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 unsigned int input_queue_tail; 1411 #endif 1412 unsigned dropped; 1413 struct sk_buff_head input_pkt_queue; 1414 struct napi_struct backlog; 1415 }; 1416 1417 static inline void input_queue_head_incr(struct softnet_data *sd) 1418 { 1419 #ifdef CONFIG_RPS 1420 sd->input_queue_head++; 1421 #endif 1422 } 1423 1424 static inline void input_queue_tail_incr_save(struct softnet_data *sd, 1425 unsigned int *qtail) 1426 { 1427 #ifdef CONFIG_RPS 1428 *qtail = ++sd->input_queue_tail; 1429 #endif 1430 } 1431 1432 DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); 1433 1434 #define HAVE_NETIF_QUEUE 1435 1436 extern void __netif_schedule(struct Qdisc *q); 1437 1438 static inline void netif_schedule_queue(struct netdev_queue *txq) 1439 { 1440 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state)) 1441 __netif_schedule(txq->qdisc); 1442 } 1443 1444 static inline void netif_tx_schedule_all(struct net_device *dev) 1445 { 1446 unsigned int i; 1447 1448 for (i = 0; i < dev->num_tx_queues; i++) 1449 netif_schedule_queue(netdev_get_tx_queue(dev, i)); 1450 } 1451 1452 static inline void netif_tx_start_queue(struct netdev_queue *dev_queue) 1453 { 1454 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1455 } 1456 1457 /** 1458 * netif_start_queue - allow transmit 1459 * @dev: network device 1460 * 1461 * Allow upper layers to call the device hard_start_xmit routine. 1462 */ 1463 static inline void netif_start_queue(struct net_device *dev) 1464 { 1465 netif_tx_start_queue(netdev_get_tx_queue(dev, 0)); 1466 } 1467 1468 static inline void netif_tx_start_all_queues(struct net_device *dev) 1469 { 1470 unsigned int i; 1471 1472 for (i = 0; i < dev->num_tx_queues; i++) { 1473 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1474 netif_tx_start_queue(txq); 1475 } 1476 } 1477 1478 static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue) 1479 { 1480 #ifdef CONFIG_NETPOLL_TRAP 1481 if (netpoll_trap()) { 1482 netif_tx_start_queue(dev_queue); 1483 return; 1484 } 1485 #endif 1486 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state)) 1487 __netif_schedule(dev_queue->qdisc); 1488 } 1489 1490 /** 1491 * netif_wake_queue - restart transmit 1492 * @dev: network device 1493 * 1494 * Allow upper layers to call the device hard_start_xmit routine. 1495 * Used for flow control when transmit resources are available. 1496 */ 1497 static inline void netif_wake_queue(struct net_device *dev) 1498 { 1499 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0)); 1500 } 1501 1502 static inline void netif_tx_wake_all_queues(struct net_device *dev) 1503 { 1504 unsigned int i; 1505 1506 for (i = 0; i < dev->num_tx_queues; i++) { 1507 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1508 netif_tx_wake_queue(txq); 1509 } 1510 } 1511 1512 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue) 1513 { 1514 set_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1515 } 1516 1517 /** 1518 * netif_stop_queue - stop transmitted packets 1519 * @dev: network device 1520 * 1521 * Stop upper layers calling the device hard_start_xmit routine. 1522 * Used for flow control when transmit resources are unavailable. 1523 */ 1524 static inline void netif_stop_queue(struct net_device *dev) 1525 { 1526 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0)); 1527 } 1528 1529 static inline void netif_tx_stop_all_queues(struct net_device *dev) 1530 { 1531 unsigned int i; 1532 1533 for (i = 0; i < dev->num_tx_queues; i++) { 1534 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1535 netif_tx_stop_queue(txq); 1536 } 1537 } 1538 1539 static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue) 1540 { 1541 return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1542 } 1543 1544 /** 1545 * netif_queue_stopped - test if transmit queue is flowblocked 1546 * @dev: network device 1547 * 1548 * Test