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 #include <net/xdp.h> 44 45 #include <linux/netdev_features.h> 46 #include <linux/neighbour.h> 47 #include <uapi/linux/netdevice.h> 48 #include <uapi/linux/if_bonding.h> 49 #include <uapi/linux/pkt_cls.h> 50 #include <linux/hashtable.h> 51 #include <linux/rbtree.h> 52 #include <net/net_trackers.h> 53 #include <net/net_debug.h> 54 55 struct netpoll_info; 56 struct device; 57 struct ethtool_ops; 58 struct phy_device; 59 struct dsa_port; 60 struct ip_tunnel_parm; 61 struct macsec_context; 62 struct macsec_ops; 63 struct netdev_name_node; 64 struct sd_flow_limit; 65 struct sfp_bus; 66 /* 802.11 specific */ 67 struct wireless_dev; 68 /* 802.15.4 specific */ 69 struct wpan_dev; 70 struct mpls_dev; 71 /* UDP Tunnel offloads */ 72 struct udp_tunnel_info; 73 struct udp_tunnel_nic_info; 74 struct udp_tunnel_nic; 75 struct bpf_prog; 76 struct xdp_buff; 77 78 void synchronize_net(void); 79 void netdev_set_default_ethtool_ops(struct net_device *dev, 80 const struct ethtool_ops *ops); 81 void netdev_sw_irq_coalesce_default_on(struct net_device *dev); 82 83 /* Backlog congestion levels */ 84 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */ 85 #define NET_RX_DROP 1 /* packet dropped */ 86 87 #define MAX_NEST_DEV 8 88 89 /* 90 * Transmit return codes: transmit return codes originate from three different 91 * namespaces: 92 * 93 * - qdisc return codes 94 * - driver transmit return codes 95 * - errno values 96 * 97 * Drivers are allowed to return any one of those in their hard_start_xmit() 98 * function. Real network devices commonly used with qdiscs should only return 99 * the driver transmit return codes though - when qdiscs are used, the actual 100 * transmission happens asynchronously, so the value is not propagated to 101 * higher layers. Virtual network devices transmit synchronously; in this case 102 * the driver transmit return codes are consumed by dev_queue_xmit(), and all 103 * others are propagated to higher layers. 104 */ 105 106 /* qdisc ->enqueue() return codes. */ 107 #define NET_XMIT_SUCCESS 0x00 108 #define NET_XMIT_DROP 0x01 /* skb dropped */ 109 #define NET_XMIT_CN 0x02 /* congestion notification */ 110 #define NET_XMIT_MASK 0x0f /* qdisc flags in net/sch_generic.h */ 111 112 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It 113 * indicates that the device will soon be dropping packets, or already drops 114 * some packets of the same priority; prompting us to send less aggressively. */ 115 #define net_xmit_eval(e) ((e) == NET_XMIT_CN ? 0 : (e)) 116 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0) 117 118 /* Driver transmit return codes */ 119 #define NETDEV_TX_MASK 0xf0 120 121 enum netdev_tx { 122 __NETDEV_TX_MIN = INT_MIN, /* make sure enum is signed */ 123 NETDEV_TX_OK = 0x00, /* driver took care of packet */ 124 NETDEV_TX_BUSY = 0x10, /* driver tx path was busy*/ 125 }; 126 typedef enum netdev_tx netdev_tx_t; 127 128 /* 129 * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant; 130 * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed. 131 */ 132 static inline bool dev_xmit_complete(int rc) 133 { 134 /* 135 * Positive cases with an skb consumed by a driver: 136 * - successful transmission (rc == NETDEV_TX_OK) 137 * - error while transmitting (rc < 0) 138 * - error while queueing to a different device (rc & NET_XMIT_MASK) 139 */ 140 if (likely(rc < NET_XMIT_MASK)) 141 return true; 142 143 return false; 144 } 145 146 /* 147 * Compute the worst-case header length according to the protocols 148 * used. 149 */ 150 151 #if defined(CONFIG_HYPERV_NET) 152 # define LL_MAX_HEADER 128 153 #elif defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25) 154 # if defined(CONFIG_MAC80211_MESH) 155 # define LL_MAX_HEADER 128 156 # else 157 # define LL_MAX_HEADER 96 158 # endif 159 #else 160 # define LL_MAX_HEADER 32 161 #endif 162 163 #if !IS_ENABLED(CONFIG_NET_IPIP) && !IS_ENABLED(CONFIG_NET_IPGRE) && \ 164 !IS_ENABLED(CONFIG_IPV6_SIT) && !IS_ENABLED(CONFIG_IPV6_TUNNEL) 165 #define MAX_HEADER LL_MAX_HEADER 166 #else 167 #define MAX_HEADER (LL_MAX_HEADER + 48) 168 #endif 169 170 /* 171 * Old network device statistics. Fields are native words 172 * (unsigned long) so they can be read and written atomically. 173 */ 174 175 #define NET_DEV_STAT(FIELD) \ 176 union { \ 177 unsigned long FIELD; \ 178 atomic_long_t __##FIELD; \ 179 } 180 181 struct net_device_stats { 182 NET_DEV_STAT(rx_packets); 183 NET_DEV_STAT(tx_packets); 184 NET_DEV_STAT(rx_bytes); 185 NET_DEV_STAT(tx_bytes); 186 NET_DEV_STAT(rx_errors); 187 NET_DEV_STAT(tx_errors); 188 NET_DEV_STAT(rx_dropped); 189 NET_DEV_STAT(tx_dropped); 190 NET_DEV_STAT(multicast); 191 NET_DEV_STAT(collisions); 192 NET_DEV_STAT(rx_length_errors); 193 NET_DEV_STAT(rx_over_errors); 194 NET_DEV_STAT(rx_crc_errors); 195 NET_DEV_STAT(rx_frame_errors); 196 NET_DEV_STAT(rx_fifo_errors); 197 NET_DEV_STAT(rx_missed_errors); 198 NET_DEV_STAT(tx_aborted_errors); 199 NET_DEV_STAT(tx_carrier_errors); 200 NET_DEV_STAT(tx_fifo_errors); 201 NET_DEV_STAT(tx_heartbeat_errors); 202 NET_DEV_STAT(tx_window_errors); 203 NET_DEV_STAT(rx_compressed); 204 NET_DEV_STAT(tx_compressed); 205 }; 206 #undef NET_DEV_STAT 207 208 /* per-cpu stats, allocated on demand. 209 * Try to fit them in a single cache line, for dev_get_stats() sake. 210 */ 211 struct net_device_core_stats { 212 unsigned long rx_dropped; 213 unsigned long tx_dropped; 214 unsigned long rx_nohandler; 215 unsigned long rx_otherhost_dropped; 216 } __aligned(4 * sizeof(unsigned long)); 217 218 #include <linux/cache.h> 219 #include <linux/skbuff.h> 220 221 #ifdef CONFIG_RPS 222 #include <linux/static_key.h> 223 extern struct static_key_false rps_needed; 224 extern struct static_key_false rfs_needed; 225 #endif 226 227 struct neighbour; 228 struct neigh_parms; 229 struct sk_buff; 230 231 struct netdev_hw_addr { 232 struct list_head list; 233 struct rb_node node; 234 unsigned char addr[MAX_ADDR_LEN]; 235 unsigned char type; 236 #define NETDEV_HW_ADDR_T_LAN 1 237 #define NETDEV_HW_ADDR_T_SAN 2 238 #define NETDEV_HW_ADDR_T_UNICAST 3 239 #define NETDEV_HW_ADDR_T_MULTICAST 4 240 bool global_use; 241 int sync_cnt; 242 int refcount; 243 int synced; 244 struct rcu_head rcu_head; 245 }; 246 247 struct netdev_hw_addr_list { 248 struct list_head list; 249 int count; 250 251 /* Auxiliary tree for faster lookup on addition and deletion */ 252 struct rb_root tree; 253 }; 254 255 #define netdev_hw_addr_list_count(l) ((l)->count) 256 #define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0) 257 #define netdev_hw_addr_list_for_each(ha, l) \ 258 list_for_each_entry(ha, &(l)->list, list) 259 260 #define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc) 261 #define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc) 262 #define netdev_for_each_uc_addr(ha, dev) \ 263 netdev_hw_addr_list_for_each(ha, &(dev)->uc) 264 #define netdev_for_each_synced_uc_addr(_ha, _dev) \ 265 netdev_for_each_uc_addr((_ha), (_dev)) \ 266 if ((_ha)->sync_cnt) 267 268 #define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc) 269 #define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc) 270 #define netdev_for_each_mc_addr(ha, dev) \ 271 netdev_hw_addr_list_for_each(ha, &(dev)->mc) 272 #define netdev_for_each_synced_mc_addr(_ha, _dev) \ 273 netdev_for_each_mc_addr((_ha), (_dev)) \ 274 if ((_ha)->sync_cnt) 275 276 struct hh_cache { 277 unsigned int hh_len; 278 seqlock_t hh_lock; 279 280 /* cached hardware header; allow for machine alignment needs. */ 281 #define HH_DATA_MOD 16 282 #define HH_DATA_OFF(__len) \ 283 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) 284 #define HH_DATA_ALIGN(__len) \ 285 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) 286 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; 287 }; 288 289 /* Reserve HH_DATA_MOD byte-aligned hard_header_len, but at least that much. 290 * Alternative is: 291 * dev->hard_header_len ? (dev->hard_header_len + 292 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 293 * 294 * We could use other alignment values, but we must maintain the 295 * relationship HH alignment <= LL alignment. 296 */ 297 #define LL_RESERVED_SPACE(dev) \ 298 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 299 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 300 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 301 302 struct header_ops { 303 int (*create) (struct sk_buff *skb, struct net_device *dev, 304 unsigned short type, const void *daddr, 305 const void *saddr, unsigned int len); 306 int (*parse)(const struct sk_buff *skb, unsigned char *haddr); 307 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh, __be16 type); 308 void (*cache_update)(struct hh_cache *hh, 309 const struct net_device *dev, 310 const unsigned char *haddr); 311 bool (*validate)(const char *ll_header, unsigned int len); 312 __be16 (*parse_protocol)(const struct sk_buff *skb); 313 }; 314 315 /* These flag bits are private to the generic network queueing 316 * layer; they may not be explicitly referenced by any other 317 * code. 318 */ 319 320 enum netdev_state_t { 321 __LINK_STATE_START, 322 __LINK_STATE_PRESENT, 323 __LINK_STATE_NOCARRIER, 324 __LINK_STATE_LINKWATCH_PENDING, 325 __LINK_STATE_DORMANT, 326 __LINK_STATE_TESTING, 327 }; 328 329 struct gro_list { 330 struct list_head list; 331 int count; 332 }; 333 334 /* 335 * size of gro hash buckets, must less than bit number of 336 * napi_struct::gro_bitmask 337 */ 338 #define GRO_HASH_BUCKETS 8 339 340 /* 341 * Structure for NAPI scheduling similar to tasklet but with weighting 342 */ 343 struct napi_struct { 344 /* The poll_list must only be managed by the entity which 345 * changes the state of the NAPI_STATE_SCHED bit. This means 346 * whoever atomically sets that bit can add this napi_struct 347 * to the per-CPU poll_list, and whoever clears that bit 348 * can remove from the list right before clearing the bit. 349 */ 350 struct list_head poll_list; 351 352 unsigned long state; 353 int weight; 354 int defer_hard_irqs_count; 355 unsigned long gro_bitmask; 356 int (*poll)(struct napi_struct *, int); 357 #ifdef CONFIG_NETPOLL 358 int poll_owner; 359 #endif 360 struct net_device *dev; 361 struct gro_list gro_hash[GRO_HASH_BUCKETS]; 362 struct sk_buff *skb; 363 struct list_head rx_list; /* Pending GRO_NORMAL skbs */ 364 int rx_count; /* length of rx_list */ 365 struct hrtimer timer; 366 struct list_head dev_list; 367 struct hlist_node napi_hash_node; 368 unsigned int napi_id; 369 struct task_struct *thread; 370 }; 371 372 enum { 373 NAPI_STATE_SCHED, /* Poll is scheduled */ 374 NAPI_STATE_MISSED, /* reschedule a napi */ 375 NAPI_STATE_DISABLE, /* Disable pending */ 376 NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */ 377 NAPI_STATE_LISTED, /* NAPI added to system lists */ 378 NAPI_STATE_NO_BUSY_POLL, /* Do not add in napi_hash, no busy polling */ 379 NAPI_STATE_IN_BUSY_POLL, /* sk_busy_loop() owns this NAPI */ 380 NAPI_STATE_PREFER_BUSY_POLL, /* prefer busy-polling over softirq processing*/ 381 NAPI_STATE_THREADED, /* The poll is performed inside its own thread*/ 382 NAPI_STATE_SCHED_THREADED, /* Napi is currently scheduled in threaded mode */ 383 }; 384 385 enum { 386 NAPIF_STATE_SCHED = BIT(NAPI_STATE_SCHED), 387 NAPIF_STATE_MISSED = BIT(NAPI_STATE_MISSED), 388 NAPIF_STATE_DISABLE = BIT(NAPI_STATE_DISABLE), 389 NAPIF_STATE_NPSVC = BIT(NAPI_STATE_NPSVC), 390 NAPIF_STATE_LISTED = BIT(NAPI_STATE_LISTED), 391 NAPIF_STATE_NO_BUSY_POLL = BIT(NAPI_STATE_NO_BUSY_POLL), 392 NAPIF_STATE_IN_BUSY_POLL = BIT(NAPI_STATE_IN_BUSY_POLL), 393 NAPIF_STATE_PREFER_BUSY_POLL = BIT(NAPI_STATE_PREFER_BUSY_POLL), 394 NAPIF_STATE_THREADED = BIT(NAPI_STATE_THREADED), 395 NAPIF_STATE_SCHED_THREADED = BIT(NAPI_STATE_SCHED_THREADED), 396 }; 397 398 enum gro_result { 399 GRO_MERGED, 400 GRO_MERGED_FREE, 401 GRO_HELD, 402 GRO_NORMAL, 403 GRO_CONSUMED, 404 }; 405 typedef enum gro_result gro_result_t; 406 407 /* 408 * enum rx_handler_result - Possible return values for rx_handlers. 409 * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it 410 * further. 411 * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in 412 * case skb->dev was changed by rx_handler. 413 * @RX_HANDLER_EXACT: Force exact delivery, no wildcard. 414 * @RX_HANDLER_PASS: Do nothing, pass the skb as if no rx_handler was called. 415 * 416 * rx_handlers are functions called from inside __netif_receive_skb(), to do 417 * special processing of the skb, prior to delivery to protocol handlers. 418 * 419 * Currently, a net_device can only have a single rx_handler registered. Trying 420 * to register a second rx_handler will return -EBUSY. 421 * 422 * To register a rx_handler on a net_device, use netdev_rx_handler_register(). 423 * To unregister a rx_handler on a net_device, use 424 * netdev_rx_handler_unregister(). 425 * 426 * Upon return, rx_handler is expected to tell __netif_receive_skb() what to 427 * do with the skb. 428 * 429 * If the rx_handler consumed the skb in some way, it should return 430 * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for 431 * the skb to be delivered in some other way. 432 * 433 * If the rx_handler changed skb->dev, to divert the skb to another 434 * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the 435 * new device will be called if it exists. 436 * 437 * If the rx_handler decides the skb should be ignored, it should return 438 * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that 439 * are registered on exact device (ptype->dev == skb->dev). 440 * 441 * If the rx_handler didn't change skb->dev, but wants the skb to be normally 442 * delivered, it should return RX_HANDLER_PASS. 443 * 444 * A device without a registered rx_handler will behave as if rx_handler 445 * returned RX_HANDLER_PASS. 446 */ 447 448 enum rx_handler_result { 449 RX_HANDLER_CONSUMED, 450 RX_HANDLER_ANOTHER, 451 RX_HANDLER_EXACT, 452 RX_HANDLER_PASS, 453 }; 454 typedef enum rx_handler_result rx_handler_result_t; 455 typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb); 456 457 void __napi_schedule(struct napi_struct *n); 458 void __napi_schedule_irqoff(struct napi_struct *n); 459 460 static inline bool napi_disable_pending(struct napi_struct *n) 461 { 462 return test_bit(NAPI_STATE_DISABLE, &n->state); 463 } 464 465 static inline bool napi_prefer_busy_poll(struct napi_struct *n) 466 { 467 return test_bit(NAPI_STATE_PREFER_BUSY_POLL, &n->state); 468 } 469 470 bool napi_schedule_prep(struct napi_struct *n); 471 472 /** 473 * napi_schedule - schedule NAPI poll 474 * @n: NAPI context 475 * 476 * Schedule NAPI poll routine to be called if it is not already 477 * running. 478 */ 479 static inline void napi_schedule(struct napi_struct *n) 480 { 481 if (napi_schedule_prep(n)) 482 __napi_schedule(n); 483 } 484 485 /** 486 * napi_schedule_irqoff - schedule NAPI poll 487 * @n: NAPI context 488 * 489 * Variant of napi_schedule(), assuming hard irqs are masked. 490 */ 491 static inline void napi_schedule_irqoff(struct napi_struct *n) 492 { 493 if (napi_schedule_prep(n)) 494 __napi_schedule_irqoff(n); 495 } 496 497 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */ 498 static inline bool napi_reschedule(struct napi_struct *napi) 499 { 500 if (napi_schedule_prep(napi)) { 501 __napi_schedule(napi); 502 return true; 503 } 504 return false; 505 } 506 507 bool napi_complete_done(struct napi_struct *n, int work_done); 508 /** 509 * napi_complete - NAPI processing complete 510 * @n: NAPI context 511 * 512 * Mark NAPI processing as complete. 513 * Consider using napi_complete_done() instead. 514 * Return false if device should avoid rearming interrupts. 515 */ 516 static inline bool napi_complete(struct napi_struct *n) 517 { 518 return napi_complete_done(n, 0); 519 } 520 521 int dev_set_threaded(struct net_device *dev, bool threaded); 522 523 /** 524 * napi_disable - prevent NAPI from scheduling 525 * @n: NAPI context 526 * 527 * Stop NAPI from being scheduled on this context. 528 * Waits till any outstanding processing completes. 529 */ 530 void napi_disable(struct napi_struct *n); 531 532 void napi_enable(struct napi_struct *n); 533 534 /** 535 * napi_synchronize - wait until NAPI is not running 536 * @n: NAPI context 537 * 538 * Wait until NAPI is done being scheduled on this context. 539 * Waits till any outstanding processing completes but 540 * does not disable future activations. 541 */ 542 static inline void napi_synchronize(const struct napi_struct *n) 543 { 544 if (IS_ENABLED(CONFIG_SMP)) 545 while (test_bit(NAPI_STATE_SCHED, &n->state)) 546 msleep(1); 547 else 548 barrier(); 549 } 550 551 /** 552 * napi_if_scheduled_mark_missed - if napi is running, set the 553 * NAPIF_STATE_MISSED 554 * @n: NAPI context 555 * 556 * If napi is running, set the NAPIF_STATE_MISSED, and return true if 557 * NAPI is scheduled. 558 **/ 559 static inline bool napi_if_scheduled_mark_missed(struct napi_struct *n) 560 { 561 unsigned long val, new; 562 563 val = READ_ONCE(n->state); 564 do { 565 if (val & NAPIF_STATE_DISABLE) 566 return true; 567 568 if (!(val & NAPIF_STATE_SCHED)) 569 return false; 570 571 new = val | NAPIF_STATE_MISSED; 572 } while (!try_cmpxchg(&n->state, &val, new)); 573 574 return true; 575 } 576 577 enum netdev_queue_state_t { 578 __QUEUE_STATE_DRV_XOFF, 579 __QUEUE_STATE_STACK_XOFF, 580 __QUEUE_STATE_FROZEN, 581 }; 582 583 #define QUEUE_STATE_DRV_XOFF (1 << __QUEUE_STATE_DRV_XOFF) 584 #define QUEUE_STATE_STACK_XOFF (1 << __QUEUE_STATE_STACK_XOFF) 585 #define QUEUE_STATE_FROZEN (1 << __QUEUE_STATE_FROZEN) 586 587 #define QUEUE_STATE_ANY_XOFF (QUEUE_STATE_DRV_XOFF | QUEUE_STATE_STACK_XOFF) 588 #define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF | \ 589 QUEUE_STATE_FROZEN) 590 #define QUEUE_STATE_DRV_XOFF_OR_FROZEN (QUEUE_STATE_DRV_XOFF | \ 591 QUEUE_STATE_FROZEN) 592 593 /* 594 * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue. The 595 * netif_tx_* functions below are used to manipulate this flag. The 596 * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit 597 * queue independently. The netif_xmit_*stopped functions below are called 598 * to check if the queue has been stopped by the driver or stack (either 599 * of the XOFF bits are set in the state). Drivers should not need to call 600 * netif_xmit*stopped functions, they should only be using netif_tx_*. 601 */ 602 603 struct netdev_queue { 604 /* 605 * read-mostly part 606 */ 607 struct net_device *dev; 608 netdevice_tracker dev_tracker; 609 610 struct Qdisc __rcu *qdisc; 611 struct Qdisc *qdisc_sleeping; 612 #ifdef CONFIG_SYSFS 613 struct kobject kobj; 614 #endif 615 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA) 616 int numa_node; 617 #endif 618 unsigned long tx_maxrate; 619 /* 620 * Number of TX timeouts for this queue 621 * (/sys/class/net/DEV/Q/trans_timeout) 622 */ 623 atomic_long_t trans_timeout; 624 625 /* Subordinate device that the queue has been assigned to */ 626 struct net_device *sb_dev; 627 #ifdef CONFIG_XDP_SOCKETS 628 struct xsk_buff_pool *pool; 629 #endif 630 /* 631 * write-mostly part 632 */ 633 spinlock_t _xmit_lock ____cacheline_aligned_in_smp; 634 int xmit_lock_owner; 635 /* 636 * Time (in jiffies) of last Tx 637 */ 638 unsigned long trans_start; 639 640 unsigned long state; 641 642 #ifdef CONFIG_BQL 643 struct dql dql; 644 #endif 645 } ____cacheline_aligned_in_smp; 646 647 extern int sysctl_fb_tunnels_only_for_init_net; 648 extern int sysctl_devconf_inherit_init_net; 649 650 /* 651 * sysctl_fb_tunnels_only_for_init_net == 0 : For all netns 652 * == 1 : For initns only 653 * == 2 : For none. 654 */ 655 static inline bool net_has_fallback_tunnels(const struct net *net) 656 { 657 #if IS_ENABLED(CONFIG_SYSCTL) 658 int fb_tunnels_only_for_init_net = READ_ONCE(sysctl_fb_tunnels_only_for_init_net); 659 660 return !fb_tunnels_only_for_init_net || 661 (net_eq(net, &init_net) && fb_tunnels_only_for_init_net == 1); 662 #else 663 return true; 664 #endif 665 } 666 667 static inline int net_inherit_devconf(void) 668 { 669 #if IS_ENABLED(CONFIG_SYSCTL) 670 return READ_ONCE(sysctl_devconf_inherit_init_net); 671 #else 672 return 0; 673 #endif 674 } 675 676 static inline int netdev_queue_numa_node_read(const struct netdev_queue *q) 677 { 678 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA) 679 return q->numa_node; 680 #else 681 return NUMA_NO_NODE; 682 #endif 683 } 684 685 static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node) 686 { 687 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA) 688 q->numa_node = node; 689 #endif 690 } 691 692 #ifdef CONFIG_RPS 693 /* 694 * This structure holds an RPS map which can be of variable length. The 695 * map is an array of CPUs. 696 */ 697 struct rps_map { 698 unsigned int len; 699 struct rcu_head rcu; 700 u16 cpus[]; 701 }; 702 #define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16))) 703 704 /* 705 * The rps_dev_flow structure contains the mapping of a flow to a CPU, the 706 * tail pointer for that CPU's input queue at the time of last enqueue, and 707 * a hardware filter index. 708 */ 709 struct rps_dev_flow { 710 u16 cpu; 711 u16 filter; 712 unsigned int last_qtail; 713 }; 714 #define RPS_NO_FILTER 0xffff 715 716 /* 717 * The rps_dev_flow_table structure contains a table of flow mappings. 718 */ 719 struct rps_dev_flow_table { 720 unsigned int mask; 721 struct rcu_head rcu; 722 struct rps_dev_flow flows[]; 723 }; 724 #define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \ 725 ((_num) * sizeof(struct rps_dev_flow))) 726 727 /* 728 * The rps_sock_flow_table contains mappings of flows to the last CPU 729 * on which they were processed by the application (set in recvmsg). 730 * Each entry is a 32bit value. Upper part is the high-order bits 731 * of flow hash, lower part is CPU number. 