1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Definitions for the Interfaces handler. 7 * 8 * Version: @(#)dev.h 1.0.10 08/12/93 9 * 10 * Authors: Ross Biro 11 * Fred N. van Kempen, <[email protected]> 12 * Corey Minyard <[email protected]> 13 * Donald J. Becker, <[email protected]> 14 * Alan Cox, <[email protected]> 15 * Bjorn Ekwall. <[email protected]> 16 * Pekka Riikonen <[email protected]> 17 * 18 * This program is free software; you can redistribute it and/or 19 * modify it under the terms of the GNU General Public License 20 * as published by the Free Software Foundation; either version 21 * 2 of the License, or (at your option) any later version. 22 * 23 * Moved to /usr/include/linux for NET3 24 */ 25 #ifndef _LINUX_NETDEVICE_H 26 #define _LINUX_NETDEVICE_H 27 28 #include <linux/if.h> 29 #include <linux/if_ether.h> 30 #include <linux/if_packet.h> 31 32 #ifdef __KERNEL__ 33 #include <linux/timer.h> 34 #include <linux/delay.h> 35 #include <asm/atomic.h> 36 #include <asm/cache.h> 37 #include <asm/byteorder.h> 38 39 #include <linux/device.h> 40 #include <linux/percpu.h> 41 #include <linux/dmaengine.h> 42 #include <linux/workqueue.h> 43 44 #include <net/net_namespace.h> 45 #include <net/dsa.h> 46 47 struct vlan_group; 48 struct ethtool_ops; 49 struct netpoll_info; 50 /* 802.11 specific */ 51 struct wireless_dev; 52 /* source back-compat hooks */ 53 #define SET_ETHTOOL_OPS(netdev,ops) \ 54 ( (netdev)->ethtool_ops = (ops) ) 55 56 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev 57 functions are available. */ 58 #define HAVE_FREE_NETDEV /* free_netdev() */ 59 #define HAVE_NETDEV_PRIV /* netdev_priv() */ 60 61 #define NET_XMIT_SUCCESS 0 62 #define NET_XMIT_DROP 1 /* skb dropped */ 63 #define NET_XMIT_CN 2 /* congestion notification */ 64 #define NET_XMIT_POLICED 3 /* skb is shot by police */ 65 #define NET_XMIT_MASK 0xFFFF /* qdisc flags in net/sch_generic.h */ 66 67 /* Backlog congestion levels */ 68 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */ 69 #define NET_RX_DROP 1 /* packet dropped */ 70 #define NET_RX_CN_LOW 2 /* storm alert, just in case */ 71 #define NET_RX_CN_MOD 3 /* Storm on its way! */ 72 #define NET_RX_CN_HIGH 4 /* The storm is here */ 73 #define NET_RX_BAD 5 /* packet dropped due to kernel error */ 74 75 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It 76 * indicates that the device will soon be dropping packets, or already drops 77 * some packets of the same priority; prompting us to send less aggressively. */ 78 #define net_xmit_eval(e) ((e) == NET_XMIT_CN? 0 : (e)) 79 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0) 80 81 #endif 82 83 #define MAX_ADDR_LEN 32 /* Largest hardware address length */ 84 85 /* Driver transmit return codes */ 86 #define NETDEV_TX_OK 0 /* driver took care of packet */ 87 #define NETDEV_TX_BUSY 1 /* driver tx path was busy*/ 88 #define NETDEV_TX_LOCKED -1 /* driver tx lock was already taken */ 89 90 #ifdef __KERNEL__ 91 92 /* 93 * Compute the worst case header length according to the protocols 94 * used. 95 */ 96 97 #if defined(CONFIG_WLAN_80211) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 98 # if defined(CONFIG_MAC80211_MESH) 99 # define LL_MAX_HEADER 128 100 # else 101 # define LL_MAX_HEADER 96 102 # endif 103 #elif defined(CONFIG_TR) 104 # define LL_MAX_HEADER 48 105 #else 106 # define LL_MAX_HEADER 32 107 #endif 108 109 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \ 110 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \ 111 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \ 112 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE) 113 #define MAX_HEADER LL_MAX_HEADER 114 #else 115 #define MAX_HEADER (LL_MAX_HEADER + 48) 116 #endif 117 118 #endif /* __KERNEL__ */ 119 120 /* 121 * Network device statistics. Akin to the 2.0 ether stats but 122 * with byte counters. 123 */ 124 125 struct net_device_stats 126 { 127 unsigned long rx_packets; /* total packets received */ 128 unsigned long tx_packets; /* total packets transmitted */ 129 unsigned long rx_bytes; /* total bytes received */ 130 unsigned long tx_bytes; /* total bytes transmitted */ 131 unsigned long rx_errors; /* bad packets received */ 132 unsigned long tx_errors; /* packet transmit problems */ 133 unsigned long rx_dropped; /* no space in linux buffers */ 134 unsigned long tx_dropped; /* no space available in linux */ 135 unsigned long multicast; /* multicast packets received */ 136 unsigned long collisions; 137 138 /* detailed rx_errors: */ 139 unsigned long rx_length_errors; 140 unsigned long rx_over_errors; /* receiver ring buff overflow */ 141 unsigned long rx_crc_errors; /* recved pkt with crc error */ 142 unsigned long rx_frame_errors; /* recv'd frame alignment error */ 143 unsigned long rx_fifo_errors; /* recv'r fifo overrun */ 144 unsigned long rx_missed_errors; /* receiver missed packet */ 145 146 /* detailed tx_errors */ 147 unsigned long tx_aborted_errors; 148 unsigned long tx_carrier_errors; 149 unsigned long tx_fifo_errors; 150 unsigned long tx_heartbeat_errors; 151 unsigned long tx_window_errors; 152 153 /* for cslip etc */ 154 unsigned long rx_compressed; 155 unsigned long tx_compressed; 156 }; 157 158 159 /* Media selection options. */ 160 enum { 161 IF_PORT_UNKNOWN = 0, 162 IF_PORT_10BASE2, 163 IF_PORT_10BASET, 164 IF_PORT_AUI, 165 IF_PORT_100BASET, 166 IF_PORT_100BASETX, 167 IF_PORT_100BASEFX 168 }; 169 170 #ifdef __KERNEL__ 171 172 #include <linux/cache.h> 173 #include <linux/skbuff.h> 174 175 struct neighbour; 176 struct neigh_parms; 177 struct sk_buff; 178 179 struct netif_rx_stats 180 { 181 unsigned total; 182 unsigned dropped; 183 unsigned time_squeeze; 184 unsigned cpu_collision; 185 }; 186 187 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat); 188 189 struct dev_addr_list 190 { 191 struct dev_addr_list *next; 192 u8 da_addr[MAX_ADDR_LEN]; 193 u8 da_addrlen; 194 u8 da_synced; 195 int da_users; 196 int da_gusers; 197 }; 198 199 /* 200 * We tag multicasts with these structures. 