1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Definitions for the Interfaces handler. 7 * 8 * Version: @(#)dev.h 1.0.10 08/12/93 9 * 10 * Authors: Ross Biro 11 * Fred N. van Kempen, <[email protected]> 12 * Corey Minyard <[email protected]> 13 * Donald J. Becker, <[email protected]> 14 * Alan Cox, <[email protected]> 15 * Bjorn Ekwall. <[email protected]> 16 * Pekka Riikonen <[email protected]> 17 * 18 * This program is free software; you can redistribute it and/or 19 * modify it under the terms of the GNU General Public License 20 * as published by the Free Software Foundation; either version 21 * 2 of the License, or (at your option) any later version. 22 * 23 * Moved to /usr/include/linux for NET3 24 */ 25 #ifndef _LINUX_NETDEVICE_H 26 #define _LINUX_NETDEVICE_H 27 28 #include <linux/if.h> 29 #include <linux/if_ether.h> 30 #include <linux/if_packet.h> 31 #include <linux/if_link.h> 32 33 #ifdef __KERNEL__ 34 #include <linux/pm_qos_params.h> 35 #include <linux/timer.h> 36 #include <linux/delay.h> 37 #include <linux/mm.h> 38 #include <asm/atomic.h> 39 #include <asm/cache.h> 40 #include <asm/byteorder.h> 41 42 #include <linux/device.h> 43 #include <linux/percpu.h> 44 #include <linux/rculist.h> 45 #include <linux/dmaengine.h> 46 #include <linux/workqueue.h> 47 48 #include <linux/ethtool.h> 49 #include <net/net_namespace.h> 50 #include <net/dsa.h> 51 #ifdef CONFIG_DCB 52 #include <net/dcbnl.h> 53 #endif 54 55 struct vlan_group; 56 struct netpoll_info; 57 /* 802.11 specific */ 58 struct wireless_dev; 59 /* source back-compat hooks */ 60 #define SET_ETHTOOL_OPS(netdev,ops) \ 61 ( (netdev)->ethtool_ops = (ops) ) 62 63 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev 64 functions are available. */ 65 #define HAVE_FREE_NETDEV /* free_netdev() */ 66 #define HAVE_NETDEV_PRIV /* netdev_priv() */ 67 68 /* Backlog congestion levels */ 69 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */ 70 #define NET_RX_DROP 1 /* packet dropped */ 71 72 /* 73 * Transmit return codes: transmit return codes originate from three different 74 * namespaces: 75 * 76 * - qdisc return codes 77 * - driver transmit return codes 78 * - errno values 79 * 80 * Drivers are allowed to return any one of those in their hard_start_xmit() 81 * function. Real network devices commonly used with qdiscs should only return 82 * the driver transmit return codes though - when qdiscs are used, the actual 83 * transmission happens asynchronously, so the value is not propagated to 84 * higher layers. Virtual network devices transmit synchronously, in this case 85 * the driver transmit return codes are consumed by dev_queue_xmit(), all 86 * others are propagated to higher layers. 87 */ 88 89 /* qdisc ->enqueue() return codes. */ 90 #define NET_XMIT_SUCCESS 0x00 91 #define NET_XMIT_DROP 0x01 /* skb dropped */ 92 #define NET_XMIT_CN 0x02 /* congestion notification */ 93 #define NET_XMIT_POLICED 0x03 /* skb is shot by police */ 94 #define NET_XMIT_MASK 0x0f /* qdisc flags in net/sch_generic.h */ 95 96 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It 97 * indicates that the device will soon be dropping packets, or already drops 98 * some packets of the same priority; prompting us to send less aggressively. */ 99 #define net_xmit_eval(e) ((e) == NET_XMIT_CN ? 0 : (e)) 100 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0) 101 102 /* Driver transmit return codes */ 103 #define NETDEV_TX_MASK 0xf0 104 105 enum netdev_tx { 106 __NETDEV_TX_MIN = INT_MIN, /* make sure enum is signed */ 107 NETDEV_TX_OK = 0x00, /* driver took care of packet */ 108 NETDEV_TX_BUSY = 0x10, /* driver tx path was busy*/ 109 NETDEV_TX_LOCKED = 0x20, /* driver tx lock was already taken */ 110 }; 111 typedef enum netdev_tx netdev_tx_t; 112 113 /* 114 * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant; 115 * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed. 116 */ 117 static inline bool dev_xmit_complete(int rc) 118 { 119 /* 120 * Positive cases with an skb consumed by a driver: 121 * - successful transmission (rc == NETDEV_TX_OK) 122 * - error while transmitting (rc < 0) 123 * - error while queueing to a different device (rc & NET_XMIT_MASK) 124 */ 125 if (likely(rc < NET_XMIT_MASK)) 126 return true; 127 128 return false; 129 } 130 131 #endif 132 133 #define MAX_ADDR_LEN 32 /* Largest hardware address length */ 134 135 #ifdef __KERNEL__ 136 /* 137 * Compute the worst case header length according to the protocols 138 * used. 139 */ 140 141 #if defined(CONFIG_WLAN) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 142 # if defined(CONFIG_MAC80211_MESH) 143 # define LL_MAX_HEADER 128 144 # else 145 # define LL_MAX_HEADER 96 146 # endif 147 #elif defined(CONFIG_TR) || defined(CONFIG_TR_MODULE) 148 # define LL_MAX_HEADER 48 149 #else 150 # define LL_MAX_HEADER 32 151 #endif 152 153 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \ 154 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \ 155 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \ 156 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE) 157 #define MAX_HEADER LL_MAX_HEADER 158 #else 159 #define MAX_HEADER (LL_MAX_HEADER + 48) 160 #endif 161 162 #endif /* __KERNEL__ */ 163 164 /* 165 * Network device statistics. Akin to the 2.0 ether stats but 166 * with byte counters. 167 */ 168 169 struct net_device_stats { 170 unsigned long rx_packets; /* total packets received */ 171 unsigned long tx_packets; /* total packets transmitted */ 172 unsigned long rx_bytes; /* total bytes received */ 173 unsigned long tx_bytes; /* total bytes transmitted */ 174 unsigned long rx_errors; /* bad packets received */ 175 unsigned long tx_errors; /* packet transmit problems */ 176 unsigned long rx_dropped; /* no space in linux buffers */ 177 unsigned long tx_dropped; /* no space available in linux */ 178 unsigned long multicast; /* multicast packets received */ 179 unsigned long collisions; 180 181 /* detailed rx_errors: */ 182 unsigned long rx_length_errors; 183 unsigned long rx_over_errors; /* receiver ring buff overflow */ 184 unsigned long rx_crc_errors; /* recved pkt with crc error */ 185 unsigned long rx_frame_errors; /* recv'd frame alignment error */ 186 unsigned long rx_fifo_errors; /* recv'r fifo overrun */ 187 unsigned long rx_missed_errors; /* receiver missed packet */ 188 189 /* detailed tx_errors */ 190 unsigned long tx_aborted_errors; 191 unsigned long tx_carrier_errors; 192 unsigned long tx_fifo_errors; 193 unsigned long tx_heartbeat_errors; 194 unsigned long tx_window_errors; 195 196 /* for cslip etc */ 197 unsigned long rx_compressed; 198 unsigned long tx_compressed; 199 }; 200 201 202 /* Media selection options. */ 203 enum { 204 IF_PORT_UNKNOWN = 0, 205 IF_PORT_10BASE2, 206 IF_PORT_10BASET, 207 IF_PORT_AUI, 208 IF_PORT_100BASET, 209 IF_PORT_100BASETX, 210 IF_PORT_100BASEFX 211 }; 212 213 #ifdef __KERNEL__ 214 215 #include <linux/cache.h> 216 #include <linux/skbuff.h> 217 218 struct neighbour; 219 struct neigh_parms; 220 struct sk_buff; 221 222 struct netdev_hw_addr { 223 struct list_head list; 224 unsigned char addr[MAX_ADDR_LEN]; 225 unsigned char type; 226 #define NETDEV_HW_ADDR_T_LAN 1 227 #define NETDEV_HW_ADDR_T_SAN 2 228 #define NETDEV_HW_ADDR_T_SLAVE 3 229 #define NETDEV_HW_ADDR_T_UNICAST 4 230 #define NETDEV_HW_ADDR_T_MULTICAST 5 231 int refcount; 232 bool synced; 233 bool global_use; 234 struct rcu_head rcu_head; 235 }; 236 237 struct netdev_hw_addr_list { 238 struct list_head list; 239 int count; 240 }; 241 242 #define netdev_hw_addr_list_count(l) ((l)->count) 243 #define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0) 244 #define netdev_hw_addr_list_for_each(ha, l) \ 245 list_for_each_entry(ha, &(l)->list, list) 246 247 #define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc) 248 #define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc) 249 #define netdev_for_each_uc_addr(ha, dev) \ 250 netdev_hw_addr_list_for_each(ha, &(dev)->uc) 251 252 #define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc) 253 #define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc) 254 #define netdev_for_each_mc_addr(ha, dev) \ 255 netdev_hw_addr_list_for_each(ha, &(dev)->mc) 256 257 struct hh_cache { 258 struct hh_cache *hh_next; /* Next entry */ 259 atomic_t hh_refcnt; /* number of users */ 260 /* 261 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate 262 * cache line on SMP. 263 * They are mostly read, but hh_refcnt may be changed quite frequently, 264 * incurring cache line ping pongs. 265 */ 266 __be16 hh_type ____cacheline_aligned_in_smp; 267 /* protocol identifier, f.e ETH_P_IP 268 * NOTE: For VLANs, this will be the 269 * encapuslated type. --BLG 270 */ 271 u16 hh_len; /* length of header */ 272 int (*hh_output)(struct sk_buff *skb); 273 seqlock_t hh_lock; 274 275 /* cached hardware header; allow for machine alignment needs. */ 276 #define HH_DATA_MOD 16 277 #define HH_DATA_OFF(__len) \ 278 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) 279 #define HH_DATA_ALIGN(__len) \ 280 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) 281 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; 282 }; 283 284 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much. 285 * Alternative is: 286 * dev->hard_header_len ? (dev->hard_header_len + 287 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 288 * 289 * We could use other alignment values, but we must maintain the 290 * relationship HH alignment <= LL alignment. 