if transmit queue on device is currently unable to send. 1549 */ 1550 static inline int netif_queue_stopped(const struct net_device *dev) 1551 { 1552 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0)); 1553 } 1554 1555 static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue) 1556 { 1557 return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state); 1558 } 1559 1560 /** 1561 * netif_running - test if up 1562 * @dev: network device 1563 * 1564 * Test if the device has been brought up. 1565 */ 1566 static inline int netif_running(const struct net_device *dev) 1567 { 1568 return test_bit(__LINK_STATE_START, &dev->state); 1569 } 1570 1571 /* 1572 * Routines to manage the subqueues on a device. We only need start 1573 * stop, and a check if it's stopped. All other device management is 1574 * done at the overall netdevice level. 1575 * Also test the device if we're multiqueue. 1576 */ 1577 1578 /** 1579 * netif_start_subqueue - allow sending packets on subqueue 1580 * @dev: network device 1581 * @queue_index: sub queue index 1582 * 1583 * Start individual transmit queue of a device with multiple transmit queues. 1584 */ 1585 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 1586 { 1587 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1588 1589 netif_tx_start_queue(txq); 1590 } 1591 1592 /** 1593 * netif_stop_subqueue - stop sending packets on subqueue 1594 * @dev: network device 1595 * @queue_index: sub queue index 1596 * 1597 * Stop individual transmit queue of a device with multiple transmit queues. 1598 */ 1599 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 1600 { 1601 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1602 #ifdef CONFIG_NETPOLL_TRAP 1603 if (netpoll_trap()) 1604 return; 1605 #endif 1606 netif_tx_stop_queue(txq); 1607 } 1608 1609 /** 1610 * netif_subqueue_stopped - test status of subqueue 1611 * @dev: network device 1612 * @queue_index: sub queue index 1613 * 1614 * Check individual transmit queue of a device with multiple transmit queues. 1615 */ 1616 static inline int __netif_subqueue_stopped(const struct net_device *dev, 1617 u16 queue_index) 1618 { 1619 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1620 1621 return netif_tx_queue_stopped(txq); 1622 } 1623 1624 static inline int netif_subqueue_stopped(const struct net_device *dev, 1625 struct sk_buff *skb) 1626 { 1627 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb)); 1628 } 1629 1630 /** 1631 * netif_wake_subqueue - allow sending packets on subqueue 1632 * @dev: network device 1633 * @queue_index: sub queue index 1634 * 1635 * Resume individual transmit queue of a device with multiple transmit queues. 1636 */ 1637 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 1638 { 1639 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1640 #ifdef CONFIG_NETPOLL_TRAP 1641 if (netpoll_trap()) 1642 return; 1643 #endif 1644 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state)) 1645 __netif_schedule(txq->qdisc); 1646 } 1647 1648 /** 1649 * netif_is_multiqueue - test if device has multiple transmit queues 1650 * @dev: network device 1651 * 1652 * Check if device has multiple transmit queues 1653 */ 1654 static inline int netif_is_multiqueue(const struct net_device *dev) 1655 { 1656 return (dev->num_tx_queues > 1); 1657 } 1658 1659 extern void netif_set_real_num_tx_queues(struct net_device *dev, 1660 unsigned int txq); 1661 1662 /* Use this variant when it is known for sure that it 1663 * is executing from hardware interrupt context or with hardware interrupts 1664 * disabled. 1665 */ 1666 extern void dev_kfree_skb_irq(struct sk_buff *skb); 1667 1668 /* Use this variant in places where it could be invoked 1669 * from either hardware interrupt or other context, with hardware interrupts 1670 * either disabled or enabled. 