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/if.h> 29 #include <linux/if_ether.h> 30 #include <linux/if_packet.h> 31 #include <linux/if_link.h> 32 33 #ifdef __KERNEL__ 34 #include <linux/pm_qos_params.h> 35 #include <linux/timer.h> 36 #include <linux/delay.h> 37 #include <linux/mm.h> 38 #include <asm/atomic.h> 39 #include <asm/cache.h> 40 #include <asm/byteorder.h> 41 42 #include <linux/device.h> 43 #include <linux/percpu.h> 44 #include <linux/rculist.h> 45 #include <linux/dmaengine.h> 46 #include <linux/workqueue.h> 47 48 #include <linux/ethtool.h> 49 #include <net/net_namespace.h> 50 #include <net/dsa.h> 51 #ifdef CONFIG_DCB 52 #include <net/dcbnl.h> 53 #endif 54 55 struct vlan_group; 56 struct netpoll_info; 57 struct phy_device; 58 /* 802.11 specific */ 59 struct wireless_dev; 60 /* source back-compat hooks */ 61 #define SET_ETHTOOL_OPS(netdev,ops) \ 62 ( (netdev)->ethtool_ops = (ops) ) 63 64 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev 65 functions are available. */ 66 #define HAVE_FREE_NETDEV /* free_netdev() */ 67 #define HAVE_NETDEV_PRIV /* netdev_priv() */ 68 69 /* hardware address assignment types */ 70 #define NET_ADDR_PERM 0 /* address is permanent (default) */ 71 #define NET_ADDR_RANDOM 1 /* address is generated randomly */ 72 #define NET_ADDR_STOLEN 2 /* address is stolen from other device */ 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(), 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_POLICED 0x03 /* skb is shot by police */ 100 #define NET_XMIT_MASK 0x0f /* qdisc flags in net/sch_generic.h */ 101 102 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It 103 * indicates that the device will soon be dropping packets, or already drops 104 * some packets of the same priority; prompting us to send less aggressively. */ 105 #define net_xmit_eval(e) ((e) == NET_XMIT_CN ? 0 : (e)) 106 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0) 107 108 /* Driver transmit return codes */ 109 #define NETDEV_TX_MASK 0xf0 110 111 enum netdev_tx { 112 __NETDEV_TX_MIN = INT_MIN, /* make sure enum is signed */ 113 NETDEV_TX_OK = 0x00, /* driver took care of packet */ 114 NETDEV_TX_BUSY = 0x10, /* driver tx path was busy*/ 115 NETDEV_TX_LOCKED = 0x20, /* driver tx lock was already taken */ 116 }; 117 typedef enum netdev_tx netdev_tx_t; 118 119 /* 120 * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant; 121 * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed. 122 */ 123 static inline bool dev_xmit_complete(int rc) 124 { 125 /* 126 * Positive cases with an skb consumed by a driver: 127 * - successful transmission (rc == NETDEV_TX_OK) 128 * - error while transmitting (rc < 0) 129 * - error while queueing to a different device (rc & NET_XMIT_MASK) 130 */ 131 if (likely(rc < NET_XMIT_MASK)) 132 return true; 133 134 return false; 135 } 136 137 #endif 138 139 #define MAX_ADDR_LEN 32 /* Largest hardware address length */ 140 141 #ifdef __KERNEL__ 142 /* 143 * Compute the worst case header length according to the protocols 144 * used. 145 */ 146 147 #if defined(CONFIG_WLAN) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 148 # if defined(CONFIG_MAC80211_MESH) 149 # define LL_MAX_HEADER 128 150 # else 151 # define LL_MAX_HEADER 96 152 # endif 153 #elif defined(CONFIG_TR) || defined(CONFIG_TR_MODULE) 154 # define LL_MAX_HEADER 48 155 #else 156 # define LL_MAX_HEADER 32 157 #endif 158 159 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \ 160 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \ 161 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \ 162 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE) 163 #define MAX_HEADER LL_MAX_HEADER 164 #else 165 #define MAX_HEADER (LL_MAX_HEADER + 48) 166 #endif 167 168 /* 169 * Old network device statistics. Fields are native words 170 * (unsigned long) so they can be read and written atomically. 171 */ 172 173 struct net_device_stats { 174 unsigned long rx_packets; 175 unsigned long tx_packets; 176 unsigned long rx_bytes; 177 unsigned long tx_bytes; 178 unsigned long rx_errors; 179 unsigned long tx_errors; 180 unsigned long rx_dropped; 181 unsigned long tx_dropped; 182 unsigned long multicast; 183 unsigned long collisions; 184 unsigned long rx_length_errors; 185 unsigned long rx_over_errors; 186 unsigned long rx_crc_errors; 187 unsigned long rx_frame_errors; 188 unsigned long rx_fifo_errors; 189 unsigned long rx_missed_errors; 190 unsigned long tx_aborted_errors; 191 unsigned long tx_carrier_errors; 192 unsigned long tx_fifo_errors; 193 unsigned long tx_heartbeat_errors; 194 unsigned long tx_window_errors; 195 unsigned long rx_compressed; 196 unsigned long tx_compressed; 197 }; 198 199 #endif /* __KERNEL__ */ 200 201 202 /* Media selection options. */ 203 enum { 204 IF_PORT_UNKNOWN = 0, 205 IF_PORT_10BASE2, 206 IF_PORT_10BASET, 207 IF_PORT_AUI, 208 IF_PORT_100BASET, 209 IF_PORT_100BASETX, 210 IF_PORT_100BASEFX 211 }; 212 213 #ifdef __KERNEL__ 214 215 #include <linux/cache.h> 216 #include <linux/skbuff.h> 217 218 struct neighbour; 219 struct neigh_parms; 220 struct sk_buff; 221 222 struct netdev_hw_addr { 223 struct list_head list; 224 unsigned char addr[MAX_ADDR_LEN]; 225 unsigned char type; 226 #define NETDEV_HW_ADDR_T_LAN 1 227 #define NETDEV_HW_ADDR_T_SAN 2 228 #define NETDEV_HW_ADDR_T_SLAVE 3 229 #define NETDEV_HW_ADDR_T_UNICAST 4 230 #define NETDEV_HW_ADDR_T_MULTICAST 5 231 bool synced; 232 bool global_use; 233 int refcount; 234 struct rcu_head rcu_head; 235 }; 236 237 struct netdev_hw_addr_list { 238 struct list_head list; 239 int count; 240 }; 241 242 #define netdev_hw_addr_list_count(l) ((l)->count) 243 #define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0) 244 #define netdev_hw_addr_list_for_each(ha, l) \ 245 list_for_each_entry(ha, &(l)->list, list) 246 247 #define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc) 248 #define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc) 249 #define netdev_for_each_uc_addr(ha, dev) \ 250 netdev_hw_addr_list_for_each(ha, &(dev)->uc) 251 252 #define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc) 253 #define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc) 254 #define netdev_for_each_mc_addr(ha, dev) \ 255 netdev_hw_addr_list_for_each(ha, &(dev)->mc) 256 257 struct hh_cache { 258 struct hh_cache *hh_next; /* Next entry */ 259 atomic_t hh_refcnt; /* number of users */ 260 /* 261 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate 262 * cache line on SMP. 263 * They are mostly read, but hh_refcnt may be changed quite frequently, 264 * incurring cache line ping pongs. 265 */ 266 __be16 hh_type ____cacheline_aligned_in_smp; 267 /* protocol identifier, f.e ETH_P_IP 268 * NOTE: For VLANs, this will be the 269 * encapuslated type. --BLG 270 */ 271 u16 hh_len; /* length of header */ 272 int (*hh_output)(struct sk_buff *skb); 273 seqlock_t hh_lock; 274 275 /* cached hardware header; allow for machine alignment needs. */ 276 #define HH_DATA_MOD 16 277 #define HH_DATA_OFF(__len) \ 278 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) 279 #define HH_DATA_ALIGN(__len) \ 280 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) 281 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; 282 }; 283 284 static inline void hh_cache_put(struct hh_cache *hh) 285 { 286 if (atomic_dec_and_test(&hh->hh_refcnt)) 287 kfree(hh); 288 } 289 290 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much. 291 * Alternative is: 292 * dev->hard_header_len ? (dev->hard_header_len + 293 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 294 * 295 * We could use other alignment values, but we must maintain the 296 * relationship HH alignment <= LL alignment. 297 * 298 * LL_ALLOCATED_SPACE also takes into account the tailroom the device 299 * may need. 300 */ 301 #define LL_RESERVED_SPACE(dev) \ 302 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 303 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 304 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 305 #define LL_ALLOCATED_SPACE(dev) \ 306 ((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 307 308 struct header_ops { 309 int (*create) (struct sk_buff *skb, struct net_device *dev, 310 unsigned short type, const void *daddr, 311 const void *saddr, unsigned len); 312 int (*parse)(const struct sk_buff *skb, unsigned char *haddr); 313 int (*rebuild)(struct sk_buff *skb); 314 #define HAVE_HEADER_CACHE 315 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh); 316 void (*cache_update)(struct hh_cache *hh, 317 const struct net_device *dev, 318 const unsigned char *haddr); 319 }; 320 321 /* These flag bits are private to the generic network queueing 322 * layer, they may not be explicitly referenced by any other 323 * code. 324 */ 325 326 enum netdev_state_t { 327 __LINK_STATE_START, 328 __LINK_STATE_PRESENT, 329 __LINK_STATE_NOCARRIER, 330 __LINK_STATE_LINKWATCH_PENDING, 331 __LINK_STATE_DORMANT, 332 }; 333 334 335 /* 336 * This structure holds at boot time configured netdevice settings. They 337 * are then used in the device probing. 