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 #include <net/xdp.h> 48 49 #include <linux/netdev_features.h> 50 #include <linux/neighbour.h> 51 #include <uapi/linux/netdevice.h> 52 #include <uapi/linux/if_bonding.h> 53 #include <uapi/linux/pkt_cls.h> 54 #include <linux/hashtable.h> 55 56 struct netpoll_info; 57 struct device; 58 struct phy_device; 59 struct dsa_port; 60 61 /* 802.11 specific */ 62 struct wireless_dev; 63 /* 802.15.4 specific */ 64 struct wpan_dev; 65 struct mpls_dev; 66 /* UDP Tunnel offloads */ 67 struct udp_tunnel_info; 68 struct bpf_prog; 69 struct xdp_buff; 70 71 void netdev_set_default_ethtool_ops(struct net_device *dev, 72 const struct ethtool_ops *ops); 73 74 /* Backlog congestion levels */ 75 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */ 76 #define NET_RX_DROP 1 /* packet dropped */ 77 78 /* 79 * Transmit return codes: transmit return codes originate from three different 80 * namespaces: 81 * 82 * - qdisc return codes 83 * - driver transmit return codes 84 * - errno values 85 * 86 * Drivers are allowed to return any one of those in their hard_start_xmit() 87 * function. Real network devices commonly used with qdiscs should only return 88 * the driver transmit return codes though - when qdiscs are used, the actual 89 * transmission happens asynchronously, so the value is not propagated to 90 * higher layers. Virtual network devices transmit synchronously; in this case 91 * the driver transmit return codes are consumed by dev_queue_xmit(), and all 92 * others are propagated to higher layers. 93 */ 94 95 /* qdisc ->enqueue() return codes. */ 96 #define NET_XMIT_SUCCESS 0x00 97 #define NET_XMIT_DROP 0x01 /* skb dropped */ 98 #define NET_XMIT_CN 0x02 /* congestion notification */ 99 #define NET_XMIT_MASK 0x0f /* qdisc flags in net/sch_generic.h */ 100 101 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It 102 * indicates that the device will soon be dropping packets, or already drops 103 * some packets of the same priority; prompting us to send less aggressively. */ 104 #define net_xmit_eval(e) ((e) == NET_XMIT_CN ? 0 : (e)) 105 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0) 106 107 /* Driver transmit return codes */ 108 #define NETDEV_TX_MASK 0xf0 109 110 enum netdev_tx { 111 __NETDEV_TX_MIN = INT_MIN, /* make sure enum is signed */ 112 NETDEV_TX_OK = 0x00, /* driver took care of packet */ 113 NETDEV_TX_BUSY = 0x10, /* driver tx path was busy*/ 114 }; 115 typedef enum netdev_tx netdev_tx_t; 116 117 /* 118 * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant; 119 * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed. 120 */ 121 static inline bool dev_xmit_complete(int rc) 122 { 123 /* 124 * Positive cases with an skb consumed by a driver: 125 * - successful transmission (rc == NETDEV_TX_OK) 126 * - error while transmitting (rc < 0) 127 * - error while queueing to a different device (rc & NET_XMIT_MASK) 128 */ 129 if (likely(rc < NET_XMIT_MASK)) 130 return true; 131 132 return false; 133 } 134 135 /* 136 * Compute the worst-case header length according to the protocols 137 * used. 138 */ 139 140 #if defined(CONFIG_HYPERV_NET) 141 # define LL_MAX_HEADER 128 142 #elif defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25) 143 # if defined(CONFIG_MAC80211_MESH) 144 # define LL_MAX_HEADER 128 145 # else 146 # define LL_MAX_HEADER 96 147 # endif 148 #else 149 # define LL_MAX_HEADER 32 150 #endif 151 152 #if !IS_ENABLED(CONFIG_NET_IPIP) && !IS_ENABLED(CONFIG_NET_IPGRE) && \ 153 !IS_ENABLED(CONFIG_IPV6_SIT) && !IS_ENABLED(CONFIG_IPV6_TUNNEL) 154 #define MAX_HEADER LL_MAX_HEADER 155 #else 156 #define MAX_HEADER (LL_MAX_HEADER + 48) 157 #endif 158 159 /* 160 * Old network device statistics. Fields are native words 161 * (unsigned long) so they can be read and written atomically. 162 */ 163 164 struct net_device_stats { 165 unsigned long rx_packets; 166 unsigned long tx_packets; 167 unsigned long rx_bytes; 168 unsigned long tx_bytes; 169 unsigned long rx_errors; 170 unsigned long tx_errors; 171 unsigned long rx_dropped; 172 unsigned long tx_dropped; 173 unsigned long multicast; 174 unsigned long collisions; 175 unsigned long rx_length_errors; 176 unsigned long rx_over_errors; 177 unsigned long rx_crc_errors; 178 unsigned long rx_frame_errors; 179 unsigned long rx_fifo_errors; 180 unsigned long rx_missed_errors; 181 unsigned long tx_aborted_errors; 182 unsigned long tx_carrier_errors; 183 unsigned long tx_fifo_errors; 184 unsigned long tx_heartbeat_errors; 185 unsigned long tx_window_errors; 186 unsigned long rx_compressed; 187 unsigned long tx_compressed; 188 }; 189 190 191 #include <linux/cache.h> 192 #include <linux/skbuff.h> 193 194 #ifdef CONFIG_RPS 195 #include <linux/static_key.h> 196 extern struct static_key rps_needed; 197 extern struct static_key rfs_needed; 198 #endif 199 200 struct neighbour; 201 struct neigh_parms; 202 struct sk_buff; 203 204 struct netdev_hw_addr { 205 struct list_head list; 206 unsigned char addr[MAX_ADDR_LEN]; 207 unsigned char type; 208 #define NETDEV_HW_ADDR_T_LAN 1 209 #define NETDEV_HW_ADDR_T_SAN 2 210 #define NETDEV_HW_ADDR_T_SLAVE 3 211 #define NETDEV_HW_ADDR_T_UNICAST 4 212 #define NETDEV_HW_ADDR_T_MULTICAST 5 213 bool global_use; 214 int sync_cnt; 215 int refcount; 216 int synced; 217 struct rcu_head rcu_head; 218 }; 219 220 struct netdev_hw_addr_list { 221 struct list_head list; 222 int count; 223 }; 224 225 #define netdev_hw_addr_list_count(l) ((l)->count) 226 #define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0) 227 #define netdev_hw_addr_list_for_each(ha, l) \ 228 list_for_each_entry(ha, &(l)->list, list) 229 230 #define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc) 231 #define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc) 232 #define netdev_for_each_uc_addr(ha, dev) \ 233 netdev_hw_addr_list_for_each(ha, &(dev)->uc) 234 235 #define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc) 236 #define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc) 237 #define netdev_for_each_mc_addr(ha, dev) \ 238 netdev_hw_addr_list_for_each(ha, &(dev)->mc) 239 240 struct hh_cache { 241 unsigned int hh_len; 242 seqlock_t hh_lock; 243 244 /* cached hardware header; allow for machine alignment needs. */ 245 #define HH_DATA_MOD 16 246 #define HH_DATA_OFF(__len) \ 247 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) 248 #define HH_DATA_ALIGN(__len) \ 249 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) 250 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; 251 }; 252 253 /* Reserve HH_DATA_MOD byte-aligned hard_header_len, but at least that much. 254 * Alternative is: 255 * dev->hard_header_len ? (dev->hard_header_len + 256 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 257 * 258 * We could use other alignment values, but we must maintain the 259 * relationship HH alignment <= LL alignment. 260 */ 261 #define LL_RESERVED_SPACE(dev) \ 262 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 263 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 264 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 265 266 struct header_ops { 267 int (*create) (struct sk_buff *skb, struct net_device *dev, 268 unsigned short type, const void *daddr, 269 const void *saddr, unsigned int len); 270 int (*parse)(const struct sk_buff *skb, unsigned char *haddr); 271 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh, __be16 type); 272 void (*cache_update)(struct hh_cache *hh, 273 const struct net_device *dev, 274 const unsigned char *haddr); 275 bool (*validate)(const char *ll_header, unsigned int len); 276 }; 277 278 /* These flag bits are private to the generic network queueing 279 * layer; they may not be explicitly referenced by any other 280 * code. 281 */ 282 283 enum netdev_state_t { 284 __LINK_STATE_START, 285 __LINK_STATE_PRESENT, 286 __LINK_STATE_NOCARRIER, 287 __LINK_STATE_LINKWATCH_PENDING, 288 __LINK_STATE_DORMANT, 289 }; 290 291 292 /* 293 * This structure holds boot-time configured netdevice settings. They 294 * are then used in the device probing. 295 */ 296 struct netdev_boot_setup { 297 char name[IFNAMSIZ]; 298 struct ifmap map; 299 }; 300 #define NETDEV_BOOT_SETUP_MAX 8 301 302 int __init netdev_boot_setup(char *str); 303 304 /* 305 * Structure for NAPI scheduling similar to tasklet but with weighting 306 */ 307 struct napi_struct { 308 /* The poll_list must only be managed by the entity which 309 * changes the state of the NAPI_STATE_SCHED bit. This means 310 * whoever atomically sets that bit can add this napi_struct 311 * to the per-CPU poll_list, and whoever clears that bit 312 * can remove from the list right before clearing the bit. 313 */ 314 struct list_head poll_list; 315 316 unsigned long state; 317 int weight; 318 unsigned int gro_count; 319 int (*poll)(struct napi_struct *, int); 320 #ifdef CONFIG_NETPOLL 321 int poll_owner; 322 #endif 323 struct net_device *dev; 324 struct sk_buff *gro_list; 325 struct sk_buff *skb; 326 struct hrtimer timer; 327 struct list_head dev_list; 328 struct hlist_node napi_hash_node; 329 unsigned int napi_id; 330 }; 331 332 enum { 333 NAPI_STATE_SCHED, /* Poll is scheduled */ 334 NAPI_STATE_MISSED, /* reschedule a napi */ 335 NAPI_STATE_DISABLE, /* Disable pending */ 336 NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */ 337 NAPI_STATE_HASHED, /* In NAPI hash (busy polling possible) */ 338 NAPI_STATE_NO_BUSY_POLL,/* Do not add in napi_hash, no busy polling */ 339 NAPI_STATE_IN_BUSY_POLL,/* sk_busy_loop() owns this NAPI */ 340 }; 341 342 enum { 343 NAPIF_STATE_SCHED = BIT(NAPI_STATE_SCHED), 344 NAPIF_STATE_MISSED = BIT(NAPI_STATE_MISSED), 345 NAPIF_STATE_DISABLE = BIT(NAPI_STATE_DISABLE), 346 NAPIF_STATE_NPSVC = BIT(NAPI_STATE_NPSVC), 347 NAPIF_STATE_HASHED = BIT(NAPI_STATE_HASHED), 348 NAPIF_STATE_NO_BUSY_POLL = BIT(NAPI_STATE_NO_BUSY_POLL), 349 NAPIF_STATE_IN_BUSY_POLL = BIT(NAPI_STATE_IN_BUSY_POLL), 350 }; 351 352 enum gro_result { 353 GRO_MERGED, 354 GRO_MERGED_FREE, 355 GRO_HELD, 356 GRO_NORMAL, 357 GRO_DROP, 358 GRO_CONSUMED, 359 }; 360 typedef enum gro_result gro_result_t; 361 362 /* 363 * enum rx_handler_result - Possible return values for rx_handlers. 364 * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it 365 * further. 366 * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in 367 * case skb->dev was changed by rx_handler. 368 * @RX_HANDLER_EXACT: Force exact delivery, no wildcard. 369 * @RX_HANDLER_PASS: Do nothing, pass the skb as if no rx_handler was called. 370 * 371 * rx_handlers are functions called from inside __netif_receive_skb(), to do 372 * special processing of the skb, prior to delivery to protocol handlers. 373 * 374 * Currently, a net_device can only have a single rx_handler registered. Trying 375 * to register a second rx_handler will return -EBUSY. 376 * 377 * To register a rx_handler on a net_device, use netdev_rx_handler_register(). 378 * To unregister a rx_handler on a net_device, use 379 * netdev_rx_handler_unregister(). 380 * 381 * Upon return, rx_handler is expected to tell __netif_receive_skb() what to 382 * do with the skb. 383 * 384 * If the rx_handler consumed the skb in some way, it should return 385 * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for 386 * the skb to be delivered in some other way. 387 * 388 * If the rx_handler changed skb->dev, to divert the skb to another 389 * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the 390 * new device will be called if it exists. 391 * 392 * If the rx_handler decides the skb should be ignored, it should return 393 * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that 394 * are registered on exact device (ptype->dev == skb->dev). 395 * 396 * If the rx_handler didn't change skb->dev, but wants the skb to be normally 397 * delivered, it should return RX_HANDLER_PASS. 398 * 399 * A device without a registered rx_handler will behave as if rx_handler 400 * returned RX_HANDLER_PASS. 401 */ 402 403 enum rx_handler_result { 404 RX_HANDLER_CONSUMED, 405 RX_HANDLER_ANOTHER, 406 RX_HANDLER_EXACT, 407 RX_HANDLER_PASS, 408 }; 409 typedef enum rx_handler_result rx_handler_result_t; 410 typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb); 411 412 void __napi_schedule(struct napi_struct *n); 413 void __napi_schedule_irqoff(struct napi_struct *n); 414 415 static inline bool napi_disable_pending(struct napi_struct *n) 416 { 417 return test_bit(NAPI_STATE_DISABLE, &n->state); 418 } 419 420 bool napi_schedule_prep(struct napi_struct *n); 421 422 /** 423 * napi_schedule - schedule NAPI poll 424 * @n: NAPI context 425 * 426 * Schedule NAPI poll routine to be called if it is not already 427 * running. 428 */ 429 static inline void napi_schedule(struct napi_struct *n) 430 { 431 if (napi_schedule_prep(n)) 432 __napi_schedule(n); 433 } 434 435 /** 436 * napi_schedule_irqoff - schedule NAPI poll 437 * @n: NAPI context 438 * 439 * Variant of napi_schedule(), assuming hard irqs are masked. 440 */ 441 static inline void napi_schedule_irqoff(struct napi_struct *n) 442 { 443 if (napi_schedule_prep(n)) 444 __napi_schedule_irqoff(n); 445 } 446 447 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */ 448 static inline bool napi_reschedule(struct napi_struct *napi) 449 { 450 if (napi_schedule_prep(napi)) { 451 __napi_schedule(napi); 452 return true; 453 } 454 return false; 455 } 456 457 bool napi_complete_done(struct napi_struct *n, int work_done); 458 /** 459 * napi_complete - NAPI processing complete 460 * @n: NAPI context 461 * 462 * Mark NAPI processing as complete. 463 * Consider using napi_complete_done() instead. 464 * Return false if device should avoid rearming interrupts. 465 */ 466 static inline bool napi_complete(struct napi_struct *n) 467 { 468 return napi_complete_done(n, 0); 469 } 470 471 /** 472 * napi_hash_del - remove a NAPI from global table 473 * @napi: NAPI context 474 * 475 * Warning: caller must observe RCU grace period 476 * before freeing memory containing @napi, if 477 * this function returns true. 478 * Note: core networking stack automatically calls it 479 * from netif_napi_del(). 480 * Drivers might want to call this helper to combine all 481 * the needed RCU grace periods into a single one. 482 */ 483 bool napi_hash_del(struct napi_struct *napi); 484 485 /** 486 * napi_disable - prevent NAPI from scheduling 487 * @n: NAPI context 488 * 489 * Stop NAPI from being scheduled on this context. 490 * Waits till any outstanding processing completes. 491 */ 492 void napi_disable(struct napi_struct *n); 493 494 /** 495 * napi_enable - enable NAPI scheduling 496 * @n: NAPI context 497 * 498 * Resume NAPI from being scheduled on this context. 499 * Must be paired with napi_disable. 500 */ 501 static inline void napi_enable(struct napi_struct *n) 502 { 503 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); 504 smp_mb__before_atomic(); 505 clear_bit(NAPI_STATE_SCHED, &n->state); 506 clear_bit(NAPI_STATE_NPSVC, &n->state); 507 } 508 509 /** 510 * napi_synchronize - wait until NAPI is not running 511 * @n: NAPI context 512 * 513 * Wait until NAPI is done being scheduled on this context. 514 * Waits till any outstanding processing completes but 515 * does not disable future activations. 516 */ 517 static inline void napi_synchronize(const struct napi_struct *n) 518 { 519 if (IS_ENABLED(CONFIG_SMP)) 520 while (test_bit(NAPI_STATE_SCHED, &n->state)) 521 msleep(1); 522 else 523 barrier(); 524 } 525 526 enum netdev_queue_state_t { 527 __QUEUE_STATE_DRV_XOFF, 528 __QUEUE_STATE_STACK_XOFF, 529 __QUEUE_STATE_FROZEN, 530 }; 531 532 #define QUEUE_STATE_DRV_XOFF (1 << __QUEUE_STATE_DRV_XOFF) 533 #define QUEUE_STATE_STACK_XOFF (1 << __QUEUE_STATE_STACK_XOFF) 534 #define QUEUE_STATE_FROZEN (1 << __QUEUE_STATE_FROZEN) 535 536 #define QUEUE_STATE_ANY_XOFF (QUEUE_STATE_DRV_XOFF | QUEUE_STATE_STACK_XOFF) 537 #define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF | \ 538 QUEUE_STATE_FROZEN) 539 #define QUEUE_STATE_DRV_XOFF_OR_FROZEN (QUEUE_STATE_DRV_XOFF | \ 540 QUEUE_STATE_FROZEN) 541 542 /* 543 * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue. The 544 * netif_tx_* functions below are used to manipulate this flag. The 545 * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit 546 * queue independently. The netif_xmit_*stopped functions below are called 547 * to check if the queue has been stopped by the driver or stack (either 548 * of the XOFF bits are set in the state). Drivers should not need to call 549 * netif_xmit*stopped functions, they should only be using netif_tx_*. 550 */ 551 552 struct netdev_queue { 553 /* 554 * read-mostly part 555 */ 556 struct net_device *dev; 557 struct Qdisc __rcu *qdisc; 558 struct Qdisc *qdisc_sleeping; 559 #ifdef CONFIG_SYSFS 560 struct kobject kobj; 561 #endif 562 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA) 563 int numa_node; 564 #endif 565 unsigned long tx_maxrate; 566 /* 567 * Number of TX timeouts for this queue 568 * (/sys/class/net/DEV/Q/trans_timeout) 569 */ 570 unsigned long trans_timeout; 571 /* 572 * write-mostly part 573 */ 574 spinlock_t _xmit_lock ____cacheline_aligned_in_smp; 575 int xmit_lock_owner; 576 /* 577 * Time (in jiffies) of last Tx 578 */ 579 unsigned long trans_start; 580 581 unsigned long state; 582 583 #ifdef CONFIG_BQL 584 struct dql dql; 585 #endif 586 } ____cacheline_aligned_in_smp; 587 588 static inline int netdev_queue_numa_node_read(const struct netdev_queue *q) 589 { 590 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA) 591 return q->numa_node; 592 #else 593 return NUMA_NO_NODE; 594 #endif 595 } 596 597 static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node) 598 { 599 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA) 600 q->numa_node = node; 601 #endif 602 } 603 604 #ifdef CONFIG_RPS 605 /* 606 * This structure holds an RPS map which can be of variable length. The 607 * map is an array of CPUs. 608 */ 609 struct rps_map { 610 unsigned int len; 611 struct rcu_head rcu; 612 u16 cpus[0]; 613 }; 614 #define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16))) 615 616 /* 617 * The rps_dev_flow structure contains the mapping of a flow to a CPU, the 618 * tail pointer for that CPU's input queue at the time of last enqueue, and 619 * a hardware filter index. 620 */ 621 struct rps_dev_flow { 622 u16 cpu; 623 u16 filter; 624 unsigned int last_qtail; 625 }; 626 #define RPS_NO_FILTER 0xffff 627 628 /* 629 * The rps_dev_flow_table structure contains a table of flow mappings. 630 */ 631 struct rps_dev_flow_table { 632 unsigned int mask; 633 struct rcu_head rcu; 634 struct rps_dev_flow flows[0]; 635 }; 636 #define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \ 637 ((_num) * sizeof(struct rps_dev_flow))) 638 639 /* 640 * The rps_sock_flow_table contains mappings of flows to the last CPU 641 * on which they were processed by the application (set in recvmsg). 642 * Each entry is a 32bit value. Upper part is the high-order bits 643 * of flow hash, lower part is CPU number. 