1671 */ 1672 extern void dev_kfree_skb_any(struct sk_buff *skb); 1673 1674 #define HAVE_NETIF_RX 1 1675 extern int netif_rx(struct sk_buff *skb); 1676 extern int netif_rx_ni(struct sk_buff *skb); 1677 #define HAVE_NETIF_RECEIVE_SKB 1 1678 extern int netif_receive_skb(struct sk_buff *skb); 1679 extern gro_result_t dev_gro_receive(struct napi_struct *napi, 1680 struct sk_buff *skb); 1681 extern gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb); 1682 extern gro_result_t napi_gro_receive(struct napi_struct *napi, 1683 struct sk_buff *skb); 1684 extern void napi_reuse_skb(struct napi_struct *napi, 1685 struct sk_buff *skb); 1686 extern struct sk_buff * napi_get_frags(struct napi_struct *napi); 1687 extern gro_result_t napi_frags_finish(struct napi_struct *napi, 1688 struct sk_buff *skb, 1689 gro_result_t ret); 1690 extern struct sk_buff * napi_frags_skb(struct napi_struct *napi); 1691 extern gro_result_t napi_gro_frags(struct napi_struct *napi); 1692 1693 static inline void napi_free_frags(struct napi_struct *napi) 1694 { 1695 kfree_skb(napi->skb); 1696 napi->skb = NULL; 1697 } 1698 1699 extern void netif_nit_deliver(struct sk_buff *skb); 1700 extern int dev_valid_name(const char *name); 1701 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *); 1702 extern int dev_ethtool(struct net *net, struct ifreq *); 1703 extern unsigned dev_get_flags(const struct net_device *); 1704 extern int __dev_change_flags(struct net_device *, unsigned int flags); 1705 extern int dev_change_flags(struct net_device *, unsigned); 1706 extern void __dev_notify_flags(struct net_device *, unsigned int old_flags); 1707 extern int dev_change_name(struct net_device *, const char *); 1708 extern int dev_set_alias(struct net_device *, const char *, size_t); 1709 extern int dev_change_net_namespace(struct net_device *, 1710 struct net *, const char *); 1711 extern int dev_set_mtu(struct net_device *, int); 1712 extern int dev_set_mac_address(struct net_device *, 1713 struct sockaddr *); 1714 extern int dev_hard_start_xmit(struct sk_buff *skb, 1715 struct net_device *dev, 1716 struct netdev_queue *txq); 1717 extern int dev_forward_skb(struct net_device *dev, 1718 struct sk_buff *skb); 1719 1720 extern int netdev_budget; 1721 1722 /* Called by rtnetlink.c:rtnl_unlock() */ 1723 extern void netdev_run_todo(void); 1724 1725 /** 1726 * dev_put - release reference to device 1727 * @dev: network device 1728 * 1729 * Release reference to device to allow it to be freed. 1730 */ 1731 static inline void dev_put(struct net_device *dev) 1732 { 1733 atomic_dec(&dev->refcnt); 1734 } 1735 1736 /** 1737 * dev_hold - get reference to device 1738 * @dev: network device 1739 * 1740 * Hold reference to device to keep it from being freed. 1741 */ 1742 static inline void dev_hold(struct net_device *dev) 1743 { 1744 atomic_inc(&dev->refcnt); 1745 } 1746 1747 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 1748 * and _off may be called from IRQ context, but it is caller 1749 * who is responsible for serialization of these calls. 1750 * 1751 * The name carrier is inappropriate, these functions should really be 1752 * called netif_lowerlayer_*() because they represent the state of any 1753 * kind of lower layer not just hardware media. 1754 */ 1755 1756 extern void linkwatch_fire_event(struct net_device *dev); 1757 extern void linkwatch_forget_dev(struct net_device *dev); 1758 1759 /** 1760 * netif_carrier_ok - test if carrier present 1761 * @dev: network device 1762 * 1763 * Check if carrier is present on device 1764 */ 1765 static inline int netif_carrier_ok(const struct net_device *dev) 1766 { 1767 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 1768 } 1769 1770 extern unsigned long dev_trans_start(struct net_device *dev); 1771 1772 extern void __netdev_watchdog_up(struct net_device *dev); 1773 1774 extern void netif_carrier_on(struct net_device *dev); 1775 1776 extern void netif_carrier_off(struct net_device *dev); 1777 1778 /** 1779 * netif_dormant_on - mark device as dormant. 