732 * rps_cpu_mask is used to partition the space, depending on number of 733 * possible CPUs : rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1 734 * For example, if 64 CPUs are possible, rps_cpu_mask = 0x3f, 735 * meaning we use 32-6=26 bits for the hash. 736 */ 737 struct rps_sock_flow_table { 738 u32 mask; 739 740 u32 ents[] ____cacheline_aligned_in_smp; 741 }; 742 #define RPS_SOCK_FLOW_TABLE_SIZE(_num) (offsetof(struct rps_sock_flow_table, ents[_num])) 743 744 #define RPS_NO_CPU 0xffff 745 746 extern u32 rps_cpu_mask; 747 extern struct rps_sock_flow_table __rcu *rps_sock_flow_table; 748 749 static inline void rps_record_sock_flow(struct rps_sock_flow_table *table, 750 u32 hash) 751 { 752 if (table && hash) { 753 unsigned int index = hash & table->mask; 754 u32 val = hash & ~rps_cpu_mask; 755 756 /* We only give a hint, preemption can change CPU under us */ 757 val |= raw_smp_processor_id(); 758 759 if (table->ents[index] != val) 760 table->ents[index] = val; 761 } 762 } 763 764 #ifdef CONFIG_RFS_ACCEL 765 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id, 766 u16 filter_id); 767 #endif 768 #endif /* CONFIG_RPS */ 769 770 /* This structure contains an instance of an RX queue. */ 771 struct netdev_rx_queue { 772 struct xdp_rxq_info xdp_rxq; 773 #ifdef CONFIG_RPS 774 struct rps_map __rcu *rps_map; 775 struct rps_dev_flow_table __rcu *rps_flow_table; 776 #endif 777 struct kobject kobj; 778 struct net_device *dev; 779 netdevice_tracker dev_tracker; 780 781 #ifdef CONFIG_XDP_SOCKETS 782 struct xsk_buff_pool *pool; 783 #endif 784 } ____cacheline_aligned_in_smp; 785 786 /* 787 * RX queue sysfs structures and functions. 788 */ 789 struct rx_queue_attribute { 790 struct attribute attr; 791 ssize_t (*show)(struct netdev_rx_queue *queue, char *buf); 792 ssize_t (*store)(struct netdev_rx_queue *queue, 793 const char *buf, size_t len); 794 }; 795 796 /* XPS map type and offset of the xps map within net_device->xps_maps[]. */ 797 enum xps_map_type { 798 XPS_CPUS = 0, 799 XPS_RXQS, 800 XPS_MAPS_MAX, 801 }; 802 803 #ifdef CONFIG_XPS 804 /* 805 * This structure holds an XPS map which can be of variable length. The 806 * map is an array of queues. 807 */ 808 struct xps_map { 809 unsigned int len; 810 unsigned int alloc_len; 811 struct rcu_head rcu; 812 u16 queues[]; 813 }; 814 #define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16))) 815 #define XPS_MIN_MAP_ALLOC ((L1_CACHE_ALIGN(offsetof(struct xps_map, queues[1])) \ 816 - sizeof(struct xps_map)) / sizeof(u16)) 817 818 /* 819 * This structure holds all XPS maps for device. Maps are indexed by CPU. 820 * 821 * We keep track of the number of cpus/rxqs used when the struct is allocated, 822 * in nr_ids. This will help not accessing out-of-bound memory. 823 * 824 * We keep track of the number of traffic classes used when the struct is 825 * allocated, in num_tc. This will be used to navigate the maps, to ensure we're 826 * not crossing its upper bound, as the original dev->num_tc can be updated in 827 * the meantime. 828 */ 829 struct xps_dev_maps { 830 struct rcu_head rcu; 831 unsigned int nr_ids; 832 s16 num_tc; 833 struct xps_map __rcu *attr_map[]; /* Either CPUs map or RXQs map */ 834 }; 835 836 #define XPS_CPU_DEV_MAPS_SIZE(_tcs) (sizeof(struct xps_dev_maps) + \ 837 (nr_cpu_ids * (_tcs) * sizeof(struct xps_map *))) 838 839 #define XPS_RXQ_DEV_MAPS_SIZE(_tcs, _rxqs) (sizeof(struct xps_dev_maps) +\ 840 (_rxqs * (_tcs) * sizeof(struct xps_map *))) 841 842 #endif /* CONFIG_XPS */ 843 844 #define TC_MAX_QUEUE 16 845 #define TC_BITMASK 15 846 /* HW offloaded queuing disciplines txq count and offset maps */ 847 struct netdev_tc_txq { 848 u16 count; 849 u16 offset; 850 }; 851 852 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 853 /* 854 * This structure is to hold information about the device 855 * configured to run FCoE protocol stack. 856 */ 857 struct netdev_fcoe_hbainfo { 858 char manufacturer[64]; 859 char serial_number[64]; 860 char hardware_version[64]; 861 char driver_version[64]; 862 char optionrom_version[64]; 863 char firmware_version[64]; 864 char model[256]; 865 char model_description[256]; 866 }; 867 #endif 868 869 #define MAX_PHYS_ITEM_ID_LEN 32 870 871 /* This structure holds a unique identifier to identify some 872 * physical item (port for example) used by a netdevice. 873 */ 874 struct netdev_phys_item_id { 875 unsigned char id[MAX_PHYS_ITEM_ID_LEN]; 876 unsigned char id_len; 877 }; 878 879 static inline bool netdev_phys_item_id_same(struct netdev_phys_item_id *a, 880 struct netdev_phys_item_id *b) 881 { 882 return a->id_len == b->id_len && 883 memcmp(a->id, b->id, a->id_len) == 0; 884 } 885 886 typedef u16 (*select_queue_fallback_t)(struct net_device *dev, 887 struct sk_buff *skb, 888 struct net_device *sb_dev); 889 890 enum net_device_path_type { 891 DEV_PATH_ETHERNET = 0, 892 DEV_PATH_VLAN, 893 DEV_PATH_BRIDGE, 894 DEV_PATH_PPPOE, 895 DEV_PATH_DSA, 896 DEV_PATH_MTK_WDMA, 897 }; 898 899 struct net_device_path { 900 enum net_device_path_type type; 901 const struct net_device *dev; 902 union { 903 struct { 904 u16 id; 905 __be16 proto; 906 u8 h_dest[ETH_ALEN]; 907 } encap; 908 struct { 909 enum { 910 DEV_PATH_BR_VLAN_KEEP, 911 DEV_PATH_BR_VLAN_TAG, 912 DEV_PATH_BR_VLAN_UNTAG, 913 DEV_PATH_BR_VLAN_UNTAG_HW, 914 } vlan_mode; 915 u16 vlan_id; 916 __be16 vlan_proto; 917 } bridge; 918 struct { 919 int port; 920 u16 proto; 921 } dsa; 922 struct { 923 u8 wdma_idx; 924 u8 queue; 925 u16 wcid; 926 u8 bss; 927 } mtk_wdma; 928 }; 929 }; 930 931 #define NET_DEVICE_PATH_STACK_MAX 5 932 #define NET_DEVICE_PATH_VLAN_MAX 2 933 934 struct net_device_path_stack { 935 int num_paths; 936 struct net_device_path path[NET_DEVICE_PATH_STACK_MAX]; 937 }; 938 939 struct net_device_path_ctx { 940 const struct net_device *dev; 941 u8 daddr[ETH_ALEN]; 942 943 int num_vlans; 944 struct { 945 u16 id; 946 __be16 proto; 947 } vlan[NET_DEVICE_PATH_VLAN_MAX]; 948 }; 949 950 enum tc_setup_type { 951 TC_QUERY_CAPS, 952 TC_SETUP_QDISC_MQPRIO, 953 TC_SETUP_CLSU32, 954 TC_SETUP_CLSFLOWER, 955 TC_SETUP_CLSMATCHALL, 956 TC_SETUP_CLSBPF, 957 TC_SETUP_BLOCK, 958 TC_SETUP_QDISC_CBS, 959 TC_SETUP_QDISC_RED, 960 TC_SETUP_QDISC_PRIO, 961 TC_SETUP_QDISC_MQ, 962 TC_SETUP_QDISC_ETF, 963 TC_SETUP_ROOT_QDISC, 964 TC_SETUP_QDISC_GRED, 965 TC_SETUP_QDISC_TAPRIO, 966 TC_SETUP_FT, 967 TC_SETUP_QDISC_ETS, 968 TC_SETUP_QDISC_TBF, 969 TC_SETUP_QDISC_FIFO, 970 TC_SETUP_QDISC_HTB, 971 TC_SETUP_ACT, 972 }; 973 974 /* These structures hold the attributes of bpf state that are being passed 975 * to the netdevice through the bpf op. 976 */ 977 enum bpf_netdev_command { 978 /* Set or clear a bpf program used in the earliest stages of packet 979 * rx. The prog will have been loaded as BPF_PROG_TYPE_XDP. The callee 980 * is responsible for calling bpf_prog_put on any old progs that are 981 * stored. In case of error, the callee need not release the new prog 982 * reference, but on success it takes ownership and must bpf_prog_put 983 * when it is no longer used. 984 */ 985 XDP_SETUP_PROG, 986 XDP_SETUP_PROG_HW, 987 /* BPF program for offload callbacks, invoked at program load time. */ 988 BPF_OFFLOAD_MAP_ALLOC, 989 BPF_OFFLOAD_MAP_FREE, 990 XDP_SETUP_XSK_POOL, 991 }; 992 993 struct bpf_prog_offload_ops; 994 struct netlink_ext_ack; 995 struct xdp_umem; 996 struct xdp_dev_bulk_queue; 997 struct bpf_xdp_link; 998 999 enum bpf_xdp_mode { 1000 XDP_MODE_SKB = 0, 1001 XDP_MODE_DRV = 1, 1002 XDP_MODE_HW = 2, 1003 __MAX_XDP_MODE 1004 }; 1005 1006 struct bpf_xdp_entity { 1007 struct bpf_prog *prog; 1008 struct bpf_xdp_link *link; 1009 }; 1010 1011 struct netdev_bpf { 1012 enum bpf_netdev_command command; 1013 union { 1014 /* XDP_SETUP_PROG */ 1015 struct { 1016 u32 flags; 1017 struct bpf_prog *prog; 1018 struct netlink_ext_ack *extack; 1019 }; 1020 /* BPF_OFFLOAD_MAP_ALLOC, BPF_OFFLOAD_MAP_FREE */ 1021 struct { 1022 struct bpf_offloaded_map *offmap; 1023 }; 1024 /* XDP_SETUP_XSK_POOL */ 1025 struct { 1026 struct xsk_buff_pool *pool; 1027 u16 queue_id; 1028 } xsk; 1029 }; 1030 }; 1031 1032 /* Flags for ndo_xsk_wakeup. */ 1033 #define XDP_WAKEUP_RX (1 << 0) 1034 #define XDP_WAKEUP_TX (1 << 1) 1035 1036 #ifdef CONFIG_XFRM_OFFLOAD 1037 struct xfrmdev_ops { 1038 int (*xdo_dev_state_add) (struct xfrm_state *x); 1039 void (*xdo_dev_state_delete) (struct xfrm_state *x); 1040 void (*xdo_dev_state_free) (struct xfrm_state *x); 1041 bool (*xdo_dev_offload_ok) (struct sk_buff *skb, 1042 struct xfrm_state *x); 1043 void (*xdo_dev_state_advance_esn) (struct xfrm_state *x); 1044 void (*xdo_dev_state_update_curlft) (struct xfrm_state *x); 1045 int (*xdo_dev_policy_add) (struct xfrm_policy *x); 1046 void (*xdo_dev_policy_delete) (struct xfrm_policy *x); 1047 void (*xdo_dev_policy_free) (struct xfrm_policy *x); 1048 }; 1049 #endif 1050 1051 struct dev_ifalias { 1052 struct rcu_head rcuhead; 1053 char ifalias[]; 1054 }; 1055 1056 struct devlink; 1057 struct tlsdev_ops; 1058 1059 struct netdev_net_notifier { 1060 struct list_head list; 1061 struct notifier_block *nb; 1062 }; 1063 1064 /* 1065 * This structure defines the management hooks for network devices. 1066 * The following hooks can be defined; unless noted otherwise, they are 1067 * optional and can be filled with a null pointer. 1068 * 1069 * int (*ndo_init)(struct net_device *dev); 1070 * This function is called once when a network device is registered. 1071 * The network device can use this for any late stage initialization 1072 * or semantic validation. It can fail with an error code which will 1073 * be propagated back to register_netdev. 1074 * 1075 * void (*ndo_uninit)(struct net_device *dev); 1076 * This function is called when device is unregistered or when registration 1077 * fails. It is not called if init fails. 1078 * 1079 * int (*ndo_open)(struct net_device *dev); 1080 * This function is called when a network device transitions to the up 1081 * state. 1082 * 1083 * int (*ndo_stop)(struct net_device *dev); 1084 * This function is called when a network device transitions to the down 1085 * state. 1086 * 1087 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb, 1088 * struct net_device *dev); 1089 * Called when a packet needs to be transmitted. 1090 * Returns NETDEV_TX_OK. Can return NETDEV_TX_BUSY, but you should stop 1091 * the queue before that can happen; it's for obsolete devices and weird 1092 * corner cases, but the stack really does a non-trivial amount 1093 * of useless work if you return NETDEV_TX_BUSY. 1094 * Required; cannot be NULL. 1095 * 1096 * netdev_features_t (*ndo_features_check)(struct sk_buff *skb, 1097 * struct net_device *dev 1098 * netdev_features_t features); 1099 * Called by core transmit path to determine if device is capable of 1100 * performing offload operations on a given packet. This is to give 1101 * the device an opportunity to implement any restrictions that cannot 1102 * be otherwise expressed by feature flags. The check is called with 1103 * the set of features that the stack has calculated and it returns 1104 * those the driver believes to be appropriate. 1105 * 1106 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb, 1107 * struct net_device *sb_dev); 1108 * Called to decide which queue to use when device supports multiple 1109 * transmit queues. 1110 * 1111 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags); 1112 * This function is called to allow device receiver to make 1113 * changes to configuration when multicast or promiscuous is enabled. 1114 * 1115 * void (*ndo_set_rx_mode)(struct net_device *dev); 1116 * This function is called device changes address list filtering. 1117 * If driver handles unicast address filtering, it should set 1118 * IFF_UNICAST_FLT in its priv_flags. 1119 * 1120 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr); 1121 * This function is called when the Media Access Control address 1122 * needs to be changed. If this interface is not defined, the 1123 * MAC address can not be changed. 1124 * 1125 * int (*ndo_validate_addr)(struct net_device *dev); 1126 * Test if Media Access Control address is valid for the device. 1127 * 1128 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd); 1129 * Old-style ioctl entry point. This is used internally by the 1130 * appletalk and ieee802154 subsystems but is no longer called by 1131 * the device ioctl handler. 1132 * 1133 * int (*ndo_siocbond)(struct net_device *dev, struct ifreq *ifr, int cmd); 1134 * Used by the bonding driver for its device specific ioctls: 1135 * SIOCBONDENSLAVE, SIOCBONDRELEASE, SIOCBONDSETHWADDR, SIOCBONDCHANGEACTIVE, 1136 * SIOCBONDSLAVEINFOQUERY, and SIOCBONDINFOQUERY 1137 * 1138 * * int (*ndo_eth_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd); 1139 * Called for ethernet specific ioctls: SIOCGMIIPHY, SIOCGMIIREG, 1140 * SIOCSMIIREG, SIOCSHWTSTAMP and SIOCGHWTSTAMP. 1141 * 1142 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map); 1143 * Used to set network devices bus interface parameters. This interface 1144 * is retained for legacy reasons; new devices should use the bus 1145 * interface (PCI) for low level management. 1146 * 1147 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu); 1148 * Called when a user wants to change the Maximum Transfer Unit 1149 * of a device. 1150 * 1151 * void (*ndo_tx_timeout)(struct net_device *dev, unsigned int txqueue); 1152 * Callback used when the transmitter has not made any progress 1153 * for dev->watchdog ticks. 1154 * 1155 * void (*ndo_get_stats64)(struct net_device *dev, 1156 * struct rtnl_link_stats64 *storage); 1157 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev); 1158 * Called when a user wants to get the network device usage 1159 * statistics. Drivers must do one of the following: 1160 * 1. Define @ndo_get_stats64 to fill in a zero-initialised 1161 * rtnl_link_stats64 structure passed by the caller. 1162 * 2. Define @ndo_get_stats to update a net_device_stats structure 1163 * (which should normally be dev->stats) and return a pointer to 1164 * it. The structure may be changed asynchronously only if each 1165 * field is written atomically. 1166 * 3. Update dev->stats asynchronously and atomically, and define 1167 * neither operation. 1168 * 1169 * bool (*ndo_has_offload_stats)(const struct net_device *dev, int attr_id) 1170 * Return true if this device supports offload stats of this attr_id. 1171 * 1172 * int (*ndo_get_offload_stats)(int attr_id, const struct net_device *dev, 1173 * void *attr_data) 1174 * Get statistics for offload operations by attr_id. Write it into the 1175 * attr_data pointer. 1176 * 1177 * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, __be16 proto, u16 vid); 1178 * If device supports VLAN filtering this function is called when a 1179 * VLAN id is registered. 1180 * 1181 * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, __be16 proto, u16 vid); 1182 * If device supports VLAN filtering this function is called when a 1183 * VLAN id is unregistered. 1184 * 1185 * void (*ndo_poll_controller)(struct net_device *dev); 1186 * 1187 * SR-IOV management functions. 1188 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac); 1189 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, 1190 * u8 qos, __be16 proto); 1191 * int (*ndo_set_vf_rate)(struct net_device *dev, int vf, int min_tx_rate, 1192 * int max_tx_rate); 1193 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting); 1194 * int (*ndo_set_vf_trust)(struct net_device *dev, int vf, bool setting); 1195 * int (*ndo_get_vf_config)(struct net_device *dev, 1196 * int vf, struct ifla_vf_info *ivf); 1197 * int (*ndo_set_vf_link_state)(struct net_device *dev, int vf, int link_state); 1198 * int (*ndo_set_vf_port)(struct net_device *dev, int vf, 1199 * struct nlattr *port[]); 1200 * 1201 * Enable or disable the VF ability to query its RSS Redirection Table and 1202 * Hash Key. This is needed since on some devices VF share this information 1203 * with PF and querying it may introduce a theoretical security risk. 1204 * int (*ndo_set_vf_rss_query_en)(struct net_device *dev, int vf, bool setting); 1205 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb); 1206 * int (*ndo_setup_tc)(struct net_device *dev, enum tc_setup_type type, 1207 * void *type_data); 1208 * Called to setup any 'tc' scheduler, classifier or action on @dev. 1209 * This is always called from the stack with the rtnl lock held and netif 1210 * tx queues stopped. This allows the netdevice to perform queue 1211 * management safely. 1212 * 1213 * Fiber Channel over Ethernet (FCoE) offload functions. 1214 * int (*ndo_fcoe_enable)(struct net_device *dev); 1215 * Called when the FCoE protocol stack wants to start using LLD for FCoE 1216 * so the underlying device can perform whatever needed configuration or 1217 * initialization to support acceleration of FCoE traffic. 1218 * 1219 * int (*ndo_fcoe_disable)(struct net_device *dev); 1220 * Called when the FCoE protocol stack wants to stop using LLD for FCoE 1221 * so the underlying device can perform whatever needed clean-ups to 1222 * stop supporting acceleration of FCoE traffic. 1223 * 1224 * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid, 1225 * struct scatterlist *sgl, unsigned int sgc); 1226 * Called when the FCoE Initiator wants to initialize an I/O that 1227 * is a possible candidate for Direct Data Placement (DDP). The LLD can 1228 * perform necessary setup and returns 1 to indicate the device is set up 1229 * successfully to perform DDP on this I/O, otherwise this returns 0. 1230 * 1231 * int (*ndo_fcoe_ddp_done)(struct net_device *dev, u16 xid); 1232 * Called when the FCoE Initiator/Target is done with the DDPed I/O as 1233 * indicated by the FC exchange id 'xid', so the underlying device can 1234 * clean up and reuse resources for later DDP requests. 1235 * 1236 * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid, 1237 * struct scatterlist *sgl, unsigned int sgc); 1238 * Called when the FCoE Target wants to initialize an I/O that 1239 * is a possible candidate for Direct Data Placement (DDP). The LLD can 1240 * perform necessary setup and returns 1 to indicate the device is set up 1241 * successfully to perform DDP on this I/O, otherwise this returns 0. 1242 * 1243 * int (*ndo_fcoe_get_hbainfo)(struct net_device *dev, 1244 * struct netdev_fcoe_hbainfo *hbainfo); 1245 * Called when the FCoE Protocol stack wants information on the underlying 1246 * device. This information is utilized by the FCoE protocol stack to 1247 * register attributes with Fiber Channel management service as per the 1248 * FC-GS Fabric Device Management Information(FDMI) specification. 1249 * 1250 * int (*ndo_fcoe_get_wwn)(struct net_device *dev, u64 *wwn, int type); 1251 * Called when the underlying device wants to override default World Wide 1252 * Name (WWN) generation mechanism in FCoE protocol stack to pass its own 1253 * World Wide Port Name (WWPN) or World Wide Node Name (WWNN) to the FCoE 1254 * protocol stack to use. 1255 * 1256 * RFS acceleration. 1257 * int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb, 1258 * u16 rxq_index, u32 flow_id); 1259 * Set hardware filter for RFS. rxq_index is the target queue index; 1260 * flow_id is a flow ID to be passed to rps_may_expire_flow() later. 1261 * Return the filter ID on success, or a negative error code. 1262 * 1263 * Slave management functions (for bridge, bonding, etc). 1264 * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev); 1265 * Called to make another netdev an underling. 1266 * 1267 * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev); 1268 * Called to release previously enslaved netdev. 1269 * 1270 * struct net_device *(*ndo_get_xmit_slave)(struct net_device *dev, 1271 * struct sk_buff *skb, 1272 * bool all_slaves); 1273 * Get the xmit slave of master device. If all_slaves is true, function 1274 * assume all the slaves can transmit. 1275 * 1276 * Feature/offload setting functions. 1277 * netdev_features_t (*ndo_fix_features)(struct net_device *dev, 1278 * netdev_features_t features); 1279 * Adjusts the requested feature flags according to device-specific 1280 * constraints, and returns the resulting flags. Must not modify 1281 * the device state. 1282 * 1283 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features); 1284 * Called to update device configuration to new features. Passed 1285 * feature set might be less than what was returned by ndo_fix_features()). 1286 * Must return >0 or -errno if it changed dev->features itself. 1287 * 1288 * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[], 1289 * struct net_device *dev, 1290 * const unsigned char *addr, u16 vid, u16 flags, 1291 * struct netlink_ext_ack *extack); 1292 * Adds an FDB entry to dev for addr. 1293 * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[], 1294 * struct net_device *dev, 1295 * const unsigned char *addr, u16 vid) 1296 * Deletes the FDB entry from dev coresponding to addr. 1297 * int (*ndo_fdb_del_bulk)(struct ndmsg *ndm, struct nlattr *tb[], 1298 * struct net_device *dev, 1299 * u16 vid, 1300 * struct netlink_ext_ack *extack); 1301 * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb, 1302 * struct net_device *dev, struct net_device *filter_dev, 1303 * int *idx) 1304 * Used to add FDB entries to dump requests. Implementers should add 1305 * entries to skb and update idx with the number of entries. 1306 * 1307 * int (*ndo_bridge_setlink)(struct net_device *dev, struct nlmsghdr *nlh, 1308 * u16 flags, struct netlink_ext_ack *extack) 1309 * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq, 1310 * struct net_device *dev, u32 filter_mask, 1311 * int nlflags) 1312 * int (*ndo_bridge_dellink)(struct net_device *dev, struct nlmsghdr *nlh, 1313 * u16 flags); 1314 * 1315 * int (*ndo_change_carrier)(struct net_device *dev, bool new_carrier); 1316 * Called to change device carrier. Soft-devices (like dummy, team, etc) 1317 * which do not represent real hardware may define this to allow their 1318 * userspace components to manage their virtual carrier state. Devices 1319 * that determine carrier state from physical hardware properties (eg 1320 * network cables) or protocol-dependent mechanisms (eg 1321 * USB_CDC_NOTIFY_NETWORK_CONNECTION) should NOT implement this function. 1322 * 1323 * int (*ndo_get_phys_port_id)(struct net_device *dev, 1324 * struct netdev_phys_item_id *ppid); 1325 * Called to get ID of physical port of this device. If driver does 1326 * not implement this, it is assumed that the hw is not able to have 1327 * multiple net devices on single physical port. 1328 * 1329 * int (*ndo_get_port_parent_id)(struct net_device *dev, 1330 * struct netdev_phys_item_id *ppid) 1331 * Called to get the parent ID of the physical port of this device. 