1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Definitions for the Interfaces handler. 7 * 8 * Version: @(#)dev.h 1.0.10 08/12/93 9 * 10 * Authors: Ross Biro 11 * Fred N. van Kempen, <[email protected]> 12 * Corey Minyard <[email protected]> 13 * Donald J. Becker, <[email protected]> 14 * Alan Cox, <[email protected]> 15 * Bjorn Ekwall. <[email protected]> 16 * Pekka Riikonen <[email protected]> 17 * 18 * This program is free software; you can redistribute it and/or 19 * modify it under the terms of the GNU General Public License 20 * as published by the Free Software Foundation; either version 21 * 2 of the License, or (at your option) any later version. 22 * 23 * Moved to /usr/include/linux for NET3 24 */ 25 #ifndef _LINUX_NETDEVICE_H 26 #define _LINUX_NETDEVICE_H 27 28 #include <linux/timer.h> 29 #include <linux/bug.h> 30 #include <linux/delay.h> 31 #include <linux/atomic.h> 32 #include <linux/prefetch.h> 33 #include <asm/cache.h> 34 #include <asm/byteorder.h> 35 36 #include <linux/percpu.h> 37 #include <linux/rculist.h> 38 #include <linux/workqueue.h> 39 #include <linux/dynamic_queue_limits.h> 40 41 #include <linux/ethtool.h> 42 #include <net/net_namespace.h> 43 #ifdef CONFIG_DCB 44 #include <net/dcbnl.h> 45 #endif 46 #include <net/netprio_cgroup.h> 47 48 #include <linux/netdev_features.h> 49 #include <linux/neighbour.h> 50 #include <uapi/linux/netdevice.h> 51 #include <uapi/linux/if_bonding.h> 52 #include <uapi/linux/pkt_cls.h> 53 #include <linux/hashtable.h> 54 55 struct netpoll_info; 56 struct device; 57 struct phy_device; 58 struct dsa_port; 59 60 /* 802.11 specific */ 61 struct wireless_dev; 62 /* 802.15.4 specific */ 63 struct wpan_dev; 64 struct mpls_dev; 65 /* UDP Tunnel offloads */ 66 struct udp_tunnel_info; 67 struct bpf_prog; 68 struct xdp_buff; 69 70 void netdev_set_default_ethtool_ops(struct net_device *dev, 71 const struct ethtool_ops *ops); 72 73 /* Backlog congestion levels */ 74 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */ 75 #define NET_RX_DROP 1 /* packet dropped */ 76 77 /* 78 * Transmit return codes: transmit return codes originate from three different 79 * namespaces: 80 * 81 * - qdisc return codes 82 * - driver transmit return codes 83 * - errno values 84 * 85 * Drivers are allowed to return any one of those in their hard_start_xmit() 86 * function. Real network devices commonly used with qdiscs should only return 87 * the driver transmit return codes though - when qdiscs are used, the actual 88 * transmission happens asynchronously, so the value is not propagated to 89 * higher layers. Virtual network devices transmit synchronously; in this case 90 * the driver transmit return codes are consumed by dev_queue_xmit(), and all 91 * others are propagated to higher layers. 92 */ 93 94 /* qdisc ->enqueue() return codes. */ 95 #define NET_XMIT_SUCCESS 0x00 96 #define NET_XMIT_DROP 0x01 /* skb dropped */ 97 #define NET_XMIT_CN 0x02 /* congestion notification */ 98 #define NET_XMIT_MASK 0x0f /* qdisc flags in net/sch_generic.h */ 99 100 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It 101 * indicates that the device will soon be dropping packets, or already drops 102 * some packets of the same priority; prompting us to send less aggressively. */ 103 #define net_xmit_eval(e) ((e) == NET_XMIT_CN ? 0 : (e)) 104 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0) 105 106 /* Driver transmit return codes */ 107 #define NETDEV_TX_MASK 0xf0 108 109 enum netdev_tx { 110 __NETDEV_TX_MIN = INT_MIN, /* make sure enum is signed */ 111 NETDEV_TX_OK = 0x00, /* driver took care of packet */ 112 NETDEV_TX_BUSY = 0x10, /* driver tx path was busy*/ 113 }; 114 typedef enum netdev_tx netdev_tx_t; 115 116 /* 117 * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant; 118 * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed. 119 */ 120 static inline bool dev_xmit_complete(int rc) 121 { 122 /* 123 * Positive cases with an skb consumed by a driver: 124 * - successful transmission (rc == NETDEV_TX_OK) 125 * - error while transmitting (rc < 0) 126 * - error while queueing to a different device (rc & NET_XMIT_MASK) 127 */ 128 if (likely(rc < NET_XMIT_MASK)) 129 return true; 130 131 return false; 132 } 133 134 /* 135 * Compute the worst-case header length according to the protocols 136 * used. 137 */ 138 139 #if defined(CONFIG_HYPERV_NET) 140 # define LL_MAX_HEADER 128 141 #elif defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25) 142 # if defined(CONFIG_MAC80211_MESH) 143 # define LL_MAX_HEADER 128 144 # else 145 # define LL_MAX_HEADER 96 146 # endif 147 #else 148 # define LL_MAX_HEADER 32 149 #endif 150 151 #if !IS_ENABLED(CONFIG_NET_IPIP) && !IS_ENABLED(CONFIG_NET_IPGRE) && \ 152 !IS_ENABLED(CONFIG_IPV6_SIT) && !IS_ENABLED(CONFIG_IPV6_TUNNEL) 153 #define MAX_HEADER LL_MAX_HEADER 154 #else 155 #define MAX_HEADER (LL_MAX_HEADER + 48) 156 #endif 157 158 /* 159 * Old network device statistics. Fields are native words 160 * (unsigned long) so they can be read and written atomically. 161 */ 162 163 struct net_device_stats { 164 unsigned long rx_packets; 165 unsigned long tx_packets; 166 unsigned long rx_bytes; 167 unsigned long tx_bytes; 168 unsigned long rx_errors; 169 unsigned long tx_errors; 170 unsigned long rx_dropped; 171 unsigned long tx_dropped; 172 unsigned long multicast; 173 unsigned long collisions; 174 unsigned long rx_length_errors; 175 unsigned long rx_over_errors; 176 unsigned long rx_crc_errors; 177 unsigned long rx_frame_errors; 178 unsigned long rx_fifo_errors; 179 unsigned long rx_missed_errors; 180 unsigned long tx_aborted_errors; 181 unsigned long tx_carrier_errors; 182 unsigned long tx_fifo_errors; 183 unsigned long tx_heartbeat_errors; 184 unsigned long tx_window_errors; 185 unsigned long rx_compressed; 186 unsigned long tx_compressed; 187 }; 188 189 190 #include <linux/cache.h> 191 #include <linux/skbuff.h> 192 193 #ifdef CONFIG_RPS 194 #include <linux/static_key.h> 195 extern struct static_key rps_needed; 196 extern struct static_key rfs_needed; 197 #endif 198 199 struct neighbour; 200 struct neigh_parms; 201 struct sk_buff; 202 203 struct netdev_hw_addr { 204 struct list_head list; 205 unsigned char addr[MAX_ADDR_LEN]; 206 unsigned char type; 207 #define NETDEV_HW_ADDR_T_LAN 1 208 #define NETDEV_HW_ADDR_T_SAN 2 209 #define NETDEV_HW_ADDR_T_SLAVE 3 210 #define NETDEV_HW_ADDR_T_UNICAST 4 211 #define NETDEV_HW_ADDR_T_MULTICAST 5 212 bool global_use; 213 int sync_cnt; 214 int refcount; 215 int synced; 216 struct rcu_head rcu_head; 217 }; 218 219 struct netdev_hw_addr_list { 220 struct list_head list; 221 int count; 222 }; 223 224 #define netdev_hw_addr_list_count(l) ((l)->count) 225 #define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0) 226 #define netdev_hw_addr_list_for_each(ha, l) \ 227 list_for_each_entry(ha, &(l)->list, list) 228 229 #define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc) 230 #define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc) 231 #define netdev_for_each_uc_addr(ha, dev) \ 232 netdev_hw_addr_list_for_each(ha, &(dev)->uc) 233 234 #define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc) 235 #define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc) 236 #define netdev_for_each_mc_addr(ha, dev) \ 237 netdev_hw_addr_list_for_each(ha, &(dev)->mc) 238 239 struct hh_cache { 240 unsigned int hh_len; 241 seqlock_t hh_lock; 242 243 /* cached hardware header; allow for machine alignment needs. */ 244 #define HH_DATA_MOD 16 245 #define HH_DATA_OFF(__len) \ 246 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) 247 #define HH_DATA_ALIGN(__len) \ 248 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) 249 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; 250 }; 251 252 /* Reserve HH_DATA_MOD byte-aligned hard_header_len, but at least that much. 253 * Alternative is: 254 * dev->hard_header_len ? (dev->hard_header_len + 255 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 256 * 257 * We could use other alignment values, but we must maintain the 258 * relationship HH alignment <= LL alignment. 259 */ 260 #define LL_RESERVED_SPACE(dev) \ 261 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 262 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 263 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 264 265 struct header_ops { 266 int (*create) (struct sk_buff *skb, struct net_device *dev, 267 unsigned short type, const void *daddr, 268 const void *saddr, unsigned int len); 269 int (*parse)(const struct sk_buff *skb, unsigned char *haddr); 270 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh, __be16 type); 271 void (*cache_update)(struct hh_cache *hh, 272 const struct net_device *dev, 273 const unsigned char *haddr); 274 bool (*validate)(const char *ll_header, unsigned int len); 275 }; 276 277 /* These flag bits are private to the generic network queueing 278 * layer; they may not be explicitly referenced by any other 279 * code. 280 */ 281 282 enum netdev_state_t { 283 __LINK_STATE_START, 284 __LINK_STATE_PRESENT, 285 __LINK_STATE_NOCARRIER, 286 __LINK_STATE_LINKWATCH_PENDING, 287 __LINK_STATE_DORMANT, 288 }; 289 290 291 /* 292 * This structure holds boot-time configured netdevice settings. They 293 * are then used in the device probing. 294 */ 295 struct netdev_boot_setup { 296 char name[IFNAMSIZ]; 297 struct ifmap map; 298 }; 299 #define NETDEV_BOOT_SETUP_MAX 8 300 301 int __init netdev_boot_setup(char *str); 302 303 /* 304 * Structure for NAPI scheduling similar to tasklet but with weighting 305 */ 306 struct napi_struct { 307 /* The poll_list must only be managed by the entity which 308 * changes the state of the NAPI_STATE_SCHED bit. This means 309 * whoever atomically sets that bit can add this napi_struct 310 * to the per-CPU poll_list, and whoever clears that bit 311 * can remove from the list right before clearing the bit. 312 */ 313 struct list_head poll_list; 314 315 unsigned long state; 316 int weight; 317 unsigned int gro_count; 318 int (*poll)(struct napi_struct *, int); 319 #ifdef CONFIG_NETPOLL 320 int poll_owner; 321 #endif 322 struct net_device *dev; 323 struct sk_buff *gro_list; 324 struct sk_buff *skb; 325 struct hrtimer timer; 326 struct list_head dev_list; 327 struct hlist_node napi_hash_node; 328 unsigned int napi_id; 329 }; 330 331 enum { 332 NAPI_STATE_SCHED, /* Poll is scheduled */ 333 NAPI_STATE_MISSED, /* reschedule a napi */ 334 NAPI_STATE_DISABLE, /* Disable pending */ 335 NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */ 336 NAPI_STATE_HASHED, /* In NAPI hash (busy polling possible) */ 337 NAPI_STATE_NO_BUSY_POLL,/* Do not add in napi_hash, no busy polling */ 338 NAPI_STATE_IN_BUSY_POLL,/* sk_busy_loop() owns this NAPI */ 339 }; 340 341 enum { 342 NAPIF_STATE_SCHED = BIT(NAPI_STATE_SCHED), 343 NAPIF_STATE_MISSED = BIT(NAPI_STATE_MISSED), 344 NAPIF_STATE_DISABLE = BIT(NAPI_STATE_DISABLE), 345 NAPIF_STATE_NPSVC = BIT(NAPI_STATE_NPSVC), 346 NAPIF_STATE_HASHED = BIT(NAPI_STATE_HASHED), 347 NAPIF_STATE_NO_BUSY_POLL = BIT(NAPI_STATE_NO_BUSY_POLL), 348 NAPIF_STATE_IN_BUSY_POLL = BIT(NAPI_STATE_IN_BUSY_POLL), 349 }; 350 351 enum gro_result { 352 GRO_MERGED, 353 GRO_MERGED_FREE, 354 GRO_HELD, 355 GRO_NORMAL, 356 GRO_DROP, 357 GRO_CONSUMED, 358 }; 359 typedef enum gro_result gro_result_t; 360 361 /* 362 * enum rx_handler_result - Possible return values for rx_handlers. 363 * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it 364 * further. 365 * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in 366 * case skb->dev was changed by rx_handler. 367 * @RX_HANDLER_EXACT: Force exact delivery, no wildcard. 368 * @RX_HANDLER_PASS: Do nothing, pass the skb as if no rx_handler was called. 369 * 370 * rx_handlers are functions called from inside __netif_receive_skb(), to do 371 * special processing of the skb, prior to delivery to protocol handlers. 372 * 373 * Currently, a net_device can only have a single rx_handler registered. Trying 374 * to register a second rx_handler will return -EBUSY. 375 * 376 * To register a rx_handler on a net_device, use netdev_rx_handler_register(). 377 * To unregister a rx_handler on a net_device, use 378 * netdev_rx_handler_unregister(). 379 * 380 * Upon return, rx_handler is expected to tell __netif_receive_skb() what to 381 * do with the skb. 382 * 383 * If the rx_handler consumed the skb in some way, it should return 384 * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for 385 * the skb to be delivered in some other way. 386 * 387 * If the rx_handler changed skb->dev, to divert the skb to another 388 * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the 389 * new device will be called if it exists. 390 * 391 * If the rx_handler decides the skb should be ignored, it should return 392 * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that 393 * are registered on exact device (ptype->dev == skb->dev). 394 * 395 * If the rx_handler didn't change skb->dev, but wants the skb to be normally 396 * delivered, it should return RX_HANDLER_PASS. 397 * 398 * A device without a registered rx_handler will behave as if rx_handler 399 * returned RX_HANDLER_PASS. 400 */ 401 402 enum rx_handler_result { 403 RX_HANDLER_CONSUMED, 404 RX_HANDLER_ANOTHER, 405 RX_HANDLER_EXACT, 406 RX_HANDLER_PASS, 407 }; 408 typedef enum rx_handler_result rx_handler_result_t; 409 typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb); 410 411 void __napi_schedule(struct napi_struct *n); 412 void __napi_schedule_irqoff(struct napi_struct *n); 413 414 static inline bool napi_disable_pending(struct napi_struct *n) 415 { 416 return test_bit(NAPI_STATE_DISABLE, &n->state); 417 } 418 419 bool napi_schedule_prep(struct napi_struct *n); 420 421 /** 422 * napi_schedule - schedule NAPI poll 423 * @n: NAPI context 424 * 425 * Schedule NAPI poll routine to be called if it is not already 426 * running. 427 */ 428 static inline void napi_schedule(struct napi_struct *n) 429 { 430 if (napi_schedule_prep(n)) 431 __napi_schedule(n); 432 } 433 434 /** 435 * napi_schedule_irqoff - schedule NAPI poll 436 * @n: NAPI context 437 * 438 * Variant of napi_schedule(), assuming hard irqs are masked. 439 */ 440 static inline void napi_schedule_irqoff(struct napi_struct *n) 441 { 442 if (napi_schedule_prep(n)) 443 __napi_schedule_irqoff(n); 444 } 445 446 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */ 447 static inline bool napi_reschedule(struct napi_struct *napi) 448 { 449 if (napi_schedule_prep(napi)) { 450 __napi_schedule(napi); 451 return true; 452 } 453 return false; 454 } 455 456 bool napi_complete_done(struct napi_struct *n, int work_done); 457 /** 458 * napi_complete - NAPI processing complete 459 * @n: NAPI context 460 * 461 * Mark NAPI processing as complete. 462 * Consider using napi_complete_done() instead. 463 * Return false if device should avoid rearming interrupts. 464 */ 465 static inline bool napi_complete(struct napi_struct *n) 466 { 467 return napi_complete_done(n, 0); 468 } 469 470 /** 471 * napi_hash_del - remove a NAPI from global table 472 * @napi: NAPI context 473 * 474 * Warning: caller must observe RCU grace period 475 * before freeing memory containing @napi, if 476 * this function returns true. 477 * Note: core networking stack automatically calls it 478 * from netif_napi_del(). 479 * Drivers might want to call this helper to combine all 480 * the needed RCU grace periods into a single one. 481 */ 482 bool napi_hash_del(struct napi_struct *napi); 483 484 /** 485 * napi_disable - prevent NAPI from scheduling 486 * @n: NAPI context 487 * 488 * Stop NAPI from being scheduled on this context. 489 * Waits till any outstanding processing completes. 490 */ 491 void napi_disable(struct napi_struct *n); 492 493 /** 494 * napi_enable - enable NAPI scheduling 495 * @n: NAPI context 496 * 497 * Resume NAPI from being scheduled on this context. 498 * Must be paired with napi_disable. 499 */ 500 static inline void napi_enable(struct napi_struct *n) 501 { 502 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); 503 smp_mb__before_atomic(); 504 clear_bit(NAPI_STATE_SCHED, &n->state); 505 clear_bit(NAPI_STATE_NPSVC, &n->state); 506 } 507 508 /** 509 * napi_synchronize - wait until NAPI is not running 510 * @n: NAPI context 511 * 512 * Wait until NAPI is done being scheduled on this context. 513 * Waits till any outstanding processing completes but 514 * does not disable future activations. 515 */ 516 static inline void napi_synchronize(const struct napi_struct *n) 517 { 518 if (IS_ENABLED(CONFIG_SMP)) 519 while (test_bit(NAPI_STATE_SCHED, &n->state)) 520 msleep(1); 521 else 522 barrier(); 523 } 524 525 enum netdev_queue_state_t { 526 __QUEUE_STATE_DRV_XOFF, 527 __QUEUE_STATE_STACK_XOFF, 528 __QUEUE_STATE_FROZEN, 529 }; 530 531 #define QUEUE_STATE_DRV_XOFF (1 << __QUEUE_STATE_DRV_XOFF) 532 #define QUEUE_STATE_STACK_XOFF (1 << __QUEUE_STATE_STACK_XOFF) 533 #define QUEUE_STATE_FROZEN (1 << __QUEUE_STATE_FROZEN) 534 535 #define QUEUE_STATE_ANY_XOFF (QUEUE_STATE_DRV_XOFF | QUEUE_STATE_STACK_XOFF) 536 #define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF | \ 537 QUEUE_STATE_FROZEN) 538 #define QUEUE_STATE_DRV_XOFF_OR_FROZEN (QUEUE_STATE_DRV_XOFF | \ 539 QUEUE_STATE_FROZEN) 540 541 /* 542 * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue. The 543 * netif_tx_* functions below are used to manipulate this flag. The 544 * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit 545 * queue independently. The netif_xmit_*stopped functions below are called 546 * to check if the queue has been stopped by the driver or stack (either 547 * of the XOFF bits are set in the state). Drivers should not need to call 548 * netif_xmit*stopped functions, they should only be using netif_tx_*. 549 */ 550 551 struct netdev_queue { 552 /* 553 * read-mostly part 554 */ 555 struct net_device *dev; 556 struct Qdisc __rcu *qdisc; 557 struct Qdisc *qdisc_sleeping; 558 #ifdef CONFIG_SYSFS 559 struct kobject kobj; 560 #endif 561 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA) 562 int numa_node; 563 #endif 564 unsigned long tx_maxrate; 565 /* 566 * Number of TX timeouts for this queue 567 * (/sys/class/net/DEV/Q/trans_timeout) 568 */ 569 unsigned long trans_timeout; 570 /* 571 * write-mostly part 572 */ 573 spinlock_t _xmit_lock ____cacheline_aligned_in_smp; 574 int xmit_lock_owner; 575 /* 576 * Time (in jiffies) of last Tx 577 */ 578 unsigned long trans_start; 579 580 unsigned long state; 581 582 #ifdef CONFIG_BQL 583 struct dql dql; 584 #endif 585 } ____cacheline_aligned_in_smp; 586 587 static inline int netdev_queue_numa_node_read(const struct netdev_queue *q) 588 { 589 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA) 590 return q->numa_node; 591 #else 592 return NUMA_NO_NODE; 593 #endif 594 } 595 596 static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node) 597 { 598 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA) 599 q->numa_node = node; 600 #endif 601 } 602 603 #ifdef CONFIG_RPS 604 /* 605 * This structure holds an RPS map which can be of variable length. The 606 * map is an array of CPUs. 607 */ 608 struct rps_map { 609 unsigned int len; 610 struct rcu_head rcu; 611 u16 cpus[0]; 612 }; 613 #define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16))) 614 615 /* 616 * The rps_dev_flow structure contains the mapping of a flow to a CPU, the 617 * tail pointer for that CPU's input queue at the time of last enqueue, and 618 * a hardware filter index. 