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 struct net_device_subqueue 122 { 123 /* Give a control state for each queue. This struct may contain 124 * per-queue locks in the future. 125 */ 126 unsigned long state; 127 }; 128 129 /* 130 * Network device statistics. Akin to the 2.0 ether stats but 131 * with byte counters. 132 */ 133 134 struct net_device_stats 135 { 136 unsigned long rx_packets; /* total packets received */ 137 unsigned long tx_packets; /* total packets transmitted */ 138 unsigned long rx_bytes; /* total bytes received */ 139 unsigned long tx_bytes; /* total bytes transmitted */ 140 unsigned long rx_errors; /* bad packets received */ 141 unsigned long tx_errors; /* packet transmit problems */ 142 unsigned long rx_dropped; /* no space in linux buffers */ 143 unsigned long tx_dropped; /* no space available in linux */ 144 unsigned long multicast; /* multicast packets received */ 145 unsigned long collisions; 146 147 /* detailed rx_errors: */ 148 unsigned long rx_length_errors; 149 unsigned long rx_over_errors; /* receiver ring buff overflow */ 150 unsigned long rx_crc_errors; /* recved pkt with crc error */ 151 unsigned long rx_frame_errors; /* recv'd frame alignment error */ 152 unsigned long rx_fifo_errors; /* recv'r fifo overrun */ 153 unsigned long rx_missed_errors; /* receiver missed packet */ 154 155 /* detailed tx_errors */ 156 unsigned long tx_aborted_errors; 157 unsigned long tx_carrier_errors; 158 unsigned long tx_fifo_errors; 159 unsigned long tx_heartbeat_errors; 160 unsigned long tx_window_errors; 161 162 /* for cslip etc */ 163 unsigned long rx_compressed; 164 unsigned long tx_compressed; 165 }; 166 167 168 /* Media selection options. */ 169 enum { 170 IF_PORT_UNKNOWN = 0, 171 IF_PORT_10BASE2, 172 IF_PORT_10BASET, 173 IF_PORT_AUI, 174 IF_PORT_100BASET, 175 IF_PORT_100BASETX, 176 IF_PORT_100BASEFX 177 }; 178 179 #ifdef __KERNEL__ 180 181 #include <linux/cache.h> 182 #include <linux/skbuff.h> 183 184 struct neighbour; 185 struct neigh_parms; 186 struct sk_buff; 187 188 struct netif_rx_stats 189 { 190 unsigned total; 191 unsigned dropped; 192 unsigned time_squeeze; 193 unsigned cpu_collision; 194 }; 195 196 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat); 197 198 struct dev_addr_list 199 { 200 struct dev_addr_list *next; 201 u8 da_addr[MAX_ADDR_LEN]; 202 u8 da_addrlen; 203 u8 da_synced; 204 int da_users; 205 int da_gusers; 206 }; 207 208 /* 209 * We tag multicasts with these structures. 210 */ 211 212 #define dev_mc_list dev_addr_list 213 #define dmi_addr da_addr 214 #define dmi_addrlen da_addrlen 215 #define dmi_users da_users 216 #define dmi_gusers da_gusers 217 218 struct hh_cache 219 { 220 struct hh_cache *hh_next; /* Next entry */ 221 atomic_t hh_refcnt; /* number of users */ 222 /* 223 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate 224 * cache line on SMP. 225 * They are mostly read, but hh_refcnt may be changed quite frequently, 226 * incurring cache line ping pongs. 227 */ 228 __be16 hh_type ____cacheline_aligned_in_smp; 229 /* protocol identifier, f.e ETH_P_IP 230 * NOTE: For VLANs, this will be the 231 * encapuslated type. --BLG 232 */ 233 u16 hh_len; /* length of header */ 234 int (*hh_output)(struct sk_buff *skb); 235 seqlock_t hh_lock; 236 237 /* cached hardware header; allow for machine alignment needs. */ 238 #define HH_DATA_MOD 16 239 #define HH_DATA_OFF(__len) \ 240 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) 241 #define HH_DATA_ALIGN(__len) \ 242 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) 243 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; 244 }; 245 246 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much. 247 * Alternative is: 248 * dev->hard_header_len ? (dev->hard_header_len + 249 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 250 * 251 * We could use other alignment values, but we must maintain the 252 * relationship HH alignment <= LL alignment. 