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, <waltje@uWalt.NL.Mugnet.ORG> 12 * Corey Minyard <wf-rch!minyard@relay.EU.net> 13 * Donald J. Becker, <becker@cesdis.gsfc.nasa.gov> 14 * Alan Cox, <alan@lxorguk.ukuu.org.uk> 15 * Bjorn Ekwall. <bj0rn@blox.se> 16 * Pekka Riikonen <priikone@poseidon.pspt.fi> 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 }; 323 324 extern void __napi_schedule(struct napi_struct *n); 325 326 static inline int napi_disable_pending(struct napi_struct *n) 327 { 328 return test_bit(NAPI_STATE_DISABLE, &n->state); 329 } 330 331 /** 332 * napi_schedule_prep - check if napi can be scheduled 333 * @n: napi context 334 * 335 * Test if NAPI routine is already running, and if not mark 336 * it as running. This is used as a condition variable 337 * insure only one NAPI poll instance runs. We also make 338 * sure there is no pending NAPI disable. 339 */ 340 static inline int napi_schedule_prep(struct napi_struct *n) 341 { 342 return !napi_disable_pending(n) && 343 !test_and_set_bit(NAPI_STATE_SCHED, &n->state); 344 } 345 346 /** 347 * napi_schedule - schedule NAPI poll 348 * @n: napi context 349 * 350 * Schedule NAPI poll routine to be called if it is not already 351 * running. 352 */ 353 static inline void napi_schedule(struct napi_struct *n) 354 { 355 if (napi_schedule_prep(n)) 356 __napi_schedule(n); 357 } 358 359 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */ 360 static inline int napi_reschedule(struct napi_struct *napi) 361 { 362 if (napi_schedule_prep(napi)) { 363 __napi_schedule(napi); 364 return 1; 365 } 366 return 0; 367 } 368 369 /** 370 * napi_complete - NAPI processing complete 371 * @n: napi context 372 * 373 * Mark NAPI processing as complete. 374 */ 375 static inline void __napi_complete(struct napi_struct *n) 376 { 377 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); 378 list_del(&n->poll_list); 379 smp_mb__before_clear_bit(); 380 clear_bit(NAPI_STATE_SCHED, &n->state); 381 } 382 383 static inline void napi_complete(struct napi_struct *n) 384 { 385 unsigned long flags; 386 387 local_irq_save(flags); 388 __napi_complete(n); 389 local_irq_restore(flags); 390 } 391 392 /** 393 * napi_disable - prevent NAPI from scheduling 394 * @n: napi context 395 * 396 * Stop NAPI from being scheduled on this context. 397 * Waits till any outstanding processing completes. 398 */ 399 static inline void napi_disable(struct napi_struct *n) 400 { 401 set_bit(NAPI_STATE_DISABLE, &n->state); 402 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state)) 403 msleep(1); 404 clear_bit(NAPI_STATE_DISABLE, &n->state); 405 } 406 407 /** 408 * napi_enable - enable NAPI scheduling 409 * @n: napi context 410 * 411 * Resume NAPI from being scheduled on this context. 412 * Must be paired with napi_disable. 413 */ 414 static inline void napi_enable(struct napi_struct *n) 415 { 416 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); 417 smp_mb__before_clear_bit(); 418 clear_bit(NAPI_STATE_SCHED, &n->state); 419 } 420 421 #ifdef CONFIG_SMP 422 /** 423 * napi_synchronize - wait until NAPI is not running 424 * @n: napi context 425 * 426 * Wait until NAPI is done being scheduled on this context. 427 * Waits till any outstanding processing completes but 428 * does not disable future activations. 429 */ 430 static inline void napi_synchronize(const struct napi_struct *n) 431 { 432 while (test_bit(NAPI_STATE_SCHED, &n->state)) 433 msleep(1); 434 } 435 #else 436 # define napi_synchronize(n) barrier() 437 #endif 438 439 enum netdev_queue_state_t 440 { 441 __QUEUE_STATE_XOFF, 442 __QUEUE_STATE_FROZEN, 443 }; 444 445 struct netdev_queue { 446 struct net_device *dev; 447 struct Qdisc *qdisc; 448 unsigned long state; 449 spinlock_t _xmit_lock; 450 int xmit_lock_owner; 451 struct Qdisc *qdisc_sleeping; 452 } ____cacheline_aligned_in_smp; 453 454 /* 455 * The DEVICE structure. 456 * Actually, this whole structure is a big mistake. It mixes I/O 457 * data with strictly "high-level" data, and it has to know about 458 * almost every data structure used in the INET module. 459 * 460 * FIXME: cleanup struct net_device such that network protocol info 461 * moves out. 462 */ 463 464 struct net_device 465 { 466 467 /* 468 * This is the first field of the "visible" part of this structure 469 * (i.e. as seen by users in the "Space.c" file). It is the name 470 * the interface. 471 */ 472 char name[IFNAMSIZ]; 473 /* device name hash chain */ 474 struct hlist_node name_hlist; 475 /* snmp alias */ 476 char *ifalias; 477 478 /* 479 * I/O specific fields 480 * FIXME: Merge these and struct ifmap into one 481 */ 482 unsigned long mem_end; /* shared mem end */ 483 unsigned long mem_start; /* shared mem start */ 484 unsigned long base_addr; /* device I/O address */ 485 unsigned int irq; /* device IRQ number */ 486 487 /* 488 * Some hardware also needs these fields, but they are not 489 * part of the usual set specified in Space.c. 490 */ 491 492 unsigned char if_port; /* Selectable AUI, TP,..