1332 * 1333 * void* (*ndo_dfwd_add_station)(struct net_device *pdev, 1334 * struct net_device *dev) 1335 * Called by upper layer devices to accelerate switching or other 1336 * station functionality into hardware. 'pdev is the lowerdev 1337 * to use for the offload and 'dev' is the net device that will 1338 * back the offload. Returns a pointer to the private structure 1339 * the upper layer will maintain. 1340 * void (*ndo_dfwd_del_station)(struct net_device *pdev, void *priv) 1341 * Called by upper layer device to delete the station created 1342 * by 'ndo_dfwd_add_station'. 'pdev' is the net device backing 1343 * the station and priv is the structure returned by the add 1344 * operation. 1345 * int (*ndo_set_tx_maxrate)(struct net_device *dev, 1346 * int queue_index, u32 maxrate); 1347 * Called when a user wants to set a max-rate limitation of specific 1348 * TX queue. 1349 * int (*ndo_get_iflink)(const struct net_device *dev); 1350 * Called to get the iflink value of this device. 1351 * int (*ndo_fill_metadata_dst)(struct net_device *dev, struct sk_buff *skb); 1352 * This function is used to get egress tunnel information for given skb. 1353 * This is useful for retrieving outer tunnel header parameters while 1354 * sampling packet. 1355 * void (*ndo_set_rx_headroom)(struct net_device *dev, int needed_headroom); 1356 * This function is used to specify the headroom that the skb must 1357 * consider when allocation skb during packet reception. Setting 1358 * appropriate rx headroom value allows avoiding skb head copy on 1359 * forward. Setting a negative value resets the rx headroom to the 1360 * default value. 1361 * int (*ndo_bpf)(struct net_device *dev, struct netdev_bpf *bpf); 1362 * This function is used to set or query state related to XDP on the 1363 * netdevice and manage BPF offload. See definition of 1364 * enum bpf_netdev_command for details. 1365 * int (*ndo_xdp_xmit)(struct net_device *dev, int n, struct xdp_frame **xdp, 1366 * u32 flags); 1367 * This function is used to submit @n XDP packets for transmit on a 1368 * netdevice. Returns number of frames successfully transmitted, frames 1369 * that got dropped are freed/returned via xdp_return_frame(). 1370 * Returns negative number, means general error invoking ndo, meaning 1371 * no frames were xmit'ed and core-caller will free all frames. 1372 * struct net_device *(*ndo_xdp_get_xmit_slave)(struct net_device *dev, 1373 * struct xdp_buff *xdp); 1374 * Get the xmit slave of master device based on the xdp_buff. 1375 * int (*ndo_xsk_wakeup)(struct net_device *dev, u32 queue_id, u32 flags); 1376 * This function is used to wake up the softirq, ksoftirqd or kthread 1377 * responsible for sending and/or receiving packets on a specific 1378 * queue id bound to an AF_XDP socket. The flags field specifies if 1379 * only RX, only Tx, or both should be woken up using the flags 1380 * XDP_WAKEUP_RX and XDP_WAKEUP_TX. 1381 * int (*ndo_tunnel_ctl)(struct net_device *dev, struct ip_tunnel_parm *p, 1382 * int cmd); 1383 * Add, change, delete or get information on an IPv4 tunnel. 1384 * struct net_device *(*ndo_get_peer_dev)(struct net_device *dev); 1385 * If a device is paired with a peer device, return the peer instance. 1386 * The caller must be under RCU read context. 1387 * int (*ndo_fill_forward_path)(struct net_device_path_ctx *ctx, struct net_device_path *path); 1388 * Get the forwarding path to reach the real device from the HW destination address 1389 * ktime_t (*ndo_get_tstamp)(struct net_device *dev, 1390 * const struct skb_shared_hwtstamps *hwtstamps, 1391 * bool cycles); 1392 * Get hardware timestamp based on normal/adjustable time or free running 1393 * cycle counter. This function is required if physical clock supports a 1394 * free running cycle counter. 1395 */ 1396 struct net_device_ops { 1397 int (*ndo_init)(struct net_device *dev); 1398 void (*ndo_uninit)(struct net_device *dev); 1399 int (*ndo_open)(struct net_device *dev); 1400 int (*ndo_stop)(struct net_device *dev); 1401 netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb, 1402 struct net_device *dev); 1403 netdev_features_t (*ndo_features_check)(struct sk_buff *skb, 1404 struct net_device *dev, 1405 netdev_features_t features); 1406 u16 (*ndo_select_queue)(struct net_device *dev, 1407 struct sk_buff *skb, 1408 struct net_device *sb_dev); 1409 void (*ndo_change_rx_flags)(struct net_device *dev, 1410 int flags); 1411 void (*ndo_set_rx_mode)(struct net_device *dev); 1412 int (*ndo_set_mac_address)(struct net_device *dev, 1413 void *addr); 1414 int (*ndo_validate_addr)(struct net_device *dev); 1415 int (*ndo_do_ioctl)(struct net_device *dev, 1416 struct ifreq *ifr, int cmd); 1417 int (*ndo_eth_ioctl)(struct net_device *dev, 1418 struct ifreq *ifr, int cmd); 1419 int (*ndo_siocbond)(struct net_device *dev, 1420 struct ifreq *ifr, int cmd); 1421 int (*ndo_siocwandev)(struct net_device *dev, 1422 struct if_settings *ifs); 1423 int (*ndo_siocdevprivate)(struct net_device *dev, 1424 struct ifreq *ifr, 1425 void __user *data, int cmd); 1426 int (*ndo_set_config)(struct net_device *dev, 1427 struct ifmap *map); 1428 int (*ndo_change_mtu)(struct net_device *dev, 1429 int new_mtu); 1430 int (*ndo_neigh_setup)(struct net_device *dev, 1431 struct neigh_parms *); 1432 void (*ndo_tx_timeout) (struct net_device *dev, 1433 unsigned int txqueue); 1434 1435 void (*ndo_get_stats64)(struct net_device *dev, 1436 struct rtnl_link_stats64 *storage); 1437 bool (*ndo_has_offload_stats)(const struct net_device *dev, int attr_id); 1438 int (*ndo_get_offload_stats)(int attr_id, 1439 const struct net_device *dev, 1440 void *attr_data); 1441 struct net_device_stats* (*ndo_get_stats)(struct net_device *dev); 1442 1443 int (*ndo_vlan_rx_add_vid)(struct net_device *dev, 1444 __be16 proto, u16 vid); 1445 int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, 1446 __be16 proto, u16 vid); 1447 #ifdef CONFIG_NET_POLL_CONTROLLER 1448 void (*ndo_poll_controller)(struct net_device *dev); 1449 int (*ndo_netpoll_setup)(struct net_device *dev, 1450 struct netpoll_info *info); 1451 void (*ndo_netpoll_cleanup)(struct net_device *dev); 1452 #endif 1453 int (*ndo_set_vf_mac)(struct net_device *dev, 1454 int queue, u8 *mac); 1455 int (*ndo_set_vf_vlan)(struct net_device *dev, 1456 int queue, u16 vlan, 1457 u8 qos, __be16 proto); 1458 int (*ndo_set_vf_rate)(struct net_device *dev, 1459 int vf, int min_tx_rate, 1460 int max_tx_rate); 1461 int (*ndo_set_vf_spoofchk)(struct net_device *dev, 1462 int vf, bool setting); 1463 int (*ndo_set_vf_trust)(struct net_device *dev, 1464 int vf, bool setting); 1465 int (*ndo_get_vf_config)(struct net_device *dev, 1466 int vf, 1467 struct ifla_vf_info *ivf); 1468 int (*ndo_set_vf_link_state)(struct net_device *dev, 1469 int vf, int link_state); 1470 int (*ndo_get_vf_stats)(struct net_device *dev, 1471 int vf, 1472 struct ifla_vf_stats 1473 *vf_stats); 1474 int (*ndo_set_vf_port)(struct net_device *dev, 1475 int vf, 1476 struct nlattr *port[]); 1477 int (*ndo_get_vf_port)(struct net_device *dev, 1478 int vf, struct sk_buff *skb); 1479 int (*ndo_get_vf_guid)(struct net_device *dev, 1480 int vf, 1481 struct ifla_vf_guid *node_guid, 1482 struct ifla_vf_guid *port_guid); 1483 int (*ndo_set_vf_guid)(struct net_device *dev, 1484 int vf, u64 guid, 1485 int guid_type); 1486 int (*ndo_set_vf_rss_query_en)( 1487 struct net_device *dev, 1488 int vf, bool setting); 1489 int (*ndo_setup_tc)(struct net_device *dev, 1490 enum tc_setup_type type, 1491 void *type_data); 1492 #if IS_ENABLED(CONFIG_FCOE) 1493 int (*ndo_fcoe_enable)(struct net_device *dev); 1494 int (*ndo_fcoe_disable)(struct net_device *dev); 1495 int (*ndo_fcoe_ddp_setup)(struct net_device *dev, 1496 u16 xid, 1497 struct scatterlist *sgl, 1498 unsigned int sgc); 1499 int (*ndo_fcoe_ddp_done)(struct net_device *dev, 1500 u16 xid); 1501 int (*ndo_fcoe_ddp_target)(struct net_device *dev, 1502 u16 xid, 1503 struct scatterlist *sgl, 1504 unsigned int sgc); 1505 int (*ndo_fcoe_get_hbainfo)(struct net_device *dev, 1506 struct netdev_fcoe_hbainfo *hbainfo); 1507 #endif 1508 1509 #if IS_ENABLED(CONFIG_LIBFCOE) 1510 #define NETDEV_FCOE_WWNN 0 1511 #define NETDEV_FCOE_WWPN 1 1512 int (*ndo_fcoe_get_wwn)(struct net_device *dev, 1513 u64 *wwn, int type); 1514 #endif 1515 1516 #ifdef CONFIG_RFS_ACCEL 1517 int (*ndo_rx_flow_steer)(struct net_device *dev, 1518 const struct sk_buff *skb, 1519 u16 rxq_index, 1520 u32 flow_id); 1521 #endif 1522 int (*ndo_add_slave)(struct net_device *dev, 1523 struct net_device *slave_dev, 1524 struct netlink_ext_ack *extack); 1525 int (*ndo_del_slave)(struct net_device *dev, 1526 struct net_device *slave_dev); 1527 struct net_device* (*ndo_get_xmit_slave)(struct net_device *dev, 1528 struct sk_buff *skb, 1529 bool all_slaves); 1530 struct net_device* (*ndo_sk_get_lower_dev)(struct net_device *dev, 1531 struct sock *sk); 1532 netdev_features_t (*ndo_fix_features)(struct net_device *dev, 1533 netdev_features_t features); 1534 int (*ndo_set_features)(struct net_device *dev, 1535 netdev_features_t features); 1536 int (*ndo_neigh_construct)(struct net_device *dev, 1537 struct neighbour *n); 1538 void (*ndo_neigh_destroy)(struct net_device *dev, 1539 struct neighbour *n); 1540 1541 int (*ndo_fdb_add)(struct ndmsg *ndm, 1542 struct nlattr *tb[], 1543 struct net_device *dev, 1544 const unsigned char *addr, 1545 u16 vid, 1546 u16 flags, 1547 struct netlink_ext_ack *extack); 1548 int (*ndo_fdb_del)(struct ndmsg *ndm, 1549 struct nlattr *tb[], 1550 struct net_device *dev, 1551 const unsigned char *addr, 1552 u16 vid, struct netlink_ext_ack *extack); 1553 int (*ndo_fdb_del_bulk)(struct ndmsg *ndm, 1554 struct nlattr *tb[], 1555 struct net_device *dev, 1556 u16 vid, 1557 struct netlink_ext_ack *extack); 1558 int (*ndo_fdb_dump)(struct sk_buff *skb, 1559 struct netlink_callback *cb, 1560 struct net_device *dev, 1561 struct net_device *filter_dev, 1562 int *idx); 1563 int (*ndo_fdb_get)(struct sk_buff *skb, 1564 struct nlattr *tb[], 1565 struct net_device *dev, 1566 const unsigned char *addr, 1567 u16 vid, u32 portid, u32 seq, 1568 struct netlink_ext_ack *extack); 1569 int (*ndo_bridge_setlink)(struct net_device *dev, 1570 struct nlmsghdr *nlh, 1571 u16 flags, 1572 struct netlink_ext_ack *extack); 1573 int (*ndo_bridge_getlink)(struct sk_buff *skb, 1574 u32 pid, u32 seq, 1575 struct net_device *dev, 1576 u32 filter_mask, 1577 int nlflags); 1578 int (*ndo_bridge_dellink)(struct net_device *dev, 1579 struct nlmsghdr *nlh, 1580 u16 flags); 1581 int (*ndo_change_carrier)(struct net_device *dev, 1582 bool new_carrier); 1583 int (*ndo_get_phys_port_id)(struct net_device *dev, 1584 struct netdev_phys_item_id *ppid); 1585 int (*ndo_get_port_parent_id)(struct net_device *dev, 1586 struct netdev_phys_item_id *ppid); 1587 int (*ndo_get_phys_port_name)(struct net_device *dev, 1588 char *name, size_t len); 1589 void* (*ndo_dfwd_add_station)(struct net_device *pdev, 1590 struct net_device *dev); 1591 void (*ndo_dfwd_del_station)(struct net_device *pdev, 1592 void *priv); 1593 1594 int (*ndo_set_tx_maxrate)(struct net_device *dev, 1595 int queue_index, 1596 u32 maxrate); 1597 int (*ndo_get_iflink)(const struct net_device *dev); 1598 int (*ndo_fill_metadata_dst)(struct net_device *dev, 1599 struct sk_buff *skb); 1600 void (*ndo_set_rx_headroom)(struct net_device *dev, 1601 int needed_headroom); 1602 int (*ndo_bpf)(struct net_device *dev, 1603 struct netdev_bpf *bpf); 1604 int (*ndo_xdp_xmit)(struct net_device *dev, int n, 1605 struct xdp_frame **xdp, 1606 u32 flags); 1607 struct net_device * (*ndo_xdp_get_xmit_slave)(struct net_device *dev, 1608 struct xdp_buff *xdp); 1609 int (*ndo_xsk_wakeup)(struct net_device *dev, 1610 u32 queue_id, u32 flags); 1611 int (*ndo_tunnel_ctl)(struct net_device *dev, 1612 struct ip_tunnel_parm *p, int cmd); 1613 struct net_device * (*ndo_get_peer_dev)(struct net_device *dev); 1614 int (*ndo_fill_forward_path)(struct net_device_path_ctx *ctx, 1615 struct net_device_path *path); 1616 ktime_t (*ndo_get_tstamp)(struct net_device *dev, 1617 const struct skb_shared_hwtstamps *hwtstamps, 1618 bool cycles); 1619 }; 1620 1621 /** 1622 * enum netdev_priv_flags - &struct net_device priv_flags 1623 * 1624 * These are the &struct net_device, they are only set internally 1625 * by drivers and used in the kernel. These flags are invisible to 1626 * userspace; this means that the order of these flags can change 1627 * during any kernel release. 1628 * 1629 * You should have a pretty good reason to be extending these flags. 1630 * 1631 * @IFF_802_1Q_VLAN: 802.1Q VLAN device 1632 * @IFF_EBRIDGE: Ethernet bridging device 1633 * @IFF_BONDING: bonding master or slave 1634 * @IFF_ISATAP: ISATAP interface (RFC4214) 1635 * @IFF_WAN_HDLC: WAN HDLC device 1636 * @IFF_XMIT_DST_RELEASE: dev_hard_start_xmit() is allowed to 1637 * release skb->dst 1638 * @IFF_DONT_BRIDGE: disallow bridging this ether dev 1639 * @IFF_DISABLE_NETPOLL: disable netpoll at run-time 1640 * @IFF_MACVLAN_PORT: device used as macvlan port 1641 * @IFF_BRIDGE_PORT: device used as bridge port 1642 * @IFF_OVS_DATAPATH: device used as Open vSwitch datapath port 1643 * @IFF_TX_SKB_SHARING: The interface supports sharing skbs on transmit 1644 * @IFF_UNICAST_FLT: Supports unicast filtering 1645 * @IFF_TEAM_PORT: device used as team port 1646 * @IFF_SUPP_NOFCS: device supports sending custom FCS 1647 * @IFF_LIVE_ADDR_CHANGE: device supports hardware address 1648 * change when it's running 1649 * @IFF_MACVLAN: Macvlan device 1650 * @IFF_XMIT_DST_RELEASE_PERM: IFF_XMIT_DST_RELEASE not taking into account 1651 * underlying stacked devices 1652 * @IFF_L3MDEV_MASTER: device is an L3 master device 1653 * @IFF_NO_QUEUE: device can run without qdisc attached 1654 * @IFF_OPENVSWITCH: device is a Open vSwitch master 1655 * @IFF_L3MDEV_SLAVE: device is enslaved to an L3 master device 1656 * @IFF_TEAM: device is a team device 1657 * @IFF_RXFH_CONFIGURED: device has had Rx Flow indirection table configured 1658 * @IFF_PHONY_HEADROOM: the headroom value is controlled by an external 1659 * entity (i.e. the master device for bridged veth) 1660 * @IFF_MACSEC: device is a MACsec device 1661 * @IFF_NO_RX_HANDLER: device doesn't support the rx_handler hook 1662 * @IFF_FAILOVER: device is a failover master device 1663 * @IFF_FAILOVER_SLAVE: device is lower dev of a failover master device 1664 * @IFF_L3MDEV_RX_HANDLER: only invoke the rx handler of L3 master device 1665 * @IFF_TX_SKB_NO_LINEAR: device/driver is capable of xmitting frames with 1666 * skb_headlen(skb) == 0 (data starts from frag0) 1667 * @IFF_CHANGE_PROTO_DOWN: device supports setting carrier via IFLA_PROTO_DOWN 1668 */ 1669 enum netdev_priv_flags { 1670 IFF_802_1Q_VLAN = 1<<0, 1671 IFF_EBRIDGE = 1<<1, 1672 IFF_BONDING = 1<<2, 1673 IFF_ISATAP = 1<<3, 1674 IFF_WAN_HDLC = 1<<4, 1675 IFF_XMIT_DST_RELEASE = 1<<5, 1676 IFF_DONT_BRIDGE = 1<<6, 1677 IFF_DISABLE_NETPOLL = 1<<7, 1678 IFF_MACVLAN_PORT = 1<<8, 1679 IFF_BRIDGE_PORT = 1<<9, 1680 IFF_OVS_DATAPATH = 1<<10, 1681 IFF_TX_SKB_SHARING = 1<<11, 1682 IFF_UNICAST_FLT = 1<<12, 1683 IFF_TEAM_PORT = 1<<13, 1684 IFF_SUPP_NOFCS = 1<<14, 1685 IFF_LIVE_ADDR_CHANGE = 1<<15, 1686 IFF_MACVLAN = 1<<16, 1687 IFF_XMIT_DST_RELEASE_PERM = 1<<17, 1688 IFF_L3MDEV_MASTER = 1<<18, 1689 IFF_NO_QUEUE = 1<<19, 1690 IFF_OPENVSWITCH = 1<<20, 1691 IFF_L3MDEV_SLAVE = 1<<21, 1692 IFF_TEAM = 1<<22, 1693 IFF_RXFH_CONFIGURED = 1<<23, 1694 IFF_PHONY_HEADROOM = 1<<24, 1695 IFF_MACSEC = 1<<25, 1696 IFF_NO_RX_HANDLER = 1<<26, 1697 IFF_FAILOVER = 1<<27, 1698 IFF_FAILOVER_SLAVE = 1<<28, 1699 IFF_L3MDEV_RX_HANDLER = 1<<29, 1700 /* was IFF_LIVE_RENAME_OK */ 1701 IFF_TX_SKB_NO_LINEAR = BIT_ULL(31), 1702 IFF_CHANGE_PROTO_DOWN = BIT_ULL(32), 1703 }; 1704 1705 #define IFF_802_1Q_VLAN IFF_802_1Q_VLAN 1706 #define IFF_EBRIDGE IFF_EBRIDGE 1707 #define IFF_BONDING IFF_BONDING 1708 #define IFF_ISATAP IFF_ISATAP 1709 #define IFF_WAN_HDLC IFF_WAN_HDLC 1710 #define IFF_XMIT_DST_RELEASE IFF_XMIT_DST_RELEASE 1711 #define IFF_DONT_BRIDGE IFF_DONT_BRIDGE 1712 #define IFF_DISABLE_NETPOLL IFF_DISABLE_NETPOLL 1713 #define IFF_MACVLAN_PORT IFF_MACVLAN_PORT 1714 #define IFF_BRIDGE_PORT IFF_BRIDGE_PORT 1715 #define IFF_OVS_DATAPATH IFF_OVS_DATAPATH 1716 #define IFF_TX_SKB_SHARING IFF_TX_SKB_SHARING 1717 #define IFF_UNICAST_FLT IFF_UNICAST_FLT 1718 #define IFF_TEAM_PORT IFF_TEAM_PORT 1719 #define IFF_SUPP_NOFCS IFF_SUPP_NOFCS 1720 #define IFF_LIVE_ADDR_CHANGE IFF_LIVE_ADDR_CHANGE 1721 #define IFF_MACVLAN IFF_MACVLAN 1722 #define IFF_XMIT_DST_RELEASE_PERM IFF_XMIT_DST_RELEASE_PERM 1723 #define IFF_L3MDEV_MASTER IFF_L3MDEV_MASTER 1724 #define IFF_NO_QUEUE IFF_NO_QUEUE 1725 #define IFF_OPENVSWITCH IFF_OPENVSWITCH 1726 #define IFF_L3MDEV_SLAVE IFF_L3MDEV_SLAVE 1727 #define IFF_TEAM IFF_TEAM 1728 #define IFF_RXFH_CONFIGURED IFF_RXFH_CONFIGURED 1729 #define IFF_PHONY_HEADROOM IFF_PHONY_HEADROOM 1730 #define IFF_MACSEC IFF_MACSEC 1731 #define IFF_NO_RX_HANDLER IFF_NO_RX_HANDLER 1732 #define IFF_FAILOVER IFF_FAILOVER 1733 #define IFF_FAILOVER_SLAVE IFF_FAILOVER_SLAVE 1734 #define IFF_L3MDEV_RX_HANDLER IFF_L3MDEV_RX_HANDLER 1735 #define IFF_TX_SKB_NO_LINEAR IFF_TX_SKB_NO_LINEAR 1736 1737 /* Specifies the type of the struct net_device::ml_priv pointer */ 1738 enum netdev_ml_priv_type { 1739 ML_PRIV_NONE, 1740 ML_PRIV_CAN, 1741 }; 1742 1743 /** 1744 * struct net_device - The DEVICE structure. 1745 * 1746 * Actually, this whole structure is a big mistake. It mixes I/O 1747 * data with strictly "high-level" data, and it has to know about 1748 * almost every data structure used in the INET module. 1749 * 1750 * @name: This is the first field of the "visible" part of this structure 1751 * (i.e. as seen by users in the "Space.c" file). It is the name 1752 * of the interface. 1753 * 1754 * @name_node: Name hashlist node 1755 * @ifalias: SNMP alias 1756 * @mem_end: Shared memory end 1757 * @mem_start: Shared memory start 1758 * @base_addr: Device I/O address 1759 * @irq: Device IRQ number 1760 * 1761 * @state: Generic network queuing layer state, see netdev_state_t 1762 * @dev_list: The global list of network devices 1763 * @napi_list: List entry used for polling NAPI devices 1764 * @unreg_list: List entry when we are unregistering the 1765 * device; see the function unregister_netdev 1766 * @close_list: List entry used when we are closing the device 1767 * @ptype_all: Device-specific packet handlers for all protocols 1768 * @ptype_specific: Device-specific, protocol-specific packet handlers 1769 * 1770 * @adj_list: Directly linked devices, like slaves for bonding 1771 * @features: Currently active device features 1772 * @hw_features: User-changeable features 1773 * 1774 * @wanted_features: User-requested features 1775 * @vlan_features: Mask of features inheritable by VLAN devices 1776 * 1777 * @hw_enc_features: Mask of features inherited by encapsulating devices 1778 * This field indicates what encapsulation 1779 * offloads the hardware is capable of doing, 1780 * and drivers will need to set them appropriately. 1781 * 1782 * @mpls_features: Mask of features inheritable by MPLS 1783 * @gso_partial_features: value(s) from NETIF_F_GSO\* 1784 * 1785 * @ifindex: interface index 1786 * @group: The group the device belongs to 1787 * 1788 * @stats: Statistics struct, which was left as a legacy, use 1789 * rtnl_link_stats64 instead 1790 * 1791 * @core_stats: core networking counters, 1792 * do not use this in drivers 1793 * @carrier_up_count: Number of times the carrier has been up 1794 * @carrier_down_count: Number of times the carrier has been down 1795 * 1796 * @wireless_handlers: List of functions to handle Wireless Extensions, 1797 * instead of ioctl, 1798 * see <net/iw_handler.h> for details. 1799 * @wireless_data: Instance data managed by the core of wireless extensions 1800 * 1801 * @netdev_ops: Includes several pointers to callbacks, 1802 * if one wants to override the ndo_*() functions 1803 * @ethtool_ops: Management operations 1804 * @l3mdev_ops: Layer 3 master device operations 1805 * @ndisc_ops: Includes callbacks for different IPv6 neighbour 1806 * discovery handling. Necessary for e.g. 6LoWPAN. 1807 * @xfrmdev_ops: Transformation offload operations 1808 * @tlsdev_ops: Transport Layer Security offload operations 1809 * @header_ops: Includes callbacks for creating,parsing,caching,etc 1810 * of Layer 2 headers. 1811 * 1812 * @flags: Interface flags (a la BSD) 1813 * @priv_flags: Like 'flags' but invisible to userspace, 1814 * see if.h for the definitions 1815 * @gflags: Global flags ( kept as legacy ) 1816 * @padded: How much padding added by alloc_netdev() 1817 * @operstate: RFC2863 operstate 1818 * @link_mode: Mapping policy to operstate 1819 * @if_port: Selectable AUI, TP, ... 1820 * @dma: DMA channel 1821 * @mtu: Interface MTU value 1822 * @min_mtu: Interface Minimum MTU value 1823 * @max_mtu: Interface Maximum MTU value 1824 * @type: Interface hardware type 1825 * @hard_header_len: Maximum hardware header length. 1826 * @min_header_len: Minimum hardware header length 1827 * 1828 * @needed_headroom: Extra headroom the hardware may need, but not in all 1829 * cases can this be guaranteed 1830 * @needed_tailroom: Extra tailroom the hardware may need, but not in all 1831 * cases can this be guaranteed. Some cases also use 1832 * LL_MAX_HEADER instead to allocate the skb 1833 * 1834 * interface address info: 1835 * 1836 * @perm_addr: Permanent hw address 1837 * @addr_assign_type: Hw address assignment type 1838 * @addr_len: Hardware address length 1839 * @upper_level: Maximum depth level of upper devices. 1840 * @lower_level: Maximum depth level of lower devices. 