253 * 254 * LL_ALLOCATED_SPACE also takes into account the tailroom the device 255 * may need. 256 */ 257 #define LL_RESERVED_SPACE(dev) \ 258 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 259 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 260 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 261 #define LL_ALLOCATED_SPACE(dev) \ 262 ((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 263 264 struct header_ops { 265 int (*create) (struct sk_buff *skb, struct net_device *dev, 266 unsigned short type, const void *daddr, 267 const void *saddr, unsigned len); 268 int (*parse)(const struct sk_buff *skb, unsigned char *haddr); 269 int (*rebuild)(struct sk_buff *skb); 270 #define HAVE_HEADER_CACHE 271 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh); 272 void (*cache_update)(struct hh_cache *hh, 273 const struct net_device *dev, 274 const unsigned char *haddr); 275 }; 276 277 /* These flag bits are private to the generic network queueing 278 * layer, they may not be explicitly referenced by any other 279 * code. 280 */ 281 282 enum netdev_state_t 283 { 284 __LINK_STATE_XOFF=0, 285 __LINK_STATE_START, 286 __LINK_STATE_PRESENT, 287 __LINK_STATE_SCHED, 288 __LINK_STATE_NOCARRIER, 289 __LINK_STATE_LINKWATCH_PENDING, 290 __LINK_STATE_DORMANT, 291 __LINK_STATE_QDISC_RUNNING, 292 }; 293 294 295 /* 296 * This structure holds at boot time configured netdevice settings. They 297 * are then used in the device probing. 298 */ 299 struct netdev_boot_setup { 300 char name[IFNAMSIZ]; 301 struct ifmap map; 302 }; 303 #define NETDEV_BOOT_SETUP_MAX 8 304 305 extern int __init netdev_boot_setup(char *str); 306 307 /* 308 * Structure for NAPI scheduling similar to tasklet but with weighting 309 */ 310 struct napi_struct { 311 /* The poll_list must only be managed by the entity which 312 * changes the state of the NAPI_STATE_SCHED bit. This means 313 * whoever atomically sets that bit can add this napi_struct 314 * to the per-cpu poll_list, and whoever clears that bit 315 * can remove from the list right before clearing the bit. 316 */ 317 struct list_head poll_list; 318 319 unsigned long state; 320 int weight; 321 int (*poll)(struct napi_struct *, int); 322 #ifdef CONFIG_NETPOLL 323 spinlock_t poll_lock; 324 int poll_owner; 325 struct net_device *dev; 326 struct list_head dev_list; 327 #endif 328 }; 329 330 enum 331 { 332 NAPI_STATE_SCHED, /* Poll is scheduled */ 333 NAPI_STATE_DISABLE, /* Disable pending */ 334 }; 335 336 extern void __napi_schedule(struct napi_struct *n); 337 338 static inline int napi_disable_pending(struct napi_struct *n) 339 { 340 return test_bit(NAPI_STATE_DISABLE, &n->state); 341 } 342 343 /** 344 * napi_schedule_prep - check if napi can be scheduled 345 * @n: napi context 346 * 347 * Test if NAPI routine is already running, and if not mark 348 * it as running. This is used as a condition variable 349 * insure only one NAPI poll instance runs. We also make 350 * sure there is no pending NAPI disable. 351 */ 352 static inline int napi_schedule_prep(struct napi_struct *n) 353 { 354 return !napi_disable_pending(n) && 355 !test_and_set_bit(NAPI_STATE_SCHED, &n->state); 356 } 357 358 /** 359 * napi_schedule - schedule NAPI poll 360 * @n: napi context 361 * 362 * Schedule NAPI poll routine to be called if it is not already 363 * running. 364 */ 365 static inline void napi_schedule(struct napi_struct *n) 366 { 367 if (napi_schedule_prep(n)) 368 __napi_schedule(n); 369 } 370 371 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */ 372 static inline int napi_reschedule(struct napi_struct *napi) 373 { 374 if (napi_schedule_prep(napi)) { 375 __napi_schedule(napi); 376 return 1; 377 } 378 return 0; 379 } 380 381 /** 382 * napi_complete - NAPI processing complete 383 * @n: napi context 384 * 385 * Mark NAPI processing as complete. 386 */ 387 static inline void __napi_complete(struct napi_struct *n) 388 { 389 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); 390 list_del(&n->poll_list); 391 smp_mb__before_clear_bit(); 392 clear_bit(NAPI_STATE_SCHED, &n->state); 393 } 394 395 static inline void napi_complete(struct napi_struct *n) 396 { 397 unsigned long flags; 398 399 local_irq_save(flags); 400 __napi_complete(n); 401 local_irq_restore(flags); 402 } 403 404 /** 405 * napi_disable - prevent NAPI from scheduling 406 * @n: napi context 407 * 408 * Stop NAPI from being scheduled on this context. 