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 32 #ifdef __KERNEL__ 33 #include <linux/timer.h> 34 #include <linux/delay.h> 35 #include <asm/atomic.h> 36 #include <asm/cache.h> 37 #include <asm/byteorder.h> 38 39 #include <linux/device.h> 40 #include <linux/percpu.h> 41 #include <linux/dmaengine.h> 42 #include <linux/workqueue.h> 43 44 #include <net/net_namespace.h> 45 #include <net/dsa.h> 46 47 struct vlan_group; 48 struct ethtool_ops; 49 struct netpoll_info; 50 /* 802.11 specific */ 51 struct wireless_dev; 52 /* source back-compat hooks */ 53 #define SET_ETHTOOL_OPS(netdev,ops) \ 54 ( (netdev)->ethtool_ops = (ops) ) 55 56 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev 57 functions are available. */ 58 #define HAVE_FREE_NETDEV /* free_netdev() */ 59 #define HAVE_NETDEV_PRIV /* netdev_priv() */ 60 61 #define NET_XMIT_SUCCESS 0 62 #define NET_XMIT_DROP 1 /* skb dropped */ 63 #define NET_XMIT_CN 2 /* congestion notification */ 64 #define NET_XMIT_POLICED 3 /* skb is shot by police */ 65 #define NET_XMIT_MASK 0xFFFF /* qdisc flags in net/sch_generic.h */ 66 67 /* Backlog congestion levels */ 68 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */ 69 #define NET_RX_DROP 1 /* packet dropped */ 70 #define NET_RX_CN_LOW 2 /* storm alert, just in case */ 71 #define NET_RX_CN_MOD 3 /* Storm on its way! */ 72 #define NET_RX_CN_HIGH 4 /* The storm is here */ 73 #define NET_RX_BAD 5 /* packet dropped due to kernel error */ 74 75 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It 76 * indicates that the device will soon be dropping packets, or already drops 77 * some packets of the same priority; prompting us to send less aggressively. */ 78 #define net_xmit_eval(e) ((e) == NET_XMIT_CN? 0 : (e)) 79 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0) 80 81 #endif 82 83 #define MAX_ADDR_LEN 32 /* Largest hardware address length */ 84 85 /* Driver transmit return codes */ 86 #define NETDEV_TX_OK 0 /* driver took care of packet */ 87 #define NETDEV_TX_BUSY 1 /* driver tx path was busy*/ 88 #define NETDEV_TX_LOCKED -1 /* driver tx lock was already taken */ 89 90 #ifdef __KERNEL__ 91 92 /* 93 * Compute the worst case header length according to the protocols 94 * used. 95 */ 96 97 #if defined(CONFIG_WLAN_80211) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 98 # if defined(CONFIG_MAC80211_MESH) 99 # define LL_MAX_HEADER 128 100 # else 101 # define LL_MAX_HEADER 96 102 # endif 103 #elif defined(CONFIG_TR) 104 # define LL_MAX_HEADER 48 105 #else 106 # define LL_MAX_HEADER 32 107 #endif 108 109 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \ 110 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \ 111 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \ 112 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE) 113 #define MAX_HEADER LL_MAX_HEADER 114 #else 115 #define MAX_HEADER (LL_MAX_HEADER + 48) 116 #endif 117 118 #endif /* __KERNEL__ */ 119 120 /* 121 * Network device statistics. Akin to the 2.0 ether stats but 122 * with byte counters. 123 */ 124 125 struct net_device_stats 126 { 127 unsigned long rx_packets; /* total packets received */ 128 unsigned long tx_packets; /* total packets transmitted */ 129 unsigned long rx_bytes; /* total bytes received */ 130 unsigned long tx_bytes; /* total bytes transmitted */ 131 unsigned long rx_errors; /* bad packets received */ 132 unsigned long tx_errors; /* packet transmit problems */ 133 unsigned long rx_dropped; /* no space in linux buffers */ 134 unsigned long tx_dropped; /* no space available in linux */ 135 unsigned long multicast; /* multicast packets received */ 136 unsigned long collisions; 137 138 /* detailed rx_errors: */ 139 unsigned long rx_length_errors; 140 unsigned long rx_over_errors; /* receiver ring buff overflow */ 141 unsigned long rx_crc_errors; /* recved pkt with crc error */ 142 unsigned long rx_frame_errors; /* recv'd frame alignment error */ 143 unsigned long rx_fifo_errors; /* recv'r fifo overrun */ 144 unsigned long rx_missed_errors; /* receiver missed packet */ 145 146 /* detailed tx_errors */ 147 unsigned long tx_aborted_errors; 148 unsigned long tx_carrier_errors; 149 unsigned long tx_fifo_errors; 150 unsigned long tx_heartbeat_errors; 151 unsigned long tx_window_errors; 152 153 /* for cslip etc */ 154 unsigned long rx_compressed; 155 unsigned long tx_compressed; 156 }; 157 158 159 /* Media selection options. */ 160 enum { 161 IF_PORT_UNKNOWN = 0, 162 IF_PORT_10BASE2, 163 IF_PORT_10BASET, 164 IF_PORT_AUI, 165 IF_PORT_100BASET, 166 IF_PORT_100BASETX, 167 IF_PORT_100BASEFX 168 }; 169 170 #ifdef __KERNEL__ 171 172 #include <linux/cache.h> 173 #include <linux/skbuff.h> 174 175 struct neighbour; 176 struct neigh_parms; 177 struct sk_buff; 178 179 struct netif_rx_stats 180 { 181 unsigned total; 182 unsigned dropped; 183 unsigned time_squeeze; 184 unsigned cpu_collision; 185 }; 186 187 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat); 188 189 struct dev_addr_list 190 { 191 struct dev_addr_list *next; 192 u8 da_addr[MAX_ADDR_LEN]; 193 u8 da_addrlen; 194 u8 da_synced; 195 int da_users; 196 int da_gusers; 197 }; 198 199 /* 200 * We tag multicasts with these structures. 201 */ 202 203 #define dev_mc_list dev_addr_list 204 #define dmi_addr da_addr 205 #define dmi_addrlen da_addrlen 206 #define dmi_users da_users 207 #define dmi_gusers da_gusers 208 209 struct hh_cache 210 { 211 struct hh_cache *hh_next; /* Next entry */ 212 atomic_t hh_refcnt; /* number of users */ 213 /* 214 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate 215 * cache line on SMP. 216 * They are mostly read, but hh_refcnt may be changed quite frequently, 217 * incurring cache line ping pongs. 218 */ 219 __be16 hh_type ____cacheline_aligned_in_smp; 220 /* protocol identifier, f.e ETH_P_IP 221 * NOTE: For VLANs, this will be the 222 * encapuslated type. --BLG 223 */ 224 u16 hh_len; /* length of header */ 225 int (*hh_output)(struct sk_buff *skb); 226 seqlock_t hh_lock; 227 228 /* cached hardware header; allow for machine alignment needs. */ 229 #define HH_DATA_MOD 16 230 #define HH_DATA_OFF(__len) \ 231 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) 232 #define HH_DATA_ALIGN(__len) \ 233 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) 234 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; 235 }; 236 237 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much. 238 * Alternative is: 239 * dev->hard_header_len ? (dev->hard_header_len + 240 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 241 * 242 * We could use other alignment values, but we must maintain the 243 * relationship HH alignment <= LL alignment. 