291 * 292 * LL_ALLOCATED_SPACE also takes into account the tailroom the device 293 * may need. 294 */ 295 #define LL_RESERVED_SPACE(dev) \ 296 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 297 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 298 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 299 #define LL_ALLOCATED_SPACE(dev) \ 300 ((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 301 302 struct header_ops { 303 int (*create) (struct sk_buff *skb, struct net_device *dev, 304 unsigned short type, const void *daddr, 305 const void *saddr, unsigned len); 306 int (*parse)(const struct sk_buff *skb, unsigned char *haddr); 307 int (*rebuild)(struct sk_buff *skb); 308 #define HAVE_HEADER_CACHE 309 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh); 310 void (*cache_update)(struct hh_cache *hh, 311 const struct net_device *dev, 312 const unsigned char *haddr); 313 }; 314 315 /* These flag bits are private to the generic network queueing 316 * layer, they may not be explicitly referenced by any other 317 * code. 318 */ 319 320 enum netdev_state_t { 321 __LINK_STATE_START, 322 __LINK_STATE_PRESENT, 323 __LINK_STATE_NOCARRIER, 324 __LINK_STATE_LINKWATCH_PENDING, 325 __LINK_STATE_DORMANT, 326 }; 327 328 329 /* 330 * This structure holds at boot time configured netdevice settings. They 331 * are then used in the device probing. 332 */ 333 struct netdev_boot_setup { 334 char name[IFNAMSIZ]; 335 struct ifmap map; 336 }; 337 #define NETDEV_BOOT_SETUP_MAX 8 338 339 extern int __init netdev_boot_setup(char *str); 340 341 /* 342 * Structure for NAPI scheduling similar to tasklet but with weighting 343 */ 344 struct napi_struct { 345 /* The poll_list must only be managed by the entity which 346 * changes the state of the NAPI_STATE_SCHED bit. This means 347 * whoever atomically sets that bit can add this napi_struct 348 * to the per-cpu poll_list, and whoever clears that bit 349 * can remove from the list right before clearing the bit. 350 */ 351 struct list_head poll_list; 352 353 unsigned long state; 354 int weight; 355 int (*poll)(struct napi_struct *, int); 356 #ifdef CONFIG_NETPOLL 357 spinlock_t poll_lock; 358 int poll_owner; 359 #endif 360 361 unsigned int gro_count; 362 363 struct net_device *dev; 364 struct list_head dev_list; 365 struct sk_buff *gro_list; 366 struct sk_buff *skb; 367 }; 368 369 enum { 370 NAPI_STATE_SCHED, /* Poll is scheduled */ 371 NAPI_STATE_DISABLE, /* Disable pending */ 372 NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */ 373 }; 374 375 enum gro_result { 376 GRO_MERGED, 377 GRO_MERGED_FREE, 378 GRO_HELD, 379 GRO_NORMAL, 380 GRO_DROP, 381 }; 382 typedef enum gro_result gro_result_t; 383 384 extern void __napi_schedule(struct napi_struct *n); 385 386 static inline int napi_disable_pending(struct napi_struct *n) 387 { 388 return test_bit(NAPI_STATE_DISABLE, &n->state); 389 } 390 391 /** 392 * napi_schedule_prep - check if napi can be scheduled 393 * @n: napi context 394 * 395 * Test if NAPI routine is already running, and if not mark 396 * it as running. This is used as a condition variable 397 * insure only one NAPI poll instance runs. We also make 398 * sure there is no pending NAPI disable. 399 */ 400 static inline int napi_schedule_prep(struct napi_struct *n) 401 { 402 return !napi_disable_pending(n) && 403 !test_and_set_bit(NAPI_STATE_SCHED, &n->state); 404 } 405 406 /** 407 * napi_schedule - schedule NAPI poll 408 * @n: napi context 409 * 410 * Schedule NAPI poll routine to be called if it is not already 411 * running. 412 */ 413 static inline void napi_schedule(struct napi_struct *n) 414 { 415 if (napi_schedule_prep(n)) 416 __napi_schedule(n); 417 } 418 419 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */ 420 static inline int napi_reschedule(struct napi_struct *napi) 421 { 422 if (napi_schedule_prep(napi)) { 423 __napi_schedule(napi); 424 return 1; 425 } 426 return 0; 427 } 428 429 /** 430 * napi_complete - NAPI processing complete 431 * @n: napi context 432 * 433 * Mark NAPI processing as complete. 434 */ 435 extern void __napi_complete(struct napi_struct *n); 436 extern void napi_complete(struct napi_struct *n); 437 438 /** 439 * napi_disable - prevent NAPI from scheduling 440 * @n: napi context 441 * 442 * Stop NAPI from being scheduled on this context. 443 * Waits till any outstanding processing completes. 444 */ 445 static inline void napi_disable(struct napi_struct *n) 446 { 447 set_bit(NAPI_STATE_DISABLE, &n->state); 448 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state)) 449 msleep(1); 450 clear_bit(NAPI_STATE_DISABLE, &n->state); 451 } 452 453 /** 454 * napi_enable - enable NAPI scheduling 455 * @n: napi context 456 * 457 * Resume NAPI from being scheduled on this context. 458 * Must be paired with napi_disable. 459 */ 460 static inline void napi_enable(struct napi_struct *n) 461 { 462 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); 463 smp_mb__before_clear_bit(); 464 clear_bit(NAPI_STATE_SCHED, &n->state); 465 } 466 467 #ifdef CONFIG_SMP 468 /** 469 * napi_synchronize - wait until NAPI is not running 470 * @n: napi context 471 * 472 * Wait until NAPI is done being scheduled on this context. 473 * Waits till any outstanding processing completes but 474 * does not disable future activations. 475 */ 476 static inline void napi_synchronize(const struct napi_struct *n) 477 { 478 while (test_bit(NAPI_STATE_SCHED, &n->state)) 479 msleep(1); 480 } 481 #else 482 # define napi_synchronize(n) barrier() 483 #endif 484 485 enum netdev_queue_state_t { 486 __QUEUE_STATE_XOFF, 487 __QUEUE_STATE_FROZEN, 488 }; 489 490 struct netdev_queue { 491 /* 492 * read mostly part 493 */ 494 struct net_device *dev; 495 struct Qdisc *qdisc; 496 unsigned long state; 497 struct Qdisc *qdisc_sleeping; 498 /* 499 * write mostly part 500 */ 501 spinlock_t _xmit_lock ____cacheline_aligned_in_smp; 502 int xmit_lock_owner; 503 /* 504 * please use this field instead of dev->trans_start 505 */ 506 unsigned long trans_start; 507 unsigned long tx_bytes; 508 unsigned long tx_packets; 509 unsigned long tx_dropped; 510 } ____cacheline_aligned_in_smp; 511 512 #ifdef CONFIG_RPS 513 /* 514 * This structure holds an RPS map which can be of variable length. The 515 * map is an array of CPUs. 516 */ 517 struct rps_map { 518 unsigned int len; 519 struct rcu_head rcu; 520 u16 cpus[0]; 521 }; 522 #define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + (_num * sizeof(u16))) 523 524 /* 525 * The rps_dev_flow structure contains the mapping of a flow to a CPU and the 526 * tail pointer for that CPU's input queue at the time of last enqueue. 527 */ 528 struct rps_dev_flow { 529 u16 cpu; 530 u16 fill; 531 unsigned int last_qtail; 532 }; 533 534 /* 535 * The rps_dev_flow_table structure contains a table of flow mappings. 536 */ 537 struct rps_dev_flow_table { 538 unsigned int mask; 539 struct rcu_head rcu; 540 struct work_struct free_work; 541 struct rps_dev_flow flows[0]; 542 }; 543 #define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \ 544 (_num * sizeof(struct rps_dev_flow))) 545 546 /* 547 * The rps_sock_flow_table contains mappings of flows to the last CPU 548 * on which they were processed by the application (set in recvmsg). 549 */ 550 struct rps_sock_flow_table { 551 unsigned int mask; 552 u16 ents[0]; 553 }; 554 #define RPS_SOCK_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_sock_flow_table) + \ 555 (_num * sizeof(u16))) 556 557 #define RPS_NO_CPU 0xffff 558 559 static inline void rps_record_sock_flow(struct rps_sock_flow_table *table, 560 u32 hash) 561 { 562 if (table && hash) { 563 unsigned int cpu, index = hash & table->mask; 564 565 /* We only give a hint, preemption can change cpu under us */ 566 cpu = raw_smp_processor_id(); 567 568 if (table->ents[index] != cpu) 569 table->ents[index] = cpu; 570 } 571 } 572 573 static inline void rps_reset_sock_flow(struct rps_sock_flow_table *table, 574 u32 hash) 575 { 576 if (table && hash) 577 table->ents[hash & table->mask] = RPS_NO_CPU; 578 } 579 580 extern struct rps_sock_flow_table *rps_sock_flow_table; 581 582 /* This structure contains an instance of an RX queue. */ 583 struct netdev_rx_queue { 584 struct rps_map *rps_map; 585 struct rps_dev_flow_table *rps_flow_table; 586 struct kobject kobj; 587 struct netdev_rx_queue *first; 588 atomic_t count; 589 } ____cacheline_aligned_in_smp; 590 #endif /* CONFIG_RPS */ 591 592 /* 593 * This structure defines the management hooks for network devices. 594 * The following hooks can be defined; unless noted otherwise, they are 595 * optional and can be filled with a null pointer. 596 * 597 * int (*ndo_init)(struct net_device *dev); 598 * This function is called once when network device is registered. 599 * The network device can use this to any late stage initializaton 600 * or semantic validattion. It can fail with an error code which will 601 * be propogated back to register_netdev 602 * 603 * void (*ndo_uninit)(struct net_device *dev); 604 * This function is called when device is unregistered or when registration 605 * fails. It is not called if init fails. 606 * 607 * int (*ndo_open)(struct net_device *dev); 608 * This function is called when network device transistions to the up 609 * state. 610 * 611 * int (*ndo_stop)(struct net_device *dev); 612 * This function is called when network device transistions to the down 613 * state. 614 * 615 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb, 616 * struct net_device *dev); 617 * Called when a packet needs to be transmitted. 618 * Must return NETDEV_TX_OK , NETDEV_TX_BUSY. 619 * (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX) 620 * Required can not be NULL. 621 * 622 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb); 623 * Called to decide which queue to when device supports multiple 624 * transmit queues. 