409 * Waits till any outstanding processing completes. 410 */ 411 static inline void napi_disable(struct napi_struct *n) 412 { 413 set_bit(NAPI_STATE_DISABLE, &n->state); 414 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state)) 415 msleep(1); 416 clear_bit(NAPI_STATE_DISABLE, &n->state); 417 } 418 419 /** 420 * napi_enable - enable NAPI scheduling 421 * @n: napi context 422 * 423 * Resume NAPI from being scheduled on this context. 424 * Must be paired with napi_disable. 425 */ 426 static inline void napi_enable(struct napi_struct *n) 427 { 428 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); 429 smp_mb__before_clear_bit(); 430 clear_bit(NAPI_STATE_SCHED, &n->state); 431 } 432 433 #ifdef CONFIG_SMP 434 /** 435 * napi_synchronize - wait until NAPI is not running 436 * @n: napi context 437 * 438 * Wait until NAPI is done being scheduled on this context. 439 * Waits till any outstanding processing completes but 440 * does not disable future activations. 441 */ 442 static inline void napi_synchronize(const struct napi_struct *n) 443 { 444 while (test_bit(NAPI_STATE_SCHED, &n->state)) 445 msleep(1); 446 } 447 #else 448 # define napi_synchronize(n) barrier() 449 #endif 450 451 /* 452 * The DEVICE structure. 453 * Actually, this whole structure is a big mistake. It mixes I/O 454 * data with strictly "high-level" data, and it has to know about 455 * almost every data structure used in the INET module. 456 * 457 * FIXME: cleanup struct net_device such that network protocol info 458 * moves out. 459 */ 460 461 struct net_device 462 { 463 464 /* 465 * This is the first field of the "visible" part of this structure 466 * (i.e. as seen by users in the "Space.c" file). It is the name 467 * the interface. 468 */ 469 char name[IFNAMSIZ]; 470 /* device name hash chain */ 471 struct hlist_node name_hlist; 472 473 /* 474 * I/O specific fields 475 * FIXME: Merge these and struct ifmap into one 476 */ 477 unsigned long mem_end; /* shared mem end */ 478 unsigned long mem_start; /* shared mem start */ 479 unsigned long base_addr; /* device I/O address */ 480 unsigned int irq; /* device IRQ number */ 481 482 /* 483 * Some hardware also needs these fields, but they are not 484 * part of the usual set specified in Space.c. 485 */ 486 487 unsigned char if_port; /* Selectable AUI, TP,..*/ 488 unsigned char dma; /* DMA channel */ 489 490 unsigned long state; 491 492 struct list_head dev_list; 493 #ifdef CONFIG_NETPOLL 494 struct list_head napi_list; 495 #endif 496 497 /* The device initialization function. Called only once. */ 498 int (*init)(struct net_device *dev); 499 500 /* ------- Fields preinitialized in Space.c finish here ------- */ 501 502 /* Net device features */ 503 unsigned long features; 504 #define NETIF_F_SG 1 /* Scatter/gather IO. */ 505 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */ 506 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ 507 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ 508 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */ 509 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ 510 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ 511 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ 512 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ 513 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ 514 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ 515 #define NETIF_F_GSO 2048 /* Enable software GSO. */ 516 #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */ 517 /* do not use LLTX in new drivers */ 518 #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */ 519 #define NETIF_F_MULTI_QUEUE 16384 /* Has multiple TX/RX queues */ 520 #define NETIF_F_LRO 32768 /* large receive offload */ 521 522 /* Segmentation offload features */ 523 #define NETIF_F_GSO_SHIFT 16 524 #define NETIF_F_GSO_MASK 0xffff0000 525 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT) 526 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT) 527 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT) 528 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT) 529 