*/ 493 unsigned char dma; /* DMA channel */ 494 495 unsigned long state; 496 497 struct list_head dev_list; 498 #ifdef CONFIG_NETPOLL 499 struct list_head napi_list; 500 #endif 501 502 /* The device initialization function. Called only once. */ 503 int (*init)(struct net_device *dev); 504 505 /* ------- Fields preinitialized in Space.c finish here ------- */ 506 507 /* Net device features */ 508 unsigned long features; 509 #define NETIF_F_SG 1 /* Scatter/gather IO. */ 510 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */ 511 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ 512 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ 513 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */ 514 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ 515 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ 516 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ 517 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ 518 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ 519 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ 520 #define NETIF_F_GSO 2048 /* Enable software GSO. */ 521 #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */ 522 /* do not use LLTX in new drivers */ 523 #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */ 524 #define NETIF_F_LRO 32768 /* large receive offload */ 525 526 /* Segmentation offload features */ 527 #define NETIF_F_GSO_SHIFT 16 528 #define NETIF_F_GSO_MASK 0xffff0000 529 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT) 530 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT) 531 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT) 532 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT) 533 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT) 534 535 /* List of features with software fallbacks. */ 536 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6) 537 538 539 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM) 540 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM) 541 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM) 542 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM) 543 544 /* 545 * If one device supports one of these features, then enable them 546 * for all in netdev_increment_features. 547 */ 548 #define NETIF_F_ONE_FOR_ALL (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \ 549 NETIF_F_SG | NETIF_F_HIGHDMA | \ 550 NETIF_F_FRAGLIST) 551 552 /* Interface index. Unique device identifier */ 553 int ifindex; 554 int iflink; 555 556 557 struct net_device_stats* (*get_stats)(struct net_device *dev); 558 struct net_device_stats stats; 559 560 #ifdef CONFIG_WIRELESS_EXT 561 /* List of functions to handle Wireless Extensions (instead of ioctl). 562 * See <net/iw_handler.h> for details. Jean II */ 563 const struct iw_handler_def * wireless_handlers; 564 /* Instance data managed by the core of Wireless Extensions. */ 565 struct iw_public_data * wireless_data; 566 #endif 567 const struct ethtool_ops *ethtool_ops; 568 569 /* Hardware header description */ 570 const struct header_ops *header_ops; 571 572 /* 573 * This marks the end of the "visible" part of the structure. All 574 * fields hereafter are internal to the system, and may change at 575 * will (read: may be cleaned up at will). 576 */ 577 578 579 unsigned int flags; /* interface flags (a la BSD) */ 580 unsigned short gflags; 581 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ 582 unsigned short padded; /* How much padding added by alloc_netdev() */ 583 584 unsigned char operstate; /* RFC2863 operstate */ 585 unsigned char link_mode; /* mapping policy to operstate */ 586 587 unsigned mtu; /* interface MTU value */ 588 unsigned short type; /* interface hardware type */ 589 unsigned short hard_header_len; /* hardware hdr length */ 590 591 /* extra head- and tailroom the hardware may need, but not in all cases 592 * can this be guaranteed, especially tailroom. Some cases also use 593 * LL_MAX_HEADER instead to allocate the skb. 594 */ 595 unsigned short needed_headroom; 596 unsigned short needed_tailroom; 597 598 struct net_device *master; /* Pointer to master device of a group, 599 * which this device is member of. 600 */ 601 602 /* Interface address info. */ 603 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ 604 unsigned char addr_len; /* hardware address length */ 605 unsigned short dev_id; /* for shared network cards */ 606 607 spinlock_t addr_list_lock; 608 struct dev_addr_list *uc_list; /* Secondary unicast mac addresses */ 609 int uc_count; /* Number of installed ucasts */ 610 int uc_promisc; 611 struct dev_addr_list *mc_list; /* Multicast mac addresses */ 612 int mc_count; /* Number of installed mcasts */ 613 unsigned int promiscuity; 614 unsigned int allmulti; 615 616 617 /* Protocol specific pointers */ 618 619 #ifdef CONFIG_NET_DSA 620 void *dsa_ptr; /* dsa specific data */ 621 #endif 622 void *atalk_ptr; /* AppleTalk link */ 623 void *ip_ptr; /* IPv4 specific data */ 624 void *dn_ptr; /* DECnet specific data */ 625 void *ip6_ptr; /* IPv6 specific data */ 626 void *ec_ptr; /* Econet specific data */ 627 void *ax25_ptr; /* AX.25 specific data */ 628 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data, 629 assign before registering */ 630 631 /* 632 * Cache line mostly used on receive path (including eth_type_trans()) 633 */ 634 unsigned long last_rx; /* Time of last Rx */ 635 /* Interface address info used in eth_type_trans() */ 636 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast 637 because most packets are unicast) */ 638 639 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 640 641 struct netdev_queue rx_queue; 642 643 struct netdev_queue *_tx ____cacheline_aligned_in_smp; 644 645 /* Number of TX queues allocated at alloc_netdev_mq() time */ 646 unsigned int num_tx_queues; 647 648 /* Number of TX queues currently active in device */ 649 unsigned int real_num_tx_queues; 650 651 unsigned long tx_queue_len; /* Max frames per queue allowed */ 652 spinlock_t tx_global_lock; 653 /* 654 * One part is mostly used on xmit path (device) 655 */ 656 void *priv; /* pointer to private data */ 657 int (*hard_start_xmit) (struct sk_buff *skb, 658 struct net_device *dev); 659 /* These may be needed for future network-power-down code. */ 660 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 661 662 int watchdog_timeo; /* used by dev_watchdog() */ 663 struct timer_list watchdog_timer; 664 665 /* 666 * refcnt is a very hot point, so align it on SMP 667 */ 668 /* Number of references to this device */ 669 atomic_t refcnt ____cacheline_aligned_in_smp; 670 671 /* delayed register/unregister */ 672 struct list_head todo_list; 673 /* device index hash chain */ 674 struct hlist_node index_hlist; 675 676 struct net_device *link_watch_next; 677 678 /* register/unregister state machine */ 679 enum { NETREG_UNINITIALIZED=0, 680 NETREG_REGISTERED, /* completed register_netdevice */ 681 NETREG_UNREGISTERING, /* called unregister_netdevice */ 682 NETREG_UNREGISTERED, /* completed unregister todo */ 683 NETREG_RELEASED, /* called free_netdev */ 684 } reg_state; 685 686 /* Called after device is detached from network. */ 687 void (*uninit)(struct net_device *dev); 688 /* Called after last user reference disappears. */ 689 void (*destructor)(struct net_device *dev); 690 691 /* Pointers to interface service routines. */ 692 int (*open)(struct net_device *dev); 693 int (*stop)(struct net_device *dev); 694 #define HAVE_NETDEV_POLL 695 #define HAVE_CHANGE_RX_FLAGS 696 void (*change_rx_flags)(struct net_device *dev, 697 int flags); 698 #define HAVE_SET_RX_MODE 699 void (*set_rx_mode)(struct net_device *dev); 700 #define HAVE_MULTICAST 701 void (*set_multicast_list)(struct net_device *dev); 702 #define HAVE_SET_MAC_ADDR 703 int (*set_mac_address)(struct net_device *dev, 704 void *addr); 705 #define HAVE_VALIDATE_ADDR 706 int (*validate_addr)(struct net_device *dev); 707 #define HAVE_PRIVATE_IOCTL 708 int (*do_ioctl)(struct net_device *dev, 709 struct ifreq *ifr, int cmd); 710 #define HAVE_SET_CONFIG 711 int (*set_config)(struct net_device *dev, 712 struct ifmap *map); 713 #define HAVE_CHANGE_MTU 714 int (*change_mtu)(struct net_device *dev, int new_mtu); 715 716 #define HAVE_TX_TIMEOUT 717 void (*tx_timeout) (struct net_device *dev); 718 719 void (*vlan_rx_register)(struct net_device *dev, 720 struct vlan_group *grp); 721 void (*vlan_rx_add_vid)(struct net_device *dev, 722 unsigned short vid); 723 void (*vlan_rx_kill_vid)(struct net_device *dev, 724 unsigned short vid); 725 726 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *); 727 #ifdef CONFIG_NETPOLL 728 struct netpoll_info *npinfo; 729 #endif 730 #ifdef CONFIG_NET_POLL_CONTROLLER 731 void (*poll_controller)(struct net_device *dev); 732 #endif 733 734 u16 (*select_queue)(struct net_device *dev, 735 struct sk_buff *skb); 736 737 #ifdef CONFIG_NET_NS 738 /* Network namespace this network device is inside */ 739 struct net *nd_net; 740 #endif 741 742 /* mid-layer private */ 743 void *ml_priv; 744 745 /* bridge stuff */ 746 struct net_bridge_port *br_port; 747 /* macvlan */ 748 struct macvlan_port *macvlan_port; 749 /* GARP */ 750 struct garp_port *garp_port; 751 752 /* class/net/name entry */ 753 struct device dev; 754 /* space for optional statistics and wireless sysfs groups */ 755 struct attribute_group *sysfs_groups[3]; 756 757 /* rtnetlink link ops */ 758 const struct rtnl_link_ops *rtnl_link_ops; 759 760 /* VLAN feature mask */ 761 unsigned long vlan_features; 762 763 /* for setting kernel sock attribute on TCP connection setup */ 764 #define GSO_MAX_SIZE 65536 765 unsigned int gso_max_size; 766 }; 767 #define to_net_dev(d) container_of(d, struct net_device, dev) 768 769 #define NETDEV_ALIGN 32 770 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1) 771 772 static inline 773 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev, 774 unsigned int index) 775 { 776 return &dev->_tx[index]; 777 } 778 779 static inline void netdev_for_each_tx_queue(struct net_device *dev, 780 void (*f)(struct net_device *, 781 struct netdev_queue *, 782 void *), 783 void *arg) 784 { 785 unsigned int i; 786 787 for (i = 0; i < dev->num_tx_queues; i++) 788 f(dev, &dev->_tx[i], arg); 789 } 790 791 /* 792 * Net namespace inlines 793 */ 794 static inline 795 struct net *dev_net(const struct net_device *dev) 796 { 797 #ifdef CONFIG_NET_NS 798 return dev->nd_net; 799 #else 800 return &init_net; 801 #endif 802 } 803 804 static inline 805 void dev_net_set(struct net_device *dev, struct net *net) 806 { 807 #ifdef CONFIG_NET_NS 808 release_net(dev->nd_net); 809 dev->nd_net = hold_net(net); 810 #endif 811 } 812 813 static inline bool netdev_uses_dsa_tags(struct net_device *dev) 814 { 815 #ifdef CONFIG_NET_DSA_TAG_DSA 816 if (dev->dsa_ptr != NULL) 817 return dsa_uses_dsa_tags(dev->dsa_ptr); 818 #endif 819 820 return 0; 821 } 822 823 static inline bool netdev_uses_trailer_tags(struct net_device *dev) 824 { 825 #ifdef CONFIG_NET_DSA_TAG_TRAILER 826 if (dev->dsa_ptr != NULL) 827 return dsa_uses_trailer_tags(dev->dsa_ptr); 828 #endif 829 830 return 0; 831 } 832 833 /** 834 * netdev_priv - access network device private data 835 * @dev: network device 836 * 837 * Get network device private data 838 */ 839 static inline void *netdev_priv(const struct net_device *dev) 840 { 841 return (char *)dev + ((sizeof(struct net_device) 842 + NETDEV_ALIGN_CONST) 843 & ~NETDEV_ALIGN_CONST); 844 } 845 846 /* Set the sysfs physical device reference for the network logical device 847 * if set prior to registration will cause a symlink during initialization. 848 */ 849 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) 850 851 /** 852 * netif_napi_add - initialize a napi context 853 * @dev: network device 854 * @napi: napi context 855 * @poll: polling function 856 * @weight: default weight 857 * 858 * netif_napi_add() must be used to initialize a napi context prior to calling 859 * *any* of the other napi related functions. 