1841 * @neigh_priv_len: Used in neigh_alloc() 1842 * @dev_id: Used to differentiate devices that share 1843 * the same link layer address 1844 * @dev_port: Used to differentiate devices that share 1845 * the same function 1846 * @addr_list_lock: XXX: need comments on this one 1847 * @name_assign_type: network interface name assignment type 1848 * @uc_promisc: Counter that indicates promiscuous mode 1849 * has been enabled due to the need to listen to 1850 * additional unicast addresses in a device that 1851 * does not implement ndo_set_rx_mode() 1852 * @uc: unicast mac addresses 1853 * @mc: multicast mac addresses 1854 * @dev_addrs: list of device hw addresses 1855 * @queues_kset: Group of all Kobjects in the Tx and RX queues 1856 * @promiscuity: Number of times the NIC is told to work in 1857 * promiscuous mode; if it becomes 0 the NIC will 1858 * exit promiscuous mode 1859 * @allmulti: Counter, enables or disables allmulticast mode 1860 * 1861 * @vlan_info: VLAN info 1862 * @dsa_ptr: dsa specific data 1863 * @tipc_ptr: TIPC specific data 1864 * @atalk_ptr: AppleTalk link 1865 * @ip_ptr: IPv4 specific data 1866 * @ip6_ptr: IPv6 specific data 1867 * @ax25_ptr: AX.25 specific data 1868 * @ieee80211_ptr: IEEE 802.11 specific data, assign before registering 1869 * @ieee802154_ptr: IEEE 802.15.4 low-rate Wireless Personal Area Network 1870 * device struct 1871 * @mpls_ptr: mpls_dev struct pointer 1872 * @mctp_ptr: MCTP specific data 1873 * 1874 * @dev_addr: Hw address (before bcast, 1875 * because most packets are unicast) 1876 * 1877 * @_rx: Array of RX queues 1878 * @num_rx_queues: Number of RX queues 1879 * allocated at register_netdev() time 1880 * @real_num_rx_queues: Number of RX queues currently active in device 1881 * @xdp_prog: XDP sockets filter program pointer 1882 * @gro_flush_timeout: timeout for GRO layer in NAPI 1883 * @napi_defer_hard_irqs: If not zero, provides a counter that would 1884 * allow to avoid NIC hard IRQ, on busy queues. 1885 * 1886 * @rx_handler: handler for received packets 1887 * @rx_handler_data: XXX: need comments on this one 1888 * @miniq_ingress: ingress/clsact qdisc specific data for 1889 * ingress processing 1890 * @ingress_queue: XXX: need comments on this one 1891 * @nf_hooks_ingress: netfilter hooks executed for ingress packets 1892 * @broadcast: hw bcast address 1893 * 1894 * @rx_cpu_rmap: CPU reverse-mapping for RX completion interrupts, 1895 * indexed by RX queue number. Assigned by driver. 1896 * This must only be set if the ndo_rx_flow_steer 1897 * operation is defined 1898 * @index_hlist: Device index hash chain 1899 * 1900 * @_tx: Array of TX queues 1901 * @num_tx_queues: Number of TX queues allocated at alloc_netdev_mq() time 1902 * @real_num_tx_queues: Number of TX queues currently active in device 1903 * @qdisc: Root qdisc from userspace point of view 1904 * @tx_queue_len: Max frames per queue allowed 1905 * @tx_global_lock: XXX: need comments on this one 1906 * @xdp_bulkq: XDP device bulk queue 1907 * @xps_maps: all CPUs/RXQs maps for XPS device 1908 * 1909 * @xps_maps: XXX: need comments on this one 1910 * @miniq_egress: clsact qdisc specific data for 1911 * egress processing 1912 * @nf_hooks_egress: netfilter hooks executed for egress packets 1913 * @qdisc_hash: qdisc hash table 1914 * @watchdog_timeo: Represents the timeout that is used by 1915 * the watchdog (see dev_watchdog()) 1916 * @watchdog_timer: List of timers 1917 * 1918 * @proto_down_reason: reason a netdev interface is held down 1919 * @pcpu_refcnt: Number of references to this device 1920 * @dev_refcnt: Number of references to this device 1921 * @refcnt_tracker: Tracker directory for tracked references to this device 1922 * @todo_list: Delayed register/unregister 1923 * @link_watch_list: XXX: need comments on this one 1924 * 1925 * @reg_state: Register/unregister state machine 1926 * @dismantle: Device is going to be freed 1927 * @rtnl_link_state: This enum represents the phases of creating 1928 * a new link 1929 * 1930 * @needs_free_netdev: Should unregister perform free_netdev? 1931 * @priv_destructor: Called from unregister 1932 * @npinfo: XXX: need comments on this one 1933 * @nd_net: Network namespace this network device is inside 1934 * 1935 * @ml_priv: Mid-layer private 1936 * @ml_priv_type: Mid-layer private type 1937 * @lstats: Loopback statistics 1938 * @tstats: Tunnel statistics 1939 * @dstats: Dummy statistics 1940 * @vstats: Virtual ethernet statistics 1941 * 1942 * @garp_port: GARP 1943 * @mrp_port: MRP 1944 * 1945 * @dm_private: Drop monitor private 1946 * 1947 * @dev: Class/net/name entry 1948 * @sysfs_groups: Space for optional device, statistics and wireless 1949 * sysfs groups 1950 * 1951 * @sysfs_rx_queue_group: Space for optional per-rx queue attributes 1952 * @rtnl_link_ops: Rtnl_link_ops 1953 * 1954 * @gso_max_size: Maximum size of generic segmentation offload 1955 * @tso_max_size: Device (as in HW) limit on the max TSO request size 1956 * @gso_max_segs: Maximum number of segments that can be passed to the 1957 * NIC for GSO 1958 * @tso_max_segs: Device (as in HW) limit on the max TSO segment count 1959 * 1960 * @dcbnl_ops: Data Center Bridging netlink ops 1961 * @num_tc: Number of traffic classes in the net device 1962 * @tc_to_txq: XXX: need comments on this one 1963 * @prio_tc_map: XXX: need comments on this one 1964 * 1965 * @fcoe_ddp_xid: Max exchange id for FCoE LRO by ddp 1966 * 1967 * @priomap: XXX: need comments on this one 1968 * @phydev: Physical device may attach itself 1969 * for hardware timestamping 1970 * @sfp_bus: attached &struct sfp_bus structure. 1971 * 1972 * @qdisc_tx_busylock: lockdep class annotating Qdisc->busylock spinlock 1973 * 1974 * @proto_down: protocol port state information can be sent to the 1975 * switch driver and used to set the phys state of the 1976 * switch port. 1977 * 1978 * @wol_enabled: Wake-on-LAN is enabled 1979 * 1980 * @threaded: napi threaded mode is enabled 1981 * 1982 * @net_notifier_list: List of per-net netdev notifier block 1983 * that follow this device when it is moved 1984 * to another network namespace. 1985 * 1986 * @macsec_ops: MACsec offloading ops 1987 * 1988 * @udp_tunnel_nic_info: static structure describing the UDP tunnel 1989 * offload capabilities of the device 1990 * @udp_tunnel_nic: UDP tunnel offload state 1991 * @xdp_state: stores info on attached XDP BPF programs 1992 * 1993 * @nested_level: Used as a parameter of spin_lock_nested() of 1994 * dev->addr_list_lock. 1995 * @unlink_list: As netif_addr_lock() can be called recursively, 1996 * keep a list of interfaces to be deleted. 1997 * @gro_max_size: Maximum size of aggregated packet in generic 1998 * receive offload (GRO) 1999 * 2000 * @dev_addr_shadow: Copy of @dev_addr to catch direct writes. 2001 * @linkwatch_dev_tracker: refcount tracker used by linkwatch. 2002 * @watchdog_dev_tracker: refcount tracker used by watchdog. 2003 * @dev_registered_tracker: tracker for reference held while 2004 * registered 2005 * @offload_xstats_l3: L3 HW stats for this netdevice. 2006 * 2007 * @devlink_port: Pointer to related devlink port structure. 2008 * Assigned by a driver before netdev registration using 2009 * SET_NETDEV_DEVLINK_PORT macro. This pointer is static 2010 * during the time netdevice is registered. 2011 * 2012 * FIXME: cleanup struct net_device such that network protocol info 2013 * moves out. 2014 */ 2015 2016 struct net_device { 2017 char name[IFNAMSIZ]; 2018 struct netdev_name_node *name_node; 2019 struct dev_ifalias __rcu *ifalias; 2020 /* 2021 * I/O specific fields 2022 * FIXME: Merge these and struct ifmap into one 2023 */ 2024 unsigned long mem_end; 2025 unsigned long mem_start; 2026 unsigned long base_addr; 2027 2028 /* 2029 * Some hardware also needs these fields (state,dev_list, 2030 * napi_list,unreg_list,close_list) but they are not 2031 * part of the usual set specified in Space.c. 2032 */ 2033 2034 unsigned long state; 2035 2036 struct list_head dev_list; 2037 struct list_head napi_list; 2038 struct list_head unreg_list; 2039 struct list_head close_list; 2040 struct list_head ptype_all; 2041 struct list_head ptype_specific; 2042 2043 struct { 2044 struct list_head upper; 2045 struct list_head lower; 2046 } adj_list; 2047 2048 /* Read-mostly cache-line for fast-path access */ 2049 unsigned int flags; 2050 unsigned long long priv_flags; 2051 const struct net_device_ops *netdev_ops; 2052 int ifindex; 2053 unsigned short gflags; 2054 unsigned short hard_header_len; 2055 2056 /* Note : dev->mtu is often read without holding a lock. 2057 * Writers usually hold RTNL. 2058 * It is recommended to use READ_ONCE() to annotate the reads, 2059 * and to use WRITE_ONCE() to annotate the writes. 2060 */ 2061 unsigned int mtu; 2062 unsigned short needed_headroom; 2063 unsigned short needed_tailroom; 2064 2065 netdev_features_t features; 2066 netdev_features_t hw_features; 2067 netdev_features_t wanted_features; 2068 netdev_features_t vlan_features; 2069 netdev_features_t hw_enc_features; 2070 netdev_features_t mpls_features; 2071 netdev_features_t gso_partial_features; 2072 2073 unsigned int min_mtu; 2074 unsigned int max_mtu; 2075 unsigned short type; 2076 unsigned char min_header_len; 2077 unsigned char name_assign_type; 2078 2079 int group; 2080 2081 struct net_device_stats stats; /* not used by modern drivers */ 2082 2083 struct net_device_core_stats __percpu *core_stats; 2084 2085 /* Stats to monitor link on/off, flapping */ 2086 atomic_t carrier_up_count; 2087 atomic_t carrier_down_count; 2088 2089 #ifdef CONFIG_WIRELESS_EXT 2090 const struct iw_handler_def *wireless_handlers; 2091 struct iw_public_data *wireless_data; 2092 #endif 2093 const struct ethtool_ops *ethtool_ops; 2094 #ifdef CONFIG_NET_L3_MASTER_DEV 2095 const struct l3mdev_ops *l3mdev_ops; 2096 #endif 2097 #if IS_ENABLED(CONFIG_IPV6) 2098 const struct ndisc_ops *ndisc_ops; 2099 #endif 2100 2101 #ifdef CONFIG_XFRM_OFFLOAD 2102 const struct xfrmdev_ops *xfrmdev_ops; 2103 #endif 2104 2105 #if IS_ENABLED(CONFIG_TLS_DEVICE) 2106 const struct tlsdev_ops *tlsdev_ops; 2107 #endif 2108 2109 const struct header_ops *header_ops; 2110 2111 unsigned char operstate; 2112 unsigned char link_mode; 2113 2114 unsigned char if_port; 2115 unsigned char dma; 2116 2117 /* Interface address info. */ 2118 unsigned char perm_addr[MAX_ADDR_LEN]; 2119 unsigned char addr_assign_type; 2120 unsigned char addr_len; 2121 unsigned char upper_level; 2122 unsigned char lower_level; 2123 2124 unsigned short neigh_priv_len; 2125 unsigned short dev_id; 2126 unsigned short dev_port; 2127 unsigned short padded; 2128 2129 spinlock_t addr_list_lock; 2130 int irq; 2131 2132 struct netdev_hw_addr_list uc; 2133 struct netdev_hw_addr_list mc; 2134 struct netdev_hw_addr_list dev_addrs; 2135 2136 #ifdef CONFIG_SYSFS 2137 struct kset *queues_kset; 2138 #endif 2139 #ifdef CONFIG_LOCKDEP 2140 struct list_head unlink_list; 2141 #endif 2142 unsigned int promiscuity; 2143 unsigned int allmulti; 2144 bool uc_promisc; 2145 #ifdef CONFIG_LOCKDEP 2146 unsigned char nested_level; 2147 #endif 2148 2149 2150 /* Protocol-specific pointers */ 2151 2152 struct in_device __rcu *ip_ptr; 2153 struct inet6_dev __rcu *ip6_ptr; 2154 #if IS_ENABLED(CONFIG_VLAN_8021Q) 2155 struct vlan_info __rcu *vlan_info; 2156 #endif 2157 #if IS_ENABLED(CONFIG_NET_DSA) 2158 struct dsa_port *dsa_ptr; 2159 #endif 2160 #if IS_ENABLED(CONFIG_TIPC) 2161 struct tipc_bearer __rcu *tipc_ptr; 2162 #endif 2163 #if IS_ENABLED(CONFIG_ATALK) 2164 void *atalk_ptr; 2165 #endif 2166 #if IS_ENABLED(CONFIG_AX25) 2167 void *ax25_ptr; 2168 #endif 2169 #if IS_ENABLED(CONFIG_CFG80211) 2170 struct wireless_dev *ieee80211_ptr; 2171 #endif 2172 #if IS_ENABLED(CONFIG_IEEE802154) || IS_ENABLED(CONFIG_6LOWPAN) 2173 struct wpan_dev *ieee802154_ptr; 2174 #endif 2175 #if IS_ENABLED(CONFIG_MPLS_ROUTING) 2176 struct mpls_dev __rcu *mpls_ptr; 2177 #endif 2178 #if IS_ENABLED(CONFIG_MCTP) 2179 struct mctp_dev __rcu *mctp_ptr; 2180 #endif 2181 2182 /* 2183 * Cache lines mostly used on receive path (including eth_type_trans()) 2184 */ 2185 /* Interface address info used in eth_type_trans() */ 2186 const unsigned char *dev_addr; 2187 2188 struct netdev_rx_queue *_rx; 2189 unsigned int num_rx_queues; 2190 unsigned int real_num_rx_queues; 2191 2192 struct bpf_prog __rcu *xdp_prog; 2193 unsigned long gro_flush_timeout; 2194 int napi_defer_hard_irqs; 2195 #define GRO_LEGACY_MAX_SIZE 65536u 2196 /* TCP minimal MSS is 8 (TCP_MIN_GSO_SIZE), 2197 * and shinfo->gso_segs is a 16bit field. 2198 */ 2199 #define GRO_MAX_SIZE (8 * 65535u) 2200 unsigned int gro_max_size; 2201 rx_handler_func_t __rcu *rx_handler; 2202 void __rcu *rx_handler_data; 2203 2204 #ifdef CONFIG_NET_CLS_ACT 2205 struct mini_Qdisc __rcu *miniq_ingress; 2206 #endif 2207 struct netdev_queue __rcu *ingress_queue; 2208 #ifdef CONFIG_NETFILTER_INGRESS 2209 struct nf_hook_entries __rcu *nf_hooks_ingress; 2210 #endif 2211 2212 unsigned char broadcast[MAX_ADDR_LEN]; 2213 #ifdef CONFIG_RFS_ACCEL 2214 struct cpu_rmap *rx_cpu_rmap; 2215 #endif 2216 struct hlist_node index_hlist; 2217 2218 /* 2219 * Cache lines mostly used on transmit path 2220 */ 2221 struct netdev_queue *_tx ____cacheline_aligned_in_smp; 2222 unsigned int num_tx_queues; 2223 unsigned int real_num_tx_queues; 2224 struct Qdisc __rcu *qdisc; 2225 unsigned int tx_queue_len; 2226 spinlock_t tx_global_lock; 2227 2228 struct xdp_dev_bulk_queue __percpu *xdp_bulkq; 2229 2230 #ifdef CONFIG_XPS 2231 struct xps_dev_maps __rcu *xps_maps[XPS_MAPS_MAX]; 2232 #endif 2233 #ifdef CONFIG_NET_CLS_ACT 2234 struct mini_Qdisc __rcu *miniq_egress; 2235 #endif 2236 #ifdef CONFIG_NETFILTER_EGRESS 2237 struct nf_hook_entries __rcu *nf_hooks_egress; 2238 #endif 2239 2240 #ifdef CONFIG_NET_SCHED 2241 DECLARE_HASHTABLE (qdisc_hash, 4); 2242 #endif 2243 /* These may be needed for future network-power-down code. */ 2244 struct timer_list watchdog_timer; 2245 int watchdog_timeo; 2246 2247 u32 proto_down_reason; 2248 2249 struct list_head todo_list; 2250 2251 #ifdef CONFIG_PCPU_DEV_REFCNT 2252 int __percpu *pcpu_refcnt; 2253 #else 2254 refcount_t dev_refcnt; 2255 #endif 2256 struct ref_tracker_dir refcnt_tracker; 2257 2258 struct list_head link_watch_list; 2259 2260 enum { NETREG_UNINITIALIZED=0, 2261 NETREG_REGISTERED, /* completed register_netdevice */ 2262 NETREG_UNREGISTERING, /* called unregister_netdevice */ 2263 NETREG_UNREGISTERED, /* completed unregister todo */ 2264 NETREG_RELEASED, /* called free_netdev */ 2265 NETREG_DUMMY, /* dummy device for NAPI poll */ 2266 } reg_state:8; 2267 2268 bool dismantle; 2269 2270 enum { 2271 RTNL_LINK_INITIALIZED, 2272 RTNL_LINK_INITIALIZING, 2273 } rtnl_link_state:16; 2274 2275 bool needs_free_netdev; 2276 void (*priv_destructor)(struct net_device *dev); 2277 2278 #ifdef CONFIG_NETPOLL 2279 struct netpoll_info __rcu *npinfo; 2280 #endif 2281 2282 possible_net_t nd_net; 2283 2284 /* mid-layer private */ 2285 void *ml_priv; 2286 enum netdev_ml_priv_type ml_priv_type; 2287 2288 union { 2289 struct pcpu_lstats __percpu *lstats; 2290 struct pcpu_sw_netstats __percpu *tstats; 2291 struct pcpu_dstats __percpu *dstats; 2292 }; 2293 2294 #if IS_ENABLED(CONFIG_GARP) 2295 struct garp_port __rcu *garp_port; 2296 #endif 2297 #if IS_ENABLED(CONFIG_MRP) 2298 struct mrp_port __rcu *mrp_port; 2299 #endif 2300 #if IS_ENABLED(CONFIG_NET_DROP_MONITOR) 2301 struct dm_hw_stat_delta __rcu *dm_private; 2302 #endif 2303 struct device dev; 2304 const struct attribute_group *sysfs_groups[4]; 2305 const struct attribute_group *sysfs_rx_queue_group; 2306 2307 const struct rtnl_link_ops *rtnl_link_ops; 2308 2309 /* for setting kernel sock attribute on TCP connection setup */ 2310 #define GSO_MAX_SEGS 65535u 2311 #define GSO_LEGACY_MAX_SIZE 65536u 2312 /* TCP minimal MSS is 8 (TCP_MIN_GSO_SIZE), 2313 * and shinfo->gso_segs is a 16bit field. 2314 */ 2315 #define GSO_MAX_SIZE (8 * GSO_MAX_SEGS) 2316 2317 unsigned int gso_max_size; 2318 #define TSO_LEGACY_MAX_SIZE 65536 2319 #define TSO_MAX_SIZE UINT_MAX 2320 unsigned int tso_max_size; 2321 u16 gso_max_segs; 2322 #define TSO_MAX_SEGS U16_MAX 2323 u16 tso_max_segs; 2324 2325 #ifdef CONFIG_DCB 2326 const struct dcbnl_rtnl_ops *dcbnl_ops; 2327 #endif 2328 s16 num_tc; 2329 struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE]; 2330 u8 prio_tc_map[TC_BITMASK + 1]; 2331 2332 #if IS_ENABLED(CONFIG_FCOE) 2333 unsigned int fcoe_ddp_xid; 2334 #endif 2335 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) 2336 struct netprio_map __rcu *priomap; 2337 #endif 2338 struct phy_device *phydev; 2339 struct sfp_bus *sfp_bus; 2340 struct lock_class_key *qdisc_tx_busylock; 2341 bool proto_down; 2342 unsigned wol_enabled:1; 2343 unsigned threaded:1; 2344 2345 struct list_head net_notifier_list; 2346 2347 #if IS_ENABLED(CONFIG_MACSEC) 2348 /* MACsec management functions */ 2349 const struct macsec_ops *macsec_ops; 2350 #endif 2351 const struct udp_tunnel_nic_info *udp_tunnel_nic_info; 2352 struct udp_tunnel_nic *udp_tunnel_nic; 2353 2354 /* protected by rtnl_lock */ 2355 struct bpf_xdp_entity xdp_state[__MAX_XDP_MODE]; 2356 2357 u8 dev_addr_shadow[MAX_ADDR_LEN]; 2358 netdevice_tracker linkwatch_dev_tracker; 2359 netdevice_tracker watchdog_dev_tracker; 2360 netdevice_tracker dev_registered_tracker; 2361 struct rtnl_hw_stats64 *offload_xstats_l3; 2362 2363 struct devlink_port *devlink_port; 2364 }; 2365 #define to_net_dev(d) container_of(d, struct net_device, dev) 2366 2367 /* 2368 * Driver should use this to assign devlink port instance to a netdevice 2369 * before it registers the netdevice. Therefore devlink_port is static 2370 * during the netdev lifetime after it is registered. 2371 */ 2372 #define SET_NETDEV_DEVLINK_PORT(dev, port) \ 2373 ({ \ 2374 WARN_ON((dev)->reg_state != NETREG_UNINITIALIZED); \ 2375 ((dev)->devlink_port = (port)); \ 2376 }) 2377 2378 static inline bool netif_elide_gro(const struct net_device *dev) 2379 { 2380 if (!(dev->features & NETIF_F_GRO) || dev->xdp_prog) 2381 return true; 2382 return false; 2383 } 2384 2385 #define NETDEV_ALIGN 32 2386 2387 static inline 2388 int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio) 2389 { 2390 return dev->prio_tc_map[prio & TC_BITMASK]; 2391 } 2392 2393 static inline 2394 int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc) 2395 { 2396 if (tc >= dev->num_tc) 2397 return -EINVAL; 2398 2399 dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK; 2400 return 0; 2401 } 2402 2403 int netdev_txq_to_tc(struct net_device *dev, unsigned int txq); 2404 void netdev_reset_tc(struct net_device *dev); 2405 int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset); 2406 int netdev_set_num_tc(struct net_device *dev, u8 num_tc); 2407 2408 static inline 2409 int netdev_get_num_tc(struct net_device *dev) 2410 { 2411 return dev->num_tc; 2412 } 2413 2414 static inline void net_prefetch(void *p) 2415 { 2416 prefetch(p); 2417 #if L1_CACHE_BYTES < 128 2418 prefetch((u8 *)p + L1_CACHE_BYTES); 2419 #endif 2420 } 2421 2422 static inline void net_prefetchw(void *p) 2423 { 2424 prefetchw(p); 2425 #if L1_CACHE_BYTES < 128 2426 prefetchw((u8 *)p + L1_CACHE_BYTES); 2427 #endif 2428 } 2429 2430 void netdev_unbind_sb_channel(struct net_device *dev, 2431 struct net_device *sb_dev); 2432 int netdev_bind_sb_channel_queue(struct net_device *dev, 2433 struct net_device *sb_dev, 2434 u8 tc, u16 count, u16 offset); 2435 int netdev_set_sb_channel(struct net_device *dev, u16 channel); 2436 static inline int netdev_get_sb_channel(struct net_device *dev) 2437 { 2438 return max_t(int, -dev->num_tc, 0); 2439 } 2440 2441 static inline 2442 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev, 2443 unsigned int index) 2444 { 2445 return &dev->_tx[index]; 2446 } 2447 2448 static inline struct netdev_queue *skb_get_tx_queue(const struct net_device *dev, 2449 const struct sk_buff *skb) 2450 { 2451 return netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); 2452 } 2453 2454 static inline void netdev_for_each_tx_queue(struct net_device *dev, 2455 void (*f)(struct net_device *, 2456 struct netdev_queue *, 2457 void *), 2458 void *arg) 2459 { 2460 unsigned int i; 2461 2462 for (i = 0; i < dev->num_tx_queues; i++) 2463 f(dev, &dev->_tx[i], arg); 2464 } 2465 2466 #define netdev_lockdep_set_classes(dev) \ 2467 { \ 2468 static struct lock_class_key qdisc_tx_busylock_key; \ 2469 static struct lock_class_key qdisc_xmit_lock_key; \ 2470 static struct lock_class_key dev_addr_list_lock_key; \ 2471 unsigned int i; \ 2472 \ 2473 (dev)->qdisc_tx_busylock = &qdisc_tx_busylock_key; \ 2474 lockdep_set_class(&(dev)->addr_list_lock, \ 2475 &dev_addr_list_lock_key); \ 2476 for (i = 0; i < (dev)->num_tx_queues; i++) \ 2477 lockdep_set_class(&(dev)->_tx[i]._xmit_lock, \ 2478 &qdisc_xmit_lock_key); \ 2479 } 2480 2481 u16 netdev_pick_tx(struct net_device *dev, struct sk_buff *skb, 2482 struct net_device *sb_dev); 2483 struct netdev_queue *netdev_core_pick_tx(struct net_device *dev, 2484 struct sk_buff *skb, 2485 struct net_device *sb_dev); 2486 2487 /* returns the headroom that the master device needs to take in account 2488 * when forwarding to this dev 2489 */ 2490 static inline unsigned netdev_get_fwd_headroom(struct net_device *dev) 2491 { 2492 return dev->priv_flags & IFF_PHONY_HEADROOM ? 0 : dev->needed_headroom; 2493 } 2494 2495 static inline void netdev_set_rx_headroom(struct net_device *dev, int new_hr) 2496 { 2497 if (dev->netdev_ops->ndo_set_rx_headroom) 2498 dev->netdev_ops->ndo_set_rx_headroom(dev, new_hr); 2499 } 2500 2501 /* set the device rx headroom to the dev's default */ 2502 static inline void netdev_reset_rx_headroom(struct net_device *dev) 2503 { 2504 netdev_set_rx_headroom(dev, -1); 2505 } 2506 2507 static inline void *netdev_get_ml_priv(struct net_device *dev, 2508 enum netdev_ml_priv_type type) 2509 { 2510 if (dev->ml_priv_type != type) 2511 return NULL; 2512 2513 return dev->ml_priv; 2514 } 2515 2516 static inline void netdev_set_ml_priv(struct net_device *dev, 2517 void *ml_priv, 2518 enum netdev_ml_priv_type type) 2519 { 2520 WARN(dev->ml_priv_type && dev->ml_priv_type != type, 2521 "Overwriting already set ml_priv_type (%u) with different ml_priv_type (%u)!\n", 2522 dev->ml_priv_type, type); 2523 WARN(!dev->ml_priv_type && dev->ml_priv, 2524 "Overwriting already set ml_priv and ml_priv_type is ML_PRIV_NONE!\n"); 2525 2526 dev->ml_priv = ml_priv; 2527 dev->ml_priv_type = type; 2528 } 2529 2530 /* 2531 * Net namespace inlines 2532 */ 2533 static inline 2534 struct net *dev_net(const struct net_device *dev) 2535 { 2536 return read_pnet(&dev->nd_net); 2537 } 2538 2539 static inline 2540 void dev_net_set(struct net_device *dev, struct net *net) 2541 { 2542 write_pnet(&dev->nd_net, net); 2543 } 2544 2545 /** 2546 * netdev_priv - access network device private data 2547 * @dev: network device 2548 * 2549 * Get network device private data 2550 */ 2551 static inline void *netdev_priv(const struct net_device *dev) 2552 { 2553 return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN); 2554 } 2555 2556 /* Set the sysfs physical device reference for the network logical device 2557 * if set prior to registration will cause a symlink during initialization. 