338 */ 339 struct netdev_boot_setup { 340 char name[IFNAMSIZ]; 341 struct ifmap map; 342 }; 343 #define NETDEV_BOOT_SETUP_MAX 8 344 345 extern int __init netdev_boot_setup(char *str); 346 347 /* 348 * Structure for NAPI scheduling similar to tasklet but with weighting 349 */ 350 struct napi_struct { 351 /* The poll_list must only be managed by the entity which 352 * changes the state of the NAPI_STATE_SCHED bit. This means 353 * whoever atomically sets that bit can add this napi_struct 354 * to the per-cpu poll_list, and whoever clears that bit 355 * can remove from the list right before clearing the bit. 356 */ 357 struct list_head poll_list; 358 359 unsigned long state; 360 int weight; 361 int (*poll)(struct napi_struct *, int); 362 #ifdef CONFIG_NETPOLL 363 spinlock_t poll_lock; 364 int poll_owner; 365 #endif 366 367 unsigned int gro_count; 368 369 struct net_device *dev; 370 struct list_head dev_list; 371 struct sk_buff *gro_list; 372 struct sk_buff *skb; 373 }; 374 375 enum { 376 NAPI_STATE_SCHED, /* Poll is scheduled */ 377 NAPI_STATE_DISABLE, /* Disable pending */ 378 NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */ 379 }; 380 381 enum gro_result { 382 GRO_MERGED, 383 GRO_MERGED_FREE, 384 GRO_HELD, 385 GRO_NORMAL, 386 GRO_DROP, 387 }; 388 typedef enum gro_result gro_result_t; 389 390 typedef struct sk_buff *rx_handler_func_t(struct sk_buff *skb); 391 392 extern void __napi_schedule(struct napi_struct *n); 393 394 static inline int napi_disable_pending(struct napi_struct *n) 395 { 396 return test_bit(NAPI_STATE_DISABLE, &n->state); 397 } 398 399 /** 400 * napi_schedule_prep - check if napi can be scheduled 401 * @n: napi context 402 * 403 * Test if NAPI routine is already running, and if not mark 404 * it as running. This is used as a condition variable 405 * insure only one NAPI poll instance runs. We also make 406 * sure there is no pending NAPI disable. 407 */ 408 static inline int napi_schedule_prep(struct napi_struct *n) 409 { 410 return !napi_disable_pending(n) && 411 !test_and_set_bit(NAPI_STATE_SCHED, &n->state); 412 } 413 414 /** 415 * napi_schedule - schedule NAPI poll 416 * @n: napi context 417 * 418 * Schedule NAPI poll routine to be called if it is not already 419 * running. 420 */ 421 static inline void napi_schedule(struct napi_struct *n) 422 { 423 if (napi_schedule_prep(n)) 424 __napi_schedule(n); 425 } 426 427 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */ 428 static inline int napi_reschedule(struct napi_struct *napi) 429 { 430 if (napi_schedule_prep(napi)) { 431 __napi_schedule(napi); 432 return 1; 433 } 434 return 0; 435 } 436 437 /** 438 * napi_complete - NAPI processing complete 439 * @n: napi context 440 * 441 * Mark NAPI processing as complete. 442 */ 443 extern void __napi_complete(struct napi_struct *n); 444 extern void napi_complete(struct napi_struct *n); 445 446 /** 447 * napi_disable - prevent NAPI from scheduling 448 * @n: napi context 449 * 450 * Stop NAPI from being scheduled on this context. 451 * Waits till any outstanding processing completes. 452 */ 453 static inline void napi_disable(struct napi_struct *n) 454 { 455 set_bit(NAPI_STATE_DISABLE, &n->state); 456 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state)) 457 msleep(1); 458 clear_bit(NAPI_STATE_DISABLE, &n->state); 459 } 460 461 /** 462 * napi_enable - enable NAPI scheduling 463 * @n: napi context 464 * 465 * Resume NAPI from being scheduled on this context. 466 * Must be paired with napi_disable. 467 */ 468 static inline void napi_enable(struct napi_struct *n) 469 { 470 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); 471 smp_mb__before_clear_bit(); 472 clear_bit(NAPI_STATE_SCHED, &n->state); 473 } 474 475 #ifdef CONFIG_SMP 476 /** 477 * napi_synchronize - wait until NAPI is not running 478 * @n: napi context 479 * 480 * Wait until NAPI is done being scheduled on this context. 481 * Waits till any outstanding processing completes but 482 * does not disable future activations. 483 */ 484 static inline void napi_synchronize(const struct napi_struct *n) 485 { 486 while (test_bit(NAPI_STATE_SCHED, &n->state)) 487 msleep(1); 488 } 489 #else 490 # define napi_synchronize(n) barrier() 491 #endif 492 493 enum netdev_queue_state_t { 494 __QUEUE_STATE_XOFF, 495 __QUEUE_STATE_FROZEN, 496 }; 497 498 struct netdev_queue { 499 /* 500 * read mostly part 501 */ 502 struct net_device *dev; 503 struct Qdisc *qdisc; 504 unsigned long state; 505 struct Qdisc *qdisc_sleeping; 506 /* 507 * write mostly part 508 */ 509 spinlock_t _xmit_lock ____cacheline_aligned_in_smp; 510 int xmit_lock_owner; 511 /* 512 * please use this field instead of dev->trans_start 513 */ 514 unsigned long trans_start; 515 u64 tx_bytes; 516 u64 tx_packets; 517 u64 tx_dropped; 518 } ____cacheline_aligned_in_smp; 519 520 #ifdef CONFIG_RPS 521 /* 522 * This structure holds an RPS map which can be of variable length. The 523 * map is an array of CPUs. 524 */ 525 struct rps_map { 526 unsigned int len; 527 struct rcu_head rcu; 528 u16 cpus[0]; 529 }; 530 #define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + (_num * sizeof(u16))) 531 532 /* 533 * The rps_dev_flow structure contains the mapping of a flow to a CPU and the 534 * tail pointer for that CPU's input queue at the time of last enqueue. 535 */ 536 struct rps_dev_flow { 537 u16 cpu; 538 u16 fill; 539 unsigned int last_qtail; 540 }; 541 542 /* 543 * The rps_dev_flow_table structure contains a table of flow mappings. 544 */ 545 struct rps_dev_flow_table { 546 unsigned int mask; 547 struct rcu_head rcu; 548 struct work_struct free_work; 549 struct rps_dev_flow flows[0]; 550 }; 551 #define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \ 552 (_num * sizeof(struct rps_dev_flow))) 553 554 /* 555 * The rps_sock_flow_table contains mappings of flows to the last CPU 556 * on which they were processed by the application (set in recvmsg). 557 */ 558 struct rps_sock_flow_table { 559 unsigned int mask; 560 u16 ents[0]; 561 }; 562 #define RPS_SOCK_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_sock_flow_table) + \ 563 (_num * sizeof(u16))) 564 565 #define RPS_NO_CPU 0xffff 566 567 static inline void rps_record_sock_flow(struct rps_sock_flow_table *table, 568 u32 hash) 569 { 570 if (table && hash) { 571 unsigned int cpu, index = hash & table->mask; 572 573 /* We only give a hint, preemption can change cpu under us */ 574 cpu = raw_smp_processor_id(); 575 576 if (table->ents[index] != cpu) 577 table->ents[index] = cpu; 578 } 579 } 580 581 static inline void rps_reset_sock_flow(struct rps_sock_flow_table *table, 582 u32 hash) 583 { 584 if (table && hash) 585 table->ents[hash & table->mask] = RPS_NO_CPU; 586 } 587 588 extern struct rps_sock_flow_table __rcu *rps_sock_flow_table; 589 590 /* This structure contains an instance of an RX queue. */ 591 struct netdev_rx_queue { 592 struct rps_map __rcu *rps_map; 593 struct rps_dev_flow_table __rcu *rps_flow_table; 594 struct kobject kobj; 595 struct netdev_rx_queue *first; 596 atomic_t count; 597 } ____cacheline_aligned_in_smp; 598 #endif /* CONFIG_RPS */ 599 600 /* 601 * This structure defines the management hooks for network devices. 602 * The following hooks can be defined; unless noted otherwise, they are 603 * optional and can be filled with a null pointer. 604 * 605 * int (*ndo_init)(struct net_device *dev); 606 * This function is called once when network device is registered. 607 * The network device can use this to any late stage initializaton 608 * or semantic validattion. It can fail with an error code which will 609 * be propogated back to register_netdev 610 * 611 * void (*ndo_uninit)(struct net_device *dev); 612 * This function is called when device is unregistered or when registration 613 * fails. It is not called if init fails. 614 * 615 * int (*ndo_open)(struct net_device *dev); 616 * This function is called when network device transistions to the up 617 * state. 618 * 619 * int (*ndo_stop)(struct net_device *dev); 620 * This function is called when network device transistions to the down 621 * state. 622 * 623 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb, 624 * struct net_device *dev); 625 * Called when a packet needs to be transmitted. 626 * Must return NETDEV_TX_OK , NETDEV_TX_BUSY. 627 * (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX) 628 * Required can not be NULL. 629 * 630 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb); 631 * Called to decide which queue to when device supports multiple 632 * transmit queues. 633 * 634 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags); 635 * This function is called to allow device receiver to make 636 * changes to configuration when multicast or promiscious is enabled. 637 * 638 * void (*ndo_set_rx_mode)(struct net_device *dev); 639 * This function is called device changes address list filtering. 640 * 641 * void (*ndo_set_multicast_list)(struct net_device *dev); 642 * This function is called when the multicast address list changes. 643 * 644 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr); 645 * This function is called when the Media Access Control address 646 * needs to be changed. If this interface is not defined, the 647 * mac address can not be changed. 648 * 649 * int (*ndo_validate_addr)(struct net_device *dev); 650 * Test if Media Access Control address is valid for the device. 651 * 652 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd); 653 * Called when a user request an ioctl which can't be handled by 654 * the generic interface code. If not defined ioctl's return 655 * not supported error code. 656 * 657 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map); 658 * Used to set network devices bus interface parameters. This interface 659 * is retained for legacy reason, new devices should use the bus 660 * interface (PCI) for low level management. 661 * 662 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu); 663 * Called when a user wants to change the Maximum Transfer Unit 664 * of a device. If not defined, any request to change MTU will 665 * will return an error. 666 * 667 * void (*ndo_tx_timeout)(struct net_device *dev); 668 * Callback uses when the transmitter has not made any progress 669 * for dev->watchdog ticks. 670 * 671 * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev, 672 * struct rtnl_link_stats64 *storage); 673 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev); 674 * Called when a user wants to get the network device usage 675 * statistics. Drivers must do one of the following: 676 * 1. Define @ndo_get_stats64 to fill in a zero-initialised 677 * rtnl_link_stats64 structure passed by the caller. 