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