2558 */ 2559 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) 2560 2561 /* Set the sysfs device type for the network logical device to allow 2562 * fine-grained identification of different network device types. For 2563 * example Ethernet, Wireless LAN, Bluetooth, WiMAX etc. 2564 */ 2565 #define SET_NETDEV_DEVTYPE(net, devtype) ((net)->dev.type = (devtype)) 2566 2567 /* Default NAPI poll() weight 2568 * Device drivers are strongly advised to not use bigger value 2569 */ 2570 #define NAPI_POLL_WEIGHT 64 2571 2572 void netif_napi_add_weight(struct net_device *dev, struct napi_struct *napi, 2573 int (*poll)(struct napi_struct *, int), int weight); 2574 2575 /** 2576 * netif_napi_add() - initialize a NAPI context 2577 * @dev: network device 2578 * @napi: NAPI context 2579 * @poll: polling function 2580 * 2581 * netif_napi_add() must be used to initialize a NAPI context prior to calling 2582 * *any* of the other NAPI-related functions. 2583 */ 2584 static inline void 2585 netif_napi_add(struct net_device *dev, struct napi_struct *napi, 2586 int (*poll)(struct napi_struct *, int)) 2587 { 2588 netif_napi_add_weight(dev, napi, poll, NAPI_POLL_WEIGHT); 2589 } 2590 2591 static inline void 2592 netif_napi_add_tx_weight(struct net_device *dev, 2593 struct napi_struct *napi, 2594 int (*poll)(struct napi_struct *, int), 2595 int weight) 2596 { 2597 set_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state); 2598 netif_napi_add_weight(dev, napi, poll, weight); 2599 } 2600 2601 /** 2602 * netif_napi_add_tx() - initialize a NAPI context to be used for Tx only 2603 * @dev: network device 2604 * @napi: NAPI context 2605 * @poll: polling function 2606 * 2607 * This variant of netif_napi_add() should be used from drivers using NAPI 2608 * to exclusively poll a TX queue. 2609 * This will avoid we add it into napi_hash[], thus polluting this hash table. 2610 */ 2611 static inline void netif_napi_add_tx(struct net_device *dev, 2612 struct napi_struct *napi, 2613 int (*poll)(struct napi_struct *, int)) 2614 { 2615 netif_napi_add_tx_weight(dev, napi, poll, NAPI_POLL_WEIGHT); 2616 } 2617 2618 /** 2619 * __netif_napi_del - remove a NAPI context 2620 * @napi: NAPI context 2621 * 2622 * Warning: caller must observe RCU grace period before freeing memory 2623 * containing @napi. Drivers might want to call this helper to combine 2624 * all the needed RCU grace periods into a single one. 2625 */ 2626 void __netif_napi_del(struct napi_struct *napi); 2627 2628 /** 2629 * netif_napi_del - remove a NAPI context 2630 * @napi: NAPI context 2631 * 2632 * netif_napi_del() removes a NAPI context from the network device NAPI list 2633 */ 2634 static inline void netif_napi_del(struct napi_struct *napi) 2635 { 2636 __netif_napi_del(napi); 2637 synchronize_net(); 2638 } 2639 2640 struct packet_type { 2641 __be16 type; /* This is really htons(ether_type). */ 2642 bool ignore_outgoing; 2643 struct net_device *dev; /* NULL is wildcarded here */ 2644 netdevice_tracker dev_tracker; 2645 int (*func) (struct sk_buff *, 2646 struct net_device *, 2647 struct packet_type *, 2648 struct net_device *); 2649 void (*list_func) (struct list_head *, 2650 struct packet_type *, 2651 struct net_device *); 2652 bool (*id_match)(struct packet_type *ptype, 2653 struct sock *sk); 2654 struct net *af_packet_net; 2655 void *af_packet_priv; 2656 struct list_head list; 2657 }; 2658 2659 struct offload_callbacks { 2660 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 2661 netdev_features_t features); 2662 struct sk_buff *(*gro_receive)(struct list_head *head, 2663 struct sk_buff *skb); 2664 int (*gro_complete)(struct sk_buff *skb, int nhoff); 2665 }; 2666 2667 struct packet_offload { 2668 __be16 type; /* This is really htons(ether_type). */ 2669 u16 priority; 2670 struct offload_callbacks callbacks; 2671 struct list_head list; 2672 }; 2673 2674 /* often modified stats are per-CPU, other are shared (netdev->stats) */ 2675 struct pcpu_sw_netstats { 2676 u64_stats_t rx_packets; 2677 u64_stats_t rx_bytes; 2678 u64_stats_t tx_packets; 2679 u64_stats_t tx_bytes; 2680 struct u64_stats_sync syncp; 2681 } __aligned(4 * sizeof(u64)); 2682 2683 struct pcpu_lstats { 2684 u64_stats_t packets; 2685 u64_stats_t bytes; 2686 struct u64_stats_sync syncp; 2687 } __aligned(2 * sizeof(u64)); 2688 2689 void dev_lstats_read(struct net_device *dev, u64 *packets, u64 *bytes); 2690 2691 static inline void dev_sw_netstats_rx_add(struct net_device *dev, unsigned int len) 2692 { 2693 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 2694 2695 u64_stats_update_begin(&tstats->syncp); 2696 u64_stats_add(&tstats->rx_bytes, len); 2697 u64_stats_inc(&tstats->rx_packets); 2698 u64_stats_update_end(&tstats->syncp); 2699 } 2700 2701 static inline void dev_sw_netstats_tx_add(struct net_device *dev, 2702 unsigned int packets, 2703 unsigned int len) 2704 { 2705 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 2706 2707 u64_stats_update_begin(&tstats->syncp); 2708 u64_stats_add(&tstats->tx_bytes, len); 2709 u64_stats_add(&tstats->tx_packets, packets); 2710 u64_stats_update_end(&tstats->syncp); 2711 } 2712 2713 static inline void dev_lstats_add(struct net_device *dev, unsigned int len) 2714 { 2715 struct pcpu_lstats *lstats = this_cpu_ptr(dev->lstats); 2716 2717 u64_stats_update_begin(&lstats->syncp); 2718 u64_stats_add(&lstats->bytes, len); 2719 u64_stats_inc(&lstats->packets); 2720 u64_stats_update_end(&lstats->syncp); 2721 } 2722 2723 #define __netdev_alloc_pcpu_stats(type, gfp) \ 2724 ({ \ 2725 typeof(type) __percpu *pcpu_stats = alloc_percpu_gfp(type, gfp);\ 2726 if (pcpu_stats) { \ 2727 int __cpu; \ 2728 for_each_possible_cpu(__cpu) { \ 2729 typeof(type) *stat; \ 2730 stat = per_cpu_ptr(pcpu_stats, __cpu); \ 2731 u64_stats_init(&stat->syncp); \ 2732 } \ 2733 } \ 2734 pcpu_stats; \ 2735 }) 2736 2737 #define netdev_alloc_pcpu_stats(type) \ 2738 __netdev_alloc_pcpu_stats(type, GFP_KERNEL) 2739 2740 #define devm_netdev_alloc_pcpu_stats(dev, type) \ 2741 ({ \ 2742 typeof(type) __percpu *pcpu_stats = devm_alloc_percpu(dev, type);\ 2743 if (pcpu_stats) { \ 2744 int __cpu; \ 2745 for_each_possible_cpu(__cpu) { \ 2746 typeof(type) *stat; \ 2747 stat = per_cpu_ptr(pcpu_stats, __cpu); \ 2748 u64_stats_init(&stat->syncp); \ 2749 } \ 2750 } \ 2751 pcpu_stats; \ 2752 }) 2753 2754 enum netdev_lag_tx_type { 2755 NETDEV_LAG_TX_TYPE_UNKNOWN, 2756 NETDEV_LAG_TX_TYPE_RANDOM, 2757 NETDEV_LAG_TX_TYPE_BROADCAST, 2758 NETDEV_LAG_TX_TYPE_ROUNDROBIN, 2759 NETDEV_LAG_TX_TYPE_ACTIVEBACKUP, 2760 NETDEV_LAG_TX_TYPE_HASH, 2761 }; 2762 2763 enum netdev_lag_hash { 2764 NETDEV_LAG_HASH_NONE, 2765 NETDEV_LAG_HASH_L2, 2766 NETDEV_LAG_HASH_L34, 2767 NETDEV_LAG_HASH_L23, 2768 NETDEV_LAG_HASH_E23, 2769 NETDEV_LAG_HASH_E34, 2770 NETDEV_LAG_HASH_VLAN_SRCMAC, 2771 NETDEV_LAG_HASH_UNKNOWN, 2772 }; 2773 2774 struct netdev_lag_upper_info { 2775 enum netdev_lag_tx_type tx_type; 2776 enum netdev_lag_hash hash_type; 2777 }; 2778 2779 struct netdev_lag_lower_state_info { 2780 u8 link_up : 1, 2781 tx_enabled : 1; 2782 }; 2783 2784 #include <linux/notifier.h> 2785 2786 /* netdevice notifier chain. Please remember to update netdev_cmd_to_name() 2787 * and the rtnetlink notification exclusion list in rtnetlink_event() when 2788 * adding new types. 2789 */ 2790 enum netdev_cmd { 2791 NETDEV_UP = 1, /* For now you can't veto a device up/down */ 2792 NETDEV_DOWN, 2793 NETDEV_REBOOT, /* Tell a protocol stack a network interface 2794 detected a hardware crash and restarted 2795 - we can use this eg to kick tcp sessions 2796 once done */ 2797 NETDEV_CHANGE, /* Notify device state change */ 2798 NETDEV_REGISTER, 2799 NETDEV_UNREGISTER, 2800 NETDEV_CHANGEMTU, /* notify after mtu change happened */ 2801 NETDEV_CHANGEADDR, /* notify after the address change */ 2802 NETDEV_PRE_CHANGEADDR, /* notify before the address change */ 2803 NETDEV_GOING_DOWN, 2804 NETDEV_CHANGENAME, 2805 NETDEV_FEAT_CHANGE, 2806 NETDEV_BONDING_FAILOVER, 2807 NETDEV_PRE_UP, 2808 NETDEV_PRE_TYPE_CHANGE, 2809 NETDEV_POST_TYPE_CHANGE, 2810 NETDEV_POST_INIT, 2811 NETDEV_PRE_UNINIT, 2812 NETDEV_RELEASE, 2813 NETDEV_NOTIFY_PEERS, 2814 NETDEV_JOIN, 2815 NETDEV_CHANGEUPPER, 2816 NETDEV_RESEND_IGMP, 2817 NETDEV_PRECHANGEMTU, /* notify before mtu change happened */ 2818 NETDEV_CHANGEINFODATA, 2819 NETDEV_BONDING_INFO, 2820 NETDEV_PRECHANGEUPPER, 2821 NETDEV_CHANGELOWERSTATE, 2822 NETDEV_UDP_TUNNEL_PUSH_INFO, 2823 NETDEV_UDP_TUNNEL_DROP_INFO, 2824 NETDEV_CHANGE_TX_QUEUE_LEN, 2825 NETDEV_CVLAN_FILTER_PUSH_INFO, 2826 NETDEV_CVLAN_FILTER_DROP_INFO, 2827 NETDEV_SVLAN_FILTER_PUSH_INFO, 2828 NETDEV_SVLAN_FILTER_DROP_INFO, 2829 NETDEV_OFFLOAD_XSTATS_ENABLE, 2830 NETDEV_OFFLOAD_XSTATS_DISABLE, 2831 NETDEV_OFFLOAD_XSTATS_REPORT_USED, 2832 NETDEV_OFFLOAD_XSTATS_REPORT_DELTA, 2833 }; 2834 const char *netdev_cmd_to_name(enum netdev_cmd cmd); 2835 2836 int register_netdevice_notifier(struct notifier_block *nb); 2837 int unregister_netdevice_notifier(struct notifier_block *nb); 2838 int register_netdevice_notifier_net(struct net *net, struct notifier_block *nb); 2839 int unregister_netdevice_notifier_net(struct net *net, 2840 struct notifier_block *nb); 2841 void move_netdevice_notifier_net(struct net *src_net, struct net *dst_net, 2842 struct notifier_block *nb); 2843 int register_netdevice_notifier_dev_net(struct net_device *dev, 2844 struct notifier_block *nb, 2845 struct netdev_net_notifier *nn); 2846 int unregister_netdevice_notifier_dev_net(struct net_device *dev, 2847 struct notifier_block *nb, 2848 struct netdev_net_notifier *nn); 2849 2850 struct netdev_notifier_info { 2851 struct net_device *dev; 2852 struct netlink_ext_ack *extack; 2853 }; 2854 2855 struct netdev_notifier_info_ext { 2856 struct netdev_notifier_info info; /* must be first */ 2857 union { 2858 u32 mtu; 2859 } ext; 2860 }; 2861 2862 struct netdev_notifier_change_info { 2863 struct netdev_notifier_info info; /* must be first */ 2864 unsigned int flags_changed; 2865 }; 2866 2867 struct netdev_notifier_changeupper_info { 2868 struct netdev_notifier_info info; /* must be first */ 2869 struct net_device *upper_dev; /* new upper dev */ 2870 bool master; /* is upper dev master */ 2871 bool linking; /* is the notification for link or unlink */ 2872 void *upper_info; /* upper dev info */ 2873 }; 2874 2875 struct netdev_notifier_changelowerstate_info { 2876 struct netdev_notifier_info info; /* must be first */ 2877 void *lower_state_info; /* is lower dev state */ 2878 }; 2879 2880 struct netdev_notifier_pre_changeaddr_info { 2881 struct netdev_notifier_info info; /* must be first */ 2882 const unsigned char *dev_addr; 2883 }; 2884 2885 enum netdev_offload_xstats_type { 2886 NETDEV_OFFLOAD_XSTATS_TYPE_L3 = 1, 2887 }; 2888 2889 struct netdev_notifier_offload_xstats_info { 2890 struct netdev_notifier_info info; /* must be first */ 2891 enum netdev_offload_xstats_type type; 2892 2893 union { 2894 /* NETDEV_OFFLOAD_XSTATS_REPORT_DELTA */ 2895 struct netdev_notifier_offload_xstats_rd *report_delta; 2896 /* NETDEV_OFFLOAD_XSTATS_REPORT_USED */ 2897 struct netdev_notifier_offload_xstats_ru *report_used; 2898 }; 2899 }; 2900 2901 int netdev_offload_xstats_enable(struct net_device *dev, 2902 enum netdev_offload_xstats_type type, 2903 struct netlink_ext_ack *extack); 2904 int netdev_offload_xstats_disable(struct net_device *dev, 2905 enum netdev_offload_xstats_type type); 2906 bool netdev_offload_xstats_enabled(const struct net_device *dev, 2907 enum netdev_offload_xstats_type type); 2908 int netdev_offload_xstats_get(struct net_device *dev, 2909 enum netdev_offload_xstats_type type, 2910 struct rtnl_hw_stats64 *stats, bool *used, 2911 struct netlink_ext_ack *extack); 2912 void 2913 netdev_offload_xstats_report_delta(struct netdev_notifier_offload_xstats_rd *rd, 2914 const struct rtnl_hw_stats64 *stats); 2915 void 2916 netdev_offload_xstats_report_used(struct netdev_notifier_offload_xstats_ru *ru); 2917 void netdev_offload_xstats_push_delta(struct net_device *dev, 2918 enum netdev_offload_xstats_type type, 2919 const struct rtnl_hw_stats64 *stats); 2920 2921 static inline void netdev_notifier_info_init(struct netdev_notifier_info *info, 2922 struct net_device *dev) 2923 { 2924 info->dev = dev; 2925 info->extack = NULL; 2926 } 2927 2928 static inline struct net_device * 2929 netdev_notifier_info_to_dev(const struct netdev_notifier_info *info) 2930 { 2931 return info->dev; 2932 } 2933 2934 static inline struct netlink_ext_ack * 2935 netdev_notifier_info_to_extack(const struct netdev_notifier_info *info) 2936 { 2937 return info->extack; 2938 } 2939 2940 int call_netdevice_notifiers(unsigned long val, struct net_device *dev); 2941 2942 2943 extern rwlock_t dev_base_lock; /* Device list lock */ 2944 2945 #define for_each_netdev(net, d) \ 2946 list_for_each_entry(d, &(net)->dev_base_head, dev_list) 2947 #define for_each_netdev_reverse(net, d) \ 2948 list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list) 2949 #define for_each_netdev_rcu(net, d) \ 2950 list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list) 2951 #define for_each_netdev_safe(net, d, n) \ 2952 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list) 2953 #define for_each_netdev_continue(net, d) \ 2954 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list) 2955 #define for_each_netdev_continue_reverse(net, d) \ 2956 list_for_each_entry_continue_reverse(d, &(net)->dev_base_head, \ 2957 dev_list) 2958 #define for_each_netdev_continue_rcu(net, d) \ 2959 list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list) 2960 #define for_each_netdev_in_bond_rcu(bond, slave) \ 2961 for_each_netdev_rcu(&init_net, slave) \ 2962 if (netdev_master_upper_dev_get_rcu(slave) == (bond)) 2963 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) 2964 2965 static inline struct net_device *next_net_device(struct net_device *dev) 2966 { 2967 struct list_head *lh; 2968 struct net *net; 2969 2970 net = dev_net(dev); 2971 lh = dev->dev_list.next; 2972 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 2973 } 2974 2975 static inline struct net_device *next_net_device_rcu(struct net_device *dev) 2976 { 2977 struct list_head *lh; 2978 struct net *net; 2979 2980 net = dev_net(dev); 2981 lh = rcu_dereference(list_next_rcu(&dev->dev_list)); 2982 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 2983 } 2984 2985 static inline struct net_device *first_net_device(struct net *net) 2986 { 2987 return list_empty(&net->dev_base_head) ? NULL : 2988 net_device_entry(net->dev_base_head.next); 2989 } 2990 2991 static inline struct net_device *first_net_device_rcu(struct net *net) 2992 { 2993 struct list_head *lh = rcu_dereference(list_next_rcu(&net->dev_base_head)); 2994 2995 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 2996 } 2997 2998 int netdev_boot_setup_check(struct net_device *dev); 2999 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, 3000 const char *hwaddr); 3001 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type); 3002 void dev_add_pack(struct packet_type *pt); 3003 void dev_remove_pack(struct packet_type *pt); 3004 void __dev_remove_pack(struct packet_type *pt); 3005 void dev_add_offload(struct packet_offload *po); 3006 void dev_remove_offload(struct packet_offload *po); 3007 3008 int dev_get_iflink(const struct net_device *dev); 3009 int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb); 3010 int dev_fill_forward_path(const struct net_device *dev, const u8 *daddr, 3011 struct net_device_path_stack *stack); 3012 struct net_device *__dev_get_by_flags(struct net *net, unsigned short flags, 3013 unsigned short mask); 3014 struct net_device *dev_get_by_name(struct net *net, const char *name); 3015 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name); 3016 struct net_device *__dev_get_by_name(struct net *net, const char *name); 3017 bool netdev_name_in_use(struct net *net, const char *name); 3018 int dev_alloc_name(struct net_device *dev, const char *name); 3019 int dev_open(struct net_device *dev, struct netlink_ext_ack *extack); 3020 void dev_close(struct net_device *dev); 3021 void dev_close_many(struct list_head *head, bool unlink); 3022 void dev_disable_lro(struct net_device *dev); 3023 int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *newskb); 3024 u16 dev_pick_tx_zero(struct net_device *dev, struct sk_buff *skb, 3025 struct net_device *sb_dev); 3026 u16 dev_pick_tx_cpu_id(struct net_device *dev, struct sk_buff *skb, 3027 struct net_device *sb_dev); 3028 3029 int __dev_queue_xmit(struct sk_buff *skb, struct net_device *sb_dev); 3030 int __dev_direct_xmit(struct sk_buff *skb, u16 queue_id); 3031 3032 static inline int dev_queue_xmit(struct sk_buff *skb) 3033 { 3034 return __dev_queue_xmit(skb, NULL); 3035 } 3036 3037 static inline int dev_queue_xmit_accel(struct sk_buff *skb, 3038 struct net_device *sb_dev) 3039 { 3040 return __dev_queue_xmit(skb, sb_dev); 3041 } 3042 3043 static inline int dev_direct_xmit(struct sk_buff *skb, u16 queue_id) 3044 { 3045 int ret; 3046 3047 ret = __dev_direct_xmit(skb, queue_id); 3048 if (!dev_xmit_complete(ret)) 3049 kfree_skb(skb); 3050 return ret; 3051 } 3052 3053 int register_netdevice(struct net_device *dev); 3054 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head); 3055 void unregister_netdevice_many(struct list_head *head); 3056 static inline void unregister_netdevice(struct net_device *dev) 3057 { 3058 unregister_netdevice_queue(dev, NULL); 3059 } 3060 3061 int netdev_refcnt_read(const struct net_device *dev); 3062 void free_netdev(struct net_device *dev); 3063 void netdev_freemem(struct net_device *dev); 3064 int init_dummy_netdev(struct net_device *dev); 3065 3066 struct net_device *netdev_get_xmit_slave(struct net_device *dev, 3067 struct sk_buff *skb, 3068 bool all_slaves); 3069 struct net_device *netdev_sk_get_lowest_dev(struct net_device *dev, 3070 struct sock *sk); 3071 struct net_device *dev_get_by_index(struct net *net, int ifindex); 3072 struct net_device *__dev_get_by_index(struct net *net, int ifindex); 3073 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex); 3074 struct net_device *dev_get_by_napi_id(unsigned int napi_id); 3075 int dev_restart(struct net_device *dev); 3076 3077 3078 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, 3079 unsigned short type, 3080 const void *daddr, const void *saddr, 3081 unsigned int len) 3082 { 3083 if (!dev->header_ops || !dev->header_ops->create) 3084 return 0; 3085 3086 return dev->header_ops->create(skb, dev, type, daddr, saddr, len); 3087 } 3088 3089 static inline int dev_parse_header(const struct sk_buff *skb, 3090 unsigned char *haddr) 3091 { 3092 const struct net_device *dev = skb->dev; 3093 3094 if (!dev->header_ops || !dev->header_ops->parse) 3095 return 0; 3096 return dev->header_ops->parse(skb, haddr); 3097 } 3098 3099 static inline __be16 dev_parse_header_protocol(const struct sk_buff *skb) 3100 { 3101 const struct net_device *dev = skb->dev; 3102 3103 if (!dev->header_ops || !dev->header_ops->parse_protocol) 3104 return 0; 3105 return dev->header_ops->parse_protocol(skb); 3106 } 3107 3108 /* ll_header must have at least hard_header_len allocated */ 3109 static inline bool dev_validate_header(const struct net_device *dev, 3110 char *ll_header, int len) 3111 { 3112 if (likely(len >= dev->hard_header_len)) 3113 return true; 3114 if (len < dev->min_header_len) 3115 return false; 3116 3117 if (capable(CAP_SYS_RAWIO)) { 3118 memset(ll_header + len, 0, dev->hard_header_len - len); 3119 return true; 3120 } 3121 3122 if (dev->header_ops && dev->header_ops->validate) 3123 return dev->header_ops->validate(ll_header, len); 3124 3125 return false; 3126 } 3127 3128 static inline bool dev_has_header(const struct net_device *dev) 3129 { 3130 return dev->header_ops && dev->header_ops->create; 3131 } 3132 3133 /* 3134 * Incoming packets are placed on per-CPU queues 3135 */ 3136 struct softnet_data { 3137 struct list_head poll_list; 3138 struct sk_buff_head process_queue; 3139 3140 /* stats */ 3141 unsigned int processed; 3142 unsigned int time_squeeze; 3143 #ifdef CONFIG_RPS 3144 struct softnet_data *rps_ipi_list; 3145 #endif 3146 #ifdef CONFIG_NET_FLOW_LIMIT 3147 struct sd_flow_limit __rcu *flow_limit; 3148 #endif 3149 struct Qdisc *output_queue; 3150 struct Qdisc **output_queue_tailp; 3151 struct sk_buff *completion_queue; 3152 #ifdef CONFIG_XFRM_OFFLOAD 3153 struct sk_buff_head xfrm_backlog; 3154 #endif 3155 /* written and read only by owning cpu: */ 3156 struct { 3157 u16 recursion; 3158 u8 more; 3159 #ifdef CONFIG_NET_EGRESS 3160 u8 skip_txqueue; 3161 #endif 3162 } xmit; 3163 #ifdef CONFIG_RPS 3164 /* input_queue_head should be written by cpu owning this struct, 3165 * and only read by other cpus. Worth using a cache line. 3166 */ 3167 unsigned int input_queue_head ____cacheline_aligned_in_smp; 3168 3169 /* Elements below can be accessed between CPUs for RPS/RFS */ 3170 call_single_data_t csd ____cacheline_aligned_in_smp; 3171 struct softnet_data *rps_ipi_next; 3172 unsigned int cpu; 3173 unsigned int input_queue_tail; 3174 #endif 3175 unsigned int received_rps; 3176 unsigned int dropped; 3177 struct sk_buff_head input_pkt_queue; 3178 struct napi_struct backlog; 3179 3180 /* Another possibly contended cache line */ 3181 spinlock_t defer_lock ____cacheline_aligned_in_smp; 3182 int defer_count; 3183 int defer_ipi_scheduled; 3184 struct sk_buff *defer_list; 3185 call_single_data_t defer_csd; 3186 }; 3187 3188 static inline void input_queue_head_incr(struct softnet_data *sd) 3189 { 3190 #ifdef CONFIG_RPS 3191 sd->input_queue_head++; 3192 #endif 3193 } 3194 3195 static inline void input_queue_tail_incr_save(struct softnet_data *sd, 3196 unsigned int *qtail) 3197 { 3198 #ifdef CONFIG_RPS 3199 *qtail = ++sd->input_queue_tail; 3200 #endif 3201 } 3202 3203 DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); 3204 3205 static inline int dev_recursion_level(void) 3206 { 3207 return this_cpu_read(softnet_data.xmit.recursion); 3208 } 3209 3210 #define XMIT_RECURSION_LIMIT 8 3211 static inline bool dev_xmit_recursion(void) 3212 { 3213 return unlikely(__this_cpu_read(softnet_data.xmit.recursion) > 3214 XMIT_RECURSION_LIMIT); 3215 } 3216 3217 static inline void dev_xmit_recursion_inc(void) 3218 { 3219 __this_cpu_inc(softnet_data.xmit.recursion); 3220 } 3221 3222 static inline void dev_xmit_recursion_dec(void) 3223 { 3224 __this_cpu_dec(softnet_data.xmit.recursion); 3225 } 3226 3227 void __netif_schedule(struct Qdisc *q); 3228 void netif_schedule_queue(struct netdev_queue *txq); 3229 3230 static inline void netif_tx_schedule_all(struct net_device *dev) 3231 { 3232 unsigned int i; 3233 3234 for (i = 0; i < dev->num_tx_queues; i++) 3235 netif_schedule_queue(netdev_get_tx_queue(dev, i)); 3236 } 3237 3238 static __always_inline void netif_tx_start_queue(struct netdev_queue *dev_queue) 3239 { 3240 clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state); 3241 } 3242 3243 /** 3244 * netif_start_queue - allow transmit 3245 * @dev: network device 3246 * 3247 * Allow upper layers to call the device hard_start_xmit routine. 