678 * 2. Define @ndo_get_stats to update a net_device_stats structure 679 * (which should normally be dev->stats) and return a pointer to 680 * it. The structure may be changed asynchronously only if each 681 * field is written atomically. 682 * 3. Update dev->stats asynchronously and atomically, and define 683 * neither operation. 684 * 685 * void (*ndo_vlan_rx_register)(struct net_device *dev, struct vlan_group *grp); 686 * If device support VLAN receive accleration 687 * (ie. dev->features & NETIF_F_HW_VLAN_RX), then this function is called 688 * when vlan groups for the device changes. Note: grp is NULL 689 * if no vlan's groups are being used. 690 * 691 * void (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid); 692 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER) 693 * this function is called when a VLAN id is registered. 694 * 695 * void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid); 696 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER) 697 * this function is called when a VLAN id is unregistered. 698 * 699 * void (*ndo_poll_controller)(struct net_device *dev); 700 * 701 * SR-IOV management functions. 702 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac); 703 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos); 704 * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate); 705 * int (*ndo_get_vf_config)(struct net_device *dev, 706 * int vf, struct ifla_vf_info *ivf); 707 * int (*ndo_set_vf_port)(struct net_device *dev, int vf, 708 * struct nlattr *port[]); 709 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb); 710 */ 711 #define HAVE_NET_DEVICE_OPS 712 struct net_device_ops { 713 int (*ndo_init)(struct net_device *dev); 714 void (*ndo_uninit)(struct net_device *dev); 715 int (*ndo_open)(struct net_device *dev); 716 int (*ndo_stop)(struct net_device *dev); 717 netdev_tx_t (*ndo_start_xmit) (struct sk_buff *skb, 718 struct net_device *dev); 719 u16 (*ndo_select_queue)(struct net_device *dev, 720 struct sk_buff *skb); 721 void (*ndo_change_rx_flags)(struct net_device *dev, 722 int flags); 723 void (*ndo_set_rx_mode)(struct net_device *dev); 724 void (*ndo_set_multicast_list)(struct net_device *dev); 725 int (*ndo_set_mac_address)(struct net_device *dev, 726 void *addr); 727 int (*ndo_validate_addr)(struct net_device *dev); 728 int (*ndo_do_ioctl)(struct net_device *dev, 729 struct ifreq *ifr, int cmd); 730 int (*ndo_set_config)(struct net_device *dev, 731 struct ifmap *map); 732 int (*ndo_change_mtu)(struct net_device *dev, 733 int new_mtu); 734 int (*ndo_neigh_setup)(struct net_device *dev, 735 struct neigh_parms *); 736 void (*ndo_tx_timeout) (struct net_device *dev); 737 738 struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev, 739 struct rtnl_link_stats64 *storage); 740 struct net_device_stats* (*ndo_get_stats)(struct net_device *dev); 741 742 void (*ndo_vlan_rx_register)(struct net_device *dev, 743 struct vlan_group *grp); 744 void (*ndo_vlan_rx_add_vid)(struct net_device *dev, 745 unsigned short vid); 746 void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, 747 unsigned short vid); 748 #ifdef CONFIG_NET_POLL_CONTROLLER 749 void (*ndo_poll_controller)(struct net_device *dev); 750 int (*ndo_netpoll_setup)(struct net_device *dev, 751 struct netpoll_info *info); 752 void (*ndo_netpoll_cleanup)(struct net_device *dev); 753 #endif 754 int (*ndo_set_vf_mac)(struct net_device *dev, 755 int queue, u8 *mac); 756 int (*ndo_set_vf_vlan)(struct net_device *dev, 757 int queue, u16 vlan, u8 qos); 758 int (*ndo_set_vf_tx_rate)(struct net_device *dev, 759 int vf, int rate); 760 int (*ndo_get_vf_config)(struct net_device *dev, 761 int vf, 762 struct ifla_vf_info *ivf); 763 int (*ndo_set_vf_port)(struct net_device *dev, 764 int vf, 765 struct nlattr *port[]); 766 int (*ndo_get_vf_port)(struct net_device *dev, 767 int vf, struct sk_buff *skb); 768 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 769 int (*ndo_fcoe_enable)(struct net_device *dev); 770 int (*ndo_fcoe_disable)(struct net_device *dev); 771 int (*ndo_fcoe_ddp_setup)(struct net_device *dev, 772 u16 xid, 773 struct scatterlist *sgl, 774 unsigned int sgc); 775 int (*ndo_fcoe_ddp_done)(struct net_device *dev, 776 u16 xid); 777 #define NETDEV_FCOE_WWNN 0 778 #define NETDEV_FCOE_WWPN 1 779 int (*ndo_fcoe_get_wwn)(struct net_device *dev, 780 u64 *wwn, int type); 781 #endif 782 }; 783 784 /* 785 * The DEVICE structure. 786 * Actually, this whole structure is a big mistake. It mixes I/O 787 * data with strictly "high-level" data, and it has to know about 788 * almost every data structure used in the INET module. 789 * 790 * FIXME: cleanup struct net_device such that network protocol info 791 * moves out. 792 */ 793 794 struct net_device { 795 796 /* 797 * This is the first field of the "visible" part of this structure 798 * (i.e. as seen by users in the "Space.c" file). It is the name 799 * of the interface. 800 */ 801 char name[IFNAMSIZ]; 802 803 struct pm_qos_request_list pm_qos_req; 804 805 /* device name hash chain */ 806 struct hlist_node name_hlist; 807 /* snmp alias */ 808 char *ifalias; 809 810 /* 811 * I/O specific fields 812 * FIXME: Merge these and struct ifmap into one 813 */ 814 unsigned long mem_end; /* shared mem end */ 815 unsigned long mem_start; /* shared mem start */ 816 unsigned long base_addr; /* device I/O address */ 817 unsigned int irq; /* device IRQ number */ 818 819 /* 820 * Some hardware also needs these fields, but they are not 821 * part of the usual set specified in Space.c. 822 */ 823 824 unsigned char if_port; /* Selectable AUI, TP,..*/ 825 unsigned char dma; /* DMA channel */ 826 827 unsigned long state; 828 829 struct list_head dev_list; 830 struct list_head napi_list; 831 struct list_head unreg_list; 832 833 /* Net device features */ 834 unsigned long features; 835 #define NETIF_F_SG 1 /* Scatter/gather IO. */ 836 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */ 837 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ 838 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ 839 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */ 840 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ 841 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ 842 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ 843 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ 844 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ 845 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ 846 #define NETIF_F_GSO 2048 /* Enable software GSO. */ 847 #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */ 848 /* do not use LLTX in new drivers */ 849 #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */ 850 #define NETIF_F_GRO 16384 /* Generic receive offload */ 851 #define NETIF_F_LRO 32768 /* large receive offload */ 852 853 /* the GSO_MASK reserves bits 16 through 23 */ 854 #define NETIF_F_FCOE_CRC (1 << 24) /* FCoE CRC32 */ 855 #define NETIF_F_SCTP_CSUM (1 << 25) /* SCTP checksum offload */ 856 #define NETIF_F_FCOE_MTU (1 << 26) /* Supports max FCoE MTU, 2158 bytes*/ 857 #define NETIF_F_NTUPLE (1 << 27) /* N-tuple filters supported */ 858 #define NETIF_F_RXHASH (1 << 28) /* Receive hashing offload */ 859 860 /* Segmentation offload features */ 861 #define NETIF_F_GSO_SHIFT 16 862 #define NETIF_F_GSO_MASK 0x00ff0000 863 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT) 864 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT) 865 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT) 866 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT) 867 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT) 868 #define NETIF_F_FSO (SKB_GSO_FCOE << NETIF_F_GSO_SHIFT) 869 870 /* List of features with software fallbacks. */ 871 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | \ 872 NETIF_F_TSO6 | NETIF_F_UFO) 873 874 875 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM) 876 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM) 877 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM) 878 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM) 879 880 /* 881 * If one device supports one of these features, then enable them 882 * for all in netdev_increment_features. 883 */ 884 #define NETIF_F_ONE_FOR_ALL (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \ 885 NETIF_F_SG | NETIF_F_HIGHDMA | \ 886 NETIF_F_FRAGLIST) 887 888 /* Interface index. Unique device identifier */ 889 int ifindex; 890 int iflink; 891 892 struct net_device_stats stats; 893 atomic_long_t rx_dropped; /* dropped packets by core network 894 * Do not use this in drivers. 895 */ 896 897 #ifdef CONFIG_WIRELESS_EXT 898 /* List of functions to handle Wireless Extensions (instead of ioctl). 