1780 * @dev: network device 1781 * 1782 * Mark device as dormant (as per RFC2863). 1783 * 1784 * The dormant state indicates that the relevant interface is not 1785 * actually in a condition to pass packets (i.e., it is not 'up') but is 1786 * in a "pending" state, waiting for some external event. For "on- 1787 * demand" interfaces, this new state identifies the situation where the 1788 * interface is waiting for events to place it in the up state. 1789 * 1790 */ 1791 static inline void netif_dormant_on(struct net_device *dev) 1792 { 1793 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 1794 linkwatch_fire_event(dev); 1795 } 1796 1797 /** 1798 * netif_dormant_off - set device as not dormant. 1799 * @dev: network device 1800 * 1801 * Device is not in dormant state. 1802 */ 1803 static inline void netif_dormant_off(struct net_device *dev) 1804 { 1805 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 1806 linkwatch_fire_event(dev); 1807 } 1808 1809 /** 1810 * netif_dormant - test if carrier present 1811 * @dev: network device 1812 * 1813 * Check if carrier is present on device 1814 */ 1815 static inline int netif_dormant(const struct net_device *dev) 1816 { 1817 return test_bit(__LINK_STATE_DORMANT, &dev->state); 1818 } 1819 1820 1821 /** 1822 * netif_oper_up - test if device is operational 1823 * @dev: network device 1824 * 1825 * Check if carrier is operational 1826 */ 1827 static inline int netif_oper_up(const struct net_device *dev) 1828 { 1829 return (dev->operstate == IF_OPER_UP || 1830 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 1831 } 1832 1833 /** 1834 * netif_device_present - is device available or removed 1835 * @dev: network device 1836 * 1837 * Check if device has not been removed from system. 1838 */ 1839 static inline int netif_device_present(struct net_device *dev) 1840 { 1841 return test_bit(__LINK_STATE_PRESENT, &dev->state); 1842 } 1843 1844 extern void netif_device_detach(struct net_device *dev); 1845 1846 extern void netif_device_attach(struct net_device *dev); 1847 1848 /* 1849 * Network interface message level settings 1850 */ 1851 #define HAVE_NETIF_MSG 1 1852 1853 enum { 1854 NETIF_MSG_DRV = 0x0001, 1855 NETIF_MSG_PROBE = 0x0002, 1856 NETIF_MSG_LINK = 0x0004, 1857 NETIF_MSG_TIMER = 0x0008, 1858 NETIF_MSG_IFDOWN = 0x0010, 1859 NETIF_MSG_IFUP = 0x0020, 1860 NETIF_MSG_RX_ERR = 0x0040, 1861 NETIF_MSG_TX_ERR = 0x0080, 1862 NETIF_MSG_TX_QUEUED = 0x0100, 1863 NETIF_MSG_INTR = 0x0200, 1864 NETIF_MSG_TX_DONE = 0x0400, 1865 NETIF_MSG_RX_STATUS = 0x0800, 1866 NETIF_MSG_PKTDATA = 0x1000, 1867 NETIF_MSG_HW = 0x2000, 1868 NETIF_MSG_WOL = 0x4000, 1869 }; 1870 1871 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 1872 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 1873 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 1874 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 1875 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 1876 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 1877 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 1878 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 1879 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 1880 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 1881 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 1882 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 1883 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 1884 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 1885 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 1886 1887 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 1888 { 1889 /* use default */ 1890 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 1891 return default_msg_enable_bits; 1892 if (debug_value == 0) /* no output */ 1893 return 0; 1894 /* set low N bits */ 1895 return (1 << debug_value) - 