625 * 626 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags); 627 * This function is called to allow device receiver to make 628 * changes to configuration when multicast or promiscious is enabled. 629 * 630 * void (*ndo_set_rx_mode)(struct net_device *dev); 631 * This function is called device changes address list filtering. 632 * 633 * void (*ndo_set_multicast_list)(struct net_device *dev); 634 * This function is called when the multicast address list changes. 635 * 636 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr); 637 * This function is called when the Media Access Control address 638 * needs to be changed. If this interface is not defined, the 639 * mac address can not be changed. 640 * 641 * int (*ndo_validate_addr)(struct net_device *dev); 642 * Test if Media Access Control address is valid for the device. 643 * 644 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd); 645 * Called when a user request an ioctl which can't be handled by 646 * the generic interface code. If not defined ioctl's return 647 * not supported error code. 648 * 649 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map); 650 * Used to set network devices bus interface parameters. This interface 651 * is retained for legacy reason, new devices should use the bus 652 * interface (PCI) for low level management. 653 * 654 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu); 655 * Called when a user wants to change the Maximum Transfer Unit 656 * of a device. If not defined, any request to change MTU will 657 * will return an error. 658 * 659 * void (*ndo_tx_timeout)(struct net_device *dev); 660 * Callback uses when the transmitter has not made any progress 661 * for dev->watchdog ticks. 662 * 663 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev); 664 * Called when a user wants to get the network device usage 665 * statistics. If not defined, the counters in dev->stats will 666 * be used. 667 * 668 * void (*ndo_vlan_rx_register)(struct net_device *dev, struct vlan_group *grp); 669 * If device support VLAN receive accleration 670 * (ie. dev->features & NETIF_F_HW_VLAN_RX), then this function is called 671 * when vlan groups for the device changes. Note: grp is NULL 672 * if no vlan's groups are being used. 673 * 674 * void (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid); 675 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER) 676 * this function is called when a VLAN id is registered. 677 * 678 * void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid); 679 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER) 680 * this function is called when a VLAN id is unregistered. 681 * 682 * void (*ndo_poll_controller)(struct net_device *dev); 683 * 684 * SR-IOV management functions. 685 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac); 686 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos); 687 * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate); 688 * int (*ndo_get_vf_config)(struct net_device *dev, 689 * int vf, struct ifla_vf_info *ivf); 690 * int (*ndo_set_vf_port)(struct net_device *dev, int vf, 691 * struct nlattr *port[]); 692 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb); 693 */ 694 #define HAVE_NET_DEVICE_OPS 695 struct net_device_ops { 696 int (*ndo_init)(struct net_device *dev); 697 void (*ndo_uninit)(struct net_device *dev); 698 int (*ndo_open)(struct net_device *dev); 699 int (*ndo_stop)(struct net_device *dev); 700 netdev_tx_t (*ndo_start_xmit) (struct sk_buff *skb, 701 struct net_device *dev); 702 u16 (*ndo_select_queue)(struct net_device *dev, 703 struct sk_buff *skb); 704 void (*ndo_change_rx_flags)(struct net_device *dev, 705 int flags); 706 void (*ndo_set_rx_mode)(struct net_device *dev); 707 void (*ndo_set_multicast_list)(struct net_device *dev); 708 int (*ndo_set_mac_address)(struct net_device *dev, 709 void *addr); 710 int (*ndo_validate_addr)(struct net_device *dev); 711 int (*ndo_do_ioctl)(struct net_device *dev, 712 struct ifreq *ifr, int cmd); 713 int (*ndo_set_config)(struct net_device *dev, 714 struct ifmap *map); 715 int (*ndo_change_mtu)(struct net_device *dev, 716 int new_mtu); 717 int (*ndo_neigh_setup)(struct net_device *dev, 718 struct neigh_parms *); 719 void (*ndo_tx_timeout) (struct net_device *dev); 720 721 struct net_device_stats* (*ndo_get_stats)(struct net_device *dev); 722 723 void (*ndo_vlan_rx_register)(struct net_device *dev, 724 struct vlan_group *grp); 725 void (*ndo_vlan_rx_add_vid)(struct net_device *dev, 726 unsigned short vid); 727 void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, 728 unsigned short vid); 729 #ifdef CONFIG_NET_POLL_CONTROLLER 730 void (*ndo_poll_controller)(struct net_device *dev); 731 void (*ndo_netpoll_cleanup)(struct net_device *dev); 732 #endif 733 int (*ndo_set_vf_mac)(struct net_device *dev, 734 int queue, u8 *mac); 735 int (*ndo_set_vf_vlan)(struct net_device *dev, 736 int queue, u16 vlan, u8 qos); 737 int (*ndo_set_vf_tx_rate)(struct net_device *dev, 738 int vf, int rate); 739 int (*ndo_get_vf_config)(struct net_device *dev, 740 int vf, 741 struct ifla_vf_info *ivf); 742 int (*ndo_set_vf_port)(struct net_device *dev, 743 int vf, 744 struct nlattr *port[]); 745 int (*ndo_get_vf_port)(struct net_device *dev, 746 int vf, struct sk_buff *skb); 747 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 748 int (*ndo_fcoe_enable)(struct net_device *dev); 749 int (*ndo_fcoe_disable)(struct net_device *dev); 750 int (*ndo_fcoe_ddp_setup)(struct net_device *dev, 751 u16 xid, 752 struct scatterlist *sgl, 753 unsigned int sgc); 754 int (*ndo_fcoe_ddp_done)(struct net_device *dev, 755 u16 xid); 756 #define NETDEV_FCOE_WWNN 0 757 #define NETDEV_FCOE_WWPN 1 758 int (*ndo_fcoe_get_wwn)(struct net_device *dev, 759 u64 *wwn, int type); 760 #endif 761 }; 762 763 /* 764 * The DEVICE structure. 765 * Actually, this whole structure is a big mistake. It mixes I/O 766 * data with strictly "high-level" data, and it has to know about 767 * almost every data structure used in the INET module. 768 * 769 * FIXME: cleanup struct net_device such that network protocol info 770 * moves out. 771 */ 772 773 struct net_device { 774 775 /* 776 * This is the first field of the "visible" part of this structure 777 * (i.e. as seen by users in the "Space.c" file). It is the name 778 * the interface. 779 */ 780 char name[IFNAMSIZ]; 781 782 struct pm_qos_request_list *pm_qos_req; 783 784 /* device name hash chain */ 785 struct hlist_node name_hlist; 786 /* snmp alias */ 787 char *ifalias; 788 789 /* 790 * I/O specific fields 791 * FIXME: Merge these and struct ifmap into one 792 */ 793 unsigned long mem_end; /* shared mem end */ 794 unsigned long mem_start; /* shared mem start */ 795 unsigned long base_addr; /* device I/O address */ 796 unsigned int irq; /* device IRQ number */ 797 798 /* 799 * Some hardware also needs these fields, but they are not 800 * part of the usual set specified in Space.c. 801 */ 802 803 unsigned char if_port; /* Selectable AUI, TP,..*/ 804 unsigned char dma; /* DMA channel */ 805 806 unsigned long state; 807 808 struct list_head dev_list; 809 struct list_head napi_list; 810 struct list_head unreg_list; 811 812 /* Net device features */ 813 unsigned long features; 814 #define NETIF_F_SG 1 /* Scatter/gather IO. */ 815 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */ 816 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ 817 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ 818 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */ 819 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ 820 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ 821 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ 822 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ 823 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ 824 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ 825 #define NETIF_F_GSO 2048 /* Enable software GSO. */ 826 #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */ 827 /* do not use LLTX in new drivers */ 828 #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */ 829 #define NETIF_F_GRO 16384 /* Generic receive offload */ 830 #define NETIF_F_LRO 32768 /* large receive offload */ 831 832 /* the GSO_MASK reserves bits 16 through 23 */ 833 #define NETIF_F_FCOE_CRC (1 << 24) /* FCoE CRC32 */ 834 #define NETIF_F_SCTP_CSUM (1 << 25) /* SCTP checksum offload */ 835 #define NETIF_F_FCOE_MTU (1 << 26) /* Supports max FCoE MTU, 2158 bytes*/ 836 #define NETIF_F_NTUPLE (1 << 27) /* N-tuple filters supported */ 837 #define NETIF_F_RXHASH (1 << 28) /* Receive hashing offload */ 838 839 /* Segmentation offload features */ 840 #define NETIF_F_GSO_SHIFT 16 841 #define NETIF_F_GSO_MASK 0x00ff0000 842 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT) 843 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT) 844 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT) 845 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT) 846 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT) 847 #define NETIF_F_FSO (SKB_GSO_FCOE << NETIF_F_GSO_SHIFT) 848 849 /* List of features with software fallbacks. */ 850 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6) 851 852 853 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM) 854 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM) 855 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM) 856 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM) 857 858 /* 859 * If one device supports one of these features, then enable them 860 * for all in netdev_increment_features. 861 */ 862 #define NETIF_F_ONE_FOR_ALL (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \ 863 NETIF_F_SG | NETIF_F_HIGHDMA | \ 864 NETIF_F_FRAGLIST) 865 866 /* Interface index. Unique device identifier */ 867 int ifindex; 868 int iflink; 869 870 struct net_device_stats stats; 871 872 #ifdef CONFIG_WIRELESS_EXT 873 /* List of functions to handle Wireless Extensions (instead of ioctl). 