860 */ 861 static inline void netif_napi_add(struct net_device *dev, 862 struct napi_struct *napi, 863 int (*poll)(struct napi_struct *, int), 864 int weight) 865 { 866 INIT_LIST_HEAD(&napi->poll_list); 867 napi->poll = poll; 868 napi->weight = weight; 869 #ifdef CONFIG_NETPOLL 870 napi->dev = dev; 871 list_add(&napi->dev_list, &dev->napi_list); 872 spin_lock_init(&napi->poll_lock); 873 napi->poll_owner = -1; 874 #endif 875 set_bit(NAPI_STATE_SCHED, &napi->state); 876 } 877 878 /** 879 * netif_napi_del - remove a napi context 880 * @napi: napi context 881 * 882 * netif_napi_del() removes a napi context from the network device napi list 883 */ 884 static inline void netif_napi_del(struct napi_struct *napi) 885 { 886 #ifdef CONFIG_NETPOLL 887 list_del(&napi->dev_list); 888 #endif 889 } 890 891 struct packet_type { 892 __be16 type; /* This is really htons(ether_type). */ 893 struct net_device *dev; /* NULL is wildcarded here */ 894 int (*func) (struct sk_buff *, 895 struct net_device *, 896 struct packet_type *, 897 struct net_device *); 898 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 899 int features); 900 int (*gso_send_check)(struct sk_buff *skb); 901 void *af_packet_priv; 902 struct list_head list; 903 }; 904 905 #include <linux/interrupt.h> 906 #include <linux/notifier.h> 907 908 extern rwlock_t dev_base_lock; /* Device list lock */ 909 910 911 #define for_each_netdev(net, d) \ 912 list_for_each_entry(d, &(net)->dev_base_head, dev_list) 913 #define for_each_netdev_safe(net, d, n) \ 914 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list) 915 #define for_each_netdev_continue(net, d) \ 916 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list) 917 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) 918 919 static inline struct net_device *next_net_device(struct net_device *dev) 920 { 921 struct list_head *lh; 922 struct net *net; 923 924 net = dev_net(dev); 925 lh = dev->dev_list.next; 926 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 927 } 928 929 static inline struct net_device *first_net_device(struct net *net) 930 { 931 return list_empty(&net->dev_base_head) ? NULL : 932 net_device_entry(net->dev_base_head.next); 933 } 934 935 extern int netdev_boot_setup_check(struct net_device *dev); 936 extern unsigned long netdev_boot_base(const char *prefix, int unit); 937 extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr); 938 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type); 939 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type); 940 extern void dev_add_pack(struct packet_type *pt); 941 extern void dev_remove_pack(struct packet_type *pt); 942 extern void __dev_remove_pack(struct packet_type *pt); 943 944 extern struct net_device *dev_get_by_flags(struct net *net, unsigned short flags, 945 unsigned short mask); 946 extern struct net_device *dev_get_by_name(struct net *net, const char *name); 947 extern struct net_device *__dev_get_by_name(struct net *net, const char *name); 948 extern int dev_alloc_name(struct net_device *dev, const char *name); 949 extern int dev_open(struct net_device *dev); 950 extern int dev_close(struct net_device *dev); 951 extern void dev_disable_lro(struct net_device *dev); 952 extern int dev_queue_xmit(struct sk_buff *skb); 953 extern int register_netdevice(struct net_device *dev); 954 extern void unregister_netdevice(struct net_device *dev); 955 extern void free_netdev(struct net_device *dev); 956 extern void synchronize_net(void); 957 extern int register_netdevice_notifier(struct notifier_block *nb); 958 extern int unregister_netdevice_notifier(struct notifier_block *nb); 959 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev); 960 extern struct net_device *dev_get_by_index(struct net *net, int ifindex); 961 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex); 962 extern int dev_restart(struct net_device *dev); 963 #ifdef CONFIG_NETPOLL_TRAP 964 extern int netpoll_trap(void); 965 #endif 966 967 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, 968 unsigned short type, 969 const void *daddr, const void *saddr, 970 unsigned len) 971 { 972 if (!dev->header_ops || !dev->header_ops->create) 973 return 0; 974 975 return dev->header_ops->create(skb, dev, type, daddr, saddr, len); 976 } 977 978 static inline int dev_parse_header(const struct sk_buff *skb, 979 unsigned char *haddr) 980 { 981 const struct net_device *dev = skb->dev; 982 983 if (!dev->header_ops || !dev->header_ops->parse) 984 return 0; 985 return dev->header_ops->parse(skb, haddr); 986 } 987 988 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 989 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 990 static inline int unregister_gifconf(unsigned int family) 991 { 992 return register_gifconf(family, NULL); 993 } 994 995 /* 996 * Incoming packets are placed on per-cpu queues so that 997 * no locking is needed. 998 */ 999 struct softnet_data 1000 { 1001 struct Qdisc *output_queue; 1002 struct sk_buff_head input_pkt_queue; 1003 struct list_head poll_list; 1004 struct sk_buff *completion_queue; 1005 1006 struct napi_struct backlog; 1007 #ifdef CONFIG_NET_DMA 1008 struct dma_chan *net_dma; 1009 #endif 1010 }; 1011 1012 DECLARE_PER_CPU(struct softnet_data,softnet_data); 1013 1014 #define HAVE_NETIF_QUEUE 1015 1016 extern void __netif_schedule(struct Qdisc *q); 1017 1018 static inline void netif_schedule_queue(struct netdev_queue *txq) 1019 { 1020 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state)) 1021 __netif_schedule(txq->qdisc); 1022 } 1023 1024 static inline void netif_tx_schedule_all(struct net_device *dev) 1025 { 1026 unsigned int i; 1027 1028 for (i = 0; i < dev->num_tx_queues; i++) 1029 netif_schedule_queue(netdev_get_tx_queue(dev, i)); 1030 } 1031 1032 static inline void netif_tx_start_queue(struct netdev_queue *dev_queue) 1033 { 1034 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1035 } 1036 1037 /** 1038 * netif_start_queue - allow transmit 1039 * @dev: network device 1040 * 1041 * Allow upper layers to call the device hard_start_xmit routine. 