1; 1896 } 1897 1898 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu) 1899 { 1900 spin_lock(&txq->_xmit_lock); 1901 txq->xmit_lock_owner = cpu; 1902 } 1903 1904 static inline void __netif_tx_lock_bh(struct netdev_queue *txq) 1905 { 1906 spin_lock_bh(&txq->_xmit_lock); 1907 txq->xmit_lock_owner = smp_processor_id(); 1908 } 1909 1910 static inline int __netif_tx_trylock(struct netdev_queue *txq) 1911 { 1912 int ok = spin_trylock(&txq->_xmit_lock); 1913 if (likely(ok)) 1914 txq->xmit_lock_owner = smp_processor_id(); 1915 return ok; 1916 } 1917 1918 static inline void __netif_tx_unlock(struct netdev_queue *txq) 1919 { 1920 txq->xmit_lock_owner = -1; 1921 spin_unlock(&txq->_xmit_lock); 1922 } 1923 1924 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq) 1925 { 1926 txq->xmit_lock_owner = -1; 1927 spin_unlock_bh(&txq->_xmit_lock); 1928 } 1929 1930 static inline void txq_trans_update(struct netdev_queue *txq) 1931 { 1932 if (txq->xmit_lock_owner != -1) 1933 txq->trans_start = jiffies; 1934 } 1935 1936 /** 1937 * netif_tx_lock - grab network device transmit lock 1938 * @dev: network device 1939 * 1940 * Get network device transmit lock 1941 */ 1942 static inline void netif_tx_lock(struct net_device *dev) 1943 { 1944 unsigned int i; 1945 int cpu; 1946 1947 spin_lock(&dev->tx_global_lock); 1948 cpu = smp_processor_id(); 1949 for (i = 0; i < dev->num_tx_queues; i++) { 1950 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1951 1952 /* We are the only thread of execution doing a 1953 * freeze, but we have to grab the _xmit_lock in 1954 * order to synchronize with threads which are in 1955 * the ->hard_start_xmit() handler and already 1956 * checked the frozen bit. 1957 */ 1958 __netif_tx_lock(txq, cpu); 1959 set_bit(__QUEUE_STATE_FROZEN, &txq->state); 1960 __netif_tx_unlock(txq); 1961 } 1962 } 1963 1964 static inline void netif_tx_lock_bh(struct net_device *dev) 1965 { 1966 local_bh_disable(); 1967 netif_tx_lock(dev); 1968 } 1969 1970 static inline void netif_tx_unlock(struct net_device *dev) 1971 { 1972 unsigned int i; 1973 1974 for (i = 0; i < dev->num_tx_queues; i++) { 1975 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1976 1977 /* No need to grab the _xmit_lock here. If the 1978 * queue is not stopped for another reason, we 1979 * force a schedule. 1980 */ 1981 clear_bit(__QUEUE_STATE_FROZEN, &txq->state); 1982 netif_schedule_queue(txq); 1983 } 1984 spin_unlock(&dev->tx_global_lock); 1985 } 1986 1987 static inline void netif_tx_unlock_bh(struct net_device *dev) 1988 { 1989 netif_tx_unlock(dev); 1990 local_bh_enable(); 1991 } 1992 1993 #define HARD_TX_LOCK(dev, txq, cpu) { \ 1994 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1995 __netif_tx_lock(txq, cpu); \ 1996 } \ 1997 } 1998 1999 #define HARD_TX_UNLOCK(dev, txq) { \ 2000 if ((dev->features & NETIF_F_LLTX) == 0) { \ 2001 __netif_tx_unlock(txq); \ 2002 } \ 2003 } 2004 2005 static inline void netif_tx_disable(struct net_device *dev) 2006 { 2007 unsigned int i; 2008 int cpu; 2009 2010 local_bh_disable(); 2011 cpu = smp_processor_id(); 2012 for (i = 0; i < dev->num_tx_queues; i++) { 2013 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 2014 2015 __netif_tx_lock(txq, cpu); 2016 netif_tx_stop_queue(txq); 2017 __netif_tx_unlock(txq); 2018 } 2019 local_bh_enable(); 2020 } 2021 2022 static inline void netif_addr_lock(struct net_device *dev) 2023 { 2024 spin_lock(&dev->addr_list_lock); 2025 } 2026 2027 static inline void netif_addr_lock_bh(struct net_device *dev) 2028 { 2029 spin_lock_bh(&dev->addr_list_lock); 2030 } 2031 2032 static inline void netif_addr_unlock(struct net_device *dev) 2033 { 2034 spin_unlock(&dev->addr_list_lock); 2035 } 2036 2037 static inline void netif_addr_unlock_bh(struct net_device *dev) 2038 { 2039 spin_unlock_bh(&dev->addr_list_lock); 2040 } 2041 2042 /* 2043 * dev_addrs walker. Should be used only for read access. Call