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/timer.h> 35 #include <linux/delay.h> 36 #include <linux/mm.h> 37 #include <asm/atomic.h> 38 #include <asm/cache.h> 39 #include <asm/byteorder.h> 40 41 #include <linux/device.h> 42 #include <linux/percpu.h> 43 #include <linux/rculist.h> 44 #include <linux/dmaengine.h> 45 #include <linux/workqueue.h> 46 47 #include <linux/ethtool.h> 48 #include <net/net_namespace.h> 49 #include <net/dsa.h> 50 #ifdef CONFIG_DCB 51 #include <net/dcbnl.h> 52 #endif 53 54 struct vlan_group; 55 struct netpoll_info; 56 /* 802.11 specific */ 57 struct wireless_dev; 58 /* source back-compat hooks */ 59 #define SET_ETHTOOL_OPS(netdev,ops) \ 60 ( (netdev)->ethtool_ops = (ops) ) 61 62 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev 63 functions are available. */ 64 #define HAVE_FREE_NETDEV /* free_netdev() */ 65 #define HAVE_NETDEV_PRIV /* netdev_priv() */ 66 67 /* Backlog congestion levels */ 68 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */ 69 #define NET_RX_DROP 1 /* packet dropped */ 70 71 /* 72 * Transmit return codes: transmit return codes originate from three different 73 * namespaces: 74 * 75 * - qdisc return codes 76 * - driver transmit return codes 77 * - errno values 78 * 79 * Drivers are allowed to return any one of those in their hard_start_xmit() 80 * function. Real network devices commonly used with qdiscs should only return 81 * the driver transmit return codes though - when qdiscs are used, the actual 82 * transmission happens asynchronously, so the value is not propagated to 83 * higher layers. Virtual network devices transmit synchronously, in this case 84 * the driver transmit return codes are consumed by dev_queue_xmit(), all 85 * others are propagated to higher layers. 86 */ 87 88 /* qdisc ->enqueue() return codes. */ 89 #define NET_XMIT_SUCCESS 0x00 90 #define NET_XMIT_DROP 0x01 /* skb dropped */ 91 #define NET_XMIT_CN 0x02 /* congestion notification */ 92 #define NET_XMIT_POLICED 0x03 /* skb is shot by police */ 93 #define NET_XMIT_MASK 0x0f /* qdisc flags in net/sch_generic.h */ 94 95 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It 96 * indicates that the device will soon be dropping packets, or already drops 97 * some packets of the same priority; prompting us to send less aggressively. */ 98 #define net_xmit_eval(e) ((e) == NET_XMIT_CN ? 0 : (e)) 99 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0) 100 101 /* Driver transmit return codes */ 102 #define NETDEV_TX_MASK 0xf0 103 104 enum netdev_tx { 105 __NETDEV_TX_MIN = INT_MIN, /* make sure enum is signed */ 106 NETDEV_TX_OK = 0x00, /* driver took care of packet */ 107 NETDEV_TX_BUSY = 0x10, /* driver tx path was busy*/ 108 NETDEV_TX_LOCKED = 0x20, /* driver tx lock was already taken */ 109 }; 110 typedef enum netdev_tx netdev_tx_t; 111 112 /* 113 * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant; 114 * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed. 115 */ 116 static inline bool dev_xmit_complete(int rc) 117 { 118 /* 119 * Positive cases with an skb consumed by a driver: 120 * - successful transmission (rc == NETDEV_TX_OK) 121 * - error while transmitting (rc < 0) 122 * - error while queueing to a different device (rc & NET_XMIT_MASK) 123 */ 124 if (likely(rc < NET_XMIT_MASK)) 125 return true; 126 127 return false; 128 } 129 130 #endif 131 132 #define MAX_ADDR_LEN 32 /* Largest hardware address length */ 133 134 #ifdef __KERNEL__ 135 /* 136 * Compute the worst case header length according to the protocols 137 * used. 138 */ 139 140 #if defined(CONFIG_WLAN) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 141 # if defined(CONFIG_MAC80211_MESH) 142 # define LL_MAX_HEADER 128 143 # else 144 # define LL_MAX_HEADER 96 145 # endif 146 #elif defined(CONFIG_TR) || defined(CONFIG_TR_MODULE) 147 # define LL_MAX_HEADER 48 148 #else 149 # define LL_MAX_HEADER 32 150 #endif 151 152 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \ 153 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \ 154 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \ 155 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE) 156 #define MAX_HEADER LL_MAX_HEADER 157 #else 158 #define MAX_HEADER (LL_MAX_HEADER + 48) 159 #endif 160 161 #endif /* __KERNEL__ */ 162 163 /* 164 * Network device statistics. Akin to the 2.0 ether stats but 165 * with byte counters. 166 */ 167 168 struct net_device_stats { 169 unsigned long rx_packets; /* total packets received */ 170 unsigned long tx_packets; /* total packets transmitted */ 171 unsigned long rx_bytes; /* total bytes received */ 172 unsigned long tx_bytes; /* total bytes transmitted */ 173 unsigned long rx_errors; /* bad packets received */ 174 unsigned long tx_errors; /* packet transmit problems */ 175 unsigned long rx_dropped; /* no space in linux buffers */ 176 unsigned long tx_dropped; /* no space available in linux */ 177 unsigned long multicast; /* multicast packets received */ 178 unsigned long collisions; 179 180 /* detailed rx_errors: */ 181 unsigned long rx_length_errors; 182 unsigned long rx_over_errors; /* receiver ring buff overflow */ 183 unsigned long rx_crc_errors; /* recved pkt with crc error */ 184 unsigned long rx_frame_errors; /* recv'd frame alignment error */ 185 unsigned long rx_fifo_errors; /* recv'r fifo overrun */ 186 unsigned long rx_missed_errors; /* receiver missed packet */ 187 188 /* detailed tx_errors */ 189 unsigned long tx_aborted_errors; 190 unsigned long tx_carrier_errors; 191 unsigned long tx_fifo_errors; 192 unsigned long tx_heartbeat_errors; 193 unsigned long tx_window_errors; 194 195 /* for cslip etc */ 196 unsigned long rx_compressed; 197 unsigned long tx_compressed; 198 }; 199 200 201 /* Media selection options. */ 202 enum { 203 IF_PORT_UNKNOWN = 0, 204 IF_PORT_10BASE2, 205 IF_PORT_10BASET, 206 IF_PORT_AUI, 207 IF_PORT_100BASET, 208 IF_PORT_100BASETX, 209 IF_PORT_100BASEFX 210 }; 211 212 #ifdef __KERNEL__ 213 214 #include <linux/cache.h> 215 #include <linux/skbuff.h> 216 217 struct neighbour; 218 struct neigh_parms; 219 struct sk_buff; 220 221 struct netif_rx_stats { 222 unsigned total; 223 unsigned dropped; 224 unsigned time_squeeze; 225 unsigned cpu_collision; 226 unsigned received_rps; 227 }; 228 229 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat); 230 231 struct dev_addr_list { 232 struct dev_addr_list *next; 233 u8 da_addr[MAX_ADDR_LEN]; 234 u8 da_addrlen; 235 u8 da_synced; 236 int da_users; 237 int da_gusers; 238 }; 239 240 /* 241 * We tag multicasts with these structures. 242 */ 243 244 #define dev_mc_list dev_addr_list 245 #define dmi_addr da_addr 246 #define dmi_addrlen da_addrlen 247 #define dmi_users da_users 248 #define dmi_gusers da_gusers 249 250 struct netdev_hw_addr { 251 struct list_head list; 252 unsigned char addr[MAX_ADDR_LEN]; 253 unsigned char type; 254 #define NETDEV_HW_ADDR_T_LAN 1 255 #define NETDEV_HW_ADDR_T_SAN 2 256 #define NETDEV_HW_ADDR_T_SLAVE 3 257 #define NETDEV_HW_ADDR_T_UNICAST 4 258 int refcount; 259 bool synced; 260 struct rcu_head rcu_head; 261 }; 262 263 struct netdev_hw_addr_list { 264 struct list_head list; 265 int count; 266 }; 267 268 #define netdev_uc_count(dev) ((dev)->uc.count) 269 #define netdev_uc_empty(dev) ((dev)->uc.count == 0) 270 #define netdev_for_each_uc_addr(ha, dev) \ 271 list_for_each_entry(ha, &dev->uc.list, list) 272 273 #define netdev_mc_count(dev) ((dev)->mc_count) 274 #define netdev_mc_empty(dev) (netdev_mc_count(dev) == 0) 275 276 #define netdev_for_each_mc_addr(mclist, dev) \ 277 for (mclist = dev->mc_list; mclist; mclist = mclist->next) 278 279 struct hh_cache { 280 struct hh_cache *hh_next; /* Next entry */ 281 atomic_t hh_refcnt; /* number of users */ 282 /* 283 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate 284 * cache line on SMP. 285 * They are mostly read, but hh_refcnt may be changed quite frequently, 286 * incurring cache line ping pongs. 287 */ 288 __be16 hh_type ____cacheline_aligned_in_smp; 289 /* protocol identifier, f.e ETH_P_IP 290 * NOTE: For VLANs, this will be the 291 * encapuslated type. --BLG 292 */ 293 u16 hh_len; /* length of header */ 294 int (*hh_output)(struct sk_buff *skb); 295 seqlock_t hh_lock; 296 297 /* cached hardware header; allow for machine alignment needs. */ 298 #define HH_DATA_MOD 16 299 #define HH_DATA_OFF(__len) \ 300 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) 301 #define HH_DATA_ALIGN(__len) \ 302 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) 303 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; 304 }; 305 306 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much. 307 * Alternative is: 308 * dev->hard_header_len ? (dev->hard_header_len + 309 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 310 * 311 * We could use other alignment values, but we must maintain the 312 * relationship HH alignment <= LL alignment. 