1042 */ 1043 static inline void netif_start_queue(struct net_device *dev) 1044 { 1045 netif_tx_start_queue(netdev_get_tx_queue(dev, 0)); 1046 } 1047 1048 static inline void netif_tx_start_all_queues(struct net_device *dev) 1049 { 1050 unsigned int i; 1051 1052 for (i = 0; i < dev->num_tx_queues; i++) { 1053 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1054 netif_tx_start_queue(txq); 1055 } 1056 } 1057 1058 static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue) 1059 { 1060 #ifdef CONFIG_NETPOLL_TRAP 1061 if (netpoll_trap()) { 1062 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1063 return; 1064 } 1065 #endif 1066 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state)) 1067 __netif_schedule(dev_queue->qdisc); 1068 } 1069 1070 /** 1071 * netif_wake_queue - restart transmit 1072 * @dev: network device 1073 * 1074 * Allow upper layers to call the device hard_start_xmit routine. 1075 * Used for flow control when transmit resources are available. 1076 */ 1077 static inline void netif_wake_queue(struct net_device *dev) 1078 { 1079 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0)); 1080 } 1081 1082 static inline void netif_tx_wake_all_queues(struct net_device *dev) 1083 { 1084 unsigned int i; 1085 1086 for (i = 0; i < dev->num_tx_queues; i++) { 1087 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1088 netif_tx_wake_queue(txq); 1089 } 1090 } 1091 1092 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue) 1093 { 1094 set_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1095 } 1096 1097 /** 1098 * netif_stop_queue - stop transmitted packets 1099 * @dev: network device 1100 * 1101 * Stop upper layers calling the device hard_start_xmit routine. 1102 * Used for flow control when transmit resources are unavailable. 1103 */ 1104 static inline void netif_stop_queue(struct net_device *dev) 1105 { 1106 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0)); 1107 } 1108 1109 static inline void netif_tx_stop_all_queues(struct net_device *dev) 1110 { 1111 unsigned int i; 1112 1113 for (i = 0; i < dev->num_tx_queues; i++) { 1114 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1115 netif_tx_stop_queue(txq); 1116 } 1117 } 1118 1119 static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue) 1120 { 1121 return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1122 } 1123 1124 /** 1125 * netif_queue_stopped - test if transmit queue is flowblocked 1126 * @dev: network device 1127 * 1128 * Test if transmit queue on device is currently unable to send. 1129 */ 1130 static inline int netif_queue_stopped(const struct net_device *dev) 1131 { 1132 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0)); 1133 } 1134 1135 static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue) 1136 { 1137 return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state); 1138 } 1139 1140 /** 1141 * netif_running - test if up 1142 * @dev: network device 1143 * 1144 * Test if the device has been brought up. 1145 */ 1146 static inline int netif_running(const struct net_device *dev) 1147 { 1148 return test_bit(__LINK_STATE_START, &dev->state); 1149 } 1150 1151 /* 1152 * Routines to manage the subqueues on a device. We only need start 1153 * stop, and a check if it's stopped. All other device management is 1154 * done at the overall netdevice level. 1155 * Also test the device if we're multiqueue. 1156 */ 1157 1158 /** 1159 * netif_start_subqueue - allow sending packets on subqueue 1160 * @dev: network device 1161 * @queue_index: sub queue index 1162 * 1163 * Start individual transmit queue of a device with multiple transmit queues. 1164 */ 1165 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 1166 { 1167 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1168 clear_bit(__QUEUE_STATE_XOFF, &txq->state); 1169 } 1170 1171 /** 1172 * netif_stop_subqueue - stop sending packets on subqueue 1173 * @dev: network device 1174 * @queue_index: sub queue index 1175 * 1176 * Stop individual transmit queue of a device with multiple transmit queues. 1177 */ 1178 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 1179 { 1180 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1181 #ifdef CONFIG_NETPOLL_TRAP 1182 if (netpoll_trap()) 1183 return; 1184 #endif 1185 set_bit(__QUEUE_STATE_XOFF, &txq->state); 1186 } 1187 1188 /** 1189 * netif_subqueue_stopped - test status of subqueue 1190 * @dev: network device 1191 * @queue_index: sub queue index 1192 * 1193 * Check individual transmit queue of a device with multiple transmit queues. 1194 */ 1195 static inline int __netif_subqueue_stopped(const struct net_device *dev, 1196 u16 queue_index) 1197 { 1198 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1199 return test_bit(__QUEUE_STATE_XOFF, &txq->state); 1200 } 1201 1202 static inline int netif_subqueue_stopped(const struct net_device *dev, 1203 struct sk_buff *skb) 1204 { 1205 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb)); 1206 } 1207 1208 /** 1209 * netif_wake_subqueue - allow sending packets on subqueue 1210 * @dev: network device 1211 * @queue_index: sub queue index 1212 * 1213 * Resume individual transmit queue of a device with multiple transmit queues. 1214 */ 1215 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 1216 { 1217 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1218 #ifdef CONFIG_NETPOLL_TRAP 1219 if (netpoll_trap()) 1220 return; 1221 #endif 1222 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state)) 1223 __netif_schedule(txq->qdisc); 1224 } 1225 1226 /** 1227 * netif_is_multiqueue - test if device has multiple transmit queues 1228 * @dev: network device 1229 * 1230 * Check if device has multiple transmit queues 1231 */ 1232 static inline int netif_is_multiqueue(const struct net_device *dev) 1233 { 1234 return (dev->num_tx_queues > 1); 1235 } 1236 1237 /* Use this variant when it is known for sure that it 1238 * is executing from hardware interrupt context or with hardware interrupts 1239 * disabled. 