244 * 245 * LL_ALLOCATED_SPACE also takes into account the tailroom the device 246 * may need. 247 */ 248 #define LL_RESERVED_SPACE(dev) \ 249 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 250 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 251 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 252 #define LL_ALLOCATED_SPACE(dev) \ 253 ((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 254 255 struct header_ops { 256 int (*create) (struct sk_buff *skb, struct net_device *dev, 257 unsigned short type, const void *daddr, 258 const void *saddr, unsigned len); 259 int (*parse)(const struct sk_buff *skb, unsigned char *haddr); 260 int (*rebuild)(struct sk_buff *skb); 261 #define HAVE_HEADER_CACHE 262 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh); 263 void (*cache_update)(struct hh_cache *hh, 264 const struct net_device *dev, 265 const unsigned char *haddr); 266 }; 267 268 /* These flag bits are private to the generic network queueing 269 * layer, they may not be explicitly referenced by any other 270 * code. 271 */ 272 273 enum netdev_state_t 274 { 275 __LINK_STATE_START, 276 __LINK_STATE_PRESENT, 277 __LINK_STATE_NOCARRIER, 278 __LINK_STATE_LINKWATCH_PENDING, 279 __LINK_STATE_DORMANT, 280 }; 281 282 283 /* 284 * This structure holds at boot time configured netdevice settings. They 285 * are then used in the device probing. 286 */ 287 struct netdev_boot_setup { 288 char name[IFNAMSIZ]; 289 struct ifmap map; 290 }; 291 #define NETDEV_BOOT_SETUP_MAX 8 292 293 extern int __init netdev_boot_setup(char *str); 294 295 /* 296 * Structure for NAPI scheduling similar to tasklet but with weighting 297 */ 298 struct napi_struct { 299 /* The poll_list must only be managed by the entity which 300 * changes the state of the NAPI_STATE_SCHED bit. This means 301 * whoever atomically sets that bit can add this napi_struct 302 * to the per-cpu poll_list, and whoever clears that bit 303 * can remove from the list right before clearing the bit. 304 */ 305 struct list_head poll_list; 306 307 unsigned long state; 308 int weight; 309 int (*poll)(struct napi_struct *, int); 310 #ifdef CONFIG_NETPOLL 311 spinlock_t poll_lock; 312 int poll_owner; 313 struct net_device *dev; 314 struct list_head dev_list; 315 #endif 316 }; 317 318 enum 319 { 320 NAPI_STATE_SCHED, /* Poll is scheduled */ 321 NAPI_STATE_DISABLE, /* Disable pending */ 322 NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */ 323 }; 324 325 extern void __napi_schedule(struct napi_struct *n); 326 327 static inline int napi_disable_pending(struct napi_struct *n) 328 { 329 return test_bit(NAPI_STATE_DISABLE, &n->state); 330 } 331 332 /** 333 * napi_schedule_prep - check if napi can be scheduled 334 * @n: napi context 335 * 336 * Test if NAPI routine is already running, and if not mark 337 * it as running. This is used as a condition variable 338 * insure only one NAPI poll instance runs. We also make 339 * sure there is no pending NAPI disable. 340 */ 341 static inline int napi_schedule_prep(struct napi_struct *n) 342 { 343 return !napi_disable_pending(n) && 344 !test_and_set_bit(NAPI_STATE_SCHED, &n->state); 345 } 346 347 /** 348 * napi_schedule - schedule NAPI poll 349 * @n: napi context 350 * 351 * Schedule NAPI poll routine to be called if it is not already 352 * running. 353 */ 354 static inline void napi_schedule(struct napi_struct *n) 355 { 356 if (napi_schedule_prep(n)) 357 __napi_schedule(n); 358 } 359 360 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */ 361 static inline int napi_reschedule(struct napi_struct *napi) 362 { 363 if (napi_schedule_prep(napi)) { 364 __napi_schedule(napi); 365 return 1; 366 } 367 return 0; 368 } 369 370 /** 371 * napi_complete - NAPI processing complete 372 * @n: napi context 373 * 374 * Mark NAPI processing as complete. 375 */ 376 static inline void __napi_complete(struct napi_struct *n) 377 { 378 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); 379 list_del(&n->poll_list); 380 smp_mb__before_clear_bit(); 381 clear_bit(NAPI_STATE_SCHED, &n->state); 382 } 383 384 static inline void napi_complete(struct napi_struct *n) 385 { 386 unsigned long flags; 387 388 local_irq_save(flags); 389 __napi_complete(n); 390 local_irq_restore(flags); 391 } 392 393 /** 394 * napi_disable - prevent NAPI from scheduling 395 * @n: napi context 396 * 397 * Stop NAPI from being scheduled on this context. 398 * Waits till any outstanding processing completes. 399 */ 400 static inline void napi_disable(struct napi_struct *n) 401 { 402 set_bit(NAPI_STATE_DISABLE, &n->state); 403 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state)) 404 msleep(1); 405 clear_bit(NAPI_STATE_DISABLE, &n->state); 406 } 407 408 /** 409 * napi_enable - enable NAPI scheduling 410 * @n: napi context 411 * 412 * Resume NAPI from being scheduled on this context. 413 * Must be paired with napi_disable. 414 */ 415 static inline void napi_enable(struct napi_struct *n) 416 { 417 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); 418 smp_mb__before_clear_bit(); 419 clear_bit(NAPI_STATE_SCHED, &n->state); 420 } 421 422 #ifdef CONFIG_SMP 423 /** 424 * napi_synchronize - wait until NAPI is not running 425 * @n: napi context 426 * 427 * Wait until NAPI is done being scheduled on this context. 428 * Waits till any outstanding processing completes but 429 * does not disable future activations. 430 */ 431 static inline void napi_synchronize(const struct napi_struct *n) 432 { 433 while (test_bit(NAPI_STATE_SCHED, &n->state)) 434 msleep(1); 435 } 436 #else 437 # define napi_synchronize(n) barrier() 438 #endif 439 440 enum netdev_queue_state_t 441 { 442 __QUEUE_STATE_XOFF, 443 __QUEUE_STATE_FROZEN, 444 }; 445 446 struct netdev_queue { 447 struct net_device *dev; 448 struct Qdisc *qdisc; 449 unsigned long state; 450 spinlock_t _xmit_lock; 451 int xmit_lock_owner; 452 struct Qdisc *qdisc_sleeping; 453 } ____cacheline_aligned_in_smp; 454 455 /* 456 * The DEVICE structure. 457 * Actually, this whole structure is a big mistake. It mixes I/O 458 * data with strictly "high-level" data, and it has to know about 459 * almost every data structure used in the INET module. 460 * 461 * FIXME: cleanup struct net_device such that network protocol info 462 * moves out. 463 */ 464 465 struct net_device 466 { 467 468 /* 469 * This is the first field of the "visible" part of this structure 470 * (i.e. as seen by users in the "Space.c" file). It is the name 471 * the interface. 472 */ 473 char name[IFNAMSIZ]; 474 /* device name hash chain */ 475 struct hlist_node name_hlist; 476 /* snmp alias */ 477 char *ifalias; 478 479 /* 480 * I/O specific fields 481 * FIXME: Merge these and struct ifmap into one 482 */ 483 unsigned long mem_end; /* shared mem end */ 484 unsigned long mem_start; /* shared mem start */ 485 unsigned long base_addr; /* device I/O address */ 486 unsigned int irq; /* device IRQ number */ 487 488 /* 489 * Some hardware also needs these fields, but they are not 490 * part of the usual set specified in Space.c. 491 */ 492 493 unsigned char if_port; /* Selectable AUI, TP,..