313 * 314 * LL_ALLOCATED_SPACE also takes into account the tailroom the device 315 * may need. 316 */ 317 #define LL_RESERVED_SPACE(dev) \ 318 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 319 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 320 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 321 #define LL_ALLOCATED_SPACE(dev) \ 322 ((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 323 324 struct header_ops { 325 int (*create) (struct sk_buff *skb, struct net_device *dev, 326 unsigned short type, const void *daddr, 327 const void *saddr, unsigned len); 328 int (*parse)(const struct sk_buff *skb, unsigned char *haddr); 329 int (*rebuild)(struct sk_buff *skb); 330 #define HAVE_HEADER_CACHE 331 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh); 332 void (*cache_update)(struct hh_cache *hh, 333 const struct net_device *dev, 334 const unsigned char *haddr); 335 }; 336 337 /* These flag bits are private to the generic network queueing 338 * layer, they may not be explicitly referenced by any other 339 * code. 340 */ 341 342 enum netdev_state_t { 343 __LINK_STATE_START, 344 __LINK_STATE_PRESENT, 345 __LINK_STATE_NOCARRIER, 346 __LINK_STATE_LINKWATCH_PENDING, 347 __LINK_STATE_DORMANT, 348 }; 349 350 351 /* 352 * This structure holds at boot time configured netdevice settings. They 353 * are then used in the device probing. 354 */ 355 struct netdev_boot_setup { 356 char name[IFNAMSIZ]; 357 struct ifmap map; 358 }; 359 #define NETDEV_BOOT_SETUP_MAX 8 360 361 extern int __init netdev_boot_setup(char *str); 362 363 /* 364 * Structure for NAPI scheduling similar to tasklet but with weighting 365 */ 366 struct napi_struct { 367 /* The poll_list must only be managed by the entity which 368 * changes the state of the NAPI_STATE_SCHED bit. This means 369 * whoever atomically sets that bit can add this napi_struct 370 * to the per-cpu poll_list, and whoever clears that bit 371 * can remove from the list right before clearing the bit. 372 */ 373 struct list_head poll_list; 374 375 unsigned long state; 376 int weight; 377 int (*poll)(struct napi_struct *, int); 378 #ifdef CONFIG_NETPOLL 379 spinlock_t poll_lock; 380 int poll_owner; 381 #endif 382 383 unsigned int gro_count; 384 385 struct net_device *dev; 386 struct list_head dev_list; 387 struct sk_buff *gro_list; 388 struct sk_buff *skb; 389 }; 390 391 enum { 392 NAPI_STATE_SCHED, /* Poll is scheduled */ 393 NAPI_STATE_DISABLE, /* Disable pending */ 394 NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */ 395 }; 396 397 enum gro_result { 398 GRO_MERGED, 399 GRO_MERGED_FREE, 400 GRO_HELD, 401 GRO_NORMAL, 402 GRO_DROP, 403 }; 404 typedef enum gro_result gro_result_t; 405 406 extern void __napi_schedule(struct napi_struct *n); 407 408 static inline int napi_disable_pending(struct napi_struct *n) 409 { 410 return test_bit(NAPI_STATE_DISABLE, &n->state); 411 } 412 413 /** 414 * napi_schedule_prep - check if napi can be scheduled 415 * @n: napi context 416 * 417 * Test if NAPI routine is already running, and if not mark 418 * it as running. This is used as a condition variable 419 * insure only one NAPI poll instance runs. We also make 420 * sure there is no pending NAPI disable. 421 */ 422 static inline int napi_schedule_prep(struct napi_struct *n) 423 { 424 return !napi_disable_pending(n) && 425 !test_and_set_bit(NAPI_STATE_SCHED, &n->state); 426 } 427 428 /** 429 * napi_schedule - schedule NAPI poll 430 * @n: napi context 431 * 432 * Schedule NAPI poll routine to be called if it is not already 433 * running. 434 */ 435 static inline void napi_schedule(struct napi_struct *n) 436 { 437 if (napi_schedule_prep(n)) 438 __napi_schedule(n); 439 } 440 441 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */ 442 static inline int napi_reschedule(struct napi_struct *napi) 443 { 444 if (napi_schedule_prep(napi)) { 445 __napi_schedule(napi); 446 return 1; 447 } 448 return 0; 449 } 450 451 /** 452 * napi_complete - NAPI processing complete 453 * @n: napi context 454 * 455 * Mark NAPI processing as complete. 456 */ 457 extern void __napi_complete(struct napi_struct *n); 458 extern void napi_complete(struct napi_struct *n); 459 460 /** 461 * napi_disable - prevent NAPI from scheduling 462 * @n: napi context 463 * 464 * Stop NAPI from being scheduled on this context. 465 * Waits till any outstanding processing completes. 466 */ 467 static inline void napi_disable(struct napi_struct *n) 468 { 469 set_bit(NAPI_STATE_DISABLE, &n->state); 470 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state)) 471 msleep(1); 472 clear_bit(NAPI_STATE_DISABLE, &n->state); 473 } 474 475 /** 476 * napi_enable - enable NAPI scheduling 477 * @n: napi context 478 * 479 * Resume NAPI from being scheduled on this context. 480 * Must be paired with napi_disable. 481 */ 482 static inline void napi_enable(struct napi_struct *n) 483 { 484 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); 485 smp_mb__before_clear_bit(); 486 clear_bit(NAPI_STATE_SCHED, &n->state); 487 } 488 489 #ifdef CONFIG_SMP 490 /** 491 * napi_synchronize - wait until NAPI is not running 492 * @n: napi context 493 * 494 * Wait until NAPI is done being scheduled on this context. 495 * Waits till any outstanding processing completes but 496 * does not disable future activations. 497 */ 498 static inline void napi_synchronize(const struct napi_struct *n) 499 { 500 while (test_bit(NAPI_STATE_SCHED, &n->state)) 501 msleep(1); 502 } 503 #else 504 # define napi_synchronize(n) barrier() 505 #endif 506 507 enum netdev_queue_state_t { 508 __QUEUE_STATE_XOFF, 509 __QUEUE_STATE_FROZEN, 510 }; 511 512 struct netdev_queue { 513 /* 514 * read mostly part 515 */ 516 struct net_device *dev; 517 struct Qdisc *qdisc; 518 unsigned long state; 519 struct Qdisc *qdisc_sleeping; 520 /* 521 * write mostly part 522 */ 523 spinlock_t _xmit_lock ____cacheline_aligned_in_smp; 524 int xmit_lock_owner; 525 /* 526 * please use this field instead of dev->trans_start 527 */ 528 unsigned long trans_start; 529 unsigned long tx_bytes; 530 unsigned long tx_packets; 531 unsigned long tx_dropped; 532 } ____cacheline_aligned_in_smp; 533 534 #ifdef CONFIG_RPS 535 /* 536 * This structure holds an RPS map which can be of variable length. The 537 * map is an array of CPUs. 538 */ 539 struct rps_map { 540 unsigned int len; 541 struct rcu_head rcu; 542 u16 cpus[0]; 543 }; 544 #define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + (_num * sizeof(u16))) 545 546 /* This structure contains an instance of an RX queue. */ 547 struct netdev_rx_queue { 548 struct rps_map *rps_map; 549 struct kobject kobj; 550 struct netdev_rx_queue *first; 551 atomic_t count; 552 } ____cacheline_aligned_in_smp; 553 #endif 554 555 /* 556 * This structure defines the management hooks for network devices. 557 * The following hooks can be defined; unless noted otherwise, they are 558 * optional and can be filled with a null pointer. 559 * 560 * int (*ndo_init)(struct net_device *dev); 561 * This function is called once when network device is registered. 562 * The network device can use this to any late stage initializaton 563 * or semantic validattion. It can fail with an error code which will 564 * be propogated back to register_netdev 565 * 566 * void (*ndo_uninit)(struct net_device *dev); 567 * This function is called when device is unregistered or when registration 568 * fails. It is not called if init fails. 569 * 570 * int (*ndo_open)(struct net_device *dev); 571 * This function is called when network device transistions to the up 572 * state. 573 * 574 * int (*ndo_stop)(struct net_device *dev); 575 * This function is called when network device transistions to the down 576 * state. 577 * 578 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb, 579 * struct net_device *dev); 580 * Called when a packet needs to be transmitted. 581 * Must return NETDEV_TX_OK , NETDEV_TX_BUSY. 582 * (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX) 583 * Required can not be NULL. 584 * 585 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb); 586 * Called to decide which queue to when device supports multiple 587 * transmit queues. 588 * 589 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags); 590 * This function is called to allow device receiver to make 591 * changes to configuration when multicast or promiscious is enabled. 592 * 593 * void (*ndo_set_rx_mode)(struct net_device *dev); 594 * This function is called device changes address list filtering. 595 * 596 * void (*ndo_set_multicast_list)(struct net_device *dev); 597 * This function is called when the multicast address list changes. 598 * 599 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr); 600 * This function is called when the Media Access Control address 601 * needs to be changed. If this interface is not defined, the 602 * mac address can not be changed. 603 * 604 * int (*ndo_validate_addr)(struct net_device *dev); 605 * Test if Media Access Control address is valid for the device. 606 * 607 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd); 608 * Called when a user request an ioctl which can't be handled by 609 * the generic interface code. If not defined ioctl's return 610 * not supported error code. 611 * 612 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map); 613 * Used to set network devices bus interface parameters. This interface 614 * is retained for legacy reason, new devices should use the bus 615 * interface (PCI) for low level management. 616 * 617 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu); 618 * Called when a user wants to change the Maximum Transfer Unit 619 * of a device. If not defined, any request to change MTU will 620 * will return an error. 