1240 */ 1241 extern void dev_kfree_skb_irq(struct sk_buff *skb); 1242 1243 /* Use this variant in places where it could be invoked 1244 * from either hardware interrupt or other context, with hardware interrupts 1245 * either disabled or enabled. 1246 */ 1247 extern void dev_kfree_skb_any(struct sk_buff *skb); 1248 1249 #define HAVE_NETIF_RX 1 1250 extern int netif_rx(struct sk_buff *skb); 1251 extern int netif_rx_ni(struct sk_buff *skb); 1252 #define HAVE_NETIF_RECEIVE_SKB 1 1253 extern int netif_receive_skb(struct sk_buff *skb); 1254 extern void netif_nit_deliver(struct sk_buff *skb); 1255 extern int dev_valid_name(const char *name); 1256 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *); 1257 extern int dev_ethtool(struct net *net, struct ifreq *); 1258 extern unsigned dev_get_flags(const struct net_device *); 1259 extern int dev_change_flags(struct net_device *, unsigned); 1260 extern int dev_change_name(struct net_device *, const char *); 1261 extern int dev_set_alias(struct net_device *, const char *, size_t); 1262 extern int dev_change_net_namespace(struct net_device *, 1263 struct net *, const char *); 1264 extern int dev_set_mtu(struct net_device *, int); 1265 extern int dev_set_mac_address(struct net_device *, 1266 struct sockaddr *); 1267 extern int dev_hard_start_xmit(struct sk_buff *skb, 1268 struct net_device *dev, 1269 struct netdev_queue *txq); 1270 1271 extern int netdev_budget; 1272 1273 /* Called by rtnetlink.c:rtnl_unlock() */ 1274 extern void netdev_run_todo(void); 1275 1276 /** 1277 * dev_put - release reference to device 1278 * @dev: network device 1279 * 1280 * Release reference to device to allow it to be freed. 1281 */ 1282 static inline void dev_put(struct net_device *dev) 1283 { 1284 atomic_dec(&dev->refcnt); 1285 } 1286 1287 /** 1288 * dev_hold - get reference to device 1289 * @dev: network device 1290 * 1291 * Hold reference to device to keep it from being freed. 1292 */ 1293 static inline void dev_hold(struct net_device *dev) 1294 { 1295 atomic_inc(&dev->refcnt); 1296 } 1297 1298 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 1299 * and _off may be called from IRQ context, but it is caller 1300 * who is responsible for serialization of these calls. 1301 * 1302 * The name carrier is inappropriate, these functions should really be 1303 * called netif_lowerlayer_*() because they represent the state of any 1304 * kind of lower layer not just hardware media. 1305 */ 1306 1307 extern void linkwatch_fire_event(struct net_device *dev); 1308 1309 /** 1310 * netif_carrier_ok - test if carrier present 1311 * @dev: network device 1312 * 1313 * Check if carrier is present on device 1314 */ 1315 static inline int netif_carrier_ok(const struct net_device *dev) 1316 { 1317 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 1318 } 1319 1320 extern void __netdev_watchdog_up(struct net_device *dev); 1321 1322 extern void netif_carrier_on(struct net_device *dev); 1323 1324 extern void netif_carrier_off(struct net_device *dev); 1325 1326 /** 1327 * netif_dormant_on - mark device as dormant. 1328 * @dev: network device 1329 * 1330 * Mark device as dormant (as per RFC2863). 1331 * 1332 * The dormant state indicates that the relevant interface is not 1333 * actually in a condition to pass packets (i.e., it is not 'up') but is 1334 * in a "pending" state, waiting for some external event. For "on- 1335 * demand" interfaces, this new state identifies the situation where the 1336 * interface is waiting for events to place it in the up state. 1337 * 1338 */ 1339 static inline void netif_dormant_on(struct net_device *dev) 1340 { 1341 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 1342 linkwatch_fire_event(dev); 1343 } 1344 1345 /** 1346 * netif_dormant_off - set device as not dormant. 1347 * @dev: network device 1348 * 1349 * Device is not in dormant state. 1350 */ 1351 static inline void netif_dormant_off(struct net_device *dev) 1352 { 1353 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 1354 linkwatch_fire_event(dev); 1355 } 1356 1357 /** 1358 * netif_dormant - test if carrier present 1359 * @dev: network device 1360 * 1361 * Check if carrier is present on device 1362 */ 1363 static inline int netif_dormant(const struct net_device *dev) 1364 { 1365 return test_bit(__LINK_STATE_DORMANT, &dev->state); 1366 } 1367 1368 1369 /** 1370 * netif_oper_up - test if device is operational 1371 * @dev: network device 1372 * 1373 * Check if carrier is operational 1374 */ 1375 static inline int netif_oper_up(const struct net_device *dev) { 1376 return (dev->operstate == IF_OPER_UP || 1377 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 1378 } 1379 1380 /** 1381 * netif_device_present - is device available or removed 1382 * @dev: network device 1383 * 1384 * Check if device has not been removed from system. 1385 */ 1386 static inline int netif_device_present(struct net_device *dev) 1387 { 1388 return test_bit(__LINK_STATE_PRESENT, &dev->state); 1389 } 1390 1391 extern void netif_device_detach(struct net_device *dev); 1392 1393 extern void netif_device_attach(struct net_device *dev); 1394 1395 /* 1396 * Network interface message level settings 1397 */ 1398 #define HAVE_NETIF_MSG 1 1399 1400 enum { 1401 NETIF_MSG_DRV = 0x0001, 1402 NETIF_MSG_PROBE = 0x0002, 1403 NETIF_MSG_LINK = 0x0004, 1404 NETIF_MSG_TIMER = 0x0008, 1405 NETIF_MSG_IFDOWN = 0x0010, 1406 NETIF_MSG_IFUP = 0x0020, 1407 NETIF_MSG_RX_ERR = 0x0040, 1408 NETIF_MSG_TX_ERR = 0x0080, 1409 NETIF_MSG_TX_QUEUED = 0x0100, 1410 NETIF_MSG_INTR = 0x0200, 1411 NETIF_MSG_TX_DONE = 0x0400, 1412 NETIF_MSG_RX_STATUS = 0x0800, 1413 NETIF_MSG_PKTDATA = 0x1000, 1414 NETIF_MSG_HW = 0x2000, 1415 NETIF_MSG_WOL = 0x4000, 1416 }; 1417 1418 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 1419 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 1420 