3248 */ 3249 static inline void netif_start_queue(struct net_device *dev) 3250 { 3251 netif_tx_start_queue(netdev_get_tx_queue(dev, 0)); 3252 } 3253 3254 static inline void netif_tx_start_all_queues(struct net_device *dev) 3255 { 3256 unsigned int i; 3257 3258 for (i = 0; i < dev->num_tx_queues; i++) { 3259 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 3260 netif_tx_start_queue(txq); 3261 } 3262 } 3263 3264 void netif_tx_wake_queue(struct netdev_queue *dev_queue); 3265 3266 /** 3267 * netif_wake_queue - restart transmit 3268 * @dev: network device 3269 * 3270 * Allow upper layers to call the device hard_start_xmit routine. 3271 * Used for flow control when transmit resources are available. 3272 */ 3273 static inline void netif_wake_queue(struct net_device *dev) 3274 { 3275 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0)); 3276 } 3277 3278 static inline void netif_tx_wake_all_queues(struct net_device *dev) 3279 { 3280 unsigned int i; 3281 3282 for (i = 0; i < dev->num_tx_queues; i++) { 3283 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 3284 netif_tx_wake_queue(txq); 3285 } 3286 } 3287 3288 static __always_inline void netif_tx_stop_queue(struct netdev_queue *dev_queue) 3289 { 3290 set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state); 3291 } 3292 3293 /** 3294 * netif_stop_queue - stop transmitted packets 3295 * @dev: network device 3296 * 3297 * Stop upper layers calling the device hard_start_xmit routine. 3298 * Used for flow control when transmit resources are unavailable. 3299 */ 3300 static inline void netif_stop_queue(struct net_device *dev) 3301 { 3302 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0)); 3303 } 3304 3305 void netif_tx_stop_all_queues(struct net_device *dev); 3306 3307 static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue) 3308 { 3309 return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state); 3310 } 3311 3312 /** 3313 * netif_queue_stopped - test if transmit queue is flowblocked 3314 * @dev: network device 3315 * 3316 * Test if transmit queue on device is currently unable to send. 3317 */ 3318 static inline bool netif_queue_stopped(const struct net_device *dev) 3319 { 3320 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0)); 3321 } 3322 3323 static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue) 3324 { 3325 return dev_queue->state & QUEUE_STATE_ANY_XOFF; 3326 } 3327 3328 static inline bool 3329 netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue) 3330 { 3331 return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN; 3332 } 3333 3334 static inline bool 3335 netif_xmit_frozen_or_drv_stopped(const struct netdev_queue *dev_queue) 3336 { 3337 return dev_queue->state & QUEUE_STATE_DRV_XOFF_OR_FROZEN; 3338 } 3339 3340 /** 3341 * netdev_queue_set_dql_min_limit - set dql minimum limit 3342 * @dev_queue: pointer to transmit queue 3343 * @min_limit: dql minimum limit 3344 * 3345 * Forces xmit_more() to return true until the minimum threshold 3346 * defined by @min_limit is reached (or until the tx queue is 3347 * empty). Warning: to be use with care, misuse will impact the 3348 * latency. 3349 */ 3350 static inline void netdev_queue_set_dql_min_limit(struct netdev_queue *dev_queue, 3351 unsigned int min_limit) 3352 { 3353 #ifdef CONFIG_BQL 3354 dev_queue->dql.min_limit = min_limit; 3355 #endif 3356 } 3357 3358 /** 3359 * netdev_txq_bql_enqueue_prefetchw - prefetch bql data for write 3360 * @dev_queue: pointer to transmit queue 3361 * 3362 * BQL enabled drivers might use this helper in their ndo_start_xmit(), 3363 * to give appropriate hint to the CPU. 3364 */ 3365 static inline void netdev_txq_bql_enqueue_prefetchw(struct netdev_queue *dev_queue) 3366 { 3367 #ifdef CONFIG_BQL 3368 prefetchw(&dev_queue->dql.num_queued); 3369 #endif 3370 } 3371 3372 /** 3373 * netdev_txq_bql_complete_prefetchw - prefetch bql data for write 3374 * @dev_queue: pointer to transmit queue 3375 * 3376 * BQL enabled drivers might use this helper in their TX completion path, 3377 * to give appropriate hint to the CPU. 3378 */ 3379 static inline void netdev_txq_bql_complete_prefetchw(struct netdev_queue *dev_queue) 3380 { 3381 #ifdef CONFIG_BQL 3382 prefetchw(&dev_queue->dql.limit); 3383 #endif 3384 } 3385 3386 /** 3387 * netdev_tx_sent_queue - report the number of bytes queued to a given tx queue 3388 * @dev_queue: network device queue 3389 * @bytes: number of bytes queued to the device queue 3390 * 3391 * Report the number of bytes queued for sending/completion to the network 3392 * device hardware queue. @bytes should be a good approximation and should 3393 * exactly match netdev_completed_queue() @bytes. 3394 * This is typically called once per packet, from ndo_start_xmit(). 3395 */ 3396 static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue, 3397 unsigned int bytes) 3398 { 3399 #ifdef CONFIG_BQL 3400 dql_queued(&dev_queue->dql, bytes); 3401 3402 if (likely(dql_avail(&dev_queue->dql) >= 0)) 3403 return; 3404 3405 set_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state); 3406 3407 /* 3408 * The XOFF flag must be set before checking the dql_avail below, 3409 * because in netdev_tx_completed_queue we update the dql_completed 3410 * before checking the XOFF flag. 3411 */ 3412 smp_mb(); 3413 3414 /* check again in case another CPU has just made room avail */ 3415 if (unlikely(dql_avail(&dev_queue->dql) >= 0)) 3416 clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state); 3417 #endif 3418 } 3419 3420 /* Variant of netdev_tx_sent_queue() for drivers that are aware 3421 * that they should not test BQL status themselves. 3422 * We do want to change __QUEUE_STATE_STACK_XOFF only for the last 3423 * skb of a batch. 3424 * Returns true if the doorbell must be used to kick the NIC. 3425 */ 3426 static inline bool __netdev_tx_sent_queue(struct netdev_queue *dev_queue, 3427 unsigned int bytes, 3428 bool xmit_more) 3429 { 3430 if (xmit_more) { 3431 #ifdef CONFIG_BQL 3432 dql_queued(&dev_queue->dql, bytes); 3433 #endif 3434 return netif_tx_queue_stopped(dev_queue); 3435 } 3436 netdev_tx_sent_queue(dev_queue, bytes); 3437 return true; 3438 } 3439 3440 /** 3441 * netdev_sent_queue - report the number of bytes queued to hardware 3442 * @dev: network device 3443 * @bytes: number of bytes queued to the hardware device queue 3444 * 3445 * Report the number of bytes queued for sending/completion to the network 3446 * device hardware queue#0. @bytes should be a good approximation and should 3447 * exactly match netdev_completed_queue() @bytes. 3448 * This is typically called once per packet, from ndo_start_xmit(). 3449 */ 3450 static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes) 3451 { 3452 netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes); 3453 } 3454 3455 static inline bool __netdev_sent_queue(struct net_device *dev, 3456 unsigned int bytes, 3457 bool xmit_more) 3458 { 3459 return __netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes, 3460 xmit_more); 3461 } 3462 3463 /** 3464 * netdev_tx_completed_queue - report number of packets/bytes at TX completion. 3465 * @dev_queue: network device queue 3466 * @pkts: number of packets (currently ignored) 3467 * @bytes: number of bytes dequeued from the device queue 3468 * 3469 * Must be called at most once per TX completion round (and not per 3470 * individual packet), so that BQL can adjust its limits appropriately. 3471 */ 3472 static inline void netdev_tx_completed_queue(struct netdev_queue *dev_queue, 3473 unsigned int pkts, unsigned int bytes) 3474 { 3475 #ifdef CONFIG_BQL 3476 if (unlikely(!bytes)) 3477 return; 3478 3479 dql_completed(&dev_queue->dql, bytes); 3480 3481 /* 3482 * Without the memory barrier there is a small possiblity that 3483 * netdev_tx_sent_queue will miss the update and cause the queue to 3484 * be stopped forever 3485 */ 3486 smp_mb(); 3487 3488 if (unlikely(dql_avail(&dev_queue->dql) < 0)) 3489 return; 3490 3491 if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state)) 3492 netif_schedule_queue(dev_queue); 3493 #endif 3494 } 3495 3496 /** 3497 * netdev_completed_queue - report bytes and packets completed by device 3498 * @dev: network device 3499 * @pkts: actual number of packets sent over the medium 3500 * @bytes: actual number of bytes sent over the medium 3501 * 3502 * Report the number of bytes and packets transmitted by the network device 3503 * hardware queue over the physical medium, @bytes must exactly match the 3504 * @bytes amount passed to netdev_sent_queue() 3505 */ 3506 static inline void netdev_completed_queue(struct net_device *dev, 3507 unsigned int pkts, unsigned int bytes) 3508 { 3509 netdev_tx_completed_queue(netdev_get_tx_queue(dev, 0), pkts, bytes); 3510 } 3511 3512 static inline void netdev_tx_reset_queue(struct netdev_queue *q) 3513 { 3514 #ifdef CONFIG_BQL 3515 clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state); 3516 dql_reset(&q->dql); 3517 #endif 3518 } 3519 3520 /** 3521 * netdev_reset_queue - reset the packets and bytes count of a network device 3522 * @dev_queue: network device 3523 * 3524 * Reset the bytes and packet count of a network device and clear the 3525 * software flow control OFF bit for this network device 3526 */ 3527 static inline void netdev_reset_queue(struct net_device *dev_queue) 3528 { 3529 netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0)); 3530 } 3531 3532 /** 3533 * netdev_cap_txqueue - check if selected tx queue exceeds device queues 3534 * @dev: network device 3535 * @queue_index: given tx queue index 3536 * 3537 * Returns 0 if given tx queue index >= number of device tx queues, 3538 * otherwise returns the originally passed tx queue index. 3539 */ 3540 static inline u16 netdev_cap_txqueue(struct net_device *dev, u16 queue_index) 3541 { 3542 if (unlikely(queue_index >= dev->real_num_tx_queues)) { 3543 net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n", 3544 dev->name, queue_index, 3545 dev->real_num_tx_queues); 3546 return 0; 3547 } 3548 3549 return queue_index; 3550 } 3551 3552 /** 3553 * netif_running - test if up 3554 * @dev: network device 3555 * 3556 * Test if the device has been brought up. 3557 */ 3558 static inline bool netif_running(const struct net_device *dev) 3559 { 3560 return test_bit(__LINK_STATE_START, &dev->state); 3561 } 3562 3563 /* 3564 * Routines to manage the subqueues on a device. We only need start, 3565 * stop, and a check if it's stopped. All other device management is 3566 * done at the overall netdevice level. 3567 * Also test the device if we're multiqueue. 3568 */ 3569 3570 /** 3571 * netif_start_subqueue - allow sending packets on subqueue 3572 * @dev: network device 3573 * @queue_index: sub queue index 3574 * 3575 * Start individual transmit queue of a device with multiple transmit queues. 3576 */ 3577 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 3578 { 3579 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 3580 3581 netif_tx_start_queue(txq); 3582 } 3583 3584 /** 3585 * netif_stop_subqueue - stop sending packets on subqueue 3586 * @dev: network device 3587 * @queue_index: sub queue index 3588 * 3589 * Stop individual transmit queue of a device with multiple transmit queues. 3590 */ 3591 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 3592 { 3593 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 3594 netif_tx_stop_queue(txq); 3595 } 3596 3597 /** 3598 * __netif_subqueue_stopped - test status of subqueue 3599 * @dev: network device 3600 * @queue_index: sub queue index 3601 * 3602 * Check individual transmit queue of a device with multiple transmit queues. 3603 */ 3604 static inline bool __netif_subqueue_stopped(const struct net_device *dev, 3605 u16 queue_index) 3606 { 3607 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 3608 3609 return netif_tx_queue_stopped(txq); 3610 } 3611 3612 /** 3613 * netif_subqueue_stopped - test status of subqueue 3614 * @dev: network device 3615 * @skb: sub queue buffer pointer 3616 * 3617 * Check individual transmit queue of a device with multiple transmit queues. 3618 */ 3619 static inline bool netif_subqueue_stopped(const struct net_device *dev, 3620 struct sk_buff *skb) 3621 { 3622 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb)); 3623 } 3624 3625 /** 3626 * netif_wake_subqueue - allow sending packets on subqueue 3627 * @dev: network device 3628 * @queue_index: sub queue index 3629 * 3630 * Resume individual transmit queue of a device with multiple transmit queues. 3631 */ 3632 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 3633 { 3634 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 3635 3636 netif_tx_wake_queue(txq); 3637 } 3638 3639 #ifdef CONFIG_XPS 3640 int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask, 3641 u16 index); 3642 int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask, 3643 u16 index, enum xps_map_type type); 3644 3645 /** 3646 * netif_attr_test_mask - Test a CPU or Rx queue set in a mask 3647 * @j: CPU/Rx queue index 3648 * @mask: bitmask of all cpus/rx queues 3649 * @nr_bits: number of bits in the bitmask 3650 * 3651 * Test if a CPU or Rx queue index is set in a mask of all CPU/Rx queues. 3652 */ 3653 static inline bool netif_attr_test_mask(unsigned long j, 3654 const unsigned long *mask, 3655 unsigned int nr_bits) 3656 { 3657 cpu_max_bits_warn(j, nr_bits); 3658 return test_bit(j, mask); 3659 } 3660 3661 /** 3662 * netif_attr_test_online - Test for online CPU/Rx queue 3663 * @j: CPU/Rx queue index 3664 * @online_mask: bitmask for CPUs/Rx queues that are online 3665 * @nr_bits: number of bits in the bitmask 3666 * 3667 * Returns true if a CPU/Rx queue is online. 3668 */ 3669 static inline bool netif_attr_test_online(unsigned long j, 3670 const unsigned long *online_mask, 3671 unsigned int nr_bits) 3672 { 3673 cpu_max_bits_warn(j, nr_bits); 3674 3675 if (online_mask) 3676 return test_bit(j, online_mask); 3677 3678 return (j < nr_bits); 3679 } 3680 3681 /** 3682 * netif_attrmask_next - get the next CPU/Rx queue in a cpu/Rx queues mask 3683 * @n: CPU/Rx queue index 3684 * @srcp: the cpumask/Rx queue mask pointer 3685 * @nr_bits: number of bits in the bitmask 3686 * 3687 * Returns >= nr_bits if no further CPUs/Rx queues set. 3688 */ 3689 static inline unsigned int netif_attrmask_next(int n, const unsigned long *srcp, 3690 unsigned int nr_bits) 3691 { 3692 /* -1 is a legal arg here. */ 3693 if (n != -1) 3694 cpu_max_bits_warn(n, nr_bits); 3695 3696 if (srcp) 3697 return find_next_bit(srcp, nr_bits, n + 1); 3698 3699 return n + 1; 3700 } 3701 3702 /** 3703 * netif_attrmask_next_and - get the next CPU/Rx queue in \*src1p & \*src2p 3704 * @n: CPU/Rx queue index 3705 * @src1p: the first CPUs/Rx queues mask pointer 3706 * @src2p: the second CPUs/Rx queues mask pointer 3707 * @nr_bits: number of bits in the bitmask 3708 * 3709 * Returns >= nr_bits if no further CPUs/Rx queues set in both. 3710 */ 3711 static inline int netif_attrmask_next_and(int n, const unsigned long *src1p, 3712 const unsigned long *src2p, 3713 unsigned int nr_bits) 3714 { 3715 /* -1 is a legal arg here. */ 3716 if (n != -1) 3717 cpu_max_bits_warn(n, nr_bits); 3718 3719 if (src1p && src2p) 3720 return find_next_and_bit(src1p, src2p, nr_bits, n + 1); 3721 else if (src1p) 3722 return find_next_bit(src1p, nr_bits, n + 1); 3723 else if (src2p) 3724 return find_next_bit(src2p, nr_bits, n + 1); 3725 3726 return n + 1; 3727 } 3728 #else 3729 static inline int netif_set_xps_queue(struct net_device *dev, 3730 const struct cpumask *mask, 3731 u16 index) 3732 { 3733 return 0; 3734 } 3735 3736 static inline int __netif_set_xps_queue(struct net_device *dev, 3737 const unsigned long *mask, 3738 u16 index, enum xps_map_type type) 3739 { 3740 return 0; 3741 } 3742 #endif 3743 3744 /** 3745 * netif_is_multiqueue - test if device has multiple transmit queues 3746 * @dev: network device 3747 * 3748 * Check if device has multiple transmit queues 3749 */ 3750 static inline bool netif_is_multiqueue(const struct net_device *dev) 3751 { 3752 return dev->num_tx_queues > 1; 3753 } 3754 3755 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq); 3756 3757 #ifdef CONFIG_SYSFS 3758 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq); 3759 #else 3760 static inline int netif_set_real_num_rx_queues(struct net_device *dev, 3761 unsigned int rxqs) 3762 { 3763 dev->real_num_rx_queues = rxqs; 3764 return 0; 3765 } 3766 #endif 3767 int netif_set_real_num_queues(struct net_device *dev, 3768 unsigned int txq, unsigned int rxq); 3769 3770 static inline struct netdev_rx_queue * 3771 __netif_get_rx_queue(struct net_device *dev, unsigned int rxq) 3772 { 3773 return dev->_rx + rxq; 3774 } 3775 3776 #ifdef CONFIG_SYSFS 3777 static inline unsigned int get_netdev_rx_queue_index( 3778 struct netdev_rx_queue *queue) 3779 { 3780 struct net_device *dev = queue->dev; 3781 int index = queue - dev->_rx; 3782 3783 BUG_ON(index >= dev->num_rx_queues); 3784 return index; 3785 } 3786 #endif 3787 3788 int netif_get_num_default_rss_queues(void); 3789 3790 enum skb_free_reason { 3791 SKB_REASON_CONSUMED, 3792 SKB_REASON_DROPPED, 3793 }; 3794 3795 void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason); 3796 void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason); 3797 3798 /* 3799 * It is not allowed to call kfree_skb() or consume_skb() from hardware 3800 * interrupt context or with hardware interrupts being disabled. 3801 * (in_hardirq() || irqs_disabled()) 3802 * 3803 * We provide four helpers that can be used in following contexts : 3804 * 3805 * dev_kfree_skb_irq(skb) when caller drops a packet from irq context, 3806 * replacing kfree_skb(skb) 3807 * 3808 * dev_consume_skb_irq(skb) when caller consumes a packet from irq context. 3809 * Typically used in place of consume_skb(skb) in TX completion path 3810 * 3811 * dev_kfree_skb_any(skb) when caller doesn't know its current irq context, 3812 * replacing kfree_skb(skb) 3813 * 3814 * dev_consume_skb_any(skb) when caller doesn't know its current irq context, 3815 * and consumed a packet. Used in place of consume_skb(skb) 3816 */ 3817 static inline void dev_kfree_skb_irq(struct sk_buff *skb) 3818 { 3819 __dev_kfree_skb_irq(skb, SKB_REASON_DROPPED); 3820 } 3821 3822 static inline void dev_consume_skb_irq(struct sk_buff *skb) 3823 { 3824 __dev_kfree_skb_irq(skb, SKB_REASON_CONSUMED); 3825 } 3826 3827 static inline void dev_kfree_skb_any(struct sk_buff *skb) 3828 { 3829 __dev_kfree_skb_any(skb, SKB_REASON_DROPPED); 3830 } 3831 3832 static inline void dev_consume_skb_any(struct sk_buff *skb) 3833 { 3834 __dev_kfree_skb_any(skb, SKB_REASON_CONSUMED); 3835 } 3836 3837 u32 bpf_prog_run_generic_xdp(struct sk_buff *skb, struct xdp_buff *xdp, 3838 struct bpf_prog *xdp_prog); 3839 void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog); 3840 int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb); 3841 int netif_rx(struct sk_buff *skb); 3842 int __netif_rx(struct sk_buff *skb); 3843 3844 int netif_receive_skb(struct sk_buff *skb); 3845 int netif_receive_skb_core(struct sk_buff *skb); 3846 void netif_receive_skb_list_internal(struct list_head *head); 3847 void netif_receive_skb_list(struct list_head *head); 3848 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb); 3849 void napi_gro_flush(struct napi_struct *napi, bool flush_old); 3850 struct sk_buff *napi_get_frags(struct napi_struct *napi); 3851 void napi_get_frags_check(struct napi_struct *napi); 3852 gro_result_t napi_gro_frags(struct napi_struct *napi); 3853 struct packet_offload *gro_find_receive_by_type(__be16 type); 3854 struct packet_offload *gro_find_complete_by_type(__be16 type); 3855 3856 static inline void napi_free_frags(struct napi_struct *napi) 3857 { 3858 kfree_skb(napi->skb); 3859 napi->skb = NULL; 3860 } 3861 3862 bool netdev_is_rx_handler_busy(struct net_device *dev); 3863 int netdev_rx_handler_register(struct net_device *dev, 3864 rx_handler_func_t *rx_handler, 3865 void *rx_handler_data); 3866 void netdev_rx_handler_unregister(struct net_device *dev); 3867 3868 bool dev_valid_name(const char *name); 3869 static inline bool is_socket_ioctl_cmd(unsigned int cmd) 3870 { 3871 return _IOC_TYPE(cmd) == SOCK_IOC_TYPE; 3872 } 3873 int get_user_ifreq(struct ifreq *ifr, void __user **ifrdata, void __user *arg); 3874 int put_user_ifreq(struct ifreq *ifr, void __user *arg); 3875 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, 3876 void __user *data, bool *need_copyout); 3877 int dev_ifconf(struct net *net, struct ifconf __user *ifc); 3878 int dev_ethtool(struct net *net, struct ifreq *ifr, void __user *userdata); 3879 unsigned int dev_get_flags(const struct net_device *); 3880 int __dev_change_flags(struct net_device *dev, unsigned int flags, 3881 struct netlink_ext_ack *extack); 3882 int dev_change_flags(struct net_device *dev, unsigned int flags, 3883 struct netlink_ext_ack *extack); 3884 int dev_set_alias(struct net_device *, const char *, size_t); 3885 int dev_get_alias(const struct net_device *, char *, size_t); 3886 int __dev_change_net_namespace(struct net_device *dev, struct net *net, 3887 const char *pat, int new_ifindex); 3888 static inline 3889 int dev_change_net_namespace(struct net_device *dev, struct net *net, 3890 const char *pat) 3891 { 3892 return __dev_change_net_namespace(dev, net, pat, 0); 3893 } 3894 int __dev_set_mtu(struct net_device *, int); 3895 int dev_set_mtu(struct net_device *, int); 3896 int dev_pre_changeaddr_notify(struct net_device *dev, const char *addr, 3897 struct netlink_ext_ack *extack); 3898 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa, 3899 struct netlink_ext_ack *extack); 3900 int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa, 3901 struct netlink_ext_ack *extack); 3902 int dev_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name); 3903 int dev_get_port_parent_id(struct net_device *dev, 3904 struct netdev_phys_item_id *ppid, bool recurse); 3905 bool netdev_port_same_parent_id(struct net_device *a, struct net_device *b); 3906 struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again); 3907 struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, 3908 struct netdev_queue *txq, int *ret); 3909 3910 int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog); 3911 u8 dev_xdp_prog_count(struct net_device *dev); 3912 u32 dev_xdp_prog_id(struct net_device *dev, enum bpf_xdp_mode mode); 3913 3914 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb); 3915 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb); 3916 int dev_forward_skb_nomtu(struct net_device *dev, struct sk_buff *skb); 3917 bool is_skb_forwardable(const struct net_device *dev, 3918 const struct sk_buff *skb); 3919 3920 static __always_inline bool __is_skb_forwardable(const struct net_device *dev, 3921 const struct sk_buff *skb, 3922 const bool check_mtu) 3923 { 3924 const u32 vlan_hdr_len = 4; /* VLAN_HLEN */ 3925 unsigned int len; 3926 3927 if (!