201 */ 202 203 #define dev_mc_list dev_addr_list 204 #define dmi_addr da_addr 205 #define dmi_addrlen da_addrlen 206 #define dmi_users da_users 207 #define dmi_gusers da_gusers 208 209 struct hh_cache 210 { 211 struct hh_cache *hh_next; /* Next entry */ 212 atomic_t hh_refcnt; /* number of users */ 213 /* 214 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate 215 * cache line on SMP. 216 * They are mostly read, but hh_refcnt may be changed quite frequently, 217 * incurring cache line ping pongs. 218 */ 219 __be16 hh_type ____cacheline_aligned_in_smp; 220 /* protocol identifier, f.e ETH_P_IP 221 * NOTE: For VLANs, this will be the 222 * encapuslated type. --BLG 223 */ 224 u16 hh_len; /* length of header */ 225 int (*hh_output)(struct sk_buff *skb); 226 seqlock_t hh_lock; 227 228 /* cached hardware header; allow for machine alignment needs. */ 229 #define HH_DATA_MOD 16 230 #define HH_DATA_OFF(__len) \ 231 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) 232 #define HH_DATA_ALIGN(__len) \ 233 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) 234 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; 235 }; 236 237 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much. 238 * Alternative is: 239 * dev->hard_header_len ? (dev->hard_header_len + 240 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 241 * 242 * We could use other alignment values, but we must maintain the 243 * relationship HH alignment <= LL alignment. 244 * 245 * LL_ALLOCATED_SPACE also takes into account the tailroom the device 246 * may need. 247 */ 248 #define LL_RESERVED_SPACE(dev) \ 249 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 250 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 251 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 252 #define LL_ALLOCATED_SPACE(dev) \ 253 ((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 254 255 struct header_ops { 256 int (*create) (struct sk_buff *skb, struct net_device *dev, 257 unsigned short type, const void *daddr, 258 const void *saddr, unsigned len); 259 int (*parse)(const struct sk_buff *skb, unsigned char *haddr); 260 int (*rebuild)(struct sk_buff *skb); 261 #define HAVE_HEADER_CACHE 262 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh); 263 void (*cache_update)(struct hh_cache *hh, 264 const struct net_device *dev, 265 const unsigned char *haddr); 266 }; 267 268 /* These flag bits are private to the generic network queueing 269 * layer, they may not be explicitly referenced by any other 270 * code. 271 */ 272 273 enum netdev_state_t 274 { 275 __LINK_STATE_START, 276 __LINK_STATE_PRESENT, 277 __LINK_STATE_NOCARRIER, 278 __LINK_STATE_LINKWATCH_PENDING, 279 __LINK_STATE_DORMANT, 280 }; 281 282 283 /* 284 * This structure holds at boot time configured netdevice settings. They 285 * are then used in the device probing. 286 */ 287 struct netdev_boot_setup { 288 char name[IFNAMSIZ]; 289 struct ifmap map; 290 }; 291 #define NETDEV_BOOT_SETUP_MAX 8 292 293 extern int __init netdev_boot_setup(char *str); 294 295 /* 296 * Structure for NAPI scheduling similar to tasklet but with weighting 297 */ 298 struct napi_struct { 299 /* The poll_list must only be managed by the entity which 300 * changes the state of the NAPI_STATE_SCHED bit. This means 301 * whoever atomically sets that bit can add this napi_struct 302 * to the per-cpu poll_list, and whoever clears that bit 303 * can remove from the list right before clearing the bit. 304 */ 305 struct list_head poll_list; 306 307 unsigned long state; 308 int weight; 309 int (*poll)(struct napi_struct *, int); 310 #ifdef CONFIG_NETPOLL 311 spinlock_t poll_lock; 312 int poll_owner; 313 struct net_device *dev; 314 struct list_head dev_list; 315 #endif 316 }; 317 318 enum 319 { 320 NAPI_STATE_SCHED, /* Poll is scheduled */ 321 NAPI_STATE_DISABLE, /* Disable pending */ 322 }; 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 /* Interface index. Unique device identifier */ 545 int ifindex; 546 int iflink; 547 548 549 struct net_device_stats* (*get_stats)(struct net_device *dev); 550 struct net_device_stats stats; 551 552 #ifdef CONFIG_WIRELESS_EXT 553 /* List of functions to handle Wireless Extensions (instead of ioctl). 554 * See <net/iw_handler.h> for details. Jean II */ 555 const struct iw_handler_def * wireless_handlers; 556 /* Instance data managed by the core of Wireless Extensions. */ 557 struct iw_public_data * wireless_data; 558 #endif 559 const struct ethtool_ops *ethtool_ops; 560 561 /* Hardware header description */ 562 const struct header_ops *header_ops; 563 564 /* 565 * This marks the end of the "visible" part of the structure. All 566 * fields hereafter are internal to the system, and may change at 567 * will (read: may be cleaned up at will). 568 */ 569 570 571 unsigned int flags; /* interface flags (a la BSD) */ 572 unsigned short gflags; 573 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ 574 unsigned short padded; /* How much padding added by alloc_netdev() */ 575 576 unsigned char operstate; /* RFC2863 operstate */ 577 unsigned char link_mode; /* mapping policy to operstate */ 578 579 unsigned mtu; /* interface MTU value */ 580 unsigned short type; /* interface hardware type */ 581 unsigned short hard_header_len; /* hardware hdr length */ 582 583 /* extra head- and tailroom the hardware may need, but not in all cases 584 * can this be guaranteed, especially tailroom. Some cases also use 585 * LL_MAX_HEADER instead to allocate the skb. 586 */ 587 unsigned short needed_headroom; 588 unsigned short needed_tailroom; 589 590 struct net_device *master; /* Pointer to master device of a group, 591 * which this device is member of. 592 */ 593 594 /* Interface address info. */ 595 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ 596 unsigned char addr_len; /* hardware address length */ 597 unsigned short dev_id; /* for shared network cards */ 598 599 spinlock_t addr_list_lock; 600 struct dev_addr_list *uc_list; /* Secondary unicast mac addresses */ 601 int uc_count; /* Number of installed ucasts */ 602 int uc_promisc; 603 struct dev_addr_list *mc_list; /* Multicast mac addresses */ 604 int mc_count; /* Number of installed mcasts */ 605 unsigned int promiscuity; 