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 1421 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 1422 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 1423 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 1424 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 1425 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 1426 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 1427 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 1428 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 1429 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 1430 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 1431 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 1432 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 1433 1434 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 1435 { 1436 /* use default */ 1437 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 1438 return default_msg_enable_bits; 1439 if (debug_value == 0) /* no output */ 1440 return 0; 1441 /* set low N bits */ 1442 return (1 << debug_value) - 1; 1443 } 1444 1445 /* Test if receive needs to be scheduled but only if up */ 1446 static inline int netif_rx_schedule_prep(struct net_device *dev, 1447 struct napi_struct *napi) 1448 { 1449 return napi_schedule_prep(napi); 1450 } 1451 1452 /* Add interface to tail of rx poll list. This assumes that _prep has 1453 * already been called and returned 1. 1454 */ 1455 static inline void __netif_rx_schedule(struct net_device *dev, 1456 struct napi_struct *napi) 1457 { 1458 __napi_schedule(napi); 1459 } 1460 1461 /* Try to reschedule poll. Called by irq handler. */ 1462 1463 static inline void netif_rx_schedule(struct net_device *dev, 1464 struct napi_struct *napi) 1465 { 1466 if (netif_rx_schedule_prep(dev, napi)) 1467 __netif_rx_schedule(dev, napi); 1468 } 1469 1470 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). */ 1471 static inline int netif_rx_reschedule(struct net_device *dev, 1472 struct napi_struct *napi) 1473 { 1474 if (napi_schedule_prep(napi)) { 1475 __netif_rx_schedule(dev, napi); 1476 return 1; 1477 } 1478 return 0; 1479 } 1480 1481 /* same as netif_rx_complete, except that local_irq_save(flags) 1482 * has already been issued 1483 */ 1484 static inline void __netif_rx_complete(struct net_device *dev, 1485 struct napi_struct *napi) 1486 { 1487 __napi_complete(napi); 1488 } 1489 1490 /* Remove interface from poll list: it must be in the poll list 1491 * on current cpu. This primitive is called by dev->poll(), when 1492 * it completes the work. The device cannot be out of poll list at this 1493 * moment, it is BUG(). 1494 */ 1495 static inline void netif_rx_complete(struct net_device *dev, 1496 struct napi_struct *napi) 1497 { 1498 unsigned long flags; 1499 1500 local_irq_save(flags); 1501 __netif_rx_complete(dev, napi); 1502 local_irq_restore(flags); 1503 } 1504 1505 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu) 1506 { 1507 spin_lock(&txq->_xmit_lock); 1508 txq->xmit_lock_owner = cpu; 1509 } 1510 1511 static inline void __netif_tx_lock_bh(struct netdev_queue *txq) 1512 { 1513 spin_lock_bh(&txq->_xmit_lock); 1514 txq->xmit_lock_owner = smp_processor_id(); 1515 } 1516 1517 static inline int __netif_tx_trylock(struct netdev_queue *txq) 1518 { 1519 int ok = spin_trylock(&txq->_xmit_lock); 1520 if (likely(ok)) 1521 txq->xmit_lock_owner = smp_processor_id(); 1522 return ok; 1523 } 1524 1525 static inline void __netif_tx_unlock(struct netdev_queue *txq) 1526 { 1527 txq->xmit_lock_owner = -1; 1528 spin_unlock(&txq->_xmit_lock); 1529 } 1530 1531 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq) 1532 { 1533 txq->xmit_lock_owner = -1; 1534 spin_unlock_bh(&txq->_xmit_lock); 1535 } 1536 1537 /** 1538 * netif_tx_lock - grab network device transmit lock 1539 * @dev: network device 1540 * 1541 * Get network device transmit lock 1542 */ 1543 static inline void netif_tx_lock(struct net_device *dev) 1544 { 1545 unsigned int i; 1546 int cpu; 1547 1548 spin_lock(&dev->tx_global_lock); 1549 cpu = smp_processor_id(); 1550 for (i = 0; i < dev->num_tx_queues; i++) { 1551 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1552 1553 /* We are the only thread of execution doing a 1554 * freeze, but we have to grab the _xmit_lock in 1555 * order to synchronize with threads which are in 1556 * the ->hard_start_xmit() handler and already 1557 * checked the frozen bit. 1558 */ 1559 __netif_tx_lock(txq, cpu); 1560 set_bit(__QUEUE_STATE_FROZEN, &txq->state); 1561 __netif_tx_unlock(txq); 1562 } 1563 } 1564 1565 static inline void netif_tx_lock_bh(struct net_device *dev) 1566 { 1567 local_bh_disable(); 1568 netif_tx_lock(dev); 1569 } 1570 1571 static inline void netif_tx_unlock(struct net_device *dev) 1572 { 1573 unsigned int i; 1574 1575 for (i = 0; i < dev->num_tx_queues; i++) { 1576 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1577 1578 /* No need to grab the _xmit_lock here. If the 1579 * queue is not stopped for another reason, we 1580 * force a schedule. 