874 * See <net/iw_handler.h> for details. Jean II */ 875 const struct iw_handler_def * wireless_handlers; 876 /* Instance data managed by the core of Wireless Extensions. */ 877 struct iw_public_data * wireless_data; 878 #endif 879 /* Management operations */ 880 const struct net_device_ops *netdev_ops; 881 const struct ethtool_ops *ethtool_ops; 882 883 /* Hardware header description */ 884 const struct header_ops *header_ops; 885 886 unsigned int flags; /* interface flags (a la BSD) */ 887 unsigned short gflags; 888 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ 889 unsigned short padded; /* How much padding added by alloc_netdev() */ 890 891 unsigned char operstate; /* RFC2863 operstate */ 892 unsigned char link_mode; /* mapping policy to operstate */ 893 894 unsigned int mtu; /* interface MTU value */ 895 unsigned short type; /* interface hardware type */ 896 unsigned short hard_header_len; /* hardware hdr length */ 897 898 /* extra head- and tailroom the hardware may need, but not in all cases 899 * can this be guaranteed, especially tailroom. Some cases also use 900 * LL_MAX_HEADER instead to allocate the skb. 901 */ 902 unsigned short needed_headroom; 903 unsigned short needed_tailroom; 904 905 struct net_device *master; /* Pointer to master device of a group, 906 * which this device is member of. 907 */ 908 909 /* Interface address info. */ 910 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ 911 unsigned char addr_len; /* hardware address length */ 912 unsigned short dev_id; /* for shared network cards */ 913 914 spinlock_t addr_list_lock; 915 struct netdev_hw_addr_list uc; /* Unicast mac addresses */ 916 struct netdev_hw_addr_list mc; /* Multicast mac addresses */ 917 int uc_promisc; 918 unsigned int promiscuity; 919 unsigned int allmulti; 920 921 922 /* Protocol specific pointers */ 923 924 #ifdef CONFIG_NET_DSA 925 void *dsa_ptr; /* dsa specific data */ 926 #endif 927 void *atalk_ptr; /* AppleTalk link */ 928 void *ip_ptr; /* IPv4 specific data */ 929 void *dn_ptr; /* DECnet specific data */ 930 void *ip6_ptr; /* IPv6 specific data */ 931 void *ec_ptr; /* Econet specific data */ 932 void *ax25_ptr; /* AX.25 specific data */ 933 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data, 934 assign before registering */ 935 936 /* 937 * Cache line mostly used on receive path (including eth_type_trans()) 938 */ 939 unsigned long last_rx; /* Time of last Rx */ 940 /* Interface address info used in eth_type_trans() */ 941 unsigned char *dev_addr; /* hw address, (before bcast 942 because most packets are 943 unicast) */ 944 945 struct netdev_hw_addr_list dev_addrs; /* list of device 946 hw addresses */ 947 948 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 949 950 #ifdef CONFIG_RPS 951 struct kset *queues_kset; 952 953 struct netdev_rx_queue *_rx; 954 955 /* Number of RX queues allocated at alloc_netdev_mq() time */ 956 unsigned int num_rx_queues; 957 #endif 958 959 struct netdev_queue rx_queue; 960 961 struct netdev_queue *_tx ____cacheline_aligned_in_smp; 962 963 /* Number of TX queues allocated at alloc_netdev_mq() time */ 964 unsigned int num_tx_queues; 965 966 /* Number of TX queues currently active in device */ 967 unsigned int real_num_tx_queues; 968 969 /* root qdisc from userspace point of view */ 970 struct Qdisc *qdisc; 971 972 unsigned long tx_queue_len; /* Max frames per queue allowed */ 973 spinlock_t tx_global_lock; 974 /* 975 * One part is mostly used on xmit path (device) 976 */ 977 /* These may be needed for future network-power-down code. */ 978 979 /* 980 * trans_start here is expensive for high speed devices on SMP, 981 * please use netdev_queue->trans_start instead. 982 */ 983 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 984 985 int watchdog_timeo; /* used by dev_watchdog() */ 986 struct timer_list watchdog_timer; 987 988 /* Number of references to this device */ 989 atomic_t refcnt ____cacheline_aligned_in_smp; 990 991 /* delayed register/unregister */ 992 struct list_head todo_list; 993 /* device index hash chain */ 994 struct hlist_node index_hlist; 995 996 struct list_head link_watch_list; 997 998 /* register/unregister state machine */ 999 enum { NETREG_UNINITIALIZED=0, 1000 NETREG_REGISTERED, /* completed register_netdevice */ 1001 NETREG_UNREGISTERING, /* called unregister_netdevice */ 1002 NETREG_UNREGISTERED, /* completed unregister todo */ 1003 NETREG_RELEASED, /* called free_netdev */ 1004 NETREG_DUMMY, /* dummy device for NAPI poll */ 1005 } reg_state:16; 1006 1007 enum { 1008 RTNL_LINK_INITIALIZED, 1009 RTNL_LINK_INITIALIZING, 1010 } rtnl_link_state:16; 1011 1012 /* Called from unregister, can be used to call free_netdev */ 1013 void (*destructor)(struct net_device *dev); 1014 1015 #ifdef CONFIG_NETPOLL 1016 struct netpoll_info *npinfo; 1017 #endif 1018 1019 #ifdef CONFIG_NET_NS 1020 /* Network namespace this network device is inside */ 1021 struct net *nd_net; 1022 #endif 1023 1024 /* mid-layer private */ 1025 void *ml_priv; 1026 1027 /* bridge stuff */ 1028 struct net_bridge_port *br_port; 1029 /* macvlan */ 1030 struct macvlan_port *macvlan_port; 1031 /* GARP */ 1032 struct garp_port *garp_port; 1033 1034 /* class/net/name entry */ 1035 struct device dev; 1036 /* space for optional device, statistics, and wireless sysfs groups */ 1037 const struct attribute_group *sysfs_groups[4]; 1038 1039 /* rtnetlink link ops */ 1040 const struct rtnl_link_ops *rtnl_link_ops; 1041 1042 /* VLAN feature mask */ 1043 unsigned long vlan_features; 1044 1045 /* for setting kernel sock attribute on TCP connection setup */ 1046 #define GSO_MAX_SIZE 65536 1047 unsigned int gso_max_size; 1048 1049 #ifdef CONFIG_DCB 1050 /* Data Center Bridging netlink ops */ 1051 const struct dcbnl_rtnl_ops *dcbnl_ops; 1052 #endif 1053 1054 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 1055 /* max exchange id for FCoE LRO by ddp */ 1056 unsigned int fcoe_ddp_xid; 1057 #endif 1058 /* n-tuple filter list attached to this device */ 1059 struct ethtool_rx_ntuple_list ethtool_ntuple_list; 1060 }; 1061 #define to_net_dev(d) container_of(d, struct net_device, dev) 1062 1063 #define NETDEV_ALIGN 32 1064 1065 static inline 1066 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev, 1067 unsigned int index) 1068 { 1069 return &dev->_tx[index]; 1070 } 1071 1072 static inline void netdev_for_each_tx_queue(struct net_device *dev, 1073 void (*f)(struct net_device *, 1074 struct netdev_queue *, 1075 void *), 1076 void *arg) 1077 { 1078 unsigned int i; 1079 1080 for (i = 0; i < dev->num_tx_queues; i++) 1081 f(dev, &dev->_tx[i], arg); 1082 } 1083 1084 /* 1085 * Net namespace inlines 1086 */ 1087 static inline 1088 struct net *dev_net(const struct net_device *dev) 1089 { 1090 #ifdef CONFIG_NET_NS 1091 return dev->nd_net; 1092 #else 1093 return &init_net; 1094 #endif 1095 } 1096 1097 static inline 1098 void dev_net_set(struct net_device *dev, struct net *net) 1099 { 1100 #ifdef CONFIG_NET_NS 1101 release_net(dev->nd_net); 1102 dev->nd_net = hold_net(net); 1103 #endif 1104 } 1105 1106 static inline bool netdev_uses_dsa_tags(struct net_device *dev) 1107 { 1108 #ifdef CONFIG_NET_DSA_TAG_DSA 1109 if (dev->dsa_ptr != NULL) 1110 return dsa_uses_dsa_tags(dev->dsa_ptr); 1111 #endif 1112 1113 return 0; 1114 } 1115 1116 #ifndef CONFIG_NET_NS 1117 static inline void skb_set_dev(struct sk_buff *skb, struct net_device *dev) 1118 { 1119 skb->dev = dev; 1120 } 1121 #else /* CONFIG_NET_NS */ 1122 void skb_set_dev(struct sk_buff *skb, struct net_device *dev); 1123 #endif 1124 1125 static inline bool netdev_uses_trailer_tags(struct net_device *dev) 1126 { 1127 #ifdef CONFIG_NET_DSA_TAG_TRAILER 1128 if (dev->dsa_ptr != NULL) 1129 return dsa_uses_trailer_tags(dev->dsa_ptr); 1130 #endif 1131 1132 return 0; 1133 } 1134 1135 /** 1136 * netdev_priv - access network device private data 1137 * @dev: network device 1138 * 1139 * Get network device private data 1140 */ 1141 static inline void *netdev_priv(const struct net_device *dev) 1142 { 1143 return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN); 1144 } 1145 1146 /* Set the sysfs physical device reference for the network logical device 1147 * if set prior to registration will cause a symlink during initialization. 1148 */ 1149 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) 1150 1151 /* Set the sysfs device type for the network logical device to allow 1152 * fin grained indentification of different network device types. For 1153 * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc. 1154 */ 1155 #define SET_NETDEV_DEVTYPE(net, devtype) ((net)->dev.type = (devtype)) 1156 1157 /** 1158 * netif_napi_add - initialize a napi context 1159 * @dev: network device 1160 * @napi: napi context 1161 * @poll: polling function 1162 * @weight: default weight 1163 * 1164 * netif_napi_add() must be used to initialize a napi context prior to calling 1165 * *any* of the other napi related functions. 