606 unsigned int allmulti; 607 608 609 /* Protocol specific pointers */ 610 611 #ifdef CONFIG_NET_DSA 612 void *dsa_ptr; /* dsa specific data */ 613 #endif 614 void *atalk_ptr; /* AppleTalk link */ 615 void *ip_ptr; /* IPv4 specific data */ 616 void *dn_ptr; /* DECnet specific data */ 617 void *ip6_ptr; /* IPv6 specific data */ 618 void *ec_ptr; /* Econet specific data */ 619 void *ax25_ptr; /* AX.25 specific data */ 620 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data, 621 assign before registering */ 622 623 /* 624 * Cache line mostly used on receive path (including eth_type_trans()) 625 */ 626 unsigned long last_rx; /* Time of last Rx */ 627 /* Interface address info used in eth_type_trans() */ 628 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast 629 because most packets are unicast) */ 630 631 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 632 633 struct netdev_queue rx_queue; 634 635 struct netdev_queue *_tx ____cacheline_aligned_in_smp; 636 637 /* Number of TX queues allocated at alloc_netdev_mq() time */ 638 unsigned int num_tx_queues; 639 640 /* Number of TX queues currently active in device */ 641 unsigned int real_num_tx_queues; 642 643 unsigned long tx_queue_len; /* Max frames per queue allowed */ 644 spinlock_t tx_global_lock; 645 /* 646 * One part is mostly used on xmit path (device) 647 */ 648 void *priv; /* pointer to private data */ 649 int (*hard_start_xmit) (struct sk_buff *skb, 650 struct net_device *dev); 651 /* These may be needed for future network-power-down code. */ 652 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 653 654 int watchdog_timeo; /* used by dev_watchdog() */ 655 struct timer_list watchdog_timer; 656 657 /* 658 * refcnt is a very hot point, so align it on SMP 659 */ 660 /* Number of references to this device */ 661 atomic_t refcnt ____cacheline_aligned_in_smp; 662 663 /* delayed register/unregister */ 664 struct list_head todo_list; 665 /* device index hash chain */ 666 struct hlist_node index_hlist; 667 668 struct net_device *link_watch_next; 669 670 /* register/unregister state machine */ 671 enum { NETREG_UNINITIALIZED=0, 672 NETREG_REGISTERED, /* completed register_netdevice */ 673 NETREG_UNREGISTERING, /* called unregister_netdevice */ 674 NETREG_UNREGISTERED, /* completed unregister todo */ 675 NETREG_RELEASED, /* called free_netdev */ 676 } reg_state; 677 678 /* Called after device is detached from network. */ 679 void (*uninit)(struct net_device *dev); 680 /* Called after last user reference disappears. */ 681 void (*destructor)(struct net_device *dev); 682 683 /* Pointers to interface service routines. */ 684 int (*open)(struct net_device *dev); 685 int (*stop)(struct net_device *dev); 686 #define HAVE_NETDEV_POLL 687 #define HAVE_CHANGE_RX_FLAGS 688 void (*change_rx_flags)(struct net_device *dev, 689 int flags); 690 #define HAVE_SET_RX_MODE 691 void (*set_rx_mode)(struct net_device *dev); 692 #define HAVE_MULTICAST 693 void (*set_multicast_list)(struct net_device *dev); 694 #define HAVE_SET_MAC_ADDR 695 int (*set_mac_address)(struct net_device *dev, 696 void *addr); 697 #define HAVE_VALIDATE_ADDR 698 int (*validate_addr)(struct net_device *dev); 699 #define HAVE_PRIVATE_IOCTL 700 int (*do_ioctl)(struct net_device *dev, 701 struct ifreq *ifr, int cmd); 702 #define HAVE_SET_CONFIG 703 int (*set_config)(struct net_device *dev, 704 struct ifmap *map); 705 #define HAVE_CHANGE_MTU 706 int (*change_mtu)(struct net_device *dev, int new_mtu); 707 708 #define HAVE_TX_TIMEOUT 709 void (*tx_timeout) (struct net_device *dev); 710 711 void (*vlan_rx_register)(struct net_device *dev, 712 struct vlan_group *grp); 713 void (*vlan_rx_add_vid)(struct net_device *dev, 714 unsigned short vid); 715 void (*vlan_rx_kill_vid)(struct net_device *dev, 716 unsigned short vid); 717 718 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *); 719 #ifdef CONFIG_NETPOLL 720 struct netpoll_info *npinfo; 721 #endif 722 #ifdef CONFIG_NET_POLL_CONTROLLER 723 void (*poll_controller)(struct net_device *dev); 724 #endif 725 726 u16 (*select_queue)(struct net_device *dev, 727 struct sk_buff *skb); 728 729 #ifdef CONFIG_NET_NS 730 /* Network namespace this network device is inside */ 731 struct net *nd_net; 732 #endif 733 734 /* mid-layer private */ 735 void *ml_priv; 736 737 /* bridge stuff */ 738 struct net_bridge_port *br_port; 739 /* macvlan */ 740 struct macvlan_port *macvlan_port; 741 /* GARP */ 742 struct garp_port *garp_port; 743 744 /* class/net/name entry */ 745 struct device dev; 746 /* space for optional statistics and wireless sysfs groups */ 747 struct attribute_group *sysfs_groups[3]; 748 749 /* rtnetlink link ops */ 750 const struct rtnl_link_ops *rtnl_link_ops; 751 752 /* VLAN feature mask */ 753 unsigned long vlan_features; 754 755 /* for setting kernel sock attribute on TCP connection setup */ 756 #define GSO_MAX_SIZE 65536 757 unsigned int gso_max_size; 758 }; 759 #define to_net_dev(d) container_of(d, struct net_device, dev) 760 761 #define NETDEV_ALIGN 32 762 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1) 763 764 static inline 765 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev, 766 unsigned int index) 767 { 768 return &dev->_tx[index]; 769 } 770 771 static inline void netdev_for_each_tx_queue(struct net_device *dev, 772 void (*f)(struct net_device *, 773 struct netdev_queue *, 774 void *), 775 void *arg) 776 { 777 unsigned int i; 778 779 for (i = 0; i < dev->num_tx_queues; i++) 780 f(dev, &dev->_tx[i], arg); 781 } 782 783 /* 784 * Net namespace inlines 785 */ 786 static inline 787 struct net *dev_net(const struct net_device *dev) 788 { 789 #ifdef CONFIG_NET_NS 790 return dev->nd_net; 791 #else 792 return &init_net; 793 #endif 794 } 795 796 static inline 797 void dev_net_set(struct net_device *dev, struct net *net) 798 { 799 #ifdef CONFIG_NET_NS 800 release_net(dev->nd_net); 801 dev->nd_net = hold_net(net); 802 #endif 803 } 804 805 static inline bool netdev_uses_dsa_tags(struct net_device *dev) 806 { 807 #ifdef CONFIG_NET_DSA_TAG_DSA 808 if (dev->dsa_ptr != NULL) 809 return dsa_uses_dsa_tags(dev->dsa_ptr); 810 #endif 811 812 return 0; 813 } 814 815 static inline bool netdev_uses_trailer_tags(struct net_device *dev) 816 { 817 #ifdef CONFIG_NET_DSA_TAG_TRAILER 818 if (dev->dsa_ptr != NULL) 819 return dsa_uses_trailer_tags(dev->dsa_ptr); 820 #endif 821 822 return 0; 823 } 824 825 /** 826 * netdev_priv - access network device private data 827 * @dev: network device 828 * 829 * Get network device private data 830 */ 831 static inline void *netdev_priv(const struct net_device *dev) 832 { 833 return (char *)dev + ((sizeof(struct net_device) 834 + NETDEV_ALIGN_CONST) 835 & ~NETDEV_ALIGN_CONST); 836 } 837 838 /* Set the sysfs physical device reference for the network logical device 839 * if set prior to registration will cause a symlink during initialization. 