address should be added 4675 * @unsync: function to call if address should be removed 4676 * 4677 * Add newly added addresses to the interface, and release 4678 * addresses that have been deleted. 4679 */ 4680 static inline int __dev_mc_sync(struct net_device *dev, 4681 int (*sync)(struct net_device *, 4682 const unsigned char *), 4683 int (*unsync)(struct net_device *, 4684 const unsigned char *)) 4685 { 4686 return __hw_addr_sync_dev(&dev->mc, dev, sync, unsync); 4687 } 4688 4689 /** 4690 * __dev_mc_unsync - Remove synchronized addresses from device 4691 * @dev: device to sync 4692 * @unsync: function to call if address should be removed 4693 * 4694 * Remove all addresses that were added to the device by dev_mc_sync(). 4695 */ 4696 static inline void __dev_mc_unsync(struct net_device *dev, 4697 int (*unsync)(struct net_device *, 4698 const unsigned char *)) 4699 { 4700 __hw_addr_unsync_dev(&dev->mc, dev, unsync); 4701 } 4702 4703 /* Functions used for secondary unicast and multicast support */ 4704 void dev_set_rx_mode(struct net_device *dev); 4705 int dev_set_promiscuity(struct net_device *dev, int inc); 4706 int dev_set_allmulti(struct net_device *dev, int inc); 4707 void netdev_state_change(struct net_device *dev); 4708 void __netdev_notify_peers(struct net_device *dev); 4709 void netdev_notify_peers(struct net_device *dev); 4710 void netdev_features_change(struct net_device *dev); 4711 /* Load a device via the kmod */ 4712 void dev_load(struct net *net, const char *name); 4713 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, 4714 struct rtnl_link_stats64 *storage); 4715 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, 4716 const struct net_device_stats *netdev_stats); 4717 void dev_fetch_sw_netstats(struct rtnl_link_stats64 *s, 4718 const struct pcpu_sw_netstats __percpu *netstats); 4719 void dev_get_tstats64(struct net_device *dev, struct rtnl_link_stats64 *s); 4720 4721 extern int netdev_max_backlog; 4722 extern int dev_rx_weight; 4723 extern int dev_tx_weight; 4724 extern int gro_normal_batch; 4725 4726 enum { 4727 NESTED_SYNC_IMM_BIT, 4728 NESTED_SYNC_TODO_BIT, 4729 }; 4730 4731 #define __NESTED_SYNC_BIT(bit) ((u32)1 << (bit)) 4732 #define __NESTED_SYNC(name) __NESTED_SYNC_BIT(NESTED_SYNC_ ## name ## _BIT) 4733 4734 #define NESTED_SYNC_IMM __NESTED_SYNC(IMM) 4735 #define NESTED_SYNC_TODO __NESTED_SYNC(TODO) 4736 4737 struct netdev_nested_priv { 4738 unsigned char flags; 4739 void *data; 4740 }; 4741 4742 bool netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev); 4743 struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, 4744 struct list_head **iter); 4745 4746 /* iterate through upper list, must be called under RCU read lock */ 4747 #define netdev_for_each_upper_dev_rcu(dev, updev, iter) \ 4748 for (iter = &(dev)->adj_list.upper, \ 4749 updev = netdev_upper_get_next_dev_rcu(dev, &(iter)); \ 4750 updev; \ 4751 updev = netdev_upper_get_next_dev_rcu(dev, &(iter))) 4752 4753 int netdev_walk_all_upper_dev_rcu(struct net_device *dev, 4754 int (*fn)(struct net_device *upper_dev, 4755 struct netdev_nested_priv *priv), 4756 struct netdev_nested_priv *priv); 4757 4758 bool netdev_has_upper_dev_all_rcu(struct net_device *dev, 4759 struct net_device *upper_dev); 4760 4761 bool netdev_has_any_upper_dev(struct net_device *dev); 4762 4763 void *netdev_lower_get_next_private(struct net_device *dev, 4764 struct list_head **iter); 4765 void *netdev_lower_get_next_private_rcu(struct net_device *dev, 4766 struct list_head **iter); 4767 4768 #define netdev_for_each_lower_private(dev, priv, iter) \ 4769 for (iter = (dev)->adj_list.lower.next, \ 4770 priv = netdev_lower_get_next_private(dev, &(iter)); \ 4771 priv; \ 4772 priv = netdev_lower_get_next_private(dev, &(iter))) 4773 4774 #define netdev_for_each_lower_private_rcu(dev, priv, iter) \ 4775 for (iter = &(dev)->adj_list.lower, \ 4776 priv = netdev_lower_get_next_private_rcu(dev, &(iter)); \ 4777 priv; \ 4778 priv = netdev_lower_get_next_private_rcu(dev, &(iter))) 4779 4780 void *netdev_lower_get_next(struct net_device *dev, 4781 struct list_head **iter); 4782 4783 #define netdev_for_each_lower_dev(dev, ldev, iter) \ 4784 for (iter = (dev)->adj_list.lower.next, \ 4785 ldev = netdev_lower_get_next(dev, &(iter)); \ 4786 ldev; \ 4787 ldev = netdev_lower_get_next(dev, &(iter))) 4788 4789 struct net_device *netdev_next_lower_dev_rcu(struct net_device *dev, 4790 struct list_head **iter); 4791 int netdev_walk_all_lower_dev(struct net_device *dev, 4792 int (*fn)(struct net_device *lower_dev, 4793 struct netdev_nested_priv *priv), 4794 struct netdev_nested_priv *priv); 4795 int netdev_walk_all_lower_dev_rcu(struct net_device *dev, 4796 int (*fn)(struct net_device *lower_dev, 4797 struct netdev_nested_priv *priv), 4798 struct netdev_nested_priv *priv); 4799 4800 void *netdev_adjacent_get_private(struct list_head *adj_list); 4801 void *netdev_lower_get_first_private_rcu(struct net_device *dev); 4802 struct net_device *netdev_master_upper_dev_get(struct net_device *dev); 4803 struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev); 4804 int netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev, 4805 struct netlink_ext_ack *extack); 4806 int netdev_master_upper_dev_link(struct net_device *dev, 4807 struct net_device *upper_dev, 4808 void *upper_priv, void *upper_info, 4809 struct netlink_ext_ack *extack); 4810 void netdev_upper_dev_unlink(struct net_device *dev, 4811 struct net_device *upper_dev); 4812 int netdev_adjacent_change_prepare(struct net_device *old_dev, 4813 struct net_device *new_dev, 4814 struct net_device *dev, 4815 struct netlink_ext_ack *extack); 4816 void netdev_adjacent_change_commit(struct net_device *old_dev, 4817 struct net_device *new_dev, 4818 struct net_device *dev); 4819 void netdev_adjacent_change_abort(struct net_device *old_dev, 4820 struct net_device *new_dev, 4821 struct net_device *dev); 4822 void netdev_adjacent_rename_links(struct net_device *dev, char *oldname); 4823 void *netdev_lower_dev_get_private(struct net_device *dev, 4824 struct net_device *lower_dev); 4825 void netdev_lower_state_changed(struct net_device *lower_dev, 4826 void *lower_state_info); 4827 4828 /* RSS keys are 40 or 52 bytes long */ 4829 #define NETDEV_RSS_KEY_LEN 52 4830 extern u8 netdev_rss_key[NETDEV_RSS_KEY_LEN] __read_mostly; 4831 void netdev_rss_key_fill(void *buffer, size_t len); 4832 4833 int skb_checksum_help(struct sk_buff *skb); 4834 int skb_crc32c_csum_help(struct sk_buff *skb); 4835 int skb_csum_hwoffload_help(struct sk_buff *skb, 4836 const netdev_features_t features); 4837 4838 struct netdev_bonding_info { 4839 ifslave slave; 4840 ifbond master; 4841 }; 4842 4843 struct netdev_notifier_bonding_info { 4844 struct netdev_notifier_info info; /* must be first */ 4845 struct netdev_bonding_info bonding_info; 4846 }; 4847 4848 void