619 */ 620 struct rps_dev_flow { 621 u16 cpu; 622 u16 filter; 623 unsigned int last_qtail; 624 }; 625 #define RPS_NO_FILTER 0xffff 626 627 /* 628 * The rps_dev_flow_table structure contains a table of flow mappings. 629 */ 630 struct rps_dev_flow_table { 631 unsigned int mask; 632 struct rcu_head rcu; 633 struct rps_dev_flow flows[0]; 634 }; 635 #define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \ 636 ((_num) * sizeof(struct rps_dev_flow))) 637 638 /* 639 * The rps_sock_flow_table contains mappings of flows to the last CPU 640 * on which they were processed by the application (set in recvmsg). 641 * Each entry is a 32bit value. Upper part is the high-order bits 642 * of flow hash, lower part is CPU number. 643 * rps_cpu_mask is used to partition the space, depending on number of 644 * possible CPUs : rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1 645 * For example, if 64 CPUs are possible, rps_cpu_mask = 0x3f, 646 * meaning we use 32-6=26 bits for the hash. 647 */ 648 struct rps_sock_flow_table { 649 u32 mask; 650 651 u32 ents[0] ____cacheline_aligned_in_smp; 652 }; 653 #define RPS_SOCK_FLOW_TABLE_SIZE(_num) (offsetof(struct rps_sock_flow_table, ents[_num])) 654 655 #define RPS_NO_CPU 0xffff 656 657 extern u32 rps_cpu_mask; 658 extern struct rps_sock_flow_table __rcu *rps_sock_flow_table; 659 660 static inline void rps_record_sock_flow(struct rps_sock_flow_table *table, 661 u32 hash) 662 { 663 if (table && hash) { 664 unsigned int index = hash & table->mask; 665 u32 val = hash & ~rps_cpu_mask; 666 667 /* We only give a hint, preemption can change CPU under us */ 668 val |= raw_smp_processor_id(); 669 670 if (table->ents[index] != val) 671 table->ents[index] = val; 672 } 673 } 674 675 #ifdef CONFIG_RFS_ACCEL 676 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id, 677 u16 filter_id); 678 #endif 679 #endif /* CONFIG_RPS */ 680 681 /* This structure contains an instance of an RX queue. */ 682 struct netdev_rx_queue { 683 #ifdef CONFIG_RPS 684 struct rps_map __rcu *rps_map; 685 struct rps_dev_flow_table __rcu *rps_flow_table; 686 #endif 687 struct kobject kobj; 688 struct net_device *dev; 689 } ____cacheline_aligned_in_smp; 690 691 /* 692 * RX queue sysfs structures and functions. 693 */ 694 struct rx_queue_attribute { 695 struct attribute attr; 696 ssize_t (*show)(struct netdev_rx_queue *queue, char *buf); 697 ssize_t (*store)(struct netdev_rx_queue *queue, 698 const char *buf, size_t len); 699 }; 700 701 #ifdef CONFIG_XPS 702 /* 703 * This structure holds an XPS map which can be of variable length. The 704 * map is an array of queues. 705 */ 706 struct xps_map { 707 unsigned int len; 708 unsigned int alloc_len; 709 struct rcu_head rcu; 710 u16 queues[0]; 711 }; 712 #define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16))) 713 #define XPS_MIN_MAP_ALLOC ((L1_CACHE_ALIGN(offsetof(struct xps_map, queues[1])) \ 714 - sizeof(struct xps_map)) / sizeof(u16)) 715 716 /* 717 * This structure holds all XPS maps for device. Maps are indexed by CPU. 718 */ 719 struct xps_dev_maps { 720 struct rcu_head rcu; 721 struct xps_map __rcu *cpu_map[0]; 722 }; 723 #define XPS_DEV_MAPS_SIZE(_tcs) (sizeof(struct xps_dev_maps) + \ 724 (nr_cpu_ids * (_tcs) * sizeof(struct xps_map *))) 725 #endif /* CONFIG_XPS */ 726 727 #define TC_MAX_QUEUE 16 728 #define TC_BITMASK 15 729 /* HW offloaded queuing disciplines txq count and offset maps */ 730 struct netdev_tc_txq { 731 u16 count; 732 u16 offset; 733 }; 734 735 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 736 /* 737 * This structure is to hold information about the device 738 * configured to run FCoE protocol stack. 739 */ 740 struct netdev_fcoe_hbainfo { 741 char manufacturer[64]; 742 char serial_number[64]; 743 char hardware_version[64]; 744 char driver_version[64]; 745 char optionrom_version[64]; 746 char firmware_version[64]; 747 char model[256]; 748 char model_description[256]; 749 }; 750 #endif 751 752 #define MAX_PHYS_ITEM_ID_LEN 32 753 754 /* This structure holds a unique identifier to identify some 755 * physical item (port for example) used by a netdevice. 756 */ 757 struct netdev_phys_item_id { 758 unsigned char id[MAX_PHYS_ITEM_ID_LEN]; 759 unsigned char id_len; 760 }; 761 762 static inline bool netdev_phys_item_id_same(struct netdev_phys_item_id *a, 763 struct netdev_phys_item_id *b) 764 { 765 return a->id_len == b->id_len && 766 memcmp(a->id, b->id, a->id_len) == 0; 767 } 768 769 typedef u16 (*select_queue_fallback_t)(struct net_device *dev, 770 struct sk_buff *skb); 771 772 enum tc_setup_type { 773 TC_SETUP_MQPRIO, 774 TC_SETUP_CLSU32, 775 TC_SETUP_CLSFLOWER, 776 TC_SETUP_CLSMATCHALL, 777 TC_SETUP_CLSBPF, 778 TC_SETUP_BLOCK, 779 TC_SETUP_CBS, 780 }; 781 782 /* These structures hold the attributes of bpf state that are being passed 783 * to the netdevice through the bpf op. 784 */ 785 enum bpf_netdev_command { 786 /* Set or clear a bpf program used in the earliest stages of packet 787 * rx. The prog will have been loaded as BPF_PROG_TYPE_XDP. The callee 788 * is responsible for calling bpf_prog_put on any old progs that are 789 * stored. In case of error, the callee need not release the new prog 790 * reference, but on success it takes ownership and must bpf_prog_put 791 * when it is no longer used. 792 */ 793 XDP_SETUP_PROG, 794 XDP_SETUP_PROG_HW, 795 /* Check if a bpf program is set on the device. The callee should 796 * set @prog_attached to one of XDP_ATTACHED_* values, note that "true" 797 * is equivalent to XDP_ATTACHED_DRV. 798 */ 799 XDP_QUERY_PROG, 800 /* BPF program for offload callbacks, invoked at program load time. */ 801 BPF_OFFLOAD_VERIFIER_PREP, 802 BPF_OFFLOAD_TRANSLATE, 803 BPF_OFFLOAD_DESTROY, 804 }; 805 806 struct bpf_ext_analyzer_ops; 807 struct netlink_ext_ack; 808 809 struct netdev_bpf { 810 enum bpf_netdev_command command; 811 union { 812 /* XDP_SETUP_PROG */ 813 struct { 814 u32 flags; 815 struct bpf_prog *prog; 816 struct netlink_ext_ack *extack; 817 }; 818 /* XDP_QUERY_PROG */ 819 struct { 820 u8 prog_attached; 821 u32 prog_id; 822 }; 823 /* BPF_OFFLOAD_VERIFIER_PREP */ 824 struct { 825 struct bpf_prog *prog; 826 const struct bpf_ext_analyzer_ops *ops; /* callee set */ 827 } verifier; 828 /* BPF_OFFLOAD_TRANSLATE, BPF_OFFLOAD_DESTROY */ 829 struct { 830 struct bpf_prog *prog; 831 } offload; 832 }; 833 }; 834 835 #ifdef CONFIG_XFRM_OFFLOAD 836 struct xfrmdev_ops { 837 int (*xdo_dev_state_add) (struct xfrm_state *x); 838 void (*xdo_dev_state_delete) (struct xfrm_state *x); 839 void (*xdo_dev_state_free) (struct xfrm_state *x); 840 bool (*xdo_dev_offload_ok) (struct sk_buff *skb, 841 struct xfrm_state *x); 842 }; 843 #endif 844 845 struct dev_ifalias { 846 struct rcu_head rcuhead; 847 char ifalias[]; 848 }; 849 850 /* 851 * This structure defines the management hooks for network devices. 852 * The following hooks can be defined; unless noted otherwise, they are 853 * optional and can be filled with a null pointer. 854 * 855 * int (*ndo_init)(struct net_device *dev); 856 * This function is called once when a network device is registered. 857 * The network device can use this for any late stage initialization 858 * or semantic validation. It can fail with an error code which will 859 * be propagated back to register_netdev. 860 * 861 * void (*ndo_uninit)(struct net_device *dev); 862 * This function is called when device is unregistered or when registration 863 * fails. It is not called if init fails. 864 * 865 * int (*ndo_open)(struct net_device *dev); 866 * This function is called when a network device transitions to the up 867 * state. 868 * 869 * int (*ndo_stop)(struct net_device *dev); 870 * This function is called when a network device transitions to the down 871 * state. 872 * 873 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb, 874 * struct net_device *dev); 875 * Called when a packet needs to be transmitted. 876 * Returns NETDEV_TX_OK. Can return NETDEV_TX_BUSY, but you should stop 877 * the queue before that can happen; it's for obsolete devices and weird 878 * corner cases, but the stack really does a non-trivial amount 879 * of useless work if you return NETDEV_TX_BUSY. 880 * Required; cannot be NULL. 881 * 882 * netdev_features_t (*ndo_features_check)(struct sk_buff *skb, 883 * struct net_device *dev 884 * netdev_features_t features); 885 * Called by core transmit path to determine if device is capable of 886 * performing offload operations on a given packet. This is to give 887 * the device an opportunity to implement any restrictions that cannot 888 * be otherwise expressed by feature flags. The check is called with 889 * the set of features that the stack has calculated and it returns 890 * those the driver believes to be appropriate. 891 * 892 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb, 893 * void *accel_priv, select_queue_fallback_t fallback); 894 * Called to decide which queue to use when device supports multiple 895 * transmit queues. 896 * 897 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags); 898 * This function is called to allow device receiver to make 899 * changes to configuration when multicast or promiscuous is enabled. 900 * 901 * void (*ndo_set_rx_mode)(struct net_device *dev); 902 * This function is called device changes address list filtering. 903 * If driver handles unicast address filtering, it should set 904 * IFF_UNICAST_FLT in its priv_flags. 905 * 906 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr); 907 * This function is called when the Media Access Control address 908 * needs to be changed. If this interface is not defined, the 909 * MAC address can not be changed. 910 * 911 * int (*ndo_validate_addr)(struct net_device *dev); 912 * Test if Media Access Control address is valid for the device. 913 * 914 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd); 915 * Called when a user requests an ioctl which can't be handled by 916 * the generic interface code. If not defined ioctls return 917 * not supported error code. 918 * 919 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map); 920 * Used to set network devices bus interface parameters. This interface 921 * is retained for legacy reasons; new devices should use the bus 922 * interface (PCI) for low level management. 923 * 924 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu); 925 * Called when a user wants to change the Maximum Transfer Unit 926 * of a device. 927 * 928 * void (*ndo_tx_timeout)(struct net_device *dev); 929 * Callback used when the transmitter has not made any progress 930 * for dev->watchdog ticks. 931 * 932 * void (*ndo_get_stats64)(struct net_device *dev, 933 * struct rtnl_link_stats64 *storage); 934 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev); 935 * Called when a user wants to get the network device usage 936 * statistics. Drivers must do one of the following: 937 * 1. Define @ndo_get_stats64 to fill in a zero-initialised 938 * rtnl_link_stats64 structure passed by the caller. 939 * 2. Define @ndo_get_stats to update a net_device_stats structure 940 * (which should normally be dev->stats) and return a pointer to 941 * it. The structure may be changed asynchronously only if each 942 * field is written atomically. 943 * 3. Update dev->stats asynchronously and atomically, and define 944 * neither operation. 945 * 946 * bool (*ndo_has_offload_stats)(const struct net_device *dev, int attr_id) 947 * Return true if this device supports offload stats of this attr_id. 948 * 949 * int (*ndo_get_offload_stats)(int attr_id, const struct net_device *dev, 950 * void *attr_data) 951 * Get statistics for offload operations by attr_id. Write it into the 952 * attr_data pointer. 953 * 954 * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, __be16 proto, u16 vid); 955 * If device supports VLAN filtering this function is called when a 956 * VLAN id is registered. 957 * 958 * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, __be16 proto, u16 vid); 959 * If device supports VLAN filtering this function is called when a 960 * VLAN id is unregistered. 961 * 962 * void (*ndo_poll_controller)(struct net_device *dev); 963 * 964 * SR-IOV management functions. 965 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac); 966 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, 967 * u8 qos, __be16 proto); 968 * int (*ndo_set_vf_rate)(struct net_device *dev, int vf, int min_tx_rate, 969 * int max_tx_rate); 970 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting); 971 * int (*ndo_set_vf_trust)(struct net_device *dev, int vf, bool setting); 972 * int (*ndo_get_vf_config)(struct net_device *dev, 973 * int vf, struct ifla_vf_info *ivf); 974 * int (*ndo_set_vf_link_state)(struct net_device *dev, int vf, int link_state); 975 * int (*ndo_set_vf_port)(struct net_device *dev, int vf, 976 * struct nlattr *port[]); 977 * 978 * Enable or disable the VF ability to query its RSS Redirection Table and 979 * Hash Key. This is needed since on some devices VF share this information 980 * with PF and querying it may introduce a theoretical security risk. 981 * int (*ndo_set_vf_rss_query_en)(struct net_device *dev, int vf, bool setting); 982 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb); 983 * int (*ndo_setup_tc)(struct net_device *dev, enum tc_setup_type type, 984 * void *type_data); 985 * Called to setup any 'tc' scheduler, classifier or action on @dev. 986 * This is always called from the stack with the rtnl lock held and netif 987 * tx queues stopped. This allows the netdevice to perform queue 988 * management safely. 989 * 990 * Fiber Channel over Ethernet (FCoE) offload functions. 991 * int (*ndo_fcoe_enable)(struct net_device *dev); 992 * Called when the FCoE protocol stack wants to start using LLD for FCoE 993 * so the underlying device can perform whatever needed configuration or 994 * initialization to support acceleration of FCoE traffic. 995 * 996 * int (*ndo_fcoe_disable)(struct net_device *dev); 997 * Called when the FCoE protocol stack wants to stop using LLD for FCoE 998 * so the underlying device can perform whatever needed clean-ups to 999 * stop supporting acceleration of FCoE traffic. 1000 * 1001 * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid, 1002 * struct scatterlist *sgl, unsigned int sgc); 1003 * Called when the FCoE Initiator wants to initialize an I/O that 1004 * is a possible candidate for Direct Data Placement (DDP). The LLD can 1005 * perform necessary setup and returns 1 to indicate the device is set up 1006 * successfully to perform DDP on this I/O, otherwise this returns 0. 1007 * 1008 * int (*ndo_fcoe_ddp_done)(struct net_device *dev, u16 xid); 1009 * Called when the FCoE Initiator/Target is done with the DDPed I/O as 1010 * indicated by the FC exchange id 'xid', so the underlying device can 1011 * clean up and reuse resources for later DDP requests. 1012 * 1013 * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid, 1014 * struct scatterlist *sgl, unsigned int sgc); 1015 * Called when the FCoE Target wants to initialize an I/O that 1016 * is a possible candidate for Direct Data Placement (DDP). The LLD can 1017 * perform necessary setup and returns 1 to indicate the device is set up 1018 * successfully to perform DDP on this I/O, otherwise this returns 0. 1019 * 1020 * int (*ndo_fcoe_get_hbainfo)(struct net_device *dev, 1021 * struct netdev_fcoe_hbainfo *hbainfo); 1022 * Called when the FCoE Protocol stack wants information on the underlying 1023 * device. This information is utilized by the FCoE protocol stack to 1024 * register attributes with Fiber Channel management service as per the 1025 * FC-GS Fabric Device Management Information(FDMI) specification. 1026 * 1027 * int (*ndo_fcoe_get_wwn)(struct net_device *dev, u64 *wwn, int type); 1028 * Called when the underlying device wants to override default World Wide 1029 * Name (WWN) generation mechanism in FCoE protocol stack to pass its own 1030 * World Wide Port Name (WWPN) or World Wide Node Name (WWNN) to the FCoE 1031 * protocol stack to use. 1032 * 1033 * RFS acceleration. 1034 * int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb, 1035 * u16 rxq_index, u32 flow_id); 1036 * Set hardware filter for RFS. rxq_index is the target queue index; 1037 * flow_id is a flow ID to be passed to rps_may_expire_flow() later. 1038 * Return the filter ID on success, or a negative error code. 1039 * 1040 * Slave management functions (for bridge, bonding, etc). 1041 * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev); 1042 * Called to make another netdev an underling. 1043 * 1044 * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev); 1045 * Called to release previously enslaved netdev. 1046 * 1047 * Feature/offload setting functions. 1048 * netdev_features_t (*ndo_fix_features)(struct net_device *dev, 1049 * netdev_features_t features); 1050 * Adjusts the requested feature flags according to device-specific 1051 * constraints, and returns the resulting flags. Must not modify 1052 * the device state. 1053 * 1054 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features); 1055 * Called to update device configuration to new features. Passed 1056 * feature set might be less than what was returned by ndo_fix_features()). 1057 * Must return >0 or -errno if it changed dev->features itself. 1058 * 1059 * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[], 1060 * struct net_device *dev, 1061 * const unsigned char *addr, u16 vid, u16 flags) 1062 * Adds an FDB entry to dev for addr. 1063 * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[], 1064 * struct net_device *dev, 1065 * const unsigned char *addr, u16 vid) 1066 * Deletes the FDB entry from dev coresponding to addr. 1067 * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb, 1068 * struct net_device *dev, struct net_device *filter_dev, 1069 * int *idx) 1070 * Used to add FDB entries to dump requests. Implementers should add 1071 * entries to skb and update idx with the number of entries. 1072 * 1073 * int (*ndo_bridge_setlink)(struct net_device *dev, struct nlmsghdr *nlh, 1074 * u16 flags) 1075 * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq, 1076 * struct net_device *dev, u32 filter_mask, 1077 * int nlflags) 1078 * int (*ndo_bridge_dellink)(struct net_device *dev, struct nlmsghdr *nlh, 1079 * u16 flags); 1080 * 1081 * int (*ndo_change_carrier)(struct net_device *dev, bool new_carrier); 1082 * Called to change device carrier. Soft-devices (like dummy, team, etc) 1083 * which do not represent real hardware may define this to allow their 1084 * userspace components to manage their virtual carrier state. Devices 1085 * that determine carrier state from physical hardware properties (eg 1086 * network cables) or protocol-dependent mechanisms (eg 1087 * USB_CDC_NOTIFY_NETWORK_CONNECTION) should NOT implement this function. 