644 * rps_cpu_mask is used to partition the space, depending on number of 645 * possible CPUs : rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1 646 * For example, if 64 CPUs are possible, rps_cpu_mask = 0x3f, 647 * meaning we use 32-6=26 bits for the hash. 648 */ 649 struct rps_sock_flow_table { 650 u32 mask; 651 652 u32 ents[0] ____cacheline_aligned_in_smp; 653 }; 654 #define RPS_SOCK_FLOW_TABLE_SIZE(_num) (offsetof(struct rps_sock_flow_table, ents[_num])) 655 656 #define RPS_NO_CPU 0xffff 657 658 extern u32 rps_cpu_mask; 659 extern struct rps_sock_flow_table __rcu *rps_sock_flow_table; 660 661 static inline void rps_record_sock_flow(struct rps_sock_flow_table *table, 662 u32 hash) 663 { 664 if (table && hash) { 665 unsigned int index = hash & table->mask; 666 u32 val = hash & ~rps_cpu_mask; 667 668 /* We only give a hint, preemption can change CPU under us */ 669 val |= raw_smp_processor_id(); 670 671 if (table->ents[index] != val) 672 table->ents[index] = val; 673 } 674 } 675 676 #ifdef CONFIG_RFS_ACCEL 677 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id, 678 u16 filter_id); 679 #endif 680 #endif /* CONFIG_RPS */ 681 682 /* This structure contains an instance of an RX queue. */ 683 struct netdev_rx_queue { 684 #ifdef CONFIG_RPS 685 struct rps_map __rcu *rps_map; 686 struct rps_dev_flow_table __rcu *rps_flow_table; 687 #endif 688 struct kobject kobj; 689 struct net_device *dev; 690 struct xdp_rxq_info xdp_rxq; 691 } ____cacheline_aligned_in_smp; 692 693 /* 694 * RX queue sysfs structures and functions. 695 */ 696 struct rx_queue_attribute { 697 struct attribute attr; 698 ssize_t (*show)(struct netdev_rx_queue *queue, char *buf); 699 ssize_t (*store)(struct netdev_rx_queue *queue, 700 const char *buf, size_t len); 701 }; 702 703 #ifdef CONFIG_XPS 704 /* 705 * This structure holds an XPS map which can be of variable length. The 706 * map is an array of queues. 707 */ 708 struct xps_map { 709 unsigned int len; 710 unsigned int alloc_len; 711 struct rcu_head rcu; 712 u16 queues[0]; 713 }; 714 #define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16))) 715 #define XPS_MIN_MAP_ALLOC ((L1_CACHE_ALIGN(offsetof(struct xps_map, queues[1])) \ 716 - sizeof(struct xps_map)) / sizeof(u16)) 717 718 /* 719 * This structure holds all XPS maps for device. Maps are indexed by CPU. 720 */ 721 struct xps_dev_maps { 722 struct rcu_head rcu; 723 struct xps_map __rcu *cpu_map[0]; 724 }; 725 #define XPS_DEV_MAPS_SIZE(_tcs) (sizeof(struct xps_dev_maps) + \ 726 (nr_cpu_ids * (_tcs) * sizeof(struct xps_map *))) 727 #endif /* CONFIG_XPS */ 728 729 #define TC_MAX_QUEUE 16 730 #define TC_BITMASK 15 731 /* HW offloaded queuing disciplines txq count and offset maps */ 732 struct netdev_tc_txq { 733 u16 count; 734 u16 offset; 735 }; 736 737 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 738 /* 739 * This structure is to hold information about the device 740 * configured to run FCoE protocol stack. 741 */ 742 struct netdev_fcoe_hbainfo { 743 char manufacturer[64]; 744 char serial_number[64]; 745 char hardware_version[64]; 746 char driver_version[64]; 747 char optionrom_version[64]; 748 char firmware_version[64]; 749 char model[256]; 750 char model_description[256]; 751 }; 752 #endif 753 754 #define MAX_PHYS_ITEM_ID_LEN 32 755 756 /* This structure holds a unique identifier to identify some 757 * physical item (port for example) used by a netdevice. 758 */ 759 struct netdev_phys_item_id { 760 unsigned char id[MAX_PHYS_ITEM_ID_LEN]; 761 unsigned char id_len; 762 }; 763 764 static inline bool netdev_phys_item_id_same(struct netdev_phys_item_id *a, 765 struct netdev_phys_item_id *b) 766 { 767 return a->id_len == b->id_len && 768 memcmp(a->id, b->id, a->id_len) == 0; 769 } 770 771 typedef u16 (*select_queue_fallback_t)(struct net_device *dev, 772 struct sk_buff *skb); 773 774 enum tc_setup_type { 775 TC_SETUP_QDISC_MQPRIO, 776 TC_SETUP_CLSU32, 777 TC_SETUP_CLSFLOWER, 778 TC_SETUP_CLSMATCHALL, 779 TC_SETUP_CLSBPF, 780 TC_SETUP_BLOCK, 781 TC_SETUP_QDISC_CBS, 782 TC_SETUP_QDISC_RED, 783 TC_SETUP_QDISC_PRIO, 784 }; 785 786 /* These structures hold the attributes of bpf state that are being passed 787 * to the netdevice through the bpf op. 788 */ 789 enum bpf_netdev_command { 790 /* Set or clear a bpf program used in the earliest stages of packet 791 * rx. The prog will have been loaded as BPF_PROG_TYPE_XDP. The callee 792 * is responsible for calling bpf_prog_put on any old progs that are 793 * stored. In case of error, the callee need not release the new prog 794 * reference, but on success it takes ownership and must bpf_prog_put 795 * when it is no longer used. 796 */ 797 XDP_SETUP_PROG, 798 XDP_SETUP_PROG_HW, 799 /* Check if a bpf program is set on the device. The callee should 800 * set @prog_attached to one of XDP_ATTACHED_* values, note that "true" 801 * is equivalent to XDP_ATTACHED_DRV. 802 */ 803 XDP_QUERY_PROG, 804 /* BPF program for offload callbacks, invoked at program load time. */ 805 BPF_OFFLOAD_VERIFIER_PREP, 806 BPF_OFFLOAD_TRANSLATE, 807 BPF_OFFLOAD_DESTROY, 808 BPF_OFFLOAD_MAP_ALLOC, 809 BPF_OFFLOAD_MAP_FREE, 810 }; 811 812 struct bpf_prog_offload_ops; 813 struct netlink_ext_ack; 814 815 struct netdev_bpf { 816 enum bpf_netdev_command command; 817 union { 818 /* XDP_SETUP_PROG */ 819 struct { 820 u32 flags; 821 struct bpf_prog *prog; 822 struct netlink_ext_ack *extack; 823 }; 824 /* XDP_QUERY_PROG */ 825 struct { 826 u8 prog_attached; 827 u32 prog_id; 828 /* flags with which program was installed */ 829 u32 prog_flags; 830 }; 831 /* BPF_OFFLOAD_VERIFIER_PREP */ 832 struct { 833 struct bpf_prog *prog; 834 const struct bpf_prog_offload_ops *ops; /* callee set */ 835 } verifier; 836 /* BPF_OFFLOAD_TRANSLATE, BPF_OFFLOAD_DESTROY */ 837 struct { 838 struct bpf_prog *prog; 839 } offload; 840 /* BPF_OFFLOAD_MAP_ALLOC, BPF_OFFLOAD_MAP_FREE */ 841 struct { 842 struct bpf_offloaded_map *offmap; 843 }; 844 }; 845 }; 846 847 #ifdef CONFIG_XFRM_OFFLOAD 848 struct xfrmdev_ops { 849 int (*xdo_dev_state_add) (struct xfrm_state *x); 850 void (*xdo_dev_state_delete) (struct xfrm_state *x); 851 void (*xdo_dev_state_free) (struct xfrm_state *x); 852 bool (*xdo_dev_offload_ok) (struct sk_buff *skb, 853 struct xfrm_state *x); 854 }; 855 #endif 856 857 struct dev_ifalias { 858 struct rcu_head rcuhead; 859 char ifalias[]; 860 }; 861 862 /* 863 * This structure defines the management hooks for network devices. 864 * The following hooks can be defined; unless noted otherwise, they are 865 * optional and can be filled with a null pointer. 866 * 867 * int (*ndo_init)(struct net_device *dev); 868 * This function is called once when a network device is registered. 869 * The network device can use this for any late stage initialization 870 * or semantic validation. It can fail with an error code which will 871 * be propagated back to register_netdev. 872 * 873 * void (*ndo_uninit)(struct net_device *dev); 874 * This function is called when device is unregistered or when registration 875 * fails. It is not called if init fails. 876 * 877 * int (*ndo_open)(struct net_device *dev); 878 * This function is called when a network device transitions to the up 879 * state. 880 * 881 * int (*ndo_stop)(struct net_device *dev); 882 * This function is called when a network device transitions to the down 883 * state. 884 * 885 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb, 886 * struct net_device *dev); 887 * Called when a packet needs to be transmitted. 888 * Returns NETDEV_TX_OK. Can return NETDEV_TX_BUSY, but you should stop 889 * the queue before that can happen; it's for obsolete devices and weird 890 * corner cases, but the stack really does a non-trivial amount 891 * of useless work if you return NETDEV_TX_BUSY. 892 * Required; cannot be NULL. 893 * 894 * netdev_features_t (*ndo_features_check)(struct sk_buff *skb, 895 * struct net_device *dev 896 * netdev_features_t features); 897 * Called by core transmit path to determine if device is capable of 898 * performing offload operations on a given packet. This is to give 899 * the device an opportunity to implement any restrictions that cannot 900 * be otherwise expressed by feature flags. The check is called with 901 * the set of features that the stack has calculated and it returns 902 * those the driver believes to be appropriate. 903 * 904 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb, 905 * void *accel_priv, select_queue_fallback_t fallback); 906 * Called to decide which queue to use when device supports multiple 907 * transmit queues. 908 * 909 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags); 910 * This function is called to allow device receiver to make 911 * changes to configuration when multicast or promiscuous is enabled. 912 * 913 * void (*ndo_set_rx_mode)(struct net_device *dev); 914 * This function is called device changes address list filtering. 915 * If driver handles unicast address filtering, it should set 916 * IFF_UNICAST_FLT in its priv_flags. 917 * 918 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr); 919 * This function is called when the Media Access Control address 920 * needs to be changed. If this interface is not defined, the 921 * MAC address can not be changed. 922 * 923 * int (*ndo_validate_addr)(struct net_device *dev); 924 * Test if Media Access Control address is valid for the device. 925 * 926 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd); 927 * Called when a user requests an ioctl which can't be handled by 928 * the generic interface code. If not defined ioctls return 929 * not supported error code. 930 * 931 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map); 932 * Used to set network devices bus interface parameters. This interface 933 * is retained for legacy reasons; new devices should use the bus 934 * interface (PCI) for low level management. 935 * 936 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu); 937 * Called when a user wants to change the Maximum Transfer Unit 938 * of a device. 939 * 940 * void (*ndo_tx_timeout)(struct net_device *dev); 941 * Callback used when the transmitter has not made any progress 942 * for dev->watchdog ticks. 943 * 944 * void (*ndo_get_stats64)(struct net_device *dev, 945 * struct rtnl_link_stats64 *storage); 946 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev); 947 * Called when a user wants to get the network device usage 948 * statistics. Drivers must do one of the following: 949 * 1. Define @ndo_get_stats64 to fill in a zero-initialised 950 * rtnl_link_stats64 structure passed by the caller. 951 * 2. Define @ndo_get_stats to update a net_device_stats structure 952 * (which should normally be dev->stats) and return a pointer to 953 * it. The structure may be changed asynchronously only if each 954 * field is written atomically. 955 * 3. Update dev->stats asynchronously and atomically, and define 956 * neither operation. 957 * 958 * bool (*ndo_has_offload_stats)(const struct net_device *dev, int attr_id) 959 * Return true if this device supports offload stats of this attr_id. 960 * 961 * int (*ndo_get_offload_stats)(int attr_id, const struct net_device *dev, 962 * void *attr_data) 963 * Get statistics for offload operations by attr_id. Write it into the 964 * attr_data pointer. 965 * 966 * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, __be16 proto, u16 vid); 967 * If device supports VLAN filtering this function is called when a 968 * VLAN id is registered. 969 * 970 * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, __be16 proto, u16 vid); 971 * If device supports VLAN filtering this function is called when a 972 * VLAN id is unregistered. 973 * 974 * void (*ndo_poll_controller)(struct net_device *dev); 975 * 976 * SR-IOV management functions. 977 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac); 978 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, 979 * u8 qos, __be16 proto); 980 * int (*ndo_set_vf_rate)(struct net_device *dev, int vf, int min_tx_rate, 981 * int max_tx_rate); 982 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting); 983 * int (*ndo_set_vf_trust)(struct net_device *dev, int vf, bool setting); 984 * int (*ndo_get_vf_config)(struct net_device *dev, 985 * int vf, struct ifla_vf_info *ivf); 986 * int (*ndo_set_vf_link_state)(struct net_device *dev, int vf, int link_state); 987 * int (*ndo_set_vf_port)(struct net_device *dev, int vf, 988 * struct nlattr *port[]); 989 * 990 * Enable or disable the VF ability to query its RSS Redirection Table and 991 * Hash Key. This is needed since on some devices VF share this information 992 * with PF and querying it may introduce a theoretical security risk. 993 * int (*ndo_set_vf_rss_query_en)(struct net_device *dev, int vf, bool setting); 994 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb); 995 * int (*ndo_setup_tc)(struct net_device *dev, enum tc_setup_type type, 996 * void *type_data); 997 * Called to setup any 'tc' scheduler, classifier or action on @dev. 998 * This is always called from the stack with the rtnl lock held and netif 999 * tx queues stopped. This allows the netdevice to perform queue 1000 * management safely. 1001 * 1002 * Fiber Channel over Ethernet (FCoE) offload functions. 1003 * int (*ndo_fcoe_enable)(struct net_device *dev); 1004 * Called when the FCoE protocol stack wants to start using LLD for FCoE 1005 * so the underlying device can perform whatever needed configuration or 1006 * initialization to support acceleration of FCoE traffic. 1007 * 1008 * int (*ndo_fcoe_disable)(struct net_device *dev); 1009 * Called when the FCoE protocol stack wants to stop using LLD for FCoE 1010 * so the underlying device can perform whatever needed clean-ups to 1011 * stop supporting acceleration of FCoE traffic. 1012 * 1013 * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid, 1014 * struct scatterlist *sgl, unsigned int sgc); 1015 * Called when the FCoE Initiator 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_ddp_done)(struct net_device *dev, u16 xid); 1021 * Called when the FCoE Initiator/Target is done with the DDPed I/O as 1022 * indicated by the FC exchange id 'xid', so the underlying device can 1023 * clean up and reuse resources for later DDP requests. 1024 * 1025 * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid, 1026 * struct scatterlist *sgl, unsigned int sgc); 1027 * Called when the FCoE Target wants to initialize an I/O that 1028 * is a possible candidate for Direct Data Placement (DDP). The LLD can 1029 * perform necessary setup and returns 1 to indicate the device is set up 1030 * successfully to perform DDP on this I/O, otherwise this returns 0. 1031 * 1032 * int (*ndo_fcoe_get_hbainfo)(struct net_device *dev, 1033 * struct netdev_fcoe_hbainfo *hbainfo); 1034 * Called when the FCoE Protocol stack wants information on the underlying 1035 * device. This information is utilized by the FCoE protocol stack to 1036 * register attributes with Fiber Channel management service as per the 1037 * FC-GS Fabric Device Management Information(FDMI) specification. 1038 * 1039 * int (*ndo_fcoe_get_wwn)(struct net_device *dev, u64 *wwn, int type); 1040 * Called when the underlying device wants to override default World Wide 1041 * Name (WWN) generation mechanism in FCoE protocol stack to pass its own 1042 * World Wide Port Name (WWPN) or World Wide Node Name (WWNN) to the FCoE 1043 * protocol stack to use. 1044 * 1045 * RFS acceleration. 1046 * int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb, 1047 * u16 rxq_index, u32 flow_id); 1048 * Set hardware filter for RFS. rxq_index is the target queue index; 1049 * flow_id is a flow ID to be passed to rps_may_expire_flow() later. 1050 * Return the filter ID on success, or a negative error code. 1051 * 1052 * Slave management functions (for bridge, bonding, etc). 1053 * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev); 1054 * Called to make another netdev an underling. 1055 * 1056 * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev); 1057 * Called to release previously enslaved netdev. 1058 * 1059 * Feature/offload setting functions. 1060 * netdev_features_t (*ndo_fix_features)(struct net_device *dev, 1061 * netdev_features_t features); 1062 * Adjusts the requested feature flags according to device-specific 1063 * constraints, and returns the resulting flags. Must not modify 1064 * the device state. 1065 * 1066 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features); 1067 * Called to update device configuration to new features. Passed 1068 * feature set might be less than what was returned by ndo_fix_features()). 1069 * Must return >0 or -errno if it changed dev->features itself. 1070 * 1071 * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[], 1072 * struct net_device *dev, 1073 * const unsigned char *addr, u16 vid, u16 flags) 1074 * Adds an FDB entry to dev for addr. 1075 * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[], 1076 * struct net_device *dev, 1077 * const unsigned char *addr, u16 vid) 1078 * Deletes the FDB entry from dev coresponding to addr. 1079 * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb, 1080 * struct net_device *dev, struct net_device *filter_dev, 1081 * int *idx) 1082 * Used to add FDB entries to dump requests. Implementers should add 1083 * entries to skb and update idx with the number of entries. 1084 * 1085 * int (*ndo_bridge_setlink)(struct net_device *dev, struct nlmsghdr *nlh, 1086 * u16 flags) 1087 * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq, 1088 * struct net_device *dev, u32 filter_mask, 1089 * int nlflags) 1090 * int (*ndo_bridge_dellink)(struct net_device *dev, struct nlmsghdr *nlh, 1091 * u16 flags); 1092 * 1093 * int (*ndo_change_carrier)(struct net_device *dev, bool new_carrier); 1094 * Called to change device carrier. Soft-devices (like dummy, team, etc) 1095 * which do not represent real hardware may define this to allow their 1096 * userspace components to manage their virtual carrier state. Devices 1097 * that determine carrier state from physical hardware properties (eg 1098 * network cables) or protocol-dependent mechanisms (eg 1099 * USB_CDC_NOTIFY_NETWORK_CONNECTION) should NOT implement this function. 1100 * 1101 * int (*ndo_get_phys_port_id)(struct net_device *dev, 1102 * struct netdev_phys_item_id *ppid); 1103 * Called to get ID of physical port of this device. If driver does 1104 * not implement this, it is assumed that the hw is not able to have 1105 * multiple net devices on single physical port. 1106 * 1107 * void (*ndo_udp_tunnel_add)(struct net_device *dev, 1108 * struct udp_tunnel_info *ti); 1109 * Called by UDP tunnel to notify a driver about the UDP port and socket 1110 * address family that a UDP tunnel is listnening to. It is called only 1111 * when a new port starts listening. The operation is protected by the 1112 * RTNL. 1113 * 1114 * void (*ndo_udp_tunnel_del)(struct net_device *dev, 1115 * struct udp_tunnel_info *ti); 1116 * Called by UDP tunnel to notify the driver about a UDP port and socket 1117 * address family that the UDP tunnel is not listening to anymore. The 1118 * operation is protected by the RTNL. 1119 * 1120 * void* (*ndo_dfwd_add_station)(struct net_device *pdev, 1121 * struct net_device *dev) 1122 * Called by upper layer devices to accelerate switching or other 1123 * station functionality into hardware. 