840 */ 841 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) 842 843 /** 844 * netif_napi_add - initialize a napi context 845 * @dev: network device 846 * @napi: napi context 847 * @poll: polling function 848 * @weight: default weight 849 * 850 * netif_napi_add() must be used to initialize a napi context prior to calling 851 * *any* of the other napi related functions. 852 */ 853 static inline void netif_napi_add(struct net_device *dev, 854 struct napi_struct *napi, 855 int (*poll)(struct napi_struct *, int), 856 int weight) 857 { 858 INIT_LIST_HEAD(&napi->poll_list); 859 napi->poll = poll; 860 napi->weight = weight; 861 #ifdef CONFIG_NETPOLL 862 napi->dev = dev; 863 list_add(&napi->dev_list, &dev->napi_list); 864 spin_lock_init(&napi->poll_lock); 865 napi->poll_owner = -1; 866 #endif 867 set_bit(NAPI_STATE_SCHED, &napi->state); 868 } 869 870 /** 871 * netif_napi_del - remove a napi context 872 * @napi: napi context 873 * 874 * netif_napi_del() removes a napi context from the network device napi list 875 */ 876 static inline void netif_napi_del(struct napi_struct *napi) 877 { 878 #ifdef CONFIG_NETPOLL 879 list_del(&napi->dev_list); 880 #endif 881 } 882 883 struct packet_type { 884 __be16 type; /* This is really htons(ether_type). */ 885 struct net_device *dev; /* NULL is wildcarded here */ 886 int (*func) (struct sk_buff *, 887 struct net_device *, 888 struct packet_type *, 889 struct net_device *); 890 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 891 int features); 892 int (*gso_send_check)(struct sk_buff *skb); 893 void *af_packet_priv; 894 struct list_head list; 895 }; 896 897 #include <linux/interrupt.h> 898 #include <linux/notifier.h> 899 900 extern rwlock_t dev_base_lock; /* Device list lock */ 901 902 903 #define for_each_netdev(net, d) \ 904 list_for_each_entry(d, &(net)->dev_base_head, dev_list) 905 #define for_each_netdev_safe(net, d, n) \ 906 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list) 907 #define for_each_netdev_continue(net, d) \ 908 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list) 909 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) 910 911 static inline struct net_device *next_net_device(struct net_device *dev) 912 { 913 struct list_head *lh; 914 struct net *net; 915 916 net = dev_net(dev); 917 lh = dev->dev_list.next; 918 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 919 } 920 921 static inline struct net_device *first_net_device(struct net *net) 922 { 923 return list_empty(&net->dev_base_head) ? NULL : 924 net_device_entry(net->dev_base_head.next); 925 } 926 927 extern int netdev_boot_setup_check(struct net_device *dev); 928 extern unsigned long netdev_boot_base(const char *prefix, int unit); 929 extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr); 930 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type); 931 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type); 932 extern void dev_add_pack(struct packet_type *pt); 933 extern void dev_remove_pack(struct packet_type *pt); 934 extern void __dev_remove_pack(struct packet_type *pt); 935 936 extern struct net_device *dev_get_by_flags(struct net *net, unsigned short flags, 937 unsigned short mask); 938 extern struct net_device *dev_get_by_name(struct net *net, const char *name); 939 extern struct net_device *__dev_get_by_name(struct net *net, const char *name); 940 extern int dev_alloc_name(struct net_device *dev, const char *name); 941 extern int dev_open(struct net_device *dev); 942 extern int dev_close(struct net_device *dev); 943 extern void dev_disable_lro(struct net_device *dev); 944 extern int dev_queue_xmit(struct sk_buff *skb); 945 extern int register_netdevice(struct net_device *dev); 946 extern void unregister_netdevice(struct net_device *dev); 947 extern void free_netdev(struct net_device *dev); 948 extern void synchronize_net(void); 949 extern int register_netdevice_notifier(struct notifier_block *nb); 950 extern int unregister_netdevice_notifier(struct notifier_block *nb); 951 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev); 952 extern struct net_device *dev_get_by_index(struct net *net, int ifindex); 953 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex); 954 extern int dev_restart(struct net_device *dev); 955 #ifdef CONFIG_NETPOLL_TRAP 956 extern int netpoll_trap(void); 957 #endif 958 959 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, 960 unsigned short type, 961 const void *daddr, const void *saddr, 962 unsigned len) 963 { 964 if (!dev->header_ops || !dev->header_ops->create) 965 return 0; 966 967 return dev->header_ops->create(skb, dev, type, daddr, saddr, len); 968 } 969 970 static inline int dev_parse_header(const struct sk_buff *skb, 971 unsigned char *haddr) 972 { 973 const struct net_device *dev = skb->dev; 974 975 if (!dev->header_ops || !dev->header_ops->parse) 976 return 0; 977 return dev->header_ops->parse(skb, haddr); 978 } 979 980 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 981 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 982 static inline int unregister_gifconf(unsigned int family) 983 { 984 return register_gifconf(family, NULL); 985 } 986 987 /* 988 * Incoming packets are placed on per-cpu queues so that 989 * no locking is needed. 