1088 * 1089 * int (*ndo_get_phys_port_id)(struct net_device *dev, 1090 * struct netdev_phys_item_id *ppid); 1091 * Called to get ID of physical port of this device. If driver does 1092 * not implement this, it is assumed that the hw is not able to have 1093 * multiple net devices on single physical port. 1094 * 1095 * void (*ndo_udp_tunnel_add)(struct net_device *dev, 1096 * struct udp_tunnel_info *ti); 1097 * Called by UDP tunnel to notify a driver about the UDP port and socket 1098 * address family that a UDP tunnel is listnening to. It is called only 1099 * when a new port starts listening. The operation is protected by the 1100 * RTNL. 1101 * 1102 * void (*ndo_udp_tunnel_del)(struct net_device *dev, 1103 * struct udp_tunnel_info *ti); 1104 * Called by UDP tunnel to notify the driver about a UDP port and socket 1105 * address family that the UDP tunnel is not listening to anymore. The 1106 * operation is protected by the RTNL. 1107 * 1108 * void* (*ndo_dfwd_add_station)(struct net_device *pdev, 1109 * struct net_device *dev) 1110 * Called by upper layer devices to accelerate switching or other 1111 * station functionality into hardware. 'pdev is the lowerdev 1112 * to use for the offload and 'dev' is the net device that will 1113 * back the offload. Returns a pointer to the private structure 1114 * the upper layer will maintain. 1115 * void (*ndo_dfwd_del_station)(struct net_device *pdev, void *priv) 1116 * Called by upper layer device to delete the station created 1117 * by 'ndo_dfwd_add_station'. 'pdev' is the net device backing 1118 * the station and priv is the structure returned by the add 1119 * operation. 1120 * int (*ndo_set_tx_maxrate)(struct net_device *dev, 1121 * int queue_index, u32 maxrate); 1122 * Called when a user wants to set a max-rate limitation of specific 1123 * TX queue. 1124 * int (*ndo_get_iflink)(const struct net_device *dev); 1125 * Called to get the iflink value of this device. 1126 * void (*ndo_change_proto_down)(struct net_device *dev, 1127 * bool proto_down); 1128 * This function is used to pass protocol port error state information 1129 * to the switch driver. The switch driver can react to the proto_down 1130 * by doing a phys down on the associated switch port. 1131 * int (*ndo_fill_metadata_dst)(struct net_device *dev, struct sk_buff *skb); 1132 * This function is used to get egress tunnel information for given skb. 1133 * This is useful for retrieving outer tunnel header parameters while 1134 * sampling packet. 1135 * void (*ndo_set_rx_headroom)(struct net_device *dev, int needed_headroom); 1136 * This function is used to specify the headroom that the skb must 1137 * consider when allocation skb during packet reception. Setting 1138 * appropriate rx headroom value allows avoiding skb head copy on 1139 * forward. Setting a negative value resets the rx headroom to the 1140 * default value. 1141 * int (*ndo_bpf)(struct net_device *dev, struct netdev_bpf *bpf); 1142 * This function is used to set or query state related to XDP on the 1143 * netdevice and manage BPF offload. See definition of 1144 * enum bpf_netdev_command for details. 1145 * int (*ndo_xdp_xmit)(struct net_device *dev, struct xdp_buff *xdp); 1146 * This function is used to submit a XDP packet for transmit on a 1147 * netdevice. 1148 * void (*ndo_xdp_flush)(struct net_device *dev); 1149 * This function is used to inform the driver to flush a particular 1150 * xdp tx queue. Must be called on same CPU as xdp_xmit. 1151 */ 1152 struct net_device_ops { 1153 int (*ndo_init)(struct net_device *dev); 1154 void (*ndo_uninit)(struct net_device *dev); 1155 int (*ndo_open)(struct net_device *dev); 1156 int (*ndo_stop)(struct net_device *dev); 1157 netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb, 1158 struct net_device *dev); 1159 netdev_features_t (*ndo_features_check)(struct sk_buff *skb, 1160 struct net_device *dev, 1161 netdev_features_t features); 1162 u16 (*ndo_select_queue)(struct net_device *dev, 1163 struct sk_buff *skb, 1164 void *accel_priv, 1165 select_queue_fallback_t fallback); 1166 void (*ndo_change_rx_flags)(struct net_device *dev, 1167 int flags); 1168 void (*ndo_set_rx_mode)(struct net_device *dev); 1169 int (*ndo_set_mac_address)(struct net_device *dev, 1170 void *addr); 1171 int (*ndo_validate_addr)(struct net_device *dev); 1172 int (*ndo_do_ioctl)(struct net_device *dev, 1173 struct ifreq *ifr, int cmd); 1174 int (*ndo_set_config)(struct net_device *dev, 1175 struct ifmap *map); 1176 int (*ndo_change_mtu)(struct net_device *dev, 1177 int new_mtu); 1178 int (*ndo_neigh_setup)(struct net_device *dev, 1179 struct neigh_parms *); 1180 void (*ndo_tx_timeout) (struct net_device *dev); 1181 1182 void (*ndo_get_stats64)(struct net_device *dev, 1183 struct rtnl_link_stats64 *storage); 1184 bool (*ndo_has_offload_stats)(const struct net_device *dev, int attr_id); 1185 int (*ndo_get_offload_stats)(int attr_id, 1186 const struct net_device *dev, 1187 void *attr_data); 1188 struct net_device_stats* (*ndo_get_stats)(struct net_device *dev); 1189 1190 int (*ndo_vlan_rx_add_vid)(struct net_device *dev, 1191 __be16 proto, u16 vid); 1192 int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, 1193 __be16 proto, u16 vid); 1194 #ifdef CONFIG_NET_POLL_CONTROLLER 1195 void (*ndo_poll_controller)(struct net_device *dev); 1196 int (*ndo_netpoll_setup)(struct net_device *dev, 1197 struct netpoll_info *info); 1198 void (*ndo_netpoll_cleanup)(struct net_device *dev); 1199 #endif 1200 int (*ndo_set_vf_mac)(struct net_device *dev, 1201 int queue, u8 *mac); 1202 int (*ndo_set_vf_vlan)(struct net_device *dev, 1203 int queue, u16 vlan, 1204 u8 qos, __be16 proto); 1205 int (*ndo_set_vf_rate)(struct net_device *dev, 1206 int vf, int min_tx_rate, 1207 int max_tx_rate); 1208 int (*ndo_set_vf_spoofchk)(struct net_device *dev, 1209 int vf, bool setting); 1210 int (*ndo_set_vf_trust)(struct net_device *dev, 1211 int vf, bool setting); 1212 int (*ndo_get_vf_config)(struct net_device *dev, 1213 int vf, 1214 struct ifla_vf_info *ivf); 1215 int (*ndo_set_vf_link_state)(struct net_device *dev, 1216 int vf, int link_state); 1217 int (*ndo_get_vf_stats)(struct net_device *dev, 1218 int vf, 1219 struct ifla_vf_stats 1220 *vf_stats); 1221 int (*ndo_set_vf_port)(struct net_device *dev, 1222 int vf, 1223 struct nlattr *port[]); 1224 int (*ndo_get_vf_port)(struct net_device *dev, 1225 int vf, struct sk_buff *skb); 1226 int (*ndo_set_vf_guid)(struct net_device *dev, 1227 int vf, u64 guid, 1228 int guid_type); 1229 int (*ndo_set_vf_rss_query_en)( 1230 struct net_device *dev, 1231 int vf, bool setting); 1232 int (*ndo_setup_tc)(struct net_device *dev, 1233 enum tc_setup_type type, 1234 void *type_data); 1235 #if IS_ENABLED(CONFIG_FCOE) 1236 int (*ndo_fcoe_enable)(struct net_device *dev); 1237 int (*ndo_fcoe_disable)(struct net_device *dev); 1238 int (*ndo_fcoe_ddp_setup)(struct net_device *dev, 1239 u16 xid, 1240 struct scatterlist *sgl, 1241 unsigned int sgc); 1242 int (*ndo_fcoe_ddp_done)(struct net_device *dev, 1243 u16 xid); 1244 int (*ndo_fcoe_ddp_target)(struct net_device *dev, 1245 u16 xid, 1246 struct scatterlist *sgl, 1247 unsigned int sgc); 1248 int (*ndo_fcoe_get_hbainfo)(struct net_device *dev, 1249 struct netdev_fcoe_hbainfo *hbainfo); 1250 #endif 1251 1252 #if IS_ENABLED(CONFIG_LIBFCOE) 1253 #define NETDEV_FCOE_WWNN 0 1254 #define NETDEV_FCOE_WWPN 1 1255 int (*ndo_fcoe_get_wwn)(struct net_device *dev, 1256 u64 *wwn, int type); 1257 #endif 1258 1259 #ifdef CONFIG_RFS_ACCEL 1260 int (*ndo_rx_flow_steer)(struct net_device *dev, 1261 const struct sk_buff *skb, 1262 u16 rxq_index, 1263 u32 flow_id); 1264 #endif 1265 int (*ndo_add_slave)(struct net_device *dev, 1266 struct net_device *slave_dev, 1267 struct netlink_ext_ack *extack); 1268 int (*ndo_del_slave)(struct net_device *dev, 1269 struct net_device *slave_dev); 1270 netdev_features_t (*ndo_fix_features)(struct net_device *dev, 1271 netdev_features_t features); 1272 int (*ndo_set_features)(struct net_device *dev, 1273 netdev_features_t features); 1274 int (*ndo_neigh_construct)(struct net_device *dev, 1275 struct neighbour *n); 1276 void (*ndo_neigh_destroy)(struct net_device *dev, 1277 struct neighbour *n); 1278 1279 int (*ndo_fdb_add)(struct ndmsg *ndm, 1280 struct nlattr *tb[], 1281 struct net_device *dev, 1282 const unsigned char *addr, 1283 u16 vid, 1284 u16 flags); 1285 int (*ndo_fdb_del)(struct ndmsg *ndm, 1286 struct nlattr *tb[], 1287 struct net_device *dev, 1288 const unsigned char *addr, 1289 u16 vid); 1290 int (*ndo_fdb_dump)(struct sk_buff *skb, 1291 struct netlink_callback *cb, 1292 struct net_device *dev, 1293 struct net_device *filter_dev, 1294 int *idx); 1295 1296 int (*ndo_bridge_setlink)(struct net_device *dev, 1297 struct nlmsghdr *nlh, 1298 u16 flags); 1299 int (*ndo_bridge_getlink)(struct sk_buff *skb, 1300 u32 pid, u32 seq, 1301 struct net_device *dev, 1302 u32 filter_mask, 1303 int nlflags); 1304 int (*ndo_bridge_dellink)(struct net_device *dev, 1305 struct nlmsghdr *nlh, 1306 u16 flags); 1307 int (*ndo_change_carrier)(struct net_device *dev, 1308 bool new_carrier); 1309 int (*ndo_get_phys_port_id)(struct net_device *dev, 1310 struct netdev_phys_item_id *ppid); 1311 int (*ndo_get_phys_port_name)(struct net_device *dev, 1312 char *name, size_t len); 1313 void (*ndo_udp_tunnel_add)(struct net_device *dev, 1314 struct udp_tunnel_info *ti); 1315 void (*ndo_udp_tunnel_del)(struct net_device *dev, 1316 struct udp_tunnel_info *ti); 1317 void* (*ndo_dfwd_add_station)(struct net_device *pdev, 1318 struct net_device *dev); 1319 void (*ndo_dfwd_del_station)(struct net_device *pdev, 1320 void *priv); 1321 1322 int (*ndo_get_lock_subclass)(struct net_device *dev); 1323 int (*ndo_set_tx_maxrate)(struct net_device *dev, 1324 int queue_index, 1325 u32 maxrate); 1326 int (*ndo_get_iflink)(const struct net_device *dev); 1327 int (*ndo_change_proto_down)(struct net_device *dev, 1328 bool proto_down); 1329 int (*ndo_fill_metadata_dst)(struct net_device *dev, 1330 struct sk_buff *skb); 1331 void (*ndo_set_rx_headroom)(struct net_device *dev, 1332 int needed_headroom); 1333 int (*ndo_bpf)(struct net_device *dev, 1334 struct netdev_bpf *bpf); 1335 int (*ndo_xdp_xmit)(struct net_device *dev, 1336 struct xdp_buff *xdp); 1337 void (*ndo_xdp_flush)(struct net_device *dev); 1338 }; 1339 1340 /** 1341 * enum net_device_priv_flags - &struct net_device priv_flags 1342 * 1343 * These are the &struct net_device, they are only set internally 1344 * by drivers and used in the kernel. These flags are invisible to 1345 * userspace; this means that the order of these flags can change 1346 * during any kernel release. 1347 * 1348 * You should have a pretty good reason to be extending these flags. 1349 * 1350 * @IFF_802_1Q_VLAN: 802.1Q VLAN device 1351 * @IFF_EBRIDGE: Ethernet bridging device 1352 * @IFF_BONDING: bonding master or slave 1353 * @IFF_ISATAP: ISATAP interface (RFC4214) 1354 * @IFF_WAN_HDLC: WAN HDLC device 1355 * @IFF_XMIT_DST_RELEASE: dev_hard_start_xmit() is allowed to 1356 * release skb->dst 1357 * @IFF_DONT_BRIDGE: disallow bridging this ether dev 1358 * @IFF_DISABLE_NETPOLL: disable netpoll at run-time 1359 * @IFF_MACVLAN_PORT: device used as macvlan port 1360 * @IFF_BRIDGE_PORT: device used as bridge port 1361 * @IFF_OVS_DATAPATH: device used as Open vSwitch datapath port 1362 * @IFF_TX_SKB_SHARING: The interface supports sharing skbs on transmit 1363 * @IFF_UNICAST_FLT: Supports unicast filtering 1364 * @IFF_TEAM_PORT: device used as team port 1365 * @IFF_SUPP_NOFCS: device supports sending custom FCS 1366 * @IFF_LIVE_ADDR_CHANGE: device supports hardware address 1367 * change when it's running 1368 * @IFF_MACVLAN: Macvlan device 1369 * @IFF_XMIT_DST_RELEASE_PERM: IFF_XMIT_DST_RELEASE not taking into account 1370 * underlying stacked devices 1371 * @IFF_IPVLAN_MASTER: IPvlan master device 1372 * @IFF_IPVLAN_SLAVE: IPvlan slave device 1373 * @IFF_L3MDEV_MASTER: device is an L3 master device 1374 * @IFF_NO_QUEUE: device can run without qdisc attached 1375 * @IFF_OPENVSWITCH: device is a Open vSwitch master 1376 * @IFF_L3MDEV_SLAVE: device is enslaved to an L3 master device 1377 * @IFF_TEAM: device is a team device 1378 * @IFF_RXFH_CONFIGURED: device has had Rx Flow indirection table configured 1379 * @IFF_PHONY_HEADROOM: the headroom value is controlled by an external 1380 * entity (i.e. the master device for bridged veth) 1381 * @IFF_MACSEC: device is a MACsec device 1382 */ 1383 enum netdev_priv_flags { 1384 IFF_802_1Q_VLAN = 1<<0, 1385 IFF_EBRIDGE = 1<<1, 1386 IFF_BONDING = 1<<2, 1387 IFF_ISATAP = 1<<3, 1388 IFF_WAN_HDLC = 1<<4, 1389 IFF_XMIT_DST_RELEASE = 1<<5, 1390 IFF_DONT_BRIDGE = 1<<6, 1391 IFF_DISABLE_NETPOLL = 1<<7, 1392 IFF_MACVLAN_PORT = 1<<8, 1393 IFF_BRIDGE_PORT = 1<<9, 1394 IFF_OVS_DATAPATH = 1<<10, 1395 IFF_TX_SKB_SHARING = 1<<11, 1396 IFF_UNICAST_FLT = 1<<12, 1397 IFF_TEAM_PORT = 1<<13, 1398 IFF_SUPP_NOFCS = 1<<14, 1399 IFF_LIVE_ADDR_CHANGE = 1<<15, 1400 IFF_MACVLAN = 1<<16, 1401 IFF_XMIT_DST_RELEASE_PERM = 1<<17, 1402 IFF_IPVLAN_MASTER = 1<<18, 1403 IFF_IPVLAN_SLAVE = 1<<19, 1404 IFF_L3MDEV_MASTER = 1<<20, 1405 IFF_NO_QUEUE = 1<<21, 1406 IFF_OPENVSWITCH = 1<<22, 1407 IFF_L3MDEV_SLAVE = 1<<23, 1408 IFF_TEAM = 1<<24, 1409 IFF_RXFH_CONFIGURED = 1<<25, 1410 IFF_PHONY_HEADROOM = 1<<26, 1411 IFF_MACSEC = 1<<27, 1412 }; 1413 1414 #define IFF_802_1Q_VLAN IFF_802_1Q_VLAN 1415 #define IFF_EBRIDGE IFF_EBRIDGE 1416 #define IFF_BONDING IFF_BONDING 1417 #define IFF_ISATAP IFF_ISATAP 1418 #define IFF_WAN_HDLC IFF_WAN_HDLC 1419 #define IFF_XMIT_DST_RELEASE IFF_XMIT_DST_RELEASE 1420 #define IFF_DONT_BRIDGE IFF_DONT_BRIDGE 1421 #define IFF_DISABLE_NETPOLL IFF_DISABLE_NETPOLL 1422 #define IFF_MACVLAN_PORT IFF_MACVLAN_PORT 1423 #define IFF_BRIDGE_PORT IFF_BRIDGE_PORT 1424 #define IFF_OVS_DATAPATH IFF_OVS_DATAPATH 1425 #define IFF_TX_SKB_SHARING IFF_TX_SKB_SHARING 1426 #define IFF_UNICAST_FLT IFF_UNICAST_FLT 1427 #define IFF_TEAM_PORT IFF_TEAM_PORT 1428 #define IFF_SUPP_NOFCS IFF_SUPP_NOFCS 1429 #define IFF_LIVE_ADDR_CHANGE IFF_LIVE_ADDR_CHANGE 1430 #define IFF_MACVLAN IFF_MACVLAN 1431 #define IFF_XMIT_DST_RELEASE_PERM IFF_XMIT_DST_RELEASE_PERM 1432 #define IFF_IPVLAN_MASTER IFF_IPVLAN_MASTER 1433 #define IFF_IPVLAN_SLAVE IFF_IPVLAN_SLAVE 1434 #define IFF_L3MDEV_MASTER IFF_L3MDEV_MASTER 1435 #define IFF_NO_QUEUE IFF_NO_QUEUE 1436 #define IFF_OPENVSWITCH IFF_OPENVSWITCH 1437 #define IFF_L3MDEV_SLAVE IFF_L3MDEV_SLAVE 1438 #define IFF_TEAM IFF_TEAM 1439 #define IFF_RXFH_CONFIGURED IFF_RXFH_CONFIGURED 1440 #define IFF_MACSEC IFF_MACSEC 1441 1442 /** 1443 * struct net_device - The DEVICE structure. 1444 * 1445 * Actually, this whole structure is a big mistake. It mixes I/O 1446 * data with strictly "high-level" data, and it has to know about 1447 * almost every data structure used in the INET module. 1448 * 1449 * @name: This is the first field of the "visible" part of this structure 1450 * (i.e. as seen by users in the "Space.c" file). It is the name 1451 * of the interface. 1452 * 1453 * @name_hlist: Device name hash chain, please keep it close to name[] 1454 * @ifalias: SNMP alias 1455 * @mem_end: Shared memory end 1456 * @mem_start: Shared memory start 1457 * @base_addr: Device I/O address 1458 * @irq: Device IRQ number 1459 * 1460 * @carrier_changes: Stats to monitor carrier on<->off transitions 1461 * 1462 * @state: Generic network queuing layer state, see netdev_state_t 1463 * @dev_list: The global list of network devices 1464 * @napi_list: List entry used for polling NAPI devices 1465 * @unreg_list: List entry when we are unregistering the 1466 * device; see the function unregister_netdev 1467 * @close_list: List entry used when we are closing the device 1468 * @ptype_all: Device-specific packet handlers for all protocols 1469 * @ptype_specific: Device-specific, protocol-specific packet handlers 1470 * 1471 * @adj_list: Directly linked devices, like slaves for bonding 1472 * @features: Currently active device features 1473 * @hw_features: User-changeable features 1474 * 1475 * @wanted_features: User-requested features 1476 * @vlan_features: Mask of features inheritable by VLAN devices 1477 * 1478 * @hw_enc_features: Mask of features inherited by encapsulating devices 1479 * This field indicates what encapsulation 1480 * offloads the hardware is capable of doing, 1481 * and drivers will need to set them appropriately. 1482 * 1483 * @mpls_features: Mask of features inheritable by MPLS 1484 * 1485 * @ifindex: interface index 1486 * @group: The group the device belongs to 1487 * 1488 * @stats: Statistics struct, which was left as a legacy, use 1489 * rtnl_link_stats64 instead 1490 * 1491 * @rx_dropped: Dropped packets by core network, 1492 * do not use this in drivers 1493 * @tx_dropped: Dropped packets by core network, 1494 * do not use this in drivers 1495 * @rx_nohandler: nohandler dropped packets by core network on 1496 * inactive devices, do not use this in drivers 1497 * 1498 * @wireless_handlers: List of functions to handle Wireless Extensions, 1499 * instead of ioctl, 1500 * see <net/iw_handler.h> for details. 1501 * @wireless_data: Instance data managed by the core of wireless extensions 1502 * 1503 * @netdev_ops: Includes several pointers to callbacks, 1504 * if one wants to override the ndo_*() functions 1505 * @ethtool_ops: Management operations 1506 * @ndisc_ops: Includes callbacks for different IPv6 neighbour 1507 * discovery handling. Necessary for e.g. 6LoWPAN. 1508 * @header_ops: Includes callbacks for creating,parsing,caching,etc 1509 * of Layer 2 headers. 1510 * 1511 * @flags: Interface flags (a la BSD) 1512 * @priv_flags: Like 'flags' but invisible to userspace, 1513 * see if.h for the definitions 1514 * @gflags: Global flags ( kept as legacy ) 1515 * @padded: How much padding added by alloc_netdev() 1516 * @operstate: RFC2863 operstate 1517 * @link_mode: Mapping policy to operstate 1518 * @if_port: Selectable AUI, TP, ... 1519 * @dma: DMA channel 1520 * @mtu: Interface MTU value 1521 * @min_mtu: Interface Minimum MTU value 1522 * @max_mtu: Interface Maximum MTU value 1523 * @type: Interface hardware type 1524 * @hard_header_len: Maximum hardware header length. 