with 2044 * rcu_read_lock held. 2045 */ 2046 #define for_each_dev_addr(dev, ha) \ 2047 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list) 2048 2049 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 2050 2051 extern void ether_setup(struct net_device *dev); 2052 2053 /* Support for loadable net-drivers */ 2054 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, 2055 void (*setup)(struct net_device *), 2056 unsigned int queue_count); 2057 #define alloc_netdev(sizeof_priv, name, setup) \ 2058 alloc_netdev_mq(sizeof_priv, name, setup, 1) 2059 extern int register_netdev(struct net_device *dev); 2060 extern void unregister_netdev(struct net_device *dev); 2061 2062 /* General hardware address lists handling functions */ 2063 extern int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list, 2064 struct netdev_hw_addr_list *from_list, 2065 int addr_len, unsigned char addr_type); 2066 extern void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list, 2067 struct netdev_hw_addr_list *from_list, 2068 int addr_len, unsigned char addr_type); 2069 extern int __hw_addr_sync(struct netdev_hw_addr_list *to_list, 2070 struct netdev_hw_addr_list *from_list, 2071 int addr_len); 2072 extern void __hw_addr_unsync(struct netdev_hw_addr_list *to_list, 2073 struct netdev_hw_addr_list *from_list, 2074 int addr_len); 2075 extern void __hw_addr_flush(struct netdev_hw_addr_list *list); 2076 extern void __hw_addr_init(struct netdev_hw_addr_list *list); 2077 2078 /* Functions used for device addresses handling */ 2079 extern int dev_addr_add(struct net_device *dev, unsigned char *addr, 2080 unsigned char addr_type); 2081 extern int dev_addr_del(struct net_device *dev, unsigned char *addr, 2082 unsigned char addr_type); 2083 extern int dev_addr_add_multiple(struct net_device *to_dev, 2084 struct net_device *from_dev, 2085 unsigned char addr_type); 2086 extern int dev_addr_del_multiple(struct net_device *to_dev, 2087 struct net_device *from_dev, 2088 unsigned char addr_type); 2089 extern void dev_addr_flush(struct net_device *dev); 2090 extern int dev_addr_init(struct net_device *dev); 2091 2092 /* Functions used for unicast addresses handling */ 2093 extern int dev_uc_add(struct net_device *dev, unsigned char *addr); 2094 extern int dev_uc_del(struct net_device *dev, unsigned char *addr); 2095 extern int dev_uc_sync(struct net_device *to, struct net_device *from); 2096 extern void dev_uc_unsync(struct net_device *to, struct net_device *from); 2097 extern void dev_uc_flush(struct net_device *dev); 2098 extern void dev_uc_init(struct net_device *dev); 2099 2100 /* Functions used for multicast addresses handling */ 2101 extern int dev_mc_add(struct net_device *dev, unsigned char *addr); 2102 extern int dev_mc_add_global(struct net_device *dev, unsigned char *addr); 2103 extern int dev_mc_del(struct net_device *dev, unsigned char *addr); 2104 extern int dev_mc_del_global(struct net_device *dev, unsigned char *addr); 2105 extern int dev_mc_sync(struct net_device *to, struct net_device *from); 2106 extern void dev_mc_unsync(struct net_device *to, struct net_device *from); 2107 extern void dev_mc_flush(struct net_device *dev); 2108 extern void dev_mc_init(struct net_device *dev); 2109 2110 /* Functions used for secondary unicast and multicast support */ 2111 extern void dev_set_rx_mode(struct net_device *dev); 2112 extern void __dev_set_rx_mode(struct net_device *dev); 2113 extern int dev_set_promiscuity(struct net_device *dev, int inc); 2114 extern int dev_set_allmulti(struct net_device *dev, int inc); 2115 extern void netdev_state_change(struct net_device *dev); 2116 extern int netdev_bonding_change(struct net_device *dev, 2117 unsigned long event); 2118 extern void netdev_features_change(struct net_device *dev); 2119 /* Load a device via the kmod */ 2120 extern void dev_load(struct net *net, const char *name); 2121 