netdev_bonding_info_change(struct net_device *dev, 4849 struct netdev_bonding_info *bonding_info); 4850 4851 #if IS_ENABLED(CONFIG_ETHTOOL_NETLINK) 4852 void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data); 4853 #else 4854 static inline void ethtool_notify(struct net_device *dev, unsigned int cmd, 4855 const void *data) 4856 { 4857 } 4858 #endif 4859 4860 __be16 skb_network_protocol(struct sk_buff *skb, int *depth); 4861 4862 static inline bool can_checksum_protocol(netdev_features_t features, 4863 __be16 protocol) 4864 { 4865 if (protocol == htons(ETH_P_FCOE)) 4866 return !!(features & NETIF_F_FCOE_CRC); 4867 4868 /* Assume this is an IP checksum (not SCTP CRC) */ 4869 4870 if (features & NETIF_F_HW_CSUM) { 4871 /* Can checksum everything */ 4872 return true; 4873 } 4874 4875 switch (protocol) { 4876 case htons(ETH_P_IP): 4877 return !!(features & NETIF_F_IP_CSUM); 4878 case htons(ETH_P_IPV6): 4879 return !!(features & NETIF_F_IPV6_CSUM); 4880 default: 4881 return false; 4882 } 4883 } 4884 4885 #ifdef CONFIG_BUG 4886 void netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb); 4887 #else 4888 static inline void netdev_rx_csum_fault(struct net_device *dev, 4889 struct sk_buff *skb) 4890 { 4891 } 4892 #endif 4893 /* rx skb timestamps */ 4894 void net_enable_timestamp(void); 4895 void net_disable_timestamp(void); 4896 4897 static inline ktime_t netdev_get_tstamp(struct net_device *dev, 4898 const struct skb_shared_hwtstamps *hwtstamps, 4899 bool cycles) 4900 { 4901 const struct net_device_ops *ops = dev->netdev_ops; 4902 4903 if (ops->ndo_get_tstamp) 4904 return ops->ndo_get_tstamp(dev, hwtstamps, cycles); 4905 4906 return hwtstamps->hwtstamp; 4907 } 4908 4909 static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops, 4910 struct sk_buff *skb, struct net_device *dev, 4911 bool more) 4912 { 4913 __this_cpu_write(softnet_data.xmit.more, more); 4914 return ops->ndo_start_xmit(skb, dev); 4915 } 4916 4917 static inline bool netdev_xmit_more(void) 4918 { 4919 return __this_cpu_read(softnet_data.xmit.more); 4920 } 4921 4922 static inline netdev_tx_t netdev_start_xmit(struct sk_buff *skb, struct net_device *dev, 4923 struct netdev_queue *txq, bool more) 4924 { 4925 const struct net_device_ops *ops = dev->netdev_ops; 4926 netdev_tx_t rc; 4927 4928 rc = __netdev_start_xmit(ops, skb, dev, more); 4929 if (rc == NETDEV_TX_OK) 4930 txq_trans_update(txq); 4931 4932 return rc; 4933 } 4934 4935 int netdev_class_create_file_ns(const struct class_attribute *class_attr, 4936 const void *ns); 4937 void netdev_class_remove_file_ns(const struct class_attribute *class_attr, 4938 const void *ns); 4939 4940 extern const struct kobj_ns_type_operations net_ns_type_operations; 4941 4942 const char *netdev_drivername(const struct net_device *dev); 4943 4944 static inline netdev_features_t netdev_intersect_features(netdev_features_t f1, 4945 netdev_features_t f2) 4946 { 4947 if ((f1 ^ f2) & NETIF_F_HW_CSUM) { 4948 if (f1 & NETIF_F_HW_CSUM) 4949 f1 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); 4950 else 4951 f2 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); 4952 } 4953 4954 return f1 & f2; 4955 } 4956 4957 static inline netdev_features_t netdev_get_wanted_features( 4958 struct net_device *dev) 4959 { 4960 return (dev->features & ~dev->hw_features) | dev->wanted_features; 4961 } 4962 netdev_features_t netdev_increment_features(netdev_features_t all, 4963 netdev_features_t one, netdev_features_t mask); 4964 4965 /* Allow TSO being used on stacked device : 4966 * Performing the GSO segmentation before last device 4967 * is a performance improvement. 