'pdev is the lowerdev 1124 * to use for the offload and 'dev' is the net device that will 1125 * back the offload. Returns a pointer to the private structure 1126 * the upper layer will maintain. 1127 * void (*ndo_dfwd_del_station)(struct net_device *pdev, void *priv) 1128 * Called by upper layer device to delete the station created 1129 * by 'ndo_dfwd_add_station'. 'pdev' is the net device backing 1130 * the station and priv is the structure returned by the add 1131 * operation. 1132 * int (*ndo_set_tx_maxrate)(struct net_device *dev, 1133 * int queue_index, u32 maxrate); 1134 * Called when a user wants to set a max-rate limitation of specific 1135 * TX queue. 1136 * int (*ndo_get_iflink)(const struct net_device *dev); 1137 * Called to get the iflink value of this device. 1138 * void (*ndo_change_proto_down)(struct net_device *dev, 1139 * bool proto_down); 1140 * This function is used to pass protocol port error state information 1141 * to the switch driver. The switch driver can react to the proto_down 1142 * by doing a phys down on the associated switch port. 1143 * int (*ndo_fill_metadata_dst)(struct net_device *dev, struct sk_buff *skb); 1144 * This function is used to get egress tunnel information for given skb. 1145 * This is useful for retrieving outer tunnel header parameters while 1146 * sampling packet. 1147 * void (*ndo_set_rx_headroom)(struct net_device *dev, int needed_headroom); 1148 * This function is used to specify the headroom that the skb must 1149 * consider when allocation skb during packet reception. Setting 1150 * appropriate rx headroom value allows avoiding skb head copy on 1151 * forward. Setting a negative value resets the rx headroom to the 1152 * default value. 1153 * int (*ndo_bpf)(struct net_device *dev, struct netdev_bpf *bpf); 1154 * This function is used to set or query state related to XDP on the 1155 * netdevice and manage BPF offload. See definition of 1156 * enum bpf_netdev_command for details. 1157 * int (*ndo_xdp_xmit)(struct net_device *dev, struct xdp_buff *xdp); 1158 * This function is used to submit a XDP packet for transmit on a 1159 * netdevice. 1160 * void (*ndo_xdp_flush)(struct net_device *dev); 1161 * This function is used to inform the driver to flush a particular 1162 * xdp tx queue. Must be called on same CPU as xdp_xmit. 1163 */ 1164 struct net_device_ops { 1165 int (*ndo_init)(struct net_device *dev); 1166 void (*ndo_uninit)(struct net_device *dev); 1167 int (*ndo_open)(struct net_device *dev); 1168 int (*ndo_stop)(struct net_device *dev); 1169 netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb, 1170 struct net_device *dev); 1171 netdev_features_t (*ndo_features_check)(struct sk_buff *skb, 1172 struct net_device *dev, 1173 netdev_features_t features); 1174 u16 (*ndo_select_queue)(struct net_device *dev, 1175 struct sk_buff *skb, 1176 void *accel_priv, 1177 select_queue_fallback_t fallback); 1178 void (*ndo_change_rx_flags)(struct net_device *dev, 1179 int flags); 1180 void (*ndo_set_rx_mode)(struct net_device *dev); 1181 int (*ndo_set_mac_address)(struct net_device *dev, 1182 void *addr); 1183 int (*ndo_validate_addr)(struct net_device *dev); 1184 int (*ndo_do_ioctl)(struct net_device *dev, 1185 struct ifreq *ifr, int cmd); 1186 int (*ndo_set_config)(struct net_device *dev, 1187 struct ifmap *map); 1188 int (*ndo_change_mtu)(struct net_device *dev, 1189 int new_mtu); 1190 int (*ndo_neigh_setup)(struct net_device *dev, 1191 struct neigh_parms *); 1192 void (*ndo_tx_timeout) (struct net_device *dev); 1193 1194 void (*ndo_get_stats64)(struct net_device *dev, 1195 struct rtnl_link_stats64 *storage); 1196 bool (*ndo_has_offload_stats)(const struct net_device *dev, int attr_id); 1197 int (*ndo_get_offload_stats)(int attr_id, 1198 const struct net_device *dev, 1199 void *attr_data); 1200 struct net_device_stats* (*ndo_get_stats)(struct net_device *dev); 1201 1202 int (*ndo_vlan_rx_add_vid)(struct net_device *dev, 1203 __be16 proto, u16 vid); 1204 int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, 1205 __be16 proto, u16 vid); 1206 #ifdef CONFIG_NET_POLL_CONTROLLER 1207 void (*ndo_poll_controller)(struct net_device *dev); 1208 int (*ndo_netpoll_setup)(struct net_device *dev, 1209 struct netpoll_info *info); 1210 void (*ndo_netpoll_cleanup)(struct net_device *dev); 1211 #endif 1212 int (*ndo_set_vf_mac)(struct net_device *dev, 1213 int queue, u8 *mac); 1214 int (*ndo_set_vf_vlan)(struct net_device *dev, 1215 int queue, u16 vlan, 1216 u8 qos, __be16 proto); 1217 int (*ndo_set_vf_rate)(struct net_device *dev, 1218 int vf, int min_tx_rate, 1219 int max_tx_rate); 1220 int (*ndo_set_vf_spoofchk)(struct net_device *dev, 1221 int vf, bool setting); 1222 int (*ndo_set_vf_trust)(struct net_device *dev, 1223 int vf, bool setting); 1224 int (*ndo_get_vf_config)(struct net_device *dev, 1225 int vf, 1226 struct ifla_vf_info *ivf); 1227 int (*ndo_set_vf_link_state)(struct net_device *dev, 1228 int vf, int link_state); 1229 int (*ndo_get_vf_stats)(struct net_device *dev, 1230 int vf, 1231 struct ifla_vf_stats 1232 *vf_stats); 1233 int (*ndo_set_vf_port)(struct net_device *dev, 1234 int vf, 1235 struct nlattr *port[]); 1236 int (*ndo_get_vf_port)(struct net_device *dev, 1237 int vf, struct sk_buff *skb); 1238 int (*ndo_set_vf_guid)(struct net_device *dev, 1239 int vf, u64 guid, 1240 int guid_type); 1241 int (*ndo_set_vf_rss_query_en)( 1242 struct net_device *dev, 1243 int vf, bool setting); 1244 int (*ndo_setup_tc)(struct net_device *dev, 1245 enum tc_setup_type type, 1246 void *type_data); 1247 #if IS_ENABLED(CONFIG_FCOE) 1248 int (*ndo_fcoe_enable)(struct net_device *dev); 1249 int (*ndo_fcoe_disable)(struct net_device *dev); 1250 int (*ndo_fcoe_ddp_setup)(struct net_device *dev, 1251 u16 xid, 1252 struct scatterlist *sgl, 1253 unsigned int sgc); 1254 int (*ndo_fcoe_ddp_done)(struct net_device *dev, 1255 u16 xid); 1256 int (*ndo_fcoe_ddp_target)(struct net_device *dev, 1257 u16 xid, 1258 struct scatterlist *sgl, 1259 unsigned int sgc); 1260 int (*ndo_fcoe_get_hbainfo)(struct net_device *dev, 1261 struct netdev_fcoe_hbainfo *hbainfo); 1262 #endif 1263 1264 #if IS_ENABLED(CONFIG_LIBFCOE) 1265 #define NETDEV_FCOE_WWNN 0 1266 #define NETDEV_FCOE_WWPN 1 1267 int (*ndo_fcoe_get_wwn)(struct net_device *dev, 1268 u64 *wwn, int type); 1269 #endif 1270 1271 #ifdef CONFIG_RFS_ACCEL 1272 int (*ndo_rx_flow_steer)(struct net_device *dev, 1273 const struct sk_buff *skb, 1274 u16 rxq_index, 1275 u32 flow_id); 1276 #endif 1277 int (*ndo_add_slave)(struct net_device *dev, 1278 struct net_device *slave_dev, 1279 struct netlink_ext_ack *extack); 1280 int (*ndo_del_slave)(struct net_device *dev, 1281 struct net_device *slave_dev); 1282 netdev_features_t (*ndo_fix_features)(struct net_device *dev, 1283 netdev_features_t features); 1284 int (*ndo_set_features)(struct net_device *dev, 1285 netdev_features_t features); 1286 int (*ndo_neigh_construct)(struct net_device *dev, 1287 struct neighbour *n); 1288 void (*ndo_neigh_destroy)(struct net_device *dev, 1289 struct neighbour *n); 1290 1291 int (*ndo_fdb_add)(struct ndmsg *ndm, 1292 struct nlattr *tb[], 1293 struct net_device *dev, 1294 const unsigned char *addr, 1295 u16 vid, 1296 u16 flags); 1297 int (*ndo_fdb_del)(struct ndmsg *ndm, 1298 struct nlattr *tb[], 1299 struct net_device *dev, 1300 const unsigned char *addr, 1301 u16 vid); 1302 int (*ndo_fdb_dump)(struct sk_buff *skb, 1303 struct netlink_callback *cb, 1304 struct net_device *dev, 1305 struct net_device *filter_dev, 1306 int *idx); 1307 1308 int (*ndo_bridge_setlink)(struct net_device *dev, 1309 struct nlmsghdr *nlh, 1310 u16 flags); 1311 int (*ndo_bridge_getlink)(struct sk_buff *skb, 1312 u32 pid, u32 seq, 1313 struct net_device *dev, 1314 u32 filter_mask, 1315 int nlflags); 1316 int (*ndo_bridge_dellink)(struct net_device *dev, 1317 struct nlmsghdr *nlh, 1318 u16 flags); 1319 int (*ndo_change_carrier)(struct net_device *dev, 1320 bool new_carrier); 1321 int (*ndo_get_phys_port_id)(struct net_device *dev, 1322 struct netdev_phys_item_id *ppid); 1323 int (*ndo_get_phys_port_name)(struct net_device *dev, 1324 char *name, size_t len); 1325 void (*ndo_udp_tunnel_add)(struct net_device *dev, 1326 struct udp_tunnel_info *ti); 1327 void (*ndo_udp_tunnel_del)(struct net_device *dev, 1328 struct udp_tunnel_info *ti); 1329 void* (*ndo_dfwd_add_station)(struct net_device *pdev, 1330 struct net_device *dev); 1331 void (*ndo_dfwd_del_station)(struct net_device *pdev, 1332 void *priv); 1333 1334 int (*ndo_get_lock_subclass)(struct net_device *dev); 1335 int (*ndo_set_tx_maxrate)(struct net_device *dev, 1336 int queue_index, 1337 u32 maxrate); 1338 int (*ndo_get_iflink)(const struct net_device *dev); 1339 int (*ndo_change_proto_down)(struct net_device *dev, 1340 bool proto_down); 1341 int (*ndo_fill_metadata_dst)(struct net_device *dev, 1342 struct sk_buff *skb); 1343 void (*ndo_set_rx_headroom)(struct net_device *dev, 1344 int needed_headroom); 1345 int (*ndo_bpf)(struct net_device *dev, 1346 struct netdev_bpf *bpf); 1347 int (*ndo_xdp_xmit)(struct net_device *dev, 1348 struct xdp_buff *xdp); 1349 void (*ndo_xdp_flush)(struct net_device *dev); 1350 }; 1351 1352 /** 1353 * enum net_device_priv_flags - &struct net_device priv_flags 1354 * 1355 * These are the &struct net_device, they are only set internally 1356 * by drivers and used in the kernel. These flags are invisible to 1357 * userspace; this means that the order of these flags can change 1358 * during any kernel release. 1359 * 1360 * You should have a pretty good reason to be extending these flags. 1361 * 1362 * @IFF_802_1Q_VLAN: 802.1Q VLAN device 1363 * @IFF_EBRIDGE: Ethernet bridging device 1364 * @IFF_BONDING: bonding master or slave 1365 * @IFF_ISATAP: ISATAP interface (RFC4214) 1366 * @IFF_WAN_HDLC: WAN HDLC device 1367 * @IFF_XMIT_DST_RELEASE: dev_hard_start_xmit() is allowed to 1368 * release skb->dst 1369 * @IFF_DONT_BRIDGE: disallow bridging this ether dev 1370 * @IFF_DISABLE_NETPOLL: disable netpoll at run-time 1371 * @IFF_MACVLAN_PORT: device used as macvlan port 1372 * @IFF_BRIDGE_PORT: device used as bridge port 1373 * @IFF_OVS_DATAPATH: device used as Open vSwitch datapath port 1374 * @IFF_TX_SKB_SHARING: The interface supports sharing skbs on transmit 1375 * @IFF_UNICAST_FLT: Supports unicast filtering 1376 * @IFF_TEAM_PORT: device used as team port 1377 * @IFF_SUPP_NOFCS: device supports sending custom FCS 1378 * @IFF_LIVE_ADDR_CHANGE: device supports hardware address 1379 * change when it's running 1380 * @IFF_MACVLAN: Macvlan device 1381 * @IFF_XMIT_DST_RELEASE_PERM: IFF_XMIT_DST_RELEASE not taking into account 1382 * underlying stacked devices 1383 * @IFF_IPVLAN_MASTER: IPvlan master device 1384 * @IFF_IPVLAN_SLAVE: IPvlan slave device 1385 * @IFF_L3MDEV_MASTER: device is an L3 master device 1386 * @IFF_NO_QUEUE: device can run without qdisc attached 1387 * @IFF_OPENVSWITCH: device is a Open vSwitch master 1388 * @IFF_L3MDEV_SLAVE: device is enslaved to an L3 master device 1389 * @IFF_TEAM: device is a team device 1390 * @IFF_RXFH_CONFIGURED: device has had Rx Flow indirection table configured 1391 * @IFF_PHONY_HEADROOM: the headroom value is controlled by an external 1392 * entity (i.e. the master device for bridged veth) 1393 * @IFF_MACSEC: device is a MACsec device 1394 */ 1395 enum netdev_priv_flags { 1396 IFF_802_1Q_VLAN = 1<<0, 1397 IFF_EBRIDGE = 1<<1, 1398 IFF_BONDING = 1<<2, 1399 IFF_ISATAP = 1<<3, 1400 IFF_WAN_HDLC = 1<<4, 1401 IFF_XMIT_DST_RELEASE = 1<<5, 1402 IFF_DONT_BRIDGE = 1<<6, 1403 IFF_DISABLE_NETPOLL = 1<<7, 1404 IFF_MACVLAN_PORT = 1<<8, 1405 IFF_BRIDGE_PORT = 1<<9, 1406 IFF_OVS_DATAPATH = 1<<10, 1407 IFF_TX_SKB_SHARING = 1<<11, 1408 IFF_UNICAST_FLT = 1<<12, 1409 IFF_TEAM_PORT = 1<<13, 1410 IFF_SUPP_NOFCS = 1<<14, 1411 IFF_LIVE_ADDR_CHANGE = 1<<15, 1412 IFF_MACVLAN = 1<<16, 1413 IFF_XMIT_DST_RELEASE_PERM = 1<<17, 1414 IFF_IPVLAN_MASTER = 1<<18, 1415 IFF_IPVLAN_SLAVE = 1<<19, 1416 IFF_L3MDEV_MASTER = 1<<20, 1417 IFF_NO_QUEUE = 1<<21, 1418 IFF_OPENVSWITCH = 1<<22, 1419 IFF_L3MDEV_SLAVE = 1<<23, 1420 IFF_TEAM = 1<<24, 1421 IFF_RXFH_CONFIGURED = 1<<25, 1422 IFF_PHONY_HEADROOM = 1<<26, 1423 IFF_MACSEC = 1<<27, 1424 }; 1425 1426 #define IFF_802_1Q_VLAN IFF_802_1Q_VLAN 1427 #define IFF_EBRIDGE IFF_EBRIDGE 1428 #define IFF_BONDING IFF_BONDING 1429 #define IFF_ISATAP IFF_ISATAP 1430 #define IFF_WAN_HDLC IFF_WAN_HDLC 1431 #define IFF_XMIT_DST_RELEASE IFF_XMIT_DST_RELEASE 1432 #define IFF_DONT_BRIDGE IFF_DONT_BRIDGE 1433 #define IFF_DISABLE_NETPOLL IFF_DISABLE_NETPOLL 1434 #define IFF_MACVLAN_PORT IFF_MACVLAN_PORT 1435 #define IFF_BRIDGE_PORT IFF_BRIDGE_PORT 1436 #define IFF_OVS_DATAPATH IFF_OVS_DATAPATH 1437 #define IFF_TX_SKB_SHARING IFF_TX_SKB_SHARING 1438 #define IFF_UNICAST_FLT IFF_UNICAST_FLT 1439 #define IFF_TEAM_PORT IFF_TEAM_PORT 1440 #define IFF_SUPP_NOFCS IFF_SUPP_NOFCS 1441 #define IFF_LIVE_ADDR_CHANGE IFF_LIVE_ADDR_CHANGE 1442 #define IFF_MACVLAN IFF_MACVLAN 1443 #define IFF_XMIT_DST_RELEASE_PERM IFF_XMIT_DST_RELEASE_PERM 1444 #define IFF_IPVLAN_MASTER IFF_IPVLAN_MASTER 1445 #define IFF_IPVLAN_SLAVE IFF_IPVLAN_SLAVE 1446 #define IFF_L3MDEV_MASTER IFF_L3MDEV_MASTER 1447 #define IFF_NO_QUEUE IFF_NO_QUEUE 1448 #define IFF_OPENVSWITCH IFF_OPENVSWITCH 1449 #define IFF_L3MDEV_SLAVE IFF_L3MDEV_SLAVE 1450 #define IFF_TEAM IFF_TEAM 1451 #define IFF_RXFH_CONFIGURED IFF_RXFH_CONFIGURED 1452 #define IFF_MACSEC IFF_MACSEC 1453 1454 /** 1455 * struct net_device - The DEVICE structure. 1456 * 1457 * Actually, this whole structure is a big mistake. It mixes I/O 1458 * data with strictly "high-level" data, and it has to know about 1459 * almost every data structure used in the INET module. 1460 * 1461 * @name: This is the first field of the "visible" part of this structure 1462 * (i.e. as seen by users in the "Space.c" file). It is the name 1463 * of the interface. 1464 * 1465 * @name_hlist: Device name hash chain, please keep it close to name[] 1466 * @ifalias: SNMP alias 1467 * @mem_end: Shared memory end 1468 * @mem_start: Shared memory start 1469 * @base_addr: Device I/O address 1470 * @irq: Device IRQ number 1471 * 1472 * @carrier_changes: Stats to monitor carrier on<->off transitions 1473 * 1474 * @state: Generic network queuing layer state, see netdev_state_t 1475 * @dev_list: The global list of network devices 1476 * @napi_list: List entry used for polling NAPI devices 1477 * @unreg_list: List entry when we are unregistering the 1478 * device; see the function unregister_netdev 1479 * @close_list: List entry used when we are closing the device 1480 * @ptype_all: Device-specific packet handlers for all protocols 1481 * @ptype_specific: Device-specific, protocol-specific packet handlers 1482 * 1483 * @adj_list: Directly linked devices, like slaves for bonding 1484 * @features: Currently active device features 1485 * @hw_features: User-changeable features 1486 * 1487 * @wanted_features: User-requested features 1488 * @vlan_features: Mask of features inheritable by VLAN devices 1489 * 1490 * @hw_enc_features: Mask of features inherited by encapsulating devices 1491 * This field indicates what encapsulation 1492 * offloads the hardware is capable of doing, 1493 * and drivers will need to set them appropriately. 1494 * 1495 * @mpls_features: Mask of features inheritable by MPLS 1496 * 1497 * @ifindex: interface index 1498 * @group: The group the device belongs to 1499 * 1500 * @stats: Statistics struct, which was left as a legacy, use 1501 * rtnl_link_stats64 instead 1502 * 1503 * @rx_dropped: Dropped packets by core network, 1504 * do not use this in drivers 1505 * @tx_dropped: Dropped packets by core network, 1506 * do not use this in drivers 1507 * @rx_nohandler: nohandler dropped packets by core network on 1508 * inactive devices, do not use this in drivers 1509 * 1510 * @wireless_handlers: List of functions to handle Wireless Extensions, 1511 * instead of ioctl, 1512 * see <net/iw_handler.h> for details. 1513 * @wireless_data: Instance data managed by the core of wireless extensions 1514 * 1515 * @netdev_ops: Includes several pointers to callbacks, 1516 * if one wants to override the ndo_*() functions 1517 * @ethtool_ops: Management operations 1518 * @ndisc_ops: Includes callbacks for different IPv6 neighbour 1519 * discovery handling. Necessary for e.g. 6LoWPAN. 1520 * @header_ops: Includes callbacks for creating,parsing,caching,etc 1521 * of Layer 2 headers. 1522 * 1523 * @flags: Interface flags (a la BSD) 1524 * @priv_flags: Like 'flags' but invisible to userspace, 1525 * see if.h for the definitions 1526 * @gflags: Global flags ( kept as legacy ) 1527 * @padded: How much padding added by alloc_netdev() 1528 * @operstate: RFC2863 operstate 1529 * @link_mode: Mapping policy to operstate 1530 * @if_port: Selectable AUI, TP, ... 1531 * @dma: DMA channel 1532 * @mtu: Interface MTU value 1533 * @min_mtu: Interface Minimum MTU value 1534 * @max_mtu: Interface Maximum MTU value 1535 * @type: Interface hardware type 1536 * @hard_header_len: Maximum hardware header length. 1537 * @min_header_len: Minimum hardware header length 1538 * 1539 * @needed_headroom: Extra headroom the hardware may need, but not in all 1540 * cases can this be guaranteed 1541 * @needed_tailroom: Extra tailroom the hardware may need, but not in all 1542 * cases can this be guaranteed. Some cases also use 1543 * LL_MAX_HEADER instead to allocate the skb 1544 * 1545 * interface address info: 1546 * 1547 * @perm_addr: Permanent hw address 1548 * @addr_assign_type: Hw address assignment type 1549 * @addr_len: Hardware address length 1550 * @neigh_priv_len: Used in neigh_alloc() 1551 * @dev_id: Used to differentiate devices that share 1552 * the same link layer address 1553 * @dev_port: Used to differentiate devices that share 1554 * the same function 1555 * @addr_list_lock: XXX: need comments on this one 1556 * @uc_promisc: Counter that indicates promiscuous mode 1557 * has been enabled due to the need to listen to 1558 * additional unicast addresses in a device that 1559 * does not implement ndo_set_rx_mode() 1560 * @uc: unicast mac addresses 1561 * @mc: multicast mac addresses 1562 * @dev_addrs: list of device hw addresses 1563 * @queues_kset: Group of all Kobjects in the Tx and RX queues 1564 * @promiscuity: Number of times the NIC is told to work in 1565 * promiscuous mode; if it becomes 0 the NIC will 1566 * exit promiscuous mode 1567 * @allmulti: Counter, enables or disables allmulticast mode 1568 * 1569 * @vlan_info: VLAN info 1570 * @dsa_ptr: dsa specific data 1571 * @tipc_ptr: TIPC specific data 1572 * @atalk_ptr: AppleTalk link 1573 * @ip_ptr: IPv4 specific data 1574 * @dn_ptr: DECnet specific data 1575 * @ip6_ptr: IPv6 specific data 1576 * @ax25_ptr: AX.25 specific data 1577 * @ieee80211_ptr: IEEE 802.11 specific data, assign before registering 1578 * 1579 * @dev_addr: Hw address (before bcast, 1580 * because most packets are unicast) 1581 * 1582 * @_rx: Array of RX queues 1583 * @num_rx_queues: Number of RX queues 1584 * allocated at register_netdev() time 1585 * @real_num_rx_queues: Number of RX queues currently active in device 1586 * 1587 * @rx_handler: handler for received packets 1588 * @rx_handler_data: XXX: need comments on this one 1589 * @miniq_ingress: ingress/clsact qdisc specific data for 1590 * ingress processing 1591 * @ingress_queue: XXX: need comments on this one 1592 * @broadcast: hw bcast address 1593 * 1594 * @rx_cpu_rmap: CPU reverse-mapping for RX completion interrupts, 1595 * indexed by RX queue number. Assigned by driver. 