1525 * @min_header_len: Minimum hardware header length 1526 * 1527 * @needed_headroom: Extra headroom the hardware may need, but not in all 1528 * cases can this be guaranteed 1529 * @needed_tailroom: Extra tailroom the hardware may need, but not in all 1530 * cases can this be guaranteed. Some cases also use 1531 * LL_MAX_HEADER instead to allocate the skb 1532 * 1533 * interface address info: 1534 * 1535 * @perm_addr: Permanent hw address 1536 * @addr_assign_type: Hw address assignment type 1537 * @addr_len: Hardware address length 1538 * @neigh_priv_len: Used in neigh_alloc() 1539 * @dev_id: Used to differentiate devices that share 1540 * the same link layer address 1541 * @dev_port: Used to differentiate devices that share 1542 * the same function 1543 * @addr_list_lock: XXX: need comments on this one 1544 * @uc_promisc: Counter that indicates promiscuous mode 1545 * has been enabled due to the need to listen to 1546 * additional unicast addresses in a device that 1547 * does not implement ndo_set_rx_mode() 1548 * @uc: unicast mac addresses 1549 * @mc: multicast mac addresses 1550 * @dev_addrs: list of device hw addresses 1551 * @queues_kset: Group of all Kobjects in the Tx and RX queues 1552 * @promiscuity: Number of times the NIC is told to work in 1553 * promiscuous mode; if it becomes 0 the NIC will 1554 * exit promiscuous mode 1555 * @allmulti: Counter, enables or disables allmulticast mode 1556 * 1557 * @vlan_info: VLAN info 1558 * @dsa_ptr: dsa specific data 1559 * @tipc_ptr: TIPC specific data 1560 * @atalk_ptr: AppleTalk link 1561 * @ip_ptr: IPv4 specific data 1562 * @dn_ptr: DECnet specific data 1563 * @ip6_ptr: IPv6 specific data 1564 * @ax25_ptr: AX.25 specific data 1565 * @ieee80211_ptr: IEEE 802.11 specific data, assign before registering 1566 * 1567 * @dev_addr: Hw address (before bcast, 1568 * because most packets are unicast) 1569 * 1570 * @_rx: Array of RX queues 1571 * @num_rx_queues: Number of RX queues 1572 * allocated at register_netdev() time 1573 * @real_num_rx_queues: Number of RX queues currently active in device 1574 * 1575 * @rx_handler: handler for received packets 1576 * @rx_handler_data: XXX: need comments on this one 1577 * @miniq_ingress: ingress/clsact qdisc specific data for 1578 * ingress processing 1579 * @ingress_queue: XXX: need comments on this one 1580 * @broadcast: hw bcast address 1581 * 1582 * @rx_cpu_rmap: CPU reverse-mapping for RX completion interrupts, 1583 * indexed by RX queue number. Assigned by driver. 1584 * This must only be set if the ndo_rx_flow_steer 1585 * operation is defined 1586 * @index_hlist: Device index hash chain 1587 * 1588 * @_tx: Array of TX queues 1589 * @num_tx_queues: Number of TX queues allocated at alloc_netdev_mq() time 1590 * @real_num_tx_queues: Number of TX queues currently active in device 1591 * @qdisc: Root qdisc from userspace point of view 1592 * @tx_queue_len: Max frames per queue allowed 1593 * @tx_global_lock: XXX: need comments on this one 1594 * 1595 * @xps_maps: XXX: need comments on this one 1596 * @miniq_egress: clsact qdisc specific data for 1597 * egress processing 1598 * @watchdog_timeo: Represents the timeout that is used by 1599 * the watchdog (see dev_watchdog()) 1600 * @watchdog_timer: List of timers 1601 * 1602 * @pcpu_refcnt: Number of references to this device 1603 * @todo_list: Delayed register/unregister 1604 * @link_watch_list: XXX: need comments on this one 1605 * 1606 * @reg_state: Register/unregister state machine 1607 * @dismantle: Device is going to be freed 1608 * @rtnl_link_state: This enum represents the phases of creating 1609 * a new link 1610 * 1611 * @needs_free_netdev: Should unregister perform free_netdev? 1612 * @priv_destructor: Called from unregister 1613 * @npinfo: XXX: need comments on this one 1614 * @nd_net: Network namespace this network device is inside 1615 * 1616 * @ml_priv: Mid-layer private 1617 * @lstats: Loopback statistics 1618 * @tstats: Tunnel statistics 1619 * @dstats: Dummy statistics 1620 * @vstats: Virtual ethernet statistics 1621 * 1622 * @garp_port: GARP 1623 * @mrp_port: MRP 1624 * 1625 * @dev: Class/net/name entry 1626 * @sysfs_groups: Space for optional device, statistics and wireless 1627 * sysfs groups 1628 * 1629 * @sysfs_rx_queue_group: Space for optional per-rx queue attributes 1630 * @rtnl_link_ops: Rtnl_link_ops 1631 * 1632 * @gso_max_size: Maximum size of generic segmentation offload 1633 * @gso_max_segs: Maximum number of segments that can be passed to the 1634 * NIC for GSO 1635 * 1636 * @dcbnl_ops: Data Center Bridging netlink ops 1637 * @num_tc: Number of traffic classes in the net device 1638 * @tc_to_txq: XXX: need comments on this one 1639 * @prio_tc_map: XXX: need comments on this one 1640 * 1641 * @fcoe_ddp_xid: Max exchange id for FCoE LRO by ddp 1642 * 1643 * @priomap: XXX: need comments on this one 1644 * @phydev: Physical device may attach itself 1645 * for hardware timestamping 1646 * 1647 * @qdisc_tx_busylock: lockdep class annotating Qdisc->busylock spinlock 1648 * @qdisc_running_key: lockdep class annotating Qdisc->running seqcount 1649 * 1650 * @proto_down: protocol port state information can be sent to the 1651 * switch driver and used to set the phys state of the 1652 * switch port. 1653 * 1654 * FIXME: cleanup struct net_device such that network protocol info 1655 * moves out. 1656 */ 1657 1658 struct net_device { 1659 char name[IFNAMSIZ]; 1660 struct hlist_node name_hlist; 1661 struct dev_ifalias __rcu *ifalias; 1662 /* 1663 * I/O specific fields 1664 * FIXME: Merge these and struct ifmap into one 1665 */ 1666 unsigned long mem_end; 1667 unsigned long mem_start; 1668 unsigned long base_addr; 1669 int irq; 1670 1671 atomic_t carrier_changes; 1672 1673 /* 1674 * Some hardware also needs these fields (state,dev_list, 1675 * napi_list,unreg_list,close_list) but they are not 1676 * part of the usual set specified in Space.c. 1677 */ 1678 1679 unsigned long state; 1680 1681 struct list_head dev_list; 1682 struct list_head napi_list; 1683 struct list_head unreg_list; 1684 struct list_head close_list; 1685 struct list_head ptype_all; 1686 struct list_head ptype_specific; 1687 1688 struct { 1689 struct list_head upper; 1690 struct list_head lower; 1691 } adj_list; 1692 1693 netdev_features_t features; 1694 netdev_features_t hw_features; 1695 netdev_features_t wanted_features; 1696 netdev_features_t vlan_features; 1697 netdev_features_t hw_enc_features; 1698 netdev_features_t mpls_features; 1699 netdev_features_t gso_partial_features; 1700 1701 int ifindex; 1702 int group; 1703 1704 struct net_device_stats stats; 1705 1706 atomic_long_t rx_dropped; 1707 atomic_long_t tx_dropped; 1708 atomic_long_t rx_nohandler; 1709 1710 #ifdef CONFIG_WIRELESS_EXT 1711 const struct iw_handler_def *wireless_handlers; 1712 struct iw_public_data *wireless_data; 1713 #endif 1714 const struct net_device_ops *netdev_ops; 1715 const struct ethtool_ops *ethtool_ops; 1716 #ifdef CONFIG_NET_SWITCHDEV 1717 const struct switchdev_ops *switchdev_ops; 1718 #endif 1719 #ifdef CONFIG_NET_L3_MASTER_DEV 1720 const struct l3mdev_ops *l3mdev_ops; 1721 #endif 1722 #if IS_ENABLED(CONFIG_IPV6) 1723 const struct ndisc_ops *ndisc_ops; 1724 #endif 1725 1726 #ifdef CONFIG_XFRM 1727 const struct xfrmdev_ops *xfrmdev_ops; 1728 #endif 1729 1730 const struct header_ops *header_ops; 1731 1732 unsigned int flags; 1733 unsigned int priv_flags; 1734 1735 unsigned short gflags; 1736 unsigned short padded; 1737 1738 unsigned char operstate; 1739 unsigned char link_mode; 1740 1741 unsigned char if_port; 1742 unsigned char dma; 1743 1744 unsigned int mtu; 1745 unsigned int min_mtu; 1746 unsigned int max_mtu; 1747 unsigned short type; 1748 unsigned short hard_header_len; 1749 unsigned char min_header_len; 1750 1751 unsigned short needed_headroom; 1752 unsigned short needed_tailroom; 1753 1754 /* Interface address info. */ 1755 unsigned char perm_addr[MAX_ADDR_LEN]; 1756 unsigned char addr_assign_type; 1757 unsigned char addr_len; 1758 unsigned short neigh_priv_len; 1759 unsigned short dev_id; 1760 unsigned short dev_port; 1761 spinlock_t addr_list_lock; 1762 unsigned char name_assign_type; 1763 bool uc_promisc; 1764 struct netdev_hw_addr_list uc; 1765 struct netdev_hw_addr_list mc; 1766 struct netdev_hw_addr_list dev_addrs; 1767 1768 #ifdef CONFIG_SYSFS 1769 struct kset *queues_kset; 1770 #endif 1771 unsigned int promiscuity; 1772 unsigned int allmulti; 1773 1774 1775 /* Protocol-specific pointers */ 1776 1777 #if IS_ENABLED(CONFIG_VLAN_8021Q) 1778 struct vlan_info __rcu *vlan_info; 1779 #endif 1780 #if IS_ENABLED(CONFIG_NET_DSA) 1781 struct dsa_port *dsa_ptr; 1782 #endif 1783 #if IS_ENABLED(CONFIG_TIPC) 1784 struct tipc_bearer __rcu *tipc_ptr; 1785 #endif 1786 void *atalk_ptr; 1787 struct in_device __rcu *ip_ptr; 1788 struct dn_dev __rcu *dn_ptr; 1789 struct inet6_dev __rcu *ip6_ptr; 1790 void *ax25_ptr; 1791 struct wireless_dev *ieee80211_ptr; 1792 struct wpan_dev *ieee802154_ptr; 1793 #if IS_ENABLED(CONFIG_MPLS_ROUTING) 1794 struct mpls_dev __rcu *mpls_ptr; 1795 #endif 1796 1797 /* 1798 * Cache lines mostly used on receive path (including eth_type_trans()) 1799 */ 1800 /* Interface address info used in eth_type_trans() */ 1801 unsigned char *dev_addr; 1802 1803 #ifdef CONFIG_SYSFS 1804 struct netdev_rx_queue *_rx; 1805 1806 unsigned int num_rx_queues; 1807 unsigned int real_num_rx_queues; 1808 #endif 1809 1810 struct bpf_prog __rcu *xdp_prog; 1811 unsigned long gro_flush_timeout; 1812 rx_handler_func_t __rcu *rx_handler; 1813 void __rcu *rx_handler_data; 1814 1815 #ifdef CONFIG_NET_CLS_ACT 1816 struct mini_Qdisc __rcu *miniq_ingress; 1817 #endif 1818 struct netdev_queue __rcu *ingress_queue; 1819 #ifdef CONFIG_NETFILTER_INGRESS 1820 struct nf_hook_entries __rcu *nf_hooks_ingress; 1821 #endif 1822 1823 unsigned char broadcast[MAX_ADDR_LEN]; 1824 #ifdef CONFIG_RFS_ACCEL 1825 struct cpu_rmap *rx_cpu_rmap; 1826 #endif 1827 struct hlist_node index_hlist; 1828 1829 /* 1830 * Cache lines mostly used on transmit path 1831 */ 1832 struct netdev_queue *_tx ____cacheline_aligned_in_smp; 1833 unsigned int num_tx_queues; 1834 unsigned int real_num_tx_queues; 1835 struct Qdisc *qdisc; 1836 #ifdef CONFIG_NET_SCHED 1837 DECLARE_HASHTABLE (qdisc_hash, 4); 1838 #endif 1839 unsigned int tx_queue_len; 1840 spinlock_t tx_global_lock; 1841 int watchdog_timeo; 1842 1843 #ifdef CONFIG_XPS 1844 struct xps_dev_maps __rcu *xps_maps; 1845 #endif 1846 #ifdef CONFIG_NET_CLS_ACT 1847 struct mini_Qdisc __rcu *miniq_egress; 1848 #endif 1849 1850 /* These may be needed for future network-power-down code. */ 1851 struct timer_list watchdog_timer; 1852 1853 int __percpu *pcpu_refcnt; 1854 struct list_head todo_list; 1855 1856 struct list_head link_watch_list; 1857 1858 enum { NETREG_UNINITIALIZED=0, 1859 NETREG_REGISTERED, /* completed register_netdevice */ 1860 NETREG_UNREGISTERING, /* called unregister_netdevice */ 1861 NETREG_UNREGISTERED, /* completed unregister todo */ 1862 NETREG_RELEASED, /* called free_netdev */ 1863 NETREG_DUMMY, /* dummy device for NAPI poll */ 1864 } reg_state:8; 1865 1866 bool dismantle; 1867 1868 enum { 1869 RTNL_LINK_INITIALIZED, 1870 RTNL_LINK_INITIALIZING, 1871 } rtnl_link_state:16; 1872 1873 bool needs_free_netdev; 1874 void (*priv_destructor)(struct net_device *dev); 1875 1876 #ifdef CONFIG_NETPOLL 1877 struct netpoll_info __rcu *npinfo; 1878 #endif 1879 1880 possible_net_t nd_net; 1881 1882 /* mid-layer private */ 1883 union { 1884 void *ml_priv; 1885 struct pcpu_lstats __percpu *lstats; 1886 struct pcpu_sw_netstats __percpu *tstats; 1887 struct pcpu_dstats __percpu *dstats; 1888 struct pcpu_vstats __percpu *vstats; 1889 }; 1890 1891 #if IS_ENABLED(CONFIG_GARP) 1892 struct garp_port __rcu *garp_port; 1893 #endif 1894 #if IS_ENABLED(CONFIG_MRP) 1895 struct mrp_port __rcu *mrp_port; 1896 #endif 1897 1898 struct device dev; 1899 const struct attribute_group *sysfs_groups[4]; 1900 const struct attribute_group *sysfs_rx_queue_group; 1901 1902 const struct rtnl_link_ops *rtnl_link_ops; 1903 1904 /* for setting kernel sock attribute on TCP connection setup */ 1905 #define GSO_MAX_SIZE 65536 1906 unsigned int gso_max_size; 1907 #define GSO_MAX_SEGS 65535 1908 u16 gso_max_segs; 1909 1910 #ifdef CONFIG_DCB 1911 const struct dcbnl_rtnl_ops *dcbnl_ops; 1912 #endif 1913 u8 num_tc; 1914 struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE]; 1915 u8 prio_tc_map[TC_BITMASK + 1]; 1916 1917 #if IS_ENABLED(CONFIG_FCOE) 1918 unsigned int fcoe_ddp_xid; 1919 #endif 1920 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) 1921 struct netprio_map __rcu *priomap; 1922 #endif 1923 struct phy_device *phydev; 1924 struct lock_class_key *qdisc_tx_busylock; 1925 struct lock_class_key *qdisc_running_key; 1926 bool proto_down; 1927 }; 1928 #define to_net_dev(d) container_of(d, struct net_device, dev) 1929 1930 static inline bool netif_elide_gro(const struct net_device *dev) 1931 { 1932 if (!(dev->features & NETIF_F_GRO) || dev->xdp_prog) 1933 return true; 1934 return false; 1935 } 1936 1937 #define NETDEV_ALIGN 32 1938 1939 static inline 1940 int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio) 1941 { 1942 return dev->prio_tc_map[prio & TC_BITMASK]; 1943 } 1944 1945 static inline 1946 int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc) 1947 { 1948 if (tc >= dev->num_tc) 1949 return -EINVAL; 1950 1951 dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK; 1952 return 0; 1953 } 1954 1955 int netdev_txq_to_tc(struct net_device *dev, unsigned int txq); 1956 void netdev_reset_tc(struct net_device *dev); 1957 int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset); 1958 int netdev_set_num_tc(struct net_device *dev, u8 num_tc); 1959 1960 static inline 1961 int netdev_get_num_tc(struct net_device *dev) 1962 { 1963 return dev->num_tc; 1964 } 1965 1966 static inline 1967 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev, 1968 unsigned int index) 1969 { 1970 return &dev->_tx[index]; 1971 } 1972 1973 static inline struct netdev_queue *skb_get_tx_queue(const struct net_device *dev, 1974 const struct sk_buff *skb) 1975 { 1976 return netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); 1977 } 1978 1979 static inline void netdev_for_each_tx_queue(struct net_device *dev, 1980 void (*f)(struct net_device *, 1981 struct netdev_queue *, 1982 void *), 1983 void *arg) 1984 { 1985 unsigned int i; 1986 1987 for (i = 0; i < dev->num_tx_queues; i++) 1988 f(dev, &dev->_tx[i], arg); 1989 } 1990 1991 #define netdev_lockdep_set_classes(dev) \ 1992 { \ 1993 static struct lock_class_key qdisc_tx_busylock_key; \ 1994 static struct lock_class_key qdisc_running_key; \ 1995 static struct lock_class_key qdisc_xmit_lock_key; \ 1996 static struct lock_class_key dev_addr_list_lock_key; \ 1997 unsigned int i; \ 1998 \ 1999 (dev)->qdisc_tx_busylock = &qdisc_tx_busylock_key; \ 2000 (dev)->qdisc_running_key = &qdisc_running_key; \ 2001 lockdep_set_class(&(dev)->addr_list_lock, \ 2002 &dev_addr_list_lock_key); \ 2003 for (i = 0; i < (dev)->num_tx_queues; i++) \ 2004 lockdep_set_class(&(dev)->_tx[i]._xmit_lock, \ 2005 &qdisc_xmit_lock_key); \ 2006 } 2007 2008 struct netdev_queue *netdev_pick_tx(struct net_device *dev, 2009 struct sk_buff *skb, 2010 void *accel_priv); 2011 2012 /* returns the headroom that the master device needs to take in account 2013 * when forwarding to this dev 2014 */ 2015 static inline unsigned netdev_get_fwd_headroom(struct net_device *dev) 2016 { 2017 return dev->priv_flags & IFF_PHONY_HEADROOM ? 0 : dev->needed_headroom; 2018 } 2019 2020 static inline void netdev_set_rx_headroom(struct net_device *dev, int new_hr) 2021 { 2022 if (dev->netdev_ops->ndo_set_rx_headroom) 2023 dev->netdev_ops->ndo_set_rx_headroom(dev, new_hr); 2024 } 2025 2026 /* set the device rx headroom to the dev's default */ 2027 static inline void netdev_reset_rx_headroom(struct net_device *dev) 2028 { 2029 netdev_set_rx_headroom(dev, -1); 2030 } 2031 2032 /* 2033 * Net namespace inlines 2034 */ 2035 static inline 2036 struct net *dev_net(const struct net_device *dev) 2037 { 2038 return read_pnet(&dev->nd_net); 2039 } 2040 2041 static inline 2042 void dev_net_set(struct net_device *dev, struct net *net) 2043 { 2044 write_pnet(&dev->nd_net, net); 2045 } 2046 2047 /** 2048 * netdev_priv - access network device private data 2049 * @dev: network device 2050 * 2051 * Get network device private data 2052 */ 2053 static inline void *netdev_priv(const struct net_device *dev) 2054 { 2055 return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN); 2056 } 2057 2058 /* Set the sysfs physical device reference for the network logical device 2059 * if set prior to registration will cause a symlink during initialization. 2060 */ 2061 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) 2062 2063 /* Set the sysfs device type for the network logical device to allow 2064 * fine-grained identification of different network device types. For 2065 * example Ethernet, Wireless LAN, Bluetooth, WiMAX etc. 2066 */ 2067 #define SET_NETDEV_DEVTYPE(net, devtype) ((net)->dev.type = (devtype)) 2068 2069 /* Default NAPI poll() weight 2070 * Device drivers are strongly advised to not use bigger value 2071 */ 2072 #define NAPI_POLL_WEIGHT 64 2073 2074 /** 2075 * netif_napi_add - initialize a NAPI context 2076 * @dev: network device 2077 * @napi: NAPI context 2078 * @poll: polling function 2079 * @weight: default weight 2080 * 2081 * netif_napi_add() must be used to initialize a NAPI context prior to calling 2082 * *any* of the other NAPI-related functions. 2083 */ 2084 void netif_napi_add(struct net_device *dev, struct napi_struct *napi, 2085 int (*poll)(struct napi_struct *, int), int weight); 2086 2087 /** 2088 * netif_tx_napi_add - initialize a NAPI context 2089 * @dev: network device 2090 * @napi: NAPI context 2091 * @poll: polling function 2092 * @weight: default weight 2093 * 2094 * This variant of netif_napi_add() should be used from drivers using NAPI 2095 * to exclusively poll a TX queue. 2096 * This will avoid we add it into napi_hash[], thus polluting this hash table. 