*/ 494 unsigned char dma; /* DMA channel */ 495 496 unsigned long state; 497 498 struct list_head dev_list; 499 #ifdef CONFIG_NETPOLL 500 struct list_head napi_list; 501 #endif 502 503 /* The device initialization function. Called only once. */ 504 int (*init)(struct net_device *dev); 505 506 /* ------- Fields preinitialized in Space.c finish here ------- */ 507 508 /* Net device features */ 509 unsigned long features; 510 #define NETIF_F_SG 1 /* Scatter/gather IO. */ 511 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */ 512 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ 513 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ 514 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */ 515 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ 516 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ 517 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ 518 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ 519 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ 520 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ 521 #define NETIF_F_GSO 2048 /* Enable software GSO. */ 522 #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */ 523 /* do not use LLTX in new drivers */ 524 #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */ 525 #define NETIF_F_LRO 32768 /* large receive offload */ 526 527 /* Segmentation offload features */ 528 #define NETIF_F_GSO_SHIFT 16 529 #define NETIF_F_GSO_MASK 0xffff0000 530 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT) 531 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT) 532 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT) 533 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT) 534 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT) 535 536 /* List of features with software fallbacks. */ 537 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6) 538 539 540 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM) 541 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM) 542 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM) 543 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM) 544 545 /* 546 * If one device supports one of these features, then enable them 547 * for all in netdev_increment_features. 548 */ 549 #define NETIF_F_ONE_FOR_ALL (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \ 550 NETIF_F_SG | NETIF_F_HIGHDMA | \ 551 NETIF_F_FRAGLIST) 552 553 /* Interface index. Unique device identifier */ 554 int ifindex; 555 int iflink; 556 557 558 struct net_device_stats* (*get_stats)(struct net_device *dev); 559 struct net_device_stats stats; 560 561 #ifdef CONFIG_WIRELESS_EXT 562 /* List of functions to handle Wireless Extensions (instead of ioctl). 563 * See <net/iw_handler.h> for details. Jean II */ 564 const struct iw_handler_def * wireless_handlers; 565 /* Instance data managed by the core of Wireless Extensions. */ 566 struct iw_public_data * wireless_data; 567 #endif 568 const struct ethtool_ops *ethtool_ops; 569 570 /* Hardware header description */ 571 const struct header_ops *header_ops; 572 573 /* 574 * This marks the end of the "visible" part of the structure. All 575 * fields hereafter are internal to the system, and may change at 576 * will (read: may be cleaned up at will). 577 */ 578 579 580 unsigned int flags; /* interface flags (a la BSD) */ 581 unsigned short gflags; 582 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ 583 unsigned short padded; /* How much padding added by alloc_netdev() */ 584 585 unsigned char operstate; /* RFC2863 operstate */ 586 unsigned char link_mode; /* mapping policy to operstate */ 587 588 unsigned mtu; /* interface MTU value */ 589 unsigned short type; /* interface hardware type */ 590 unsigned short hard_header_len; /* hardware hdr length */ 591 592 /* extra head- and tailroom the hardware may need, but not in all cases 593 * can this be guaranteed, especially tailroom. Some cases also use 594 * LL_MAX_HEADER instead to allocate the skb. 595 */ 596 unsigned short needed_headroom; 597 unsigned short needed_tailroom; 598 599 struct net_device *master; /* Pointer to master device of a group, 600 * which this device is member of. 601 */ 602 603 /* Interface address info. */ 604 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ 605 unsigned char addr_len; /* hardware address length */ 606 unsigned short dev_id; /* for shared network cards */ 607 608 spinlock_t addr_list_lock; 609 struct dev_addr_list *uc_list; /* Secondary unicast mac addresses */ 610 int uc_count; /* Number of installed ucasts */ 611 int uc_promisc; 612 struct dev_addr_list *mc_list; /* Multicast mac addresses */ 613 int mc_count; /* Number of installed mcasts */ 614 unsigned int promiscuity; 615 unsigned int allmulti; 616 617 618 /* Protocol specific pointers */ 619 620 #ifdef CONFIG_NET_DSA 621 void *dsa_ptr; /* dsa specific data */ 622 #endif 623 void *atalk_ptr; /* AppleTalk link */ 624 void *ip_ptr; /* IPv4 specific data */ 625 void *dn_ptr; /* DECnet specific data */ 626 void *ip6_ptr; /* IPv6 specific data */ 627 void *ec_ptr; /* Econet specific data */ 628 void *ax25_ptr; /* AX.25 specific data */ 629 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data, 630 assign before registering */ 631 632 /* 633 * Cache line mostly used on receive path (including eth_type_trans()) 634 */ 635 unsigned long last_rx; /* Time of last Rx */ 636 /* Interface address info used in eth_type_trans() */ 637 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast 638 because most packets are unicast) */ 639 640 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 641 642 struct netdev_queue rx_queue; 643 644 struct netdev_queue *_tx ____cacheline_aligned_in_smp; 645 646 /* Number of TX queues allocated at alloc_netdev_mq() time */ 647 unsigned int num_tx_queues; 648 649 /* Number of TX queues currently active in device */ 650 unsigned int real_num_tx_queues; 651 652 unsigned long tx_queue_len; /* Max frames per queue allowed */ 653 spinlock_t tx_global_lock; 654 /* 655 * One part is mostly used on xmit path (device) 656 */ 657 void *priv; /* pointer to private data */ 658 int (*hard_start_xmit) (struct sk_buff *skb, 659 struct net_device *dev); 660 /* These may be needed for future network-power-down code. */ 661 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 662 663 int watchdog_timeo; /* used by dev_watchdog() */ 664 struct timer_list watchdog_timer; 665 666 /* 667 * refcnt is a very hot point, so align it on SMP 668 */ 669 /* Number of references to this device */ 670 atomic_t refcnt ____cacheline_aligned_in_smp; 671 672 /* delayed register/unregister */ 673 struct list_head todo_list; 674 /* device index hash chain */ 675 struct hlist_node index_hlist; 676 677 struct net_device *link_watch_next; 678 679 /* register/unregister state machine */ 680 enum { NETREG_UNINITIALIZED=0, 681 NETREG_REGISTERED, /* completed register_netdevice */ 682 NETREG_UNREGISTERING, /* called unregister_netdevice */ 683 NETREG_UNREGISTERED, /* completed unregister todo */ 684 NETREG_RELEASED, /* called