990 */ 991 struct softnet_data 992 { 993 struct Qdisc *output_queue; 994 struct sk_buff_head input_pkt_queue; 995 struct list_head poll_list; 996 struct sk_buff *completion_queue; 997 998 struct napi_struct backlog; 999 #ifdef CONFIG_NET_DMA 1000 struct dma_chan *net_dma; 1001 #endif 1002 }; 1003 1004 DECLARE_PER_CPU(struct softnet_data,softnet_data); 1005 1006 #define HAVE_NETIF_QUEUE 1007 1008 extern void __netif_schedule(struct Qdisc *q); 1009 1010 static inline void netif_schedule_queue(struct netdev_queue *txq) 1011 { 1012 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state)) 1013 __netif_schedule(txq->qdisc); 1014 } 1015 1016 static inline void netif_tx_schedule_all(struct net_device *dev) 1017 { 1018 unsigned int i; 1019 1020 for (i = 0; i < dev->num_tx_queues; i++) 1021 netif_schedule_queue(netdev_get_tx_queue(dev, i)); 1022 } 1023 1024 static inline void netif_tx_start_queue(struct netdev_queue *dev_queue) 1025 { 1026 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1027 } 1028 1029 /** 1030 * netif_start_queue - allow transmit 1031 * @dev: network device 1032 * 1033 * Allow upper layers to call the device hard_start_xmit routine. 1034 */ 1035 static inline void netif_start_queue(struct net_device *dev) 1036 { 1037 netif_tx_start_queue(netdev_get_tx_queue(dev, 0)); 1038 } 1039 1040 static inline void netif_tx_start_all_queues(struct net_device *dev) 1041 { 1042 unsigned int i; 1043 1044 for (i = 0; i < dev->num_tx_queues; i++) { 1045 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1046 netif_tx_start_queue(txq); 1047 } 1048 } 1049 1050 static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue) 1051 { 1052 #ifdef CONFIG_NETPOLL_TRAP 1053 if (netpoll_trap()) { 1054 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1055 return; 1056 } 1057 #endif 1058 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state)) 1059 __netif_schedule(dev_queue->qdisc); 1060 } 1061 1062 /** 1063 * netif_wake_queue - restart transmit 1064 * @dev: network device 1065 * 1066 * Allow upper layers to call the device hard_start_xmit routine. 1067 * Used for flow control when transmit resources are available. 1068 */ 1069 static inline void netif_wake_queue(struct net_device *dev) 1070 { 1071 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0)); 1072 } 1073 1074 static inline void netif_tx_wake_all_queues(struct net_device *dev) 1075 { 1076 unsigned int i; 1077 1078 for (i = 0; i < dev->num_tx_queues; i++) { 1079 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1080 netif_tx_wake_queue(txq); 1081 } 1082 } 1083 1084 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue) 1085 { 1086 set_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1087 } 1088 1089 /** 1090 * netif_stop_queue - stop transmitted packets 1091 * @dev: network device 1092 * 1093 * Stop upper layers calling the device hard_start_xmit routine. 1094 * Used for flow control when transmit resources are unavailable. 1095 */ 1096 static inline void netif_stop_queue(struct net_device *dev) 1097 { 1098 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0)); 1099 } 1100 1101 static inline void netif_tx_stop_all_queues(struct net_device *dev) 1102 { 1103 unsigned int i; 1104 1105 for (i = 0; i < dev->num_tx_queues; i++) { 1106 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1107 netif_tx_stop_queue(txq); 1108 } 1109 } 1110 1111 static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue) 1112 { 1113 return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1114 } 1115 1116 /** 1117 * netif_queue_stopped - test if transmit queue is flowblocked 1118 * @dev: network device 1119 * 1120 * Test if transmit queue on device is currently unable to send. 1121 */ 1122 static inline int netif_queue_stopped(const struct net_device *dev) 1123 { 1124 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0)); 1125 } 1126 1127 static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue) 1128 { 1129 return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state); 1130 } 1131 1132 /** 1133 * netif_running - test if up 1134 * @dev: network device 1135 * 1136 * Test if the device has been brought up. 1137 */ 1138 static inline int netif_running(const struct net_device *dev) 1139 { 1140 return test_bit(__LINK_STATE_START, &dev->state); 1141 } 1142 1143 /* 1144 * Routines to manage the subqueues on a device. We only need start 1145 * stop, and a check if it's stopped. All other device management is 1146 * done at the overall netdevice level. 1147 * Also test the device if we're multiqueue. 1148 */ 1149 1150 /** 1151 * netif_start_subqueue - allow sending packets on subqueue 1152 * @dev: network device 1153 * @queue_index: sub queue index 1154 * 1155 * Start individual transmit queue of a device with multiple transmit queues. 1156 */ 1157 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 1158 { 1159 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1160 clear_bit(__QUEUE_STATE_XOFF, &txq->state); 1161 } 1162 1163 /** 1164 * netif_stop_subqueue - stop sending packets on subqueue 1165 * @dev: network device 1166 * @queue_index: sub queue index 1167 * 1168 * Stop individual transmit queue of a device with multiple transmit queues. 1169 */ 1170 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 1171 { 1172 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1173 #ifdef CONFIG_NETPOLL_TRAP 1174 if (netpoll_trap()) 1175 return; 1176 #endif 1177 set_bit(__QUEUE_STATE_XOFF, &txq->state); 1178 } 1179 1180 /** 1181 * netif_subqueue_stopped - test status of subqueue 1182 * @dev: network device 1183 * @queue_index: sub queue index 1184 * 1185 * Check individual transmit queue of a device with multiple transmit queues. 1186 */ 1187 static inline int __netif_subqueue_stopped(const struct net_device *dev, 1188 u16 queue_index) 1189 { 1190 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1191 return test_bit(__QUEUE_STATE_XOFF, &txq->state); 1192 } 1193 1194 static inline int netif_subqueue_stopped(const struct net_device *dev, 1195 struct sk_buff *skb) 1196 { 1197 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb)); 1198 } 1199 1200 /** 1201 * netif_wake_subqueue - allow sending packets on subqueue 1202 * @dev: network device 1203 * @queue_index: sub queue index 1204 * 1205 * Resume individual transmit queue of a device with multiple transmit queues. 