899 * See <net/iw_handler.h> for details. Jean II */ 900 const struct iw_handler_def * wireless_handlers; 901 /* Instance data managed by the core of Wireless Extensions. */ 902 struct iw_public_data * wireless_data; 903 #endif 904 /* Management operations */ 905 const struct net_device_ops *netdev_ops; 906 const struct ethtool_ops *ethtool_ops; 907 908 /* Hardware header description */ 909 const struct header_ops *header_ops; 910 911 unsigned int flags; /* interface flags (a la BSD) */ 912 unsigned short gflags; 913 unsigned int priv_flags; /* Like 'flags' but invisible to userspace. */ 914 unsigned short padded; /* How much padding added by alloc_netdev() */ 915 916 unsigned char operstate; /* RFC2863 operstate */ 917 unsigned char link_mode; /* mapping policy to operstate */ 918 919 unsigned int mtu; /* interface MTU value */ 920 unsigned short type; /* interface hardware type */ 921 unsigned short hard_header_len; /* hardware hdr length */ 922 923 /* extra head- and tailroom the hardware may need, but not in all cases 924 * can this be guaranteed, especially tailroom. Some cases also use 925 * LL_MAX_HEADER instead to allocate the skb. 926 */ 927 unsigned short needed_headroom; 928 unsigned short needed_tailroom; 929 930 /* Interface address info. */ 931 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ 932 unsigned char addr_assign_type; /* hw address assignment type */ 933 unsigned char addr_len; /* hardware address length */ 934 unsigned short dev_id; /* for shared network cards */ 935 936 spinlock_t addr_list_lock; 937 struct netdev_hw_addr_list uc; /* Unicast mac addresses */ 938 struct netdev_hw_addr_list mc; /* Multicast mac addresses */ 939 int uc_promisc; 940 unsigned int promiscuity; 941 unsigned int allmulti; 942 943 944 /* Protocol specific pointers */ 945 946 #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) 947 struct vlan_group __rcu *vlgrp; /* VLAN group */ 948 #endif 949 #ifdef CONFIG_NET_DSA 950 void *dsa_ptr; /* dsa specific data */ 951 #endif 952 void *atalk_ptr; /* AppleTalk link */ 953 struct in_device __rcu *ip_ptr; /* IPv4 specific data */ 954 void *dn_ptr; /* DECnet specific data */ 955 struct inet6_dev __rcu *ip6_ptr; /* IPv6 specific data */ 956 void *ec_ptr; /* Econet specific data */ 957 void *ax25_ptr; /* AX.25 specific data */ 958 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data, 959 assign before registering */ 960 961 /* 962 * Cache lines mostly used on receive path (including eth_type_trans()) 963 */ 964 unsigned long last_rx; /* Time of last Rx 965 * This should not be set in 966 * drivers, unless really needed, 967 * because network stack (bonding) 968 * use it if/when necessary, to 969 * avoid dirtying this cache line. 970 */ 971 972 struct net_device *master; /* Pointer to master device of a group, 973 * which this device is member of. 974 */ 975 976 /* Interface address info used in eth_type_trans() */ 977 unsigned char *dev_addr; /* hw address, (before bcast 978 because most packets are 979 unicast) */ 980 981 struct netdev_hw_addr_list dev_addrs; /* list of device 982 hw addresses */ 983 984 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 985 986 #ifdef CONFIG_RPS 987 struct kset *queues_kset; 988 989 struct netdev_rx_queue *_rx; 990 991 /* Number of RX queues allocated at register_netdev() time */ 992 unsigned int num_rx_queues; 993 994 /* Number of RX queues currently active in device */ 995 unsigned int real_num_rx_queues; 996 #endif 997 998 rx_handler_func_t *rx_handler; 999 void *rx_handler_data; 1000 1001 struct netdev_queue __rcu *ingress_queue; 1002 1003 /* 1004 * Cache lines mostly used on transmit path 1005 */ 1006 struct netdev_queue *_tx ____cacheline_aligned_in_smp; 1007 1008 /* Number of TX queues allocated at alloc_netdev_mq() time */ 1009 unsigned int num_tx_queues; 1010 1011 /* Number of TX queues currently active in device */ 1012 unsigned int real_num_tx_queues; 1013 1014 /* root qdisc from userspace point of view */ 1015 struct Qdisc *qdisc; 1016 1017 unsigned long tx_queue_len; /* Max frames per queue allowed */ 1018 spinlock_t tx_global_lock; 1019 1020 /* These may be needed for future network-power-down code. */ 1021 1022 /* 1023 * trans_start here is expensive for high speed devices on SMP, 1024 * please use netdev_queue->trans_start instead. 1025 */ 1026 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 1027 1028 int watchdog_timeo; /* used by dev_watchdog() */ 1029 struct timer_list watchdog_timer; 1030 1031 /* Number of references to this device */ 1032 int __percpu *pcpu_refcnt; 1033 1034 /* delayed register/unregister */ 1035 struct list_head todo_list; 1036 /* device index hash chain */ 1037 struct hlist_node index_hlist; 1038 1039 struct list_head link_watch_list; 1040 1041 /* register/unregister state machine */ 1042 enum { NETREG_UNINITIALIZED=0, 1043 NETREG_REGISTERED, /* completed register_netdevice */ 1044 NETREG_UNREGISTERING, /* called unregister_netdevice */ 1045 NETREG_UNREGISTERED, /* completed unregister todo */ 1046 NETREG_RELEASED, /* called free_netdev */ 1047 NETREG_DUMMY, /* dummy device for NAPI poll */ 1048 } reg_state:16; 1049 1050 enum { 1051 RTNL_LINK_INITIALIZED, 1052 RTNL_LINK_INITIALIZING, 1053 } rtnl_link_state:16; 1054 1055 /* Called from unregister, can be used to call free_netdev */ 1056 void (*destructor)(struct net_device *dev); 1057 1058 #ifdef CONFIG_NETPOLL 1059 struct netpoll_info *npinfo; 1060 #endif 1061 1062 #ifdef CONFIG_NET_NS 1063 /* Network namespace this network device is inside */ 1064 struct net *nd_net; 1065 #endif 1066 1067 /* mid-layer private */ 1068 union { 1069 void *ml_priv; 1070 struct pcpu_lstats __percpu *lstats; /* loopback stats */ 1071 struct pcpu_tstats __percpu *tstats; /* tunnel stats */ 1072 struct pcpu_dstats __percpu *dstats; /* dummy stats */ 1073 }; 1074 /* GARP */ 1075 struct garp_port __rcu *garp_port; 1076 1077 /* class/net/name entry */ 1078 struct device dev; 1079 /* space for optional device, statistics, and wireless sysfs groups */ 1080 const struct attribute_group *sysfs_groups[4]; 1081 1082 /* rtnetlink link ops */ 1083 const struct rtnl_link_ops *rtnl_link_ops; 1084 1085 /* VLAN feature mask */ 1086 unsigned long vlan_features; 1087 1088 /* for setting kernel sock attribute on TCP connection setup */ 1089 #define GSO_MAX_SIZE 65536 1090 unsigned int gso_max_size; 1091 1092 #ifdef CONFIG_DCB 1093 /* Data Center Bridging netlink ops */ 1094 const struct dcbnl_rtnl_ops *dcbnl_ops; 1095 #endif 1096 1097 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 1098 /* max exchange id for FCoE LRO by ddp */ 1099 unsigned int fcoe_ddp_xid; 1100 #endif 1101 /* n-tuple filter list attached to this device */ 1102 struct ethtool_rx_ntuple_list ethtool_ntuple_list; 1103 1104 /* phy device may attach itself for hardware timestamping */ 1105 struct phy_device *phydev; 1106 }; 1107 #define to_net_dev(d) container_of(d, struct net_device, dev) 1108 1109 #define NETDEV_ALIGN 32 1110 1111 static inline 1112 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev, 1113 unsigned int index) 1114 { 1115 return &dev->_tx[index]; 1116 } 1117 1118 static inline void netdev_for_each_tx_queue(struct net_device *dev, 1119 void (*f)(struct net_device *, 1120 struct netdev_queue *, 1121 void *), 1122 void *arg) 1123 { 1124 unsigned int i; 1125 1126 for (i = 0; i < dev->num_tx_queues; i++) 1127 f(dev, &dev->_tx[i], arg); 1128 } 1129 1130 /* 1131 * Net namespace inlines 1132 */ 1133 static inline 1134 struct net *dev_net(const struct net_device *dev) 1135 { 1136 return read_pnet(&dev->nd_net); 1137 } 1138 1139 static inline 1140 void dev_net_set(struct net_device *dev, struct net *net) 1141 { 1142 #ifdef CONFIG_NET_NS 1143 release_net(dev->nd_net); 1144 dev->nd_net = hold_net(net); 1145 #endif 1146 } 1147 1148 static inline bool netdev_uses_dsa_tags(struct net_device *dev) 1149 { 1150 #ifdef CONFIG_NET_DSA_TAG_DSA 1151 if (dev->dsa_ptr != NULL) 1152 return dsa_uses_dsa_tags(dev->dsa_ptr); 1153 #endif 1154 1155 return 0; 1156 } 1157 1158 #ifndef CONFIG_NET_NS 1159 static inline void skb_set_dev(struct sk_buff *skb, struct net_device *dev) 1160 { 1161 skb->dev = dev; 1162 } 1163 #else /* CONFIG_NET_NS */ 1164 void skb_set_dev(struct sk_buff *skb, struct net_device *dev); 1165 #endif 1166 1167 static inline bool netdev_uses_trailer_tags(struct net_device *dev) 1168 { 1169 #ifdef CONFIG_NET_DSA_TAG_TRAILER 1170 if (dev->dsa_ptr != NULL) 1171 return dsa_uses_trailer_tags(dev->dsa_ptr); 1172 #endif 1173 1174 return 0; 1175 } 1176 1177 /** 1178 * netdev_priv - access network device private data 1179 * @dev: network device 1180 * 1181 * Get network device private data 1182 */ 1183 static inline void *netdev_priv(const struct net_device *dev) 1184 { 1185 return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN); 1186 } 1187 1188 /* Set the sysfs physical device reference for the network logical device 1189 * if set prior to registration will cause a symlink during initialization. 1190 */ 1191 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) 1192 1193 /* Set the sysfs device type for the network logical device to allow 1194 * fin grained indentification of different network device types. For 1195 * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc. 1196 */ 1197 #define SET_NETDEV_DEVTYPE(net, devtype) ((net)->dev.type = (devtype)) 1198 1199 /** 1200 * netif_napi_add - initialize a napi context 1201 * @dev: network device 1202 * @napi: napi context 1203 * @poll: polling function 1204 * @weight: default weight 1205 * 1206 * netif_napi_add() must be used to initialize a napi context prior to calling 1207 * *any* of the other napi related functions. 1208 */ 1209 void netif_napi_add(struct net_device *dev, struct napi_struct *napi, 1210 int (*poll)(struct napi_struct *, int), int weight); 1211 1212 /** 1213 * netif_napi_del - remove a napi context 1214 * @napi: napi context 1215 * 1216 * netif_napi_del() removes a napi context from the network device napi list 1217 */ 1218 void netif_napi_del(struct napi_struct *napi); 1219 1220 struct napi_gro_cb { 1221 /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */ 1222 void *frag0; 1223 1224 /* Length of frag0. */ 1225 unsigned int frag0_len; 1226 1227 /* This indicates where we are processing relative to skb->data. */ 1228 int data_offset; 1229 1230 /* This is non-zero if the packet may be of the same flow. */ 1231 int same_flow; 1232 1233 /* This is non-zero if the packet cannot be merged with the new skb. */ 1234 int flush; 1235 1236 /* Number of segments aggregated. */ 1237 int count; 1238 1239 /* Free the skb? */ 1240 int free; 1241 }; 1242 1243 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb) 1244 1245 struct packet_type { 1246 __be16 type; /* This is really htons(ether_type). */ 1247 struct net_device *dev; /* NULL is wildcarded here */ 1248 int (*func) (struct sk_buff *, 1249 struct net_device *, 1250 struct packet_type *, 1251 struct net_device *); 1252 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 1253 int features); 1254 int (*gso_send_check)(struct sk_buff *skb); 1255 struct sk_buff **(*gro_receive)(struct sk_buff **head, 1256 struct sk_buff *skb); 1257 