free_netdev */ 685 } reg_state; 686 687 /* Called after device is detached from network. */ 688 void (*uninit)(struct net_device *dev); 689 /* Called after last user reference disappears. */ 690 void (*destructor)(struct net_device *dev); 691 692 /* Pointers to interface service routines. */ 693 int (*open)(struct net_device *dev); 694 int (*stop)(struct net_device *dev); 695 #define HAVE_NETDEV_POLL 696 #define HAVE_CHANGE_RX_FLAGS 697 void (*change_rx_flags)(struct net_device *dev, 698 int flags); 699 #define HAVE_SET_RX_MODE 700 void (*set_rx_mode)(struct net_device *dev); 701 #define HAVE_MULTICAST 702 void (*set_multicast_list)(struct net_device *dev); 703 #define HAVE_SET_MAC_ADDR 704 int (*set_mac_address)(struct net_device *dev, 705 void *addr); 706 #define HAVE_VALIDATE_ADDR 707 int (*validate_addr)(struct net_device *dev); 708 #define HAVE_PRIVATE_IOCTL 709 int (*do_ioctl)(struct net_device *dev, 710 struct ifreq *ifr, int cmd); 711 #define HAVE_SET_CONFIG 712 int (*set_config)(struct net_device *dev, 713 struct ifmap *map); 714 #define HAVE_CHANGE_MTU 715 int (*change_mtu)(struct net_device *dev, int new_mtu); 716 717 #define HAVE_TX_TIMEOUT 718 void (*tx_timeout) (struct net_device *dev); 719 720 void (*vlan_rx_register)(struct net_device *dev, 721 struct vlan_group *grp); 722 void (*vlan_rx_add_vid)(struct net_device *dev, 723 unsigned short vid); 724 void (*vlan_rx_kill_vid)(struct net_device *dev, 725 unsigned short vid); 726 727 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *); 728 #ifdef CONFIG_NETPOLL 729 struct netpoll_info *npinfo; 730 #endif 731 #ifdef CONFIG_NET_POLL_CONTROLLER 732 void (*poll_controller)(struct net_device *dev); 733 #endif 734 735 u16 (*select_queue)(struct net_device *dev, 736 struct sk_buff *skb); 737 738 #ifdef CONFIG_NET_NS 739 /* Network namespace this network device is inside */ 740 struct net *nd_net; 741 #endif 742 743 /* mid-layer private */ 744 void *ml_priv; 745 746 /* bridge stuff */ 747 struct net_bridge_port *br_port; 748 /* macvlan */ 749 struct macvlan_port *macvlan_port; 750 /* GARP */ 751 struct garp_port *garp_port; 752 753 /* class/net/name entry */ 754 struct device dev; 755 /* space for optional statistics and wireless sysfs groups */ 756 struct attribute_group *sysfs_groups[3]; 757 758 /* rtnetlink link ops */ 759 const struct rtnl_link_ops *rtnl_link_ops; 760 761 /* VLAN feature mask */ 762 unsigned long vlan_features; 763 764 /* for setting kernel sock attribute on TCP connection setup */ 765 #define GSO_MAX_SIZE 65536 766 unsigned int gso_max_size; 767 }; 768 #define to_net_dev(d) container_of(d, struct net_device, dev) 769 770 #define NETDEV_ALIGN 32 771 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1) 772 773 static inline 774 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev, 775 unsigned int index) 776 { 777 return &dev->_tx[index]; 778 } 779 780 static inline void netdev_for_each_tx_queue(struct net_device *dev, 781 void (*f)(struct net_device *, 782 struct netdev_queue *, 783 void *), 784 void *arg) 785 { 786 unsigned int i; 787 788 for (i = 0; i < dev->num_tx_queues; i++) 789 f(dev, &dev->_tx[i], arg); 790 } 791 792 /* 793 * Net namespace inlines 794 */ 795 static inline 796 struct net *dev_net(const struct net_device *dev) 797 { 798 #ifdef CONFIG_NET_NS 799 return dev->nd_net; 800 #else 801 return &init_net; 802 #endif 803 } 804 805 static inline 806 void dev_net_set(struct net_device *dev, struct net *net) 807 { 808 #ifdef CONFIG_NET_NS 809 release_net(dev->nd_net); 810 dev->nd_net = hold_net(net); 811 #endif 812 } 813 814 static inline bool netdev_uses_dsa_tags(struct net_device *dev) 815 { 816 #ifdef CONFIG_NET_DSA_TAG_DSA 817 if (dev->dsa_ptr != NULL) 818 return dsa_uses_dsa_tags(dev->dsa_ptr); 819 #endif 820 821 return 0; 822 } 823 824 static inline bool netdev_uses_trailer_tags(struct net_device *dev) 825 { 826 #ifdef CONFIG_NET_DSA_TAG_TRAILER 827 if (dev->dsa_ptr != NULL) 828 return dsa_uses_trailer_tags(dev->dsa_ptr); 829 #endif 830 831 return 0; 832 } 833 834 /** 835 * netdev_priv - access network device private data 836 * @dev: network device 837 * 838 * Get network device private data 839 */ 840 static inline void *netdev_priv(const struct net_device *dev) 841 { 842 return (char *)dev + ((sizeof(struct net_device) 843 + NETDEV_ALIGN_CONST) 844 & ~NETDEV_ALIGN_CONST); 845 } 846 847 /* Set the sysfs physical device reference for the network logical device 848 * if set prior to registration will cause a symlink during initialization. 849 */ 850 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) 851 852 /** 853 * netif_napi_add - initialize a napi context 854 * @dev: network device 855 * @napi: napi context 856 * @poll: polling function 857 * @weight: default weight 858 * 859 * netif_napi_add() must be used to initialize a napi context prior to calling 860 * *any* of the other napi related functions. 861 */ 862 static inline void netif_napi_add(struct net_device *dev, 863 struct napi_struct *napi, 864 int (*poll)(struct napi_struct *, int), 865 int weight) 866 { 867 INIT_LIST_HEAD(&napi->poll_list); 868 napi->poll = poll; 869 napi->weight = weight; 870 #ifdef CONFIG_NETPOLL 871 napi->dev = dev; 872 list_add(&napi->dev_list, &dev->napi_list); 873 spin_lock_init(&napi->poll_lock); 874 napi->poll_owner = -1; 875 #endif 876 set_bit(NAPI_STATE_SCHED, &napi->state); 877 } 878 879 /** 880 * netif_napi_del - remove a napi context 881 * @napi: napi context 882 * 883 * netif_napi_del() removes a napi context from the network device napi list 884 */ 885 static inline void netif_napi_del(struct napi_struct *napi) 886 { 887 #ifdef CONFIG_NETPOLL 888 list_del(&napi->dev_list); 889 #endif 890 } 891 892 struct packet_type { 893 __be16 type; /* This is really htons(ether_type). */ 894 struct net_device *dev; /* NULL is wildcarded here */ 895 int (*func) (struct sk_buff *, 896 struct net_device *, 897 struct packet_type *, 898 struct net_device *); 899 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 900 int features); 901 int (*gso_send_check)(struct sk_buff *skb); 902 void *af_packet_priv; 903 struct list_head list; 904 }; 905 906 #include <linux/interrupt.h> 907 #include <linux/notifier.h> 908 909 extern rwlock_t dev_base_lock; /* Device list lock */ 910 911 912 #define for_each_netdev(net, d) \ 913 list_for_each_entry(d, &(net)->dev_base_head, dev_list) 914 #define for_each_netdev_safe(net, d, n) \ 915 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list) 916 #define for_each_netdev_continue(net, d) \ 917 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list) 918 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) 919 920 static inline struct net_device *next_net_device(struct net_device *dev) 921 { 922 struct list_head *lh; 923 struct net *net; 924 925 net = dev_net(dev); 926 lh = dev->dev_list.next; 927 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 