1206 */ 1207 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 1208 { 1209 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1210 #ifdef CONFIG_NETPOLL_TRAP 1211 if (netpoll_trap()) 1212 return; 1213 #endif 1214 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state)) 1215 __netif_schedule(txq->qdisc); 1216 } 1217 1218 /** 1219 * netif_is_multiqueue - test if device has multiple transmit queues 1220 * @dev: network device 1221 * 1222 * Check if device has multiple transmit queues 1223 */ 1224 static inline int netif_is_multiqueue(const struct net_device *dev) 1225 { 1226 return (dev->num_tx_queues > 1); 1227 } 1228 1229 /* Use this variant when it is known for sure that it 1230 * is executing from hardware interrupt context or with hardware interrupts 1231 * disabled. 1232 */ 1233 extern void dev_kfree_skb_irq(struct sk_buff *skb); 1234 1235 /* Use this variant in places where it could be invoked 1236 * from either hardware interrupt or other context, with hardware interrupts 1237 * either disabled or enabled. 1238 */ 1239 extern void dev_kfree_skb_any(struct sk_buff *skb); 1240 1241 #define HAVE_NETIF_RX 1 1242 extern int netif_rx(struct sk_buff *skb); 1243 extern int netif_rx_ni(struct sk_buff *skb); 1244 #define HAVE_NETIF_RECEIVE_SKB 1 1245 extern int netif_receive_skb(struct sk_buff *skb); 1246 extern void netif_nit_deliver(struct sk_buff *skb); 1247 extern int dev_valid_name(const char *name); 1248 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *); 1249 extern int dev_ethtool(struct net *net, struct ifreq *); 1250 extern unsigned dev_get_flags(const struct net_device *); 1251 extern int dev_change_flags(struct net_device *, unsigned); 1252 extern int dev_change_name(struct net_device *, const char *); 1253 extern int dev_set_alias(struct net_device *, const char *, size_t); 1254 extern int dev_change_net_namespace(struct net_device *, 1255 struct net *, const char *); 1256 extern int dev_set_mtu(struct net_device *, int); 1257 extern int dev_set_mac_address(struct net_device *, 1258 struct sockaddr *); 1259 extern int dev_hard_start_xmit(struct sk_buff *skb, 1260 struct net_device *dev, 1261 struct netdev_queue *txq); 1262 1263 extern int netdev_budget; 1264 1265 /* Called by rtnetlink.c:rtnl_unlock() */ 1266 extern void netdev_run_todo(void); 1267 1268 /** 1269 * dev_put - release reference to device 1270 * @dev: network device 1271 * 1272 * Release reference to device to allow it to be freed. 1273 */ 1274 static inline void dev_put(struct net_device *dev) 1275 { 1276 atomic_dec(&dev->refcnt); 1277 } 1278 1279 /** 1280 * dev_hold - get reference to device 1281 * @dev: network device 1282 * 1283 * Hold reference to device to keep it from being freed. 1284 */ 1285 static inline void dev_hold(struct net_device *dev) 1286 { 1287 atomic_inc(&dev->refcnt); 1288 } 1289 1290 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 1291 * and _off may be called from IRQ context, but it is caller 1292 * who is responsible for serialization of these calls. 1293 * 1294 * The name carrier is inappropriate, these functions should really be 1295 * called netif_lowerlayer_*() because they represent the state of any 1296 * kind of lower layer not just hardware media. 1297 */ 1298 1299 extern void linkwatch_fire_event(struct net_device *dev); 1300 1301 /** 1302 * netif_carrier_ok - test if carrier present 1303 * @dev: network device 1304 * 1305 * Check if carrier is present on device 1306 */ 1307 static inline int netif_carrier_ok(const struct net_device *dev) 1308 { 1309 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 1310 } 1311 1312 extern void __netdev_watchdog_up(struct net_device *dev); 1313 1314 extern void netif_carrier_on(struct net_device *dev); 1315 1316 extern void netif_carrier_off(struct net_device *dev); 1317 1318 /** 1319 * netif_dormant_on - mark device as dormant. 1320 * @dev: network device 1321 * 1322 * Mark device as dormant (as per RFC2863). 1323 * 1324 * The dormant state indicates that the relevant interface is not 1325 * actually in a condition to pass packets (i.e., it is not 'up') but is 1326 * in a "pending" state, waiting for some external event. For "on- 1327 * demand" interfaces, this new state identifies the situation where the 1328 * interface is waiting for events to place it in the up state. 1329 * 1330 */ 1331 static inline void netif_dormant_on(struct net_device *dev) 1332 { 1333 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 1334 linkwatch_fire_event(dev); 1335 } 1336 1337 /** 1338 * netif_dormant_off - set device as not dormant. 1339 * @dev: network device 1340 * 1341 * Device is not in dormant state. 1342 */ 1343 static inline void netif_dormant_off(struct net_device *dev) 1344 { 1345 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 1346 linkwatch_fire_event(dev); 1347 } 1348 1349 /** 1350 * netif_dormant - test if carrier present 1351 * @dev: network device 1352 * 1353 * Check if carrier is present on device 1354 */ 1355 static inline int netif_dormant(const struct net_device *dev) 1356 { 1357 return test_bit(__LINK_STATE_DORMANT, &dev->state); 1358 } 1359 1360 1361 /** 1362 * netif_oper_up - test if device is operational 1363 * @dev: network device 1364 * 1365 * Check if carrier is operational 1366 */ 1367 static inline int netif_oper_up(const struct net_device *dev) { 1368 return (dev->operstate == IF_OPER_UP || 1369 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 1370 } 1371 1372 /** 1373 * netif_device_present - is device available or removed 1374 * @dev: network device 1375 * 1376 * Check if device has not been removed from system. 