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