928 } 929 930 static inline struct net_device *first_net_device(struct net *net) 931 { 932 return list_empty(&net->dev_base_head) ? NULL : 933 net_device_entry(net->dev_base_head.next); 934 } 935 936 extern int netdev_boot_setup_check(struct net_device *dev); 937 extern unsigned long netdev_boot_base(const char *prefix, int unit); 938 extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr); 939 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type); 940 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type); 941 extern void dev_add_pack(struct packet_type *pt); 942 extern void dev_remove_pack(struct packet_type *pt); 943 extern void __dev_remove_pack(struct packet_type *pt); 944 945 extern struct net_device *dev_get_by_flags(struct net *net, unsigned short flags, 946 unsigned short mask); 947 extern struct net_device *dev_get_by_name(struct net *net, const char *name); 948 extern struct net_device *__dev_get_by_name(struct net *net, const char *name); 949 extern int dev_alloc_name(struct net_device *dev, const char *name); 950 extern int dev_open(struct net_device *dev); 951 extern int dev_close(struct net_device *dev); 952 extern void dev_disable_lro(struct net_device *dev); 953 extern int dev_queue_xmit(struct sk_buff *skb); 954 extern int register_netdevice(struct net_device *dev); 955 extern void unregister_netdevice(struct net_device *dev); 956 extern void free_netdev(struct net_device *dev); 957 extern void synchronize_net(void); 958 extern int register_netdevice_notifier(struct notifier_block *nb); 959 extern int unregister_netdevice_notifier(struct notifier_block *nb); 960 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev); 961 extern struct net_device *dev_get_by_index(struct net *net, int ifindex); 962 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex); 963 extern int dev_restart(struct net_device *dev); 964 #ifdef CONFIG_NETPOLL_TRAP 965 extern int netpoll_trap(void); 966 #endif 967 968 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, 969 unsigned short type, 970 const void *daddr, const void *saddr, 971 unsigned len) 972 { 973 if (!dev->header_ops || !dev->header_ops->create) 974 return 0; 975 976 return dev->header_ops->create(skb, dev, type, daddr, saddr, len); 977 } 978 979 static inline int dev_parse_header(const struct sk_buff *skb, 980 unsigned char *haddr) 981 { 982 const struct net_device *dev = skb->dev; 983 984 if (!dev->header_ops || !dev->header_ops->parse) 985 return 0; 986 return dev->header_ops->parse(skb, haddr); 987 } 988 989 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 990 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 991 static inline int unregister_gifconf(unsigned int family) 992 { 993 return register_gifconf(family, NULL); 994 } 995 996 /* 997 * Incoming packets are placed on per-cpu queues so that 998 * no locking is needed. 999 */ 1000 struct softnet_data 1001 { 1002 struct Qdisc *output_queue; 1003 struct sk_buff_head input_pkt_queue; 1004 struct list_head poll_list; 1005 struct sk_buff *completion_queue; 1006 1007 struct napi_struct backlog; 1008 #ifdef CONFIG_NET_DMA 1009 struct dma_chan *net_dma; 1010 #endif 1011 }; 1012 1013 DECLARE_PER_CPU(struct softnet_data,softnet_data); 1014 1015 #define HAVE_NETIF_QUEUE 1016 1017 extern void __netif_schedule(struct Qdisc *q); 1018 1019 static inline void netif_schedule_queue(struct netdev_queue *txq) 1020 { 1021 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state)) 1022 __netif_schedule(txq->qdisc); 1023 } 1024 1025 static inline void netif_tx_schedule_all(struct net_device *dev) 1026 { 1027 unsigned int i; 1028 1029 for (i = 0; i < dev->num_tx_queues; i++) 1030 netif_schedule_queue(netdev_get_tx_queue(dev, i)); 1031 } 1032 1033 static inline void netif_tx_start_queue(struct netdev_queue *dev_queue) 1034 { 1035 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1036 } 1037 1038 /** 1039 * netif_start_queue - allow transmit 1040 * @dev: network device 1041 * 1042 * Allow upper layers to call the device hard_start_xmit routine. 1043 */ 1044 static inline void netif_start_queue(struct net_device *dev) 1045 { 1046 netif_tx_start_queue(netdev_get_tx_queue(dev, 0)); 1047 } 1048 1049 static inline void netif_tx_start_all_queues(struct net_device *dev) 1050 { 1051 unsigned int i; 1052 1053 for (i = 0; i < dev->num_tx_queues; i++) { 1054 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1055 netif_tx_start_queue(txq); 1056 } 1057 } 1058 1059 static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue) 1060 { 1061 #ifdef CONFIG_NETPOLL_TRAP 1062 if (netpoll_trap()) { 1063 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1064 return; 1065 } 1066 #endif 1067 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state)) 1068 __netif_schedule(dev_queue->qdisc); 1069 } 1070 1071 /** 1072 * netif_wake_queue - restart transmit 1073 * @dev: network device 1074 * 1075 * Allow upper layers to call the device hard_start_xmit routine. 1076 * Used for flow control when transmit resources are available. 1077 */ 1078 static inline void netif_wake_queue(struct net_device *dev) 1079 { 1080 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0)); 1081 } 1082 1083 static inline void netif_tx_wake_all_queues(struct net_device *dev) 1084 { 1085 unsigned int i; 1086 1087 for (i = 0; i < dev->num_tx_queues; i++) { 1088 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1089 netif_tx_wake_queue(txq); 1090 } 1091 } 1092 1093 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue) 1094 { 1095 set_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1096 } 1097 1098 /** 1099 * netif_stop_queue - stop transmitted packets 1100 * @dev: network device 1101 * 1102 * Stop upper layers calling the device hard_start_xmit routine. 1103 * Used for flow control when transmit resources are unavailable. 1104 */ 1105 static inline void netif_stop_queue(struct net_device *dev) 1106 { 1107 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0)); 1108 } 1109 1110 static inline void netif_tx_stop_all_queues(struct net_device *dev) 1111 { 1112 unsigned int i; 1113 1114 for (i = 0; i < dev->num_tx_queues; i++) { 1115 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1116 netif_tx_stop_queue(txq); 1117 } 1118 } 1119 1120 static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue) 1121 { 1122 return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1123 } 1124 1125 /** 1126 * netif_queue_stopped - test if transmit queue is flowblocked 1127 * @dev: network device 1128 * 1129 * Test if transmit queue on device is currently unable to send. 1130 */ 1131 static inline int netif_queue_stopped(const struct net_device *dev) 1132 { 1133 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0)); 1134 } 1135 1136 static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue) 1137 { 1138 return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state); 1139 } 1140 1141 /** 1142 * netif_running - test if up 1143 * @dev: network device 1144 * 1145 * Test if the device has been brought up. 1146 */ 1147 static inline int netif_running(const struct net_device *dev) 1148 { 1149 return test_bit(__LINK_STATE_START, &dev->state); 1150 } 1151 1152 /* 1153 * Routines to manage the subqueues on a device. We only need start 1154 * stop, and a check if it's stopped. All other device management is 1155 * done at the overall netdevice level. 