1377 */ 1378 static inline int netif_device_present(struct net_device *dev) 1379 { 1380 return test_bit(__LINK_STATE_PRESENT, &dev->state); 1381 } 1382 1383 extern void netif_device_detach(struct net_device *dev); 1384 1385 extern void netif_device_attach(struct net_device *dev); 1386 1387 /* 1388 * Network interface message level settings 1389 */ 1390 #define HAVE_NETIF_MSG 1 1391 1392 enum { 1393 NETIF_MSG_DRV = 0x0001, 1394 NETIF_MSG_PROBE = 0x0002, 1395 NETIF_MSG_LINK = 0x0004, 1396 NETIF_MSG_TIMER = 0x0008, 1397 NETIF_MSG_IFDOWN = 0x0010, 1398 NETIF_MSG_IFUP = 0x0020, 1399 NETIF_MSG_RX_ERR = 0x0040, 1400 NETIF_MSG_TX_ERR = 0x0080, 1401 NETIF_MSG_TX_QUEUED = 0x0100, 1402 NETIF_MSG_INTR = 0x0200, 1403 NETIF_MSG_TX_DONE = 0x0400, 1404 NETIF_MSG_RX_STATUS = 0x0800, 1405 NETIF_MSG_PKTDATA = 0x1000, 1406 NETIF_MSG_HW = 0x2000, 1407 NETIF_MSG_WOL = 0x4000, 1408 }; 1409 1410 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 1411 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 1412 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 1413 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 1414 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 1415 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 1416 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 1417 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 1418 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 1419 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 1420 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 1421 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 1422 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 1423 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 1424 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 1425 1426 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 1427 { 1428 /* use default */ 1429 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 1430 return default_msg_enable_bits; 1431 if (debug_value == 0) /* no output */ 1432 return 0; 1433 /* set low N bits */ 1434 return (1 << debug_value) - 1; 1435 } 1436 1437 /* Test if receive needs to be scheduled but only if up */ 1438 static inline int netif_rx_schedule_prep(struct net_device *dev, 1439 struct napi_struct *napi) 1440 { 1441 return napi_schedule_prep(napi); 1442 } 1443 1444 /* Add interface to tail of rx poll list. This assumes that _prep has 1445 * already been called and returned 1. 1446 */ 1447 static inline void __netif_rx_schedule(struct net_device *dev, 1448 struct napi_struct *napi) 1449 { 1450 __napi_schedule(napi); 1451 } 1452 1453 /* Try to reschedule poll. Called by irq handler. */ 1454 1455 static inline void netif_rx_schedule(struct net_device *dev, 1456 struct napi_struct *napi) 1457 { 1458 if (netif_rx_schedule_prep(dev, napi)) 1459 __netif_rx_schedule(dev, napi); 1460 } 1461 1462 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). */ 1463 static inline int netif_rx_reschedule(struct net_device *dev, 1464 struct napi_struct *napi) 1465 { 1466 if (napi_schedule_prep(napi)) { 1467 __netif_rx_schedule(dev, napi); 1468 return 1; 1469 } 1470 return 0; 1471 } 1472 1473 /* same as netif_rx_complete, except that local_irq_save(flags) 1474 * has already been issued 1475 */ 1476 static inline void __netif_rx_complete(struct net_device *dev, 1477 struct napi_struct *napi) 1478 { 1479 __napi_complete(napi); 1480 } 1481 1482 /* Remove interface from poll list: it must be in the poll list 1483 * on current cpu. This primitive is called by dev->poll(), when 1484 * it completes the work. The device cannot be out of poll list at this 1485 * moment, it is BUG(). 1486 */ 1487 static inline void netif_rx_complete(struct net_device *dev, 1488 struct napi_struct *napi) 1489 { 1490 unsigned long flags; 1491 1492 local_irq_save(flags); 1493 __netif_rx_complete(dev, napi); 1494 local_irq_restore(flags); 1495 } 1496 1497 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu) 1498 { 1499 spin_lock(&txq->_xmit_lock); 1500 txq->xmit_lock_owner = cpu; 1501 } 1502 1503 static inline void __netif_tx_lock_bh(struct netdev_queue *txq) 1504 { 1505 spin_lock_bh(&txq->_xmit_lock); 1506 txq->xmit_lock_owner = smp_processor_id(); 1507 } 1508 1509 static inline int __netif_tx_trylock(struct netdev_queue *txq) 1510 { 1511 int ok = spin_trylock(&txq->_xmit_lock); 1512 if (likely(ok)) 1513 txq->xmit_lock_owner = smp_processor_id(); 1514 return ok; 1515 } 1516 1517 static inline void __netif_tx_unlock(struct netdev_queue *txq) 1518 { 1519 txq->xmit_lock_owner = -1; 1520 spin_unlock(&txq->_xmit_lock); 1521 } 1522 1523 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq) 1524 { 1525 txq->xmit_lock_owner = -1; 1526 spin_unlock_bh(&txq->_xmit_lock); 1527 } 1528 1529 /** 1530 * netif_tx_lock - grab network device transmit lock 1531 * @dev: network device 1532 * @cpu: cpu number of lock owner 1533 * 1534 * Get network device transmit lock 1535 */ 1536 static inline void netif_tx_lock(struct net_device *dev) 1537 { 1538 unsigned int i; 1539 int cpu; 1540 1541 spin_lock(&dev->tx_global_lock); 1542 cpu = smp_processor_id(); 1543 for (i = 0; i < dev->num_tx_queues; i++) { 1544 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1545 1546 /* We are the only thread of execution doing a 1547 * freeze, but we have to grab the _xmit_lock in 1548 * order to synchronize with threads which are in 1549 * the ->hard_start_xmit() handler and already 1550 * checked the frozen bit. 1551 */ 1552 __netif_tx_lock(txq, cpu); 1553 set_bit(__QUEUE_STATE_FROZEN, &txq->state); 1554 __netif_tx_unlock(txq); 1555 } 1556 } 1557 1558 static inline void netif_tx_lock_bh(struct net_device *dev) 1559 { 1560 local_bh_disable(); 1561 netif_tx_lock(dev); 1562 } 1563 1564 static inline void netif_tx_unlock(struct net_device *dev) 1565 { 1566 unsigned int i; 1567 1568 for (i = 0; i < dev->num_tx_queues; i++) { 1569 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1570 1571 /* No need to grab the _xmit_lock here. If the 1572 * queue is not stopped for another reason, we 1573 * force a schedule. 