1596 * This must only be set if the ndo_rx_flow_steer 1597 * operation is defined 1598 * @index_hlist: Device index hash chain 1599 * 1600 * @_tx: Array of TX queues 1601 * @num_tx_queues: Number of TX queues allocated at alloc_netdev_mq() time 1602 * @real_num_tx_queues: Number of TX queues currently active in device 1603 * @qdisc: Root qdisc from userspace point of view 1604 * @tx_queue_len: Max frames per queue allowed 1605 * @tx_global_lock: XXX: need comments on this one 1606 * 1607 * @xps_maps: XXX: need comments on this one 1608 * @miniq_egress: clsact qdisc specific data for 1609 * egress processing 1610 * @watchdog_timeo: Represents the timeout that is used by 1611 * the watchdog (see dev_watchdog()) 1612 * @watchdog_timer: List of timers 1613 * 1614 * @pcpu_refcnt: Number of references to this device 1615 * @todo_list: Delayed register/unregister 1616 * @link_watch_list: XXX: need comments on this one 1617 * 1618 * @reg_state: Register/unregister state machine 1619 * @dismantle: Device is going to be freed 1620 * @rtnl_link_state: This enum represents the phases of creating 1621 * a new link 1622 * 1623 * @needs_free_netdev: Should unregister perform free_netdev? 1624 * @priv_destructor: Called from unregister 1625 * @npinfo: XXX: need comments on this one 1626 * @nd_net: Network namespace this network device is inside 1627 * 1628 * @ml_priv: Mid-layer private 1629 * @lstats: Loopback statistics 1630 * @tstats: Tunnel statistics 1631 * @dstats: Dummy statistics 1632 * @vstats: Virtual ethernet statistics 1633 * 1634 * @garp_port: GARP 1635 * @mrp_port: MRP 1636 * 1637 * @dev: Class/net/name entry 1638 * @sysfs_groups: Space for optional device, statistics and wireless 1639 * sysfs groups 1640 * 1641 * @sysfs_rx_queue_group: Space for optional per-rx queue attributes 1642 * @rtnl_link_ops: Rtnl_link_ops 1643 * 1644 * @gso_max_size: Maximum size of generic segmentation offload 1645 * @gso_max_segs: Maximum number of segments that can be passed to the 1646 * NIC for GSO 1647 * 1648 * @dcbnl_ops: Data Center Bridging netlink ops 1649 * @num_tc: Number of traffic classes in the net device 1650 * @tc_to_txq: XXX: need comments on this one 1651 * @prio_tc_map: XXX: need comments on this one 1652 * 1653 * @fcoe_ddp_xid: Max exchange id for FCoE LRO by ddp 1654 * 1655 * @priomap: XXX: need comments on this one 1656 * @phydev: Physical device may attach itself 1657 * for hardware timestamping 1658 * 1659 * @qdisc_tx_busylock: lockdep class annotating Qdisc->busylock spinlock 1660 * @qdisc_running_key: lockdep class annotating Qdisc->running seqcount 1661 * 1662 * @proto_down: protocol port state information can be sent to the 1663 * switch driver and used to set the phys state of the 1664 * switch port. 1665 * 1666 * FIXME: cleanup struct net_device such that network protocol info 1667 * moves out. 1668 */ 1669 1670 struct net_device { 1671 char name[IFNAMSIZ]; 1672 struct hlist_node name_hlist; 1673 struct dev_ifalias __rcu *ifalias; 1674 /* 1675 * I/O specific fields 1676 * FIXME: Merge these and struct ifmap into one 1677 */ 1678 unsigned long mem_end; 1679 unsigned long mem_start; 1680 unsigned long base_addr; 1681 int irq; 1682 1683 atomic_t carrier_changes; 1684 1685 /* 1686 * Some hardware also needs these fields (state,dev_list, 1687 * napi_list,unreg_list,close_list) but they are not 1688 * part of the usual set specified in Space.c. 1689 */ 1690 1691 unsigned long state; 1692 1693 struct list_head dev_list; 1694 struct list_head napi_list; 1695 struct list_head unreg_list; 1696 struct list_head close_list; 1697 struct list_head ptype_all; 1698 struct list_head ptype_specific; 1699 1700 struct { 1701 struct list_head upper; 1702 struct list_head lower; 1703 } adj_list; 1704 1705 netdev_features_t features; 1706 netdev_features_t hw_features; 1707 netdev_features_t wanted_features; 1708 netdev_features_t vlan_features; 1709 netdev_features_t hw_enc_features; 1710 netdev_features_t mpls_features; 1711 netdev_features_t gso_partial_features; 1712 1713 int ifindex; 1714 int group; 1715 1716 struct net_device_stats stats; 1717 1718 atomic_long_t rx_dropped; 1719 atomic_long_t tx_dropped; 1720 atomic_long_t rx_nohandler; 1721 1722 #ifdef CONFIG_WIRELESS_EXT 1723 const struct iw_handler_def *wireless_handlers; 1724 struct iw_public_data *wireless_data; 1725 #endif 1726 const struct net_device_ops *netdev_ops; 1727 const struct ethtool_ops *ethtool_ops; 1728 #ifdef CONFIG_NET_SWITCHDEV 1729 const struct switchdev_ops *switchdev_ops; 1730 #endif 1731 #ifdef CONFIG_NET_L3_MASTER_DEV 1732 const struct l3mdev_ops *l3mdev_ops; 1733 #endif 1734 #if IS_ENABLED(CONFIG_IPV6) 1735 const struct ndisc_ops *ndisc_ops; 1736 #endif 1737 1738 #ifdef CONFIG_XFRM_OFFLOAD 1739 const struct xfrmdev_ops *xfrmdev_ops; 1740 #endif 1741 1742 const struct header_ops *header_ops; 1743 1744 unsigned int flags; 1745 unsigned int priv_flags; 1746 1747 unsigned short gflags; 1748 unsigned short padded; 1749 1750 unsigned char operstate; 1751 unsigned char link_mode; 1752 1753 unsigned char if_port; 1754 unsigned char dma; 1755 1756 unsigned int mtu; 1757 unsigned int min_mtu; 1758 unsigned int max_mtu; 1759 unsigned short type; 1760 unsigned short hard_header_len; 1761 unsigned char min_header_len; 1762 1763 unsigned short needed_headroom; 1764 unsigned short needed_tailroom; 1765 1766 /* Interface address info. */ 1767 unsigned char perm_addr[MAX_ADDR_LEN]; 1768 unsigned char addr_assign_type; 1769 unsigned char addr_len; 1770 unsigned short neigh_priv_len; 1771 unsigned short dev_id; 1772 unsigned short dev_port; 1773 spinlock_t addr_list_lock; 1774 unsigned char name_assign_type; 1775 bool uc_promisc; 1776 struct netdev_hw_addr_list uc; 1777 struct netdev_hw_addr_list mc; 1778 struct netdev_hw_addr_list dev_addrs; 1779 1780 #ifdef CONFIG_SYSFS 1781 struct kset *queues_kset; 1782 #endif 1783 unsigned int promiscuity; 1784 unsigned int allmulti; 1785 1786 1787 /* Protocol-specific pointers */ 1788 1789 #if IS_ENABLED(CONFIG_VLAN_8021Q) 1790 struct vlan_info __rcu *vlan_info; 1791 #endif 1792 #if IS_ENABLED(CONFIG_NET_DSA) 1793 struct dsa_port *dsa_ptr; 1794 #endif 1795 #if IS_ENABLED(CONFIG_TIPC) 1796 struct tipc_bearer __rcu *tipc_ptr; 1797 #endif 1798 void *atalk_ptr; 1799 struct in_device __rcu *ip_ptr; 1800 struct dn_dev __rcu *dn_ptr; 1801 struct inet6_dev __rcu *ip6_ptr; 1802 void *ax25_ptr; 1803 struct wireless_dev *ieee80211_ptr; 1804 struct wpan_dev *ieee802154_ptr; 1805 #if IS_ENABLED(CONFIG_MPLS_ROUTING) 1806 struct mpls_dev __rcu *mpls_ptr; 1807 #endif 1808 1809 /* 1810 * Cache lines mostly used on receive path (including eth_type_trans()) 1811 */ 1812 /* Interface address info used in eth_type_trans() */ 1813 unsigned char *dev_addr; 1814 1815 struct netdev_rx_queue *_rx; 1816 unsigned int num_rx_queues; 1817 unsigned int real_num_rx_queues; 1818 1819 struct bpf_prog __rcu *xdp_prog; 1820 unsigned long gro_flush_timeout; 1821 rx_handler_func_t __rcu *rx_handler; 1822 void __rcu *rx_handler_data; 1823 1824 #ifdef CONFIG_NET_CLS_ACT 1825 struct mini_Qdisc __rcu *miniq_ingress; 1826 #endif 1827 struct netdev_queue __rcu *ingress_queue; 1828 #ifdef CONFIG_NETFILTER_INGRESS 1829 struct nf_hook_entries __rcu *nf_hooks_ingress; 1830 #endif 1831 1832 unsigned char broadcast[MAX_ADDR_LEN]; 1833 #ifdef CONFIG_RFS_ACCEL 1834 struct cpu_rmap *rx_cpu_rmap; 1835 #endif 1836 struct hlist_node index_hlist; 1837 1838 /* 1839 * Cache lines mostly used on transmit path 1840 */ 1841 struct netdev_queue *_tx ____cacheline_aligned_in_smp; 1842 unsigned int num_tx_queues; 1843 unsigned int real_num_tx_queues; 1844 struct Qdisc *qdisc; 1845 #ifdef CONFIG_NET_SCHED 1846 DECLARE_HASHTABLE (qdisc_hash, 4); 1847 #endif 1848 unsigned int tx_queue_len; 1849 spinlock_t tx_global_lock; 1850 int watchdog_timeo; 1851 1852 #ifdef CONFIG_XPS 1853 struct xps_dev_maps __rcu *xps_maps; 1854 #endif 1855 #ifdef CONFIG_NET_CLS_ACT 1856 struct mini_Qdisc __rcu *miniq_egress; 1857 #endif 1858 1859 /* These may be needed for future network-power-down code. */ 1860 struct timer_list watchdog_timer; 1861 1862 int __percpu *pcpu_refcnt; 1863 struct list_head todo_list; 1864 1865 struct list_head link_watch_list; 1866 1867 enum { NETREG_UNINITIALIZED=0, 1868 NETREG_REGISTERED, /* completed register_netdevice */ 1869 NETREG_UNREGISTERING, /* called unregister_netdevice */ 1870 NETREG_UNREGISTERED, /* completed unregister todo */ 1871 NETREG_RELEASED, /* called free_netdev */ 1872 NETREG_DUMMY, /* dummy device for NAPI poll */ 1873 } reg_state:8; 1874 1875 bool dismantle; 1876 1877 enum { 1878 RTNL_LINK_INITIALIZED, 1879 RTNL_LINK_INITIALIZING, 1880 } rtnl_link_state:16; 1881 1882 bool needs_free_netdev; 1883 void (*priv_destructor)(struct net_device *dev); 1884 1885 #ifdef CONFIG_NETPOLL 1886 struct netpoll_info __rcu *npinfo; 1887 #endif 1888 1889 possible_net_t nd_net; 1890 1891 /* mid-layer private */ 1892 union { 1893 void *ml_priv; 1894 struct pcpu_lstats __percpu *lstats; 1895 struct pcpu_sw_netstats __percpu *tstats; 1896 struct pcpu_dstats __percpu *dstats; 1897 struct pcpu_vstats __percpu *vstats; 1898 }; 1899 1900 #if IS_ENABLED(CONFIG_GARP) 1901 struct garp_port __rcu *garp_port; 1902 #endif 1903 #if IS_ENABLED(CONFIG_MRP) 1904 struct mrp_port __rcu *mrp_port; 1905 #endif 1906 1907 struct device dev; 1908 const struct attribute_group *sysfs_groups[4]; 1909 const struct attribute_group *sysfs_rx_queue_group; 1910 1911 const struct rtnl_link_ops *rtnl_link_ops; 1912 1913 /* for setting kernel sock attribute on TCP connection setup */ 1914 #define GSO_MAX_SIZE 65536 1915 unsigned int gso_max_size; 1916 #define GSO_MAX_SEGS 65535 1917 u16 gso_max_segs; 1918 1919 #ifdef CONFIG_DCB 1920 const struct dcbnl_rtnl_ops *dcbnl_ops; 1921 #endif 1922 u8 num_tc; 1923 struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE]; 1924 u8 prio_tc_map[TC_BITMASK + 1]; 1925 1926 #if IS_ENABLED(CONFIG_FCOE) 1927 unsigned int fcoe_ddp_xid; 1928 #endif 1929 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) 1930 struct netprio_map __rcu *priomap; 1931 #endif 1932 struct phy_device *phydev; 1933 struct lock_class_key *qdisc_tx_busylock; 1934 struct lock_class_key *qdisc_running_key; 1935 bool proto_down; 1936 }; 1937 #define to_net_dev(d) container_of(d, struct net_device, dev) 1938 1939 static inline bool netif_elide_gro(const struct net_device *dev) 1940 { 1941 if (!(dev->features & NETIF_F_GRO) || dev->xdp_prog) 1942 return true; 1943 return false; 1944 } 1945 1946 #define NETDEV_ALIGN 32 1947 1948 static inline 1949 int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio) 1950 { 1951 return dev->prio_tc_map[prio & TC_BITMASK]; 1952 } 1953 1954 static inline 1955 int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc) 1956 { 1957 if (tc >= dev->num_tc) 1958 return -EINVAL; 1959 1960 dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK; 1961 return 0; 1962 } 1963 1964 int netdev_txq_to_tc(struct net_device *dev, unsigned int txq); 1965 void netdev_reset_tc(struct net_device *dev); 1966 int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset); 1967 int netdev_set_num_tc(struct net_device *dev, u8 num_tc); 1968 1969 static inline 1970 int netdev_get_num_tc(struct net_device *dev) 1971 { 1972 return dev->num_tc; 1973 } 1974 1975 static inline 1976 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev, 1977 unsigned int index) 1978 { 1979 return &dev->_tx[index]; 1980 } 1981 1982 static inline struct netdev_queue *skb_get_tx_queue(const struct net_device *dev, 1983 const struct sk_buff *skb) 1984 { 1985 return netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); 1986 } 1987 1988 static inline void netdev_for_each_tx_queue(struct net_device *dev, 1989 void (*f)(struct net_device *, 1990 struct netdev_queue *, 1991 void *), 1992 void *arg) 1993 { 1994 unsigned int i; 1995 1996 for (i = 0; i < dev->num_tx_queues; i++) 1997 f(dev, &dev->_tx[i], arg); 1998 } 1999 2000 #define netdev_lockdep_set_classes(dev) \ 2001 { \ 2002 static struct lock_class_key qdisc_tx_busylock_key; \ 2003 static struct lock_class_key qdisc_running_key; \ 2004 static struct lock_class_key qdisc_xmit_lock_key; \ 2005 static struct lock_class_key dev_addr_list_lock_key; \ 2006 unsigned int i; \ 2007 \ 2008 (dev)->qdisc_tx_busylock = &qdisc_tx_busylock_key; \ 2009 (dev)->qdisc_running_key = &qdisc_running_key; \ 2010 lockdep_set_class(&(dev)->addr_list_lock, \ 2011 &dev_addr_list_lock_key); \ 2012 for (i = 0; i < (dev)->num_tx_queues; i++) \ 2013 lockdep_set_class(&(dev)->_tx[i]._xmit_lock, \ 2014 &qdisc_xmit_lock_key); \ 2015 } 2016 2017 struct netdev_queue *netdev_pick_tx(struct net_device *dev, 2018 struct sk_buff *skb, 2019 void *accel_priv); 2020 2021 /* returns the headroom that the master device needs to take in account 2022 * when forwarding to this dev 2023 */ 2024 static inline unsigned netdev_get_fwd_headroom(struct net_device *dev) 2025 { 2026 return dev->priv_flags & IFF_PHONY_HEADROOM ? 0 : dev->needed_headroom; 2027 } 2028 2029 static inline void netdev_set_rx_headroom(struct net_device *dev, int new_hr) 2030 { 2031 if (dev->netdev_ops->ndo_set_rx_headroom) 2032 dev->netdev_ops->ndo_set_rx_headroom(dev, new_hr); 2033 } 2034 2035 /* set the device rx headroom to the dev's default */ 2036 static inline void netdev_reset_rx_headroom(struct net_device *dev) 2037 { 2038 netdev_set_rx_headroom(dev, -1); 2039 } 2040 2041 /* 2042 * Net namespace inlines 2043 */ 2044 static inline 2045 struct net *dev_net(const struct net_device *dev) 2046 { 2047 return read_pnet(&dev->nd_net); 2048 } 2049 2050 static inline 2051 void dev_net_set(struct net_device *dev, struct net *net) 2052 { 2053 write_pnet(&dev->nd_net, net); 2054 } 2055 2056 /** 2057 * netdev_priv - access network device private data 2058 * @dev: network device 2059 * 2060 * Get network device private data 2061 */ 2062 static inline void *netdev_priv(const struct net_device *dev) 2063 { 2064 return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN); 2065 } 2066 2067 /* Set the sysfs physical device reference for the network logical device 2068 * if set prior to registration will cause a symlink during initialization. 2069 */ 2070 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) 2071 2072 /* Set the sysfs device type for the network logical device to allow 2073 * fine-grained identification of different network device types. For 2074 * example Ethernet, Wireless LAN, Bluetooth, WiMAX etc. 2075 */ 2076 #define SET_NETDEV_DEVTYPE(net, devtype) ((net)->dev.type = (devtype)) 2077 2078 /* Default NAPI poll() weight 2079 * Device drivers are strongly advised to not use bigger value 2080 */ 2081 #define NAPI_POLL_WEIGHT 64 2082 2083 /** 2084 * netif_napi_add - initialize a NAPI context 2085 * @dev: network device 2086 * @napi: NAPI context 2087 * @poll: polling function 2088 * @weight: default weight 2089 * 2090 * netif_napi_add() must be used to initialize a NAPI context prior to calling 2091 * *any* of the other NAPI-related functions. 2092 */ 2093 void netif_napi_add(struct net_device *dev, struct napi_struct *napi, 2094 int (*poll)(struct napi_struct *, int), int weight); 2095 2096 /** 2097 * netif_tx_napi_add - initialize a NAPI context 2098 * @dev: network device 2099 * @napi: NAPI context 2100 * @poll: polling function 2101 * @weight: default weight 2102 * 2103 * This variant of netif_napi_add() should be used from drivers using NAPI 2104 * to exclusively poll a TX queue. 2105 * This will avoid we add it into napi_hash[], thus polluting this hash table. 2106 */ 2107 static inline void netif_tx_napi_add(struct net_device *dev, 2108 struct napi_struct *napi, 2109 int (*poll)(struct napi_struct *, int), 2110 int weight) 2111 { 2112 set_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state); 2113 netif_napi_add(dev, napi, poll, weight); 2114 } 2115 2116 /** 2117 * netif_napi_del - remove a NAPI context 2118 * @napi: NAPI context 2119 * 2120 * netif_napi_del() removes a NAPI context from the network device NAPI list 2121 */ 2122 void netif_napi_del(struct napi_struct *napi); 2123 2124 struct napi_gro_cb { 2125 /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */ 2126 void *frag0; 2127 2128 /* Length of frag0. */ 2129 unsigned int frag0_len; 2130 2131 /* This indicates where we are processing relative to skb->data. */ 2132 int data_offset; 2133 2134 /* This is non-zero if the packet cannot be merged with the new skb. */ 2135 u16 flush; 2136 2137 /* Save the IP ID here and check when we get to the transport layer */ 2138 u16 flush_id; 2139 2140 /* Number of segments aggregated. */ 2141 u16 count; 2142 2143 /* Start offset for remote checksum offload */ 2144 u16 gro_remcsum_start; 2145 2146 /* jiffies when first packet was created/queued */ 2147 unsigned long age; 2148 2149 /* Used in ipv6_gro_receive() and foo-over-udp */ 2150 u16 proto; 2151 2152 /* This is non-zero if the packet may be of the same flow. */ 2153 u8 same_flow:1; 2154 2155 /* Used in tunnel GRO receive */ 2156 u8 encap_mark:1; 2157 2158 /* GRO checksum is valid */ 2159 u8 csum_valid:1; 2160 2161 /* Number of checksums via CHECKSUM_UNNECESSARY */ 2162 u8 csum_cnt:3; 2163 2164 /* Free the skb? */ 2165 u8 free:2; 2166 #define NAPI_GRO_FREE 1 2167 #define NAPI_GRO_FREE_STOLEN_HEAD 2 2168 2169 /* Used in foo-over-udp, set in udp[46]_gro_receive */ 2170 u8 is_ipv6:1; 2171 2172 /* Used in GRE, set in fou/gue_gro_receive */ 2173 u8 is_fou:1; 2174 2175 /* Used to determine if flush_id can be ignored */ 2176 u8 is_atomic:1; 2177 2178 /* Number of gro_receive callbacks this packet already went through */ 2179 u8 recursion_counter:4; 2180 2181 /* 1 bit hole */ 2182 2183 /* used to support CHECKSUM_COMPLETE for tunneling protocols */ 2184 __wsum csum; 2185 2186 /* used in skb_gro_receive() slow path */ 2187 struct sk_buff *last; 2188 }; 2189 2190 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb) 2191 2192 #define GRO_RECURSION_LIMIT 15 2193 static inline int gro_recursion_inc_test(struct sk_buff *skb) 2194 { 2195 return ++NAPI_GRO_CB(skb)->recursion_counter == GRO_RECURSION_LIMIT; 2196 } 2197 2198 typedef struct sk_buff **(*gro_receive_t)(struct sk_buff **, struct sk_buff *); 2199 static inline struct sk_buff **call_gro_receive(gro_receive_t cb, 2200 struct sk_buff **head, 2201 struct sk_buff *skb) 2202 { 2203 if (unlikely(gro_recursion_inc_test(skb))) { 2204 NAPI_GRO_CB(skb)->flush |= 1; 2205 return NULL; 2206 } 2207 2208 return cb(head, skb); 2209 } 2210 2211 typedef struct sk_buff **(*gro_receive_sk_t)(struct sock *, struct sk_buff **, 2212 struct sk_buff *); 2213 static inline struct sk_buff **call_gro_receive_sk(gro_receive_sk_t cb, 2214 struct sock *sk, 2215 struct sk_buff **head, 2216 struct sk_buff *skb) 2217 { 2218 if (unlikely(gro_recursion_inc_test(skb))) { 2219 NAPI_GRO_CB(skb)->flush |= 1; 2220 return NULL; 2221 } 2222 2223 return cb(sk, head, skb); 2224 } 2225 2226 struct packet_type { 2227 __be16 type; /* This is really htons(ether_type). */ 2228 struct net_device *dev; /* NULL is wildcarded here */ 2229 int (*func) (struct sk_buff *, 2230 struct net_device *, 2231 struct packet_type *, 2232 struct net_device *); 2233 bool (*id_match)(struct packet_type *ptype, 2234 struct sock *sk); 2235 void *af_packet_priv; 2236 struct list_head list; 2237 }; 2238 2239 struct offload_callbacks { 2240 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 2241 netdev_features_t features); 2242 struct sk_buff **(*gro_receive)(struct sk_buff **head, 2243 struct sk_buff *skb); 2244 int (*gro_complete)(struct sk_buff *skb, int nhoff); 2245 }; 2246 2247 struct packet_offload { 2248 __be16 type; /* This is really htons(ether_type). */ 2249 u16 priority; 2250 struct offload_callbacks callbacks; 2251 struct list_head list; 2252 }; 2253 2254 /* often modified stats are per-CPU, other are shared (netdev->stats) */ 2255 struct pcpu_sw_netstats { 2256 u64 rx_packets; 2257 u64 rx_bytes; 2258 u64 tx_packets; 2259 u64 tx_bytes; 2260 struct u64_stats_sync syncp; 2261 }; 2262 2263 #define __netdev_alloc_pcpu_stats(type, gfp) \ 2264 ({ \ 2265 typeof(type) __percpu *pcpu_stats = alloc_percpu_gfp(type, gfp);\ 2266 if (pcpu_stats) { \ 2267 int __cpu; \ 2268 for_each_possible_cpu(__cpu) { \ 2269 typeof(type) *stat; \ 2270 stat = per_cpu_ptr(pcpu_stats, __cpu); \ 2271 u64_stats_init(&stat->syncp); \ 2272 } \ 2273 } \ 2274 pcpu_stats; \ 2275 }) 2276 2277 #define netdev_alloc_pcpu_stats(type) \ 2278 __netdev_alloc_pcpu_stats(type, GFP_KERNEL) 2279 2280 enum netdev_lag_tx_type { 2281 NETDEV_LAG_TX_TYPE_UNKNOWN, 2282 NETDEV_LAG_TX_TYPE_RANDOM, 2283 NETDEV_LAG_TX_TYPE_BROADCAST, 2284 NETDEV_LAG_TX_TYPE_ROUNDROBIN, 2285 NETDEV_LAG_TX_TYPE_ACTIVEBACKUP, 2286 NETDEV_LAG_TX_TYPE_HASH, 2287 }; 2288 2289 struct netdev_lag_upper_info { 2290 enum netdev_lag_tx_type tx_type; 2291 }; 2292 2293 struct netdev_lag_lower_state_info { 2294 u8 link_up : 1, 2295 tx_enabled : 1; 2296 }; 2297 2298 #include <linux/notifier.h> 2299 2300 /* netdevice notifier chain. Please remember to update the rtnetlink 2301 * notification exclusion list in rtnetlink_event() when adding new 2302 * types. 