int (*gro_complete)(struct sk_buff *skb); 1258 void *af_packet_priv; 1259 struct list_head list; 1260 }; 1261 1262 #include <linux/interrupt.h> 1263 #include <linux/notifier.h> 1264 1265 extern rwlock_t dev_base_lock; /* Device list lock */ 1266 1267 1268 #define for_each_netdev(net, d) \ 1269 list_for_each_entry(d, &(net)->dev_base_head, dev_list) 1270 #define for_each_netdev_reverse(net, d) \ 1271 list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list) 1272 #define for_each_netdev_rcu(net, d) \ 1273 list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list) 1274 #define for_each_netdev_safe(net, d, n) \ 1275 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list) 1276 #define for_each_netdev_continue(net, d) \ 1277 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list) 1278 #define for_each_netdev_continue_rcu(net, d) \ 1279 list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list) 1280 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) 1281 1282 static inline struct net_device *next_net_device(struct net_device *dev) 1283 { 1284 struct list_head *lh; 1285 struct net *net; 1286 1287 net = dev_net(dev); 1288 lh = dev->dev_list.next; 1289 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 1290 } 1291 1292 static inline struct net_device *next_net_device_rcu(struct net_device *dev) 1293 { 1294 struct list_head *lh; 1295 struct net *net; 1296 1297 net = dev_net(dev); 1298 lh = rcu_dereference(dev->dev_list.next); 1299 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 1300 } 1301 1302 static inline struct net_device *first_net_device(struct net *net) 1303 { 1304 return list_empty(&net->dev_base_head) ? NULL : 1305 net_device_entry(net->dev_base_head.next); 1306 } 1307 1308 extern int netdev_boot_setup_check(struct net_device *dev); 1309 extern unsigned long netdev_boot_base(const char *prefix, int unit); 1310 extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr); 1311 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type); 1312 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type); 1313 extern void dev_add_pack(struct packet_type *pt); 1314 extern void dev_remove_pack(struct packet_type *pt); 1315 extern void __dev_remove_pack(struct packet_type *pt); 1316 1317 extern struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short flags, 1318 unsigned short mask); 1319 extern struct net_device *dev_get_by_name(struct net *net, const char *name); 1320 extern struct net_device *dev_get_by_name_rcu(struct net *net, const char *name); 1321 extern struct net_device *__dev_get_by_name(struct net *net, const char *name); 1322 extern int dev_alloc_name(struct net_device *dev, const char *name); 1323 extern int dev_open(struct net_device *dev); 1324 extern int dev_close(struct net_device *dev); 1325 extern void dev_disable_lro(struct net_device *dev); 1326 extern int dev_queue_xmit(struct sk_buff *skb); 1327 extern int register_netdevice(struct net_device *dev); 1328 extern void unregister_netdevice_queue(struct net_device *dev, 1329 struct list_head *head); 1330 extern void unregister_netdevice_many(struct list_head *head); 1331 static inline void unregister_netdevice(struct net_device *dev) 1332 { 1333 unregister_netdevice_queue(dev, NULL); 1334 } 1335 1336 extern int netdev_refcnt_read(const struct net_device *dev); 1337 extern void free_netdev(struct net_device *dev); 1338 extern void synchronize_net(void); 1339 extern int register_netdevice_notifier(struct notifier_block *nb); 1340 extern int unregister_netdevice_notifier(struct notifier_block *nb); 1341 extern int init_dummy_netdev(struct net_device *dev); 1342 extern void netdev_resync_ops(struct net_device *dev); 1343 1344 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev); 1345 extern struct net_device *dev_get_by_index(struct net *net, int ifindex); 1346 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex); 1347 extern struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex); 1348 extern int dev_restart(struct net_device *dev); 1349 #ifdef CONFIG_NETPOLL_TRAP 1350 extern int netpoll_trap(void); 1351 #endif 1352 extern int skb_gro_receive(struct sk_buff **head, 1353 struct sk_buff *skb); 1354 extern void skb_gro_reset_offset(struct sk_buff *skb); 1355 1356 static inline unsigned int skb_gro_offset(const struct sk_buff *skb) 1357 { 1358 return NAPI_GRO_CB(skb)->data_offset; 1359 } 1360 1361 static inline unsigned int skb_gro_len(const struct sk_buff *skb) 1362 { 1363 return skb->len - NAPI_GRO_CB(skb)->data_offset; 1364 } 1365 1366 static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len) 1367 { 1368 NAPI_GRO_CB(skb)->data_offset += len; 1369 } 1370 1371 static inline void *skb_gro_header_fast(struct sk_buff *skb, 1372 unsigned int offset) 1373 { 1374 return NAPI_GRO_CB(skb)->frag0 + offset; 1375 } 1376 1377 static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen) 1378 { 1379 return NAPI_GRO_CB(skb)->frag0_len < hlen; 1380 } 1381 1382 static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen, 1383 unsigned int offset) 1384 { 1385 NAPI_GRO_CB(skb)->frag0 = NULL; 1386 NAPI_GRO_CB(skb)->frag0_len = 0; 1387 return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL; 1388 } 1389 1390 static inline void *skb_gro_mac_header(struct sk_buff *skb) 1391 { 1392 return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb); 1393 } 1394 1395 static inline void *skb_gro_network_header(struct sk_buff *skb) 1396 { 1397 return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) + 1398 skb_network_offset(skb); 1399 } 1400 1401 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, 1402 unsigned short type, 1403 const void *daddr, const void *saddr, 1404 unsigned len) 1405 { 1406 if (!dev->header_ops || !dev->header_ops->create) 1407 return 0; 1408 1409 return dev->header_ops->create(skb, dev, type, daddr, saddr, len); 1410 } 1411 1412 static inline int dev_parse_header(const struct sk_buff *skb, 1413 unsigned char *haddr) 1414 { 1415 const struct net_device *dev = skb->dev; 1416 1417 if (!dev->header_ops || !dev->header_ops->parse) 1418 return 0; 1419 return dev->header_ops->parse(skb, haddr); 1420 } 1421 1422 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 1423 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 1424 static inline int unregister_gifconf(unsigned int family) 1425 { 1426 return register_gifconf(family, NULL); 1427 } 1428 1429 /* 1430 * Incoming packets are placed on per-cpu queues 1431 */ 1432 struct softnet_data { 1433 struct Qdisc *output_queue; 1434 struct Qdisc **output_queue_tailp; 1435 struct list_head poll_list; 1436 struct sk_buff *completion_queue; 1437 struct sk_buff_head process_queue; 1438 1439 /* stats */ 1440 unsigned int processed; 1441 unsigned int time_squeeze; 1442 unsigned int cpu_collision; 1443 unsigned int received_rps; 1444 1445 #ifdef CONFIG_RPS 1446 struct softnet_data *rps_ipi_list; 1447 1448 /* Elements below can be accessed between CPUs for RPS */ 1449 struct call_single_data csd ____cacheline_aligned_in_smp; 1450 struct softnet_data *rps_ipi_next; 1451 unsigned int cpu; 1452 unsigned int input_queue_head; 1453 unsigned int input_queue_tail; 1454 #endif 1455 unsigned dropped; 1456 struct sk_buff_head input_pkt_queue; 1457 struct napi_struct backlog; 1458 }; 1459 1460 static inline void input_queue_head_incr(struct softnet_data *sd) 1461 { 1462 #ifdef CONFIG_RPS 1463 sd->input_queue_head++; 1464 #endif 1465 } 1466 1467 static inline void input_queue_tail_incr_save(struct softnet_data *sd, 1468 unsigned int *qtail) 1469 { 1470 #ifdef CONFIG_RPS 1471 *qtail = ++sd->input_queue_tail; 1472 #endif 1473 } 1474 1475 DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); 1476 1477 #define HAVE_NETIF_QUEUE 1478 1479 extern void __netif_schedule(struct Qdisc *q); 1480 1481 static inline void netif_schedule_queue(struct netdev_queue *txq) 1482 { 1483 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state)) 1484 __netif_schedule(txq->qdisc); 1485 } 1486 1487 static inline void netif_tx_schedule_all(struct net_device *dev) 1488 { 1489 unsigned int i; 1490 1491 for (i = 0; i < dev->num_tx_queues; i++) 1492 netif_schedule_queue(netdev_get_tx_queue(dev, i)); 1493 } 1494 1495 static inline void netif_tx_start_queue(struct netdev_queue *dev_queue) 1496 { 1497 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1498 } 1499 1500 /** 1501 * netif_start_queue - allow transmit 1502 * @dev: network device 1503 * 1504 * Allow upper layers to call the device hard_start_xmit routine. 1505 */ 1506 static inline void netif_start_queue(struct net_device *dev) 1507 { 1508 netif_tx_start_queue(netdev_get_tx_queue(dev, 0)); 1509 } 1510 1511 static inline void netif_tx_start_all_queues(struct net_device *dev) 1512 { 1513 unsigned int i; 1514 1515 for (i = 0; i < dev->num_tx_queues; i++) { 1516 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1517 netif_tx_start_queue(txq); 1518 } 1519 } 1520 1521 static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue) 1522 { 1523 #ifdef CONFIG_NETPOLL_TRAP 1524 if (netpoll_trap()) { 1525 netif_tx_start_queue(dev_queue); 1526 return; 1527 } 1528 #endif 1529 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state)) 1530 __netif_schedule(dev_queue->qdisc); 1531 } 1532 1533 /** 1534 * netif_wake_queue - restart transmit 1535 * @dev: network device 1536 * 1537 * Allow upper layers to call the device hard_start_xmit routine. 1538 * Used for flow control when transmit resources are available. 1539 */ 1540 static inline void netif_wake_queue(struct net_device *dev) 1541 { 1542 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0)); 1543 } 1544 1545 static inline void netif_tx_wake_all_queues(struct net_device *dev) 1546 { 1547 unsigned int i; 1548 1549 for (i = 0; i < dev->num_tx_queues; i++) { 1550 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1551 netif_tx_wake_queue(txq); 1552 } 1553 } 1554 1555 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue) 1556 { 1557 set_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1558 } 1559 1560 /** 1561 * netif_stop_queue - stop transmitted packets 1562 * @dev: network device 1563 * 1564 * Stop upper layers calling the device hard_start_xmit routine. 