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT) 530 531 /* List of features with software fallbacks. */ 532 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6) 533 534 535 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM) 536 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM) 537 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM) 538 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM) 539 540 struct net_device *next_sched; 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 struct dev_addr_list *uc_list; /* Secondary unicast mac addresses */ 598 int uc_count; /* Number of installed ucasts */ 599 int uc_promisc; 600 struct dev_addr_list *mc_list; /* Multicast mac addresses */ 601 int mc_count; /* Number of installed mcasts */ 602 int promiscuity; 603 int allmulti; 604 605 606 /* Protocol specific pointers */ 607 608 void *atalk_ptr; /* AppleTalk link */ 609 void *ip_ptr; /* IPv4 specific data */ 610 void *dn_ptr; /* DECnet specific data */ 611 void *ip6_ptr; /* IPv6 specific data */ 612 void *ec_ptr; /* Econet specific data */ 613 void *ax25_ptr; /* AX.25 specific data */ 614 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data, 615 assign before registering */ 616 617 /* 618 * Cache line mostly used on receive path (including eth_type_trans()) 619 */ 620 unsigned long last_rx; /* Time of last Rx */ 621 /* Interface address info used in eth_type_trans() */ 622 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast 623 because most packets are unicast) */ 624 625 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 626 627 /* ingress path synchronizer */ 628 spinlock_t ingress_lock; 629 struct Qdisc *qdisc_ingress; 630 631 /* 632 * Cache line mostly used on queue transmit path (qdisc) 633 */ 634 /* device queue lock */ 635 spinlock_t queue_lock ____cacheline_aligned_in_smp; 636 struct Qdisc *qdisc; 637 struct Qdisc *qdisc_sleeping; 638 struct list_head qdisc_list; 639 unsigned long tx_queue_len; /* Max frames per queue allowed */ 640 641 /* Partially transmitted GSO packet. */ 642 struct sk_buff *gso_skb; 643 644 /* 645 * One part is mostly used on xmit path (device) 646 */ 647 /* hard_start_xmit synchronizer */ 648 spinlock_t _xmit_lock ____cacheline_aligned_in_smp; 649 /* cpu id of processor entered to hard_start_xmit or -1, 650 if nobody entered there. 651 */ 652 int xmit_lock_owner; 653 void *priv; /* pointer to private data */ 654 int (*hard_start_xmit) (struct sk_buff *skb, 655 struct net_device *dev); 656 /* These may be needed for future network-power-down code. */ 657 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 658 659 int watchdog_timeo; /* used by dev_watchdog() */ 660 struct timer_list watchdog_timer; 661 662 /* 663 * refcnt is a very hot point, so align it on SMP 664 */ 665 /* Number of references to this device */ 666 atomic_t refcnt ____cacheline_aligned_in_smp; 667 668 /* delayed register/unregister */ 669 struct list_head todo_list; 670 /* device index hash chain */ 671 struct hlist_node index_hlist; 672 673 struct net_device *link_watch_next; 674 675 /* register/unregister state machine */ 676 enum { NETREG_UNINITIALIZED=0, 677 NETREG_REGISTERED, /* completed register_netdevice */ 678 NETREG_UNREGISTERING, /* called unregister_netdevice */ 679 NETREG_UNREGISTERED, /* completed unregister todo */ 680 NETREG_RELEASED, /* called free_netdev */ 681 } reg_state; 682 683 /* Called after device is detached from network. */ 684 void (*uninit)(struct net_device *dev); 685 /* Called after last user reference disappears. */ 686 void (*destructor)(struct net_device *dev); 687 688 /* Pointers to interface service routines. */ 689 int (*open)(struct net_device *dev); 690 int (*stop)(struct net_device *dev); 691 #define HAVE_NETDEV_POLL 692 #define HAVE_CHANGE_RX_FLAGS 693 void (*change_rx_flags)(struct net_device *dev, 694 int flags); 695 #define HAVE_SET_RX_MODE 696 void (*set_rx_mode)(struct net_device *dev); 697 #define HAVE_MULTICAST 698 void (*set_multicast_list)(struct net_device *dev); 699 #define HAVE_SET_MAC_ADDR 700 int (*set_mac_address)(struct net_device *dev, 701 void *addr); 702 #define HAVE_VALIDATE_ADDR 703 