2097 */ 2098 static inline void netif_tx_napi_add(struct net_device *dev, 2099 struct napi_struct *napi, 2100 int (*poll)(struct napi_struct *, int), 2101 int weight) 2102 { 2103 set_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state); 2104 netif_napi_add(dev, napi, poll, weight); 2105 } 2106 2107 /** 2108 * netif_napi_del - remove a NAPI context 2109 * @napi: NAPI context 2110 * 2111 * netif_napi_del() removes a NAPI context from the network device NAPI list 2112 */ 2113 void netif_napi_del(struct napi_struct *napi); 2114 2115 struct napi_gro_cb { 2116 /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */ 2117 void *frag0; 2118 2119 /* Length of frag0. */ 2120 unsigned int frag0_len; 2121 2122 /* This indicates where we are processing relative to skb->data. */ 2123 int data_offset; 2124 2125 /* This is non-zero if the packet cannot be merged with the new skb. */ 2126 u16 flush; 2127 2128 /* Save the IP ID here and check when we get to the transport layer */ 2129 u16 flush_id; 2130 2131 /* Number of segments aggregated. */ 2132 u16 count; 2133 2134 /* Start offset for remote checksum offload */ 2135 u16 gro_remcsum_start; 2136 2137 /* jiffies when first packet was created/queued */ 2138 unsigned long age; 2139 2140 /* Used in ipv6_gro_receive() and foo-over-udp */ 2141 u16 proto; 2142 2143 /* This is non-zero if the packet may be of the same flow. */ 2144 u8 same_flow:1; 2145 2146 /* Used in tunnel GRO receive */ 2147 u8 encap_mark:1; 2148 2149 /* GRO checksum is valid */ 2150 u8 csum_valid:1; 2151 2152 /* Number of checksums via CHECKSUM_UNNECESSARY */ 2153 u8 csum_cnt:3; 2154 2155 /* Free the skb? */ 2156 u8 free:2; 2157 #define NAPI_GRO_FREE 1 2158 #define NAPI_GRO_FREE_STOLEN_HEAD 2 2159 2160 /* Used in foo-over-udp, set in udp[46]_gro_receive */ 2161 u8 is_ipv6:1; 2162 2163 /* Used in GRE, set in fou/gue_gro_receive */ 2164 u8 is_fou:1; 2165 2166 /* Used to determine if flush_id can be ignored */ 2167 u8 is_atomic:1; 2168 2169 /* Number of gro_receive callbacks this packet already went through */ 2170 u8 recursion_counter:4; 2171 2172 /* 1 bit hole */ 2173 2174 /* used to support CHECKSUM_COMPLETE for tunneling protocols */ 2175 __wsum csum; 2176 2177 /* used in skb_gro_receive() slow path */ 2178 struct sk_buff *last; 2179 }; 2180 2181 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb) 2182 2183 #define GRO_RECURSION_LIMIT 15 2184 static inline int gro_recursion_inc_test(struct sk_buff *skb) 2185 { 2186 return ++NAPI_GRO_CB(skb)->recursion_counter == GRO_RECURSION_LIMIT; 2187 } 2188 2189 typedef struct sk_buff **(*gro_receive_t)(struct sk_buff **, struct sk_buff *); 2190 static inline struct sk_buff **call_gro_receive(gro_receive_t cb, 2191 struct sk_buff **head, 2192 struct sk_buff *skb) 2193 { 2194 if (unlikely(gro_recursion_inc_test(skb))) { 2195 NAPI_GRO_CB(skb)->flush |= 1; 2196 return NULL; 2197 } 2198 2199 return cb(head, skb); 2200 } 2201 2202 typedef struct sk_buff **(*gro_receive_sk_t)(struct sock *, struct sk_buff **, 2203 struct sk_buff *); 2204 static inline struct sk_buff **call_gro_receive_sk(gro_receive_sk_t cb, 2205 struct sock *sk, 2206 struct sk_buff **head, 2207 struct sk_buff *skb) 2208 { 2209 if (unlikely(gro_recursion_inc_test(skb))) { 2210 NAPI_GRO_CB(skb)->flush |= 1; 2211 return NULL; 2212 } 2213 2214 return cb(sk, head, skb); 2215 } 2216 2217 struct packet_type { 2218 __be16 type; /* This is really htons(ether_type). */ 2219 struct net_device *dev; /* NULL is wildcarded here */ 2220 int (*func) (struct sk_buff *, 2221 struct net_device *, 2222 struct packet_type *, 2223 struct net_device *); 2224 bool (*id_match)(struct packet_type *ptype, 2225 struct sock *sk); 2226 void *af_packet_priv; 2227 struct list_head list; 2228 }; 2229 2230 struct offload_callbacks { 2231 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 2232 netdev_features_t features); 2233 struct sk_buff **(*gro_receive)(struct sk_buff **head, 2234 struct sk_buff *skb); 2235 int (*gro_complete)(struct sk_buff *skb, int nhoff); 2236 }; 2237 2238 struct packet_offload { 2239 __be16 type; /* This is really htons(ether_type). */ 2240 u16 priority; 2241 struct offload_callbacks callbacks; 2242 struct list_head list; 2243 }; 2244 2245 /* often modified stats are per-CPU, other are shared (netdev->stats) */ 2246 struct pcpu_sw_netstats { 2247 u64 rx_packets; 2248 u64 rx_bytes; 2249 u64 tx_packets; 2250 u64 tx_bytes; 2251 struct u64_stats_sync syncp; 2252 }; 2253 2254 #define __netdev_alloc_pcpu_stats(type, gfp) \ 2255 ({ \ 2256 typeof(type) __percpu *pcpu_stats = alloc_percpu_gfp(type, gfp);\ 2257 if (pcpu_stats) { \ 2258 int __cpu; \ 2259 for_each_possible_cpu(__cpu) { \ 2260 typeof(type) *stat; \ 2261 stat = per_cpu_ptr(pcpu_stats, __cpu); \ 2262 u64_stats_init(&stat->syncp); \ 2263 } \ 2264 } \ 2265 pcpu_stats; \ 2266 }) 2267 2268 #define netdev_alloc_pcpu_stats(type) \ 2269 __netdev_alloc_pcpu_stats(type, GFP_KERNEL) 2270 2271 enum netdev_lag_tx_type { 2272 NETDEV_LAG_TX_TYPE_UNKNOWN, 2273 NETDEV_LAG_TX_TYPE_RANDOM, 2274 NETDEV_LAG_TX_TYPE_BROADCAST, 2275 NETDEV_LAG_TX_TYPE_ROUNDROBIN, 2276 NETDEV_LAG_TX_TYPE_ACTIVEBACKUP, 2277 NETDEV_LAG_TX_TYPE_HASH, 2278 }; 2279 2280 struct netdev_lag_upper_info { 2281 enum netdev_lag_tx_type tx_type; 2282 }; 2283 2284 struct netdev_lag_lower_state_info { 2285 u8 link_up : 1, 2286 tx_enabled : 1; 2287 }; 2288 2289 #include <linux/notifier.h> 2290 2291 /* netdevice notifier chain. Please remember to update the rtnetlink 2292 * notification exclusion list in rtnetlink_event() when adding new 2293 * types. 2294 */ 2295 #define NETDEV_UP 0x0001 /* For now you can't veto a device up/down */ 2296 #define NETDEV_DOWN 0x0002 2297 #define NETDEV_REBOOT 0x0003 /* Tell a protocol stack a network interface 2298 detected a hardware crash and restarted 2299 - we can use this eg to kick tcp sessions 2300 once done */ 2301 #define NETDEV_CHANGE 0x0004 /* Notify device state change */ 2302 #define NETDEV_REGISTER 0x0005 2303 #define NETDEV_UNREGISTER 0x0006 2304 #define NETDEV_CHANGEMTU 0x0007 /* notify after mtu change happened */ 2305 #define NETDEV_CHANGEADDR 0x0008 2306 #define NETDEV_GOING_DOWN 0x0009 2307 #define NETDEV_CHANGENAME 0x000A 2308 #define NETDEV_FEAT_CHANGE 0x000B 2309 #define NETDEV_BONDING_FAILOVER 0x000C 2310 #define NETDEV_PRE_UP 0x000D 2311 #define NETDEV_PRE_TYPE_CHANGE 0x000E 2312 #define NETDEV_POST_TYPE_CHANGE 0x000F 2313 #define NETDEV_POST_INIT 0x0010 2314 #define NETDEV_UNREGISTER_FINAL 0x0011 2315 #define NETDEV_RELEASE 0x0012 2316 #define NETDEV_NOTIFY_PEERS 0x0013 2317 #define NETDEV_JOIN 0x0014 2318 #define NETDEV_CHANGEUPPER 0x0015 2319 #define NETDEV_RESEND_IGMP 0x0016 2320 #define NETDEV_PRECHANGEMTU 0x0017 /* notify before mtu change happened */ 2321 #define NETDEV_CHANGEINFODATA 0x0018 2322 #define NETDEV_BONDING_INFO 0x0019 2323 #define NETDEV_PRECHANGEUPPER 0x001A 2324 #define NETDEV_CHANGELOWERSTATE 0x001B 2325 #define NETDEV_UDP_TUNNEL_PUSH_INFO 0x001C 2326 #define NETDEV_UDP_TUNNEL_DROP_INFO 0x001D 2327 #define NETDEV_CHANGE_TX_QUEUE_LEN 0x001E 2328 2329 int register_netdevice_notifier(struct notifier_block *nb); 2330 int unregister_netdevice_notifier(struct notifier_block *nb); 2331 2332 struct netdev_notifier_info { 2333 struct net_device *dev; 2334 struct netlink_ext_ack *extack; 2335 }; 2336 2337 struct netdev_notifier_change_info { 2338 struct netdev_notifier_info info; /* must be first */ 2339 unsigned int flags_changed; 2340 }; 2341 2342 struct netdev_notifier_changeupper_info { 2343 struct netdev_notifier_info info; /* must be first */ 2344 struct net_device *upper_dev; /* new upper dev */ 2345 bool master; /* is upper dev master */ 2346 bool linking; /* is the notification for link or unlink */ 2347 void *upper_info; /* upper dev info */ 2348 }; 2349 2350 struct netdev_notifier_changelowerstate_info { 2351 struct netdev_notifier_info info; /* must be first */ 2352 void *lower_state_info; /* is lower dev state */ 2353 }; 2354 2355 static inline void netdev_notifier_info_init(struct netdev_notifier_info *info, 2356 struct net_device *dev) 2357 { 2358 info->dev = dev; 2359 info->extack = NULL; 2360 } 2361 2362 static inline struct net_device * 2363 netdev_notifier_info_to_dev(const struct netdev_notifier_info *info) 2364 { 2365 return info->dev; 2366 } 2367 2368 static inline struct netlink_ext_ack * 2369 netdev_notifier_info_to_extack(const struct netdev_notifier_info *info) 2370 { 2371 return info->extack; 2372 } 2373 2374 int call_netdevice_notifiers(unsigned long val, struct net_device *dev); 2375 2376 2377 extern rwlock_t dev_base_lock; /* Device list lock */ 2378 2379 #define for_each_netdev(net, d) \ 2380 list_for_each_entry(d, &(net)->dev_base_head, dev_list) 2381 #define for_each_netdev_reverse(net, d) \ 2382 list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list) 2383 #define for_each_netdev_rcu(net, d) \ 2384 list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list) 2385 #define for_each_netdev_safe(net, d, n) \ 2386 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list) 2387 #define for_each_netdev_continue(net, d) \ 2388 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list) 2389 #define for_each_netdev_continue_rcu(net, d) \ 2390 list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list) 2391 #define for_each_netdev_in_bond_rcu(bond, slave) \ 2392 for_each_netdev_rcu(&init_net, slave) \ 2393 if (netdev_master_upper_dev_get_rcu(slave) == (bond)) 2394 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) 2395 2396 static inline struct net_device *next_net_device(struct net_device *dev) 2397 { 2398 struct list_head *lh; 2399 struct net *net; 2400 2401 net = dev_net(dev); 2402 lh = dev->dev_list.next; 2403 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 2404 } 2405 2406 static inline struct net_device *next_net_device_rcu(struct net_device *dev) 2407 { 2408 struct list_head *lh; 2409 struct net *net; 2410 2411 net = dev_net(dev); 2412 lh = rcu_dereference(list_next_rcu(&dev->dev_list)); 2413 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 2414 } 2415 2416 static inline struct net_device *first_net_device(struct net *net) 2417 { 2418 return list_empty(&net->dev_base_head) ? NULL : 2419 net_device_entry(net->dev_base_head.next); 2420 } 2421 2422 static inline struct net_device *first_net_device_rcu(struct net *net) 2423 { 2424 struct list_head *lh = rcu_dereference(list_next_rcu(&net->dev_base_head)); 2425 2426 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 2427 } 2428 2429 int netdev_boot_setup_check(struct net_device *dev); 2430 unsigned long netdev_boot_base(const char *prefix, int unit); 2431 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, 2432 const char *hwaddr); 2433 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type); 2434 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type); 2435 void dev_add_pack(struct packet_type *pt); 2436 void dev_remove_pack(struct packet_type *pt); 2437 void __dev_remove_pack(struct packet_type *pt); 2438 void dev_add_offload(struct packet_offload *po); 2439 void dev_remove_offload(struct packet_offload *po); 2440 2441 int dev_get_iflink(const struct net_device *dev); 2442 int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb); 2443 struct net_device *__dev_get_by_flags(struct net *net, unsigned short flags, 2444 unsigned short mask); 2445 struct net_device *dev_get_by_name(struct net *net, const char *name); 2446 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name); 2447 struct net_device *__dev_get_by_name(struct net *net, const char *name); 2448 int dev_alloc_name(struct net_device *dev, const char *name); 2449 int dev_open(struct net_device *dev); 2450 void dev_close(struct net_device *dev); 2451 void dev_close_many(struct list_head *head, bool unlink); 2452 void dev_disable_lro(struct net_device *dev); 2453 int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *newskb); 2454 int dev_queue_xmit(struct sk_buff *skb); 2455 int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv); 2456 int register_netdevice(struct net_device *dev); 2457 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head); 2458 void unregister_netdevice_many(struct list_head *head); 2459 static inline void unregister_netdevice(struct net_device *dev) 2460 { 2461 unregister_netdevice_queue(dev, NULL); 2462 } 2463 2464 int netdev_refcnt_read(const struct net_device *dev); 2465 void free_netdev(struct net_device *dev); 2466 void netdev_freemem(struct net_device *dev); 2467 void synchronize_net(void); 2468 int init_dummy_netdev(struct net_device *dev); 2469 2470 DECLARE_PER_CPU(int, xmit_recursion); 2471 #define XMIT_RECURSION_LIMIT 10 2472 2473 static inline int dev_recursion_level(void) 2474 { 2475 return this_cpu_read(xmit_recursion); 2476 } 2477 2478 struct net_device *dev_get_by_index(struct net *net, int ifindex); 2479 struct net_device *__dev_get_by_index(struct net *net, int ifindex); 2480 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex); 2481 struct net_device *dev_get_by_napi_id(unsigned int napi_id); 2482 int netdev_get_name(struct net *net, char *name, int ifindex); 2483 int dev_restart(struct net_device *dev); 2484 int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb); 2485 2486 static inline unsigned int skb_gro_offset(const struct sk_buff *skb) 2487 { 2488 return NAPI_GRO_CB(skb)->data_offset; 2489 } 2490 2491 static inline unsigned int skb_gro_len(const struct sk_buff *skb) 2492 { 2493 return skb->len - NAPI_GRO_CB(skb)->data_offset; 2494 } 2495 2496 static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len) 2497 { 2498 NAPI_GRO_CB(skb)->data_offset += len; 2499 } 2500 2501 static inline void *skb_gro_header_fast(struct sk_buff *skb, 2502 unsigned int offset) 2503 { 2504 return NAPI_GRO_CB(skb)->frag0 + offset; 2505 } 2506 2507 static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen) 2508 { 2509 return NAPI_GRO_CB(skb)->frag0_len < hlen; 2510 } 2511 2512 static inline void skb_gro_frag0_invalidate(struct sk_buff *skb) 2513 { 2514 NAPI_GRO_CB(skb)->frag0 = NULL; 2515 NAPI_GRO_CB(skb)->frag0_len = 0; 2516 } 2517 2518 static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen, 2519 unsigned int offset) 2520 { 2521 if (!pskb_may_pull(skb, hlen)) 2522 return NULL; 2523 2524 skb_gro_frag0_invalidate(skb); 2525 return skb->data + offset; 2526 } 2527 2528 static inline void *skb_gro_network_header(struct sk_buff *skb) 2529 { 2530 return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) + 2531 skb_network_offset(skb); 2532 } 2533 2534 static inline void skb_gro_postpull_rcsum(struct sk_buff *skb, 2535 const void *start, unsigned int len) 2536 { 2537 if (NAPI_GRO_CB(skb)->csum_valid) 2538 NAPI_GRO_CB(skb)->csum = csum_sub(NAPI_GRO_CB(skb)->csum, 2539 csum_partial(start, len, 0)); 2540 } 2541 2542 /* GRO checksum functions. These are logical equivalents of the normal 2543 * checksum functions (in skbuff.h) except that they operate on the GRO 2544 * offsets and fields in sk_buff. 2545 */ 2546 2547 __sum16 __skb_gro_checksum_complete(struct sk_buff *skb); 2548 2549 static inline bool skb_at_gro_remcsum_start(struct sk_buff *skb) 2550 { 2551 return (NAPI_GRO_CB(skb)->gro_remcsum_start == skb_gro_offset(skb)); 2552 } 2553 2554 static inline bool __skb_gro_checksum_validate_needed(struct sk_buff *skb, 2555 bool zero_okay, 2556 __sum16 check) 2557 { 2558 return ((skb->ip_summed != CHECKSUM_PARTIAL || 2559 skb_checksum_start_offset(skb) < 2560 skb_gro_offset(skb)) && 2561 !skb_at_gro_remcsum_start(skb) && 2562 NAPI_GRO_CB(skb)->csum_cnt == 0 && 2563 (!zero_okay || check)); 2564 } 2565 2566 static inline __sum16 __skb_gro_checksum_validate_complete(struct sk_buff *skb, 2567 __wsum psum) 2568 { 2569 if (NAPI_GRO_CB(skb)->csum_valid && 2570 !csum_fold(csum_add(psum, NAPI_GRO_CB(skb)->csum))) 2571 return 0; 2572 2573 NAPI_GRO_CB(skb)->csum = psum; 2574 2575 return __skb_gro_checksum_complete(skb); 2576 } 2577 2578 static inline void skb_gro_incr_csum_unnecessary(struct sk_buff *skb) 2579 { 2580 if (NAPI_GRO_CB(skb)->csum_cnt > 0) { 2581 /* Consume a checksum from CHECKSUM_UNNECESSARY */ 2582 NAPI_GRO_CB(skb)->csum_cnt--; 2583 } else { 2584 /* Update skb for CHECKSUM_UNNECESSARY and csum_level when we 2585 * verified a new top level checksum or an encapsulated one 2586 * during GRO. This saves work if we fallback to normal path. 2587 */ 2588 __skb_incr_checksum_unnecessary(skb); 2589 } 2590 } 2591 2592 #define __skb_gro_checksum_validate(skb, proto, zero_okay, check, \ 2593 compute_pseudo) \ 2594 ({ \ 2595 __sum16 __ret = 0; \ 2596 if (__skb_gro_checksum_validate_needed(skb, zero_okay, check)) \ 2597 __ret = __skb_gro_checksum_validate_complete(skb, \ 2598 compute_pseudo(skb, proto)); \ 2599 if (!__ret) \ 2600 skb_gro_incr_csum_unnecessary(skb); \ 2601 __ret; \ 2602 }) 2603 2604 #define skb_gro_checksum_validate(skb, proto, compute_pseudo) \ 2605 __skb_gro_checksum_validate(skb, proto, false, 0, compute_pseudo) 2606 2607 #define skb_gro_checksum_validate_zero_check(skb, proto, check, \ 2608 compute_pseudo) \ 2609 __skb_gro_checksum_validate(skb, proto, true, check, compute_pseudo) 2610 2611 #define skb_gro_checksum_simple_validate(skb) \ 2612 __skb_gro_checksum_validate(skb, 0, false, 0, null_compute_pseudo) 2613 2614 static inline bool __skb_gro_checksum_convert_check(struct sk_buff *skb) 2615 { 2616 return (NAPI_GRO_CB(skb)->csum_cnt == 0 && 2617 !NAPI_GRO_CB(skb)->csum_valid); 2618 } 2619 2620 static inline void __skb_gro_checksum_convert(struct sk_buff *skb, 2621 __sum16 check, __wsum pseudo) 2622 { 2623 NAPI_GRO_CB(skb)->csum = ~pseudo; 2624 NAPI_GRO_CB(skb)->csum_valid = 1; 2625 } 2626 2627 #define skb_gro_checksum_try_convert(skb, proto, check, compute_pseudo) \ 2628 do { \ 2629 if (__skb_gro_checksum_convert_check(skb)) \ 2630 __skb_gro_checksum_convert(skb, check, \ 2631 compute_pseudo(skb, proto)); \ 2632 } while (0) 2633 2634 struct gro_remcsum { 2635 int offset; 2636 __wsum delta; 2637 }; 2638 2639 static inline void skb_gro_remcsum_init(struct gro_remcsum *grc) 2640 { 2641 grc->offset = 0; 2642 grc->delta = 0; 2643 } 2644 2645 static inline void *skb_gro_remcsum_process(struct sk_buff *skb, void *ptr, 2646 unsigned int off, size_t hdrlen, 2647 int start, int offset, 2648 struct gro_remcsum *grc, 2649 bool nopartial) 2650 { 2651 __wsum delta; 2652 size_t plen = hdrlen + max_t(size_t, offset + sizeof(u16), start); 2653 2654 BUG_ON(!NAPI_GRO_CB(skb)->csum_valid); 2655 2656 if (!nopartial) { 2657 NAPI_GRO_CB(skb)->gro_remcsum_start = off + hdrlen + start; 2658 return ptr; 2659 } 2660 2661 ptr = skb_gro_header_fast(skb, off); 2662 if (skb_gro_header_hard(skb, off + plen)) { 2663 ptr = skb_gro_header_slow(skb, off + plen, off); 2664 if (!ptr) 2665 return NULL; 2666 } 2667 2668 delta = remcsum_adjust(ptr + hdrlen, NAPI_GRO_CB(skb)->csum, 2669 start, offset); 2670 2671 /* Adjust skb->csum since we changed the packet */ 2672 NAPI_GRO_CB(skb)->csum = csum_add(NAPI_GRO_CB(skb)->csum, delta); 2673 2674 grc->offset = off + hdrlen + offset; 2675 grc->delta = delta; 2676 2677 return ptr; 2678 } 2679 2680 static inline void skb_gro_remcsum_cleanup(struct sk_buff *skb, 2681 struct gro_remcsum *grc) 2682 { 2683 void *ptr; 2684 size_t plen = grc->offset + sizeof(u16); 2685 2686 if (!grc->delta) 2687 return; 2688 2689 ptr = skb_gro_header_fast(skb, grc->offset); 2690 if (skb_gro_header_hard(skb, grc->offset + sizeof(u16))) { 2691 ptr = skb_gro_header_slow(skb, plen, grc->offset); 2692 if (!ptr) 2693 return; 2694 } 2695 2696 remcsum_unadjust((__sum16 *)ptr, grc->delta); 2697 } 2698 2699 #ifdef CONFIG_XFRM_OFFLOAD 2700 static inline void skb_gro_flush_final(struct sk_buff *skb, struct sk_buff **pp, int flush) 2701 { 2702 if (PTR_ERR(pp) != -EINPROGRESS) 2703 NAPI_GRO_CB(skb)->flush |= flush; 2704 } 2705 #else 2706 static inline void skb_gro_flush_final(struct sk_buff *skb, struct sk_buff **pp, int flush) 2707 { 2708 NAPI_GRO_CB(skb)->flush |= flush; 2709 } 2710 #endif 2711 2712 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, 2713 unsigned short type, 2714 const void *daddr, const void *saddr, 2715 unsigned int len) 2716 { 2717 if (!dev->header_ops || !dev->header_ops->create) 2718 return 0; 2719 2720 return dev->header_ops->create(skb, dev, type, daddr, saddr, len); 2721 } 2722 2723 static inline int dev_parse_header(const struct sk_buff *skb, 2724 unsigned char *haddr) 2725 { 2726 const struct net_device *dev = skb->dev; 2727 2728 if (!dev->header_ops || !dev->header_ops->parse) 2729 return 0; 2730 return dev->header_ops->parse(skb, haddr); 2731 } 2732 2733 /* ll_header must have at least hard_header_len allocated */ 2734 static inline bool dev_validate_header(const struct net_device *dev, 2735 char *ll_header, int len) 2736 { 2737 if (likely(len >= dev->hard_header_len)) 2738 return true; 2739 if (len < dev->min_header_len) 2740 return false; 2741 2742 if (capable(CAP_SYS_RAWIO)) { 2743 memset(ll_header + len, 0, dev->hard_header_len - len); 2744 return true; 2745 } 2746 2747 if (dev->header_ops && dev->header_ops->validate) 2748 return dev->header_ops->validate(ll_header, len); 2749 2750 return false; 2751 } 2752 2753 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 2754 int register_gifconf(unsigned int family, gifconf_func_t *gifconf); 2755 static inline int unregister_gifconf(unsigned int family) 2756 { 2757 return register_gifconf(family, NULL); 2758 } 2759 2760 #ifdef CONFIG_NET_FLOW_LIMIT 2761 #define FLOW_LIMIT_HISTORY (1 << 7) /* must be ^2 and !overflow buckets */ 2762 struct sd_flow_limit { 2763 u64 count; 2764 unsigned int num_buckets; 2765 unsigned int history_head; 2766 u16 history[FLOW_LIMIT_HISTORY]; 2767 u8 buckets[]; 2768 }; 2769 2770 extern int netdev_flow_limit_table_len; 2771 #endif /* CONFIG_NET_FLOW_LIMIT */ 2772 2773 /* 2774 * Incoming packets are placed on per-CPU queues 2775 */ 2776 struct softnet_data { 2777 struct list_head poll_list; 2778 struct sk_buff_head process_queue; 2779 2780 /* stats */ 2781 unsigned int processed; 2782 unsigned int time_squeeze; 2783 unsigned int received_rps; 2784 #ifdef CONFIG_RPS 2785 struct softnet_data *rps_ipi_list; 2786 #endif 2787 #ifdef CONFIG_NET_FLOW_LIMIT 2788 struct sd_flow_limit __rcu *flow_limit; 2789 #endif 2790 struct Qdisc *output_queue; 2791 struct Qdisc **output_queue_tailp; 2792 struct sk_buff *completion_queue; 2793 2794 #ifdef CONFIG_RPS 2795 /* input_queue_head should be written by cpu owning this struct, 2796 * and only read by other cpus. Worth using a cache line. 2797 */ 2798 unsigned int input_queue_head ____cacheline_aligned_in_smp; 2799 2800 /* Elements below can be accessed between CPUs for RPS/RFS */ 2801 call_single_data_t csd ____cacheline_aligned_in_smp; 2802 struct softnet_data *rps_ipi_next; 2803 unsigned int cpu; 2804 unsigned int input_queue_tail; 2805 #endif 2806 unsigned int dropped; 2807 struct sk_buff_head input_pkt_queue; 2808 struct napi_struct backlog; 2809 2810 }; 2811 2812 static inline void input_queue_head_incr(struct softnet_data *sd) 2813 { 2814 #ifdef CONFIG_RPS 2815 sd->input_queue_head++; 2816 #endif 2817 } 2818 2819 static inline void input_queue_tail_incr_save(struct softnet_data *sd, 2820 unsigned int *qtail) 2821 { 2822 #ifdef CONFIG_RPS 2823 *qtail = ++sd->input_queue_tail; 2824 #endif 2825 } 2826 2827 DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); 2828 2829 void __netif_schedule(struct Qdisc *q); 2830 void netif_schedule_queue(struct netdev_queue *txq); 2831 2832 static inline void netif_tx_schedule_all(struct net_device *dev) 2833 { 2834 unsigned int i; 2835 2836 for (i = 0; i < dev->num_tx_queues; i++) 2837 netif_schedule_queue(netdev_get_tx_queue(dev, i)); 2838 } 2839 2840 static __always_inline void netif_tx_start_queue(struct netdev_queue *dev_queue) 2841 { 2842 clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state); 2843 } 2844 2845 /** 2846 * netif_start_queue - allow transmit 2847 * @dev: network device 2848 * 2849 * Allow upper layers to call the device hard_start_xmit routine. 