1565 * Used for flow control when transmit resources are unavailable. 1566 */ 1567 static inline void netif_stop_queue(struct net_device *dev) 1568 { 1569 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0)); 1570 } 1571 1572 static inline void netif_tx_stop_all_queues(struct net_device *dev) 1573 { 1574 unsigned int i; 1575 1576 for (i = 0; i < dev->num_tx_queues; i++) { 1577 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1578 netif_tx_stop_queue(txq); 1579 } 1580 } 1581 1582 static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue) 1583 { 1584 return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1585 } 1586 1587 /** 1588 * netif_queue_stopped - test if transmit queue is flowblocked 1589 * @dev: network device 1590 * 1591 * Test if transmit queue on device is currently unable to send. 1592 */ 1593 static inline int netif_queue_stopped(const struct net_device *dev) 1594 { 1595 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0)); 1596 } 1597 1598 static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue) 1599 { 1600 return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state); 1601 } 1602 1603 /** 1604 * netif_running - test if up 1605 * @dev: network device 1606 * 1607 * Test if the device has been brought up. 1608 */ 1609 static inline int netif_running(const struct net_device *dev) 1610 { 1611 return test_bit(__LINK_STATE_START, &dev->state); 1612 } 1613 1614 /* 1615 * Routines to manage the subqueues on a device. We only need start 1616 * stop, and a check if it's stopped. All other device management is 1617 * done at the overall netdevice level. 1618 * Also test the device if we're multiqueue. 1619 */ 1620 1621 /** 1622 * netif_start_subqueue - allow sending packets on subqueue 1623 * @dev: network device 1624 * @queue_index: sub queue index 1625 * 1626 * Start individual transmit queue of a device with multiple transmit queues. 1627 */ 1628 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 1629 { 1630 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1631 1632 netif_tx_start_queue(txq); 1633 } 1634 1635 /** 1636 * netif_stop_subqueue - stop sending packets on subqueue 1637 * @dev: network device 1638 * @queue_index: sub queue index 1639 * 1640 * Stop individual transmit queue of a device with multiple transmit queues. 1641 */ 1642 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 1643 { 1644 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1645 #ifdef CONFIG_NETPOLL_TRAP 1646 if (netpoll_trap()) 1647 return; 1648 #endif 1649 netif_tx_stop_queue(txq); 1650 } 1651 1652 /** 1653 * netif_subqueue_stopped - test status of subqueue 1654 * @dev: network device 1655 * @queue_index: sub queue index 1656 * 1657 * Check individual transmit queue of a device with multiple transmit queues. 1658 */ 1659 static inline int __netif_subqueue_stopped(const struct net_device *dev, 1660 u16 queue_index) 1661 { 1662 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1663 1664 return netif_tx_queue_stopped(txq); 1665 } 1666 1667 static inline int netif_subqueue_stopped(const struct net_device *dev, 1668 struct sk_buff *skb) 1669 { 1670 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb)); 1671 } 1672 1673 /** 1674 * netif_wake_subqueue - allow sending packets on subqueue 1675 * @dev: network device 1676 * @queue_index: sub queue index 1677 * 1678 * Resume individual transmit queue of a device with multiple transmit queues. 1679 */ 1680 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 1681 { 1682 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1683 #ifdef CONFIG_NETPOLL_TRAP 1684 if (netpoll_trap()) 1685 return; 1686 #endif 1687 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state)) 1688 __netif_schedule(txq->qdisc); 1689 } 1690 1691 /** 1692 * netif_is_multiqueue - test if device has multiple transmit queues 1693 * @dev: network device 1694 * 1695 * Check if device has multiple transmit queues 1696 */ 1697 static inline int netif_is_multiqueue(const struct net_device *dev) 1698 { 1699 return dev->num_tx_queues > 1; 1700 } 1701 1702 extern int netif_set_real_num_tx_queues(struct net_device *dev, 1703 unsigned int txq); 1704 1705 #ifdef CONFIG_RPS 1706 extern int netif_set_real_num_rx_queues(struct net_device *dev, 1707 unsigned int rxq); 1708 #else 1709 static inline int netif_set_real_num_rx_queues(struct net_device *dev, 1710 unsigned int rxq) 1711 { 1712 return 0; 1713 } 1714 #endif 1715 1716 static inline int netif_copy_real_num_queues(struct net_device *to_dev, 1717 const struct net_device *from_dev) 1718 { 1719 netif_set_real_num_tx_queues(to_dev, from_dev->real_num_tx_queues); 1720 #ifdef CONFIG_RPS 1721 return netif_set_real_num_rx_queues(to_dev, 1722 from_dev->real_num_rx_queues); 1723 #else 1724 return 0; 1725 #endif 1726 } 1727 1728 /* Use this variant when it is known for sure that it 1729 * is executing from hardware interrupt context or with hardware interrupts 1730 * disabled. 1731 */ 1732 extern void dev_kfree_skb_irq(struct sk_buff *skb); 1733 1734 /* Use this variant in places where it could be invoked 1735 * from either hardware interrupt or other context, with hardware interrupts 1736 * either disabled or enabled. 1737 */ 1738 extern void dev_kfree_skb_any(struct sk_buff *skb); 1739 1740 #define HAVE_NETIF_RX 1 1741 extern int netif_rx(struct sk_buff *skb); 1742 extern int netif_rx_ni(struct sk_buff *skb); 1743 #define HAVE_NETIF_RECEIVE_SKB 1 1744 extern int netif_receive_skb(struct sk_buff *skb); 1745 extern gro_result_t dev_gro_receive(struct napi_struct *napi, 1746 struct sk_buff *skb); 1747 extern gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb); 1748 extern gro_result_t napi_gro_receive(struct napi_struct *napi, 1749 struct sk_buff *skb); 1750 extern void napi_gro_flush(struct napi_struct *napi); 1751 extern struct sk_buff * napi_get_frags(struct napi_struct *napi); 1752 extern gro_result_t napi_frags_finish(struct napi_struct *napi, 1753 struct sk_buff *skb, 1754 gro_result_t ret); 1755 extern struct sk_buff * napi_frags_skb(struct napi_struct *napi); 1756 extern gro_result_t napi_gro_frags(struct napi_struct *napi); 1757 1758 static inline void napi_free_frags(struct napi_struct *napi) 1759 { 1760 kfree_skb(napi->skb); 1761 napi->skb = NULL; 1762 } 1763 1764 extern int netdev_rx_handler_register(struct net_device *dev, 1765 rx_handler_func_t *rx_handler, 1766 void *rx_handler_data); 1767 extern void netdev_rx_handler_unregister(struct net_device *dev); 1768 1769 extern int dev_valid_name(const char *name); 1770 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *); 1771 extern int dev_ethtool(struct net *net, struct ifreq *); 1772 extern unsigned dev_get_flags(const struct net_device *); 1773 extern int __dev_change_flags(struct net_device *, unsigned int flags); 1774 extern int dev_change_flags(struct net_device *, unsigned); 1775 extern void __dev_notify_flags(struct net_device *, unsigned int old_flags); 1776 extern int dev_change_name(struct net_device *, const char *); 1777 extern int dev_set_alias(struct net_device *, const char *, size_t); 1778 extern int dev_change_net_namespace(struct net_device *, 1779 struct net *, const char *); 1780 extern int dev_set_mtu(struct net_device *, int); 1781 extern int dev_set_mac_address(struct net_device *, 1782 struct sockaddr *); 1783 extern int dev_hard_start_xmit(struct sk_buff *skb, 1784 struct net_device *dev, 1785 struct netdev_queue *txq); 1786 extern int dev_forward_skb(struct net_device *dev, 1787 struct sk_buff *skb); 1788 1789 extern int netdev_budget; 1790 1791 /* Called by rtnetlink.c:rtnl_unlock() */ 1792 extern void netdev_run_todo(void); 1793 1794 /** 1795 * dev_put - release reference to device 1796 * @dev: network device 1797 * 1798 * Release reference to device to allow it to be freed. 1799 */ 1800 static inline void dev_put(struct net_device *dev) 1801 { 1802 irqsafe_cpu_dec(*dev->pcpu_refcnt); 1803 } 1804 1805 /** 1806 * dev_hold - get reference to device 1807 * @dev: network device 1808 * 1809 * Hold reference to device to keep it from being freed. 1810 */ 1811 static inline void dev_hold(struct net_device *dev) 1812 { 1813 irqsafe_cpu_inc(*dev->pcpu_refcnt); 1814 } 1815 1816 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 1817 * and _off may be called from IRQ context, but it is caller 1818 * who is responsible for serialization of these calls. 1819 * 1820 * The name carrier is inappropriate, these functions should really be 1821 * called netif_lowerlayer_*() because they represent the state of any 1822 * kind of lower layer not just hardware media. 1823 */ 1824 1825 extern void linkwatch_fire_event(struct net_device *dev); 1826 extern void linkwatch_forget_dev(struct net_device *dev); 1827 1828 /** 1829 * netif_carrier_ok - test if carrier present 1830 * @dev: network device 1831 * 1832 * Check if carrier is present on device 1833 */ 1834 static inline int netif_carrier_ok(const struct net_device *dev) 1835 { 1836 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 1837 } 1838 1839 extern unsigned long dev_trans_start(struct net_device *dev); 1840 1841 extern void __netdev_watchdog_up(struct net_device *dev); 1842 1843 extern void netif_carrier_on(struct net_device *dev); 1844 1845 extern void netif_carrier_off(struct net_device *dev); 1846 1847 extern void netif_notify_peers(struct net_device *dev); 1848 1849 /** 1850 * netif_dormant_on - mark device as dormant. 1851 * @dev: network device 1852 * 1853 * Mark device as dormant (as per RFC2863). 