int (*validate_addr)(struct net_device *dev); 704 #define HAVE_PRIVATE_IOCTL 705 int (*do_ioctl)(struct net_device *dev, 706 struct ifreq *ifr, int cmd); 707 #define HAVE_SET_CONFIG 708 int (*set_config)(struct net_device *dev, 709 struct ifmap *map); 710 #define HAVE_CHANGE_MTU 711 int (*change_mtu)(struct net_device *dev, int new_mtu); 712 713 #define HAVE_TX_TIMEOUT 714 void (*tx_timeout) (struct net_device *dev); 715 716 void (*vlan_rx_register)(struct net_device *dev, 717 struct vlan_group *grp); 718 void (*vlan_rx_add_vid)(struct net_device *dev, 719 unsigned short vid); 720 void (*vlan_rx_kill_vid)(struct net_device *dev, 721 unsigned short vid); 722 723 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *); 724 #ifdef CONFIG_NETPOLL 725 struct netpoll_info *npinfo; 726 #endif 727 #ifdef CONFIG_NET_POLL_CONTROLLER 728 void (*poll_controller)(struct net_device *dev); 729 #endif 730 731 #ifdef CONFIG_NET_NS 732 /* Network namespace this network device is inside */ 733 struct net *nd_net; 734 #endif 735 736 /* mid-layer private */ 737 void *ml_priv; 738 739 /* bridge stuff */ 740 struct net_bridge_port *br_port; 741 /* macvlan */ 742 struct macvlan_port *macvlan_port; 743 744 /* class/net/name entry */ 745 struct device dev; 746 /* space for optional statistics and wireless sysfs groups */ 747 struct attribute_group *sysfs_groups[3]; 748 749 /* rtnetlink link ops */ 750 const struct rtnl_link_ops *rtnl_link_ops; 751 752 /* VLAN feature mask */ 753 unsigned long vlan_features; 754 755 /* for setting kernel sock attribute on TCP connection setup */ 756 #define GSO_MAX_SIZE 65536 757 unsigned int gso_max_size; 758 759 /* The TX queue control structures */ 760 unsigned int egress_subqueue_count; 761 struct net_device_subqueue egress_subqueue[1]; 762 }; 763 #define to_net_dev(d) container_of(d, struct net_device, dev) 764 765 #define NETDEV_ALIGN 32 766 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1) 767 768 /* 769 * Net namespace inlines 770 */ 771 static inline 772 struct net *dev_net(const struct net_device *dev) 773 { 774 #ifdef CONFIG_NET_NS 775 return dev->nd_net; 776 #else 777 return &init_net; 778 #endif 779 } 780 781 static inline 782 void dev_net_set(struct net_device *dev, struct net *net) 783 { 784 #ifdef CONFIG_NET_NS 785 release_net(dev->nd_net); 786 dev->nd_net = hold_net(net); 787 #endif 788 } 789 790 /** 791 * netdev_priv - access network device private data 792 * @dev: network device 793 * 794 * Get network device private data 795 */ 796 static inline void *netdev_priv(const struct net_device *dev) 797 { 798 return dev->priv; 799 } 800 801 /* Set the sysfs physical device reference for the network logical device 802 * if set prior to registration will cause a symlink during initialization. 803 */ 804 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) 805 806 /** 807 * netif_napi_add - initialize a napi context 808 * @dev: network device 809 * @napi: napi context 810 * @poll: polling function 811 * @weight: default weight 812 * 813 * netif_napi_add() must be used to initialize a napi context prior to calling 814 * *any* of the other napi related functions. 815 */ 816 static inline void netif_napi_add(struct net_device *dev, 817 struct napi_struct *napi, 818 int (*poll)(struct napi_struct *, int), 819 int weight) 820 { 821 INIT_LIST_HEAD(&napi->poll_list); 822 napi->poll = poll; 823 napi->weight = weight; 824 #ifdef CONFIG_NETPOLL 825 napi->dev = dev; 826 list_add(&napi->dev_list, &dev->napi_list); 827 spin_lock_init(&napi->poll_lock); 828 napi->poll_owner = -1; 829 #endif 830 set_bit(NAPI_STATE_SCHED, &napi->state); 831 } 832 833 struct packet_type { 834 __be16 type; /* This is really htons(ether_type). */ 835 struct net_device *dev; /* NULL is wildcarded here */ 836 int (*func) (struct sk_buff *, 837 struct net_device *, 838 struct packet_type *, 839 struct net_device *); 840 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 841 int features); 842 int (*gso_send_check)(struct sk_buff *skb); 843 void *af_packet_priv; 844 struct list_head list; 845 }; 846 847 #include <linux/interrupt.h> 848 #include <linux/notifier.h> 849 850 extern