(dev->flags & IFF_UP)) 3928 return false; 3929 3930 if (!check_mtu) 3931 return true; 3932 3933 len = dev->mtu + dev->hard_header_len + vlan_hdr_len; 3934 if (skb->len <= len) 3935 return true; 3936 3937 /* if TSO is enabled, we don't care about the length as the packet 3938 * could be forwarded without being segmented before 3939 */ 3940 if (skb_is_gso(skb)) 3941 return true; 3942 3943 return false; 3944 } 3945 3946 struct net_device_core_stats __percpu *netdev_core_stats_alloc(struct net_device *dev); 3947 3948 static inline struct net_device_core_stats __percpu *dev_core_stats(struct net_device *dev) 3949 { 3950 /* This READ_ONCE() pairs with the write in netdev_core_stats_alloc() */ 3951 struct net_device_core_stats __percpu *p = READ_ONCE(dev->core_stats); 3952 3953 if (likely(p)) 3954 return p; 3955 3956 return netdev_core_stats_alloc(dev); 3957 } 3958 3959 #define DEV_CORE_STATS_INC(FIELD) \ 3960 static inline void dev_core_stats_##FIELD##_inc(struct net_device *dev) \ 3961 { \ 3962 struct net_device_core_stats __percpu *p; \ 3963 \ 3964 p = dev_core_stats(dev); \ 3965 if (p) \ 3966 this_cpu_inc(p->FIELD); \ 3967 } 3968 DEV_CORE_STATS_INC(rx_dropped) 3969 DEV_CORE_STATS_INC(tx_dropped) 3970 DEV_CORE_STATS_INC(rx_nohandler) 3971 DEV_CORE_STATS_INC(rx_otherhost_dropped) 3972 3973 static __always_inline int ____dev_forward_skb(struct net_device *dev, 3974 struct sk_buff *skb, 3975 const bool check_mtu) 3976 { 3977 if (skb_orphan_frags(skb, GFP_ATOMIC) || 3978 unlikely(!__is_skb_forwardable(dev, skb, check_mtu))) { 3979 dev_core_stats_rx_dropped_inc(dev); 3980 kfree_skb(skb); 3981 return NET_RX_DROP; 3982 } 3983 3984 skb_scrub_packet(skb, !net_eq(dev_net(dev), dev_net(skb->dev))); 3985 skb->priority = 0; 3986 return 0; 3987 } 3988 3989 bool dev_nit_active(struct net_device *dev); 3990 void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev); 3991 3992 static inline void __dev_put(struct net_device *dev) 3993 { 3994 if (dev) { 3995 #ifdef CONFIG_PCPU_DEV_REFCNT 3996 this_cpu_dec(*dev->pcpu_refcnt); 3997 #else 3998 refcount_dec(&dev->dev_refcnt); 3999 #endif 4000 } 4001 } 4002 4003 static inline void __dev_hold(struct net_device *dev) 4004 { 4005 if (dev) { 4006 #ifdef CONFIG_PCPU_DEV_REFCNT 4007 this_cpu_inc(*dev->pcpu_refcnt); 4008 #else 4009 refcount_inc(&dev->dev_refcnt); 4010 #endif 4011 } 4012 } 4013 4014 static inline void __netdev_tracker_alloc(struct net_device *dev, 4015 netdevice_tracker *tracker, 4016 gfp_t gfp) 4017 { 4018 #ifdef CONFIG_NET_DEV_REFCNT_TRACKER 4019 ref_tracker_alloc(&dev->refcnt_tracker, tracker, gfp); 4020 #endif 4021 } 4022 4023 /* netdev_tracker_alloc() can upgrade a prior untracked reference 4024 * taken by dev_get_by_name()/dev_get_by_index() to a tracked one. 4025 */ 4026 static inline void netdev_tracker_alloc(struct net_device *dev, 4027 netdevice_tracker *tracker, gfp_t gfp) 4028 { 4029 #ifdef CONFIG_NET_DEV_REFCNT_TRACKER 4030 refcount_dec(&dev->refcnt_tracker.no_tracker); 4031 __netdev_tracker_alloc(dev, tracker, gfp); 4032 #endif 4033 } 4034 4035 static inline void netdev_tracker_free(struct net_device *dev, 4036 netdevice_tracker *tracker) 4037 { 4038 #ifdef CONFIG_NET_DEV_REFCNT_TRACKER 4039 ref_tracker_free(&dev->refcnt_tracker, tracker); 4040 #endif 4041 } 4042 4043 static inline void netdev_hold(struct net_device *dev, 4044 netdevice_tracker *tracker, gfp_t gfp) 4045 { 4046 if (dev) { 4047 __dev_hold(dev); 4048 __netdev_tracker_alloc(dev, tracker, gfp); 4049 } 4050 } 4051 4052 static inline void netdev_put(struct net_device *dev, 4053 netdevice_tracker *tracker) 4054 { 4055 if (dev) { 4056 netdev_tracker_free(dev, tracker); 4057 __dev_put(dev); 4058 } 4059 } 4060 4061 /** 4062 * dev_hold - get reference to device 4063 * @dev: network device 4064 * 4065 * Hold reference to device to keep it from being freed. 4066 * Try using netdev_hold() instead. 4067 */ 4068 static inline void dev_hold(struct net_device *dev) 4069 { 4070 netdev_hold(dev, NULL, GFP_ATOMIC); 4071 } 4072 4073 /** 4074 * dev_put - release reference to device 4075 * @dev: network device 4076 * 4077 * Release reference to device to allow it to be freed. 4078 * Try using netdev_put() instead. 4079 */ 4080 static inline void dev_put(struct net_device *dev) 4081 { 4082 netdev_put(dev, NULL); 4083 } 4084 4085 static inline void netdev_ref_replace(struct net_device *odev, 4086 struct net_device *ndev, 4087 netdevice_tracker *tracker, 4088 gfp_t gfp) 4089 { 4090 if (odev) 4091 netdev_tracker_free(odev, tracker); 4092 4093 __dev_hold(ndev); 4094 __dev_put(odev); 4095 4096 if (ndev) 4097 __netdev_tracker_alloc(ndev, tracker, gfp); 4098 } 4099 4100 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 4101 * and _off may be called from IRQ context, but it is caller 4102 * who is responsible for serialization of these calls. 4103 * 4104 * The name carrier is inappropriate, these functions should really be 4105 * called netif_lowerlayer_*() because they represent the state of any 4106 * kind of lower layer not just hardware media. 4107 */ 4108 void linkwatch_fire_event(struct net_device *dev); 4109 4110 /** 4111 * netif_carrier_ok - test if carrier present 4112 * @dev: network device 4113 * 4114 * Check if carrier is present on device 4115 */ 4116 static inline bool netif_carrier_ok(const struct net_device *dev) 4117 { 4118 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 4119 } 4120 4121 unsigned long dev_trans_start(struct net_device *dev); 4122 4123 void __netdev_watchdog_up(struct net_device *dev); 4124 4125 void netif_carrier_on(struct net_device *dev); 4126 void netif_carrier_off(struct net_device *dev); 4127 void netif_carrier_event(struct net_device *dev); 4128 4129 /** 4130 * netif_dormant_on - mark device as dormant. 4131 * @dev: network device 4132 * 4133 * Mark device as dormant (as per RFC2863). 4134 * 4135 * The dormant state indicates that the relevant interface is not 4136 * actually in a condition to pass packets (i.e., it is not 'up') but is 4137 * in a "pending" state, waiting for some external event. For "on- 4138 * demand" interfaces, this new state identifies the situation where the 4139 * interface is waiting for events to place it in the up state. 4140 */ 4141 static inline void netif_dormant_on(struct net_device *dev) 4142 { 4143 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 4144 linkwatch_fire_event(dev); 4145 } 4146 4147 /** 4148 * netif_dormant_off - set device as not dormant. 4149 * @dev: network device 4150 * 4151 * Device is not in dormant state. 4152 */ 4153 static inline void netif_dormant_off(struct net_device *dev) 4154 { 4155 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 4156 linkwatch_fire_event(dev); 4157 } 4158 4159 /** 4160 * netif_dormant - test if device is dormant 4161 * @dev: network device 4162 * 4163 * Check if device is dormant. 4164 */ 4165 static inline bool netif_dormant(const struct net_device *dev) 4166 { 4167 return test_bit(__LINK_STATE_DORMANT, &dev->state); 4168 } 4169 4170 4171 /** 4172 * netif_testing_on - mark device as under test. 4173 * @dev: network device 4174 * 4175 * Mark device as under test (as per RFC2863). 4176 * 4177 * The testing state indicates that some test(s) must be performed on 4178 * the interface. After completion, of the test, the interface state 4179 * will change to up, dormant, or down, as appropriate. 4180 */ 4181 static inline void netif_testing_on(struct net_device *dev) 4182 { 4183 if (!test_and_set_bit(__LINK_STATE_TESTING, &dev->state)) 4184 linkwatch_fire_event(dev); 4185 } 4186 4187 /** 4188 * netif_testing_off - set device as not under test. 4189 * @dev: network device 4190 * 4191 * Device is not in testing state. 4192 */ 4193 static inline void netif_testing_off(struct net_device *dev) 4194 { 4195 if (test_and_clear_bit(__LINK_STATE_TESTING, &dev->state)) 4196 linkwatch_fire_event(dev); 4197 } 4198 4199 /** 4200 * netif_testing - test if device is under test 4201 * @dev: network device 4202 * 4203 * Check if device is under test 4204 */ 4205 static inline bool netif_testing(const struct net_device *dev) 4206 { 4207 return test_bit(__LINK_STATE_TESTING, &dev->state); 4208 } 4209 4210 4211 /** 4212 * netif_oper_up - test if device is operational 4213 * @dev: network device 4214 * 4215 * Check if carrier is operational 4216 */ 4217 static inline bool netif_oper_up(const struct net_device *dev) 4218 { 4219 return (dev->operstate == IF_OPER_UP || 4220 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 4221 } 4222 4223 /** 4224 * netif_device_present - is device available or removed 4225 * @dev: network device 4226 * 4227 * Check if device has not been removed from system. 4228 */ 4229 static inline bool netif_device_present(const struct net_device *dev) 4230 { 4231 return test_bit(__LINK_STATE_PRESENT, &dev->state); 4232 } 4233 4234 void netif_device_detach(struct net_device *dev); 4235 4236 void netif_device_attach(struct net_device *dev); 4237 4238 /* 4239 * Network interface message level settings 4240 */ 4241 4242 enum { 4243 NETIF_MSG_DRV_BIT, 4244 NETIF_MSG_PROBE_BIT, 4245 NETIF_MSG_LINK_BIT, 4246 NETIF_MSG_TIMER_BIT, 4247 NETIF_MSG_IFDOWN_BIT, 4248 NETIF_MSG_IFUP_BIT, 4249 NETIF_MSG_RX_ERR_BIT, 4250 NETIF_MSG_TX_ERR_BIT, 4251 NETIF_MSG_TX_QUEUED_BIT, 4252 NETIF_MSG_INTR_BIT, 4253 NETIF_MSG_TX_DONE_BIT, 4254 NETIF_MSG_RX_STATUS_BIT, 4255 NETIF_MSG_PKTDATA_BIT, 4256 NETIF_MSG_HW_BIT, 4257 NETIF_MSG_WOL_BIT, 4258 4259 /* When you add a new bit above, update netif_msg_class_names array 4260 * in net/ethtool/common.c 4261 */ 4262 NETIF_MSG_CLASS_COUNT, 4263 }; 4264 /* Both ethtool_ops interface and internal driver implementation use u32 */ 4265 static_assert(NETIF_MSG_CLASS_COUNT <= 32); 4266 4267 #define __NETIF_MSG_BIT(bit) ((u32)1 << (bit)) 4268 #define __NETIF_MSG(name) __NETIF_MSG_BIT(NETIF_MSG_ ## name ## _BIT) 4269 4270 #define NETIF_MSG_DRV __NETIF_MSG(DRV) 4271 #define NETIF_MSG_PROBE __NETIF_MSG(PROBE) 4272 #define NETIF_MSG_LINK __NETIF_MSG(LINK) 4273 #define NETIF_MSG_TIMER __NETIF_MSG(TIMER) 4274 #define NETIF_MSG_IFDOWN __NETIF_MSG(IFDOWN) 4275 #define NETIF_MSG_IFUP __NETIF_MSG(IFUP) 4276 #define NETIF_MSG_RX_ERR __NETIF_MSG(RX_ERR) 4277 #define NETIF_MSG_TX_ERR __NETIF_MSG(TX_ERR) 4278 #define NETIF_MSG_TX_QUEUED __NETIF_MSG(TX_QUEUED) 4279 #define NETIF_MSG_INTR __NETIF_MSG(INTR) 4280 #define NETIF_MSG_TX_DONE __NETIF_MSG(TX_DONE) 4281 #define NETIF_MSG_RX_STATUS __NETIF_MSG(RX_STATUS) 4282 #define NETIF_MSG_PKTDATA __NETIF_MSG(PKTDATA) 4283 #define NETIF_MSG_HW __NETIF_MSG(HW) 4284 #define NETIF_MSG_WOL __NETIF_MSG(WOL) 4285 4286 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 4287 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 4288 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 4289 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 4290 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 4291 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 4292 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 4293 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 4294 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 4295 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 4296 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 4297 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 4298 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 4299 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 4300 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 4301 4302 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 4303 { 4304 /* use default */ 4305 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 4306 return default_msg_enable_bits; 4307 if (debug_value == 0) /* no output */ 4308 return 0; 4309 /* set low N bits */ 4310 return (1U << debug_value) - 1; 4311 } 4312 4313 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu) 4314 { 4315 spin_lock(&txq->_xmit_lock); 4316 /* Pairs with READ_ONCE() in __dev_queue_xmit() */ 4317 WRITE_ONCE(txq->xmit_lock_owner, cpu); 4318 } 4319 4320 static inline bool __netif_tx_acquire(struct netdev_queue *txq) 4321 { 4322 __acquire(&txq->_xmit_lock); 4323 return true; 4324 } 4325 4326 static inline void __netif_tx_release(struct netdev_queue *txq) 4327 { 4328 __release(&txq->_xmit_lock); 4329 } 4330 4331 static inline void __netif_tx_lock_bh(struct netdev_queue *txq) 4332 { 4333 spin_lock_bh(&txq->_xmit_lock); 4334 /* Pairs with READ_ONCE() in __dev_queue_xmit() */ 4335 WRITE_ONCE(txq->xmit_lock_owner, smp_processor_id()); 4336 } 4337 4338 static inline bool __netif_tx_trylock(struct netdev_queue *txq) 4339 { 4340 bool ok = spin_trylock(&txq->_xmit_lock); 4341 4342 if (likely(ok)) { 4343 /* Pairs with READ_ONCE() in __dev_queue_xmit() */ 4344 WRITE_ONCE(txq->xmit_lock_owner, smp_processor_id()); 4345 } 4346 return ok; 4347 } 4348 4349 static inline void __netif_tx_unlock(struct netdev_queue *txq) 4350 { 4351 /* Pairs with READ_ONCE() in __dev_queue_xmit() */ 4352 WRITE_ONCE(txq->xmit_lock_owner, -1); 4353 spin_unlock(&txq->_xmit_lock); 4354 } 4355 4356 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq) 4357 { 4358 /* Pairs with READ_ONCE() in __dev_queue_xmit() */ 4359 WRITE_ONCE(txq->xmit_lock_owner, -1); 4360 spin_unlock_bh(&txq->_xmit_lock); 4361 } 4362 4363 /* 4364 * txq->trans_start can be read locklessly from dev_watchdog() 4365 */ 4366 static inline void txq_trans_update(struct netdev_queue *txq) 4367 { 4368 if (txq->xmit_lock_owner != -1) 4369 WRITE_ONCE(txq->trans_start, jiffies); 4370 } 4371 4372 static inline void txq_trans_cond_update(struct netdev_queue *txq) 4373 { 4374 unsigned long now = jiffies; 4375 4376 if (READ_ONCE(txq->trans_start) != now) 4377 WRITE_ONCE(txq->trans_start, now); 4378 } 4379 4380 /* legacy drivers only, netdev_start_xmit() sets txq->trans_start */ 4381 static inline void netif_trans_update(struct net_device *dev) 4382 { 4383 struct netdev_queue *txq = netdev_get_tx_queue(dev, 0); 4384 4385 txq_trans_cond_update(txq); 4386 } 4387 4388 /** 4389 * netif_tx_lock - grab network device transmit lock 4390 * @dev: network device 4391 * 4392 * Get network device transmit lock 4393 */ 4394 void netif_tx_lock(struct net_device *dev); 4395 4396 static inline void netif_tx_lock_bh(struct net_device *dev) 4397 { 4398 local_bh_disable(); 4399 netif_tx_lock(dev); 4400 } 4401 4402 void netif_tx_unlock(struct net_device *dev); 4403 4404 static inline void netif_tx_unlock_bh(struct net_device *dev) 4405 { 4406 netif_tx_unlock(dev); 4407 local_bh_enable(); 4408 } 4409 4410 #define HARD_TX_LOCK(dev, txq, cpu) { \ 4411 if ((dev->features & NETIF_F_LLTX) == 0) { \ 4412 __netif_tx_lock(txq, cpu); \ 4413 } else { \ 4414 __netif_tx_acquire(txq); \ 4415 } \ 4416 } 4417 4418 #define HARD_TX_TRYLOCK(dev, txq) \ 4419 (((dev->features & NETIF_F_LLTX) == 0) ? \ 4420 __netif_tx_trylock(txq) : \ 4421 __netif_tx_acquire(txq)) 4422 4423 #define HARD_TX_UNLOCK(dev, txq) { \ 4424 if ((dev->features & NETIF_F_LLTX) == 0) { \ 4425 __netif_tx_unlock(txq); \ 4426 } else { \ 4427 __netif_tx_release(txq); \ 4428 } \ 4429 } 4430 4431 static inline void netif_tx_disable(struct net_device *dev) 4432 { 4433 unsigned int i; 4434 int cpu; 4435 4436 local_bh_disable(); 4437 cpu = smp_processor_id(); 4438 spin_lock(&dev->tx_global_lock); 4439 for (i = 0; i < dev->num_tx_queues; i++) { 4440 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 4441 4442 __netif_tx_lock(txq, cpu); 4443 netif_tx_stop_queue(txq); 4444 __netif_tx_unlock(txq); 4445 } 4446 spin_unlock(&dev->tx_global_lock); 4447 local_bh_enable(); 4448 } 4449 4450 static inline void netif_addr_lock(struct net_device *dev) 4451 { 4452 unsigned char nest_level = 0; 4453 4454 #ifdef CONFIG_LOCKDEP 4455 nest_level = dev->nested_level; 4456 #endif 4457 spin_lock_nested(&dev->addr_list_lock, nest_level); 4458 } 4459 4460 static inline void netif_addr_lock_bh(struct net_device *dev) 4461 { 4462 unsigned char nest_level = 0; 4463 4464 #ifdef CONFIG_LOCKDEP 4465 nest_level = dev->nested_level; 4466 #endif 4467 local_bh_disable(); 4468 spin_lock_nested(&dev->addr_list_lock, nest_level); 4469 } 4470 4471 static inline void netif_addr_unlock(struct net_device *dev) 4472 { 4473 spin_unlock(&dev->addr_list_lock); 4474 } 4475 4476 static inline void netif_addr_unlock_bh(struct net_device *dev) 4477 { 4478 spin_unlock_bh(&dev->addr_list_lock); 4479 } 4480 4481 /* 4482 * dev_addrs walker. Should be used only for read access. Call with 4483 * rcu_read_lock held. 4484 */ 4485 #define for_each_dev_addr(dev, ha) \ 4486 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list) 4487 4488 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 4489 4490 void ether_setup(struct net_device *dev); 4491 4492 /* Support for loadable net-drivers */ 4493 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, 4494 unsigned char name_assign_type, 4495 void (*setup)(struct net_device *), 4496 unsigned int txqs, unsigned int rxqs); 4497 #define alloc_netdev(sizeof_priv, name, name_assign_type, setup) \ 4498 alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, 1, 1) 4499 4500 #define alloc_netdev_mq(sizeof_priv, name, name_assign_type, setup, count) \ 4501 alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, count, \ 4502 count) 4503 4504 int register_netdev(struct net_device *dev); 4505 void unregister_netdev(struct net_device *dev); 4506 4507 int devm_register_netdev(struct device *dev, struct net_device *ndev); 4508 4509 /* General hardware address lists handling functions */ 4510 int __hw_addr_sync(struct netdev_hw_addr_list *to_list, 4511 struct netdev_hw_addr_list *from_list, int addr_len); 4512 void __hw_addr_unsync(struct netdev_hw_addr_list *to_list, 4513 struct netdev_hw_addr_list *from_list, int addr_len); 4514 int __hw_addr_sync_dev(struct netdev_hw_addr_list *list, 4515 struct net_device *dev, 4516 int (*sync)(struct net_device *, const unsigned char *), 4517 int (*unsync)(struct net_device *, 4518 const unsigned char *)); 4519 int __hw_addr_ref_sync_dev(struct netdev_hw_addr_list *list, 4520 struct net_device *dev, 4521 int (*sync)(struct net_device *, 4522 const unsigned char *, int), 4523 int (*unsync)(struct net_device *, 4524 const unsigned char *, int)); 4525 void __hw_addr_ref_unsync_dev(struct netdev_hw_addr_list *list, 4526 struct net_device *dev, 4527 int (*unsync)(struct net_device *, 4528 const unsigned char *, int)); 4529 void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list, 4530 struct net_device *dev, 4531 int (*unsync)(struct net_device *, 4532 const unsigned char *)); 4533 void __hw_addr_init(struct netdev_hw_addr_list *list); 4534 4535 /* Functions used for device addresses handling */ 4536 void dev_addr_mod(struct net_device *dev, unsigned int offset, 4537 const void *addr, size_t len); 4538 4539 static inline void 4540 __dev_addr_set(struct net_device *dev, const void *addr, size_t len) 4541 { 4542 dev_addr_mod(dev, 0, addr, len); 4543 } 4544 4545 static inline void dev_addr_set(struct net_device *dev, const u8 *addr) 4546 { 4547 __dev_addr_set(dev, addr, dev->addr_len); 4548 } 4549 4550 int dev_addr_add(struct net_device *dev, const unsigned char *addr, 4551 unsigned char addr_type); 4552 int dev_addr_del(struct net_device *dev, const unsigned char *addr, 4553 unsigned char addr_type); 4554 4555 /* Functions used for unicast addresses handling */ 4556 int dev_uc_add(struct net_device *dev, const unsigned char *addr); 4557 int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr); 4558 int dev_uc_del(struct net_device *dev, const unsigned char *addr); 4559 int dev_uc_sync(struct net_device *to, struct net_device *from); 4560 int dev_uc_sync_multiple(struct net_device *to, struct net_device *from); 4561 void dev_uc_unsync(struct net_device *to, struct net_device *from); 4562 void dev_uc_flush(struct net_device *dev); 4563 void dev_uc_init(struct net_device *dev); 4564 4565 /** 4566 * __dev_uc_sync - Synchonize device's unicast list 4567 * @dev: device to sync 4568 * @sync: function to call if address should be added 4569 * @unsync: function to call if address should be removed 4570 * 4571 * Add newly added addresses to the interface, and release 4572 * addresses that have been deleted. 4573 */ 4574 static inline int __dev_uc_sync(struct net_device *dev, 4575 int (*sync)(struct net_device *, 4576 const unsigned char *), 4577 int (*unsync)(struct net_device *, 4578 const unsigned char *)) 4579 { 4580 return __hw_addr_sync_dev(&dev->uc, dev, sync, unsync); 4581 } 4582 4583 /** 4584 * __dev_uc_unsync - Remove synchronized addresses from device 4585 * @dev: device to sync 4586 * @unsync: function to call if address should be removed 4587 * 4588 * Remove all addresses that were added to the device by dev_uc_sync(). 