1166 */ 1167 void netif_napi_add(struct net_device *dev, struct napi_struct *napi, 1168 int (*poll)(struct napi_struct *, int), int weight); 1169 1170 /** 1171 * netif_napi_del - remove a napi context 1172 * @napi: napi context 1173 * 1174 * netif_napi_del() removes a napi context from the network device napi list 1175 */ 1176 void netif_napi_del(struct napi_struct *napi); 1177 1178 struct napi_gro_cb { 1179 /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */ 1180 void *frag0; 1181 1182 /* Length of frag0. */ 1183 unsigned int frag0_len; 1184 1185 /* This indicates where we are processing relative to skb->data. */ 1186 int data_offset; 1187 1188 /* This is non-zero if the packet may be of the same flow. */ 1189 int same_flow; 1190 1191 /* This is non-zero if the packet cannot be merged with the new skb. */ 1192 int flush; 1193 1194 /* Number of segments aggregated. */ 1195 int count; 1196 1197 /* Free the skb? */ 1198 int free; 1199 }; 1200 1201 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb) 1202 1203 struct packet_type { 1204 __be16 type; /* This is really htons(ether_type). */ 1205 struct net_device *dev; /* NULL is wildcarded here */ 1206 int (*func) (struct sk_buff *, 1207 struct net_device *, 1208 struct packet_type *, 1209 struct net_device *); 1210 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 1211 int features); 1212 int (*gso_send_check)(struct sk_buff *skb); 1213 struct sk_buff **(*gro_receive)(struct sk_buff **head, 1214 struct sk_buff *skb); 1215 int (*gro_complete)(struct sk_buff *skb); 1216 void *af_packet_priv; 1217 struct list_head list; 1218 }; 1219 1220 #include <linux/interrupt.h> 1221 #include <linux/notifier.h> 1222 1223 extern rwlock_t dev_base_lock; /* Device list lock */ 1224 1225 1226 #define for_each_netdev(net, d) \ 1227 list_for_each_entry(d, &(net)->dev_base_head, dev_list) 1228 #define for_each_netdev_reverse(net, d) \ 1229 list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list) 1230 #define for_each_netdev_rcu(net, d) \ 1231 list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list) 1232 #define for_each_netdev_safe(net, d, n) \ 1233 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list) 1234 #define for_each_netdev_continue(net, d) \ 1235 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list) 1236 #define for_each_netdev_continue_rcu(net, d) \ 1237 list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list) 1238 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) 1239 1240 static inline struct net_device *next_net_device(struct net_device *dev) 1241 { 1242 struct list_head *lh; 1243 struct net *net; 1244 1245 net = dev_net(dev); 1246 lh = dev->dev_list.next; 1247 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 1248 } 1249 1250 static inline struct net_device *next_net_device_rcu(struct net_device *dev) 1251 { 1252 struct list_head *lh; 1253 struct net *net; 1254 1255 net = dev_net(dev); 1256 lh = rcu_dereference(dev->dev_list.next); 1257 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 1258 } 1259 1260 static inline struct net_device *first_net_device(struct net *net) 1261 { 1262 return list_empty(&net->dev_base_head) ? NULL : 1263 net_device_entry(net->dev_base_head.next); 1264 } 1265 1266 extern int netdev_boot_setup_check(struct net_device *dev); 1267 extern unsigned long netdev_boot_base(const char *prefix, int unit); 1268 extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr); 1269 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type); 1270 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type); 1271 extern void dev_add_pack(struct packet_type *pt); 1272 extern void dev_remove_pack(struct packet_type *pt); 1273 extern void __dev_remove_pack(struct packet_type *pt); 1274 1275 extern struct net_device *dev_get_by_flags(struct net *net, unsigned short flags, 1276 unsigned short mask); 1277 extern struct net_device *dev_get_by_name(struct net *net, const char *name); 1278 extern struct net_device *dev_get_by_name_rcu(struct net *net, const char *name); 1279 extern struct net_device *__dev_get_by_name(struct net *net, const char *name); 1280 extern int dev_alloc_name(struct net_device *dev, const char *name); 1281 extern int dev_open(struct net_device *dev); 1282 extern int dev_close(struct net_device *dev); 1283 extern void dev_disable_lro(struct net_device *dev); 1284 extern int dev_queue_xmit(struct sk_buff *skb); 1285 extern int register_netdevice(struct net_device *dev); 1286 extern void unregister_netdevice_queue(struct net_device *dev, 1287 struct list_head *head); 1288 extern void unregister_netdevice_many(struct list_head *head); 1289 static inline void unregister_netdevice(struct net_device *dev) 1290 { 1291 unregister_netdevice_queue(dev, NULL); 1292 } 1293 1294 extern void free_netdev(struct net_device *dev); 1295 extern void synchronize_net(void); 1296 extern int register_netdevice_notifier(struct notifier_block *nb); 1297 extern int unregister_netdevice_notifier(struct notifier_block *nb); 1298 extern int init_dummy_netdev(struct net_device *dev); 1299 extern void netdev_resync_ops(struct net_device *dev); 1300 1301 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev); 1302 extern struct net_device *dev_get_by_index(struct net *net, int ifindex); 1303 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex); 1304 extern struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex); 1305 extern int dev_restart(struct net_device *dev); 1306 #ifdef CONFIG_NETPOLL_TRAP 1307 extern int netpoll_trap(void); 1308 #endif 1309 extern int skb_gro_receive(struct sk_buff **head, 1310 struct sk_buff *skb); 1311 extern void skb_gro_reset_offset(struct sk_buff *skb); 1312 1313 static inline unsigned int skb_gro_offset(const struct sk_buff *skb) 1314 { 1315 return NAPI_GRO_CB(skb)->data_offset; 1316 } 1317 1318 static inline unsigned int skb_gro_len(const struct sk_buff *skb) 1319 { 1320 return skb->len - NAPI_GRO_CB(skb)->data_offset; 1321 } 1322 1323 static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len) 1324 { 1325 NAPI_GRO_CB(skb)->data_offset += len; 1326 } 1327 1328 static inline void *skb_gro_header_fast(struct sk_buff *skb, 1329 unsigned int offset) 1330 { 1331 return NAPI_GRO_CB(skb)->frag0 + offset; 1332 } 1333 1334 static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen) 1335 { 1336 return NAPI_GRO_CB(skb)->frag0_len < hlen; 1337 } 1338 1339 static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen, 1340 unsigned int offset) 1341 { 1342 NAPI_GRO_CB(skb)->frag0 = NULL; 1343 NAPI_GRO_CB(skb)->frag0_len = 0; 1344 return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL; 1345 } 1346 1347 static inline void *skb_gro_mac_header(struct sk_buff *skb) 1348 { 1349 return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb); 1350 } 1351 1352 static inline void *skb_gro_network_header(struct sk_buff *skb) 1353 { 1354 return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) + 1355 skb_network_offset(skb); 1356 } 1357 1358 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, 1359 unsigned short type, 1360 const void *daddr, const void *saddr, 1361 unsigned len) 1362 { 1363 if (!dev->header_ops || !dev->header_ops->create) 1364 return 0; 1365 1366 return dev->header_ops->create(skb, dev, type, daddr, saddr, len); 1367 } 1368 1369 static inline int dev_parse_header(const struct sk_buff *skb, 1370 unsigned char *haddr) 1371 { 1372 const struct net_device *dev = skb->dev; 1373 1374 if (!dev->header_ops || !dev->header_ops->parse) 1375 return 0; 1376 return dev->header_ops->parse(skb, haddr); 1377 } 1378 1379 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 1380 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 1381 static inline int unregister_gifconf(unsigned int family) 1382 { 1383 return register_gifconf(family, NULL); 1384 } 1385 1386 /* 1387 * Incoming packets are placed on per-cpu queues 1388 */ 1389 struct softnet_data { 1390 struct Qdisc *output_queue; 1391 struct Qdisc **output_queue_tailp; 1392 struct list_head poll_list; 1393 struct sk_buff *completion_queue; 1394 struct sk_buff_head process_queue; 1395 1396 /* stats */ 1397 unsigned int processed; 1398 unsigned int time_squeeze; 1399 unsigned int cpu_collision; 1400 unsigned int received_rps; 1401 1402 #ifdef CONFIG_RPS 1403 struct softnet_data *rps_ipi_list; 1404 1405 /* Elements below can be accessed between CPUs for RPS */ 1406 struct call_single_data csd ____cacheline_aligned_in_smp; 1407 struct softnet_data *rps_ipi_next; 1408 unsigned int cpu; 1409 unsigned int input_queue_head; 1410 #endif 1411 unsigned dropped; 1412 struct sk_buff_head input_pkt_queue; 1413 struct napi_struct backlog; 1414 }; 1415 1416 static inline void input_queue_head_add(struct softnet_data *sd, 1417 unsigned int len) 1418 { 1419 #ifdef CONFIG_RPS 1420 sd->input_queue_head += len; 1421 #endif 1422 } 1423 1424 DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); 1425 1426 #define HAVE_NETIF_QUEUE 1427 1428 extern void __netif_schedule(struct Qdisc *q); 1429 1430 static inline void netif_schedule_queue(struct netdev_queue *txq) 1431 { 1432 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state)) 1433 __netif_schedule(txq->qdisc); 1434 } 1435 1436 static inline void netif_tx_schedule_all(struct net_device *dev) 1437 { 1438 unsigned int i; 1439 1440 for (i = 0; i < dev->num_tx_queues; i++) 1441 netif_schedule_queue(netdev_get_tx_queue(dev, i)); 1442 } 1443 1444 static inline void netif_tx_start_queue(struct netdev_queue *dev_queue) 1445 { 1446 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1447 } 1448 1449 /** 1450 * netif_start_queue - allow transmit 1451 * @dev: network device 1452 * 1453 * Allow upper layers to call the device hard_start_xmit routine. 1454 */ 1455 static inline void netif_start_queue(struct net_device *dev) 1456 { 1457 netif_tx_start_queue(netdev_get_tx_queue(dev, 0)); 1458 } 1459 1460 static inline void netif_tx_start_all_queues(struct net_device *dev) 1461 { 1462 unsigned int i; 1463 1464 for (i = 0; i < dev->num_tx_queues; i++) { 1465 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1466 netif_tx_start_queue(txq); 1467 } 1468 } 1469 1470 static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue) 1471 { 1472 #ifdef CONFIG_NETPOLL_TRAP 1473 if (netpoll_trap()) { 1474 netif_tx_start_queue(dev_queue); 1475 return; 1476 } 1477 #endif 1478 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state)) 1479 __netif_schedule(dev_queue->qdisc); 1480 } 1481 1482 /** 1483 * netif_wake_queue - restart transmit 1484 * @dev: network device 1485 * 1486 * Allow upper layers to call the device hard_start_xmit routine. 