621 * 622 * void (*ndo_tx_timeout)(struct net_device *dev); 623 * Callback uses when the transmitter has not made any progress 624 * for dev->watchdog ticks. 625 * 626 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev); 627 * Called when a user wants to get the network device usage 628 * statistics. If not defined, the counters in dev->stats will 629 * be used. 630 * 631 * void (*ndo_vlan_rx_register)(struct net_device *dev, struct vlan_group *grp); 632 * If device support VLAN receive accleration 633 * (ie. dev->features & NETIF_F_HW_VLAN_RX), then this function is called 634 * when vlan groups for the device changes. Note: grp is NULL 635 * if no vlan's groups are being used. 636 * 637 * void (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid); 638 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER) 639 * this function is called when a VLAN id is registered. 640 * 641 * void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid); 642 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER) 643 * this function is called when a VLAN id is unregistered. 644 * 645 * void (*ndo_poll_controller)(struct net_device *dev); 646 * 647 * SR-IOV management functions. 648 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac); 649 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos); 650 * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate); 651 * int (*ndo_get_vf_config)(struct net_device *dev, 652 * int vf, struct ifla_vf_info *ivf); 653 */ 654 #define HAVE_NET_DEVICE_OPS 655 struct net_device_ops { 656 int (*ndo_init)(struct net_device *dev); 657 void (*ndo_uninit)(struct net_device *dev); 658 int (*ndo_open)(struct net_device *dev); 659 int (*ndo_stop)(struct net_device *dev); 660 netdev_tx_t (*ndo_start_xmit) (struct sk_buff *skb, 661 struct net_device *dev); 662 u16 (*ndo_select_queue)(struct net_device *dev, 663 struct sk_buff *skb); 664 void (*ndo_change_rx_flags)(struct net_device *dev, 665 int flags); 666 void (*ndo_set_rx_mode)(struct net_device *dev); 667 void (*ndo_set_multicast_list)(struct net_device *dev); 668 int (*ndo_set_mac_address)(struct net_device *dev, 669 void *addr); 670 int (*ndo_validate_addr)(struct net_device *dev); 671 int (*ndo_do_ioctl)(struct net_device *dev, 672 struct ifreq *ifr, int cmd); 673 int (*ndo_set_config)(struct net_device *dev, 674 struct ifmap *map); 675 int (*ndo_change_mtu)(struct net_device *dev, 676 int new_mtu); 677 int (*ndo_neigh_setup)(struct net_device *dev, 678 struct neigh_parms *); 679 void (*ndo_tx_timeout) (struct net_device *dev); 680 681 struct net_device_stats* (*ndo_get_stats)(struct net_device *dev); 682 683 void (*ndo_vlan_rx_register)(struct net_device *dev, 684 struct vlan_group *grp); 685 void (*ndo_vlan_rx_add_vid)(struct net_device *dev, 686 unsigned short vid); 687 void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, 688 unsigned short vid); 689 #ifdef CONFIG_NET_POLL_CONTROLLER 690 void (*ndo_poll_controller)(struct net_device *dev); 691 #endif 692 int (*ndo_set_vf_mac)(struct net_device *dev, 693 int queue, u8 *mac); 694 int (*ndo_set_vf_vlan)(struct net_device *dev, 695 int queue, u16 vlan, u8 qos); 696 int (*ndo_set_vf_tx_rate)(struct net_device *dev, 697 int vf, int rate); 698 int (*ndo_get_vf_config)(struct net_device *dev, 699 int vf, 700 struct ifla_vf_info *ivf); 701 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 702 int (*ndo_fcoe_enable)(struct net_device *dev); 703 int (*ndo_fcoe_disable)(struct net_device *dev); 704 int (*ndo_fcoe_ddp_setup)(struct net_device *dev, 705 u16 xid, 706 struct scatterlist *sgl, 707 unsigned int sgc); 708 int (*ndo_fcoe_ddp_done)(struct net_device *dev, 709 u16 xid); 710 #define NETDEV_FCOE_WWNN 0 711 #define NETDEV_FCOE_WWPN 1 712 int (*ndo_fcoe_get_wwn)(struct net_device *dev, 713 u64 *wwn, int type); 714 #endif 715 }; 716 717 /* 718 * The DEVICE structure. 719 * Actually, this whole structure is a big mistake. It mixes I/O 720 * data with strictly "high-level" data, and it has to know about 721 * almost every data structure used in the INET module. 722 * 723 * FIXME: cleanup struct net_device such that network protocol info 724 * moves out. 725 */ 726 727 struct net_device { 728 729 /* 730 * This is the first field of the "visible" part of this structure 731 * (i.e. as seen by users in the "Space.c" file). It is the name 732 * the interface. 733 */ 734 char name[IFNAMSIZ]; 735 /* device name hash chain */ 736 struct hlist_node name_hlist; 737 /* snmp alias */ 738 char *ifalias; 739 740 /* 741 * I/O specific fields 742 * FIXME: Merge these and struct ifmap into one 743 */ 744 unsigned long mem_end; /* shared mem end */ 745 unsigned long mem_start; /* shared mem start */ 746 unsigned long base_addr; /* device I/O address */ 747 unsigned int irq; /* device IRQ number */ 748 749 /* 750 * Some hardware also needs these fields, but they are not 751 * part of the usual set specified in Space.c. 752 */ 753 754 unsigned char if_port; /* Selectable AUI, TP,..*/ 755 unsigned char dma; /* DMA channel */ 756 757 unsigned long state; 758 759 struct list_head dev_list; 760 struct list_head napi_list; 761 struct list_head unreg_list; 762 763 /* Net device features */ 764 unsigned long features; 765 #define NETIF_F_SG 1 /* Scatter/gather IO. */ 766 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */ 767 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ 768 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ 769 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */ 770 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ 771 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ 772 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ 773 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ 774 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ 775 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ 776 #define NETIF_F_GSO 2048 /* Enable software GSO. */ 777 #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */ 778 /* do not use LLTX in new drivers */ 779 #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */ 780 #define NETIF_F_GRO 16384 /* Generic receive offload */ 781 #define NETIF_F_LRO 32768 /* large receive offload */ 782 783 /* the GSO_MASK reserves bits 16 through 23 */ 784 #define NETIF_F_FCOE_CRC (1 << 24) /* FCoE CRC32 */ 785 #define NETIF_F_SCTP_CSUM (1 << 25) /* SCTP checksum offload */ 786 #define NETIF_F_FCOE_MTU (1 << 26) /* Supports max FCoE MTU, 2158 bytes*/ 787 #define NETIF_F_NTUPLE (1 << 27) /* N-tuple filters supported */ 788 789 /* Segmentation offload features */ 790 #define NETIF_F_GSO_SHIFT 16 791 #define NETIF_F_GSO_MASK 0x00ff0000 792 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT) 793 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT) 794 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT) 795 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT) 796 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT) 797 #define NETIF_F_FSO (SKB_GSO_FCOE << NETIF_F_GSO_SHIFT) 798 799 /* List of features with software fallbacks. */ 800 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6) 801 802 803 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM) 804 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM) 805 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM) 806 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM) 807 808 /* 809 * If one device supports one of these features, then enable them 810 * for all in netdev_increment_features. 811 */ 812 #define NETIF_F_ONE_FOR_ALL (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \ 813 NETIF_F_SG | NETIF_F_HIGHDMA | \ 814 NETIF_F_FRAGLIST) 815 816 /* Interface index. Unique device identifier */ 817 int ifindex; 818 int iflink; 819 820 struct net_device_stats stats; 821 822 #ifdef CONFIG_WIRELESS_EXT 823 /* List of functions to handle Wireless Extensions (instead of ioctl). 824 * See <net/iw_handler.h> for details. Jean II */ 825 const struct iw_handler_def * wireless_handlers; 826 /* Instance data managed by the core of Wireless Extensions. */ 827 struct iw_public_data * wireless_data; 828 #endif 829 /* Management operations */ 830 const struct net_device_ops *netdev_ops; 831 const struct ethtool_ops *ethtool_ops; 832 833 /* Hardware header description */ 834 const struct header_ops *header_ops; 835 836 unsigned int flags; /* interface flags (a la BSD) */ 837 unsigned short gflags; 838 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ 839 unsigned short padded; /* How much padding added by alloc_netdev() */ 840 841 unsigned char operstate; /* RFC2863 operstate */ 842 unsigned char link_mode; /* mapping policy to operstate */ 843 844 unsigned mtu; /* interface MTU value */ 845 unsigned short type; /* interface hardware type */ 846 unsigned short hard_header_len; /* hardware hdr length */ 847 848 /* extra head- and tailroom the hardware may need, but not in all cases 849 * can this be guaranteed, especially tailroom. Some cases also use 850 * LL_MAX_HEADER instead to allocate the skb. 851 */ 852 unsigned short needed_headroom; 853 unsigned short needed_tailroom; 854 855 struct net_device *master; /* Pointer to master device of a group, 856 * which this device is member of. 857 */ 858 859 /* Interface address info. */ 860 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ 861 unsigned char addr_len; /* hardware address length */ 862 unsigned short dev_id; /* for shared network cards */ 863 864 struct netdev_hw_addr_list uc; /* Secondary unicast 865 mac addresses */ 866 int uc_promisc; 867 spinlock_t addr_list_lock; 868 struct dev_addr_list *mc_list; /* Multicast mac addresses */ 869 int mc_count; /* Number of installed mcasts */ 870 unsigned int promiscuity; 871 unsigned int allmulti; 872 873 874 /* Protocol specific pointers */ 875 876 #ifdef CONFIG_NET_DSA 877 void *dsa_ptr; /* dsa specific data */ 878 #endif 879 void *atalk_ptr; /* AppleTalk link */ 880 void *ip_ptr; /* IPv4 specific data */ 881 void *dn_ptr; /* DECnet specific data */ 882 void *ip6_ptr; /* IPv6 specific data */ 883 void *ec_ptr; /* Econet specific data */ 884 void *ax25_ptr; /* AX.25 specific data */ 885 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data, 886 assign before registering */ 887 888 /* 889 * Cache line mostly used on receive path (including eth_type_trans()) 890 */ 891 unsigned long last_rx; /* Time of last Rx */ 892 /* Interface address info used in eth_type_trans() */ 893 unsigned char *dev_addr; /* hw address, (before bcast 894 because most packets are 895 unicast) */ 896 897 struct netdev_hw_addr_list dev_addrs; /* list of device 898 hw addresses */ 899 900 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 901 902 #ifdef CONFIG_RPS 903 struct kset *queues_kset; 904 905 struct netdev_rx_queue *_rx; 906 907 /* Number of RX queues allocated at alloc_netdev_mq() time */ 908 unsigned int num_rx_queues; 909 #endif 910 911 struct netdev_queue rx_queue; 912 913 struct netdev_queue *_tx ____cacheline_aligned_in_smp; 914 915 /* Number of TX queues allocated at alloc_netdev_mq() time */ 916 unsigned int num_tx_queues; 917 918 /* Number of TX queues currently active in device */ 919 unsigned int real_num_tx_queues; 920 921 /* root qdisc from userspace point of view */ 922 struct Qdisc *qdisc; 923 924 unsigned long tx_queue_len; /* Max frames per queue allowed */ 925 spinlock_t tx_global_lock; 926 /* 927 * One part is mostly used on xmit path (device) 928 */ 929 /* These may be needed for future network-power-down code. */ 930 931 /* 932 * trans_start here is expensive for high speed devices on SMP, 933 * please use netdev_queue->trans_start instead. 934 */ 935 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 936 937 int watchdog_timeo; /* used by dev_watchdog() */ 938 struct timer_list watchdog_timer; 939 940 /* Number of references to this device */ 941 atomic_t refcnt ____cacheline_aligned_in_smp; 942 943 /* delayed register/unregister */ 944 struct list_head todo_list; 945 /* device index hash chain */ 946 struct hlist_node index_hlist; 947 948 struct list_head link_watch_list; 949 950 /* register/unregister state machine */ 951 enum { NETREG_UNINITIALIZED=0, 952 NETREG_REGISTERED, /* completed register_netdevice */ 953 NETREG_UNREGISTERING, /* called unregister_netdevice */ 954 NETREG_UNREGISTERED, /* completed unregister todo */ 955 NETREG_RELEASED, /* called free_netdev */ 956 NETREG_DUMMY, /* dummy device for NAPI poll */ 957 } reg_state:16; 958 959 enum { 960 RTNL_LINK_INITIALIZED, 961 RTNL_LINK_INITIALIZING, 962 } rtnl_link_state:16; 963 964 /* Called from unregister, can be used to call free_netdev */ 965 void (*destructor)(struct net_device *dev); 966 967 #ifdef CONFIG_NETPOLL 968 struct netpoll_info *npinfo; 969 #endif 970 971 #ifdef CONFIG_NET_NS 972 /* Network namespace this network device is inside */ 973 struct net *nd_net; 974 #endif 975 976 /* mid-layer private */ 977 void *ml_priv; 978 979 /* bridge stuff */ 980 struct net_bridge_port *br_port; 981 /* macvlan */ 982 struct macvlan_port *macvlan_port; 983 /* GARP */ 984 struct garp_port *garp_port; 985 986 /* class/net/name entry */ 987 struct device dev; 988 /* space for optional device, statistics, and wireless sysfs groups */ 989 const struct attribute_group *sysfs_groups[4]; 990 991 /* rtnetlink link ops */ 992 const struct rtnl_link_ops *rtnl_link_ops; 993 994 /* VLAN feature mask */ 995 unsigned long vlan_features; 996 997 /* for setting kernel sock attribute on TCP connection setup */ 998 #define GSO_MAX_SIZE 65536 999 unsigned int gso_max_size; 1000 1001 #ifdef CONFIG_DCB 1002 /* Data Center Bridging netlink ops */ 1003 const struct dcbnl_rtnl_ops *dcbnl_ops; 1004 #endif 1005 1006 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 1007 /* max exchange id for FCoE LRO by ddp */ 1008 unsigned int fcoe_ddp_xid; 1009 #endif 1010 /* n-tuple filter list attached to this device */ 1011 struct ethtool_rx_ntuple_list ethtool_ntuple_list; 1012 }; 1013 #define to_net_dev(d) container_of(d, struct net_device, dev) 1014 1015 #define NETDEV_ALIGN 32 1016 1017 static inline 1018 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev, 1019 unsigned int index) 1020 { 1021 return &dev->_tx[index]; 1022 } 1023 1024 static inline void netdev_for_each_tx_queue(struct net_device *dev, 1025 void (*f)(struct net_device *, 1026 struct netdev_queue *, 1027 void *), 1028 void *arg) 1029 { 1030 unsigned int i; 1031 1032 for (i = 0; i < dev->num_tx_queues; i++) 1033 f(dev, &dev->_tx[i], arg); 1034 } 1035 1036 /* 1037 * Net namespace inlines 1038 */ 1039 static inline 1040 struct net *dev_net(const struct net_device *dev) 1041 { 1042 #ifdef CONFIG_NET_NS 1043 return dev->nd_net; 1044 #else 1045 return &init_net; 1046 #endif 1047 } 1048 1049 static inline 1050 void dev_net_set(struct net_device *dev, struct net *net) 1051 { 1052 #ifdef CONFIG_NET_NS 1053 release_net(dev->nd_net); 1054 dev->nd_net = hold_net(net); 1055 #endif 1056 } 1057 1058 static inline bool netdev_uses_dsa_tags(struct net_device *dev) 1059 { 1060 #ifdef CONFIG_NET_DSA_TAG_DSA 1061 if (dev->dsa_ptr != NULL) 1062 return dsa_uses_dsa_tags(dev->dsa_ptr); 1063 #endif 1064 1065 return 0; 1066 } 1067 1068 #ifndef CONFIG_NET_NS 1069 static inline void skb_set_dev(struct sk_buff *skb, struct net_device *dev) 1070 { 1071 skb->dev = dev; 1072 } 1073 #else /* CONFIG_NET_NS */ 1074 void skb_set_dev(struct sk_buff *skb, struct net_device *dev); 1075 #endif 1076 1077 static inline bool netdev_uses_trailer_tags(struct net_device *dev) 1078 { 1079 #ifdef CONFIG_NET_DSA_TAG_TRAILER 1080 if (dev->dsa_ptr != NULL) 1081 return dsa_uses_trailer_tags(dev->dsa_ptr); 1082 #endif 1083 1084 return 0; 1085 } 1086 1087 /** 1088 * netdev_priv - access network device private data 1089 * @dev: network device 1090 * 1091 * Get network device private data 1092 */ 1093 static inline void *netdev_priv(const struct net_device *dev) 1094 { 1095 return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN); 1096 } 1097 1098 /* Set the sysfs physical device reference for the network logical device 1099 * if set prior to registration will cause a symlink during initialization. 1100 */ 1101 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) 1102 1103 /* Set the sysfs device type for the network logical device to allow 1104 * fin grained indentification of different network device types. For 1105 * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc. 1106 */ 1107 #define SET_NETDEV_DEVTYPE(net, devtype) ((net)->dev.type = (devtype)) 1108 1109 /** 1110 * netif_napi_add - initialize a napi context 1111 * @dev: network device 1112 * @napi: napi context 1113 * @poll: polling function 1114 * @weight: default weight 1115 * 1116 * netif_napi_add() must be used to initialize a napi context prior to calling 1117 * *any* of the other napi related functions. 1118 */ 1119 void netif_napi_add(struct net_device *dev, struct napi_struct *napi, 1120 int (*poll)(struct napi_struct *, int), int weight); 1121 1122 /** 1123 * netif_napi_del - remove a napi context 1124 * @napi: napi context 1125 * 1126 * netif_napi_del() removes a napi context from the network device napi list 1127 */ 1128 void netif_napi_del(struct napi_struct *napi); 1129 1130 struct napi_gro_cb { 1131 /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */ 1132 void *frag0; 1133 1134 /* Length of frag0. */ 1135 unsigned int frag0_len; 1136 1137 /* This indicates where we are processing relative to skb->data. */ 1138 int data_offset; 1139 1140 /* This is non-zero if the packet may be of the same flow. */ 1141 int same_flow; 1142 1143 /* This is non-zero if the packet cannot be merged with the new skb. */ 1144 int flush; 1145 1146 /* Number of segments aggregated. */ 1147 int count; 1148 1149 /* Free the skb? */ 1150 int free; 1151 }; 1152 1153 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb) 1154 1155 struct packet_type { 1156 __be16 type; /* This is really htons(ether_type). */ 1157 struct net_device *dev; /* NULL is wildcarded here */ 1158 int (*func) (struct sk_buff *, 1159 struct net_device *, 1160 struct packet_type *, 1161 struct net_device *); 1162 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 1163 int features); 1164 int (*gso_send_check)(struct sk_buff *skb); 1165 struct sk_buff **(*gro_receive)(struct sk_buff **head, 1166 struct sk_buff *skb); 1167 int (*gro_complete)(struct sk_buff *skb); 1168 void *af_packet_priv; 1169 struct list_head list; 1170 }; 1171 1172 #include <linux/interrupt.h> 1173 #include <linux/notifier.h> 1174 1175 extern rwlock_t dev_base_lock; /* Device list lock */ 1176 1177 1178 #define