2303 */ 2304 #define NETDEV_UP 0x0001 /* For now you can't veto a device up/down */ 2305 #define NETDEV_DOWN 0x0002 2306 #define NETDEV_REBOOT 0x0003 /* Tell a protocol stack a network interface 2307 detected a hardware crash and restarted 2308 - we can use this eg to kick tcp sessions 2309 once done */ 2310 #define NETDEV_CHANGE 0x0004 /* Notify device state change */ 2311 #define NETDEV_REGISTER 0x0005 2312 #define NETDEV_UNREGISTER 0x0006 2313 #define NETDEV_CHANGEMTU 0x0007 /* notify after mtu change happened */ 2314 #define NETDEV_CHANGEADDR 0x0008 2315 #define NETDEV_GOING_DOWN 0x0009 2316 #define NETDEV_CHANGENAME 0x000A 2317 #define NETDEV_FEAT_CHANGE 0x000B 2318 #define NETDEV_BONDING_FAILOVER 0x000C 2319 #define NETDEV_PRE_UP 0x000D 2320 #define NETDEV_PRE_TYPE_CHANGE 0x000E 2321 #define NETDEV_POST_TYPE_CHANGE 0x000F 2322 #define NETDEV_POST_INIT 0x0010 2323 #define NETDEV_UNREGISTER_FINAL 0x0011 2324 #define NETDEV_RELEASE 0x0012 2325 #define NETDEV_NOTIFY_PEERS 0x0013 2326 #define NETDEV_JOIN 0x0014 2327 #define NETDEV_CHANGEUPPER 0x0015 2328 #define NETDEV_RESEND_IGMP 0x0016 2329 #define NETDEV_PRECHANGEMTU 0x0017 /* notify before mtu change happened */ 2330 #define NETDEV_CHANGEINFODATA 0x0018 2331 #define NETDEV_BONDING_INFO 0x0019 2332 #define NETDEV_PRECHANGEUPPER 0x001A 2333 #define NETDEV_CHANGELOWERSTATE 0x001B 2334 #define NETDEV_UDP_TUNNEL_PUSH_INFO 0x001C 2335 #define NETDEV_UDP_TUNNEL_DROP_INFO 0x001D 2336 #define NETDEV_CHANGE_TX_QUEUE_LEN 0x001E 2337 2338 int register_netdevice_notifier(struct notifier_block *nb); 2339 int unregister_netdevice_notifier(struct notifier_block *nb); 2340 2341 struct netdev_notifier_info { 2342 struct net_device *dev; 2343 struct netlink_ext_ack *extack; 2344 }; 2345 2346 struct netdev_notifier_change_info { 2347 struct netdev_notifier_info info; /* must be first */ 2348 unsigned int flags_changed; 2349 }; 2350 2351 struct netdev_notifier_changeupper_info { 2352 struct netdev_notifier_info info; /* must be first */ 2353 struct net_device *upper_dev; /* new upper dev */ 2354 bool master; /* is upper dev master */ 2355 bool linking; /* is the notification for link or unlink */ 2356 void *upper_info; /* upper dev info */ 2357 }; 2358 2359 struct netdev_notifier_changelowerstate_info { 2360 struct netdev_notifier_info info; /* must be first */ 2361 void *lower_state_info; /* is lower dev state */ 2362 }; 2363 2364 static inline void netdev_notifier_info_init(struct netdev_notifier_info *info, 2365 struct net_device *dev) 2366 { 2367 info->dev = dev; 2368 info->extack = NULL; 2369 } 2370 2371 static inline struct net_device * 2372 netdev_notifier_info_to_dev(const struct netdev_notifier_info *info) 2373 { 2374 return info->dev; 2375 } 2376 2377 static inline struct netlink_ext_ack * 2378 netdev_notifier_info_to_extack(const struct netdev_notifier_info *info) 2379 { 2380 return info->extack; 2381 } 2382 2383 int call_netdevice_notifiers(unsigned long val, struct net_device *dev); 2384 2385 2386 extern rwlock_t dev_base_lock; /* Device list lock */ 2387 2388 #define for_each_netdev(net, d) \ 2389 list_for_each_entry(d, &(net)->dev_base_head, dev_list) 2390 #define for_each_netdev_reverse(net, d) \ 2391 list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list) 2392 #define for_each_netdev_rcu(net, d) \ 2393 list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list) 2394 #define for_each_netdev_safe(net, d, n) \ 2395 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list) 2396 #define for_each_netdev_continue(net, d) \ 2397 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list) 2398 #define for_each_netdev_continue_rcu(net, d) \ 2399 list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list) 2400 #define for_each_netdev_in_bond_rcu(bond, slave) \ 2401 for_each_netdev_rcu(&init_net, slave) \ 2402 if (netdev_master_upper_dev_get_rcu(slave) == (bond)) 2403 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) 2404 2405 static inline struct net_device *next_net_device(struct net_device *dev) 2406 { 2407 struct list_head *lh; 2408 struct net *net; 2409 2410 net = dev_net(dev); 2411 lh = dev->dev_list.next; 2412 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 2413 } 2414 2415 static inline struct net_device *next_net_device_rcu(struct net_device *dev) 2416 { 2417 struct list_head *lh; 2418 struct net *net; 2419 2420 net = dev_net(dev); 2421 lh = rcu_dereference(list_next_rcu(&dev->dev_list)); 2422 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 2423 } 2424 2425 static inline struct net_device *first_net_device(struct net *net) 2426 { 2427 return list_empty(&net->dev_base_head) ? NULL : 2428 net_device_entry(net->dev_base_head.next); 2429 } 2430 2431 static inline struct net_device *first_net_device_rcu(struct net *net) 2432 { 2433 struct list_head *lh = rcu_dereference(list_next_rcu(&net->dev_base_head)); 2434 2435 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 2436 } 2437 2438 int netdev_boot_setup_check(struct net_device *dev); 2439 unsigned long netdev_boot_base(const char *prefix, int unit); 2440 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, 2441 const char *hwaddr); 2442 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type); 2443 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type); 2444 void dev_add_pack(struct packet_type *pt); 2445 void dev_remove_pack(struct packet_type *pt); 2446 void __dev_remove_pack(struct packet_type *pt); 2447 void dev_add_offload(struct packet_offload *po); 2448 void dev_remove_offload(struct packet_offload *po); 2449 2450 int dev_get_iflink(const struct net_device *dev); 2451 int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb); 2452 struct net_device *__dev_get_by_flags(struct net *net, unsigned short flags, 2453 unsigned short mask); 2454 struct net_device *dev_get_by_name(struct net *net, const char *name); 2455 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name); 2456 struct net_device *__dev_get_by_name(struct net *net, const char *name); 2457 int dev_alloc_name(struct net_device *dev, const char *name); 2458 int dev_open(struct net_device *dev); 2459 void dev_close(struct net_device *dev); 2460 void dev_close_many(struct list_head *head, bool unlink); 2461 void dev_disable_lro(struct net_device *dev); 2462 int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *newskb); 2463 int dev_queue_xmit(struct sk_buff *skb); 2464 int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv); 2465 int register_netdevice(struct net_device *dev); 2466 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head); 2467 void unregister_netdevice_many(struct list_head *head); 2468 static inline void unregister_netdevice(struct net_device *dev) 2469 { 2470 unregister_netdevice_queue(dev, NULL); 2471 } 2472 2473 int netdev_refcnt_read(const struct net_device *dev); 2474 void free_netdev(struct net_device *dev); 2475 void netdev_freemem(struct net_device *dev); 2476 void synchronize_net(void); 2477 int init_dummy_netdev(struct net_device *dev); 2478 2479 DECLARE_PER_CPU(int, xmit_recursion); 2480 #define XMIT_RECURSION_LIMIT 10 2481 2482 static inline int dev_recursion_level(void) 2483 { 2484 return this_cpu_read(xmit_recursion); 2485 } 2486 2487 struct net_device *dev_get_by_index(struct net *net, int ifindex); 2488 struct net_device *__dev_get_by_index(struct net *net, int ifindex); 2489 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex); 2490 struct net_device *dev_get_by_napi_id(unsigned int napi_id); 2491 int netdev_get_name(struct net *net, char *name, int ifindex); 2492 int dev_restart(struct net_device *dev); 2493 int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb); 2494 2495 static inline unsigned int skb_gro_offset(const struct sk_buff *skb) 2496 { 2497 return NAPI_GRO_CB(skb)->data_offset; 2498 } 2499 2500 static inline unsigned int skb_gro_len(const struct sk_buff *skb) 2501 { 2502 return skb->len - NAPI_GRO_CB(skb)->data_offset; 2503 } 2504 2505 static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len) 2506 { 2507 NAPI_GRO_CB(skb)->data_offset += len; 2508 } 2509 2510 static inline void *skb_gro_header_fast(struct sk_buff *skb, 2511 unsigned int offset) 2512 { 2513 return NAPI_GRO_CB(skb)->frag0 + offset; 2514 } 2515 2516 static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen) 2517 { 2518 return NAPI_GRO_CB(skb)->frag0_len < hlen; 2519 } 2520 2521 static inline void skb_gro_frag0_invalidate(struct sk_buff *skb) 2522 { 2523 NAPI_GRO_CB(skb)->frag0 = NULL; 2524 NAPI_GRO_CB(skb)->frag0_len = 0; 2525 } 2526 2527 static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen, 2528 unsigned int offset) 2529 { 2530 if (!pskb_may_pull(skb, hlen)) 2531 return NULL; 2532 2533 skb_gro_frag0_invalidate(skb); 2534 return skb->data + offset; 2535 } 2536 2537 static inline void *skb_gro_network_header(struct sk_buff *skb) 2538 { 2539 return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) + 2540 skb_network_offset(skb); 2541 } 2542 2543 static inline void skb_gro_postpull_rcsum(struct sk_buff *skb, 2544 const void *start, unsigned int len) 2545 { 2546 if (NAPI_GRO_CB(skb)->csum_valid) 2547 NAPI_GRO_CB(skb)->csum = csum_sub(NAPI_GRO_CB(skb)->csum, 2548 csum_partial(start, len, 0)); 2549 } 2550 2551 /* GRO checksum functions. These are logical equivalents of the normal 2552 * checksum functions (in skbuff.h) except that they operate on the GRO 2553 * offsets and fields in sk_buff. 2554 */ 2555 2556 __sum16 __skb_gro_checksum_complete(struct sk_buff *skb); 2557 2558 static inline bool skb_at_gro_remcsum_start(struct sk_buff *skb) 2559 { 2560 return (NAPI_GRO_CB(skb)->gro_remcsum_start == skb_gro_offset(skb)); 2561 } 2562 2563 static inline bool __skb_gro_checksum_validate_needed(struct sk_buff *skb, 2564 bool zero_okay, 2565 __sum16 check) 2566 { 2567 return ((skb->ip_summed != CHECKSUM_PARTIAL || 2568 skb_checksum_start_offset(skb) < 2569 skb_gro_offset(skb)) && 2570 !skb_at_gro_remcsum_start(skb) && 2571 NAPI_GRO_CB(skb)->csum_cnt == 0 && 2572 (!zero_okay || check)); 2573 } 2574 2575 static inline __sum16 __skb_gro_checksum_validate_complete(struct sk_buff *skb, 2576 __wsum psum) 2577 { 2578 if (NAPI_GRO_CB(skb)->csum_valid && 2579 !csum_fold(csum_add(psum, NAPI_GRO_CB(skb)->csum))) 2580 return 0; 2581 2582 NAPI_GRO_CB(skb)->csum = psum; 2583 2584 return __skb_gro_checksum_complete(skb); 2585 } 2586 2587 static inline void skb_gro_incr_csum_unnecessary(struct sk_buff *skb) 2588 { 2589 if (NAPI_GRO_CB(skb)->csum_cnt > 0) { 2590 /* Consume a checksum from CHECKSUM_UNNECESSARY */ 2591 NAPI_GRO_CB(skb)->csum_cnt--; 2592 } else { 2593 /* Update skb for CHECKSUM_UNNECESSARY and csum_level when we 2594 * verified a new top level checksum or an encapsulated one 2595 * during GRO. This saves work if we fallback to normal path. 2596 */ 2597 __skb_incr_checksum_unnecessary(skb); 2598 } 2599 } 2600 2601 #define __skb_gro_checksum_validate(skb, proto, zero_okay, check, \ 2602 compute_pseudo) \ 2603 ({ \ 2604 __sum16 __ret = 0; \ 2605 if (__skb_gro_checksum_validate_needed(skb, zero_okay, check)) \ 2606 __ret = __skb_gro_checksum_validate_complete(skb, \ 2607 compute_pseudo(skb, proto)); \ 2608 if (!__ret) \ 2609 skb_gro_incr_csum_unnecessary(skb); \ 2610 __ret; \ 2611 }) 2612 2613 #define skb_gro_checksum_validate(skb, proto, compute_pseudo) \ 2614 __skb_gro_checksum_validate(skb, proto, false, 0, compute_pseudo) 2615 2616 #define skb_gro_checksum_validate_zero_check(skb, proto, check, \ 2617 compute_pseudo) \ 2618 __skb_gro_checksum_validate(skb, proto, true, check, compute_pseudo) 2619 2620 #define skb_gro_checksum_simple_validate(skb) \ 2621 __skb_gro_checksum_validate(skb, 0, false, 0, null_compute_pseudo) 2622 2623 static inline bool __skb_gro_checksum_convert_check(struct sk_buff *skb) 2624 { 2625 return (NAPI_GRO_CB(skb)->csum_cnt == 0 && 2626 !NAPI_GRO_CB(skb)->csum_valid); 2627 } 2628 2629 static inline void __skb_gro_checksum_convert(struct sk_buff *skb, 2630 __sum16 check, __wsum pseudo) 2631 { 2632 NAPI_GRO_CB(skb)->csum = ~pseudo; 2633 NAPI_GRO_CB(skb)->csum_valid = 1; 2634 } 2635 2636 #define skb_gro_checksum_try_convert(skb, proto, check, compute_pseudo) \ 2637 do { \ 2638 if (__skb_gro_checksum_convert_check(skb)) \ 2639 __skb_gro_checksum_convert(skb, check, \ 2640 compute_pseudo(skb, proto)); \ 2641 } while (0) 2642 2643 struct gro_remcsum { 2644 int offset; 2645 __wsum delta; 2646 }; 2647 2648 static inline void skb_gro_remcsum_init(struct gro_remcsum *grc) 2649 { 2650 grc->offset = 0; 2651 grc->delta = 0; 2652 } 2653 2654 static inline void *skb_gro_remcsum_process(struct sk_buff *skb, void *ptr, 2655 unsigned int off, size_t hdrlen, 2656 int start, int offset, 2657 struct gro_remcsum *grc, 2658 bool nopartial) 2659 { 2660 __wsum delta; 2661 size_t plen = hdrlen + max_t(size_t, offset + sizeof(u16), start); 2662 2663 BUG_ON(!NAPI_GRO_CB(skb)->csum_valid); 2664 2665 if (!nopartial) { 2666 NAPI_GRO_CB(skb)->gro_remcsum_start = off + hdrlen + start; 2667 return ptr; 2668 } 2669 2670 ptr = skb_gro_header_fast(skb, off); 2671 if (skb_gro_header_hard(skb, off + plen)) { 2672 ptr = skb_gro_header_slow(skb, off + plen, off); 2673 if (!ptr) 2674 return NULL; 2675 } 2676 2677 delta = remcsum_adjust(ptr + hdrlen, NAPI_GRO_CB(skb)->csum, 2678 start, offset); 2679 2680 /* Adjust skb->csum since we changed the packet */ 2681 NAPI_GRO_CB(skb)->csum = csum_add(NAPI_GRO_CB(skb)->csum, delta); 2682 2683 grc->offset = off + hdrlen + offset; 2684 grc->delta = delta; 2685 2686 return ptr; 2687 } 2688 2689 static inline void skb_gro_remcsum_cleanup(struct sk_buff *skb, 2690 struct gro_remcsum *grc) 2691 { 2692 void *ptr; 2693 size_t plen = grc->offset + sizeof(u16); 2694 2695 if (!grc->delta) 2696 return; 2697 2698 ptr = skb_gro_header_fast(skb, grc->offset); 2699 if (skb_gro_header_hard(skb, grc->offset + sizeof(u16))) { 2700 ptr = skb_gro_header_slow(skb, plen, grc->offset); 2701 if (!ptr) 2702 return; 2703 } 2704 2705 remcsum_unadjust((__sum16 *)ptr, grc->delta); 2706 } 2707 2708 #ifdef CONFIG_XFRM_OFFLOAD 2709 static inline void skb_gro_flush_final(struct sk_buff *skb, struct sk_buff **pp, int flush) 2710 { 2711 if (PTR_ERR(pp) != -EINPROGRESS) 2712 NAPI_GRO_CB(skb)->flush |= flush; 2713 } 2714 #else 2715 static inline void skb_gro_flush_final(struct sk_buff *skb, struct sk_buff **pp, int flush) 2716 { 2717 NAPI_GRO_CB(skb)->flush |= flush; 2718 } 2719 #endif 2720 2721 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, 2722 unsigned short type, 2723 const void *daddr, const void *saddr, 2724 unsigned int len) 2725 { 2726 if (!dev->header_ops || !dev->header_ops->create) 2727 return 0; 2728 2729 return dev->header_ops->create(skb, dev, type, daddr, saddr, len); 2730 } 2731 2732 static inline int dev_parse_header(const struct sk_buff *skb, 2733 unsigned char *haddr) 2734 { 2735 const struct net_device *dev = skb->dev; 2736 2737 if (!dev->header_ops || !dev->header_ops->parse) 2738 return 0; 2739 return dev->header_ops->parse(skb, haddr); 2740 } 2741 2742 /* ll_header must have at least hard_header_len allocated */ 2743 static inline bool dev_validate_header(const struct net_device *dev, 2744 char *ll_header, int len) 2745 { 2746 if (likely(len >= dev->hard_header_len)) 2747 return true; 2748 if (len < dev->min_header_len) 2749 return false; 2750 2751 if (capable(CAP_SYS_RAWIO)) { 2752 memset(ll_header + len, 0, dev->hard_header_len - len); 2753 return true; 2754 } 2755 2756 if (dev->header_ops && dev->header_ops->validate) 2757 return dev->header_ops->validate(ll_header, len); 2758 2759 return false; 2760 } 2761 2762 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 2763 int register_gifconf(unsigned int family, gifconf_func_t *gifconf); 2764 static inline int unregister_gifconf(unsigned int family) 2765 { 2766 return register_gifconf(family, NULL); 2767 } 2768 2769 #ifdef CONFIG_NET_FLOW_LIMIT 2770 #define FLOW_LIMIT_HISTORY (1 << 7) /* must be ^2 and !overflow buckets */ 2771 struct sd_flow_limit { 2772 u64 count; 2773 unsigned int num_buckets; 2774 unsigned int history_head; 2775 u16 history[FLOW_LIMIT_HISTORY]; 2776 u8 buckets[]; 2777 }; 2778 2779 extern int netdev_flow_limit_table_len; 2780 #endif /* CONFIG_NET_FLOW_LIMIT */ 2781 2782 /* 2783 * Incoming packets are placed on per-CPU queues 2784 */ 2785 struct softnet_data { 2786 struct list_head poll_list; 2787 struct sk_buff_head process_queue; 2788 2789 /* stats */ 2790 unsigned int processed; 2791 unsigned int time_squeeze; 2792 unsigned int received_rps; 2793 #ifdef CONFIG_RPS 2794 struct softnet_data *rps_ipi_list; 2795 #endif 2796 #ifdef CONFIG_NET_FLOW_LIMIT 2797 struct sd_flow_limit __rcu *flow_limit; 2798 #endif 2799 struct Qdisc *output_queue; 2800 struct Qdisc **output_queue_tailp; 2801 struct sk_buff *completion_queue; 2802 #ifdef CONFIG_XFRM_OFFLOAD 2803 struct sk_buff_head xfrm_backlog; 2804 #endif 2805 #ifdef CONFIG_RPS 2806 /* input_queue_head should be written by cpu owning this struct, 2807 * and only read by other cpus. Worth using a cache line. 2808 */ 2809 unsigned int input_queue_head ____cacheline_aligned_in_smp; 2810 2811 /* Elements below can be accessed between CPUs for RPS/RFS */ 2812 call_single_data_t csd ____cacheline_aligned_in_smp; 2813 struct softnet_data *rps_ipi_next; 2814 unsigned int cpu; 2815 unsigned int input_queue_tail; 2816 #endif 2817 unsigned int dropped; 2818 struct sk_buff_head input_pkt_queue; 2819 struct napi_struct backlog; 2820 2821 }; 2822 2823 static inline void input_queue_head_incr(struct softnet_data *sd) 2824 { 2825 #ifdef CONFIG_RPS 2826 sd->input_queue_head++; 2827 #endif 2828 } 2829 2830 static inline void input_queue_tail_incr_save(struct softnet_data *sd, 2831 unsigned int *qtail) 2832 { 2833 #ifdef CONFIG_RPS 2834 *qtail = ++sd->input_queue_tail; 2835 #endif 2836 } 2837 2838 DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); 2839 2840 void __netif_schedule(struct Qdisc *q); 2841 void netif_schedule_queue(struct netdev_queue *txq); 2842 2843 static inline void netif_tx_schedule_all(struct net_device *dev) 2844 { 2845 unsigned int i; 2846 2847 for (i = 0; i < dev->num_tx_queues; i++) 2848 netif_schedule_queue(netdev_get_tx_queue(dev, i)); 2849 } 2850 2851 static __always_inline void netif_tx_start_queue(struct netdev_queue *dev_queue) 2852 { 2853 clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state); 2854 } 2855 2856 /** 2857 * netif_start_queue - allow transmit 2858 * @dev: network device 2859 * 2860 * Allow upper layers to call the device hard_start_xmit routine. 