4968 */ 4969 static inline netdev_features_t netdev_add_tso_features(netdev_features_t features, 4970 netdev_features_t mask) 4971 { 4972 return netdev_increment_features(features, NETIF_F_ALL_TSO, mask); 4973 } 4974 4975 int __netdev_update_features(struct net_device *dev); 4976 void netdev_update_features(struct net_device *dev); 4977 void netdev_change_features(struct net_device *dev); 4978 4979 void netif_stacked_transfer_operstate(const struct net_device *rootdev, 4980 struct net_device *dev); 4981 4982 netdev_features_t passthru_features_check(struct sk_buff *skb, 4983 struct net_device *dev, 4984 netdev_features_t features); 4985 netdev_features_t netif_skb_features(struct sk_buff *skb); 4986 void skb_warn_bad_offload(const struct sk_buff *skb); 4987 4988 static inline bool net_gso_ok(netdev_features_t features, int gso_type) 4989 { 4990 netdev_features_t feature = (netdev_features_t)gso_type << NETIF_F_GSO_SHIFT; 4991 4992 /* check flags correspondence */ 4993 BUILD_BUG_ON(SKB_GSO_TCPV4 != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT)); 4994 BUILD_BUG_ON(SKB_GSO_DODGY != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT)); 4995 BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT)); 4996 BUILD_BUG_ON(SKB_GSO_TCP_FIXEDID != (NETIF_F_TSO_MANGLEID >> NETIF_F_GSO_SHIFT)); 4997 BUILD_BUG_ON(SKB_GSO_TCPV6 != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT)); 4998 BUILD_BUG_ON(SKB_GSO_FCOE != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT)); 4999 BUILD_BUG_ON(SKB_GSO_GRE != (NETIF_F_GSO_GRE >> NETIF_F_GSO_SHIFT)); 5000 BUILD_BUG_ON(SKB_GSO_GRE_CSUM != (NETIF_F_GSO_GRE_CSUM >> NETIF_F_GSO_SHIFT)); 5001 BUILD_BUG_ON(SKB_GSO_IPXIP4 != (NETIF_F_GSO_IPXIP4 >> NETIF_F_GSO_SHIFT)); 5002 BUILD_BUG_ON(SKB_GSO_IPXIP6 != (NETIF_F_GSO_IPXIP6 >> NETIF_F_GSO_SHIFT)); 5003 BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL != (NETIF_F_GSO_UDP_TUNNEL >> NETIF_F_GSO_SHIFT)); 5004 BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL_CSUM != (NETIF_F_GSO_UDP_TUNNEL_CSUM >> NETIF_F_GSO_SHIFT)); 5005 BUILD_BUG_ON(SKB_GSO_PARTIAL != (NETIF_F_GSO_PARTIAL >> NETIF_F_GSO_SHIFT)); 5006 BUILD_BUG_ON(SKB_GSO_TUNNEL_REMCSUM != (NETIF_F_GSO_TUNNEL_REMCSUM >> NETIF_F_GSO_SHIFT)); 5007 BUILD_BUG_ON(SKB_GSO_SCTP != (NETIF_F_GSO_SCTP >> NETIF_F_GSO_SHIFT)); 5008 BUILD_BUG_ON(SKB_GSO_ESP != (NETIF_F_GSO_ESP >> NETIF_F_GSO_SHIFT)); 5009 BUILD_BUG_ON(SKB_GSO_UDP != (NETIF_F_GSO_UDP >> NETIF_F_GSO_SHIFT)); 5010 BUILD_BUG_ON(SKB_GSO_UDP_L4 != (NETIF_F_GSO_UDP_L4 >> NETIF_F_GSO_SHIFT)); 5011 BUILD_BUG_ON(SKB_GSO_FRAGLIST != (NETIF_F_GSO_FRAGLIST >> NETIF_F_GSO_SHIFT)); 5012 5013 return (features & feature) == feature; 5014 } 5015 5016 static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features) 5017 { 5018 return net_gso_ok(features, skb_shinfo(skb)->gso_type) && 5019 (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST)); 5020 } 5021 5022 static inline bool netif_needs_gso(struct sk_buff *skb, 5023 netdev_features_t features) 5024 { 5025 return skb_is_gso(skb) && (!skb_gso_ok(skb, features) || 5026 unlikely((skb->ip_summed != CHECKSUM_PARTIAL) && 5027 (skb->ip_summed != CHECKSUM_UNNECESSARY))); 5028 } 5029 5030 void netif_set_tso_max_size(struct