for_each_netdev(net, d) \ 1179 list_for_each_entry(d, &(net)->dev_base_head, dev_list) 1180 #define for_each_netdev_reverse(net, d) \ 1181 list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list) 1182 #define for_each_netdev_rcu(net, d) \ 1183 list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list) 1184 #define for_each_netdev_safe(net, d, n) \ 1185 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list) 1186 #define for_each_netdev_continue(net, d) \ 1187 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list) 1188 #define for_each_netdev_continue_rcu(net, d) \ 1189 list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list) 1190 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) 1191 1192 static inline struct net_device *next_net_device(struct net_device *dev) 1193 { 1194 struct list_head *lh; 1195 struct net *net; 1196 1197 net = dev_net(dev); 1198 lh = dev->dev_list.next; 1199 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 1200 } 1201 1202 static inline struct net_device *next_net_device_rcu(struct net_device *dev) 1203 { 1204 struct list_head *lh; 1205 struct net *net; 1206 1207 net = dev_net(dev); 1208 lh = rcu_dereference(dev->dev_list.next); 1209 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 1210 } 1211 1212 static inline struct net_device *first_net_device(struct net *net) 1213 { 1214 return list_empty(&net->dev_base_head) ? NULL : 1215 net_device_entry(net->dev_base_head.next); 1216 } 1217 1218 extern int netdev_boot_setup_check(struct net_device *dev); 1219 extern unsigned long netdev_boot_base(const char *prefix, int unit); 1220 extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr); 1221 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type); 1222 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type); 1223 extern void dev_add_pack(struct packet_type *pt); 1224 extern void dev_remove_pack(struct packet_type *pt); 1225 extern void __dev_remove_pack(struct packet_type *pt); 1226 1227 extern struct net_device *dev_get_by_flags(struct net *net, unsigned short flags, 1228 unsigned short mask); 1229 extern struct net_device *dev_get_by_name(struct net *net, const char *name); 1230 extern struct net_device *dev_get_by_name_rcu(struct net *net, const char *name); 1231 extern struct net_device *__dev_get_by_name(struct net *net, const char *name); 1232 extern int dev_alloc_name(struct net_device *dev, const char *name); 1233 extern int dev_open(struct net_device *dev); 1234 extern int dev_close(struct net_device *dev); 1235 extern void dev_disable_lro(struct net_device *dev); 1236 extern int dev_queue_xmit(struct sk_buff *skb); 1237 extern int register_netdevice(struct net_device *dev); 1238 extern void unregister_netdevice_queue(struct net_device *dev, 1239 struct list_head *head); 1240 extern void unregister_netdevice_many(struct list_head *head); 1241 static inline void unregister_netdevice(struct net_device *dev) 1242 { 1243 unregister_netdevice_queue(dev, NULL); 1244 } 1245 1246 extern void free_netdev(struct net_device *dev); 1247 extern void synchronize_net(void); 1248 extern int register_netdevice_notifier(struct notifier_block *nb); 1249 extern int unregister_netdevice_notifier(struct notifier_block *nb); 1250 extern int init_dummy_netdev(struct net_device *dev); 1251 extern void netdev_resync_ops(struct net_device *dev); 1252 1253 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev); 1254 extern struct net_device *dev_get_by_index(struct net *net, int ifindex); 1255 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex); 1256 extern struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex); 1257 extern int dev_restart(struct net_device *dev); 1258 #ifdef CONFIG_NETPOLL_TRAP 1259 extern int netpoll_trap(void); 1260 #endif 1261 extern int skb_gro_receive(struct sk_buff **head, 1262 struct sk_buff *skb); 1263 extern void skb_gro_reset_offset(struct sk_buff *skb); 1264 1265 static inline unsigned int skb_gro_offset(const struct sk_buff *skb) 1266 { 1267 return NAPI_GRO_CB(skb)->data_offset; 1268 } 1269 1270 static inline unsigned int skb_gro_len(const struct sk_buff *skb) 1271 { 1272 return skb->len - NAPI_GRO_CB(skb)->data_offset; 1273 } 1274 1275 static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len) 1276 { 1277 NAPI_GRO_CB(skb)->data_offset += len; 1278 } 1279 1280 static inline void *skb_gro_header_fast(struct sk_buff *skb, 1281 unsigned int offset) 1282 { 1283 return NAPI_GRO_CB(skb)->frag0 + offset; 1284 } 1285 1286 static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen) 1287 { 1288 return NAPI_GRO_CB(skb)->frag0_len < hlen; 1289 } 1290 1291 static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen, 1292 unsigned int offset) 1293 { 1294 NAPI_GRO_CB(skb)->frag0 = NULL; 1295 NAPI_GRO_CB(skb)->frag0_len = 0; 1296 return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL; 1297 } 1298 1299 static inline void *skb_gro_mac_header(struct sk_buff *skb) 1300 { 1301 return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb); 1302 } 1303 1304 static inline void *skb_gro_network_header(struct sk_buff *skb) 1305 { 1306 return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) + 1307 skb_network_offset(skb); 1308 } 1309 1310 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, 1311 unsigned short type, 1312 const void *daddr, const void *saddr, 1313 unsigned len) 1314 { 1315 if (!dev->header_ops || !dev->header_ops->create) 1316 return 0; 1317 1318 return dev->header_ops->create(skb, dev, type, daddr, saddr, len); 1319 } 1320 1321 static inline int dev_parse_header(const struct sk_buff *skb, 1322 unsigned char *haddr) 1323 { 1324 const struct net_device *dev = skb->dev; 1325 1326 if (!dev->header_ops || !dev->header_ops->parse) 1327 return 0; 1328 return dev->header_ops->parse(skb, haddr); 1329 } 1330 1331 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 1332 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 1333 static inline int unregister_gifconf(unsigned int family) 1334 { 1335 return register_gifconf(family, NULL); 1336 } 1337 1338 /* 1339 * Incoming packets are placed on per-cpu queues so that 1340 * no locking is needed. 1341 */ 1342 struct softnet_data { 1343 struct Qdisc *output_queue; 1344 struct list_head poll_list; 1345 struct sk_buff *completion_queue; 1346 1347 /* Elements below can be accessed between CPUs for RPS */ 1348 #ifdef CONFIG_SMP 1349 struct call_single_data csd ____cacheline_aligned_in_smp; 1350 #endif 1351 struct sk_buff_head input_pkt_queue; 1352 struct napi_struct backlog; 1353 }; 1354 1355 DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); 1356 1357 #define HAVE_NETIF_QUEUE 1358 1359 extern void __netif_schedule(struct Qdisc *q); 1360 1361 static inline void netif_schedule_queue(struct netdev_queue *txq) 1362 { 1363 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state)) 1364 __netif_schedule(txq->qdisc); 1365 } 1366 1367 static inline void netif_tx_schedule_all(struct net_device *dev) 1368 { 1369 unsigned int i; 1370 1371 for (i = 0; i < dev->num_tx_queues; i++) 1372 netif_schedule_queue(netdev_get_tx_queue(dev, i)); 1373 } 1374 1375 static inline void netif_tx_start_queue(struct netdev_queue *dev_queue) 1376 { 1377 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1378 } 1379 1380 /** 1381 * netif_start_queue - allow transmit 1382 * @dev: network device 1383 * 1384 * Allow upper layers to call the device hard_start_xmit routine. 1385 */ 1386 static inline void netif_start_queue(struct net_device *dev) 1387 { 1388 netif_tx_start_queue(netdev_get_tx_queue(dev, 0)); 1389 } 1390 1391 static inline void netif_tx_start_all_queues(struct net_device *dev) 1392 { 1393 unsigned int i; 1394 1395 for (i = 0; i < dev->num_tx_queues; i++) { 1396 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1397 netif_tx_start_queue(txq); 1398 } 1399 } 1400 1401 static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue) 1402 { 1403 #ifdef CONFIG_NETPOLL_TRAP 1404 if (netpoll_trap()) { 1405 netif_tx_start_queue(dev_queue); 1406 return; 1407 } 1408 #endif 1409 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state)) 1410 __netif_schedule(dev_queue->qdisc); 1411 } 1412 1413 /** 1414 * netif_wake_queue - restart transmit 1415 * @dev: network device 1416 * 1417 * Allow upper layers to call the device hard_start_xmit routine. 1418 * Used for flow control when transmit resources are available. 1419 */ 1420 static inline void netif_wake_queue(struct net_device *dev) 1421 { 1422 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0)); 1423 } 1424 1425 static inline void netif_tx_wake_all_queues(struct net_device *dev) 1426 { 1427 unsigned int i; 1428 1429 for (i = 0; i < dev->num_tx_queues; i++) { 1430 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1431 netif_tx_wake_queue(txq); 1432 } 1433 } 1434 1435 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue) 1436 { 1437 set_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1438 } 1439 1440 /** 1441 * netif_stop_queue - stop transmitted packets 1442 * @dev: network device 1443 * 1444 * Stop upper layers calling the device hard_start_xmit routine. 1445 * Used for flow control when transmit resources are unavailable. 