2861 */ 2862 static inline void netif_start_queue(struct net_device *dev) 2863 { 2864 netif_tx_start_queue(netdev_get_tx_queue(dev, 0)); 2865 } 2866 2867 static inline void netif_tx_start_all_queues(struct net_device *dev) 2868 { 2869 unsigned int i; 2870 2871 for (i = 0; i < dev->num_tx_queues; i++) { 2872 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 2873 netif_tx_start_queue(txq); 2874 } 2875 } 2876 2877 void netif_tx_wake_queue(struct netdev_queue *dev_queue); 2878 2879 /** 2880 * netif_wake_queue - restart transmit 2881 * @dev: network device 2882 * 2883 * Allow upper layers to call the device hard_start_xmit routine. 2884 * Used for flow control when transmit resources are available. 2885 */ 2886 static inline void netif_wake_queue(struct net_device *dev) 2887 { 2888 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0)); 2889 } 2890 2891 static inline void netif_tx_wake_all_queues(struct net_device *dev) 2892 { 2893 unsigned int i; 2894 2895 for (i = 0; i < dev->num_tx_queues; i++) { 2896 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 2897 netif_tx_wake_queue(txq); 2898 } 2899 } 2900 2901 static __always_inline void netif_tx_stop_queue(struct netdev_queue *dev_queue) 2902 { 2903 set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state); 2904 } 2905 2906 /** 2907 * netif_stop_queue - stop transmitted packets 2908 * @dev: network device 2909 * 2910 * Stop upper layers calling the device hard_start_xmit routine. 2911 * Used for flow control when transmit resources are unavailable. 2912 */ 2913 static inline void netif_stop_queue(struct net_device *dev) 2914 { 2915 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0)); 2916 } 2917 2918 void netif_tx_stop_all_queues(struct net_device *dev); 2919 2920 static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue) 2921 { 2922 return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state); 2923 } 2924 2925 /** 2926 * netif_queue_stopped - test if transmit queue is flowblocked 2927 * @dev: network device 2928 * 2929 * Test if transmit queue on device is currently unable to send. 2930 */ 2931 static inline bool netif_queue_stopped(const struct net_device *dev) 2932 { 2933 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0)); 2934 } 2935 2936 static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue) 2937 { 2938 return dev_queue->state & QUEUE_STATE_ANY_XOFF; 2939 } 2940 2941 static inline bool 2942 netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue) 2943 { 2944 return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN; 2945 } 2946 2947 static inline bool 2948 netif_xmit_frozen_or_drv_stopped(const struct netdev_queue *dev_queue) 2949 { 2950 return dev_queue->state & QUEUE_STATE_DRV_XOFF_OR_FROZEN; 2951 } 2952 2953 /** 2954 * netdev_txq_bql_enqueue_prefetchw - prefetch bql data for write 2955 * @dev_queue: pointer to transmit queue 2956 * 2957 * BQL enabled drivers might use this helper in their ndo_start_xmit(), 2958 * to give appropriate hint to the CPU. 2959 */ 2960 static inline void netdev_txq_bql_enqueue_prefetchw(struct netdev_queue *dev_queue) 2961 { 2962 #ifdef CONFIG_BQL 2963 prefetchw(&dev_queue->dql.num_queued); 2964 #endif 2965 } 2966 2967 /** 2968 * netdev_txq_bql_complete_prefetchw - prefetch bql data for write 2969 * @dev_queue: pointer to transmit queue 2970 * 2971 * BQL enabled drivers might use this helper in their TX completion path, 2972 * to give appropriate hint to the CPU. 2973 */ 2974 static inline void netdev_txq_bql_complete_prefetchw(struct netdev_queue *dev_queue) 2975 { 2976 #ifdef CONFIG_BQL 2977 prefetchw(&dev_queue->dql.limit); 2978 #endif 2979 } 2980 2981 static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue, 2982 unsigned int bytes) 2983 { 2984 #ifdef CONFIG_BQL 2985 dql_queued(&dev_queue->dql, bytes); 2986 2987 if (likely(dql_avail(&dev_queue->dql) >= 0)) 2988 return; 2989 2990 set_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state); 2991 2992 /* 2993 * The XOFF flag must be set before checking the dql_avail below, 2994 * because in netdev_tx_completed_queue we update the dql_completed 2995 * before checking the XOFF flag. 2996 */ 2997 smp_mb(); 2998 2999 /* check again in case another CPU has just made room avail */ 3000 if (unlikely(dql_avail(&dev_queue->dql) >= 0)) 3001 clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state); 3002 #endif 3003 } 3004 3005 /** 3006 * netdev_sent_queue - report the number of bytes queued to hardware 3007 * @dev: network device 3008 * @bytes: number of bytes queued to the hardware device queue 3009 * 3010 * Report the number of bytes queued for sending/completion to the network 3011 * device hardware queue. @bytes should be a good approximation and should 3012 * exactly match netdev_completed_queue() @bytes 3013 */ 3014 static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes) 3015 { 3016 netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes); 3017 } 3018 3019 static inline void netdev_tx_completed_queue(struct netdev_queue *dev_queue, 3020 unsigned int pkts, unsigned int bytes) 3021 { 3022 #ifdef CONFIG_BQL 3023 if (unlikely(!bytes)) 3024 return; 3025 3026 dql_completed(&dev_queue->dql, bytes); 3027 3028 /* 3029 * Without the memory barrier there is a small possiblity that 3030 * netdev_tx_sent_queue will miss the update and cause the queue to 3031 * be stopped forever 3032 */ 3033 smp_mb(); 3034 3035 if (dql_avail(&dev_queue->dql) < 0) 3036 return; 3037 3038 if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state)) 3039 netif_schedule_queue(dev_queue); 3040 #endif 3041 } 3042 3043 /** 3044 * netdev_completed_queue - report bytes and packets completed by device 3045 * @dev: network device 3046 * @pkts: actual number of packets sent over the medium 3047 * @bytes: actual number of bytes sent over the medium 3048 * 3049 * Report the number of bytes and packets transmitted by the network device 3050 * hardware queue over the physical medium, @bytes must exactly match the 3051 * @bytes amount passed to netdev_sent_queue() 3052 */ 3053 static inline void netdev_completed_queue(struct net_device *dev, 3054 unsigned int pkts, unsigned int bytes) 3055 { 3056 netdev_tx_completed_queue(netdev_get_tx_queue(dev, 0), pkts, bytes); 3057 } 3058 3059 static inline void netdev_tx_reset_queue(struct netdev_queue *q) 3060 { 3061 #ifdef CONFIG_BQL 3062 clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state); 3063 dql_reset(&q->dql); 3064 #endif 3065 } 3066 3067 /** 3068 * netdev_reset_queue - reset the packets and bytes count of a network device 3069 * @dev_queue: network device 3070 * 3071 * Reset the bytes and packet count of a network device and clear the 3072 * software flow control OFF bit for this network device 3073 */ 3074 static inline void netdev_reset_queue(struct net_device *dev_queue) 3075 { 3076 netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0)); 3077 } 3078 3079 /** 3080 * netdev_cap_txqueue - check if selected tx queue exceeds device queues 3081 * @dev: network device 3082 * @queue_index: given tx queue index 3083 * 3084 * Returns 0 if given tx queue index >= number of device tx queues, 3085 * otherwise returns the originally passed tx queue index. 3086 */ 3087 static inline u16 netdev_cap_txqueue(struct net_device *dev, u16 queue_index) 3088 { 3089 if (unlikely(queue_index >= dev->real_num_tx_queues)) { 3090 net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n", 3091 dev->name, queue_index, 3092 dev->real_num_tx_queues); 3093 return 0; 3094 } 3095 3096 return queue_index; 3097 } 3098 3099 /** 3100 * netif_running - test if up 3101 * @dev: network device 3102 * 3103 * Test if the device has been brought up. 3104 */ 3105 static inline bool netif_running(const struct net_device *dev) 3106 { 3107 return test_bit(__LINK_STATE_START, &dev->state); 3108 } 3109 3110 /* 3111 * Routines to manage the subqueues on a device. We only need start, 3112 * stop, and a check if it's stopped. All other device management is 3113 * done at the overall netdevice level. 3114 * Also test the device if we're multiqueue. 3115 */ 3116 3117 /** 3118 * netif_start_subqueue - allow sending packets on subqueue 3119 * @dev: network device 3120 * @queue_index: sub queue index 3121 * 3122 * Start individual transmit queue of a device with multiple transmit queues. 3123 */ 3124 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 3125 { 3126 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 3127 3128 netif_tx_start_queue(txq); 3129 } 3130 3131 /** 3132 * netif_stop_subqueue - stop sending packets on subqueue 3133 * @dev: network device 3134 * @queue_index: sub queue index 3135 * 3136 * Stop individual transmit queue of a device with multiple transmit queues. 3137 */ 3138 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 3139 { 3140 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 3141 netif_tx_stop_queue(txq); 3142 } 3143 3144 /** 3145 * netif_subqueue_stopped - test status of subqueue 3146 * @dev: network device 3147 * @queue_index: sub queue index 3148 * 3149 * Check individual transmit queue of a device with multiple transmit queues. 3150 */ 3151 static inline bool __netif_subqueue_stopped(const struct net_device *dev, 3152 u16 queue_index) 3153 { 3154 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 3155 3156 return netif_tx_queue_stopped(txq); 3157 } 3158 3159 static inline bool netif_subqueue_stopped(const struct net_device *dev, 3160 struct sk_buff *skb) 3161 { 3162 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb)); 3163 } 3164 3165 /** 3166 * netif_wake_subqueue - allow sending packets on subqueue 3167 * @dev: network device 3168 * @queue_index: sub queue index 3169 * 3170 * Resume individual transmit queue of a device with multiple transmit queues. 3171 */ 3172 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 3173 { 3174 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 3175 3176 netif_tx_wake_queue(txq); 3177 } 3178 3179 #ifdef CONFIG_XPS 3180 int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask, 3181 u16 index); 3182 #else 3183 static inline int netif_set_xps_queue(struct net_device *dev, 3184 const struct cpumask *mask, 3185 u16 index) 3186 { 3187 return 0; 3188 } 3189 #endif 3190 3191 u16 __skb_tx_hash(const struct net_device *dev, struct sk_buff *skb, 3192 unsigned int num_tx_queues); 3193 3194 /* 3195 * Returns a Tx hash for the given packet when dev->real_num_tx_queues is used 3196 * as a distribution range limit for the returned value. 3197 */ 3198 static inline u16 skb_tx_hash(const struct net_device *dev, 3199 struct sk_buff *skb) 3200 { 3201 return __skb_tx_hash(dev, skb, dev->real_num_tx_queues); 3202 } 3203 3204 /** 3205 * netif_is_multiqueue - test if device has multiple transmit queues 3206 * @dev: network device 3207 * 3208 * Check if device has multiple transmit queues 3209 */ 3210 static inline bool netif_is_multiqueue(const struct net_device *dev) 3211 { 3212 return dev->num_tx_queues > 1; 3213 } 3214 3215 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq); 3216 3217 #ifdef CONFIG_SYSFS 3218 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq); 3219 #else 3220 static inline int netif_set_real_num_rx_queues(struct net_device *dev, 3221 unsigned int rxq) 3222 { 3223 return 0; 3224 } 3225 #endif 3226 3227 #ifdef CONFIG_SYSFS 3228 static inline unsigned int get_netdev_rx_queue_index( 3229 struct netdev_rx_queue *queue) 3230 { 3231 struct net_device *dev = queue->dev; 3232 int index = queue - dev->_rx; 3233 3234 BUG_ON(index >= dev->num_rx_queues); 3235 return index; 3236 } 3237 #endif 3238 3239 #define DEFAULT_MAX_NUM_RSS_QUEUES (8) 3240 int netif_get_num_default_rss_queues(void); 3241 3242 enum skb_free_reason { 3243 SKB_REASON_CONSUMED, 3244 SKB_REASON_DROPPED, 3245 }; 3246 3247 void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason); 3248 void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason); 3249 3250 /* 3251 * It is not allowed to call kfree_skb() or consume_skb() from hardware 3252 * interrupt context or with hardware interrupts being disabled. 3253 * (in_irq() || irqs_disabled()) 3254 * 3255 * We provide four helpers that can be used in following contexts : 3256 * 3257 * dev_kfree_skb_irq(skb) when caller drops a packet from irq context, 3258 * replacing kfree_skb(skb) 3259 * 3260 * dev_consume_skb_irq(skb) when caller consumes a packet from irq context. 3261 * Typically used in place of consume_skb(skb) in TX completion path 3262 * 3263 * dev_kfree_skb_any(skb) when caller doesn't know its current irq context, 3264 * replacing kfree_skb(skb) 3265 * 3266 * dev_consume_skb_any(skb) when caller doesn't know its current irq context, 3267 * and consumed a packet. Used in place of consume_skb(skb) 3268 */ 3269 static inline void dev_kfree_skb_irq(struct sk_buff *skb) 3270 { 3271 __dev_kfree_skb_irq(skb, SKB_REASON_DROPPED); 3272 } 3273 3274 static inline void dev_consume_skb_irq(struct sk_buff *skb) 3275 { 3276 __dev_kfree_skb_irq(skb, SKB_REASON_CONSUMED); 3277 } 3278 3279 static inline void dev_kfree_skb_any(struct sk_buff *skb) 3280 { 3281 __dev_kfree_skb_any(skb, SKB_REASON_DROPPED); 3282 } 3283 3284 static inline void dev_consume_skb_any(struct sk_buff *skb) 3285 { 3286 __dev_kfree_skb_any(skb, SKB_REASON_CONSUMED); 3287 } 3288 3289 void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog); 3290 int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb); 3291 int netif_rx(struct sk_buff *skb); 3292 int netif_rx_ni(struct sk_buff *skb); 3293 int netif_receive_skb(struct sk_buff *skb); 3294 int netif_receive_skb_core(struct sk_buff *skb); 3295 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb); 3296 void napi_gro_flush(struct napi_struct *napi, bool flush_old); 3297 struct sk_buff *napi_get_frags(struct napi_struct *napi); 3298 gro_result_t napi_gro_frags(struct napi_struct *napi); 3299 struct packet_offload *gro_find_receive_by_type(__be16 type); 3300 struct packet_offload *gro_find_complete_by_type(__be16 type); 3301 3302 static inline void napi_free_frags(struct napi_struct *napi) 3303 { 3304 kfree_skb(napi->skb); 3305 napi->skb = NULL; 3306 } 3307 3308 bool netdev_is_rx_handler_busy(struct net_device *dev); 3309 int netdev_rx_handler_register(struct net_device *dev, 3310 rx_handler_func_t *rx_handler, 3311 void *rx_handler_data); 3312 void netdev_rx_handler_unregister(struct net_device *dev); 3313 3314 bool dev_valid_name(const char *name); 3315 int dev_ioctl(struct net *net, unsigned int cmd, void __user *); 3316 int dev_ethtool(struct net *net, struct ifreq *); 3317 unsigned int dev_get_flags(const struct net_device *); 3318 int __dev_change_flags(struct net_device *, unsigned int flags); 3319 int dev_change_flags(struct net_device *, unsigned int); 3320 void __dev_notify_flags(struct net_device *, unsigned int old_flags, 3321 unsigned int gchanges); 3322 int dev_change_name(struct net_device *, const char *); 3323 int dev_set_alias(struct net_device *, const char *, size_t); 3324 int dev_get_alias(const struct net_device *, char *, size_t); 3325 int dev_change_net_namespace(struct net_device *, struct net *, const char *); 3326 int __dev_set_mtu(struct net_device *, int); 3327 int dev_set_mtu(struct net_device *, int); 3328 void dev_set_group(struct net_device *, int); 3329 int dev_set_mac_address(struct net_device *, struct sockaddr *); 3330 int dev_change_carrier(struct net_device *, bool new_carrier); 3331 int dev_get_phys_port_id(struct net_device *dev, 3332 struct netdev_phys_item_id *ppid); 3333 int dev_get_phys_port_name(struct net_device *dev, 3334 char *name, size_t len); 3335 int dev_change_proto_down(struct net_device *dev, bool proto_down); 3336 struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again); 3337 struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, 3338 struct netdev_queue *txq, int *ret); 3339 3340 typedef int (*bpf_op_t)(struct net_device *dev, struct netdev_bpf *bpf); 3341 int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack, 3342 int fd, u32 flags); 3343 void __dev_xdp_query(struct net_device *dev, bpf_op_t xdp_op, 3344 struct netdev_bpf *xdp); 3345 3346 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb); 3347 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb); 3348 bool is_skb_forwardable(const struct net_device *dev, 3349 const struct sk_buff *skb); 3350 3351 static __always_inline int ____dev_forward_skb(struct net_device *dev, 3352 struct sk_buff *skb) 3353 { 3354 if (skb_orphan_frags(skb, GFP_ATOMIC) || 3355 unlikely(!is_skb_forwardable(dev, skb))) { 3356 atomic_long_inc(&dev->rx_dropped); 3357 kfree_skb(skb); 3358 return NET_RX_DROP; 3359 } 3360 3361 skb_scrub_packet(skb, true); 3362 skb->priority = 0; 3363 return 0; 3364 } 3365 3366 void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev); 3367 3368 extern int netdev_budget; 3369 extern unsigned int netdev_budget_usecs; 3370 3371 /* Called by rtnetlink.c:rtnl_unlock() */ 3372 void netdev_run_todo(void); 3373 3374 /** 3375 * dev_put - release reference to device 3376 * @dev: network device 3377 * 3378 * Release reference to device to allow it to be freed. 3379 */ 3380 static inline void dev_put(struct net_device *dev) 3381 { 3382 this_cpu_dec(*dev->pcpu_refcnt); 3383 } 3384 3385 /** 3386 * dev_hold - get reference to device 3387 * @dev: network device 3388 * 3389 * Hold reference to device to keep it from being freed. 