2850 */ 2851 static inline void netif_start_queue(struct net_device *dev) 2852 { 2853 netif_tx_start_queue(netdev_get_tx_queue(dev, 0)); 2854 } 2855 2856 static inline void netif_tx_start_all_queues(struct net_device *dev) 2857 { 2858 unsigned int i; 2859 2860 for (i = 0; i < dev->num_tx_queues; i++) { 2861 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 2862 netif_tx_start_queue(txq); 2863 } 2864 } 2865 2866 void netif_tx_wake_queue(struct netdev_queue *dev_queue); 2867 2868 /** 2869 * netif_wake_queue - restart transmit 2870 * @dev: network device 2871 * 2872 * Allow upper layers to call the device hard_start_xmit routine. 2873 * Used for flow control when transmit resources are available. 2874 */ 2875 static inline void netif_wake_queue(struct net_device *dev) 2876 { 2877 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0)); 2878 } 2879 2880 static inline void netif_tx_wake_all_queues(struct net_device *dev) 2881 { 2882 unsigned int i; 2883 2884 for (i = 0; i < dev->num_tx_queues; i++) { 2885 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 2886 netif_tx_wake_queue(txq); 2887 } 2888 } 2889 2890 static __always_inline void netif_tx_stop_queue(struct netdev_queue *dev_queue) 2891 { 2892 set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state); 2893 } 2894 2895 /** 2896 * netif_stop_queue - stop transmitted packets 2897 * @dev: network device 2898 * 2899 * Stop upper layers calling the device hard_start_xmit routine. 2900 * Used for flow control when transmit resources are unavailable. 2901 */ 2902 static inline void netif_stop_queue(struct net_device *dev) 2903 { 2904 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0)); 2905 } 2906 2907 void netif_tx_stop_all_queues(struct net_device *dev); 2908 2909 static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue) 2910 { 2911 return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state); 2912 } 2913 2914 /** 2915 * netif_queue_stopped - test if transmit queue is flowblocked 2916 * @dev: network device 2917 * 2918 * Test if transmit queue on device is currently unable to send. 2919 */ 2920 static inline bool netif_queue_stopped(const struct net_device *dev) 2921 { 2922 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0)); 2923 } 2924 2925 static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue) 2926 { 2927 return dev_queue->state & QUEUE_STATE_ANY_XOFF; 2928 } 2929 2930 static inline bool 2931 netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue) 2932 { 2933 return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN; 2934 } 2935 2936 static inline bool 2937 netif_xmit_frozen_or_drv_stopped(const struct netdev_queue *dev_queue) 2938 { 2939 return dev_queue->state & QUEUE_STATE_DRV_XOFF_OR_FROZEN; 2940 } 2941 2942 /** 2943 * netdev_txq_bql_enqueue_prefetchw - prefetch bql data for write 2944 * @dev_queue: pointer to transmit queue 2945 * 2946 * BQL enabled drivers might use this helper in their ndo_start_xmit(), 2947 * to give appropriate hint to the CPU. 2948 */ 2949 static inline void netdev_txq_bql_enqueue_prefetchw(struct netdev_queue *dev_queue) 2950 { 2951 #ifdef CONFIG_BQL 2952 prefetchw(&dev_queue->dql.num_queued); 2953 #endif 2954 } 2955 2956 /** 2957 * netdev_txq_bql_complete_prefetchw - prefetch bql data for write 2958 * @dev_queue: pointer to transmit queue 2959 * 2960 * BQL enabled drivers might use this helper in their TX completion path, 2961 * to give appropriate hint to the CPU. 2962 */ 2963 static inline void netdev_txq_bql_complete_prefetchw(struct netdev_queue *dev_queue) 2964 { 2965 #ifdef CONFIG_BQL 2966 prefetchw(&dev_queue->dql.limit); 2967 #endif 2968 } 2969 2970 static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue, 2971 unsigned int bytes) 2972 { 2973 #ifdef CONFIG_BQL 2974 dql_queued(&dev_queue->dql, bytes); 2975 2976 if (likely(dql_avail(&dev_queue->dql) >= 0)) 2977 return; 2978 2979 set_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state); 2980 2981 /* 2982 * The XOFF flag must be set before checking the dql_avail below, 2983 * because in netdev_tx_completed_queue we update the dql_completed 2984 * before checking the XOFF flag. 2985 */ 2986 smp_mb(); 2987 2988 /* check again in case another CPU has just made room avail */ 2989 if (unlikely(dql_avail(&dev_queue->dql) >= 0)) 2990 clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state); 2991 #endif 2992 } 2993 2994 /** 2995 * netdev_sent_queue - report the number of bytes queued to hardware 2996 * @dev: network device 2997 * @bytes: number of bytes queued to the hardware device queue 2998 * 2999 * Report the number of bytes queued for sending/completion to the network 3000 * device hardware queue. @bytes should be a good approximation and should 3001 * exactly match netdev_completed_queue() @bytes 3002 */ 3003 static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes) 3004 { 3005 netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes); 3006 } 3007 3008 static inline void netdev_tx_completed_queue(struct netdev_queue *dev_queue, 3009 unsigned int pkts, unsigned int bytes) 3010 { 3011 #ifdef CONFIG_BQL 3012 if (unlikely(!bytes)) 3013 return; 3014 3015 dql_completed(&dev_queue->dql, bytes); 3016 3017 /* 3018 * Without the memory barrier there is a small possiblity that 3019 * netdev_tx_sent_queue will miss the update and cause the queue to 3020 * be stopped forever 3021 */ 3022 smp_mb(); 3023 3024 if (dql_avail(&dev_queue->dql) < 0) 3025 return; 3026 3027 if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state)) 3028 netif_schedule_queue(dev_queue); 3029 #endif 3030 } 3031 3032 /** 3033 * netdev_completed_queue - report bytes and packets completed by device 3034 * @dev: network device 3035 * @pkts: actual number of packets sent over the medium 3036 * @bytes: actual number of bytes sent over the medium 3037 * 3038 * Report the number of bytes and packets transmitted by the network device 3039 * hardware queue over the physical medium, @bytes must exactly match the 3040 * @bytes amount passed to netdev_sent_queue() 3041 */ 3042 static inline void netdev_completed_queue(struct net_device *dev, 3043 unsigned int pkts, unsigned int bytes) 3044 { 3045 netdev_tx_completed_queue(netdev_get_tx_queue(dev, 0), pkts, bytes); 3046 } 3047 3048 static inline void netdev_tx_reset_queue(struct netdev_queue *q) 3049 { 3050 #ifdef CONFIG_BQL 3051 clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state); 3052 dql_reset(&q->dql); 3053 #endif 3054 } 3055 3056 /** 3057 * netdev_reset_queue - reset the packets and bytes count of a network device 3058 * @dev_queue: network device 3059 * 3060 * Reset the bytes and packet count of a network device and clear the 3061 * software flow control OFF bit for this network device 3062 */ 3063 static inline void netdev_reset_queue(struct net_device *dev_queue) 3064 { 3065 netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0)); 3066 } 3067 3068 /** 3069 * netdev_cap_txqueue - check if selected tx queue exceeds device queues 3070 * @dev: network device 3071 * @queue_index: given tx queue index 3072 * 3073 * Returns 0 if given tx queue index >= number of device tx queues, 3074 * otherwise returns the originally passed tx queue index. 3075 */ 3076 static inline u16 netdev_cap_txqueue(struct net_device *dev, u16 queue_index) 3077 { 3078 if (unlikely(queue_index >= dev->real_num_tx_queues)) { 3079 net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n", 3080 dev->name, queue_index, 3081 dev->real_num_tx_queues); 3082 return 0; 3083 } 3084 3085 return queue_index; 3086 } 3087 3088 /** 3089 * netif_running - test if up 3090 * @dev: network device 3091 * 3092 * Test if the device has been brought up. 3093 */ 3094 static inline bool netif_running(const struct net_device *dev) 3095 { 3096 return test_bit(__LINK_STATE_START, &dev->state); 3097 } 3098 3099 /* 3100 * Routines to manage the subqueues on a device. We only need start, 3101 * stop, and a check if it's stopped. All other device management is 3102 * done at the overall netdevice level. 3103 * Also test the device if we're multiqueue. 3104 */ 3105 3106 /** 3107 * netif_start_subqueue - allow sending packets on subqueue 3108 * @dev: network device 3109 * @queue_index: sub queue index 3110 * 3111 * Start individual transmit queue of a device with multiple transmit queues. 3112 */ 3113 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 3114 { 3115 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 3116 3117 netif_tx_start_queue(txq); 3118 } 3119 3120 /** 3121 * netif_stop_subqueue - stop sending packets on subqueue 3122 * @dev: network device 3123 * @queue_index: sub queue index 3124 * 3125 * Stop individual transmit queue of a device with multiple transmit queues. 3126 */ 3127 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 3128 { 3129 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 3130 netif_tx_stop_queue(txq); 3131 } 3132 3133 /** 3134 * netif_subqueue_stopped - test status of subqueue 3135 * @dev: network device 3136 * @queue_index: sub queue index 3137 * 3138 * Check individual transmit queue of a device with multiple transmit queues. 3139 */ 3140 static inline bool __netif_subqueue_stopped(const struct net_device *dev, 3141 u16 queue_index) 3142 { 3143 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 3144 3145 return netif_tx_queue_stopped(txq); 3146 } 3147 3148 static inline bool netif_subqueue_stopped(const struct net_device *dev, 3149 struct sk_buff *skb) 3150 { 3151 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb)); 3152 } 3153 3154 /** 3155 * netif_wake_subqueue - allow sending packets on subqueue 3156 * @dev: network device 3157 * @queue_index: sub queue index 3158 * 3159 * Resume individual transmit queue of a device with multiple transmit queues. 3160 */ 3161 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 3162 { 3163 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 3164 3165 netif_tx_wake_queue(txq); 3166 } 3167 3168 #ifdef CONFIG_XPS 3169 int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask, 3170 u16 index); 3171 #else 3172 static inline int netif_set_xps_queue(struct net_device *dev, 3173 const struct cpumask *mask, 3174 u16 index) 3175 { 3176 return 0; 3177 } 3178 #endif 3179 3180 u16 __skb_tx_hash(const struct net_device *dev, struct sk_buff *skb, 3181 unsigned int num_tx_queues); 3182 3183 /* 3184 * Returns a Tx hash for the given packet when dev->real_num_tx_queues is used 3185 * as a distribution range limit for the returned value. 3186 */ 3187 static inline u16 skb_tx_hash(const struct net_device *dev, 3188 struct sk_buff *skb) 3189 { 3190 return __skb_tx_hash(dev, skb, dev->real_num_tx_queues); 3191 } 3192 3193 /** 3194 * netif_is_multiqueue - test if device has multiple transmit queues 3195 * @dev: network device 3196 * 3197 * Check if device has multiple transmit queues 3198 */ 3199 static inline bool netif_is_multiqueue(const struct net_device *dev) 3200 { 3201 return dev->num_tx_queues > 1; 3202 } 3203 3204 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq); 3205 3206 #ifdef CONFIG_SYSFS 3207 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq); 3208 #else 3209 static inline int netif_set_real_num_rx_queues(struct net_device *dev, 3210 unsigned int rxq) 3211 { 3212 return 0; 3213 } 3214 #endif 3215 3216 #ifdef CONFIG_SYSFS 3217 static inline unsigned int get_netdev_rx_queue_index( 3218 struct netdev_rx_queue *queue) 3219 { 3220 struct net_device *dev = queue->dev; 3221 int index = queue - dev->_rx; 3222 3223 BUG_ON(index >= dev->num_rx_queues); 3224 return index; 3225 } 3226 #endif 3227 3228 #define DEFAULT_MAX_NUM_RSS_QUEUES (8) 3229 int netif_get_num_default_rss_queues(void); 3230 3231 enum skb_free_reason { 3232 SKB_REASON_CONSUMED, 3233 SKB_REASON_DROPPED, 3234 }; 3235 3236 void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason); 3237 void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason); 3238 3239 /* 3240 * It is not allowed to call kfree_skb() or consume_skb() from hardware 3241 * interrupt context or with hardware interrupts being disabled. 3242 * (in_irq() || irqs_disabled()) 3243 * 3244 * We provide four helpers that can be used in following contexts : 3245 * 3246 * dev_kfree_skb_irq(skb) when caller drops a packet from irq context, 3247 * replacing kfree_skb(skb) 3248 * 3249 * dev_consume_skb_irq(skb) when caller consumes a packet from irq context. 3250 * Typically used in place of consume_skb(skb) in TX completion path 3251 * 3252 * dev_kfree_skb_any(skb) when caller doesn't know its current irq context, 3253 * replacing kfree_skb(skb) 3254 * 3255 * dev_consume_skb_any(skb) when caller doesn't know its current irq context, 3256 * and consumed a packet. Used in place of consume_skb(skb) 3257 */ 3258 static inline void dev_kfree_skb_irq(struct sk_buff *skb) 3259 { 3260 __dev_kfree_skb_irq(skb, SKB_REASON_DROPPED); 3261 } 3262 3263 static inline void dev_consume_skb_irq(struct sk_buff *skb) 3264 { 3265 __dev_kfree_skb_irq(skb, SKB_REASON_CONSUMED); 3266 } 3267 3268 static inline void dev_kfree_skb_any(struct sk_buff *skb) 3269 { 3270 __dev_kfree_skb_any(skb, SKB_REASON_DROPPED); 3271 } 3272 3273 static inline void dev_consume_skb_any(struct sk_buff *skb) 3274 { 3275 __dev_kfree_skb_any(skb, SKB_REASON_CONSUMED); 3276 } 3277 3278 void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog); 3279 int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb); 3280 int netif_rx(struct sk_buff *skb); 3281 int netif_rx_ni(struct sk_buff *skb); 3282 int netif_receive_skb(struct sk_buff *skb); 3283 int netif_receive_skb_core(struct sk_buff *skb); 3284 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb); 3285 void napi_gro_flush(struct napi_struct *napi, bool flush_old); 3286 struct sk_buff *napi_get_frags(struct napi_struct *napi); 3287 gro_result_t napi_gro_frags(struct napi_struct *napi); 3288 struct packet_offload *gro_find_receive_by_type(__be16 type); 3289 struct packet_offload *gro_find_complete_by_type(__be16 type); 3290 3291 static inline void napi_free_frags(struct napi_struct *napi) 3292 { 3293 kfree_skb(napi->skb); 3294 napi->skb = NULL; 3295 } 3296 3297 bool netdev_is_rx_handler_busy(struct net_device *dev); 3298 int netdev_rx_handler_register(struct net_device *dev, 3299 rx_handler_func_t *rx_handler, 3300 void *rx_handler_data); 3301 void netdev_rx_handler_unregister(struct net_device *dev); 3302 3303 bool dev_valid_name(const char *name); 3304 int dev_ioctl(struct net *net, unsigned int cmd, void __user *); 3305 int dev_ethtool(struct net *net, struct ifreq *); 3306 unsigned int dev_get_flags(const struct net_device *); 3307 int __dev_change_flags(struct net_device *, unsigned int flags); 3308 int dev_change_flags(struct net_device *, unsigned int); 3309 void __dev_notify_flags(struct net_device *, unsigned int old_flags, 3310 unsigned int gchanges); 3311 int dev_change_name(struct net_device *, const char *); 3312 int dev_set_alias(struct net_device *, const char *, size_t); 3313 int dev_get_alias(const struct net_device *, char *, size_t); 3314 int dev_change_net_namespace(struct net_device *, struct net *, const char *); 3315 int __dev_set_mtu(struct net_device *, int); 3316 int dev_set_mtu(struct net_device *, int); 3317 void dev_set_group(struct net_device *, int); 3318 int dev_set_mac_address(struct net_device *, struct sockaddr *); 3319 int dev_change_carrier(struct net_device *, bool new_carrier); 3320 int dev_get_phys_port_id(struct net_device *dev, 3321 struct netdev_phys_item_id *ppid); 3322 int dev_get_phys_port_name(struct net_device *dev, 3323 char *name, size_t len); 3324 int dev_change_proto_down(struct net_device *dev, bool proto_down); 3325 struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev); 3326 struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, 3327 struct netdev_queue *txq, int *ret); 3328 3329 typedef int (*bpf_op_t)(struct net_device *dev, struct netdev_bpf *bpf); 3330 int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack, 3331 int fd, u32 flags); 3332 u8 __dev_xdp_attached(struct net_device *dev, bpf_op_t xdp_op, u32 *prog_id); 3333 3334 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb); 3335 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb); 3336 bool is_skb_forwardable(const struct net_device *dev, 3337 const struct sk_buff *skb); 3338 3339 static __always_inline int ____dev_forward_skb(struct net_device *dev, 3340 struct sk_buff *skb) 3341 { 3342 if (skb_orphan_frags(skb, GFP_ATOMIC) || 3343 unlikely(!is_skb_forwardable(dev, skb))) { 3344 atomic_long_inc(&dev->rx_dropped); 3345 kfree_skb(skb); 3346 return NET_RX_DROP; 3347 } 3348 3349 skb_scrub_packet(skb, true); 3350 skb->priority = 0; 3351 return 0; 3352 } 3353 3354 void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev); 3355 3356 extern int netdev_budget; 3357 extern unsigned int netdev_budget_usecs; 3358 3359 /* Called by rtnetlink.c:rtnl_unlock() */ 3360 void netdev_run_todo(void); 3361 3362 /** 3363 * dev_put - release reference to device 3364 * @dev: network device 3365 * 3366 * Release reference to device to allow it to be freed. 