1854 * 1855 * The dormant state indicates that the relevant interface is not 1856 * actually in a condition to pass packets (i.e., it is not 'up') but is 1857 * in a "pending" state, waiting for some external event. For "on- 1858 * demand" interfaces, this new state identifies the situation where the 1859 * interface is waiting for events to place it in the up state. 1860 * 1861 */ 1862 static inline void netif_dormant_on(struct net_device *dev) 1863 { 1864 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 1865 linkwatch_fire_event(dev); 1866 } 1867 1868 /** 1869 * netif_dormant_off - set device as not dormant. 1870 * @dev: network device 1871 * 1872 * Device is not in dormant state. 1873 */ 1874 static inline void netif_dormant_off(struct net_device *dev) 1875 { 1876 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 1877 linkwatch_fire_event(dev); 1878 } 1879 1880 /** 1881 * netif_dormant - test if carrier present 1882 * @dev: network device 1883 * 1884 * Check if carrier is present on device 1885 */ 1886 static inline int netif_dormant(const struct net_device *dev) 1887 { 1888 return test_bit(__LINK_STATE_DORMANT, &dev->state); 1889 } 1890 1891 1892 /** 1893 * netif_oper_up - test if device is operational 1894 * @dev: network device 1895 * 1896 * Check if carrier is operational 1897 */ 1898 static inline int netif_oper_up(const struct net_device *dev) 1899 { 1900 return (dev->operstate == IF_OPER_UP || 1901 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 1902 } 1903 1904 /** 1905 * netif_device_present - is device available or removed 1906 * @dev: network device 1907 * 1908 * Check if device has not been removed from system. 1909 */ 1910 static inline int netif_device_present(struct net_device *dev) 1911 { 1912 return test_bit(__LINK_STATE_PRESENT, &dev->state); 1913 } 1914 1915 extern void netif_device_detach(struct net_device *dev); 1916 1917 extern void netif_device_attach(struct net_device *dev); 1918 1919 /* 1920 * Network interface message level settings 1921 */ 1922 #define HAVE_NETIF_MSG 1 1923 1924 enum { 1925 NETIF_MSG_DRV = 0x0001, 1926 NETIF_MSG_PROBE = 0x0002, 1927 NETIF_MSG_LINK = 0x0004, 1928 NETIF_MSG_TIMER = 0x0008, 1929 NETIF_MSG_IFDOWN = 0x0010, 1930 NETIF_MSG_IFUP = 0x0020, 1931 NETIF_MSG_RX_ERR = 0x0040, 1932 NETIF_MSG_TX_ERR = 0x0080, 1933 NETIF_MSG_TX_QUEUED = 0x0100, 1934 NETIF_MSG_INTR = 0x0200, 1935 NETIF_MSG_TX_DONE = 0x0400, 1936 NETIF_MSG_RX_STATUS = 0x0800, 1937 NETIF_MSG_PKTDATA = 0x1000, 1938 NETIF_MSG_HW = 0x2000, 1939 NETIF_MSG_WOL = 0x4000, 1940 }; 1941 1942 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 1943 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 1944 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 1945 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 1946 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 1947 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 1948 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 1949 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 1950 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 1951 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 1952 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 1953 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 1954 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 1955 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 1956 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 1957 1958 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 1959 { 1960 /* use default */ 1961 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 1962 return default_msg_enable_bits; 1963 if (debug_value == 0) /* no output */ 1964 return 0; 1965 /* set low N bits */ 1966 return (1 << debug_value) - 1; 1967 } 1968 1969 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu) 1970 { 1971 spin_lock(&txq->_xmit_lock); 1972 txq->xmit_lock_owner = cpu; 1973 } 1974 1975 static inline void __netif_tx_lock_bh(struct netdev_queue *txq) 1976 { 1977 spin_lock_bh(&txq->_xmit_lock); 1978 txq->xmit_lock_owner = smp_processor_id(); 1979 } 1980 1981 static inline int __netif_tx_trylock(struct netdev_queue *txq) 1982 { 1983 int ok = spin_trylock(&txq->_xmit_lock); 1984 if (likely(ok)) 1985 txq->xmit_lock_owner = smp_processor_id(); 1986 return ok; 1987 } 1988 1989 static inline void __netif_tx_unlock(struct netdev_queue *txq) 1990 { 1991 txq->xmit_lock_owner = -1; 1992 spin_unlock(&txq->_xmit_lock); 1993 } 1994 1995 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq) 1996 { 1997 txq->xmit_lock_owner = -1; 1998 spin_unlock_bh(&txq->_xmit_lock); 1999 } 2000 2001 static inline void txq_trans_update(struct netdev_queue *txq) 2002 { 2003 if (txq->xmit_lock_owner != -1) 2004 txq->trans_start = jiffies; 2005 } 2006 2007 /** 2008 * netif_tx_lock - grab network device transmit lock 2009 * @dev: network device 2010 * 2011 * Get network device transmit lock 2012 */ 2013 static inline void netif_tx_lock(struct net_device *dev) 2014 { 2015 unsigned int i; 2016 int cpu; 2017 2018 spin_lock(&dev->tx_global_lock); 2019 cpu = smp_processor_id(); 2020 for (i = 0; i < dev->num_tx_queues; i++) { 2021 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 2022 2023 /* We are the only thread of execution doing a 2024 * freeze, but we have to grab the _xmit_lock in 2025 * order to synchronize with threads which are in 2026 * the ->hard_start_xmit() handler and already 2027 * checked the frozen bit. 2028 */ 2029 __netif_tx_lock(txq, cpu); 2030 set_bit(__QUEUE_STATE_FROZEN, &txq->state); 2031 __netif_tx_unlock(txq); 2032 } 2033 } 2034 2035 static inline void netif_tx_lock_bh(struct net_device *dev) 2036 { 2037 local_bh_disable(); 2038 netif_tx_lock(dev); 2039 } 2040 2041 static inline void netif_tx_unlock(struct net_device *dev) 2042 { 2043 unsigned int i; 2044 2045 for (i = 0; i < dev->num_tx_queues; i++) { 2046 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 2047 2048 /* No need to grab the _xmit_lock here. If the 2049 * queue is not stopped for another reason, we 2050 * force a schedule. 2051 */ 2052 clear_bit(__QUEUE_STATE_FROZEN, &txq->state); 2053 netif_schedule_queue(txq); 2054 } 2055 spin_unlock(&dev->tx_global_lock); 2056 } 2057 2058 static inline void netif_tx_unlock_bh(struct net_device *dev) 2059 { 2060 netif_tx_unlock(dev); 2061 local_bh_enable(); 2062 } 2063 2064 #define HARD_TX_LOCK(dev, txq, cpu) { \ 2065 if ((dev->features & NETIF_F_LLTX) == 0) { \ 2066 __netif_tx_lock(txq, cpu); \ 2067 } \ 2068 } 2069 2070 #define HARD_TX_UNLOCK(dev, txq) { \ 2071 if ((dev->features & NETIF_F_LLTX) == 0) { \ 2072 __netif_tx_unlock(txq); \ 2073 } \ 2074 } 2075 2076 static inline void netif_tx_disable(struct net_device *dev) 2077 { 2078 unsigned int i; 2079 int cpu; 2080 2081 local_bh_disable(); 2082 cpu = smp_processor_id(); 2083 for (i = 0; i < dev->num_tx_queues; i++) { 2084 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 2085 2086 __netif_tx_lock(txq, cpu); 2087 netif_tx_stop_queue(txq); 2088 __netif_tx_unlock(txq); 2089 } 2090 local_bh_enable(); 2091 } 2092 2093 static inline void netif_addr_lock(struct net_device *dev) 2094 { 2095 spin_lock(&dev->addr_list_lock); 2096 } 2097 2098 static inline void netif_addr_lock_bh(struct net_device *dev) 2099 { 2100 spin_lock_bh(&dev->addr_list_lock); 2101 } 2102 2103 static inline void netif_addr_unlock(struct net_device *dev) 2104 { 2105 spin_unlock(&dev->addr_list_lock); 2106 } 2107 2108 static inline void netif_addr_unlock_bh(struct net_device *dev) 2109 { 2110 spin_unlock_bh(&dev->addr_list_lock); 2111 } 2112 2113 /* 2114 * dev_addrs walker. Should be used only for read access. Call with 2115 * rcu_read_lock held. 2116 */ 2117 #define for_each_dev_addr(dev, ha) \ 2118 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list) 2119 2120 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 2121 2122 extern void ether_setup(struct net_device *dev); 2123 2124 /* Support for loadable net-drivers */ 2125 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, 2126 void (*setup)(struct net_device *), 2127 unsigned int queue_count); 2128 #define alloc_netdev(sizeof_priv, name, setup) \ 2129 alloc_netdev_mq(sizeof_priv, name, setup, 1) 2130 extern int register_netdev(struct net_device *dev); 2131 extern void unregister_netdev(struct net_device *dev); 2132 2133 /* General hardware address lists handling functions */ 2134 extern int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list, 2135 struct netdev_hw_addr_list *from_list, 2136 int addr_len, unsigned char addr_type); 2137 extern void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list, 2138 struct netdev_hw_addr_list *from_list, 2139 int addr_len, unsigned char addr_type); 2140 extern int __hw_addr_sync(struct netdev_hw_addr_list *to_list, 2141 struct netdev_hw_addr_list *from_list, 2142 int addr_len); 2143 extern void __hw_addr_unsync(struct netdev_hw_addr_list *to_list, 2144 struct netdev_hw_addr_list *from_list, 2145 int addr_len); 2146 extern void __hw_addr_flush(struct netdev_hw_addr_list *list); 2147 extern void __hw_addr_init(struct netdev_hw_addr_list *list); 2148 2149 /* Functions used for device addresses handling */ 2150 extern int dev_addr_add(struct net_device *dev, unsigned char *addr, 2151 unsigned char addr_type); 2152 extern int dev_addr_del(struct net_device *dev, unsigned char *addr, 2153 unsigned char addr_type); 2154 extern int dev_addr_add_multiple(struct net_device *to_dev, 2155 struct net_device *from_dev, 2156 unsigned char addr_type); 2157 extern int dev_addr_del_multiple(struct net_device *to_dev, 2158 struct net_device *from_dev, 2159 unsigned char addr_type); 2160 extern void dev_addr_flush(struct net_device *dev); 2161 extern int dev_addr_init(struct net_device *dev); 2162 2163 /* Functions used for unicast addresses handling */ 2164 extern int dev_uc_add(struct net_device *dev, unsigned char *addr); 2165 extern int dev_uc_del(struct net_device *dev, unsigned char *addr); 2166 extern int dev_uc_sync(struct