extern void dev_mcast_init(void); 2122 extern const struct net_device_stats *dev_get_stats(struct net_device *dev); 2123 extern void dev_txq_stats_fold(const struct net_device *dev, struct net_device_stats *stats); 2124 2125 extern int netdev_max_backlog; 2126 extern int netdev_tstamp_prequeue; 2127 extern int weight_p; 2128 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 2129 extern int skb_checksum_help(struct sk_buff *skb); 2130 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features); 2131 #ifdef CONFIG_BUG 2132 extern void netdev_rx_csum_fault(struct net_device *dev); 2133 #else 2134 static inline void netdev_rx_csum_fault(struct net_device *dev) 2135 { 2136 } 2137 #endif 2138 /* rx skb timestamps */ 2139 extern void net_enable_timestamp(void); 2140 extern void net_disable_timestamp(void); 2141 2142 #ifdef CONFIG_PROC_FS 2143 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 2144 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 2145 extern void dev_seq_stop(struct seq_file *seq, void *v); 2146 #endif 2147 2148 extern int netdev_class_create_file(struct class_attribute *class_attr); 2149 extern void netdev_class_remove_file(struct class_attribute *class_attr); 2150 2151 extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len); 2152 2153 extern void linkwatch_run_queue(void); 2154 2155 unsigned long netdev_increment_features(unsigned long all, unsigned long one, 2156 unsigned long mask); 2157 unsigned long netdev_fix_features(unsigned long features, const char *name); 2158 2159 void netif_stacked_transfer_operstate(const struct net_device *rootdev, 2160 struct net_device *dev); 2161 2162 static inline int net_gso_ok(int features, int gso_type) 2163 { 2164 int feature = gso_type << NETIF_F_GSO_SHIFT; 2165 return (features & feature) == feature; 2166 } 2167 2168 static inline int skb_gso_ok(struct sk_buff *skb, int features) 2169 { 2170 return net_gso_ok(features, skb_shinfo(skb)->gso_type) && 2171 (!skb_has_frags(skb) || (features & NETIF_F_FRAGLIST)); 2172 } 2173 2174 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb) 2175 { 2176 return skb_is_gso(skb) && 2177 (!skb_gso_ok(skb, dev->features) || 2178 unlikely(skb->ip_summed != CHECKSUM_PARTIAL)); 2179 } 2180 2181 static inline void netif_set_gso_max_size(struct net_device *dev, 2182 unsigned int size) 2183 { 2184 dev->gso_max_size = size; 2185 } 2186 2187 extern int __skb_bond_should_drop(struct sk_buff *skb, 2188 struct net_device *master); 2189 2190 static inline int skb_bond_should_drop(struct sk_buff *skb, 2191 struct net_device *master) 2192 { 2193 if (master) 2194 return __skb_bond_should_drop(skb, master); 2195 return 0; 2196 } 2197 2198 extern struct pernet_operations __net_initdata loopback_net_ops; 2199 2200 static inline int dev_ethtool_get_settings(struct net_device *dev, 2201 struct ethtool_cmd *cmd) 2202 { 2203 if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings) 2204 return -EOPNOTSUPP; 2205 return dev->ethtool_ops->get_settings(dev, cmd); 2206 } 2207 2208 static inline u32 dev_ethtool_get_rx_csum(struct net_device *dev) 2209 { 2210 if (!dev->ethtool_ops || !dev->ethtool_ops->get_rx_csum) 2211 return 0; 2212 return dev->ethtool_ops->get_rx_csum(dev); 2213 } 2214 2215 static inline u32 dev_ethtool_get_flags(struct net_device *dev) 2216 { 2217 if (!dev->ethtool_ops || !dev->ethtool_ops->get_flags) 2218 return 0; 2219 return dev->ethtool_ops->get_flags(dev); 2220 } 2221 2222 /* Logging, debugging and troubleshooting/diagnostic helpers. */ 2223 2224 /* netdev_printk helpers, similar to dev_printk */ 2225 2226 static inline const char *netdev_name(const struct net_device *dev) 2227 { 2228 if (dev->reg_state != NETREG_REGISTERED) 2229 return "(unregistered net_device)"; 2230 return dev->name; 2231 } 2232 2233 #define netdev_printk(level, netdev, format, args...) \ 2234 dev_printk(level, (netdev)->dev.parent, \ 