1446 */ 1447 static inline void netif_stop_queue(struct net_device *dev) 1448 { 1449 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0)); 1450 } 1451 1452 static inline void netif_tx_stop_all_queues(struct net_device *dev) 1453 { 1454 unsigned int i; 1455 1456 for (i = 0; i < dev->num_tx_queues; i++) { 1457 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1458 netif_tx_stop_queue(txq); 1459 } 1460 } 1461 1462 static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue) 1463 { 1464 return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1465 } 1466 1467 /** 1468 * netif_queue_stopped - test if transmit queue is flowblocked 1469 * @dev: network device 1470 * 1471 * Test if transmit queue on device is currently unable to send. 1472 */ 1473 static inline int netif_queue_stopped(const struct net_device *dev) 1474 { 1475 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0)); 1476 } 1477 1478 static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue) 1479 { 1480 return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state); 1481 } 1482 1483 /** 1484 * netif_running - test if up 1485 * @dev: network device 1486 * 1487 * Test if the device has been brought up. 1488 */ 1489 static inline int netif_running(const struct net_device *dev) 1490 { 1491 return test_bit(__LINK_STATE_START, &dev->state); 1492 } 1493 1494 /* 1495 * Routines to manage the subqueues on a device. We only need start 1496 * stop, and a check if it's stopped. All other device management is 1497 * done at the overall netdevice level. 1498 * Also test the device if we're multiqueue. 1499 */ 1500 1501 /** 1502 * netif_start_subqueue - allow sending packets on subqueue 1503 * @dev: network device 1504 * @queue_index: sub queue index 1505 * 1506 * Start individual transmit queue of a device with multiple transmit queues. 1507 */ 1508 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 1509 { 1510 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1511 1512 netif_tx_start_queue(txq); 1513 } 1514 1515 /** 1516 * netif_stop_subqueue - stop sending packets on subqueue 1517 * @dev: network device 1518 * @queue_index: sub queue index 1519 * 1520 * Stop individual transmit queue of a device with multiple transmit queues. 1521 */ 1522 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 1523 { 1524 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1525 #ifdef CONFIG_NETPOLL_TRAP 1526 if (netpoll_trap()) 1527 return; 1528 #endif 1529 netif_tx_stop_queue(txq); 1530 } 1531 1532 /** 1533 * netif_subqueue_stopped - test status of subqueue 1534 * @dev: network device 1535 * @queue_index: sub queue index 1536 * 1537 * Check individual transmit queue of a device with multiple transmit queues. 1538 */ 1539 static inline int __netif_subqueue_stopped(const struct net_device *dev, 1540 u16 queue_index) 1541 { 1542 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1543 1544 return netif_tx_queue_stopped(txq); 1545 } 1546 1547 static inline int netif_subqueue_stopped(const struct net_device *dev, 1548 struct sk_buff *skb) 1549 { 1550 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb)); 1551 } 1552 1553 /** 1554 * netif_wake_subqueue - allow sending packets on subqueue 1555 * @dev: network device 1556 * @queue_index: sub queue index 1557 * 1558 * Resume individual transmit queue of a device with multiple transmit queues. 1559 */ 1560 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 1561 { 1562 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1563 #ifdef CONFIG_NETPOLL_TRAP 1564 if (netpoll_trap()) 1565 return; 1566 #endif 1567 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state)) 1568 __netif_schedule(txq->qdisc); 1569 } 1570 1571 /** 1572 * netif_is_multiqueue - test if device has multiple transmit queues 1573 * @dev: network device 1574 * 1575 * Check if device has multiple transmit queues 1576 */ 1577 static inline int netif_is_multiqueue(const struct net_device *dev) 1578 { 1579 return (dev->num_tx_queues > 1); 1580 } 1581 1582 /* Use this variant when it is known for sure that it 1583 * is executing from hardware interrupt context or with hardware interrupts 1584 * disabled. 1585 */ 1586 extern void dev_kfree_skb_irq(struct sk_buff *skb); 1587 1588 /* Use this variant in places where it could be invoked 1589 * from either hardware interrupt or other context, with hardware interrupts 1590 * either disabled or enabled. 1591 */ 1592 extern void dev_kfree_skb_any(struct sk_buff *skb); 1593 1594 #define HAVE_NETIF_RX 1 1595 extern int netif_rx(struct sk_buff *skb); 1596 extern int netif_rx_ni(struct sk_buff *skb); 1597 #define HAVE_NETIF_RECEIVE_SKB 1 1598 extern int netif_receive_skb(struct sk_buff *skb); 1599 extern gro_result_t dev_gro_receive(struct napi_struct *napi, 1600 struct sk_buff *skb); 1601 extern gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb); 1602 extern gro_result_t napi_gro_receive(struct napi_struct *napi, 1603 struct sk_buff *skb); 1604 extern void napi_reuse_skb(struct napi_struct *napi, 1605 struct sk_buff *skb); 1606 extern struct sk_buff * napi_get_frags(struct napi_struct *napi); 1607 extern gro_result_t napi_frags_finish(struct napi_struct *napi, 1608 struct sk_buff *skb, 1609 gro_result_t ret); 1610 extern struct sk_buff * napi_frags_skb(struct napi_struct *napi); 1611 extern gro_result_t napi_gro_frags(struct napi_struct *napi); 1612 1613 static inline void napi_free_frags(struct napi_struct *napi) 1614 { 1615 kfree_skb(napi->skb); 1616 napi->skb = NULL; 1617 } 1618 1619 extern void netif_nit_deliver(struct sk_buff *skb); 1620 extern int dev_valid_name(const char *name); 1621 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *); 1622 extern int dev_ethtool(struct net *net, struct ifreq *); 1623 extern unsigned dev_get_flags(const struct net_device *); 1624 extern int __dev_change_flags(struct net_device *, unsigned int flags); 1625 extern int dev_change_flags(struct net_device *, unsigned); 1626 extern void __dev_notify_flags(struct net_device *, unsigned int old_flags); 1627 extern int dev_change_name(struct net_device *, const char *); 1628 extern int dev_set_alias(struct net_device *, const char *, size_t); 1629 extern int dev_change_net_namespace(struct net_device *, 1630 struct net *, const char *); 1631 extern int dev_set_mtu(struct net_device *, int); 1632 extern int dev_set_mac_address(struct net_device *, 1633 struct sockaddr *); 1634 extern int dev_hard_start_xmit(struct sk_buff *skb, 1635 struct net_device *dev, 1636 struct netdev_queue *txq); 1637 extern int dev_forward_skb(struct net_device *dev, 1638 struct sk_buff *skb); 1639 1640 extern int netdev_budget; 1641 1642 /* Called by rtnetlink.c:rtnl_unlock() */ 1643 extern void netdev_run_todo(void); 1644 1645 /** 1646 * dev_put - release reference to device 1647 * @dev: network device 1648 * 1649 * Release reference to device to allow it to be freed. 1650 */ 1651 static inline void dev_put(struct net_device *dev) 1652 { 1653 atomic_dec(&dev->refcnt); 1654 } 1655 1656 /** 1657 * dev_hold - get reference to device 1658 * @dev: network device 1659 * 1660 * Hold reference to device to keep it from being freed. 1661 */ 1662 static inline void dev_hold(struct net_device *dev) 1663 { 1664 atomic_inc(&dev->refcnt); 1665 } 1666 1667 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 1668 * and _off may be called from IRQ context, but it is caller 1669 * who is responsible for serialization of these calls. 1670 * 1671 * The name carrier is inappropriate, these functions should really be 1672 * called netif_lowerlayer_*() because they represent the state of any 1673 * kind of lower layer not just hardware media. 1674 */ 1675 1676 extern void linkwatch_fire_event(struct net_device *dev); 1677 extern void linkwatch_forget_dev(struct net_device *dev); 1678 1679 /** 1680 * netif_carrier_ok - test if carrier present 1681 * @dev: network device 1682 * 1683 * Check if carrier is present on device 1684 */ 1685 static inline int netif_carrier_ok(const struct net_device *dev) 1686 { 1687 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 1688 } 1689 1690 extern unsigned long dev_trans_start(struct net_device *dev); 1691 1692 extern void __netdev_watchdog_up(struct net_device *dev); 1693 1694 extern void netif_carrier_on(struct net_device *dev); 1695 1696 extern void netif_carrier_off(struct net_device *dev); 1697 1698 /** 1699 * netif_dormant_on - mark device as dormant. 1700 * @dev: network device 1701 * 1702 * Mark device as dormant (as per RFC2863). 1703 * 1704 * The dormant state indicates that the relevant interface is not 1705 * actually in a condition to pass packets (i.e., it is not 'up') but is 1706 * in a "pending" state, waiting for some external event. For "on- 1707 * demand" interfaces, this new state identifies the situation where the 1708 * interface is waiting for events to place it in the up state. 1709 * 1710 */ 1711 static inline void netif_dormant_on(struct net_device *dev) 1712 { 1713 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 1714 linkwatch_fire_event(dev); 1715 } 1716 1717 /** 1718 * netif_dormant_off - set device as not dormant. 1719 * @dev: network device 1720 * 1721 * Device is not in dormant state. 