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