rwlock_t dev_base_lock; /* Device list lock */ 851 852 853 #define for_each_netdev(net, d) \ 854 list_for_each_entry(d, &(net)->dev_base_head, dev_list) 855 #define for_each_netdev_safe(net, d, n) \ 856 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list) 857 #define for_each_netdev_continue(net, d) \ 858 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list) 859 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) 860 861 static inline struct net_device *next_net_device(struct net_device *dev) 862 { 863 struct list_head *lh; 864 struct net *net; 865 866 net = dev_net(dev); 867 lh = dev->dev_list.next; 868 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 869 } 870 871 static inline struct net_device *first_net_device(struct net *net) 872 { 873 return list_empty(&net->dev_base_head) ? NULL : 874 net_device_entry(net->dev_base_head.next); 875 } 876 877 extern int netdev_boot_setup_check(struct net_device *dev); 878 extern unsigned long netdev_boot_base(const char *prefix, int unit); 879 extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr); 880 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type); 881 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type); 882 extern void dev_add_pack(struct packet_type *pt); 883 extern void dev_remove_pack(struct packet_type *pt); 884 extern void __dev_remove_pack(struct packet_type *pt); 885 886 extern struct net_device *dev_get_by_flags(struct net *net, unsigned short flags, 887 unsigned short mask); 888 extern struct net_device *dev_get_by_name(struct net *net, const char *name); 889 extern struct net_device *__dev_get_by_name(struct net *net, const char *name); 890 extern int dev_alloc_name(struct net_device *dev, const char *name); 891 extern int dev_open(struct net_device *dev); 892 extern int dev_close(struct net_device *dev); 893 extern int dev_queue_xmit(struct sk_buff *skb); 894 extern int register_netdevice(struct net_device *dev); 895 extern void unregister_netdevice(struct net_device *dev); 896 extern void free_netdev(struct net_device *dev); 897 extern void synchronize_net(void); 898 extern int register_netdevice_notifier(struct notifier_block *nb); 899 extern int unregister_netdevice_notifier(struct notifier_block *nb); 900 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev); 901 extern struct net_device *dev_get_by_index(struct net *net, int ifindex); 902 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex); 903 extern int dev_restart(struct net_device *dev); 904 #ifdef CONFIG_NETPOLL_TRAP 905 extern int netpoll_trap(void); 906 #endif 907 908 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, 909 unsigned short type, 910 const void *daddr, const void *saddr, 911 unsigned len) 912 { 913 if (!dev->header_ops || !dev->header_ops->create) 914 return 0; 915 916 return dev->header_ops->create(skb, dev, type, daddr, saddr, len); 917 } 918 919 static inline int dev_parse_header(const struct sk_buff *skb, 920 unsigned char *haddr) 921 { 922 const struct net_device *dev = skb->dev; 923 924 if (!dev->header_ops || !dev->header_ops->parse) 925 return 0; 926 return dev->header_ops->parse(skb, haddr); 927 } 928 929 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 930 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 931 static inline int unregister_gifconf(unsigned int family) 932 { 933 return register_gifconf(family, NULL); 934 } 935 936 /* 937 * Incoming packets are placed on per-cpu queues so that 938 * no locking is needed. 939 */ 940 struct softnet_data 941 { 942 struct net_device *output_queue; 943 struct sk_buff_head input_pkt_queue; 944 struct list_head poll_list; 945 struct sk_buff *completion_queue; 946 947 struct napi_struct backlog; 948 #ifdef CONFIG_NET_DMA 949 struct dma_chan *net_dma; 950 #endif 951 }; 952 953 DECLARE_PER_CPU(struct softnet_data,softnet_data); 954 955 #define HAVE_NETIF_QUEUE 956 957 extern void __netif_schedule(struct net_device *dev); 958 959 static inline void netif_schedule(struct net_device *dev) 960 { 961 if (!test_bit(__LINK_STATE_XOFF, &dev->state)) 962 __netif_schedule(dev); 963 } 964 965 /** 966 * netif_start_queue - allow transmit 967 * @dev: network device 968 * 969 * Allow upper layers to call the device hard_start_xmit routine. 