1156 * Also test the device if we're multiqueue. 1157 */ 1158 1159 /** 1160 * netif_start_subqueue - allow sending packets on subqueue 1161 * @dev: network device 1162 * @queue_index: sub queue index 1163 * 1164 * Start individual transmit queue of a device with multiple transmit queues. 1165 */ 1166 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 1167 { 1168 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1169 clear_bit(__QUEUE_STATE_XOFF, &txq->state); 1170 } 1171 1172 /** 1173 * netif_stop_subqueue - stop sending packets on subqueue 1174 * @dev: network device 1175 * @queue_index: sub queue index 1176 * 1177 * Stop individual transmit queue of a device with multiple transmit queues. 1178 */ 1179 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 1180 { 1181 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1182 #ifdef CONFIG_NETPOLL_TRAP 1183 if (netpoll_trap()) 1184 return; 1185 #endif 1186 set_bit(__QUEUE_STATE_XOFF, &txq->state); 1187 } 1188 1189 /** 1190 * netif_subqueue_stopped - test status of subqueue 1191 * @dev: network device 1192 * @queue_index: sub queue index 1193 * 1194 * Check individual transmit queue of a device with multiple transmit queues. 1195 */ 1196 static inline int __netif_subqueue_stopped(const struct net_device *dev, 1197 u16 queue_index) 1198 { 1199 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1200 return test_bit(__QUEUE_STATE_XOFF, &txq->state); 1201 } 1202 1203 static inline int netif_subqueue_stopped(const struct net_device *dev, 1204 struct sk_buff *skb) 1205 { 1206 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb)); 1207 } 1208 1209 /** 1210 * netif_wake_subqueue - allow sending packets on subqueue 1211 * @dev: network device 1212 * @queue_index: sub queue index 1213 * 1214 * Resume individual transmit queue of a device with multiple transmit queues. 1215 */ 1216 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 1217 { 1218 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1219 #ifdef CONFIG_NETPOLL_TRAP 1220 if (netpoll_trap()) 1221 return; 1222 #endif 1223 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state)) 1224 __netif_schedule(txq->qdisc); 1225 } 1226 1227 /** 1228 * netif_is_multiqueue - test if device has multiple transmit queues 1229 * @dev: network device 1230 * 1231 * Check if device has multiple transmit queues 1232 */ 1233 static inline int netif_is_multiqueue(const struct net_device *dev) 1234 { 1235 return (dev->num_tx_queues > 1); 1236 } 1237 1238 /* Use this variant when it is known for sure that it 1239 * is executing from hardware interrupt context or with hardware interrupts 1240 * disabled. 1241 */ 1242 extern void dev_kfree_skb_irq(struct sk_buff *skb); 1243 1244 /* Use this variant in places where it could be invoked 1245 * from either hardware interrupt or other context, with hardware interrupts 1246 * either disabled or enabled. 1247 */ 1248 extern void dev_kfree_skb_any(struct sk_buff *skb); 1249 1250 #define HAVE_NETIF_RX 1 1251 extern int netif_rx(struct sk_buff *skb); 1252 extern int netif_rx_ni(struct sk_buff *skb); 1253 #define HAVE_NETIF_RECEIVE_SKB 1 1254 extern int netif_receive_skb(struct sk_buff *skb); 1255 extern void netif_nit_deliver(struct sk_buff *skb); 1256 extern int dev_valid_name(const char *name); 1257 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *); 1258 extern int dev_ethtool(struct net *net, struct ifreq *); 1259 extern unsigned dev_get_flags(const struct net_device *); 1260 extern int dev_change_flags(struct net_device *, unsigned); 1261 extern int dev_change_name(struct net_device *, const char *); 1262 extern int dev_set_alias(struct net_device *, const char *, size_t); 1263 extern int dev_change_net_namespace(struct net_device *, 1264 struct net *, const char *); 1265 extern int dev_set_mtu(struct net_device *, int); 1266 extern int dev_set_mac_address(struct net_device *, 1267 struct sockaddr *); 1268 extern int dev_hard_start_xmit(struct sk_buff *skb, 1269 struct net_device *dev, 1270 struct netdev_queue *txq); 1271 1272 extern int netdev_budget; 1273 1274 /* Called by rtnetlink.c:rtnl_unlock() */ 1275 extern void netdev_run_todo(void); 1276 1277 /** 1278 * dev_put - release reference to device 1279 * @dev: network device 1280 * 1281 * Release reference to device to allow it to be freed. 1282 */ 1283 static inline void dev_put(struct net_device *dev) 1284 { 1285 atomic_dec(&dev->refcnt); 1286 } 1287 1288 /** 1289 * dev_hold - get reference to device 1290 * @dev: network device 1291 * 1292 * Hold reference to device to keep it from being freed. 1293 */ 1294 static inline void dev_hold(struct net_device *dev) 1295 { 1296 atomic_inc(&dev->refcnt); 1297 } 1298 1299 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 1300 * and _off may be called from IRQ context, but it is caller 1301 * who is responsible for serialization of these calls. 1302 * 1303 * The name carrier is inappropriate, these functions should really be 1304 * called netif_lowerlayer_*() because they represent the state of any 1305 * kind of lower layer not just hardware media. 1306 */ 1307 1308 extern void linkwatch_fire_event(struct net_device *dev); 1309 1310 /** 1311 * netif_carrier_ok - test if carrier present 1312 * @dev: network device 1313 * 1314 * Check if carrier is present on device 1315 */ 1316 static inline int netif_carrier_ok(const struct net_device *dev) 1317 { 1318 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 1319 } 1320 1321 extern void __netdev_watchdog_up(struct net_device *dev); 1322 1323 extern void netif_carrier_on(struct net_device *dev); 1324 1325 extern void netif_carrier_off(struct net_device *dev); 1326 1327 /** 1328 * netif_dormant_on - mark device as dormant. 1329 * @dev: network device 1330 * 1331 * Mark device as dormant (as per RFC2863). 1332 * 1333 * The dormant state indicates that the relevant interface is not 1334 * actually in a condition to pass packets (i.e., it is not 'up') but is 1335 * in a "pending" state, waiting for some external event. For "on- 1336 * demand" interfaces, this new state identifies the situation where the 1337 * interface is waiting for events to place it in the up state. 1338 * 1339 */ 1340 static inline void netif_dormant_on(struct net_device *dev) 1341 { 1342 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 1343 linkwatch_fire_event(dev); 1344 } 1345 1346 /** 1347 * netif_dormant_off - set device as not dormant. 