3390 */ 3391 static inline void dev_hold(struct net_device *dev) 3392 { 3393 this_cpu_inc(*dev->pcpu_refcnt); 3394 } 3395 3396 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 3397 * and _off may be called from IRQ context, but it is caller 3398 * who is responsible for serialization of these calls. 3399 * 3400 * The name carrier is inappropriate, these functions should really be 3401 * called netif_lowerlayer_*() because they represent the state of any 3402 * kind of lower layer not just hardware media. 3403 */ 3404 3405 void linkwatch_init_dev(struct net_device *dev); 3406 void linkwatch_fire_event(struct net_device *dev); 3407 void linkwatch_forget_dev(struct net_device *dev); 3408 3409 /** 3410 * netif_carrier_ok - test if carrier present 3411 * @dev: network device 3412 * 3413 * Check if carrier is present on device 3414 */ 3415 static inline bool netif_carrier_ok(const struct net_device *dev) 3416 { 3417 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 3418 } 3419 3420 unsigned long dev_trans_start(struct net_device *dev); 3421 3422 void __netdev_watchdog_up(struct net_device *dev); 3423 3424 void netif_carrier_on(struct net_device *dev); 3425 3426 void netif_carrier_off(struct net_device *dev); 3427 3428 /** 3429 * netif_dormant_on - mark device as dormant. 3430 * @dev: network device 3431 * 3432 * Mark device as dormant (as per RFC2863). 3433 * 3434 * The dormant state indicates that the relevant interface is not 3435 * actually in a condition to pass packets (i.e., it is not 'up') but is 3436 * in a "pending" state, waiting for some external event. For "on- 3437 * demand" interfaces, this new state identifies the situation where the 3438 * interface is waiting for events to place it in the up state. 3439 */ 3440 static inline void netif_dormant_on(struct net_device *dev) 3441 { 3442 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 3443 linkwatch_fire_event(dev); 3444 } 3445 3446 /** 3447 * netif_dormant_off - set device as not dormant. 3448 * @dev: network device 3449 * 3450 * Device is not in dormant state. 3451 */ 3452 static inline void netif_dormant_off(struct net_device *dev) 3453 { 3454 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 3455 linkwatch_fire_event(dev); 3456 } 3457 3458 /** 3459 * netif_dormant - test if device is dormant 3460 * @dev: network device 3461 * 3462 * Check if device is dormant. 3463 */ 3464 static inline bool netif_dormant(const struct net_device *dev) 3465 { 3466 return test_bit(__LINK_STATE_DORMANT, &dev->state); 3467 } 3468 3469 3470 /** 3471 * netif_oper_up - test if device is operational 3472 * @dev: network device 3473 * 3474 * Check if carrier is operational 3475 */ 3476 static inline bool netif_oper_up(const struct net_device *dev) 3477 { 3478 return (dev->operstate == IF_OPER_UP || 3479 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 3480 } 3481 3482 /** 3483 * netif_device_present - is device available or removed 3484 * @dev: network device 3485 * 3486 * Check if device has not been removed from system. 3487 */ 3488 static inline bool netif_device_present(struct net_device *dev) 3489 { 3490 return test_bit(__LINK_STATE_PRESENT, &dev->state); 3491 } 3492 3493 void netif_device_detach(struct net_device *dev); 3494 3495 void netif_device_attach(struct net_device *dev); 3496 3497 /* 3498 * Network interface message level settings 3499 */ 3500 3501 enum { 3502 NETIF_MSG_DRV = 0x0001, 3503 NETIF_MSG_PROBE = 0x0002, 3504 NETIF_MSG_LINK = 0x0004, 3505 NETIF_MSG_TIMER = 0x0008, 3506 NETIF_MSG_IFDOWN = 0x0010, 3507 NETIF_MSG_IFUP = 0x0020, 3508 NETIF_MSG_RX_ERR = 0x0040, 3509 NETIF_MSG_TX_ERR = 0x0080, 3510 NETIF_MSG_TX_QUEUED = 0x0100, 3511 NETIF_MSG_INTR = 0x0200, 3512 NETIF_MSG_TX_DONE = 0x0400, 3513 NETIF_MSG_RX_STATUS = 0x0800, 3514 NETIF_MSG_PKTDATA = 0x1000, 3515 NETIF_MSG_HW = 0x2000, 3516 NETIF_MSG_WOL = 0x4000, 3517 }; 3518 3519 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 3520 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 3521 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 3522 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 3523 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 3524 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 3525 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 3526 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 3527 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 3528 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 3529 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 3530 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 3531 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 3532 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 3533 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 3534 3535 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 3536 { 3537 /* use default */ 3538 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 3539 return default_msg_enable_bits; 3540 if (debug_value == 0) /* no output */ 3541 return 0; 3542 /* set low N bits */ 3543 return (1 << debug_value) - 1; 3544 } 3545 3546 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu) 3547 { 3548 spin_lock(&txq->_xmit_lock); 3549 txq->xmit_lock_owner = cpu; 3550 } 3551 3552 static inline bool __netif_tx_acquire(struct netdev_queue *txq) 3553 { 3554 __acquire(&txq->_xmit_lock); 3555 return true; 3556 } 3557 3558 static inline void __netif_tx_release(struct netdev_queue *txq) 3559 { 3560 __release(&txq->_xmit_lock); 3561 } 3562 3563 static inline void __netif_tx_lock_bh(struct netdev_queue *txq) 3564 { 3565 spin_lock_bh(&txq->_xmit_lock); 3566 txq->xmit_lock_owner = smp_processor_id(); 3567 } 3568 3569 static inline bool __netif_tx_trylock(struct netdev_queue *txq) 3570 { 3571 bool ok = spin_trylock(&txq->_xmit_lock); 3572 if (likely(ok)) 3573 txq->xmit_lock_owner = smp_processor_id(); 3574 return ok; 3575 } 3576 3577 static inline void __netif_tx_unlock(struct netdev_queue *txq) 3578 { 3579 txq->xmit_lock_owner = -1; 3580 spin_unlock(&txq->_xmit_lock); 3581 } 3582 3583 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq) 3584 { 3585 txq->xmit_lock_owner = -1; 3586 spin_unlock_bh(&txq->_xmit_lock); 3587 } 3588 3589 static inline void txq_trans_update(struct netdev_queue *txq) 3590 { 3591 if (txq->xmit_lock_owner != -1) 3592 txq->trans_start = jiffies; 3593 } 3594 3595 /* legacy drivers only, netdev_start_xmit() sets txq->trans_start */ 3596 static inline void netif_trans_update(struct net_device *dev) 3597 { 3598 struct netdev_queue *txq = netdev_get_tx_queue(dev, 0); 3599 3600 if (txq->trans_start != jiffies) 3601 txq->trans_start = jiffies; 3602 } 3603 3604 /** 3605 * netif_tx_lock - grab network device transmit lock 3606 * @dev: network device 3607 * 3608 * Get network device transmit lock 3609 */ 3610 static inline void netif_tx_lock(struct net_device *dev) 3611 { 3612 unsigned int i; 3613 int cpu; 3614 3615 spin_lock(&dev->tx_global_lock); 3616 cpu = smp_processor_id(); 3617 for (i = 0; i < dev->num_tx_queues; i++) { 3618 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 3619 3620 /* We are the only thread of execution doing a 3621 * freeze, but we have to grab the _xmit_lock in 3622 * order to synchronize with threads which are in 3623 * the ->hard_start_xmit() handler and already 3624 * checked the frozen bit. 3625 */ 3626 __netif_tx_lock(txq, cpu); 3627 set_bit(__QUEUE_STATE_FROZEN, &txq->state); 3628 __netif_tx_unlock(txq); 3629 } 3630 } 3631 3632 static inline void netif_tx_lock_bh(struct net_device *dev) 3633 { 3634 local_bh_disable(); 3635 netif_tx_lock(dev); 3636 } 3637 3638 static inline void netif_tx_unlock(struct net_device *dev) 3639 { 3640 unsigned int i; 3641 3642 for (i = 0; i < dev->num_tx_queues; i++) { 3643 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 3644 3645 /* No need to grab the _xmit_lock here. If the 3646 * queue is not stopped for another reason, we 3647 * force a schedule. 3648 */ 3649 clear_bit(__QUEUE_STATE_FROZEN, &txq->state); 3650 netif_schedule_queue(txq); 3651 } 3652 spin_unlock(&dev->tx_global_lock); 3653 } 3654 3655 static inline void netif_tx_unlock_bh(struct net_device *dev) 3656 { 3657 netif_tx_unlock(dev); 3658 local_bh_enable(); 3659 } 3660 3661 #define HARD_TX_LOCK(dev, txq, cpu) { \ 3662 if ((dev->features & NETIF_F_LLTX) == 0) { \ 3663 __netif_tx_lock(txq, cpu); \ 3664 } else { \ 3665 __netif_tx_acquire(txq); \ 3666 } \ 3667 } 3668 3669 #define HARD_TX_TRYLOCK(dev, txq) \ 3670 (((dev->features & NETIF_F_LLTX) == 0) ? \ 3671 __netif_tx_trylock(txq) : \ 3672 __netif_tx_acquire(txq)) 3673 3674 #define HARD_TX_UNLOCK(dev, txq) { \ 3675 if ((dev->features & NETIF_F_LLTX) == 0) { \ 3676 __netif_tx_unlock(txq); \ 3677 } else { \ 3678 __netif_tx_release(txq); \ 3679 } \ 3680 } 3681 3682 static inline void netif_tx_disable(struct net_device *dev) 3683 { 3684 unsigned int i; 3685 int cpu; 3686 3687 local_bh_disable(); 3688 cpu = smp_processor_id(); 3689 for (i = 0; i < dev->num_tx_queues; i++) { 3690 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 3691 3692 __netif_tx_lock(txq, cpu); 3693 netif_tx_stop_queue(txq); 3694 __netif_tx_unlock(txq); 3695 } 3696 local_bh_enable(); 3697 } 3698 3699 static inline void netif_addr_lock(struct net_device *dev) 3700 { 3701 spin_lock(&dev->addr_list_lock); 3702 } 3703 3704 static inline void netif_addr_lock_nested(struct net_device *dev) 3705 { 3706 int subclass = SINGLE_DEPTH_NESTING; 3707 3708 if (dev->netdev_ops->ndo_get_lock_subclass) 3709 subclass = dev->netdev_ops->ndo_get_lock_subclass(dev); 3710 3711 spin_lock_nested(&dev->addr_list_lock, subclass); 3712 } 3713 3714 static inline void netif_addr_lock_bh(struct net_device *dev) 3715 { 3716 spin_lock_bh(&dev->addr_list_lock); 3717 } 3718 3719 static inline void netif_addr_unlock(struct net_device *dev) 3720 { 3721 spin_unlock(&dev->addr_list_lock); 3722 } 3723 3724 static inline void netif_addr_unlock_bh(struct net_device *dev) 3725 { 3726 spin_unlock_bh(&dev->addr_list_lock); 3727 } 3728 3729 /* 3730 * dev_addrs walker. Should be used only for read access. Call with 3731 * rcu_read_lock held. 3732 */ 3733 #define for_each_dev_addr(dev, ha) \ 3734 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list) 3735 3736 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 3737 3738 void ether_setup(struct net_device *dev); 3739 3740 /* Support for loadable net-drivers */ 3741 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, 3742 unsigned char name_assign_type, 3743 void (*setup)(struct net_device *), 3744 unsigned int txqs, unsigned int rxqs); 3745 int dev_get_valid_name(struct net *net, struct net_device *dev, 3746 const char *name); 3747 3748 #define alloc_netdev(sizeof_priv, name, name_assign_type, setup) \ 3749 alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, 1, 1) 3750 3751 #define alloc_netdev_mq(sizeof_priv, name, name_assign_type, setup, count) \ 3752 alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, count, \ 3753 count) 3754 3755 int register_netdev(struct net_device *dev); 3756 void unregister_netdev(struct net_device *dev); 3757 3758 /* General hardware address lists handling functions */ 3759 int __hw_addr_sync(struct netdev_hw_addr_list *to_list, 3760 struct netdev_hw_addr_list *from_list, int addr_len); 3761 void __hw_addr_unsync(struct netdev_hw_addr_list *to_list, 3762 struct netdev_hw_addr_list *from_list, int addr_len); 3763 int __hw_addr_sync_dev(struct netdev_hw_addr_list *list, 3764 struct net_device *dev, 3765 int (*sync)(struct net_device *, const unsigned char *), 3766 int (*unsync)(struct net_device *, 3767 const unsigned char *)); 3768 void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list, 3769 struct net_device *dev, 3770 int (*unsync)(struct net_device *, 3771 const unsigned char *)); 3772 void __hw_addr_init(struct netdev_hw_addr_list *list); 3773 3774 /* Functions used for device addresses handling */ 3775 int dev_addr_add(struct net_device *dev, const unsigned char *addr, 3776 unsigned char addr_type); 3777 int dev_addr_del(struct net_device *dev, const unsigned char *addr, 3778 unsigned char addr_type); 3779 void dev_addr_flush(struct net_device *dev); 3780 int dev_addr_init(struct net_device *dev); 3781 3782 /* Functions used for unicast addresses handling */ 3783 int dev_uc_add(struct net_device *dev, const unsigned char *addr); 3784 int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr); 3785 int dev_uc_del(struct net_device *dev, const unsigned char *addr); 3786 int dev_uc_sync(struct net_device *to, struct net_device *from); 3787 int dev_uc_sync_multiple(struct net_device *to, struct net_device *from); 3788 void dev_uc_unsync(struct net_device *to, struct net_device *from); 3789 void dev_uc_flush(struct net_device *dev); 3790 void dev_uc_init(struct net_device *dev); 3791 3792 /** 3793 * __dev_uc_sync - Synchonize device's unicast list 3794 * @dev: device to sync 3795 * @sync: function to call if address should be added 3796 * @unsync: function to call if address should be removed 3797 * 3798 * Add newly added addresses to the interface, and release 3799 * addresses that have been deleted. 3800 */ 3801 static inline int __dev_uc_sync(struct net_device *dev, 3802 int (*sync)(struct net_device *, 3803 const unsigned char *), 3804 int (*unsync)(struct net_device *, 3805 const unsigned char *)) 3806 { 3807 return __hw_addr_sync_dev(&dev->uc, dev, sync, unsync); 3808 } 3809 3810 /** 3811 * __dev_uc_unsync - Remove synchronized addresses from device 3812 * @dev: device to sync 3813 * @unsync: function to call if address should be removed 3814 * 3815 * Remove all addresses that were added to the device by dev_uc_sync(). 3816 */ 3817 static inline void __dev_uc_unsync(struct net_device *dev, 3818 int (*unsync)(struct net_device *, 3819 const unsigned char *)) 3820 { 3821 __hw_addr_unsync_dev(&dev->uc, dev, unsync); 3822 } 3823 3824 /* Functions used for multicast addresses handling */ 3825 int dev_mc_add(struct net_device *dev, const unsigned char *addr); 3826 int dev_mc_add_global(struct net_device *dev, const unsigned char *addr); 3827 int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr); 3828 int dev_mc_del(struct net_device *dev, const unsigned char *addr); 3829 int dev_mc_del_global(struct net_device *dev, const unsigned char *addr); 3830 int dev_mc_sync(struct net_device *to, struct net_device *from); 3831 int dev_mc_sync_multiple(struct net_device *to, struct net_device *from); 3832 void dev_mc_unsync(struct net_device *to, struct net_device *from); 3833 void dev_mc_flush(struct net_device *dev); 3834 void dev_mc_init(struct net_device *dev); 3835 3836 /** 3837 * __dev_mc_sync - Synchonize device's multicast list 3838 * @dev: device to sync 3839 * @sync: function to call if address should be added 3840 * @unsync: function to call if address should be removed 3841 * 3842 * Add newly added addresses to the interface, and release 3843 * addresses that have been deleted. 3844 */ 3845 static inline int __dev_mc_sync(struct net_device *dev, 3846 int (*sync)(struct net_device *, 3847 const unsigned char *), 3848 int (*unsync)(struct net_device *, 3849 const unsigned char *)) 3850 { 3851 return __hw_addr_sync_dev(&dev->mc, dev, sync, unsync); 3852 } 3853 3854 /** 3855 * __dev_mc_unsync - Remove synchronized addresses from device 3856 * @dev: device to sync 3857 * @unsync: function to call if address should be removed 3858 * 3859 * Remove all addresses that were added to the device by dev_mc_sync(). 3860 */ 3861 static inline void __dev_mc_unsync(struct net_device *dev, 3862 int (*unsync)(struct net_device *, 3863 const unsigned char *)) 3864 { 3865 __hw_addr_unsync_dev(&dev->mc, dev, unsync); 3866 } 3867 3868 /* Functions used for secondary unicast and multicast support */ 3869 void dev_set_rx_mode(struct net_device *dev); 3870 void __dev_set_rx_mode(struct net_device *dev); 3871 int dev_set_promiscuity(struct net_device *dev, int inc); 3872 int dev_set_allmulti(struct net_device *dev, int inc); 3873 void netdev_state_change(struct net_device *dev); 3874 void netdev_notify_peers(struct net_device *dev); 3875 void netdev_features_change(struct net_device *dev); 3876 /* Load a device via the kmod */ 3877 void dev_load(struct net *net, const char *name); 3878 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, 3879 struct rtnl_link_stats64 *storage); 3880 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, 3881 const struct net_device_stats *netdev_stats); 3882 3883 extern int netdev_max_backlog; 3884 extern int netdev_tstamp_prequeue; 3885 extern int weight_p; 3886 extern int dev_weight_rx_bias; 3887 extern int dev_weight_tx_bias; 3888 extern int dev_rx_weight; 3889 extern int dev_tx_weight; 3890 3891 bool netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev); 3892 struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, 3893 struct list_head **iter); 3894 struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev, 3895 struct list_head **iter); 3896 3897 /* iterate through upper list, must be called under RCU read lock */ 3898 #define netdev_for_each_upper_dev_rcu(dev, updev, iter) \ 3899 for (iter = &(dev)->adj_list.upper, \ 3900 updev = netdev_upper_get_next_dev_rcu(dev, &(iter)); \ 3901 updev; \ 3902 updev = netdev_upper_get_next_dev_rcu(dev, &(iter))) 3903 3904 int netdev_walk_all_upper_dev_rcu(struct net_device *dev, 3905 int (*fn)(struct net_device *upper_dev, 3906 void *data), 3907 void *data); 3908 3909 bool netdev_has_upper_dev_all_rcu(struct net_device *dev, 3910 struct net_device *upper_dev); 3911 3912 bool netdev_has_any_upper_dev(struct net_device *dev); 3913 3914 void *netdev_lower_get_next_private(struct net_device *dev, 3915 struct list_head **iter); 3916 void *netdev_lower_get_next_private_rcu(struct net_device *dev, 3917 struct list_head **iter); 3918 3919 #define netdev_for_each_lower_private(dev, priv, iter) \ 3920 for (iter = (dev)->adj_list.lower.next, \ 3921 priv = netdev_lower_get_next_private(dev, &(iter)); \ 3922 priv; \ 3923 priv = netdev_lower_get_next_private(dev, &(iter))) 3924 3925 #define netdev_for_each_lower_private_rcu(dev, priv, iter) \ 3926 for (iter = &(dev)->adj_list.lower, \ 3927 priv = netdev_lower_get_next_private_rcu(dev, &(iter)); \ 3928 priv; \ 3929 priv = netdev_lower_get_next_private_rcu(dev, &(iter))) 3930 3931 void *netdev_lower_get_next(struct net_device *dev, 3932 struct list_head **iter); 3933 3934 #define netdev_for_each_lower_dev(dev, ldev, iter) \ 3935 for (iter = (dev)->adj_list.lower.next, \ 3936 ldev = netdev_lower_get_next(dev, &(iter)); \ 3937 ldev; \ 3938 ldev = netdev_lower_get_next(dev, &(iter))) 3939 3940 struct net_device *netdev_all_lower_get_next(struct net_device *dev, 3941 struct list_head **iter); 3942 struct net_device *netdev_all_lower_get_next_rcu(struct net_device *dev, 3943 struct list_head **iter); 3944 3945 int netdev_walk_all_lower_dev(struct net_device *dev, 3946 int (*fn)(struct net_device *lower_dev, 3947 void *data), 3948 void *data); 3949 int netdev_walk_all_lower_dev_rcu(struct net_device *dev, 3950 int (*fn)(struct net_device *lower_dev, 3951 void *data), 3952 void *data); 3953 3954 void *netdev_adjacent_get_private(struct list_head *adj_list); 3955 void *netdev_lower_get_first_private_rcu(struct net_device *dev); 3956 struct net_device *netdev_master_upper_dev_get(struct net_device *dev); 3957 struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev); 3958 int netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev, 3959 struct netlink_ext_ack *extack); 3960 int netdev_master_upper_dev_link(struct net_device *dev, 3961 struct net_device *upper_dev, 3962 void *upper_priv, void *upper_info, 3963 struct netlink_ext_ack *extack); 3964 void netdev_upper_dev_unlink(struct net_device *dev, 3965 struct net_device *upper_dev); 3966 void netdev_adjacent_rename_links(struct net_device *dev, char *oldname); 3967 void *netdev_lower_dev_get_private(struct net_device *dev, 3968 struct net_device *lower_dev); 3969 void netdev_lower_state_changed(struct net_device *lower_dev, 3970 void *lower_state_info); 3971 3972 /* RSS keys are 40 or 52 bytes long */ 3973 #define NETDEV_RSS_KEY_LEN 52 3974 extern u8 netdev_rss_key[NETDEV_RSS_KEY_LEN] __read_mostly; 3975 void netdev_rss_key_fill(void *buffer, size_t len); 3976 3977 int dev_get_nest_level(struct net_device *dev); 3978 int skb_checksum_help(struct sk_buff *skb); 3979 int skb_crc32c_csum_help(struct sk_buff *skb); 3980 int skb_csum_hwoffload_help(struct sk_buff *skb, 3981 const netdev_features_t features); 3982 3983 struct sk_buff *__skb_gso_segment(struct sk_buff *skb, 3984 netdev_features_t features, bool tx_path); 3985 struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb, 3986 netdev_features_t features); 3987 3988 struct netdev_bonding_info { 3989 ifslave slave; 3990 ifbond master; 3991 }; 3992 3993 struct netdev_notifier_bonding_info { 3994 struct netdev_notifier_info info; /* must be first */ 3995 struct netdev_bonding_info bonding_info; 3996 }; 3997 3998 void netdev_bonding_info_change(struct net_device *dev, 3999 struct netdev_bonding_info *bonding_info); 4000 4001 static inline 4002 struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features) 4003 { 4004 return __skb_gso_segment(skb, features, true); 4005 } 4006 __be16 skb_network_protocol(struct sk_buff *skb, int *depth); 4007 4008 static inline bool can_checksum_protocol(netdev_features_t features, 4009 __be16 protocol) 4010 { 4011 if (protocol == htons(ETH_P_FCOE)) 4012 return !!