1581 */ 1582 clear_bit(__QUEUE_STATE_FROZEN, &txq->state); 1583 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state)) 1584 __netif_schedule(txq->qdisc); 1585 } 1586 spin_unlock(&dev->tx_global_lock); 1587 } 1588 1589 static inline void netif_tx_unlock_bh(struct net_device *dev) 1590 { 1591 netif_tx_unlock(dev); 1592 local_bh_enable(); 1593 } 1594 1595 #define HARD_TX_LOCK(dev, txq, cpu) { \ 1596 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1597 __netif_tx_lock(txq, cpu); \ 1598 } \ 1599 } 1600 1601 #define HARD_TX_UNLOCK(dev, txq) { \ 1602 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1603 __netif_tx_unlock(txq); \ 1604 } \ 1605 } 1606 1607 static inline void netif_tx_disable(struct net_device *dev) 1608 { 1609 unsigned int i; 1610 int cpu; 1611 1612 local_bh_disable(); 1613 cpu = smp_processor_id(); 1614 for (i = 0; i < dev->num_tx_queues; i++) { 1615 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1616 1617 __netif_tx_lock(txq, cpu); 1618 netif_tx_stop_queue(txq); 1619 __netif_tx_unlock(txq); 1620 } 1621 local_bh_enable(); 1622 } 1623 1624 static inline void netif_addr_lock(struct net_device *dev) 1625 { 1626 spin_lock(&dev->addr_list_lock); 1627 } 1628 1629 static inline void netif_addr_lock_bh(struct net_device *dev) 1630 { 1631 spin_lock_bh(&dev->addr_list_lock); 1632 } 1633 1634 static inline void netif_addr_unlock(struct net_device *dev) 1635 { 1636 spin_unlock(&dev->addr_list_lock); 1637 } 1638 1639 static inline void netif_addr_unlock_bh(struct net_device *dev) 1640 { 1641 spin_unlock_bh(&dev->addr_list_lock); 1642 } 1643 1644 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 1645 1646 extern void ether_setup(struct net_device *dev); 1647 1648 /* Support for loadable net-drivers */ 1649 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, 1650 void (*setup)(struct net_device *), 1651 unsigned int queue_count); 1652 #define alloc_netdev(sizeof_priv, name, setup) \ 1653 alloc_netdev_mq(sizeof_priv, name, setup, 1) 1654 extern int register_netdev(struct net_device *dev); 1655 extern void unregister_netdev(struct net_device *dev); 1656 /* Functions used for secondary unicast and multicast support */ 1657 extern void dev_set_rx_mode(struct net_device *dev); 1658 extern void __dev_set_rx_mode(struct net_device *dev); 1659 extern int dev_unicast_delete(struct net_device *dev, void *addr, int alen); 1660 extern int dev_unicast_add(struct net_device *dev, void *addr, int alen); 1661 extern int dev_unicast_sync(struct net_device *to, struct net_device *from); 1662 extern void dev_unicast_unsync(struct net_device *to, struct net_device *from); 1663 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all); 1664 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly); 1665 extern int dev_mc_sync(struct net_device *to, struct net_device *from); 1666 extern void dev_mc_unsync(struct net_device *to, struct net_device *from); 1667 extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all); 1668 extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly); 1669 extern int __dev_addr_sync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count); 1670 extern void __dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count); 1671 extern int dev_set_promiscuity(struct net_device *dev, int inc); 1672 extern int dev_set_allmulti(struct net_device *dev, int inc); 1673 extern void netdev_state_change(struct net_device *dev); 1674 extern void netdev_bonding_change(struct net_device *dev); 1675 extern void netdev_features_change(struct net_device *dev); 1676 /* Load a device via the kmod */ 1677 extern void dev_load(struct net *net, const char *name); 1678 extern void dev_mcast_init(void); 1679 extern int netdev_max_backlog; 1680 extern int weight_p; 1681 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 1682 extern int skb_checksum_help(struct sk_buff *skb); 1683 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features); 1684 #ifdef CONFIG_BUG 1685 extern void netdev_rx_csum_fault(struct net_device *dev); 1686 #else 1687 static inline void netdev_rx_csum_fault(struct net_device *dev) 1688 { 1689 } 1690 #endif 1691 /* rx skb timestamps */ 1692 extern void net_enable_timestamp(void); 1693 extern void net_disable_timestamp(void); 1694 1695 #ifdef CONFIG_PROC_FS 1696 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 1697 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 1698 extern void dev_seq_stop(struct seq_file *seq, void *v); 1699 #endif 1700 1701 extern int netdev_class_create_file(struct class_attribute *class_attr); 1702 extern void netdev_class_remove_file(struct class_attribute *class_attr); 1703 1704 extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len); 1705 1706 extern void linkwatch_run_queue(void); 1707 1708 unsigned long netdev_increment_features(unsigned long all, unsigned long one, 1709 unsigned long mask); 1710 unsigned long netdev_fix_features(unsigned long features, const char *name); 1711 1712 static inline int net_gso_ok(int features, int gso_type) 1713 { 1714 int feature = gso_type << NETIF_F_GSO_SHIFT; 1715 return (features & feature) == feature; 1716 } 1717 1718 static inline int skb_gso_ok(struct sk_buff *skb, int features) 1719 { 1720 return net_gso_ok(features, skb_shinfo(skb)->gso_type); 1721 } 1722 1723 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb) 1724 { 1725 return skb_is_gso(skb) && 1726 (!skb_gso_ok(skb, dev->features) || 1727 unlikely(skb->ip_summed != CHECKSUM_PARTIAL)); 1728 } 1729 1730 static inline void netif_set_gso_max_size(struct net_device *dev, 1731 unsigned int size) 1732 { 1733 dev->gso_max_size = size; 1734 } 1735 1736 /* On bonding slaves other than the currently active slave, suppress 1737 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and 1738 * ARP on active-backup slaves with arp_validate enabled. 1739 */ 1740 static inline int skb_bond_should_drop(struct sk_buff *skb) 1741 { 1742 struct net_device *dev = skb->dev; 1743 struct net_device *master = dev->master; 1744 1745 if (master && 1746 (dev->priv_flags & IFF_SLAVE_INACTIVE)) { 1747 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) && 1748 skb->protocol == __constant_htons(ETH_P_ARP)) 1749 return 0; 1750 1751 if (master->priv_flags & IFF_MASTER_ALB) { 1752 if (skb->pkt_type != PACKET_BROADCAST && 1753 skb->pkt_type != PACKET_MULTICAST) 1754 return 0; 1755 } 1756 if (master->priv_flags & IFF_MASTER_8023AD && 1757 skb->protocol == __constant_htons(ETH_P_SLOW)) 1758 return 0; 1759 1760 return 1; 1761 } 1762 return 0; 1763 } 1764 1765 #endif /* __KERNEL__ */ 1766 1767 #endif /* _LINUX_DEV_H */ 1768