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