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