1487 * Used for flow control when transmit resources are available. 1488 */ 1489 static inline void netif_wake_queue(struct net_device *dev) 1490 { 1491 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0)); 1492 } 1493 1494 static inline void netif_tx_wake_all_queues(struct net_device *dev) 1495 { 1496 unsigned int i; 1497 1498 for (i = 0; i < dev->num_tx_queues; i++) { 1499 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1500 netif_tx_wake_queue(txq); 1501 } 1502 } 1503 1504 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue) 1505 { 1506 set_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1507 } 1508 1509 /** 1510 * netif_stop_queue - stop transmitted packets 1511 * @dev: network device 1512 * 1513 * Stop upper layers calling the device hard_start_xmit routine. 1514 * Used for flow control when transmit resources are unavailable. 1515 */ 1516 static inline void netif_stop_queue(struct net_device *dev) 1517 { 1518 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0)); 1519 } 1520 1521 static inline void netif_tx_stop_all_queues(struct net_device *dev) 1522 { 1523 unsigned int i; 1524 1525 for (i = 0; i < dev->num_tx_queues; i++) { 1526 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1527 netif_tx_stop_queue(txq); 1528 } 1529 } 1530 1531 static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue) 1532 { 1533 return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1534 } 1535 1536 /** 1537 * netif_queue_stopped - test if transmit queue is flowblocked 1538 * @dev: network device 1539 * 1540 * Test if transmit queue on device is currently unable to send. 1541 */ 1542 static inline int netif_queue_stopped(const struct net_device *dev) 1543 { 1544 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0)); 1545 } 1546 1547 static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue) 1548 { 1549 return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state); 1550 } 1551 1552 /** 1553 * netif_running - test if up 1554 * @dev: network device 1555 * 1556 * Test if the device has been brought up. 1557 */ 1558 static inline int netif_running(const struct net_device *dev) 1559 { 1560 return test_bit(__LINK_STATE_START, &dev->state); 1561 } 1562 1563 /* 1564 * Routines to manage the subqueues on a device. We only need start 1565 * stop, and a check if it's stopped. All other device management is 1566 * done at the overall netdevice level. 1567 * Also test the device if we're multiqueue. 1568 */ 1569 1570 /** 1571 * netif_start_subqueue - allow sending packets on subqueue 1572 * @dev: network device 1573 * @queue_index: sub queue index 1574 * 1575 * Start individual transmit queue of a device with multiple transmit queues. 1576 */ 1577 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 1578 { 1579 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1580 1581 netif_tx_start_queue(txq); 1582 } 1583 1584 /** 1585 * netif_stop_subqueue - stop sending packets on subqueue 1586 * @dev: network device 1587 * @queue_index: sub queue index 1588 * 1589 * Stop individual transmit queue of a device with multiple transmit queues. 1590 */ 1591 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 1592 { 1593 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1594 #ifdef CONFIG_NETPOLL_TRAP 1595 if (netpoll_trap()) 1596 return; 1597 #endif 1598 netif_tx_stop_queue(txq); 1599 } 1600 1601 /** 1602 * netif_subqueue_stopped - test status of subqueue 1603 * @dev: network device 1604 * @queue_index: sub queue index 1605 * 1606 * Check individual transmit queue of a device with multiple transmit queues. 1607 */ 1608 static inline int __netif_subqueue_stopped(const struct net_device *dev, 1609 u16 queue_index) 1610 { 1611 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1612 1613 return netif_tx_queue_stopped(txq); 1614 } 1615 1616 static inline int netif_subqueue_stopped(const struct net_device *dev, 1617 struct sk_buff *skb) 1618 { 1619 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb)); 1620 } 1621 1622 /** 1623 * netif_wake_subqueue - allow sending packets on subqueue 1624 * @dev: network device 1625 * @queue_index: sub queue index 1626 * 1627 * Resume individual transmit queue of a device with multiple transmit queues. 1628 */ 1629 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 1630 { 1631 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1632 #ifdef CONFIG_NETPOLL_TRAP 1633 if (netpoll_trap()) 1634 return; 1635 #endif 1636 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state)) 1637 __netif_schedule(txq->qdisc); 1638 } 1639 1640 /** 1641 * netif_is_multiqueue - test if device has multiple transmit queues 1642 * @dev: network device 1643 * 1644 * Check if device has multiple transmit queues 1645 */ 1646 static inline int netif_is_multiqueue(const struct net_device *dev) 1647 { 1648 return (dev->num_tx_queues > 1); 1649 } 1650 1651 /* Use this variant when it is known for sure that it 1652 * is executing from hardware interrupt context or with hardware interrupts 1653 * disabled. 1654 */ 1655 extern void dev_kfree_skb_irq(struct sk_buff *skb); 1656 1657 /* Use this variant in places where it could be invoked 1658 * from either hardware interrupt or other context, with hardware interrupts 1659 * either disabled or enabled. 1660 */ 1661 extern void dev_kfree_skb_any(struct sk_buff *skb); 1662 1663 #define HAVE_NETIF_RX 1 1664 extern int netif_rx(struct sk_buff *skb); 1665 extern int netif_rx_ni(struct sk_buff *skb); 1666 #define HAVE_NETIF_RECEIVE_SKB 1 1667 extern int netif_receive_skb(struct sk_buff *skb); 1668 extern gro_result_t dev_gro_receive(struct napi_struct *napi, 1669 struct sk_buff *skb); 1670 extern gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb); 1671 extern gro_result_t napi_gro_receive(struct napi_struct *napi, 1672 struct sk_buff *skb); 1673 extern void napi_reuse_skb(struct napi_struct *napi, 1674 struct sk_buff *skb); 1675 extern struct sk_buff * napi_get_frags(struct napi_struct *napi); 1676 extern gro_result_t napi_frags_finish(struct napi_struct *napi, 1677 struct sk_buff *skb, 1678 gro_result_t ret); 1679 extern struct sk_buff * napi_frags_skb(struct napi_struct *napi); 1680 extern gro_result_t napi_gro_frags(struct napi_struct *napi); 1681 1682 static inline void napi_free_frags(struct napi_struct *napi) 1683 { 1684 kfree_skb(napi->skb); 1685 napi->skb = NULL; 1686 } 1687 1688 extern void netif_nit_deliver(struct sk_buff *skb); 1689 extern int dev_valid_name(const char *name); 1690 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *); 1691 extern int dev_ethtool(struct net *net, struct ifreq *); 1692 extern unsigned dev_get_flags(const struct net_device *); 1693 extern int __dev_change_flags(struct net_device *, unsigned int flags); 1694 extern int dev_change_flags(struct net_device *, unsigned); 1695 extern void __dev_notify_flags(struct net_device *, unsigned int old_flags); 1696 extern int dev_change_name(struct net_device *, const char *); 1697 extern int dev_set_alias(struct net_device *, const char *, size_t); 1698 extern int dev_change_net_namespace(struct net_device *, 1699 struct net *, const char *); 1700 extern int dev_set_mtu(struct net_device *, int); 1701 extern int dev_set_mac_address(struct net_device *, 1702 struct sockaddr *); 1703 extern int dev_hard_start_xmit(struct sk_buff *skb, 1704 struct net_device *dev, 1705 struct netdev_queue *txq); 1706 extern int dev_forward_skb(struct net_device *dev, 1707 struct sk_buff *skb); 1708 1709 extern int netdev_budget; 1710 1711 /* Called by rtnetlink.c:rtnl_unlock() */ 1712 extern void netdev_run_todo(void); 1713 1714 /** 1715 * dev_put - release reference to device 1716 * @dev: network device 1717 * 1718 * Release reference to device to allow it to be freed. 1719 */ 1720 static inline void dev_put(struct net_device *dev) 1721 { 1722 atomic_dec(&dev->refcnt); 1723 } 1724 1725 /** 1726 * dev_hold - get reference to device 1727 * @dev: network device 1728 * 1729 * Hold reference to device to keep it from being freed. 1730 */ 1731 static inline void dev_hold(struct net_device *dev) 1732 { 1733 atomic_inc(&dev->refcnt); 1734 } 1735 1736 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 1737 * and _off may be called from IRQ context, but it is caller 1738 * who is responsible for serialization of these calls. 1739 * 1740 * The name carrier is inappropriate, these functions should really be 1741 * called netif_lowerlayer_*() because they represent the state of any 1742 * kind of lower layer not just hardware media. 1743 */ 1744 1745 extern void linkwatch_fire_event(struct net_device *dev); 1746 extern void linkwatch_forget_dev(struct net_device *dev); 1747 1748 /** 1749 * netif_carrier_ok - test if carrier present 1750 * @dev: network device 1751 * 1752 * Check if carrier is present on device 1753 */ 1754 static inline int netif_carrier_ok(const struct net_device *dev) 1755 { 1756 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 1757 } 1758 1759 extern unsigned long dev_trans_start(struct net_device *dev); 1760 1761 extern void __netdev_watchdog_up(struct net_device *dev); 1762 1763 extern void netif_carrier_on(struct net_device *dev); 1764 1765 extern void netif_carrier_off(struct net_device *dev); 1766 1767 /** 1768 * netif_dormant_on - mark device as dormant. 