1574 */ 1575 clear_bit(__QUEUE_STATE_FROZEN, &txq->state); 1576 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state)) 1577 __netif_schedule(txq->qdisc); 1578 } 1579 spin_unlock(&dev->tx_global_lock); 1580 } 1581 1582 static inline void netif_tx_unlock_bh(struct net_device *dev) 1583 { 1584 netif_tx_unlock(dev); 1585 local_bh_enable(); 1586 } 1587 1588 #define HARD_TX_LOCK(dev, txq, cpu) { \ 1589 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1590 __netif_tx_lock(txq, cpu); \ 1591 } \ 1592 } 1593 1594 #define HARD_TX_UNLOCK(dev, txq) { \ 1595 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1596 __netif_tx_unlock(txq); \ 1597 } \ 1598 } 1599 1600 static inline void netif_tx_disable(struct net_device *dev) 1601 { 1602 unsigned int i; 1603 int cpu; 1604 1605 local_bh_disable(); 1606 cpu = smp_processor_id(); 1607 for (i = 0; i < dev->num_tx_queues; i++) { 1608 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1609 1610 __netif_tx_lock(txq, cpu); 1611 netif_tx_stop_queue(txq); 1612 __netif_tx_unlock(txq); 1613 } 1614 local_bh_enable(); 1615 } 1616 1617 static inline void netif_addr_lock(struct net_device *dev) 1618 { 1619 spin_lock(&dev->addr_list_lock); 1620 } 1621 1622 static inline void netif_addr_lock_bh(struct net_device *dev) 1623 { 1624 spin_lock_bh(&dev->addr_list_lock); 1625 } 1626 1627 static inline void netif_addr_unlock(struct net_device *dev) 1628 { 1629 spin_unlock(&dev->addr_list_lock); 1630 } 1631 1632 static inline void netif_addr_unlock_bh(struct net_device *dev) 1633 { 1634 spin_unlock_bh(&dev->addr_list_lock); 1635 } 1636 1637 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 1638 1639 extern void ether_setup(struct net_device *dev); 1640 1641 /* Support for loadable net-drivers */ 1642 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, 1643 void (*setup)(struct net_device *), 1644 unsigned int queue_count); 1645 #define alloc_netdev(sizeof_priv, name, setup) \ 1646 alloc_netdev_mq(sizeof_priv, name, setup, 1) 1647 extern int register_netdev(struct net_device *dev); 1648 extern void unregister_netdev(struct net_device *dev); 1649 /* Functions used for secondary unicast and multicast support */ 1650 extern void dev_set_rx_mode(struct net_device *dev); 1651 extern void __dev_set_rx_mode(struct net_device *dev); 1652 extern int dev_unicast_delete(struct net_device *dev, void *addr, int alen); 1653 extern int dev_unicast_add(struct net_device *dev, void *addr, int alen); 1654 extern int dev_unicast_sync(struct net_device *to, struct net_device *from); 1655 extern void dev_unicast_unsync(struct net_device *to, struct net_device *from); 1656 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all); 1657 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly); 1658 extern int dev_mc_sync(struct net_device *to, struct net_device *from); 1659 extern void dev_mc_unsync(struct net_device *to, struct net_device *from); 1660 extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all); 1661 extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly); 1662 extern int __dev_addr_sync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count); 1663 extern void __dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count); 1664 extern int dev_set_promiscuity(struct net_device *dev, int inc); 1665 extern int dev_set_allmulti(struct net_device *dev, int inc); 1666 extern void netdev_state_change(struct net_device *dev); 1667 extern void netdev_bonding_change(struct net_device *dev); 1668 extern void netdev_features_change(struct net_device *dev); 1669 /* Load a device via the kmod */ 1670 extern void dev_load(struct net *net, const char *name); 1671 extern void dev_mcast_init(void); 1672 extern int netdev_max_backlog; 1673 extern int weight_p; 1674 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 1675 extern int skb_checksum_help(struct sk_buff *skb); 1676 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features); 1677 #ifdef CONFIG_BUG 1678 extern void netdev_rx_csum_fault(struct net_device *dev); 1679 #else 1680 static inline void netdev_rx_csum_fault(struct net_device *dev) 1681 { 1682 } 1683 #endif 1684 /* rx skb timestamps */ 1685 extern void net_enable_timestamp(void); 1686 extern void net_disable_timestamp(void); 1687 1688 #ifdef CONFIG_PROC_FS 1689 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 1690 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 1691 extern void dev_seq_stop(struct seq_file *seq, void *v); 1692 #endif 1693 1694 extern int netdev_class_create_file(struct class_attribute *class_attr); 1695 extern void netdev_class_remove_file(struct class_attribute *class_attr); 1696 1697 extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len); 1698 1699 extern void linkwatch_run_queue(void); 1700 1701 extern int netdev_compute_features(unsigned long all, unsigned long one); 1702 1703 static inline int net_gso_ok(int features, int gso_type) 1704 { 1705 int feature = gso_type << NETIF_F_GSO_SHIFT; 1706 return (features & feature) == feature; 1707 } 1708 1709 static inline int skb_gso_ok(struct sk_buff *skb, int features) 1710 { 1711 return net_gso_ok(features, skb_shinfo(skb)->gso_type); 1712 } 1713 1714 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb) 1715 { 1716 return skb_is_gso(skb) && 1717 (!skb_gso_ok(skb, dev->features) || 1718 unlikely(skb->ip_summed != CHECKSUM_PARTIAL)); 1719 } 1720 1721 static inline void netif_set_gso_max_size(struct net_device *dev, 1722 unsigned int size) 1723 { 1724 dev->gso_max_size = size; 1725 } 1726 1727 /* On bonding slaves other than the currently active slave, suppress 1728 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and 1729 * ARP on active-backup slaves with arp_validate enabled. 1730 */ 1731 static inline int skb_bond_should_drop(struct sk_buff *skb) 1732 { 1733 struct net_device *dev = skb->dev; 1734 struct net_device *master = dev->master; 1735 1736 if (master && 1737 (dev->priv_flags & IFF_SLAVE_INACTIVE)) { 1738 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) && 1739 skb->protocol == __constant_htons(ETH_P_ARP)) 1740 return 0; 1741 1742 if (master->priv_flags & IFF_MASTER_ALB) { 1743 if (skb->pkt_type != PACKET_BROADCAST && 1744 skb->pkt_type != PACKET_MULTICAST) 1745 return 0; 1746 } 1747 if (master->priv_flags & IFF_MASTER_8023AD && 1748 skb->protocol == __constant_htons(ETH_P_SLOW)) 1749 return 0; 1750 1751 return 1; 1752 } 1753 return 0; 1754 } 1755 1756 #endif /* __KERNEL__ */ 1757 1758 #endif /* _LINUX_DEV_H */ 1759