net_device *dev, unsigned int size); 5031 void netif_set_tso_max_segs(struct net_device *dev, unsigned int segs); 5032 void netif_inherit_tso_max(struct net_device *to, 5033 const struct net_device *from); 5034 5035 static inline bool netif_is_macsec(const struct net_device *dev) 5036 { 5037 return dev->priv_flags & IFF_MACSEC; 5038 } 5039 5040 static inline bool netif_is_macvlan(const struct net_device *dev) 5041 { 5042 return dev->priv_flags & IFF_MACVLAN; 5043 } 5044 5045 static inline bool netif_is_macvlan_port(const struct net_device *dev) 5046 { 5047 return dev->priv_flags & IFF_MACVLAN_PORT; 5048 } 5049 5050 static inline bool netif_is_bond_master(const struct net_device *dev) 5051 { 5052 return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING; 5053 } 5054 5055 static inline bool netif_is_bond_slave(const struct net_device *dev) 5056 { 5057 return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING; 5058 } 5059 5060 static inline bool netif_supports_nofcs(struct net_device *dev) 5061 { 5062 return dev->priv_flags & IFF_SUPP_NOFCS; 5063 } 5064 5065 static inline bool netif_has_l3_rx_handler(const struct net_device *dev) 5066 { 5067 return dev->priv_flags & IFF_L3MDEV_RX_HANDLER; 5068 } 5069 5070 static inline bool netif_is_l3_master(const struct net_device *dev) 5071 { 5072 return dev->priv_flags & IFF_L3MDEV_MASTER; 5073 } 5074 5075 static inline bool netif_is_l3_slave(const struct net_device *dev) 5076 { 5077 return dev->priv_flags & IFF_L3MDEV_SLAVE; 5078 } 5079 5080 static inline int dev_sdif(const struct net_device *dev) 5081 { 5082 #ifdef CONFIG_NET_L3_MASTER_DEV 5083 if (netif_is_l3_slave(dev)) 5084 return dev->ifindex; 5085 #endif 5086 return 0; 5087 } 5088 5089 static inline bool netif_is_bridge_master(const struct net_device *dev) 5090 { 5091 return dev->priv_flags & IFF_EBRIDGE; 5092 } 5093 5094 static inline bool netif_is_bridge_port(const struct net_device *dev) 5095 { 5096 return dev->priv_flags & IFF_BRIDGE_PORT; 5097 } 5098 5099 static inline bool netif_is_ovs_master(const struct net_device *dev) 5100 { 5101 return dev->priv_flags & IFF_OPENVSWITCH; 5102 } 5103 5104 static inline bool netif_is_ovs_port(const struct net_device *dev) 5105 { 5106 return dev->priv_flags & IFF_OVS_DATAPATH; 5107 } 5108 5109 static inline bool netif_is_any_bridge_master(const struct net_device *dev) 5110 { 5111 return netif_is_bridge_master(dev) || netif_is_ovs_master(dev); 5112 } 5113 5114 static inline bool netif_is_any_bridge_port(const struct net_device *dev) 5115 { 5116 return netif_is_bridge_port(dev) || netif_is_ovs_port(dev); 5117 } 5118 5119 static inline bool netif_is_team_master(const struct net_device *dev) 5120 { 5121 return dev->priv_flags & IFF_TEAM; 5122 } 5123 5124 static inline bool netif_is_team_port(const struct net_device *dev) 5125 { 5126 return dev->priv_flags & IFF_TEAM_PORT; 5127 } 5128 5129 static inline bool netif_is_lag_master(const struct net_device *dev) 5130 { 5131 return netif_is_bond_master(dev) || netif_is_team_master(dev); 5132 } 5133 5134 static inline bool netif_is_lag_port(const struct net_device *dev) 5135 { 5136 return netif_is_bond_slave(dev) || netif_is_team_port(dev); 5137 } 5138 5139 static inline bool netif_is_rxfh_configured(const struct net_device *dev) 5140 { 5141 return dev->priv_flags & IFF_RXFH_CONFIGURED; 5142 } 5143 5144 static inline bool netif_is_failover(const struct net_device *dev) 5145 { 5146 return dev->priv_flags & IFF_FAILOVER; 5147 } 5148 5149 static inline bool netif_is_failover_slave(const struct net_device *dev) 5150 { 5151 return dev->priv_flags & IFF_FAILOVER_SLAVE; 5152 } 5153 5154 /* This device needs to keep skb dst for qdisc enqueue or ndo_start_xmit() */ 5155 static inline void netif_keep_dst(struct net_device *dev) 5156 { 5157 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM); 5158 } 5159 5160 /* return true if dev can't cope with mtu frames that need vlan tag insertion */ 5161 static inline bool netif_reduces_vlan_mtu(struct net_device *dev) 5162 { 5163 /* TODO: reserve and use an additional IFF bit, if we get more users */ 5164 return netif_is_macsec(dev); 5165 } 5166 5167 extern struct pernet_operations __net_initdata loopback_net_ops; 5168 5169 /* Logging, debugging and troubleshooting/diagnostic helpers. */ 5170 5171 /* netdev_printk helpers, similar to dev_printk */ 5172 5173 static inline const char *netdev_name(const struct net_device *dev) 5174 { 5175 if (!dev->name[0] || strchr(dev->name, '%')) 5176 return "(unnamed net_device)"; 5177 return dev->name; 5178 } 5179 5180 static inline const char *netdev_reg_state(const struct net_device *dev) 5181 { 5182 switch (dev->reg_state) { 5183 case NETREG_UNINITIALIZED: return " (uninitialized)"; 5184 case NETREG_REGISTERED: return ""; 5185 case NETREG_UNREGISTERING: return " (unregistering)"; 5186 case NETREG_UNREGISTERED: return " (unregistered)"; 5187 case NETREG_RELEASED: return " (released)"; 5188 case NETREG_DUMMY: return " (dummy)"; 5189 } 5190 5191 WARN_ONCE(1, "%s: unknown reg_state %d\n", dev->name, dev->reg_state); 5192 return " (unknown)"; 5193 } 5194 5195 #define MODULE_ALIAS_NETDEV(device) \ 5196 MODULE_ALIAS("netdev-" device) 5197 5198 /* 5199 * netdev_WARN() acts like dev_printk(), but with the key difference 5200 * of using a WARN/WARN_ON to get the message out, including the 5201 * file/line information and a backtrace. 5202 */ 5203 #define netdev_WARN(dev, format, args...) \ 5204 WARN(1, "netdevice: %s%s: " format, netdev_name(dev), \ 5205 netdev_reg_state(dev), ##args) 5206 5207 #define netdev_WARN_ONCE(dev, format, args...) \ 5208 WARN_ONCE(1, "netdevice: %s%s: " format, netdev_name(dev), \ 5209 netdev_reg_state(dev), ##args) 5210 5211 /* 5212 * The list of packet types we will receive (as opposed to discard) 5213 * and the routines to invoke. 5214 * 5215 * Why 16. Because with 16 the only overlap we get on a hash of the 5216 * low nibble of the protocol value is RARP/SNAP/X.25. 5217 * 5218 * 0800 IP 5219 * 0001 802.3 5220 * 0002 AX.25 5221 * 0004 802.2 5222 * 8035 RARP 5223 * 0005 SNAP 5224 * 0805 X.25 5225 * 0806 ARP 5226 * 8137 IPX 5227 * 0009 Localtalk 5228 * 86DD IPv6 5229 */ 5230 #define PTYPE_HASH_SIZE (16) 5231 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1) 5232 5233 extern struct list_head ptype_all __read_mostly; 5234 extern struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; 5235 5236 extern struct net_device *blackhole_netdev; 5237 5238 /* Note: Avoid these macros in fast path, prefer per-cpu or per-queue counters. */ 5239 #define DEV_STATS_INC(DEV, FIELD) atomic_long_inc(&(DEV)->stats.__##FIELD) 5240 #define DEV_STATS_ADD(DEV, FIELD, VAL) \ 5241 atomic_long_add((VAL), &(DEV)->stats.__##FIELD) 5242 #define DEV_STATS_READ(DEV, FIELD) atomic_long_read(&(DEV)->stats.__##FIELD) 5243 5244 #endif /* _LINUX_NETDEVICE_H */ 5245