1722 */ 1723 static inline void netif_dormant_off(struct net_device *dev) 1724 { 1725 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 1726 linkwatch_fire_event(dev); 1727 } 1728 1729 /** 1730 * netif_dormant - test if carrier present 1731 * @dev: network device 1732 * 1733 * Check if carrier is present on device 1734 */ 1735 static inline int netif_dormant(const struct net_device *dev) 1736 { 1737 return test_bit(__LINK_STATE_DORMANT, &dev->state); 1738 } 1739 1740 1741 /** 1742 * netif_oper_up - test if device is operational 1743 * @dev: network device 1744 * 1745 * Check if carrier is operational 1746 */ 1747 static inline int netif_oper_up(const struct net_device *dev) 1748 { 1749 return (dev->operstate == IF_OPER_UP || 1750 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 1751 } 1752 1753 /** 1754 * netif_device_present - is device available or removed 1755 * @dev: network device 1756 * 1757 * Check if device has not been removed from system. 1758 */ 1759 static inline int netif_device_present(struct net_device *dev) 1760 { 1761 return test_bit(__LINK_STATE_PRESENT, &dev->state); 1762 } 1763 1764 extern void netif_device_detach(struct net_device *dev); 1765 1766 extern void netif_device_attach(struct net_device *dev); 1767 1768 /* 1769 * Network interface message level settings 1770 */ 1771 #define HAVE_NETIF_MSG 1 1772 1773 enum { 1774 NETIF_MSG_DRV = 0x0001, 1775 NETIF_MSG_PROBE = 0x0002, 1776 NETIF_MSG_LINK = 0x0004, 1777 NETIF_MSG_TIMER = 0x0008, 1778 NETIF_MSG_IFDOWN = 0x0010, 1779 NETIF_MSG_IFUP = 0x0020, 1780 NETIF_MSG_RX_ERR = 0x0040, 1781 NETIF_MSG_TX_ERR = 0x0080, 1782 NETIF_MSG_TX_QUEUED = 0x0100, 1783 NETIF_MSG_INTR = 0x0200, 1784 NETIF_MSG_TX_DONE = 0x0400, 1785 NETIF_MSG_RX_STATUS = 0x0800, 1786 NETIF_MSG_PKTDATA = 0x1000, 1787 NETIF_MSG_HW = 0x2000, 1788 NETIF_MSG_WOL = 0x4000, 1789 }; 1790 1791 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 1792 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 1793 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 1794 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 1795 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 1796 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 1797 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 1798 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 1799 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 1800 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 1801 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 1802 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 1803 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 1804 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 1805 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 1806 1807 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 1808 { 1809 /* use default */ 1810 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 1811 return default_msg_enable_bits; 1812 if (debug_value == 0) /* no output */ 1813 return 0; 1814 /* set low N bits */ 1815 return (1 << debug_value) - 1; 1816 } 1817 1818 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu) 1819 { 1820 spin_lock(&txq->_xmit_lock); 1821 txq->xmit_lock_owner = cpu; 1822 } 1823 1824 static inline void __netif_tx_lock_bh(struct netdev_queue *txq) 1825 { 1826 spin_lock_bh(&txq->_xmit_lock); 1827 txq->xmit_lock_owner = smp_processor_id(); 1828 } 1829 1830 static inline int __netif_tx_trylock(struct netdev_queue *txq) 1831 { 1832 int ok = spin_trylock(&txq->_xmit_lock); 1833 if (likely(ok)) 1834 txq->xmit_lock_owner = smp_processor_id(); 1835 return ok; 1836 } 1837 1838 static inline void __netif_tx_unlock(struct netdev_queue *txq) 1839 { 1840 txq->xmit_lock_owner = -1; 1841 spin_unlock(&txq->_xmit_lock); 1842 } 1843 1844 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq) 1845 { 1846 txq->xmit_lock_owner = -1; 1847 spin_unlock_bh(&txq->_xmit_lock); 1848 } 1849 1850 static inline void txq_trans_update(struct netdev_queue *txq) 1851 { 1852 if (txq->xmit_lock_owner != -1) 1853 txq->trans_start = jiffies; 1854 } 1855 1856 /** 1857 * netif_tx_lock - grab network device transmit lock 1858 * @dev: network device 1859 * 1860 * Get network device transmit lock 1861 */ 1862 static inline void netif_tx_lock(struct net_device *dev) 1863 { 1864 unsigned int i; 1865 int cpu; 1866 1867 spin_lock(&dev->tx_global_lock); 1868 cpu = smp_processor_id(); 1869 for (i = 0; i < dev->num_tx_queues; i++) { 1870 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1871 1872 /* We are the only thread of execution doing a 1873 * freeze, but we have to grab the _xmit_lock in 1874 * order to synchronize with threads which are in 1875 * the ->hard_start_xmit() handler and already 1876 * checked the frozen bit. 1877 */ 1878 __netif_tx_lock(txq, cpu); 1879 set_bit(__QUEUE_STATE_FROZEN, &txq->state); 1880 __netif_tx_unlock(txq); 1881 } 1882 } 1883 1884 static inline void netif_tx_lock_bh(struct net_device *dev) 1885 { 1886 local_bh_disable(); 1887 netif_tx_lock(dev); 1888 } 1889 1890 static inline void netif_tx_unlock(struct net_device *dev) 1891 { 1892 unsigned int i; 1893 1894 for (i = 0; i < dev->num_tx_queues; i++) { 1895 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1896 1897 /* No need to grab the _xmit_lock here. If the 1898 * queue is not stopped for another reason, we 1899 * force a schedule. 1900 */ 1901 clear_bit(__QUEUE_STATE_FROZEN, &txq->state); 1902 netif_schedule_queue(txq); 1903 } 1904 spin_unlock(&dev->tx_global_lock); 1905 } 1906 1907 static inline void netif_tx_unlock_bh(struct net_device *dev) 1908 { 1909 netif_tx_unlock(dev); 1910 local_bh_enable(); 1911 } 1912 1913 #define HARD_TX_LOCK(dev, txq, cpu) { \ 1914 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1915 __netif_tx_lock(txq, cpu); \ 1916 } \ 1917 } 1918 1919 #define HARD_TX_UNLOCK(dev, txq) { \ 1920 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1921 __netif_tx_unlock(txq); \ 1922 } \ 1923 } 1924 1925 static inline void netif_tx_disable(struct net_device *dev) 1926 { 1927 unsigned int i; 1928 int cpu; 1929 1930 local_bh_disable(); 1931 cpu = smp_processor_id(); 1932 for (i = 0; i < dev->num_tx_queues; i++) { 1933 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1934 1935 __netif_tx_lock(txq, cpu); 1936 netif_tx_stop_queue(txq); 1937 __netif_tx_unlock(txq); 1938 } 1939 local_bh_enable(); 1940 } 1941 1942 static inline void netif_addr_lock(struct net_device *dev) 1943 { 1944 spin_lock(&dev->addr_list_lock); 1945 } 1946 1947 static inline void netif_addr_lock_bh(struct net_device *dev) 1948 { 1949 spin_lock_bh(&dev->addr_list_lock); 1950 } 1951 1952 static inline void netif_addr_unlock(struct net_device *dev) 1953 { 1954 spin_unlock(&dev->addr_list_lock); 1955 } 1956 1957 static inline void netif_addr_unlock_bh(struct net_device *dev) 1958 { 1959 spin_unlock_bh(&dev->addr_list_lock); 1960 } 1961 1962 /* 1963 * dev_addrs walker. Should be used only for read access. Call with 1964 * rcu_read_lock held. 1965 */ 1966 #define for_each_dev_addr(dev, ha) \ 1967 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list) 1968 1969 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 1970 1971 extern void ether_setup(struct net_device *dev); 1972 1973 /* Support for loadable net-drivers */ 1974 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, 1975 void (*setup)(struct net_device *), 1976 unsigned int queue_count); 1977 #define alloc_netdev(sizeof_priv, name, setup) \ 1978 alloc_netdev_mq(sizeof_priv, name, setup, 1) 1979 extern int register_netdev(struct net_device *dev); 1980 extern void unregister_netdev(struct net_device *dev); 1981 1982 /* Functions used for device addresses handling */ 1983 extern int dev_addr_add(struct net_device *dev, unsigned char *addr, 1984 unsigned char addr_type); 1985 extern int dev_addr_del(struct net_device *dev, unsigned char *addr, 1986 unsigned char addr_type); 1987 extern int dev_addr_add_multiple(struct net_device *to_dev, 1988 struct net_device *from_dev, 1989 unsigned char addr_type); 1990 extern int dev_addr_del_multiple(struct net_device *to_dev, 1991 struct net_device *from_dev, 1992 unsigned char addr_type); 1993 1994 /* Functions used for secondary unicast and multicast support */ 1995 extern void dev_set_rx_mode(struct net_device *dev); 1996 extern void __dev_set_rx_mode(struct net_device *dev); 1997 extern int dev_unicast_delete(struct net_device *dev, void *addr); 1998 extern int dev_unicast_add(struct net_device *dev, void *addr); 1999 extern int dev_unicast_sync(struct net_device *to, struct net_device *from); 2000 extern void dev_unicast_unsync(struct net_device *to, struct net_device *from); 2001 extern void dev_unicast_flush(struct net_device *dev); 2002 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all); 2003 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly); 2004 extern int dev_mc_sync(struct net_device *to, struct net_device *from); 2005 extern void dev_mc_unsync(struct net_device *to, struct net_device *from); 2006 extern void dev_addr_discard(struct net_device *dev); 2007 extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all); 2008 extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly); 2009 extern int __dev_addr_sync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count); 2010 extern void __dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count); 2011 extern int dev_set_promiscuity(struct net_device *dev, int inc); 2012 extern int dev_set_allmulti(struct net_device *dev, int inc); 2013 extern void netdev_state_change(struct net_device *dev); 2014 extern int netdev_bonding_change(struct net_device *dev, 2015 unsigned long event); 2016 extern void netdev_features_change(struct net_device *dev); 2017 /* Load a device via the kmod */ 2018 extern void dev_load(struct net *net, const char *name); 2019 extern void dev_mcast_init(void); 2020 extern const struct net_device_stats *dev_get_stats(struct net_device *dev); 2021 extern void dev_txq_stats_fold(const struct net_device *dev, struct net_device_stats *stats); 2022 2023 extern int netdev_max_backlog; 2024 extern int weight_p; 2025 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 2026 extern int skb_checksum_help(struct sk_buff *skb); 2027 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features); 2028 #ifdef CONFIG_BUG 2029 extern void netdev_rx_csum_fault(struct net_device *dev); 2030 #else 2031 static inline void netdev_rx_csum_fault(struct net_device *dev) 2032 { 2033 } 2034 #endif 2035 /* rx skb timestamps */ 2036 extern void net_enable_timestamp(void); 2037 extern void net_disable_timestamp(void); 2038 2039 #ifdef CONFIG_PROC_FS 2040 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 2041 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 2042 extern void dev_seq_stop(struct seq_file *seq, void *v); 2043 #endif 2044 2045 extern int netdev_class_create_file(struct class_attribute *class_attr); 2046 extern void netdev_class_remove_file(struct class_attribute *class_attr); 2047 2048 extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len); 2049 2050 extern void linkwatch_run_queue(void); 2051 2052 unsigned long netdev_increment_features(unsigned long all, unsigned long one, 2053 unsigned long mask); 2054 unsigned long netdev_fix_features(unsigned long features, const char *name); 2055 2056 void netif_stacked_transfer_operstate(const struct net_device *rootdev, 2057 struct net_device *dev); 2058 2059 static inline int net_gso_ok(int features, int gso_type) 2060 { 2061 int feature = gso_type << NETIF_F_GSO_SHIFT; 2062 return (features & feature) == feature; 2063 } 2064 2065 static inline int skb_gso_ok(struct sk_buff *skb, int features) 2066 { 2067 return net_gso_ok(features, skb_shinfo(skb)->gso_type) && 2068 (!skb_has_frags(skb) || (features & NETIF_F_FRAGLIST)); 2069 } 2070 2071 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb) 2072 { 2073 return skb_is_gso(skb) && 2074 (!skb_gso_ok(skb, dev->features) || 2075 unlikely(skb->ip_summed != CHECKSUM_PARTIAL)); 2076 } 2077 2078 static inline void netif_set_gso_max_size(struct net_device *dev, 2079 unsigned int size) 2080 { 2081 dev->gso_max_size = size; 2082 } 2083 2084 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb, 2085 struct net_device *master) 2086 { 2087 if (skb->pkt_type == PACKET_HOST) { 2088 u16 *dest = (u16 *) eth_hdr(skb)->h_dest; 2089 2090 memcpy(dest, master->dev_addr, ETH_ALEN); 2091 } 2092 } 2093 2094 /* On bonding slaves other than the currently active slave, suppress 2095 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and 2096 * ARP on active-backup slaves with arp_validate enabled. 2097 */ 2098 static inline int skb_bond_should_drop(struct sk_buff *skb, 2099 struct net_device *master) 2100 { 2101 if (master) { 2102 struct net_device *dev = skb->dev; 2103 2104 if (master->priv_flags & IFF_MASTER_ARPMON) 2105 dev->last_rx = jiffies; 2106 2107 if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) { 2108 /* Do address unmangle. The local destination address 2109 * will be always the one master has. Provides the right 2110 * functionality in a bridge. 2111 */ 2112 skb_bond_set_mac_by_master(skb, master); 2113 } 2114 2115 if (dev->priv_flags & IFF_SLAVE_INACTIVE) { 2116 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) && 2117 skb->protocol == __cpu_to_be16(ETH_P_ARP)) 2118 return 0; 2119 2120 if (master->priv_flags & IFF_MASTER_ALB) { 2121 if (skb->pkt_type != PACKET_BROADCAST && 2122 skb->pkt_type != PACKET_MULTICAST) 2123 return 0; 2124 } 2125 if (master->priv_flags & IFF_MASTER_8023AD && 2126 skb->protocol == __cpu_to_be16(ETH_P_SLOW)) 2127 return 0; 2128 2129 return 1; 2130 } 2131 } 2132 return 0; 2133 } 2134 2135 extern struct pernet_operations __net_initdata loopback_net_ops; 2136 2137 static inline int dev_ethtool_get_settings(struct net_device *dev, 2138 struct ethtool_cmd *cmd) 2139 { 2140 if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings) 2141 return -EOPNOTSUPP; 2142 return dev->ethtool_ops->get_settings(dev, cmd); 2143 } 2144 2145 static inline u32 dev_ethtool_get_rx_csum(struct net_device *dev) 2146 { 2147 if (!dev->ethtool_ops || !dev->ethtool_ops->get_rx_csum) 2148 return 0; 2149 return dev->ethtool_ops->get_rx_csum(dev); 2150 } 2151 2152 static inline u32 dev_ethtool_get_flags(struct net_device *dev) 2153 { 2154 if (!dev->ethtool_ops || !dev->ethtool_ops->get_flags) 2155 return 0; 2156 return dev->ethtool_ops->get_flags(dev); 2157 } 2158 2159 /* Logging, debugging and troubleshooting/diagnostic helpers. */ 2160 2161 /* netdev_printk helpers, similar to dev_printk */ 2162 2163 static inline const char *netdev_name(const struct net_device *dev) 2164 { 2165 if (dev->reg_state != NETREG_REGISTERED) 2166 return "(unregistered net_device)"; 2167 return dev->name; 2168 } 2169 2170 #define netdev_printk(level, netdev, format, args...) \ 2171 dev_printk(level, (netdev)->dev.parent, \ 2172 "%s: " format, \ 2173 netdev_name(netdev), ##args) 2174 2175 #define netdev_emerg(dev, format, args...) \ 2176 netdev_printk(KERN_EMERG, dev, format, ##args) 2177 #define netdev_alert(dev, format, args...) \ 2178 netdev_printk(KERN_ALERT, dev, format, ##args) 2179 #define netdev_crit(dev, format, args...) \ 2180 netdev_printk(KERN_CRIT, dev, format, ##args) 2181 #define netdev_err(dev, format, args...) \ 2182 netdev_printk(KERN_ERR, dev, format, ##args) 2183 #define netdev_warn(dev, format, args...) \ 2184 netdev_printk(KERN_WARNING, dev, format, ##args) 2185 #define netdev_notice(dev, format, args...) \ 2186 netdev_printk(KERN_NOTICE, dev, format, ##args) 2187 #define netdev_info(dev, format, args...) \ 2188 netdev_printk(KERN_INFO, dev, format, ##args) 2189 2190 #if defined(DEBUG) 2191 #define netdev_dbg(__dev, format, args...) \ 2192 netdev_printk(KERN_DEBUG, __dev, format, ##args) 2193 #elif defined(CONFIG_DYNAMIC_DEBUG) 2194 #define netdev_dbg(__dev, format, args...) \ 2195 do { \ 2196 dynamic_dev_dbg((__dev)->dev.parent, "%s: " format, \ 2197 netdev_name(__dev), ##args); \ 2198 } while (0) 2199 #else 2200 #define netdev_dbg(__dev, format, args...) \ 2201 ({ \ 2202 if (0) \ 2203 netdev_printk(KERN_DEBUG, __dev, format, ##args); \ 2204 0; \ 2205 }) 2206 #endif 2207 2208 #if defined(VERBOSE_DEBUG) 2209 #define netdev_vdbg netdev_dbg 2210 #else 2211 2212 #define netdev_vdbg(dev, format, args...) \ 2213 ({ \ 2214 if (0) \ 2215 netdev_printk(KERN_DEBUG, dev, format, ##args); \ 2216 0; \ 2217 }) 2218 #endif 2219 2220 /* 2221 * netdev_WARN() acts like dev_printk(), but with the key difference 2222 * of using a WARN/WARN_ON to get the message out, including the 2223 * file/line information and a backtrace. 2224 */ 2225 #define netdev_WARN(dev, format, args...) \ 2226 WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args); 2227 2228 /* netif printk helpers, similar to netdev_printk */ 2229 2230 #define netif_printk(priv, type, level, dev, fmt, args...) \ 2231 do { \ 2232 if (netif_msg_##type(priv)) \ 2233 netdev_printk(level, (dev), fmt, ##args); \ 2234 } while (0) 2235 2236 #define netif_emerg(priv, type, dev, fmt, args...) \ 2237 netif_printk(priv, type, KERN_EMERG, dev, fmt, ##args) 2238 #define netif_alert(priv, type, dev, fmt, args...) \ 2239 netif_printk(priv, type, KERN_ALERT, dev, fmt, ##args) 2240 #define netif_crit(priv, type, dev, fmt, args...) \ 2241 netif_printk(priv, type, KERN_CRIT, dev, fmt, ##args) 2242 #define netif_err(priv, type, dev, fmt, args...) \ 2243 netif_printk(priv, type, KERN_ERR, dev, fmt, ##args) 2244 #define netif_warn(priv, type, dev, fmt, args...) \ 2245 netif_printk(priv, type, KERN_WARNING, dev, fmt, ##args) 2246 #define netif_notice(priv, type, dev, fmt, args...) \ 2247 netif_printk(priv, type, KERN_NOTICE, dev, fmt, ##args) 2248 #define netif_info(priv, type, dev, fmt, args...) \ 2249 netif_printk(priv, type, KERN_INFO, (dev), fmt, ##args) 2250 2251 #if defined(DEBUG) 2252 #define netif_dbg(priv, type, dev, format, args...) \ 2253 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args) 2254 #elif defined(CONFIG_DYNAMIC_DEBUG) 2255 #define netif_dbg(priv, type, netdev, format, args...) \ 2256 do { \ 2257 if (netif_msg_##type(priv)) \ 2258 dynamic_dev_dbg((netdev)->dev.parent, \ 2259 "%s: " format, \ 2260 netdev_name(netdev), ##args); \ 2261 } while (0) 2262 #else 2263 #define netif_dbg(priv, type, dev, format, args...) \ 2264 ({ \ 2265 if (0) \ 2266 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \ 2267 0; \ 2268 }) 2269 #endif 2270 2271 #if defined(VERBOSE_DEBUG) 2272 #define netif_vdbg netdev_dbg 2273 #else 2274 #define netif_vdbg(priv, type, dev, format, args...) \ 2275 ({ \ 2276 if (0) \ 2277 netif_printk(KERN_DEBUG, dev, format, ##args); \ 2278 0; \ 2279 }) 2280 #endif 2281 2282 #endif /* __KERNEL__ */ 2283 2284 #endif /* _LINUX_NETDEVICE_H */ 2285