1348 * @dev: network device 1349 * 1350 * Device is not in dormant state. 1351 */ 1352 static inline void netif_dormant_off(struct net_device *dev) 1353 { 1354 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 1355 linkwatch_fire_event(dev); 1356 } 1357 1358 /** 1359 * netif_dormant - test if carrier present 1360 * @dev: network device 1361 * 1362 * Check if carrier is present on device 1363 */ 1364 static inline int netif_dormant(const struct net_device *dev) 1365 { 1366 return test_bit(__LINK_STATE_DORMANT, &dev->state); 1367 } 1368 1369 1370 /** 1371 * netif_oper_up - test if device is operational 1372 * @dev: network device 1373 * 1374 * Check if carrier is operational 1375 */ 1376 static inline int netif_oper_up(const struct net_device *dev) { 1377 return (dev->operstate == IF_OPER_UP || 1378 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 1379 } 1380 1381 /** 1382 * netif_device_present - is device available or removed 1383 * @dev: network device 1384 * 1385 * Check if device has not been removed from system. 1386 */ 1387 static inline int netif_device_present(struct net_device *dev) 1388 { 1389 return test_bit(__LINK_STATE_PRESENT, &dev->state); 1390 } 1391 1392 extern void netif_device_detach(struct net_device *dev); 1393 1394 extern void netif_device_attach(struct net_device *dev); 1395 1396 /* 1397 * Network interface message level settings 1398 */ 1399 #define HAVE_NETIF_MSG 1 1400 1401 enum { 1402 NETIF_MSG_DRV = 0x0001, 1403 NETIF_MSG_PROBE = 0x0002, 1404 NETIF_MSG_LINK = 0x0004, 1405 NETIF_MSG_TIMER = 0x0008, 1406 NETIF_MSG_IFDOWN = 0x0010, 1407 NETIF_MSG_IFUP = 0x0020, 1408 NETIF_MSG_RX_ERR = 0x0040, 1409 NETIF_MSG_TX_ERR = 0x0080, 1410 NETIF_MSG_TX_QUEUED = 0x0100, 1411 NETIF_MSG_INTR = 0x0200, 1412 NETIF_MSG_TX_DONE = 0x0400, 1413 NETIF_MSG_RX_STATUS = 0x0800, 1414 NETIF_MSG_PKTDATA = 0x1000, 1415 NETIF_MSG_HW = 0x2000, 1416 NETIF_MSG_WOL = 0x4000, 1417 }; 1418 1419 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 1420 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 1421 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 1422 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 1423 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 1424 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 1425 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 1426 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 1427 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 1428 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 1429 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 1430 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 1431 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 1432 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 1433 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 1434 1435 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 1436 { 1437 /* use default */ 1438 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 1439 return default_msg_enable_bits; 1440 if (debug_value == 0) /* no output */ 1441 return 0; 1442 /* set low N bits */ 1443 return (1 << debug_value) - 1; 1444 } 1445 1446 /* Test if receive needs to be scheduled but only if up */ 1447 static inline int netif_rx_schedule_prep(struct net_device *dev, 1448 struct napi_struct *napi) 1449 { 1450 return napi_schedule_prep(napi); 1451 } 1452 1453 /* Add interface to tail of rx poll list. This assumes that _prep has 1454 * already been called and returned 1. 1455 */ 1456 static inline void __netif_rx_schedule(struct net_device *dev, 1457 struct napi_struct *napi) 1458 { 1459 __napi_schedule(napi); 1460 } 1461 1462 /* Try to reschedule poll. Called by irq handler. */ 1463 1464 static inline void netif_rx_schedule(struct net_device *dev, 1465 struct napi_struct *napi) 1466 { 1467 if (netif_rx_schedule_prep(dev, napi)) 1468 __netif_rx_schedule(dev, napi); 1469 } 1470 1471 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). */ 1472 static inline int netif_rx_reschedule(struct net_device *dev, 1473 struct napi_struct *napi) 1474 { 1475 if (napi_schedule_prep(napi)) { 1476 __netif_rx_schedule(dev, napi); 1477 return 1; 1478 } 1479 return 0; 1480 } 1481 1482 /* same as netif_rx_complete, except that local_irq_save(flags) 1483 * has already been issued 1484 */ 1485 static inline void __netif_rx_complete(struct net_device *dev, 1486 struct napi_struct *napi) 1487 { 1488 __napi_complete(napi); 1489 } 1490 1491 /* Remove interface from poll list: it must be in the poll list 1492 * on current cpu. This primitive is called by dev->poll(), when 1493 * it completes the work. The device cannot be out of poll list at this 1494 * moment, it is BUG(). 1495 */ 1496 static inline void netif_rx_complete(struct net_device *dev, 1497 struct napi_struct *napi) 1498 { 1499 unsigned long flags; 1500 1501 /* 1502 * don't let napi dequeue from the cpu poll list 1503 * just in case its running on a different cpu 1504 */ 1505 if (unlikely(test_bit(NAPI_STATE_NPSVC, &napi->state))) 1506 return; 1507 local_irq_save(flags); 1508 __netif_rx_complete(dev, napi); 1509 local_irq_restore(flags); 1510 } 1511 1512 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu) 1513 { 1514 spin_lock(&txq->_xmit_lock); 1515 txq->xmit_lock_owner = cpu; 1516 } 1517 1518 static inline void __netif_tx_lock_bh(struct netdev_queue *txq) 1519 { 1520 spin_lock_bh(&txq->_xmit_lock); 1521 txq->xmit_lock_owner = smp_processor_id(); 1522 } 1523 1524 static inline int __netif_tx_trylock(struct netdev_queue *txq) 1525 { 1526 int ok = spin_trylock(&txq->_xmit_lock); 1527 if (likely(ok)) 1528 txq->xmit_lock_owner = smp_processor_id(); 1529 return ok; 1530 } 1531 1532 static inline void __netif_tx_unlock(struct netdev_queue *txq) 1533 { 1534 txq->xmit_lock_owner = -1; 1535 spin_unlock(&txq->_xmit_lock); 1536 } 1537 1538 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq) 1539 { 1540 txq->xmit_lock_owner = -1; 1541 spin_unlock_bh(&txq->_xmit_lock); 1542 } 1543 1544 /** 1545 * netif_tx_lock - grab network device transmit lock 1546 * @dev: network device 1547 * 1548 * Get network device transmit lock 1549 */ 1550 static inline void netif_tx_lock(struct net_device *dev) 1551 { 1552 unsigned int i; 1553 int cpu; 1554 1555 spin_lock(&dev->tx_global_lock); 1556 cpu = smp_processor_id(); 1557 for (i = 0; i < dev->num_tx_queues; i++) { 1558 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1559 1560 /* We are the only thread of execution doing a 1561 * freeze, but we have to grab the _xmit_lock in 1562 * order to synchronize with threads which are in 1563 * the ->hard_start_xmit() handler and already 1564 * checked the frozen bit. 1565 */ 1566 __netif_tx_lock(txq, cpu); 1567 set_bit(__QUEUE_STATE_FROZEN, &txq->state); 1568 __netif_tx_unlock(txq); 1569 } 1570 } 1571 1572 static inline void netif_tx_lock_bh(struct net_device *dev) 1573 { 1574 local_bh_disable(); 1575 netif_tx_lock(dev); 1576 } 1577 1578 static inline void netif_tx_unlock(struct net_device *dev) 1579 { 1580 unsigned int i; 1581 1582 for (i = 0; i < dev->num_tx_queues; i++) { 1583 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1584 1585 /* No need to grab the _xmit_lock here. If the 1586 * queue is not stopped for another reason, we 1587 * force a schedule. 