1769 * @dev: network device 1770 * 1771 * Mark device as dormant (as per RFC2863). 1772 * 1773 * The dormant state indicates that the relevant interface is not 1774 * actually in a condition to pass packets (i.e., it is not 'up') but is 1775 * in a "pending" state, waiting for some external event. For "on- 1776 * demand" interfaces, this new state identifies the situation where the 1777 * interface is waiting for events to place it in the up state. 1778 * 1779 */ 1780 static inline void netif_dormant_on(struct net_device *dev) 1781 { 1782 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 1783 linkwatch_fire_event(dev); 1784 } 1785 1786 /** 1787 * netif_dormant_off - set device as not dormant. 1788 * @dev: network device 1789 * 1790 * Device is not in dormant state. 1791 */ 1792 static inline void netif_dormant_off(struct net_device *dev) 1793 { 1794 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 1795 linkwatch_fire_event(dev); 1796 } 1797 1798 /** 1799 * netif_dormant - test if carrier present 1800 * @dev: network device 1801 * 1802 * Check if carrier is present on device 1803 */ 1804 static inline int netif_dormant(const struct net_device *dev) 1805 { 1806 return test_bit(__LINK_STATE_DORMANT, &dev->state); 1807 } 1808 1809 1810 /** 1811 * netif_oper_up - test if device is operational 1812 * @dev: network device 1813 * 1814 * Check if carrier is operational 1815 */ 1816 static inline int netif_oper_up(const struct net_device *dev) 1817 { 1818 return (dev->operstate == IF_OPER_UP || 1819 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 1820 } 1821 1822 /** 1823 * netif_device_present - is device available or removed 1824 * @dev: network device 1825 * 1826 * Check if device has not been removed from system. 1827 */ 1828 static inline int netif_device_present(struct net_device *dev) 1829 { 1830 return test_bit(__LINK_STATE_PRESENT, &dev->state); 1831 } 1832 1833 extern void netif_device_detach(struct net_device *dev); 1834 1835 extern void netif_device_attach(struct net_device *dev); 1836 1837 /* 1838 * Network interface message level settings 1839 */ 1840 #define HAVE_NETIF_MSG 1 1841 1842 enum { 1843 NETIF_MSG_DRV = 0x0001, 1844 NETIF_MSG_PROBE = 0x0002, 1845 NETIF_MSG_LINK = 0x0004, 1846 NETIF_MSG_TIMER = 0x0008, 1847 NETIF_MSG_IFDOWN = 0x0010, 1848 NETIF_MSG_IFUP = 0x0020, 1849 NETIF_MSG_RX_ERR = 0x0040, 1850 NETIF_MSG_TX_ERR = 0x0080, 1851 NETIF_MSG_TX_QUEUED = 0x0100, 1852 NETIF_MSG_INTR = 0x0200, 1853 NETIF_MSG_TX_DONE = 0x0400, 1854 NETIF_MSG_RX_STATUS = 0x0800, 1855 NETIF_MSG_PKTDATA = 0x1000, 1856 NETIF_MSG_HW = 0x2000, 1857 NETIF_MSG_WOL = 0x4000, 1858 }; 1859 1860 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 1861 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 1862 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 1863 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 1864 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 1865 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 1866 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 1867 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 1868 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 1869 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 1870 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 1871 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 1872 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 1873 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 1874 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 1875 1876 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 1877 { 1878 /* use default */ 1879 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 1880 return default_msg_enable_bits; 1881 if (debug_value == 0) /* no output */ 1882 return 0; 1883 /* set low N bits */ 1884 return (1 << debug_value) - 1; 1885 } 1886 1887 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu) 1888 { 1889 spin_lock(&txq->_xmit_lock); 1890 txq->xmit_lock_owner = cpu; 1891 } 1892 1893 static inline void __netif_tx_lock_bh(struct netdev_queue *txq) 1894 { 1895 spin_lock_bh(&txq->_xmit_lock); 1896 txq->xmit_lock_owner = smp_processor_id(); 1897 } 1898 1899 static inline int __netif_tx_trylock(struct netdev_queue *txq) 1900 { 1901 int ok = spin_trylock(&txq->_xmit_lock); 1902 if (likely(ok)) 1903 txq->xmit_lock_owner = smp_processor_id(); 1904 return ok; 1905 } 1906 1907 static inline void __netif_tx_unlock(struct netdev_queue *txq) 1908 { 1909 txq->xmit_lock_owner = -1; 1910 spin_unlock(&txq->_xmit_lock); 1911 } 1912 1913 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq) 1914 { 1915 txq->xmit_lock_owner = -1; 1916 spin_unlock_bh(&txq->_xmit_lock); 1917 } 1918 1919 static inline void txq_trans_update(struct netdev_queue *txq) 1920 { 1921 if (txq->xmit_lock_owner != -1) 1922 txq->trans_start = jiffies; 1923 } 1924 1925 /** 1926 * netif_tx_lock - grab network device transmit lock 1927 * @dev: network device 1928 * 1929 * Get network device transmit lock 1930 */ 1931 static inline void netif_tx_lock(struct net_device *dev) 1932 { 1933 unsigned int i; 1934 int cpu; 1935 1936 spin_lock(&dev->tx_global_lock); 1937 cpu = smp_processor_id(); 1938 for (i = 0; i < dev->num_tx_queues; i++) { 1939 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1940 1941 /* We are the only thread of execution doing a 1942 * freeze, but we have to grab the _xmit_lock in 1943 * order to synchronize with threads which are in 1944 * the ->hard_start_xmit() handler and already 1945 * checked the frozen bit. 1946 */ 1947 __netif_tx_lock(txq, cpu); 1948 set_bit(__QUEUE_STATE_FROZEN, &txq->state); 1949 __netif_tx_unlock(txq); 1950 } 1951 } 1952 1953 static inline void netif_tx_lock_bh(struct net_device *dev) 1954 { 1955 local_bh_disable(); 1956 netif_tx_lock(dev); 1957 } 1958 1959 static inline void netif_tx_unlock(struct net_device *dev) 1960 { 1961 unsigned int i; 1962 1963 for (i = 0; i < dev->num_tx_queues; i++) { 1964 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1965 1966 /* No need to grab the _xmit_lock here. If the 1967 * queue is not stopped for another reason, we 1968 * force a schedule. 1969 */ 1970 clear_bit(__QUEUE_STATE_FROZEN, &txq->state); 1971 netif_schedule_queue(txq); 1972 } 1973 spin_unlock(&dev->tx_global_lock); 1974 } 1975 1976 static inline void netif_tx_unlock_bh(struct net_device *dev) 1977 { 1978 netif_tx_unlock(dev); 1979 local_bh_enable(); 1980 } 1981 1982 #define HARD_TX_LOCK(dev, txq, cpu) { \ 1983 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1984 __netif_tx_lock(txq, cpu); \ 1985 } \ 1986 } 1987 1988 #define HARD_TX_UNLOCK(dev, txq) { \ 1989 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1990 __netif_tx_unlock(txq); \ 1991 } \ 1992 } 1993 1994 static inline void netif_tx_disable(struct net_device *dev) 1995 { 1996 unsigned int i; 1997 int cpu; 1998 1999 local_bh_disable(); 2000 cpu = smp_processor_id(); 2001 for (i = 0; i < dev->num_tx_queues; i++) { 2002 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 2003 2004 __netif_tx_lock(txq, cpu); 2005 netif_tx_stop_queue(txq); 2006 __netif_tx_unlock(txq); 2007 } 2008 local_bh_enable(); 2009 } 2010 2011 static inline void netif_addr_lock(struct net_device *dev) 2012 { 2013 spin_lock(&dev->addr_list_lock); 2014 } 2015 2016 static inline void netif_addr_lock_bh(struct net_device *dev) 2017 { 2018 spin_lock_bh(&dev->addr_list_lock); 2019 } 2020 2021 static inline void netif_addr_unlock(struct net_device *dev) 2022 { 2023 spin_unlock(&dev->addr_list_lock); 2024 } 2025 2026 static inline void netif_addr_unlock_bh(struct net_device *dev) 2027 { 2028 spin_unlock_bh(&dev->addr_list_lock); 2029 } 2030 2031 /* 2032 * dev_addrs walker. Should be used only for read access. Call with 2033 * rcu_read_lock held. 2034 */ 2035 #define for_each_dev_addr(dev, ha) \ 2036 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list) 2037 2038 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 2039 2040 extern void ether_setup(struct net_device *dev); 2041 2042 /* Support for loadable net-drivers */ 2043 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, 2044 void (*setup)(struct net_device *), 2045 unsigned int queue_count); 2046 #define alloc_netdev(sizeof_priv, name, setup) \ 2047 alloc_netdev_mq(sizeof_priv, name, setup, 1) 2048 extern int register_netdev(struct net_device *dev); 2049 extern void unregister_netdev(struct net_device *dev); 2050 2051 /* General hardware address lists handling functions */ 2052 extern int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list, 2053 struct netdev_hw_addr_list *from_list, 2054 int addr_len, unsigned char addr_type); 2055 extern void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list, 2056 struct netdev_hw_addr_list *from_list, 2057 int addr_len, unsigned char addr_type); 2058 extern int __hw_addr_sync(struct netdev_hw_addr_list *to_list, 2059 struct netdev_hw_addr_list *from_list, 2060 int addr_len); 2061 extern void __hw_addr_unsync(struct netdev_hw_addr_list *to_list, 2062 struct netdev_hw_addr_list *from_list, 2063 int addr_len); 2064 extern void __hw_addr_flush(struct netdev_hw_addr_list *list); 2065 extern void __hw_addr_init(struct netdev_hw_addr_list *list); 2066 2067 /* Functions used for device addresses handling */ 2068 extern int dev_addr_add(struct net_device *dev, unsigned char *addr, 2069 unsigned char addr_type); 2070 extern int dev_addr_del(struct net_device *dev, unsigned char *addr, 2071 unsigned char addr_type); 2072 extern int dev_addr_add_multiple(struct net_device *to_dev, 2073 struct net_device *from_dev, 2074 unsigned char addr_type); 2075 extern int dev_addr_del_multiple(struct net_device *to_dev, 2076 struct net_device *from_dev, 2077 unsigned char addr_type); 2078 extern void dev_addr_flush(struct net_device *dev); 2079 extern int dev_addr_init(struct net_device *dev); 2080 2081 /* Functions used for unicast addresses handling */ 2082 extern int dev_uc_add(struct net_device *dev, unsigned char *addr); 2083 extern int dev_uc_del(struct net_device *dev, unsigned char *addr); 2084 extern int dev_uc_sync(struct net_device *to, struct net_device *from); 2085 extern void dev_uc_unsync(struct net_device *to, struct net_device *from); 2086 extern void dev_uc_flush(struct net_device *dev); 2087 extern void dev_uc_init(struct net_device *dev); 2088 2089 /* Functions used for multicast addresses handling */ 2090 extern int dev_mc_add(struct net_device *dev, unsigned char *addr); 2091 extern int dev_mc_add_global(struct net_device *dev, unsigned char *addr); 2092 extern int dev_mc_del(struct net_device *dev, unsigned char *addr); 2093 extern int dev_mc_del_global(struct net_device *dev, unsigned char *addr); 2094 extern int dev_mc_sync(struct net_device *to, struct net_device *from); 2095 extern void dev_mc_unsync(struct net_device *to, struct net_device *from); 2096 extern void dev_mc_flush(struct net_device *dev); 2097 extern void dev_mc_init(struct net_device *dev); 2098 2099 /* Functions used for secondary unicast and multicast support */ 2100 extern void dev_set_rx_mode(struct net_device *dev); 2101 extern void __dev_set_rx_mode(struct net_device *dev); 2102 extern int dev_set_promiscuity(struct net_device *dev, int inc); 2103 extern int dev_set_allmulti(struct net_device *dev, int inc); 2104 extern void netdev_state_change(struct net_device *dev); 2105 extern int netdev_bonding_change(struct net_device *dev, 2106 unsigned long event); 2107 extern void netdev_features_change(struct net_device *dev); 2108 /* Load a device via the kmod */ 2109 extern void dev_load(struct net *net, const char *name); 2110 extern void dev_mcast_init(void); 2111 extern const struct net_device_stats *dev_get_stats(struct net_device *dev); 2112 extern void dev_txq_stats_fold(const struct net_device *dev, struct net_device_stats *stats); 2113 2114 extern int netdev_max_backlog; 2115 extern int netdev_tstamp_prequeue; 2116 extern int weight_p; 2117 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 2118 extern int skb_checksum_help(struct sk_buff *skb); 2119 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features); 2120 #ifdef CONFIG_BUG 2121 extern void netdev_rx_csum_fault(struct net_device *dev); 2122 #else 2123 static inline void netdev_rx_csum_fault(struct net_device *dev) 2124 { 2125 } 2126 #endif 2127 /* rx skb timestamps */ 2128 extern void net_enable_timestamp(void); 2129 extern void net_disable_timestamp(void); 2130 2131 #ifdef CONFIG_PROC_FS 2132 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 2133 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 2134 extern void dev_seq_stop(struct seq_file *seq, void *v); 2135 #endif 2136 2137 extern int netdev_class_create_file(struct class_attribute *class_attr); 2138 extern void netdev_class_remove_file(struct class_attribute *class_attr); 2139 2140 extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len); 2141 2142 extern void linkwatch_run_queue(void); 2143 2144 unsigned long netdev_increment_features(unsigned long all, unsigned long one, 2145 unsigned long mask); 2146 unsigned long netdev_fix_features(unsigned long features, const char *name); 2147 2148 void netif_stacked_transfer_operstate(const struct net_device *rootdev, 2149 struct net_device *dev); 2150 2151 static inline int net_gso_ok(int features, int gso_type) 2152 { 2153 int feature = gso_type << NETIF_F_GSO_SHIFT; 2154 return (features & feature) == feature; 2155 } 2156 2157 static inline int skb_gso_ok(struct sk_buff *skb, int features) 2158 { 2159 return net_gso_ok(features, skb_shinfo(skb)->gso_type) && 2160 (!skb_has_frags(skb) || (features & NETIF_F_FRAGLIST)); 2161 } 2162 2163 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb) 2164 { 2165 return skb_is_gso(skb) && 2166 (!skb_gso_ok(skb, dev->features) || 2167 unlikely(skb->ip_summed != CHECKSUM_PARTIAL)); 2168 } 2169 2170 static inline void netif_set_gso_max_size(struct net_device *dev, 2171 unsigned int size) 2172 { 2173 dev->gso_max_size = size; 2174 } 2175 2176 extern int __skb_bond_should_drop(struct sk_buff *skb, 2177 struct net_device *master); 2178 2179 static inline int skb_bond_should_drop(struct sk_buff *skb, 2180 struct net_device *master) 2181 { 2182 if (master) 2183 return __skb_bond_should_drop(skb, master); 2184 return 0; 2185 } 2186 2187 extern struct pernet_operations __net_initdata loopback_net_ops; 2188 2189 static inline int dev_ethtool_get_settings(struct net_device *dev, 2190 struct ethtool_cmd *cmd) 2191 { 2192 if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings) 2193 return -EOPNOTSUPP; 2194 return dev->ethtool_ops->get_settings(dev, cmd); 2195 } 2196 2197 static inline u32 dev_ethtool_get_rx_csum(struct net_device *dev) 2198 { 2199 if (!dev->ethtool_ops || !dev->ethtool_ops->get_rx_csum) 2200 return 0; 2201 return dev->ethtool_ops->get_rx_csum(dev); 2202 } 2203 2204 static inline u32 dev_ethtool_get_flags(struct net_device *dev) 2205 { 2206 if (!dev->ethtool_ops || !dev->ethtool_ops->get_flags) 2207 return 0; 2208 return dev->ethtool_ops->get_flags(dev); 2209 } 2210 2211 /* Logging, debugging and troubleshooting/diagnostic helpers. */ 2212 2213 /* netdev_printk helpers, similar to dev_printk */ 2214 2215 static inline const char *netdev_name(const struct net_device *dev) 2216 { 2217 if (dev->reg_state != NETREG_REGISTERED) 2218 return "(unregistered net_device)"; 2219 return dev->name; 2220 } 2221 2222 #define netdev_printk(level, netdev, format, args...) \ 2223 dev_printk(level, (netdev)->dev.parent, \ 2224 "%s: " format, \ 2225 netdev_name(netdev), ##args) 2226 2227 #define netdev_emerg(dev, format, args...) \ 2228 netdev_printk(KERN_EMERG, dev, format, ##args) 2229 #define netdev_alert(dev, format, args...) \ 2230 netdev_printk(KERN_ALERT, dev, format, ##args) 2231 #define netdev_crit(dev, format, args...) \ 2232 netdev_printk(KERN_CRIT, dev, format, ##args) 2233 #define netdev_err(dev, format, args...) \ 2234 netdev_printk(KERN_ERR, dev, format, ##args) 2235 #define netdev_warn(dev, format, args...) \ 2236 netdev_printk(KERN_WARNING, dev, format, ##args) 2237 #define netdev_notice(dev, format, args...) \ 2238 netdev_printk(KERN_NOTICE, dev, format, ##args) 2239 #define netdev_info(dev, format, args...) \ 2240 netdev_printk(KERN_INFO, dev, format, ##args) 2241 2242 #if defined(DEBUG) 2243 #define netdev_dbg(__dev, format, args...) \ 2244 netdev_printk(KERN_DEBUG, __dev, format, ##args) 2245 #elif defined(CONFIG_DYNAMIC_DEBUG) 2246 #define netdev_dbg(__dev, format, args...) \ 2247 do { \ 2248 dynamic_dev_dbg((__dev)->dev.parent, "%s: " format, \ 2249 netdev_name(__dev), ##args); \ 2250 } while (0) 2251 #else 2252 #define netdev_dbg(__dev, format, args...) \ 2253 ({ \ 2254 if (0) \ 2255 netdev_printk(KERN_DEBUG, __dev, format, ##args); \ 2256 0; \ 2257 }) 2258 #endif 2259 2260 #if defined(VERBOSE_DEBUG) 2261 #define netdev_vdbg netdev_dbg 2262 #else 2263 2264 #define netdev_vdbg(dev, format, args...) \ 2265 ({ \ 2266 if (0) \ 2267 netdev_printk(KERN_DEBUG, dev, format, ##args); \ 2268 0; \ 2269 }) 2270 #endif 2271 2272 /* 2273 * netdev_WARN() acts like dev_printk(), but with the key difference 2274 * of using a WARN/WARN_ON to get the message out, including the 2275 * file/line information and a backtrace. 2276 */ 2277 #define netdev_WARN(dev, format, args...) \ 2278 WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args); 2279 2280 /* netif printk helpers, similar to netdev_printk */ 2281 2282 #define netif_printk(priv, type, level, dev, fmt, args...) \ 2283 do { \ 2284 if (netif_msg_##type(priv)) \ 2285 netdev_printk(level, (dev), fmt, ##args); \ 2286 } while (0) 2287 2288 #define netif_emerg(priv, type, dev, fmt, args...) \ 2289 netif_printk(priv, type, KERN_EMERG, dev, fmt, ##args) 2290 #define netif_alert(priv, type, dev, fmt, args...) \ 2291 netif_printk(priv, type, KERN_ALERT, dev, fmt, ##args) 2292 #define netif_crit(priv, type, dev, fmt, args...) \ 2293 netif_printk(priv, type, KERN_CRIT, dev, fmt, ##args) 2294 #define netif_err(priv, type, dev, fmt, args...) \ 2295 netif_printk(priv, type, KERN_ERR, dev, fmt, ##args) 2296 #define netif_warn(priv, type, dev, fmt, args...) \ 2297 netif_printk(priv, type, KERN_WARNING, dev, fmt, ##args) 2298 #define netif_notice(priv, type, dev, fmt, args...) \ 2299 netif_printk(priv, type, KERN_NOTICE, dev, fmt, ##args) 2300 #define netif_info(priv, type, dev, fmt, args...) \ 2301 netif_printk(priv, type, KERN_INFO, (dev), fmt, ##args) 2302 2303 #if defined(DEBUG) 2304 #define netif_dbg(priv, type, dev, format, args...) \ 2305 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args) 2306 #elif defined(CONFIG_DYNAMIC_DEBUG) 2307 #define netif_dbg(priv, type, netdev, format, args...) \ 2308 do { \ 2309 if (netif_msg_##type(priv)) \ 2310 dynamic_dev_dbg((netdev)->dev.parent, \ 2311 "%s: " format, \ 2312 netdev_name(netdev), ##args); \ 2313 } while (0) 2314 #else 2315 #define netif_dbg(priv, type, dev, format, args...) \ 2316 ({ \ 2317 if (0) \ 2318 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \ 2319 0; \ 2320 }) 2321 #endif 2322 2323 #if defined(VERBOSE_DEBUG) 2324 #define netif_vdbg netdev_dbg 2325 #else 2326 #define netif_vdbg(priv, type, dev, format, args...) \ 2327 ({ \ 2328 if (0) \ 2329 netif_printk(KERN_DEBUG, dev, format, ##args); \ 2330 0; \ 2331 }) 2332 #endif 2333 2334 #endif /* __KERNEL__ */ 2335 2336 #endif /* _LINUX_NETDEVICE_H */ 2337