net_device *to, struct net_device *from); 2167 extern void dev_uc_unsync(struct net_device *to, struct net_device *from); 2168 extern void dev_uc_flush(struct net_device *dev); 2169 extern void dev_uc_init(struct net_device *dev); 2170 2171 /* Functions used for multicast addresses handling */ 2172 extern int dev_mc_add(struct net_device *dev, unsigned char *addr); 2173 extern int dev_mc_add_global(struct net_device *dev, unsigned char *addr); 2174 extern int dev_mc_del(struct net_device *dev, unsigned char *addr); 2175 extern int dev_mc_del_global(struct net_device *dev, unsigned char *addr); 2176 extern int dev_mc_sync(struct net_device *to, struct net_device *from); 2177 extern void dev_mc_unsync(struct net_device *to, struct net_device *from); 2178 extern void dev_mc_flush(struct net_device *dev); 2179 extern void dev_mc_init(struct net_device *dev); 2180 2181 /* Functions used for secondary unicast and multicast support */ 2182 extern void dev_set_rx_mode(struct net_device *dev); 2183 extern void __dev_set_rx_mode(struct net_device *dev); 2184 extern int dev_set_promiscuity(struct net_device *dev, int inc); 2185 extern int dev_set_allmulti(struct net_device *dev, int inc); 2186 extern void netdev_state_change(struct net_device *dev); 2187 extern int netdev_bonding_change(struct net_device *dev, 2188 unsigned long event); 2189 extern void netdev_features_change(struct net_device *dev); 2190 /* Load a device via the kmod */ 2191 extern void dev_load(struct net *net, const char *name); 2192 extern void dev_mcast_init(void); 2193 extern struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, 2194 struct rtnl_link_stats64 *storage); 2195 extern void dev_txq_stats_fold(const struct net_device *dev, 2196 struct rtnl_link_stats64 *stats); 2197 2198 extern int netdev_max_backlog; 2199 extern int netdev_tstamp_prequeue; 2200 extern int weight_p; 2201 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 2202 extern int skb_checksum_help(struct sk_buff *skb); 2203 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features); 2204 #ifdef CONFIG_BUG 2205 extern void netdev_rx_csum_fault(struct net_device *dev); 2206 #else 2207 static inline void netdev_rx_csum_fault(struct net_device *dev) 2208 { 2209 } 2210 #endif 2211 /* rx skb timestamps */ 2212 extern void net_enable_timestamp(void); 2213 extern void net_disable_timestamp(void); 2214 2215 #ifdef CONFIG_PROC_FS 2216 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 2217 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 2218 extern void dev_seq_stop(struct seq_file *seq, void *v); 2219 #endif 2220 2221 extern int netdev_class_create_file(struct class_attribute *class_attr); 2222 extern void netdev_class_remove_file(struct class_attribute *class_attr); 2223 2224 extern struct kobj_ns_type_operations net_ns_type_operations; 2225 2226 extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len); 2227 2228 extern void linkwatch_run_queue(void); 2229 2230 unsigned long netdev_increment_features(unsigned long all, unsigned long one, 2231 unsigned long mask); 2232 unsigned long netdev_fix_features(unsigned long features, const char *name); 2233 2234 void netif_stacked_transfer_operstate(const struct net_device *rootdev, 2235 struct net_device *dev); 2236 2237 static inline int net_gso_ok(int features, int gso_type) 2238 { 2239 int feature = gso_type << NETIF_F_GSO_SHIFT; 2240 return (features & feature) == feature; 2241 } 2242 2243 static inline int skb_gso_ok(struct sk_buff *skb, int features) 2244 { 2245 return net_gso_ok(features, skb_shinfo(skb)->gso_type) && 2246 (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST)); 2247 } 2248 2249 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb) 2250 { 2251 if (skb_is_gso(skb)) { 2252 int features = dev->features; 2253 2254 if (skb->protocol == htons(ETH_P_8021Q) || skb->vlan_tci) 2255 features &= dev->vlan_features; 2256 2257 return (!skb_gso_ok(skb, features) || 2258 unlikely(skb->ip_summed != CHECKSUM_PARTIAL)); 2259 } 2260 2261 return 0; 2262 } 2263 2264 static inline void netif_set_gso_max_size(struct net_device *dev, 2265 unsigned int size) 2266 { 2267 dev->gso_max_size = size; 2268 } 2269 2270 extern int __skb_bond_should_drop(struct sk_buff *skb, 2271 struct net_device *master); 2272 2273 static inline int skb_bond_should_drop(struct sk_buff *skb, 2274 struct net_device *master) 2275 { 2276 if (master) 2277 return __skb_bond_should_drop(skb, master); 2278 return 0; 2279 } 2280 2281 extern struct pernet_operations __net_initdata loopback_net_ops; 2282 2283 static inline int dev_ethtool_get_settings(struct net_device *dev, 2284 struct ethtool_cmd *cmd) 2285 { 2286 if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings) 2287 return -EOPNOTSUPP; 2288 return dev->ethtool_ops->get_settings(dev, cmd); 2289 } 2290 2291 static inline u32 dev_ethtool_get_rx_csum(struct net_device *dev) 2292 { 2293 if (!dev->ethtool_ops || !dev->ethtool_ops->get_rx_csum) 2294 return 0; 2295 return dev->ethtool_ops->get_rx_csum(dev); 2296 } 2297 2298 static inline u32 dev_ethtool_get_flags(struct net_device *dev) 2299 { 2300 if (!dev->ethtool_ops || !dev->ethtool_ops->get_flags) 2301 return 0; 2302 return dev->ethtool_ops->get_flags(dev); 2303 } 2304 2305 /* Logging, debugging and troubleshooting/diagnostic helpers. */ 2306 2307 /* netdev_printk helpers, similar to dev_printk */ 2308 2309 static inline const char *netdev_name(const struct net_device *dev) 2310 { 2311 if (dev->reg_state != NETREG_REGISTERED) 2312 return "(unregistered net_device)"; 2313 return dev->name; 2314 } 2315 2316 extern int netdev_printk(const char *level, const struct net_device *dev, 2317 const char *format, ...) 2318 __attribute__ ((format (printf, 3, 4))); 2319 extern int netdev_emerg(const struct net_device *dev, const char *format, ...) 2320 __attribute__ ((format (printf, 2, 3))); 2321 extern int netdev_alert(const struct net_device *dev, const char *format, ...) 2322 __attribute__ ((format (printf, 2, 3))); 2323 extern int netdev_crit(const struct net_device *dev, const char *format, ...) 2324 __attribute__ ((format (printf, 2, 3))); 2325 extern int netdev_err(const struct net_device *dev, const char *format, ...) 2326 __attribute__ ((format (printf, 2, 3))); 2327 extern int netdev_warn(const struct net_device *dev, const char *format, ...) 2328 __attribute__ ((format (printf, 2, 3))); 2329 extern int netdev_notice(const struct net_device *dev, const char *format, ...) 2330 __attribute__ ((format (printf, 2, 3))); 2331 extern int netdev_info(const struct net_device *dev, const char *format, ...) 2332 __attribute__ ((format (printf, 2, 3))); 2333 2334 #if defined(DEBUG) 2335 #define netdev_dbg(__dev, format, args...) \ 2336 netdev_printk(KERN_DEBUG, __dev, format, ##args) 2337 #elif defined(CONFIG_DYNAMIC_DEBUG) 2338 #define netdev_dbg(__dev, format, args...) \ 2339 do { \ 2340 dynamic_dev_dbg((__dev)->dev.parent, "%s: " format, \ 2341 netdev_name(__dev), ##args); \ 2342 } while (0) 2343 #else 2344 #define netdev_dbg(__dev, format, args...) \ 2345 ({ \ 2346 if (0) \ 2347 netdev_printk(KERN_DEBUG, __dev, format, ##args); \ 2348 0; \ 2349 }) 2350 #endif 2351 2352 #if defined(VERBOSE_DEBUG) 2353 #define netdev_vdbg netdev_dbg 2354 #else 2355 2356 #define netdev_vdbg(dev, format, args...) \ 2357 ({ \ 2358 if (0) \ 2359 netdev_printk(KERN_DEBUG, dev, format, ##args); \ 2360 0; \ 2361 }) 2362 #endif 2363 2364 /* 2365 * netdev_WARN() acts like dev_printk(), but with the key difference 2366 * of using a WARN/WARN_ON to get the message out, including the 2367 * file/line information and a backtrace. 2368 */ 2369 #define netdev_WARN(dev, format, args...) \ 2370 WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args); 2371 2372 /* netif printk helpers, similar to netdev_printk */ 2373 2374 #define netif_printk(priv, type, level, dev, fmt, args...) \ 2375 do { \ 2376 if (netif_msg_##type(priv)) \ 2377 netdev_printk(level, (dev), fmt, ##args); \ 2378 } while (0) 2379 2380 #define netif_level(level, priv, type, dev, fmt, args...) \ 2381 do { \ 2382 if (netif_msg_##type(priv)) \ 2383 netdev_##level(dev, fmt, ##args); \ 2384 } while (0) 2385 2386 #define netif_emerg(priv, type, dev, fmt, args...) \ 2387 netif_level(emerg, priv, type, dev, fmt, ##args) 2388 #define netif_alert(priv, type, dev, fmt, args...) \ 2389 netif_level(alert, priv, type, dev, fmt, ##args) 2390 #define netif_crit(priv, type, dev, fmt, args...) \ 2391 netif_level(crit, priv, type, dev, fmt, ##args) 2392 #define netif_err(priv, type, dev, fmt, args...) \ 2393 netif_level(err, priv, type, dev, fmt, ##args) 2394 #define netif_warn(priv, type, dev, fmt, args...) \ 2395 netif_level(warn, priv, type, dev, fmt, ##args) 2396 #define netif_notice(priv, type, dev, fmt, args...) \ 2397 netif_level(notice, priv, type, dev, fmt, ##args) 2398 #define netif_info(priv, type, dev, fmt, args...) \ 2399 netif_level(info, priv, type, dev, fmt, ##args) 2400 2401 #if defined(DEBUG) 2402 #define netif_dbg(priv, type, dev, format, args...) \ 2403 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args) 2404 #elif defined(CONFIG_DYNAMIC_DEBUG) 2405 #define netif_dbg(priv, type, netdev, format, args...) \ 2406 do { \ 2407 if (netif_msg_##type(priv)) \ 2408 dynamic_dev_dbg((netdev)->dev.parent, \ 2409 "%s: " format, \ 2410 netdev_name(netdev), ##args); \ 2411 } while (0) 2412 #else 2413 #define netif_dbg(priv, type, dev, format, args...) \ 2414 ({ \ 2415 if (0) \ 2416 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \ 2417 0; \ 2418 }) 2419 #endif 2420 2421 #if defined(VERBOSE_DEBUG) 2422 #define netif_vdbg netif_dbg 2423 #else 2424 #define netif_vdbg(priv, type, dev, format, args...) \ 2425 ({ \ 2426 if (0) \ 2427 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \ 2428 0; \ 2429 }) 2430 #endif 2431 2432 #endif /* __KERNEL__ */ 2433 2434 #endif /* _LINUX_NETDEVICE_H */ 2435