1588 */ 1589 clear_bit(__QUEUE_STATE_FROZEN, &txq->state); 1590 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state)) 1591 __netif_schedule(txq->qdisc); 1592 } 1593 spin_unlock(&dev->tx_global_lock); 1594 } 1595 1596 static inline void netif_tx_unlock_bh(struct net_device *dev) 1597 { 1598 netif_tx_unlock(dev); 1599 local_bh_enable(); 1600 } 1601 1602 #define HARD_TX_LOCK(dev, txq, cpu) { \ 1603 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1604 __netif_tx_lock(txq, cpu); \ 1605 } \ 1606 } 1607 1608 #define HARD_TX_UNLOCK(dev, txq) { \ 1609 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1610 __netif_tx_unlock(txq); \ 1611 } \ 1612 } 1613 1614 static inline void netif_tx_disable(struct net_device *dev) 1615 { 1616 unsigned int i; 1617 int cpu; 1618 1619 local_bh_disable(); 1620 cpu = smp_processor_id(); 1621 for (i = 0; i < dev->num_tx_queues; i++) { 1622 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1623 1624 __netif_tx_lock(txq, cpu); 1625 netif_tx_stop_queue(txq); 1626 __netif_tx_unlock(txq); 1627 } 1628 local_bh_enable(); 1629 } 1630 1631 static inline void netif_addr_lock(struct net_device *dev) 1632 { 1633 spin_lock(&dev->addr_list_lock); 1634 } 1635 1636 static inline void netif_addr_lock_bh(struct net_device *dev) 1637 { 1638 spin_lock_bh(&dev->addr_list_lock); 1639 } 1640 1641 static inline void netif_addr_unlock(struct net_device *dev) 1642 { 1643 spin_unlock(&dev->addr_list_lock); 1644 } 1645 1646 static inline void netif_addr_unlock_bh(struct net_device *dev) 1647 { 1648 spin_unlock_bh(&dev->addr_list_lock); 1649 } 1650 1651 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 1652 1653 extern void ether_setup(struct net_device *dev); 1654 1655 /* Support for loadable net-drivers */ 1656 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, 1657 void (*setup)(struct net_device *), 1658 unsigned int queue_count); 1659 #define alloc_netdev(sizeof_priv, name, setup) \ 1660 alloc_netdev_mq(sizeof_priv, name, setup, 1) 1661 extern int register_netdev(struct net_device *dev); 1662 extern void unregister_netdev(struct net_device *dev); 1663 /* Functions used for secondary unicast and multicast support */ 1664 extern void dev_set_rx_mode(struct net_device *dev); 1665 extern void __dev_set_rx_mode(struct net_device *dev); 1666 extern int dev_unicast_delete(struct net_device *dev, void *addr, int alen); 1667 extern int dev_unicast_add(struct net_device *dev, void *addr, int alen); 1668 extern int dev_unicast_sync(struct net_device *to, struct net_device *from); 1669 extern void dev_unicast_unsync(struct net_device *to, struct net_device *from); 1670 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all); 1671 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly); 1672 extern int dev_mc_sync(struct net_device *to, struct net_device *from); 1673 extern void dev_mc_unsync(struct net_device *to, struct net_device *from); 1674 extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all); 1675 extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly); 1676 extern int __dev_addr_sync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count); 1677 extern void __dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count); 1678 extern int dev_set_promiscuity(struct net_device *dev, int inc); 1679 extern int dev_set_allmulti(struct net_device *dev, int inc); 1680 extern void netdev_state_change(struct net_device *dev); 1681 extern void netdev_bonding_change(struct net_device *dev); 1682 extern void netdev_features_change(struct net_device *dev); 1683 /* Load a device via the kmod */ 1684 extern void dev_load(struct net *net, const char *name); 1685 extern void dev_mcast_init(void); 1686 extern int netdev_max_backlog; 1687 extern int weight_p; 1688 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 1689 extern int skb_checksum_help(struct sk_buff *skb); 1690 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features); 1691 #ifdef CONFIG_BUG 1692 extern void netdev_rx_csum_fault(struct net_device *dev); 1693 #else 1694 static inline void netdev_rx_csum_fault(struct net_device *dev) 1695 { 1696 } 1697 #endif 1698 /* rx skb timestamps */ 1699 extern void net_enable_timestamp(void); 1700 extern void net_disable_timestamp(void); 1701 1702 #ifdef CONFIG_PROC_FS 1703 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 1704 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 1705 extern void dev_seq_stop(struct seq_file *seq, void *v); 1706 #endif 1707 1708 extern int netdev_class_create_file(struct class_attribute *class_attr); 1709 extern void netdev_class_remove_file(struct class_attribute *class_attr); 1710 1711 extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len); 1712 1713 extern void linkwatch_run_queue(void); 1714 1715 unsigned long netdev_increment_features(unsigned long all, unsigned long one, 1716 unsigned long mask); 1717 unsigned long netdev_fix_features(unsigned long features, const char *name); 1718 1719 static inline int net_gso_ok(int features, int gso_type) 1720 { 1721 int feature = gso_type << NETIF_F_GSO_SHIFT; 1722 return (features & feature) == feature; 1723 } 1724 1725 static inline int skb_gso_ok(struct sk_buff *skb, int features) 1726 { 1727 return net_gso_ok(features, skb_shinfo(skb)->gso_type); 1728 } 1729 1730 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb) 1731 { 1732 return skb_is_gso(skb) && 1733 (!skb_gso_ok(skb, dev->features) || 1734 unlikely(skb->ip_summed != CHECKSUM_PARTIAL)); 1735 } 1736 1737 static inline void netif_set_gso_max_size(struct net_device *dev, 1738 unsigned int size) 1739 { 1740 dev->gso_max_size = size; 1741 } 1742 1743 /* On bonding slaves other than the currently active slave, suppress 1744 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and 1745 * ARP on active-backup slaves with arp_validate enabled. 1746 */ 1747 static inline int skb_bond_should_drop(struct sk_buff *skb) 1748 { 1749 struct net_device *dev = skb->dev; 1750 struct net_device *master = dev->master; 1751 1752 if (master && 1753 (dev->priv_flags & IFF_SLAVE_INACTIVE)) { 1754 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) && 1755 skb->protocol == __constant_htons(ETH_P_ARP)) 1756 return 0; 1757 1758 if (master->priv_flags & IFF_MASTER_ALB) { 1759 if (skb->pkt_type != PACKET_BROADCAST && 1760 skb->pkt_type != PACKET_MULTICAST) 1761 return 0; 1762 } 1763 if (master->priv_flags & IFF_MASTER_8023AD && 1764 skb->protocol == __constant_htons(ETH_P_SLOW)) 1765 return 0; 1766 1767 return 1; 1768 } 1769 return 0; 1770 } 1771 1772 #endif /* __KERNEL__ */ 1773 1774 #endif /* _LINUX_DEV_H */ 1775