(features & NETIF_F_FCOE_CRC); 4013 4014 /* Assume this is an IP checksum (not SCTP CRC) */ 4015 4016 if (features & NETIF_F_HW_CSUM) { 4017 /* Can checksum everything */ 4018 return true; 4019 } 4020 4021 switch (protocol) { 4022 case htons(ETH_P_IP): 4023 return !!(features & NETIF_F_IP_CSUM); 4024 case htons(ETH_P_IPV6): 4025 return !!(features & NETIF_F_IPV6_CSUM); 4026 default: 4027 return false; 4028 } 4029 } 4030 4031 #ifdef CONFIG_BUG 4032 void netdev_rx_csum_fault(struct net_device *dev); 4033 #else 4034 static inline void netdev_rx_csum_fault(struct net_device *dev) 4035 { 4036 } 4037 #endif 4038 /* rx skb timestamps */ 4039 void net_enable_timestamp(void); 4040 void net_disable_timestamp(void); 4041 4042 #ifdef CONFIG_PROC_FS 4043 int __init dev_proc_init(void); 4044 #else 4045 #define dev_proc_init() 0 4046 #endif 4047 4048 static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops, 4049 struct sk_buff *skb, struct net_device *dev, 4050 bool more) 4051 { 4052 skb->xmit_more = more ? 1 : 0; 4053 return ops->ndo_start_xmit(skb, dev); 4054 } 4055 4056 static inline netdev_tx_t netdev_start_xmit(struct sk_buff *skb, struct net_device *dev, 4057 struct netdev_queue *txq, bool more) 4058 { 4059 const struct net_device_ops *ops = dev->netdev_ops; 4060 int rc; 4061 4062 rc = __netdev_start_xmit(ops, skb, dev, more); 4063 if (rc == NETDEV_TX_OK) 4064 txq_trans_update(txq); 4065 4066 return rc; 4067 } 4068 4069 int netdev_class_create_file_ns(const struct class_attribute *class_attr, 4070 const void *ns); 4071 void netdev_class_remove_file_ns(const struct class_attribute *class_attr, 4072 const void *ns); 4073 4074 static inline int netdev_class_create_file(const struct class_attribute *class_attr) 4075 { 4076 return netdev_class_create_file_ns(class_attr, NULL); 4077 } 4078 4079 static inline void netdev_class_remove_file(const struct class_attribute *class_attr) 4080 { 4081 netdev_class_remove_file_ns(class_attr, NULL); 4082 } 4083 4084 extern const struct kobj_ns_type_operations net_ns_type_operations; 4085 4086 const char *netdev_drivername(const struct net_device *dev); 4087 4088 void linkwatch_run_queue(void); 4089 4090 static inline netdev_features_t netdev_intersect_features(netdev_features_t f1, 4091 netdev_features_t f2) 4092 { 4093 if ((f1 ^ f2) & NETIF_F_HW_CSUM) { 4094 if (f1 & NETIF_F_HW_CSUM) 4095 f1 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); 4096 else 4097 f2 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); 4098 } 4099 4100 return f1 & f2; 4101 } 4102 4103 static inline netdev_features_t netdev_get_wanted_features( 4104 struct net_device *dev) 4105 { 4106 return (dev->features & ~dev->hw_features) | dev->wanted_features; 4107 } 4108 netdev_features_t netdev_increment_features(netdev_features_t all, 4109 netdev_features_t one, netdev_features_t mask); 4110 4111 /* Allow TSO being used on stacked device : 4112 * Performing the GSO segmentation before last device 4113 * is a performance improvement. 4114 */ 4115 static inline netdev_features_t netdev_add_tso_features(netdev_features_t features, 4116 netdev_features_t mask) 4117 { 4118 return netdev_increment_features(features, NETIF_F_ALL_TSO, mask); 4119 } 4120 4121 int __netdev_update_features(struct net_device *dev); 4122 void netdev_update_features(struct net_device *dev); 4123 void netdev_change_features(struct net_device *dev); 4124 4125 void netif_stacked_transfer_operstate(const struct net_device *rootdev, 4126 struct net_device *dev); 4127 4128 netdev_features_t passthru_features_check(struct sk_buff *skb, 4129 struct net_device *dev, 4130 netdev_features_t features); 4131 netdev_features_t netif_skb_features(struct sk_buff *skb); 4132 4133 static inline bool net_gso_ok(netdev_features_t features, int gso_type) 4134 { 4135 netdev_features_t feature = (netdev_features_t)gso_type << NETIF_F_GSO_SHIFT; 4136 4137 /* check flags correspondence */ 4138 BUILD_BUG_ON(SKB_GSO_TCPV4 != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT)); 4139 BUILD_BUG_ON(SKB_GSO_DODGY != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT)); 4140 BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT)); 4141 BUILD_BUG_ON(SKB_GSO_TCP_FIXEDID != (NETIF_F_TSO_MANGLEID >> NETIF_F_GSO_SHIFT)); 4142 BUILD_BUG_ON(SKB_GSO_TCPV6 != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT)); 4143 BUILD_BUG_ON(SKB_GSO_FCOE != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT)); 4144 BUILD_BUG_ON(SKB_GSO_GRE != (NETIF_F_GSO_GRE >> NETIF_F_GSO_SHIFT)); 4145 BUILD_BUG_ON(SKB_GSO_GRE_CSUM != (NETIF_F_GSO_GRE_CSUM >> NETIF_F_GSO_SHIFT)); 4146 BUILD_BUG_ON(SKB_GSO_IPXIP4 != (NETIF_F_GSO_IPXIP4 >> NETIF_F_GSO_SHIFT)); 4147 BUILD_BUG_ON(SKB_GSO_IPXIP6 != (NETIF_F_GSO_IPXIP6 >> NETIF_F_GSO_SHIFT)); 4148 BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL != (NETIF_F_GSO_UDP_TUNNEL >> NETIF_F_GSO_SHIFT)); 4149 BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL_CSUM != (NETIF_F_GSO_UDP_TUNNEL_CSUM >> NETIF_F_GSO_SHIFT)); 4150 BUILD_BUG_ON(SKB_GSO_PARTIAL != (NETIF_F_GSO_PARTIAL >> NETIF_F_GSO_SHIFT)); 4151 BUILD_BUG_ON(SKB_GSO_TUNNEL_REMCSUM != (NETIF_F_GSO_TUNNEL_REMCSUM >> NETIF_F_GSO_SHIFT)); 4152 BUILD_BUG_ON(SKB_GSO_SCTP != (NETIF_F_GSO_SCTP >> NETIF_F_GSO_SHIFT)); 4153 BUILD_BUG_ON(SKB_GSO_ESP != (NETIF_F_GSO_ESP >> NETIF_F_GSO_SHIFT)); 4154 BUILD_BUG_ON(SKB_GSO_UDP != (NETIF_F_GSO_UDP >> NETIF_F_GSO_SHIFT)); 4155 4156 return (features & feature) == feature; 4157 } 4158 4159 static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features) 4160 { 4161 return net_gso_ok(features, skb_shinfo(skb)->gso_type) && 4162 (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST)); 4163 } 4164 4165 static inline bool netif_needs_gso(struct sk_buff *skb, 4166 netdev_features_t features) 4167 { 4168 return skb_is_gso(skb) && (!skb_gso_ok(skb, features) || 4169 unlikely((skb->ip_summed != CHECKSUM_PARTIAL) && 4170 (skb->ip_summed != CHECKSUM_UNNECESSARY))); 4171 } 4172 4173 static inline void netif_set_gso_max_size(struct net_device *dev, 4174 unsigned int size) 4175 { 4176 dev->gso_max_size = size; 4177 } 4178 4179 static inline void skb_gso_error_unwind(struct sk_buff *skb, __be16 protocol, 4180 int pulled_hlen, u16 mac_offset, 4181 int mac_len) 4182 { 4183 skb->protocol = protocol; 4184 skb->encapsulation = 1; 4185 skb_push(skb, pulled_hlen); 4186 skb_reset_transport_header(skb); 4187 skb->mac_header = mac_offset; 4188 skb->network_header = skb->mac_header + mac_len; 4189 skb->mac_len = mac_len; 4190 } 4191 4192 static inline bool netif_is_macsec(const struct net_device *dev) 4193 { 4194 return dev->priv_flags & IFF_MACSEC; 4195 } 4196 4197 static inline bool netif_is_macvlan(const struct net_device *dev) 4198 { 4199 return dev->priv_flags & IFF_MACVLAN; 4200 } 4201 4202 static inline bool netif_is_macvlan_port(const struct net_device *dev) 4203 { 4204 return dev->priv_flags & IFF_MACVLAN_PORT; 4205 } 4206 4207 static inline bool netif_is_ipvlan(const struct net_device *dev) 4208 { 4209 return dev->priv_flags & IFF_IPVLAN_SLAVE; 4210 } 4211 4212 static inline bool netif_is_ipvlan_port(const struct net_device *dev) 4213 { 4214 return dev->priv_flags & IFF_IPVLAN_MASTER; 4215 } 4216 4217 static inline bool netif_is_bond_master(const struct net_device *dev) 4218 { 4219 return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING; 4220 } 4221 4222 static inline bool netif_is_bond_slave(const struct net_device *dev) 4223 { 4224 return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING; 4225 } 4226 4227 static inline bool netif_supports_nofcs(struct net_device *dev) 4228 { 4229 return dev->priv_flags & IFF_SUPP_NOFCS; 4230 } 4231 4232 static inline bool netif_is_l3_master(const struct net_device *dev) 4233 { 4234 return dev->priv_flags & IFF_L3MDEV_MASTER; 4235 } 4236 4237 static inline bool netif_is_l3_slave(const struct net_device *dev) 4238 { 4239 return dev->priv_flags & IFF_L3MDEV_SLAVE; 4240 } 4241 4242 static inline bool netif_is_bridge_master(const struct net_device *dev) 4243 { 4244 return dev->priv_flags & IFF_EBRIDGE; 4245 } 4246 4247 static inline bool netif_is_bridge_port(const struct net_device *dev) 4248 { 4249 return dev->priv_flags & IFF_BRIDGE_PORT; 4250 } 4251 4252 static inline bool netif_is_ovs_master(const struct net_device *dev) 4253 { 4254 return dev->priv_flags & IFF_OPENVSWITCH; 4255 } 4256 4257 static inline bool netif_is_ovs_port(const struct net_device *dev) 4258 { 4259 return dev->priv_flags & IFF_OVS_DATAPATH; 4260 } 4261 4262 static inline bool netif_is_team_master(const struct net_device *dev) 4263 { 4264 return dev->priv_flags & IFF_TEAM; 4265 } 4266 4267 static inline bool netif_is_team_port(const struct net_device *dev) 4268 { 4269 return dev->priv_flags & IFF_TEAM_PORT; 4270 } 4271 4272 static inline bool netif_is_lag_master(const struct net_device *dev) 4273 { 4274 return netif_is_bond_master(dev) || netif_is_team_master(dev); 4275 } 4276 4277 static inline bool netif_is_lag_port(const struct net_device *dev) 4278 { 4279 return netif_is_bond_slave(dev) || netif_is_team_port(dev); 4280 } 4281 4282 static inline bool netif_is_rxfh_configured(const struct net_device *dev) 4283 { 4284 return dev->priv_flags & IFF_RXFH_CONFIGURED; 4285 } 4286 4287 /* This device needs to keep skb dst for qdisc enqueue or ndo_start_xmit() */ 4288 static inline void netif_keep_dst(struct net_device *dev) 4289 { 4290 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM); 4291 } 4292 4293 /* return true if dev can't cope with mtu frames that need vlan tag insertion */ 4294 static inline bool netif_reduces_vlan_mtu(struct net_device *dev) 4295 { 4296 /* TODO: reserve and use an additional IFF bit, if we get more users */ 4297 return dev->priv_flags & IFF_MACSEC; 4298 } 4299 4300 extern struct pernet_operations __net_initdata loopback_net_ops; 4301 4302 /* Logging, debugging and troubleshooting/diagnostic helpers. */ 4303 4304 /* netdev_printk helpers, similar to dev_printk */ 4305 4306 static inline const char *netdev_name(const struct net_device *dev) 4307 { 4308 if (!dev->name[0] || strchr(dev->name, '%')) 4309 return "(unnamed net_device)"; 4310 return dev->name; 4311 } 4312 4313 static inline bool netdev_unregistering(const struct net_device *dev) 4314 { 4315 return dev->reg_state == NETREG_UNREGISTERING; 4316 } 4317 4318 static inline const char *netdev_reg_state(const struct net_device *dev) 4319 { 4320 switch (dev->reg_state) { 4321 case NETREG_UNINITIALIZED: return " (uninitialized)"; 4322 case NETREG_REGISTERED: return ""; 4323 case NETREG_UNREGISTERING: return " (unregistering)"; 4324 case NETREG_UNREGISTERED: return " (unregistered)"; 4325 case NETREG_RELEASED: return " (released)"; 4326 case NETREG_DUMMY: return " (dummy)"; 4327 } 4328 4329 WARN_ONCE(1, "%s: unknown reg_state %d\n", dev->name, dev->reg_state); 4330 return " (unknown)"; 4331 } 4332 4333 __printf(3, 4) 4334 void netdev_printk(const char *level, const struct net_device *dev, 4335 const char *format, ...); 4336 __printf(2, 3) 4337 void netdev_emerg(const struct net_device *dev, const char *format, ...); 4338 __printf(2, 3) 4339 void netdev_alert(const struct net_device *dev, const char *format, ...); 4340 __printf(2, 3) 4341 void netdev_crit(const struct net_device *dev, const char *format, ...); 4342 __printf(2, 3) 4343 void netdev_err(const struct net_device *dev, const char *format, ...); 4344 __printf(2, 3) 4345 void netdev_warn(const struct net_device *dev, const char *format, ...); 4346 __printf(2, 3) 4347 void netdev_notice(const struct net_device *dev, const char *format, ...); 4348 __printf(2, 3) 4349 void netdev_info(const struct net_device *dev, const char *format, ...); 4350 4351 #define netdev_level_once(level, dev, fmt, ...) \ 4352 do { \ 4353 static bool __print_once __read_mostly; \ 4354 \ 4355 if (!__print_once) { \ 4356 __print_once = true; \ 4357 netdev_printk(level, dev, fmt, ##__VA_ARGS__); \ 4358 } \ 4359 } while (0) 4360 4361 #define netdev_emerg_once(dev, fmt, ...) \ 4362 netdev_level_once(KERN_EMERG, dev, fmt, ##__VA_ARGS__) 4363 #define netdev_alert_once(dev, fmt, ...) \ 4364 netdev_level_once(KERN_ALERT, dev, fmt, ##__VA_ARGS__) 4365 #define netdev_crit_once(dev, fmt, ...) \ 4366 netdev_level_once(KERN_CRIT, dev, fmt, ##__VA_ARGS__) 4367 #define netdev_err_once(dev, fmt, ...) \ 4368 netdev_level_once(KERN_ERR, dev, fmt, ##__VA_ARGS__) 4369 #define netdev_warn_once(dev, fmt, ...) \ 4370 netdev_level_once(KERN_WARNING, dev, fmt, ##__VA_ARGS__) 4371 #define netdev_notice_once(dev, fmt, ...) \ 4372 netdev_level_once(KERN_NOTICE, dev, fmt, ##__VA_ARGS__) 4373 #define netdev_info_once(dev, fmt, ...) \ 4374 netdev_level_once(KERN_INFO, dev, fmt, ##__VA_ARGS__) 4375 4376 #define MODULE_ALIAS_NETDEV(device) \ 4377 MODULE_ALIAS("netdev-" device) 4378 4379 #if defined(CONFIG_DYNAMIC_DEBUG) 4380 #define netdev_dbg(__dev, format, args...) \ 4381 do { \ 4382 dynamic_netdev_dbg(__dev, format, ##args); \ 4383 } while (0) 4384 #elif defined(DEBUG) 4385 #define netdev_dbg(__dev, format, args...) \ 4386 netdev_printk(KERN_DEBUG, __dev, format, ##args) 4387 #else 4388 #define netdev_dbg(__dev, format, args...) \ 4389 ({ \ 4390 if (0) \ 4391 netdev_printk(KERN_DEBUG, __dev, format, ##args); \ 4392 }) 4393 #endif 4394 4395 #if defined(VERBOSE_DEBUG) 4396 #define netdev_vdbg netdev_dbg 4397 #else 4398 4399 #define netdev_vdbg(dev, format, args...) \ 4400 ({ \ 4401 if (0) \ 4402 netdev_printk(KERN_DEBUG, dev, format, ##args); \ 4403 0; \ 4404 }) 4405 #endif 4406 4407 /* 4408 * netdev_WARN() acts like dev_printk(), but with the key difference 4409 * of using a WARN/WARN_ON to get the message out, including the 4410 * file/line information and a backtrace. 4411 */ 4412 #define netdev_WARN(dev, format, args...) \ 4413 WARN(1, "netdevice: %s%s: " format, netdev_name(dev), \ 4414 netdev_reg_state(dev), ##args) 4415 4416 #define netdev_WARN_ONCE(dev, format, args...) \ 4417 WARN_ONCE(1, "netdevice: %s%s: " format, netdev_name(dev), \ 4418 netdev_reg_state(dev), ##args) 4419 4420 /* netif printk helpers, similar to netdev_printk */ 4421 4422 #define netif_printk(priv, type, level, dev, fmt, args...) \ 4423 do { \ 4424 if (netif_msg_##type(priv)) \ 4425 netdev_printk(level, (dev), fmt, ##args); \ 4426 } while (0) 4427 4428 #define netif_level(level, priv, type, dev, fmt, args...) \ 4429 do { \ 4430 if (netif_msg_##type(priv)) \ 4431 netdev_##level(dev, fmt, ##args); \ 4432 } while (0) 4433 4434 #define netif_emerg(priv, type, dev, fmt, args...) \ 4435 netif_level(emerg, priv, type, dev, fmt, ##args) 4436 #define netif_alert(priv, type, dev, fmt, args...) \ 4437 netif_level(alert, priv, type, dev, fmt, ##args) 4438 #define netif_crit(priv, type, dev, fmt, args...) \ 4439 netif_level(crit, priv, type, dev, fmt, ##args) 4440 #define netif_err(priv, type, dev, fmt, args...) \ 4441 netif_level(err, priv, type, dev, fmt, ##args) 4442 #define netif_warn(priv, type, dev, fmt, args...) \ 4443 netif_level(warn, priv, type, dev, fmt, ##args) 4444 #define netif_notice(priv, type, dev, fmt, args...) \ 4445 netif_level(notice, priv, type, dev, fmt, ##args) 4446 #define netif_info(priv, type, dev, fmt, args...) \ 4447 netif_level(info, priv, type, dev, fmt, ##args) 4448 4449 #if defined(CONFIG_DYNAMIC_DEBUG) 4450 #define netif_dbg(priv, type, netdev, format, args...) \ 4451 do { \ 4452 if (netif_msg_##type(priv)) \ 4453 dynamic_netdev_dbg(netdev, format, ##args); \ 4454 } while (0) 4455 #elif defined(DEBUG) 4456 #define netif_dbg(priv, type, dev, format, args...) \ 4457 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args) 4458 #else 4459 #define netif_dbg(priv, type, dev, format, args...) \ 4460 ({ \ 4461 if (0) \ 4462 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \ 4463 0; \ 4464 }) 4465 #endif 4466 4467 /* if @cond then downgrade to debug, else print at @level */ 4468 #define netif_cond_dbg(priv, type, netdev, cond, level, fmt, args...) \ 4469 do { \ 4470 if (cond) \ 4471 netif_dbg(priv, type, netdev, fmt, ##args); \ 4472 else \ 4473 netif_ ## level(priv, type, netdev, fmt, ##args); \ 4474 } while (0) 4475 4476 #if defined(VERBOSE_DEBUG) 4477 #define netif_vdbg netif_dbg 4478 #else 4479 #define netif_vdbg(priv, type, dev, format, args...) \ 4480 ({ \ 4481 if (0) \ 4482 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \ 4483 0; \ 4484 }) 4485 #endif 4486 4487 /* 4488 * The list of packet types we will receive (as opposed to discard) 4489 * and the routines to invoke. 4490 * 4491 * Why 16. Because with 16 the only overlap we get on a hash of the 4492 * low nibble of the protocol value is RARP/SNAP/X.25. 4493 * 4494 * 0800 IP 4495 * 0001 802.3 4496 * 0002 AX.25 4497 * 0004 802.2 4498 * 8035 RARP 4499 * 0005 SNAP 4500 * 0805 X.25 4501 * 0806 ARP 4502 * 8137 IPX 4503 * 0009 Localtalk 4504 * 86DD IPv6 4505 */ 4506 #define PTYPE_HASH_SIZE (16) 4507 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1) 4508 4509 #endif /* _LINUX_NETDEVICE_H */ 4510