4589 */ 4590 static inline void __dev_uc_unsync(struct net_device *dev, 4591 int (*unsync)(struct net_device *, 4592 const unsigned char *)) 4593 { 4594 __hw_addr_unsync_dev(&dev->uc, dev, unsync); 4595 } 4596 4597 /* Functions used for multicast addresses handling */ 4598 int dev_mc_add(struct net_device *dev, const unsigned char *addr); 4599 int dev_mc_add_global(struct net_device *dev, const unsigned char *addr); 4600 int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr); 4601 int dev_mc_del(struct net_device *dev, const unsigned char *addr); 4602 int dev_mc_del_global(struct net_device *dev, const unsigned char *addr); 4603 int dev_mc_sync(struct net_device *to, struct net_device *from); 4604 int dev_mc_sync_multiple(struct net_device *to, struct net_device *from); 4605 void dev_mc_unsync(struct net_device *to, struct net_device *from); 4606 void dev_mc_flush(struct net_device *dev); 4607 void dev_mc_init(struct net_device *dev); 4608 4609 /** 4610 * __dev_mc_sync - Synchonize device's multicast list 4611 * @dev: device to sync 4612 * @sync: function to call if address should be added 4613 * @unsync: function to call if address should be removed 4614 * 4615 * Add newly added addresses to the interface, and release 4616 * addresses that have been deleted. 4617 */ 4618 static inline int __dev_mc_sync(struct net_device *dev, 4619 int (*sync)(struct net_device *, 4620 const unsigned char *), 4621 int (*unsync)(struct net_device *, 4622 const unsigned char *)) 4623 { 4624 return __hw_addr_sync_dev(&dev->mc, dev, sync, unsync); 4625 } 4626 4627 /** 4628 * __dev_mc_unsync - Remove synchronized addresses from device 4629 * @dev: device to sync 4630 * @unsync: function to call if address should be removed 4631 * 4632 * Remove all addresses that were added to the device by dev_mc_sync(). 4633 */ 4634 static inline void __dev_mc_unsync(struct net_device *dev, 4635 int (*unsync)(struct net_device *, 4636 const unsigned char *)) 4637 { 4638 __hw_addr_unsync_dev(&dev->mc, dev, unsync); 4639 } 4640 4641 /* Functions used for secondary unicast and multicast support */ 4642 void dev_set_rx_mode(struct net_device *dev); 4643 int dev_set_promiscuity(struct net_device *dev, int inc); 4644 int dev_set_allmulti(struct net_device *dev, int inc); 4645 void netdev_state_change(struct net_device *dev); 4646 void __netdev_notify_peers(struct net_device *dev); 4647 void netdev_notify_peers(struct net_device *dev); 4648 void netdev_features_change(struct net_device *dev); 4649 /* Load a device via the kmod */ 4650 void dev_load(struct net *net, const char *name); 4651 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, 4652 struct rtnl_link_stats64 *storage); 4653 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, 4654 const struct net_device_stats *netdev_stats); 4655 void dev_fetch_sw_netstats(struct rtnl_link_stats64 *s, 4656 const struct pcpu_sw_netstats __percpu *netstats); 4657 void dev_get_tstats64(struct net_device *dev, struct rtnl_link_stats64 *s); 4658 4659 extern int netdev_max_backlog; 4660 extern int dev_rx_weight; 4661 extern int dev_tx_weight; 4662 extern int gro_normal_batch; 4663 4664 enum { 4665 NESTED_SYNC_IMM_BIT, 4666 NESTED_SYNC_TODO_BIT, 4667 }; 4668 4669 #define __NESTED_SYNC_BIT(bit) ((u32)1 << (bit)) 4670 #define __NESTED_SYNC(name) __NESTED_SYNC_BIT(NESTED_SYNC_ ## name ## _BIT) 4671 4672 #define NESTED_SYNC_IMM __NESTED_SYNC(IMM) 4673 #define NESTED_SYNC_TODO __NESTED_SYNC(TODO) 4674 4675 struct netdev_nested_priv { 4676 unsigned char flags; 4677 void *data; 4678 }; 4679 4680 bool netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev); 4681 struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, 4682 struct list_head **iter); 4683 4684 /* iterate through upper list, must be called under RCU read lock */ 4685 #define netdev_for_each_upper_dev_rcu(dev, updev, iter) \ 4686 for (iter = &(dev)->adj_list.upper, \ 4687 updev = netdev_upper_get_next_dev_rcu(dev, &(iter)); \ 4688 updev; \ 4689 updev = netdev_upper_get_next_dev_rcu(dev, &(iter))) 4690 4691 int netdev_walk_all_upper_dev_rcu(struct net_device *dev, 4692 int (*fn)(struct net_device *upper_dev, 4693 struct netdev_nested_priv *priv), 4694 struct netdev_nested_priv *priv); 4695 4696 bool netdev_has_upper_dev_all_rcu(struct net_device *dev, 4697 struct net_device *upper_dev); 4698 4699 bool netdev_has_any_upper_dev(struct net_device *dev); 4700 4701 void *netdev_lower_get_next_private(struct net_device *dev, 4702 struct list_head **iter); 4703 void *netdev_lower_get_next_private_rcu(struct net_device *dev, 4704 struct list_head **iter); 4705 4706 #define netdev_for_each_lower_private(dev, priv, iter) \ 4707 for (iter = (dev)->adj_list.lower.next, \ 4708 priv = netdev_lower_get_next_private(dev, &(iter)); \ 4709 priv; \ 4710 priv = netdev_lower_get_next_private(dev, &(iter))) 4711 4712 #define netdev_for_each_lower_private_rcu(dev, priv, iter) \ 4713 for (iter = &(dev)->adj_list.lower, \ 4714 priv = netdev_lower_get_next_private_rcu(dev, &(iter)); \ 4715 priv; \ 4716 priv = netdev_lower_get_next_private_rcu(dev, &(iter))) 4717 4718 void *netdev_lower_get_next(struct net_device *dev, 4719 struct list_head **iter); 4720 4721 #define netdev_for_each_lower_dev(dev, ldev, iter) \ 4722 for (iter = (dev)->adj_list.lower.next, \ 4723 ldev = netdev_lower_get_next(dev, &(iter)); \ 4724 ldev; \ 4725 ldev = netdev_lower_get_next(dev, &(iter))) 4726 4727 struct net_device *netdev_next_lower_dev_rcu(struct net_device *dev, 4728 struct list_head **iter); 4729 int netdev_walk_all_lower_dev(struct net_device *dev, 4730 int (*fn)(struct net_device *lower_dev, 4731 struct netdev_nested_priv *priv), 4732 struct netdev_nested_priv *priv); 4733 int netdev_walk_all_lower_dev_rcu(struct net_device *dev, 4734 int (*fn)(struct net_device *lower_dev, 4735 struct netdev_nested_priv *priv), 4736 struct netdev_nested_priv *priv); 4737 4738 void *netdev_adjacent_get_private(struct list_head *adj_list); 4739 void *netdev_lower_get_first_private_rcu(struct net_device *dev); 4740 struct net_device *netdev_master_upper_dev_get(struct net_device *dev); 4741 struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev); 4742 int netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev, 4743 struct netlink_ext_ack *extack); 4744 int netdev_master_upper_dev_link(struct net_device *dev, 4745 struct net_device *upper_dev, 4746 void *upper_priv, void *upper_info, 4747 struct netlink_ext_ack *extack); 4748 void netdev_upper_dev_unlink(struct net_device *dev, 4749 struct net_device *upper_dev); 4750 int netdev_adjacent_change_prepare(struct net_device *old_dev, 4751 struct net_device *new_dev, 4752 struct net_device *dev, 4753 struct netlink_ext_ack *extack); 4754 void netdev_adjacent_change_commit(struct net_device *old_dev, 4755 struct net_device *new_dev, 4756 struct net_device *dev); 4757 void netdev_adjacent_change_abort(struct net_device *old_dev, 4758 struct net_device *new_dev, 4759 struct net_device *dev); 4760 void netdev_adjacent_rename_links(struct net_device *dev, char *oldname); 4761 void *netdev_lower_dev_get_private(struct net_device *dev, 4762 struct net_device *lower_dev); 4763 void netdev_lower_state_changed(struct net_device *lower_dev, 4764 void *lower_state_info); 4765 4766 /* RSS keys are 40 or 52 bytes long */ 4767 #define NETDEV_RSS_KEY_LEN 52 4768 extern u8 netdev_rss_key[NETDEV_RSS_KEY_LEN] __read_mostly; 4769 void netdev_rss_key_fill(void *buffer, size_t len); 4770 4771 int skb_checksum_help(struct sk_buff *skb); 4772 int skb_crc32c_csum_help(struct sk_buff *skb); 4773 int skb_csum_hwoffload_help(struct sk_buff *skb, 4774 const netdev_features_t features); 4775 4776 struct sk_buff *__skb_gso_segment(struct sk_buff *skb, 4777 netdev_features_t features, bool tx_path); 4778 struct sk_buff *skb_eth_gso_segment(struct sk_buff *skb, 4779 netdev_features_t features, __be16 type); 4780 struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb, 4781 netdev_features_t features); 4782 4783 struct netdev_bonding_info { 4784 ifslave slave; 4785 ifbond master; 4786 }; 4787 4788 struct netdev_notifier_bonding_info { 4789 struct netdev_notifier_info info; /* must be first */ 4790 struct netdev_bonding_info bonding_info; 4791 }; 4792 4793 void netdev_bonding_info_change(struct net_device *dev, 4794 struct netdev_bonding_info *bonding_info); 4795 4796 #if IS_ENABLED(CONFIG_ETHTOOL_NETLINK) 4797 void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data); 4798 #else 4799 static inline void ethtool_notify(struct net_device *dev, unsigned int cmd, 4800 const void *data) 4801 { 4802 } 4803 #endif 4804 4805 static inline 4806 struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features) 4807 { 4808 return __skb_gso_segment(skb, features, true); 4809 } 4810 __be16 skb_network_protocol(struct sk_buff *skb, int *depth); 4811 4812 static inline bool can_checksum_protocol(netdev_features_t features, 4813 __be16 protocol) 4814 { 4815 if (protocol == htons(ETH_P_FCOE)) 4816 return !!(features & NETIF_F_FCOE_CRC); 4817 4818 /* Assume this is an IP checksum (not SCTP CRC) */ 4819 4820 if (features & NETIF_F_HW_CSUM) { 4821 /* Can checksum everything */ 4822 return true; 4823 } 4824 4825 switch (protocol) { 4826 case htons(ETH_P_IP): 4827 return !!(features & NETIF_F_IP_CSUM); 4828 case htons(ETH_P_IPV6): 4829 return !!(features & NETIF_F_IPV6_CSUM); 4830 default: 4831 return false; 4832 } 4833 } 4834 4835 #ifdef CONFIG_BUG 4836 void netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb); 4837 #else 4838 static inline void netdev_rx_csum_fault(struct net_device *dev, 4839 struct sk_buff *skb) 4840 { 4841 } 4842 #endif 4843 /* rx skb timestamps */ 4844 void net_enable_timestamp(void); 4845 void net_disable_timestamp(void); 4846 4847 static inline ktime_t netdev_get_tstamp(struct net_device *dev, 4848 const struct skb_shared_hwtstamps *hwtstamps, 4849 bool cycles) 4850 { 4851 const struct net_device_ops *ops = dev->netdev_ops; 4852 4853 if (ops->ndo_get_tstamp) 4854 return ops->ndo_get_tstamp(dev, hwtstamps, cycles); 4855 4856 return hwtstamps->hwtstamp; 4857 } 4858 4859 static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops, 4860 struct sk_buff *skb, struct net_device *dev, 4861 bool more) 4862 { 4863 __this_cpu_write(softnet_data.xmit.more, more); 4864 return ops->ndo_start_xmit(skb, dev); 4865 } 4866 4867 static inline bool netdev_xmit_more(void) 4868 { 4869 return __this_cpu_read(softnet_data.xmit.more); 4870 } 4871 4872 static inline netdev_tx_t netdev_start_xmit(struct sk_buff *skb, struct net_device *dev, 4873 struct netdev_queue *txq, bool more) 4874 { 4875 const struct net_device_ops *ops = dev->netdev_ops; 4876 netdev_tx_t rc; 4877 4878 rc = __netdev_start_xmit(ops, skb, dev, more); 4879 if (rc == NETDEV_TX_OK) 4880 txq_trans_update(txq); 4881 4882 return rc; 4883 } 4884 4885 int netdev_class_create_file_ns(const struct class_attribute *class_attr, 4886 const void *ns); 4887 void netdev_class_remove_file_ns(const struct class_attribute *class_attr, 4888 const void *ns); 4889 4890 extern const struct kobj_ns_type_operations net_ns_type_operations; 4891 4892 const char *netdev_drivername(const struct net_device *dev); 4893 4894 static inline netdev_features_t netdev_intersect_features(netdev_features_t f1, 4895 netdev_features_t f2) 4896 { 4897 if ((f1 ^ f2) & NETIF_F_HW_CSUM) { 4898 if (f1 & NETIF_F_HW_CSUM) 4899 f1 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); 4900 else 4901 f2 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); 4902 } 4903 4904 return f1 & f2; 4905 } 4906 4907 static inline netdev_features_t netdev_get_wanted_features( 4908 struct net_device *dev) 4909 { 4910 return (dev->features & ~dev->hw_features) | dev->wanted_features; 4911 } 4912 netdev_features_t netdev_increment_features(netdev_features_t all, 4913 netdev_features_t one, netdev_features_t mask); 4914 4915 /* Allow TSO being used on stacked device : 4916 * Performing the GSO segmentation before last device 4917 * is a performance improvement. 4918 */ 4919 static inline netdev_features_t netdev_add_tso_features(netdev_features_t features, 4920 netdev_features_t mask) 4921 { 4922 return netdev_increment_features(features, NETIF_F_ALL_TSO, mask); 4923 } 4924 4925 int __netdev_update_features(struct net_device *dev); 4926 void netdev_update_features(struct net_device *dev); 4927 void netdev_change_features(struct net_device *dev); 4928 4929 void netif_stacked_transfer_operstate(const struct net_device *rootdev, 4930 struct net_device *dev); 4931 4932 netdev_features_t passthru_features_check(struct sk_buff *skb, 4933 struct net_device *dev, 4934 netdev_features_t features); 4935 netdev_features_t netif_skb_features(struct sk_buff *skb); 4936 4937 static inline bool net_gso_ok(netdev_features_t features, int gso_type) 4938 { 4939 netdev_features_t feature = (netdev_features_t)gso_type << NETIF_F_GSO_SHIFT; 4940 4941 /* check flags correspondence */ 4942 BUILD_BUG_ON(SKB_GSO_TCPV4 != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT)); 4943 BUILD_BUG_ON(SKB_GSO_DODGY != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT)); 4944 BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT)); 4945 BUILD_BUG_ON(SKB_GSO_TCP_FIXEDID != (NETIF_F_TSO_MANGLEID >> NETIF_F_GSO_SHIFT)); 4946 BUILD_BUG_ON(SKB_GSO_TCPV6 != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT)); 4947 BUILD_BUG_ON(SKB_GSO_FCOE != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT)); 4948 BUILD_BUG_ON(SKB_GSO_GRE != (NETIF_F_GSO_GRE >> NETIF_F_GSO_SHIFT)); 4949 BUILD_BUG_ON(SKB_GSO_GRE_CSUM != (NETIF_F_GSO_GRE_CSUM >> NETIF_F_GSO_SHIFT)); 4950 BUILD_BUG_ON(SKB_GSO_IPXIP4 != (NETIF_F_GSO_IPXIP4 >> NETIF_F_GSO_SHIFT)); 4951 BUILD_BUG_ON(SKB_GSO_IPXIP6 != (NETIF_F_GSO_IPXIP6 >> NETIF_F_GSO_SHIFT)); 4952 BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL != (NETIF_F_GSO_UDP_TUNNEL >> NETIF_F_GSO_SHIFT)); 4953 BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL_CSUM != (NETIF_F_GSO_UDP_TUNNEL_CSUM >> NETIF_F_GSO_SHIFT)); 4954 BUILD_BUG_ON(SKB_GSO_PARTIAL != (NETIF_F_GSO_PARTIAL >> NETIF_F_GSO_SHIFT)); 4955 BUILD_BUG_ON(SKB_GSO_TUNNEL_REMCSUM != (NETIF_F_GSO_TUNNEL_REMCSUM >> NETIF_F_GSO_SHIFT)); 4956 BUILD_BUG_ON(SKB_GSO_SCTP != (NETIF_F_GSO_SCTP >> NETIF_F_GSO_SHIFT)); 4957 BUILD_BUG_ON(SKB_GSO_ESP != (NETIF_F_GSO_ESP >> NETIF_F_GSO_SHIFT)); 4958 BUILD_BUG_ON(SKB_GSO_UDP != (NETIF_F_GSO_UDP >> NETIF_F_GSO_SHIFT)); 4959 BUILD_BUG_ON(SKB_GSO_UDP_L4 != (NETIF_F_GSO_UDP_L4 >> NETIF_F_GSO_SHIFT)); 4960 BUILD_BUG_ON(SKB_GSO_FRAGLIST != (NETIF_F_GSO_FRAGLIST >> NETIF_F_GSO_SHIFT)); 4961 4962 return (features & feature) == feature; 4963 } 4964 4965 static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features) 4966 { 4967 return net_gso_ok(features, skb_shinfo(skb)->gso_type) && 4968 (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST)); 4969 } 4970 4971 static inline bool netif_needs_gso(struct sk_buff *skb, 4972 netdev_features_t features) 4973 { 4974 return skb_is_gso(skb) && (!skb_gso_ok(skb, features) || 4975 unlikely((skb->ip_summed != CHECKSUM_PARTIAL) && 4976 (skb->ip_summed != CHECKSUM_UNNECESSARY))); 4977 } 4978 4979 void netif_set_tso_max_size(struct net_device *dev, unsigned int size); 4980 void netif_set_tso_max_segs(struct net_device *dev, unsigned int segs); 4981 void netif_inherit_tso_max(struct net_device *to, 4982 const struct net_device *from); 4983 4984 static inline void skb_gso_error_unwind(struct sk_buff *skb, __be16 protocol, 4985 int pulled_hlen, u16 mac_offset, 4986 int mac_len) 4987 { 4988 skb->protocol = protocol; 4989 skb->encapsulation = 1; 4990 skb_push(skb, pulled_hlen); 4991 skb_reset_transport_header(skb); 4992 skb->mac_header = mac_offset; 4993 skb->network_header = skb->mac_header + mac_len; 4994 skb->mac_len = mac_len; 4995 } 4996 4997 static inline bool netif_is_macsec(const struct net_device *dev) 4998 { 4999 return dev->priv_flags & IFF_MACSEC; 5000 } 5001 5002 static inline bool netif_is_macvlan(const struct net_device *dev) 5003 { 5004 return dev->priv_flags & IFF_MACVLAN; 5005 } 5006 5007 static inline bool netif_is_macvlan_port(const struct net_device *dev) 5008 { 5009 return dev->priv_flags & IFF_MACVLAN_PORT; 5010 } 5011 5012 static inline bool netif_is_bond_master(const struct net_device *dev) 5013 { 5014 return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING; 5015 } 5016 5017 static inline bool netif_is_bond_slave(const struct net_device *dev) 5018 { 5019 return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING; 5020 } 5021 5022 static inline bool netif_supports_nofcs(struct net_device *dev) 5023 { 5024 return dev->priv_flags & IFF_SUPP_NOFCS; 5025 } 5026 5027 static inline bool netif_has_l3_rx_handler(const struct net_device *dev) 5028 { 5029 return dev->priv_flags & IFF_L3MDEV_RX_HANDLER; 5030 } 5031 5032 static inline bool netif_is_l3_master(const struct net_device *dev) 5033 { 5034 return dev->priv_flags & IFF_L3MDEV_MASTER; 5035 } 5036 5037 static inline bool netif_is_l3_slave(const struct net_device *dev) 5038 { 5039 return dev->priv_flags & IFF_L3MDEV_SLAVE; 5040 } 5041 5042 static inline bool netif_is_bridge_master(const struct net_device *dev) 5043 { 5044 return dev->priv_flags & IFF_EBRIDGE; 5045 } 5046 5047 static inline bool netif_is_bridge_port(const struct net_device *dev) 5048 { 5049 return dev->priv_flags & IFF_BRIDGE_PORT; 5050 } 5051 5052 static inline bool netif_is_ovs_master(const struct net_device *dev) 5053 { 5054 return dev->priv_flags & IFF_OPENVSWITCH; 5055 } 5056 5057 static inline bool netif_is_ovs_port(const struct net_device *dev) 5058 { 5059 return dev->priv_flags & IFF_OVS_DATAPATH; 5060 } 5061 5062 static inline bool netif_is_any_bridge_port(const struct net_device *dev) 5063 { 5064 return netif_is_bridge_port(dev) || netif_is_ovs_port(dev); 5065 } 5066 5067 static inline bool netif_is_team_master(const struct net_device *dev) 5068 { 5069 return dev->priv_flags & IFF_TEAM; 5070 } 5071 5072 static inline bool netif_is_team_port(const struct net_device *dev) 5073 { 5074 return dev->priv_flags & IFF_TEAM_PORT; 5075 } 5076 5077 static inline bool netif_is_lag_master(const struct net_device *dev) 5078 { 5079 return netif_is_bond_master(dev) || netif_is_team_master(dev); 5080 } 5081 5082 static inline bool netif_is_lag_port(const struct net_device *dev) 5083 { 5084 return netif_is_bond_slave(dev) || netif_is_team_port(dev); 5085 } 5086 5087 static inline bool netif_is_rxfh_configured(const struct net_device *dev) 5088 { 5089 return dev->priv_flags & IFF_RXFH_CONFIGURED; 5090 } 5091 5092 static inline bool netif_is_failover(const struct net_device *dev) 5093 { 5094 return dev->priv_flags & IFF_FAILOVER; 5095 } 5096 5097 static inline bool netif_is_failover_slave(const struct net_device *dev) 5098 { 5099 return dev->priv_flags & IFF_FAILOVER_SLAVE; 5100 } 5101 5102 /* This device needs to keep skb dst for qdisc enqueue or ndo_start_xmit() */ 5103 static inline void netif_keep_dst(struct net_device *dev) 5104 { 5105 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM); 5106 } 5107 5108 /* return true if dev can't cope with mtu frames that need vlan tag insertion */ 5109 static inline bool netif_reduces_vlan_mtu(struct net_device *dev) 5110 { 5111 /* TODO: reserve and use an additional IFF bit, if we get more users */ 5112 return netif_is_macsec(dev); 5113 } 5114 5115 extern struct pernet_operations __net_initdata loopback_net_ops; 5116 5117 /* Logging, debugging and troubleshooting/diagnostic helpers. */ 5118 5119 /* netdev_printk helpers, similar to dev_printk */ 5120 5121 static inline const char *netdev_name(const struct net_device *dev) 5122 { 5123 if (!dev->name[0] || strchr(dev->name, '%')) 5124 return "(unnamed net_device)"; 5125 return dev->name; 5126 } 5127 5128 static inline const char *netdev_reg_state(const struct net_device *dev) 5129 { 5130 switch (dev->reg_state) { 5131 case NETREG_UNINITIALIZED: return " (uninitialized)"; 5132 case NETREG_REGISTERED: return ""; 5133 case NETREG_UNREGISTERING: return " (unregistering)"; 5134 case NETREG_UNREGISTERED: return " (unregistered)"; 5135 case NETREG_RELEASED: return " (released)"; 5136 case NETREG_DUMMY: return " (dummy)"; 5137 } 5138 5139 WARN_ONCE(1, "%s: unknown reg_state %d\n", dev->name, dev->reg_state); 5140 return " (unknown)"; 5141 } 5142 5143 #define MODULE_ALIAS_NETDEV(device) \ 5144 MODULE_ALIAS("netdev-" device) 5145 5146 /* 5147 * netdev_WARN() acts like dev_printk(), but with the key difference 5148 * of using a WARN/WARN_ON to get the message out, including the 5149 * file/line information and a backtrace. 5150 */ 5151 #define netdev_WARN(dev, format, args...) \ 5152 WARN(1, "netdevice: %s%s: " format, netdev_name(dev), \ 5153 netdev_reg_state(dev), ##args) 5154 5155 #define netdev_WARN_ONCE(dev, format, args...) \ 5156 WARN_ONCE(1, "netdevice: %s%s: " format, netdev_name(dev), \ 5157 netdev_reg_state(dev), ##args) 5158 5159 /* 5160 * The list of packet types we will receive (as opposed to discard) 5161 * and the routines to invoke. 5162 * 5163 * Why 16. Because with 16 the only overlap we get on a hash of the 5164 * low nibble of the protocol value is RARP/SNAP/X.25. 5165 * 5166 * 0800 IP 5167 * 0001 802.3 5168 * 0002 AX.25 5169 * 0004 802.2 5170 * 8035 RARP 5171 * 0005 SNAP 5172 * 0805 X.25 5173 * 0806 ARP 5174 * 8137 IPX 5175 * 0009 Localtalk 5176 * 86DD IPv6 5177 */ 5178 #define PTYPE_HASH_SIZE (16) 5179 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1) 5180 5181 extern struct list_head ptype_all __read_mostly; 5182 extern struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; 5183 5184 extern struct net_device *blackhole_netdev; 5185 5186 /* Note: Avoid these macros in fast path, prefer per-cpu or per-queue counters. */ 5187 #define DEV_STATS_INC(DEV, FIELD) atomic_long_inc(&(DEV)->stats.__##FIELD) 5188 #define DEV_STATS_ADD(DEV, FIELD, VAL) \ 5189 atomic_long_add((VAL), &(DEV)->stats.__##FIELD) 5190 5191 #endif /* _LINUX_NETDEVICE_H */ 5192