3367 */ 3368 static inline void dev_put(struct net_device *dev) 3369 { 3370 this_cpu_dec(*dev->pcpu_refcnt); 3371 } 3372 3373 /** 3374 * dev_hold - get reference to device 3375 * @dev: network device 3376 * 3377 * Hold reference to device to keep it from being freed. 3378 */ 3379 static inline void dev_hold(struct net_device *dev) 3380 { 3381 this_cpu_inc(*dev->pcpu_refcnt); 3382 } 3383 3384 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 3385 * and _off may be called from IRQ context, but it is caller 3386 * who is responsible for serialization of these calls. 3387 * 3388 * The name carrier is inappropriate, these functions should really be 3389 * called netif_lowerlayer_*() because they represent the state of any 3390 * kind of lower layer not just hardware media. 3391 */ 3392 3393 void linkwatch_init_dev(struct net_device *dev); 3394 void linkwatch_fire_event(struct net_device *dev); 3395 void linkwatch_forget_dev(struct net_device *dev); 3396 3397 /** 3398 * netif_carrier_ok - test if carrier present 3399 * @dev: network device 3400 * 3401 * Check if carrier is present on device 3402 */ 3403 static inline bool netif_carrier_ok(const struct net_device *dev) 3404 { 3405 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 3406 } 3407 3408 unsigned long dev_trans_start(struct net_device *dev); 3409 3410 void __netdev_watchdog_up(struct net_device *dev); 3411 3412 void netif_carrier_on(struct net_device *dev); 3413 3414 void netif_carrier_off(struct net_device *dev); 3415 3416 /** 3417 * netif_dormant_on - mark device as dormant. 3418 * @dev: network device 3419 * 3420 * Mark device as dormant (as per RFC2863). 3421 * 3422 * The dormant state indicates that the relevant interface is not 3423 * actually in a condition to pass packets (i.e., it is not 'up') but is 3424 * in a "pending" state, waiting for some external event. For "on- 3425 * demand" interfaces, this new state identifies the situation where the 3426 * interface is waiting for events to place it in the up state. 3427 */ 3428 static inline void netif_dormant_on(struct net_device *dev) 3429 { 3430 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 3431 linkwatch_fire_event(dev); 3432 } 3433 3434 /** 3435 * netif_dormant_off - set device as not dormant. 3436 * @dev: network device 3437 * 3438 * Device is not in dormant state. 3439 */ 3440 static inline void netif_dormant_off(struct net_device *dev) 3441 { 3442 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 3443 linkwatch_fire_event(dev); 3444 } 3445 3446 /** 3447 * netif_dormant - test if device is dormant 3448 * @dev: network device 3449 * 3450 * Check if device is dormant. 3451 */ 3452 static inline bool netif_dormant(const struct net_device *dev) 3453 { 3454 return test_bit(__LINK_STATE_DORMANT, &dev->state); 3455 } 3456 3457 3458 /** 3459 * netif_oper_up - test if device is operational 3460 * @dev: network device 3461 * 3462 * Check if carrier is operational 3463 */ 3464 static inline bool netif_oper_up(const struct net_device *dev) 3465 { 3466 return (dev->operstate == IF_OPER_UP || 3467 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 3468 } 3469 3470 /** 3471 * netif_device_present - is device available or removed 3472 * @dev: network device 3473 * 3474 * Check if device has not been removed from system. 3475 */ 3476 static inline bool netif_device_present(struct net_device *dev) 3477 { 3478 return test_bit(__LINK_STATE_PRESENT, &dev->state); 3479 } 3480 3481 void netif_device_detach(struct net_device *dev); 3482 3483 void netif_device_attach(struct net_device *dev); 3484 3485 /* 3486 * Network interface message level settings 3487 */ 3488 3489 enum { 3490 NETIF_MSG_DRV = 0x0001, 3491 NETIF_MSG_PROBE = 0x0002, 3492 NETIF_MSG_LINK = 0x0004, 3493 NETIF_MSG_TIMER = 0x0008, 3494 NETIF_MSG_IFDOWN = 0x0010, 3495 NETIF_MSG_IFUP = 0x0020, 3496 NETIF_MSG_RX_ERR = 0x0040, 3497 NETIF_MSG_TX_ERR = 0x0080, 3498 NETIF_MSG_TX_QUEUED = 0x0100, 3499 NETIF_MSG_INTR = 0x0200, 3500 NETIF_MSG_TX_DONE = 0x0400, 3501 NETIF_MSG_RX_STATUS = 0x0800, 3502 NETIF_MSG_PKTDATA = 0x1000, 3503 NETIF_MSG_HW = 0x2000, 3504 NETIF_MSG_WOL = 0x4000, 3505 }; 3506 3507 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 3508 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 3509 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 3510 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 3511 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 3512 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 3513 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 3514 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 3515 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 3516 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 3517 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 3518 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 3519 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 3520 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 3521 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 3522 3523 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 3524 { 3525 /* use default */ 3526 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 3527 return default_msg_enable_bits; 3528 if (debug_value == 0) /* no output */ 3529 return 0; 3530 /* set low N bits */ 3531 return (1 << debug_value) - 1; 3532 } 3533 3534 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu) 3535 { 3536 spin_lock(&txq->_xmit_lock); 3537 txq->xmit_lock_owner = cpu; 3538 } 3539 3540 static inline bool __netif_tx_acquire(struct netdev_queue *txq) 3541 { 3542 __acquire(&txq->_xmit_lock); 3543 return true; 3544 } 3545 3546 static inline void __netif_tx_release(struct netdev_queue *txq) 3547 { 3548 __release(&txq->_xmit_lock); 3549 } 3550 3551 static inline void __netif_tx_lock_bh(struct netdev_queue *txq) 3552 { 3553 spin_lock_bh(&txq->_xmit_lock); 3554 txq->xmit_lock_owner = smp_processor_id(); 3555 } 3556 3557 static inline bool __netif_tx_trylock(struct netdev_queue *txq) 3558 { 3559 bool ok = spin_trylock(&txq->_xmit_lock); 3560 if (likely(ok)) 3561 txq->xmit_lock_owner = smp_processor_id(); 3562 return ok; 3563 } 3564 3565 static inline void __netif_tx_unlock(struct netdev_queue *txq) 3566 { 3567 txq->xmit_lock_owner = -1; 3568 spin_unlock(&txq->_xmit_lock); 3569 } 3570 3571 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq) 3572 { 3573 txq->xmit_lock_owner = -1; 3574 spin_unlock_bh(&txq->_xmit_lock); 3575 } 3576 3577 static inline void txq_trans_update(struct netdev_queue *txq) 3578 { 3579 if (txq->xmit_lock_owner != -1) 3580 txq->trans_start = jiffies; 3581 } 3582 3583 /* legacy drivers only, netdev_start_xmit() sets txq->trans_start */ 3584 static inline void netif_trans_update(struct net_device *dev) 3585 { 3586 struct netdev_queue *txq = netdev_get_tx_queue(dev, 0); 3587 3588 if (txq->trans_start != jiffies) 3589 txq->trans_start = jiffies; 3590 } 3591 3592 /** 3593 * netif_tx_lock - grab network device transmit lock 3594 * @dev: network device 3595 * 3596 * Get network device transmit lock 3597 */ 3598 static inline void netif_tx_lock(struct net_device *dev) 3599 { 3600 unsigned int i; 3601 int cpu; 3602 3603 spin_lock(&dev->tx_global_lock); 3604 cpu = smp_processor_id(); 3605 for (i = 0; i < dev->num_tx_queues; i++) { 3606 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 3607 3608 /* We are the only thread of execution doing a 3609 * freeze, but we have to grab the _xmit_lock in 3610 * order to synchronize with threads which are in 3611 * the ->hard_start_xmit() handler and already 3612 * checked the frozen bit. 3613 */ 3614 __netif_tx_lock(txq, cpu); 3615 set_bit(__QUEUE_STATE_FROZEN, &txq->state); 3616 __netif_tx_unlock(txq); 3617 } 3618 } 3619 3620 static inline void netif_tx_lock_bh(struct net_device *dev) 3621 { 3622 local_bh_disable(); 3623 netif_tx_lock(dev); 3624 } 3625 3626 static inline void netif_tx_unlock(struct net_device *dev) 3627 { 3628 unsigned int i; 3629 3630 for (i = 0; i < dev->num_tx_queues; i++) { 3631 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 3632 3633 /* No need to grab the _xmit_lock here. If the 3634 * queue is not stopped for another reason, we 3635 * force a schedule. 3636 */ 3637 clear_bit(__QUEUE_STATE_FROZEN, &txq->state); 3638 netif_schedule_queue(txq); 3639 } 3640 spin_unlock(&dev->tx_global_lock); 3641 } 3642 3643 static inline void netif_tx_unlock_bh(struct net_device *dev) 3644 { 3645 netif_tx_unlock(dev); 3646 local_bh_enable(); 3647 } 3648 3649 #define HARD_TX_LOCK(dev, txq, cpu) { \ 3650 if ((dev->features & NETIF_F_LLTX) == 0) { \ 3651 __netif_tx_lock(txq, cpu); \ 3652 } else { \ 3653 __netif_tx_acquire(txq); \ 3654 } \ 3655 } 3656 3657 #define HARD_TX_TRYLOCK(dev, txq) \ 3658 (((dev->features & NETIF_F_LLTX) == 0) ? \ 3659 __netif_tx_trylock(txq) : \ 3660 __netif_tx_acquire(txq)) 3661 3662 #define HARD_TX_UNLOCK(dev, txq) { \ 3663 if ((dev->features & NETIF_F_LLTX) == 0) { \ 3664 __netif_tx_unlock(txq); \ 3665 } else { \ 3666 __netif_tx_release(txq); \ 3667 } \ 3668 } 3669 3670 static inline void netif_tx_disable(struct net_device *dev) 3671 { 3672 unsigned int i; 3673 int cpu; 3674 3675 local_bh_disable(); 3676 cpu = smp_processor_id(); 3677 for (i = 0; i < dev->num_tx_queues; i++) { 3678 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 3679 3680 __netif_tx_lock(txq, cpu); 3681 netif_tx_stop_queue(txq); 3682 __netif_tx_unlock(txq); 3683 } 3684 local_bh_enable(); 3685 } 3686 3687 static inline void netif_addr_lock(struct net_device *dev) 3688 { 3689 spin_lock(&dev->addr_list_lock); 3690 } 3691 3692 static inline void netif_addr_lock_nested(struct net_device *dev) 3693 { 3694 int subclass = SINGLE_DEPTH_NESTING; 3695 3696 if (dev->netdev_ops->ndo_get_lock_subclass) 3697 subclass = dev->netdev_ops->ndo_get_lock_subclass(dev); 3698 3699 spin_lock_nested(&dev->addr_list_lock, subclass); 3700 } 3701 3702 static inline void netif_addr_lock_bh(struct net_device *dev) 3703 { 3704 spin_lock_bh(&dev->addr_list_lock); 3705 } 3706 3707 static inline void netif_addr_unlock(struct net_device *dev) 3708 { 3709 spin_unlock(&dev->addr_list_lock); 3710 } 3711 3712 static inline void netif_addr_unlock_bh(struct net_device *dev) 3713 { 3714 spin_unlock_bh(&dev->addr_list_lock); 3715 } 3716 3717 /* 3718 * dev_addrs walker. Should be used only for read access. Call with 3719 * rcu_read_lock held. 3720 */ 3721 #define for_each_dev_addr(dev, ha) \ 3722 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list) 3723 3724 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 3725 3726 void ether_setup(struct net_device *dev); 3727 3728 /* Support for loadable net-drivers */ 3729 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, 3730 unsigned char name_assign_type, 3731 void (*setup)(struct net_device *), 3732 unsigned int txqs, unsigned int rxqs); 3733 int dev_get_valid_name(struct net *net, struct net_device *dev, 3734 const char *name); 3735 3736 #define alloc_netdev(sizeof_priv, name, name_assign_type, setup) \ 3737 alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, 1, 1) 3738 3739 #define alloc_netdev_mq(sizeof_priv, name, name_assign_type, setup, count) \ 3740 alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, count, \ 3741 count) 3742 3743 int register_netdev(struct net_device *dev); 3744 void unregister_netdev(struct net_device *dev); 3745 3746 /* General hardware address lists handling functions */ 3747 int __hw_addr_sync(struct netdev_hw_addr_list *to_list, 3748 struct netdev_hw_addr_list *from_list, int addr_len); 3749 void __hw_addr_unsync(struct netdev_hw_addr_list *to_list, 3750 struct netdev_hw_addr_list *from_list, int addr_len); 3751 int __hw_addr_sync_dev(struct netdev_hw_addr_list *list, 3752 struct net_device *dev, 3753 int (*sync)(struct net_device *, const unsigned char *), 3754 int (*unsync)(struct net_device *, 3755 const unsigned char *)); 3756 void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list, 3757 struct net_device *dev, 3758 int (*unsync)(struct net_device *, 3759 const unsigned char *)); 3760 void __hw_addr_init(struct netdev_hw_addr_list *list); 3761 3762 /* Functions used for device addresses handling */ 3763 int dev_addr_add(struct net_device *dev, const unsigned char *addr, 3764 unsigned char addr_type); 3765 int dev_addr_del(struct net_device *dev, const unsigned char *addr, 3766 unsigned char addr_type); 3767 void dev_addr_flush(struct net_device *dev); 3768 int dev_addr_init(struct net_device *dev); 3769 3770 /* Functions used for unicast addresses handling */ 3771 int dev_uc_add(struct net_device *dev, const unsigned char *addr); 3772 int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr); 3773 int dev_uc_del(struct net_device *dev, const unsigned char *addr); 3774 int dev_uc_sync(struct net_device *to, struct net_device *from); 3775 int dev_uc_sync_multiple(struct net_device *to, struct net_device *from); 3776 void dev_uc_unsync(struct net_device *to, struct net_device *from); 3777 void dev_uc_flush(struct net_device *dev); 3778 void dev_uc_init(struct net_device *dev); 3779 3780 /** 3781 * __dev_uc_sync - Synchonize device's unicast list 3782 * @dev: device to sync 3783 * @sync: function to call if address should be added 3784 * @unsync: function to call if address should be removed 3785 * 3786 * Add newly added addresses to the interface, and release 3787 * addresses that have been deleted. 3788 */ 3789 static inline int __dev_uc_sync(struct net_device *dev, 3790 int (*sync)(struct net_device *, 3791 const unsigned char *), 3792 int (*unsync)(struct net_device *, 3793 const unsigned char *)) 3794 { 3795 return __hw_addr_sync_dev(&dev->uc, dev, sync, unsync); 3796 } 3797 3798 /** 3799 * __dev_uc_unsync - Remove synchronized addresses from device 3800 * @dev: device to sync 3801 * @unsync: function to call if address should be removed 3802 * 3803 * Remove all addresses that were added to the device by dev_uc_sync(). 3804 */ 3805 static inline void __dev_uc_unsync(struct net_device *dev, 3806 int (*unsync)(struct net_device *, 3807 const unsigned char *)) 3808 { 3809 __hw_addr_unsync_dev(&dev->uc, dev, unsync); 3810 } 3811 3812 /* Functions used for multicast addresses handling */ 3813 int dev_mc_add(struct net_device *dev, const unsigned char *addr); 3814 int dev_mc_add_global(struct net_device *dev, const unsigned char *addr); 3815 int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr); 3816 int dev_mc_del(struct net_device *dev, const unsigned char *addr); 3817 int dev_mc_del_global(struct net_device *dev, const unsigned char *addr); 3818 int dev_mc_sync(struct net_device *to, struct net_device *from); 3819 int dev_mc_sync_multiple(struct net_device *to, struct net_device *from); 3820 void dev_mc_unsync(struct net_device *to, struct net_device *from); 3821 void dev_mc_flush(struct net_device *dev); 3822 void dev_mc_init(struct net_device *dev); 3823 3824 /** 3825 * __dev_mc_sync - Synchonize device's multicast list 3826 * @dev: device to sync 3827 * @sync: function to call if address should be added 3828 * @unsync: function to call if address should be removed 3829 * 3830 * Add newly added addresses to the interface, and release 3831 * addresses that have been deleted. 3832 */ 3833 static inline int __dev_mc_sync(struct net_device *dev, 3834 int (*sync)(struct net_device *, 3835 const unsigned char *), 3836 int (*unsync)(struct net_device *, 3837 const unsigned char *)) 3838 { 3839 return __hw_addr_sync_dev(&dev->mc, dev, sync, unsync); 3840 } 3841 3842 /** 3843 * __dev_mc_unsync - Remove synchronized addresses from device 3844 * @dev: device to sync 3845 * @unsync: function to call if address should be removed 3846 * 3847 * Remove all addresses that were added to the device by dev_mc_sync(). 3848 */ 3849 static inline void __dev_mc_unsync(struct net_device *dev, 3850 int (*unsync)(struct net_device *, 3851 const unsigned char *)) 3852 { 3853 __hw_addr_unsync_dev(&dev->mc, dev, unsync); 3854 } 3855 3856 /* Functions used for secondary unicast and multicast support */ 3857 void dev_set_rx_mode(struct net_device *dev); 3858 void __dev_set_rx_mode(struct net_device *dev); 3859 int dev_set_promiscuity(struct net_device *dev, int inc); 3860 int dev_set_allmulti(struct net_device *dev, int inc); 3861 void netdev_state_change(struct net_device *dev); 3862 void netdev_notify_peers(struct net_device *dev); 3863 void netdev_features_change(struct net_device *dev); 3864 /* Load a device via the kmod */ 3865 void dev_load(struct net *net, const char *name); 3866 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, 3867 struct rtnl_link_stats64 *storage); 3868 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, 3869 const struct net_device_stats *netdev_stats); 3870 3871 extern int netdev_max_backlog; 3872 extern int netdev_tstamp_prequeue; 3873 extern int weight_p; 3874 extern int dev_weight_rx_bias; 3875 extern int dev_weight_tx_bias; 3876 extern int dev_rx_weight; 3877 extern int dev_tx_weight; 3878 3879 bool netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev); 3880 struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, 3881 struct list_head **iter); 3882 struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev, 3883 struct list_head **iter); 3884 3885 /* iterate through upper list, must be called under RCU read lock */ 3886 #define netdev_for_each_upper_dev_rcu(dev, updev, iter) \ 3887 for (iter = &(dev)->adj_list.upper, \ 3888 updev = netdev_upper_get_next_dev_rcu(dev, &(iter)); \ 3889 updev; \ 3890 updev = netdev_upper_get_next_dev_rcu(dev, &(iter))) 3891 3892 int netdev_walk_all_upper_dev_rcu(struct net_device *dev, 3893 int (*fn)(struct net_device *upper_dev, 3894 void *data), 3895 void *data); 3896 3897 bool netdev_has_upper_dev_all_rcu(struct net_device *dev, 3898 struct net_device *upper_dev); 3899 3900 bool netdev_has_any_upper_dev(struct net_device *dev); 3901 3902 void *netdev_lower_get_next_private(struct net_device *dev, 3903 struct list_head **iter); 3904 void *netdev_lower_get_next_private_rcu(struct net_device *dev, 3905 struct list_head **iter); 3906 3907 #define netdev_for_each_lower_private(dev, priv, iter) \ 3908 for (iter = (dev)->adj_list.lower.next, \ 3909 priv = netdev_lower_get_next_private(dev, &(iter)); \ 3910 priv; \ 3911 priv = netdev_lower_get_next_private(dev, &(iter))) 3912 3913 #define netdev_for_each_lower_private_rcu(dev, priv, iter) \ 3914 for (iter = &(dev)->adj_list.lower, \ 3915 priv = netdev_lower_get_next_private_rcu(dev, &(iter)); \ 3916 priv; \ 3917 priv = netdev_lower_get_next_private_rcu(dev, &(iter))) 3918 3919 void *netdev_lower_get_next(struct net_device *dev, 3920 struct list_head **iter); 3921 3922 #define netdev_for_each_lower_dev(dev, ldev, iter) \ 3923 for (iter = (dev)->adj_list.lower.next, \ 3924 ldev = netdev_lower_get_next(dev, &(iter)); \ 3925 ldev; \ 3926 ldev = netdev_lower_get_next(dev, &(iter))) 3927 3928 struct net_device *netdev_all_lower_get_next(struct net_device *dev, 3929 struct list_head **iter); 3930 struct net_device *netdev_all_lower_get_next_rcu(struct net_device *dev, 3931 struct list_head **iter); 3932 3933 int netdev_walk_all_lower_dev(struct net_device *dev, 3934 int (*fn)(struct net_device *lower_dev, 3935 void *data), 3936 void *data); 3937 int netdev_walk_all_lower_dev_rcu(struct net_device *dev, 3938 int (*fn)(struct net_device *lower_dev, 3939 void *data), 3940 void *data); 3941 3942 void *netdev_adjacent_get_private(struct list_head *adj_list); 3943 void *netdev_lower_get_first_private_rcu(struct net_device *dev); 3944 struct net_device *netdev_master_upper_dev_get(struct net_device *dev); 3945 struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev); 3946 int netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev, 3947 struct netlink_ext_ack *extack); 3948 int netdev_master_upper_dev_link(struct net_device *dev, 3949 struct net_device *upper_dev, 3950 void *upper_priv, void *upper_info, 3951 struct netlink_ext_ack *extack); 3952 void netdev_upper_dev_unlink(struct net_device *dev, 3953 struct net_device *upper_dev); 3954 void netdev_adjacent_rename_links(struct net_device *dev, char *oldname); 3955 void *netdev_lower_dev_get_private(struct net_device *dev, 3956 struct net_device *lower_dev); 3957 void netdev_lower_state_changed(struct net_device *lower_dev, 3958 void *lower_state_info); 3959 3960 /* RSS keys are 40 or 52 bytes long */ 3961 #define NETDEV_RSS_KEY_LEN 52 3962 extern u8 netdev_rss_key[NETDEV_RSS_KEY_LEN] __read_mostly; 3963 void netdev_rss_key_fill(void *buffer, size_t len); 3964 3965 int dev_get_nest_level(struct net_device *dev); 3966 int skb_checksum_help(struct sk_buff *skb); 3967 int skb_crc32c_csum_help(struct sk_buff *skb); 3968 int skb_csum_hwoffload_help(struct sk_buff *skb, 3969 const netdev_features_t features); 3970 3971 struct sk_buff *__skb_gso_segment(struct sk_buff *skb, 3972 netdev_features_t features, bool tx_path); 3973 struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb, 3974 netdev_features_t features); 3975 3976 struct netdev_bonding_info { 3977 ifslave slave; 3978 ifbond master; 3979 }; 3980 3981 struct netdev_notifier_bonding_info { 3982 struct netdev_notifier_info info; /* must be first */ 3983 struct netdev_bonding_info bonding_info; 3984 }; 3985 3986 void netdev_bonding_info_change(struct net_device *dev, 3987 struct netdev_bonding_info *bonding_info); 3988 3989 static inline 3990 struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features) 3991 { 3992 return __skb_gso_segment(skb, features, true); 3993 } 3994 __be16 skb_network_protocol(struct sk_buff *skb, int *depth); 3995 3996 static inline bool can_checksum_protocol(netdev_features_t features, 3997 __be16 protocol) 3998 { 3999 if (protocol == htons(ETH_P_FCOE)) 4000 return !!(features & NETIF_F_FCOE_CRC); 4001 4002 /* Assume this is an IP checksum (not SCTP CRC) */ 4003 4004 if (features & NETIF_F_HW_CSUM) { 4005 /* Can checksum everything */ 4006 return true; 4007 } 4008 4009 switch (protocol) { 4010 case htons(ETH_P_IP): 4011 return !!(features & NETIF_F_IP_CSUM); 4012 case htons(ETH_P_IPV6): 4013 return !!(features & NETIF_F_IPV6_CSUM); 4014 default: 4015 return false; 4016 } 4017 } 4018 4019 #ifdef CONFIG_BUG 4020 void netdev_rx_csum_fault(struct net_device *dev); 4021 #else 4022 static inline void netdev_rx_csum_fault(struct net_device *dev) 4023 { 4024 } 4025 #endif 4026 /* rx skb timestamps */ 4027 void net_enable_timestamp(void); 4028 void net_disable_timestamp(void); 4029 4030 #ifdef CONFIG_PROC_FS 4031 int __init dev_proc_init(void); 4032 #else 4033 #define dev_proc_init() 0 4034 #endif 4035 4036 static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops, 4037 struct sk_buff *skb, struct net_device *dev, 4038 bool more) 4039 { 4040 skb->xmit_more = more ? 1 : 0; 4041 return ops->ndo_start_xmit(skb, dev); 4042 } 4043 4044 static inline netdev_tx_t netdev_start_xmit(struct sk_buff *skb, struct net_device *dev, 4045 struct netdev_queue *txq, bool more) 4046 { 4047 const struct net_device_ops *ops = dev->netdev_ops; 4048 int rc; 4049 4050 rc = __netdev_start_xmit(ops, skb, dev, more); 4051 if (rc == NETDEV_TX_OK) 4052 txq_trans_update(txq); 4053 4054 return rc; 4055 } 4056 4057 int netdev_class_create_file_ns(const struct class_attribute *class_attr, 4058 const void *ns); 4059 void netdev_class_remove_file_ns(const struct class_attribute *class_attr, 4060 const void *ns); 4061 4062 static inline int netdev_class_create_file(const struct class_attribute *class_attr) 4063 { 4064 return netdev_class_create_file_ns(class_attr, NULL); 4065 } 4066 4067 static inline void netdev_class_remove_file(const struct class_attribute *class_attr) 4068 { 4069 netdev_class_remove_file_ns(class_attr, NULL); 4070 } 4071 4072 extern const struct kobj_ns_type_operations net_ns_type_operations; 4073 4074 const char *netdev_drivername(const struct net_device *dev); 4075 4076 void linkwatch_run_queue(void); 4077 4078 static inline netdev_features_t netdev_intersect_features(netdev_features_t f1, 4079 netdev_features_t f2) 4080 { 4081 if ((f1 ^ f2) & NETIF_F_HW_CSUM) { 4082 if (f1 & NETIF_F_HW_CSUM) 4083 f1 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); 4084 else 4085 f2 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); 4086 } 4087 4088 return f1 & f2; 4089 } 4090 4091 static inline netdev_features_t netdev_get_wanted_features( 4092 struct net_device *dev) 4093 { 4094 return (dev->features & ~dev->hw_features) | dev->wanted_features; 4095 } 4096 netdev_features_t netdev_increment_features(netdev_features_t all, 4097 netdev_features_t one, netdev_features_t mask); 4098 4099 /* Allow TSO being used on stacked device : 4100 * Performing the GSO segmentation before last device 4101 * is a performance improvement. 4102 */ 4103 static inline netdev_features_t netdev_add_tso_features(netdev_features_t features, 4104 netdev_features_t mask) 4105 { 4106 return netdev_increment_features(features, NETIF_F_ALL_TSO, mask); 4107 } 4108 4109 int __netdev_update_features(struct net_device *dev); 4110 void netdev_update_features(struct net_device *dev); 4111 void netdev_change_features(struct net_device *dev); 4112 4113 void netif_stacked_transfer_operstate(const struct net_device *rootdev, 4114 struct net_device *dev); 4115 4116 netdev_features_t passthru_features_check(struct sk_buff *skb, 4117 struct net_device *dev, 4118 netdev_features_t features); 4119 netdev_features_t netif_skb_features(struct sk_buff *skb); 4120 4121 static inline bool net_gso_ok(netdev_features_t features, int gso_type) 4122 { 4123 netdev_features_t feature = (netdev_features_t)gso_type << NETIF_F_GSO_SHIFT; 4124 4125 /* check flags correspondence */ 4126 BUILD_BUG_ON(SKB_GSO_TCPV4 != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT)); 4127 BUILD_BUG_ON(SKB_GSO_DODGY != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT)); 4128 BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT)); 4129 BUILD_BUG_ON(SKB_GSO_TCP_FIXEDID != (NETIF_F_TSO_MANGLEID >> NETIF_F_GSO_SHIFT)); 4130 BUILD_BUG_ON(SKB_GSO_TCPV6 != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT)); 4131 BUILD_BUG_ON(SKB_GSO_FCOE != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT)); 4132 BUILD_BUG_ON(SKB_GSO_GRE != (NETIF_F_GSO_GRE >> NETIF_F_GSO_SHIFT)); 4133 BUILD_BUG_ON(SKB_GSO_GRE_CSUM != (NETIF_F_GSO_GRE_CSUM >> NETIF_F_GSO_SHIFT)); 4134 BUILD_BUG_ON(SKB_GSO_IPXIP4 != (NETIF_F_GSO_IPXIP4 >> NETIF_F_GSO_SHIFT)); 4135 BUILD_BUG_ON(SKB_GSO_IPXIP6 != (NETIF_F_GSO_IPXIP6 >> NETIF_F_GSO_SHIFT)); 4136 BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL != (NETIF_F_GSO_UDP_TUNNEL >> NETIF_F_GSO_SHIFT)); 4137 BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL_CSUM != (NETIF_F_GSO_UDP_TUNNEL_CSUM >> NETIF_F_GSO_SHIFT)); 4138 BUILD_BUG_ON(SKB_GSO_PARTIAL != (NETIF_F_GSO_PARTIAL >> NETIF_F_GSO_SHIFT)); 4139 BUILD_BUG_ON(SKB_GSO_TUNNEL_REMCSUM != (NETIF_F_GSO_TUNNEL_REMCSUM >> NETIF_F_GSO_SHIFT)); 4140 BUILD_BUG_ON(SKB_GSO_SCTP != (NETIF_F_GSO_SCTP >> NETIF_F_GSO_SHIFT)); 4141 BUILD_BUG_ON(SKB_GSO_ESP != (NETIF_F_GSO_ESP >> NETIF_F_GSO_SHIFT)); 4142 4143 return (features & feature) == feature; 4144 } 4145 4146 static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features) 4147 { 4148 return net_gso_ok(features, skb_shinfo(skb)->gso_type) && 4149 (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST)); 4150 } 4151 4152 static inline bool netif_needs_gso(struct sk_buff *skb, 4153 netdev_features_t features) 4154 { 4155 return skb_is_gso(skb) && (!skb_gso_ok(skb, features) || 4156 unlikely((skb->ip_summed != CHECKSUM_PARTIAL) && 4157 (skb->ip_summed != CHECKSUM_UNNECESSARY))); 4158 } 4159 4160 static inline void netif_set_gso_max_size(struct net_device *dev, 4161 unsigned int size) 4162 { 4163 dev->gso_max_size = size; 4164 } 4165 4166 static inline void skb_gso_error_unwind(struct sk_buff *skb, __be16 protocol, 4167 int pulled_hlen, u16 mac_offset, 4168 int mac_len) 4169 { 4170 skb->protocol = protocol; 4171 skb->encapsulation = 1; 4172 skb_push(skb, pulled_hlen); 4173 skb_reset_transport_header(skb); 4174 skb->mac_header = mac_offset; 4175 skb->network_header = skb->mac_header + mac_len; 4176 skb->mac_len = mac_len; 4177 } 4178 4179 static inline bool netif_is_macsec(const struct net_device *dev) 4180 { 4181 return dev->priv_flags & IFF_MACSEC; 4182 } 4183 4184 static inline bool netif_is_macvlan(const struct net_device *dev) 4185 { 4186 return dev->priv_flags & IFF_MACVLAN; 4187 } 4188 4189 static inline bool netif_is_macvlan_port(const struct net_device *dev) 4190 { 4191 return dev->priv_flags & IFF_MACVLAN_PORT; 4192 } 4193 4194 static inline bool netif_is_ipvlan(const struct net_device *dev) 4195 { 4196 return dev->priv_flags & IFF_IPVLAN_SLAVE; 4197 } 4198 4199 static inline bool netif_is_ipvlan_port(const struct net_device *dev) 4200 { 4201 return dev->priv_flags & IFF_IPVLAN_MASTER; 4202 } 4203 4204 static inline bool netif_is_bond_master(const struct net_device *dev) 4205 { 4206 return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING; 4207 } 4208 4209 static inline bool netif_is_bond_slave(const struct net_device *dev) 4210 { 4211 return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING; 4212 } 4213 4214 static inline bool netif_supports_nofcs(struct net_device *dev) 4215 { 4216 return dev->priv_flags & IFF_SUPP_NOFCS; 4217 } 4218 4219 static inline bool netif_is_l3_master(const struct net_device *dev) 4220 { 4221 return dev->priv_flags & IFF_L3MDEV_MASTER; 4222 } 4223 4224 static inline bool netif_is_l3_slave(const struct net_device *dev) 4225 { 4226 return dev->priv_flags & IFF_L3MDEV_SLAVE; 4227 } 4228 4229 static inline bool netif_is_bridge_master(const struct net_device *dev) 4230 { 4231 return dev->priv_flags & IFF_EBRIDGE; 4232 } 4233 4234 static inline bool netif_is_bridge_port(const struct net_device *dev) 4235 { 4236 return dev->priv_flags & IFF_BRIDGE_PORT; 4237 } 4238 4239 static inline bool netif_is_ovs_master(const struct net_device *dev) 4240 { 4241 return dev->priv_flags & IFF_OPENVSWITCH; 4242 } 4243 4244 static inline bool netif_is_ovs_port(const struct net_device *dev) 4245 { 4246 return dev->priv_flags & IFF_OVS_DATAPATH; 4247 } 4248 4249 static inline bool netif_is_team_master(const struct net_device *dev) 4250 { 4251 return dev->priv_flags & IFF_TEAM; 4252 } 4253 4254 static inline bool netif_is_team_port(const struct net_device *dev) 4255 { 4256 return dev->priv_flags & IFF_TEAM_PORT; 4257 } 4258 4259 static inline bool netif_is_lag_master(const struct net_device *dev) 4260 { 4261 return netif_is_bond_master(dev) || netif_is_team_master(dev); 4262 } 4263 4264 static inline bool netif_is_lag_port(const struct net_device *dev) 4265 { 4266 return netif_is_bond_slave(dev) || netif_is_team_port(dev); 4267 } 4268 4269 static inline bool netif_is_rxfh_configured(const struct net_device *dev) 4270 { 4271 return dev->priv_flags & IFF_RXFH_CONFIGURED; 4272 } 4273 4274 /* This device needs to keep skb dst for qdisc enqueue or ndo_start_xmit() */ 4275 static inline void netif_keep_dst(struct net_device *dev) 4276 { 4277 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM); 4278 } 4279 4280 /* return true if dev can't cope with mtu frames that need vlan tag insertion */ 4281 static inline bool netif_reduces_vlan_mtu(struct net_device *dev) 4282 { 4283 /* TODO: reserve and use an additional IFF bit, if we get more users */ 4284 return dev->priv_flags & IFF_MACSEC; 4285 } 4286 4287 extern struct pernet_operations __net_initdata loopback_net_ops; 4288 4289 /* Logging, debugging and troubleshooting/diagnostic helpers. */ 4290 4291 /* netdev_printk helpers, similar to dev_printk */ 4292 4293 static inline const char *netdev_name(const struct net_device *dev) 4294 { 4295 if (!dev->name[0] || strchr(dev->name, '%')) 4296 return "(unnamed net_device)"; 4297 return dev->name; 4298 } 4299 4300 static inline bool netdev_unregistering(const struct net_device *dev) 4301 { 4302 return dev->reg_state == NETREG_UNREGISTERING; 4303 } 4304 4305 static inline const char *netdev_reg_state(const struct net_device *dev) 4306 { 4307 switch (dev->reg_state) { 4308 case NETREG_UNINITIALIZED: return " (uninitialized)"; 4309 case NETREG_REGISTERED: return ""; 4310 case NETREG_UNREGISTERING: return " (unregistering)"; 4311 case NETREG_UNREGISTERED: return " (unregistered)"; 4312 case NETREG_RELEASED: return " (released)"; 4313 case NETREG_DUMMY: return " (dummy)"; 4314 } 4315 4316 WARN_ONCE(1, "%s: unknown reg_state %d\n", dev->name, dev->reg_state); 4317 return " (unknown)"; 4318 } 4319 4320 __printf(3, 4) 4321 void netdev_printk(const char *level, const struct net_device *dev, 4322 const char *format, ...); 4323 __printf(2, 3) 4324 void netdev_emerg(const struct net_device *dev, const char *format, ...); 4325 __printf(2, 3) 4326 void netdev_alert(const struct net_device *dev, const char *format, ...); 4327 __printf(2, 3) 4328 void netdev_crit(const struct net_device *dev, const char *format, ...); 4329 __printf(2, 3) 4330 void netdev_err(const struct net_device *dev, const char *format, ...); 4331 __printf(2, 3) 4332 void netdev_warn(const struct net_device *dev, const char *format, ...); 4333 __printf(2, 3) 4334 void netdev_notice(const struct net_device *dev, const char *format, ...); 4335 __printf(2, 3) 4336 void netdev_info(const struct net_device *dev, const char *format, ...); 4337 4338 #define MODULE_ALIAS_NETDEV(device) \ 4339 MODULE_ALIAS("netdev-" device) 4340 4341 #if defined(CONFIG_DYNAMIC_DEBUG) 4342 #define netdev_dbg(__dev, format, args...) \ 4343 do { \ 4344 dynamic_netdev_dbg(__dev, format, ##args); \ 4345 } while (0) 4346 #elif defined(DEBUG) 4347 #define netdev_dbg(__dev, format, args...) \ 4348 netdev_printk(KERN_DEBUG, __dev, format, ##args) 4349 #else 4350 #define netdev_dbg(__dev, format, args...) \ 4351 ({ \ 4352 if (0) \ 4353 netdev_printk(KERN_DEBUG, __dev, format, ##args); \ 4354 }) 4355 #endif 4356 4357 #if defined(VERBOSE_DEBUG) 4358 #define netdev_vdbg netdev_dbg 4359 #else 4360 4361 #define netdev_vdbg(dev, format, args...) \ 4362 ({ \ 4363 if (0) \ 4364 netdev_printk(KERN_DEBUG, dev, format, ##args); \ 4365 0; \ 4366 }) 4367 #endif 4368 4369 /* 4370 * netdev_WARN() acts like dev_printk(), but with the key difference 4371 * of using a WARN/WARN_ON to get the message out, including the 4372 * file/line information and a backtrace. 4373 */ 4374 #define netdev_WARN(dev, format, args...) \ 4375 WARN(1, "netdevice: %s%s\n" format, netdev_name(dev), \ 4376 netdev_reg_state(dev), ##args) 4377 4378 /* netif printk helpers, similar to netdev_printk */ 4379 4380 #define netif_printk(priv, type, level, dev, fmt, args...) \ 4381 do { \ 4382 if (netif_msg_##type(priv)) \ 4383 netdev_printk(level, (dev), fmt, ##args); \ 4384 } while (0) 4385 4386 #define netif_level(level, priv, type, dev, fmt, args...) \ 4387 do { \ 4388 if (netif_msg_##type(priv)) \ 4389 netdev_##level(dev, fmt, ##args); \ 4390 } while (0) 4391 4392 #define netif_emerg(priv, type, dev, fmt, args...) \ 4393 netif_level(emerg, priv, type, dev, fmt, ##args) 4394 #define netif_alert(priv, type, dev, fmt, args...) \ 4395 netif_level(alert, priv, type, dev, fmt, ##args) 4396 #define netif_crit(priv, type, dev, fmt, args...) \ 4397 netif_level(crit, priv, type, dev, fmt, ##args) 4398 #define netif_err(priv, type, dev, fmt, args...) \ 4399 netif_level(err, priv, type, dev, fmt, ##args) 4400 #define netif_warn(priv, type, dev, fmt, args...) \ 4401 netif_level(warn, priv, type, dev, fmt, ##args) 4402 #define netif_notice(priv, type, dev, fmt, args...) \ 4403 netif_level(notice, priv, type, dev, fmt, ##args) 4404 #define netif_info(priv, type, dev, fmt, args...) \ 4405 netif_level(info, priv, type, dev, fmt, ##args) 4406 4407 #if defined(CONFIG_DYNAMIC_DEBUG) 4408 #define netif_dbg(priv, type, netdev, format, args...) \ 4409 do { \ 4410 if (netif_msg_##type(priv)) \ 4411 dynamic_netdev_dbg(netdev, format, ##args); \ 4412 } while (0) 4413 #elif defined(DEBUG) 4414 #define netif_dbg(priv, type, dev, format, args...) \ 4415 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args) 4416 #else 4417 #define netif_dbg(priv, type, dev, format, args...) \ 4418 ({ \ 4419 if (0) \ 4420 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \ 4421 0; \ 4422 }) 4423 #endif 4424 4425 /* if @cond then downgrade to debug, else print at @level */ 4426 #define netif_cond_dbg(priv, type, netdev, cond, level, fmt, args...) \ 4427 do { \ 4428 if (cond) \ 4429 netif_dbg(priv, type, netdev, fmt, ##args); \ 4430 else \ 4431 netif_ ## level(priv, type, netdev, fmt, ##args); \ 4432 } while (0) 4433 4434 #if defined(VERBOSE_DEBUG) 4435 #define netif_vdbg netif_dbg 4436 #else 4437 #define netif_vdbg(priv, type, dev, format, args...) \ 4438 ({ \ 4439 if (0) \ 4440 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \ 4441 0; \ 4442 }) 4443 #endif 4444 4445 /* 4446 * The list of packet types we will receive (as opposed to discard) 4447 * and the routines to invoke. 4448 * 4449 * Why 16. Because with 16 the only overlap we get on a hash of the 4450 * low nibble of the protocol value is RARP/SNAP/X.25. 4451 * 4452 * NOTE: That is no longer true with the addition of VLAN tags. Not 4453 * sure which should go first, but I bet it won't make much 4454 * difference if we are running VLANs. The good news is that 4455 * this protocol won't be in the list unless compiled in, so 4456 * the average user (w/out VLANs) will not be adversely affected. 4457 * --BLG 4458 * 4459 * 0800 IP 4460 * 8100 802.1Q VLAN 4461 * 0001 802.3 4462 * 0002 AX.25 4463 * 0004 802.2 4464 * 8035 RARP 4465 * 0005 SNAP 4466 * 0805 X.25 4467 * 0806 ARP 4468 * 8137 IPX 4469 * 0009 Localtalk 4470 * 86DD IPv6 4471 */ 4472 #define PTYPE_HASH_SIZE (16) 4473 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1) 4474 4475 #endif /* _LINUX_NETDEVICE_H */ 4476