2235 "%s: " format, \ 2236 netdev_name(netdev), ##args) 2237 2238 #define netdev_emerg(dev, format, args...) \ 2239 netdev_printk(KERN_EMERG, dev, format, ##args) 2240 #define netdev_alert(dev, format, args...) \ 2241 netdev_printk(KERN_ALERT, dev, format, ##args) 2242 #define netdev_crit(dev, format, args...) \ 2243 netdev_printk(KERN_CRIT, dev, format, ##args) 2244 #define netdev_err(dev, format, args...) \ 2245 netdev_printk(KERN_ERR, dev, format, ##args) 2246 #define netdev_warn(dev, format, args...) \ 2247 netdev_printk(KERN_WARNING, dev, format, ##args) 2248 #define netdev_notice(dev, format, args...) \ 2249 netdev_printk(KERN_NOTICE, dev, format, ##args) 2250 #define netdev_info(dev, format, args...) \ 2251 netdev_printk(KERN_INFO, dev, format, ##args) 2252 2253 #if defined(DEBUG) 2254 #define netdev_dbg(__dev, format, args...) \ 2255 netdev_printk(KERN_DEBUG, __dev, format, ##args) 2256 #elif defined(CONFIG_DYNAMIC_DEBUG) 2257 #define netdev_dbg(__dev, format, args...) \ 2258 do { \ 2259 dynamic_dev_dbg((__dev)->dev.parent, "%s: " format, \ 2260 netdev_name(__dev), ##args); \ 2261 } while (0) 2262 #else 2263 #define netdev_dbg(__dev, format, args...) \ 2264 ({ \ 2265 if (0) \ 2266 netdev_printk(KERN_DEBUG, __dev, format, ##args); \ 2267 0; \ 2268 }) 2269 #endif 2270 2271 #if defined(VERBOSE_DEBUG) 2272 #define netdev_vdbg netdev_dbg 2273 #else 2274 2275 #define netdev_vdbg(dev, format, args...) \ 2276 ({ \ 2277 if (0) \ 2278 netdev_printk(KERN_DEBUG, dev, format, ##args); \ 2279 0; \ 2280 }) 2281 #endif 2282 2283 /* 2284 * netdev_WARN() acts like dev_printk(), but with the key difference 2285 * of using a WARN/WARN_ON to get the message out, including the 2286 * file/line information and a backtrace. 2287 */ 2288 #define netdev_WARN(dev, format, args...) \ 2289 WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args); 2290 2291 /* netif printk helpers, similar to netdev_printk */ 2292 2293 #define netif_printk(priv, type, level, dev, fmt, args...) \ 2294 do { \ 2295 if (netif_msg_##type(priv)) \ 2296 netdev_printk(level, (dev), fmt, ##args); \ 2297 } while (0) 2298 2299 #define netif_emerg(priv, type, dev, fmt, args...) \ 2300 netif_printk(priv, type, KERN_EMERG, dev, fmt, ##args) 2301 #define netif_alert(priv, type, dev, fmt, args...) \ 2302 netif_printk(priv, type, KERN_ALERT, dev, fmt, ##args) 2303 #define netif_crit(priv, type, dev, fmt, args...) \ 2304 netif_printk(priv, type, KERN_CRIT, dev, fmt, ##args) 2305 #define netif_err(priv, type, dev, fmt, args...) \ 2306 netif_printk(priv, type, KERN_ERR, dev, fmt, ##args) 2307 #define netif_warn(priv, type, dev, fmt, args...) \ 2308 netif_printk(priv, type, KERN_WARNING, dev, fmt, ##args) 2309 #define netif_notice(priv, type, dev, fmt, args...) \ 2310 netif_printk(priv, type, KERN_NOTICE, dev, fmt, ##args) 2311 #define netif_info(priv, type, dev, fmt, args...) \ 2312 netif_printk(priv, type, KERN_INFO, (dev), fmt, ##args) 2313 2314 #if defined(DEBUG) 2315 #define netif_dbg(priv, type, dev, format, args...) \ 2316 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args) 2317 #elif defined(CONFIG_DYNAMIC_DEBUG) 2318 #define netif_dbg(priv, type, netdev, format, args...) \ 2319 do { \ 2320 if (netif_msg_##type(priv)) \ 2321 dynamic_dev_dbg((netdev)->dev.parent, \ 2322 "%s: " format, \ 2323 netdev_name(netdev), ##args); \ 2324 } while (0) 2325 #else 2326 #define netif_dbg(priv, type, dev, format, args...) \ 2327 ({ \ 2328 if (0) \ 2329 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \ 2330 0; \ 2331 }) 2332 #endif 2333 2334 #if defined(VERBOSE_DEBUG) 2335 #define netif_vdbg netif_dbg 2336 #else 2337 #define netif_vdbg(priv, type, dev, format, args...) \ 2338 ({ \ 2339 if (0) \ 2340 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \ 2341 0; \ 2342 }) 2343 #endif 2344 2345 #endif /* __KERNEL__ */ 2346 2347 #endif /* _LINUX_NETDEVICE_H */ 2348