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