970 */ 971 static inline void netif_start_queue(struct net_device *dev) 972 { 973 clear_bit(__LINK_STATE_XOFF, &dev->state); 974 } 975 976 /** 977 * netif_wake_queue - restart transmit 978 * @dev: network device 979 * 980 * Allow upper layers to call the device hard_start_xmit routine. 981 * Used for flow control when transmit resources are available. 982 */ 983 static inline void netif_wake_queue(struct net_device *dev) 984 { 985 #ifdef CONFIG_NETPOLL_TRAP 986 if (netpoll_trap()) { 987 clear_bit(__LINK_STATE_XOFF, &dev->state); 988 return; 989 } 990 #endif 991 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state)) 992 __netif_schedule(dev); 993 } 994 995 /** 996 * netif_stop_queue - stop transmitted packets 997 * @dev: network device 998 * 999 * Stop upper layers calling the device hard_start_xmit routine. 1000 * Used for flow control when transmit resources are unavailable. 1001 */ 1002 static inline void netif_stop_queue(struct net_device *dev) 1003 { 1004 set_bit(__LINK_STATE_XOFF, &dev->state); 1005 } 1006 1007 /** 1008 * netif_queue_stopped - test if transmit queue is flowblocked 1009 * @dev: network device 1010 * 1011 * Test if transmit queue on device is currently unable to send. 1012 */ 1013 static inline int netif_queue_stopped(const struct net_device *dev) 1014 { 1015 return test_bit(__LINK_STATE_XOFF, &dev->state); 1016 } 1017 1018 /** 1019 * netif_running - test if up 1020 * @dev: network device 1021 * 1022 * Test if the device has been brought up. 1023 */ 1024 static inline int netif_running(const struct net_device *dev) 1025 { 1026 return test_bit(__LINK_STATE_START, &dev->state); 1027 } 1028 1029 /* 1030 * Routines to manage the subqueues on a device. We only need start 1031 * stop, and a check if it's stopped. All other device management is 1032 * done at the overall netdevice level. 1033 * Also test the device if we're multiqueue. 1034 */ 1035 1036 /** 1037 * netif_start_subqueue - allow sending packets on subqueue 1038 * @dev: network device 1039 * @queue_index: sub queue index 1040 * 1041 * Start individual transmit queue of a device with multiple transmit queues. 1042 */ 1043 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 1044 { 1045 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 1046 clear_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state); 1047 #endif 1048 } 1049 1050 /** 1051 * netif_stop_subqueue - stop sending packets on subqueue 1052 * @dev: network device 1053 * @queue_index: sub queue index 1054 * 1055 * Stop individual transmit queue of a device with multiple transmit queues. 1056 */ 1057 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 1058 { 1059 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 1060 #ifdef CONFIG_NETPOLL_TRAP 1061 if (netpoll_trap()) 1062 return; 1063 #endif 1064 set_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state); 1065 #endif 1066 } 1067 1068 /** 1069 * netif_subqueue_stopped - test status of subqueue 1070 * @dev: network device 1071 * @queue_index: sub queue index 1072 * 1073 * Check individual transmit queue of a device with multiple transmit queues. 1074 */ 1075 static inline int __netif_subqueue_stopped(const struct net_device *dev, 1076 u16 queue_index) 1077 { 1078 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 1079 return test_bit(__LINK_STATE_XOFF, 1080 &dev->egress_subqueue[queue_index].state); 1081 #else 1082 return 0; 1083 #endif 1084 } 1085 1086 static inline int netif_subqueue_stopped(const struct net_device *dev, 1087 struct sk_buff *skb) 1088 { 1089 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb)); 1090 } 1091 1092 /** 1093 * netif_wake_subqueue - allow sending packets on subqueue 1094 * @dev: network device 1095 * @queue_index: sub queue index 1096 * 1097 * Resume individual transmit queue of a device with multiple transmit queues. 1098 */ 1099 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 1100 { 1101 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 1102 #ifdef CONFIG_NETPOLL_TRAP 1103 if (netpoll_trap()) 1104 return; 1105 #endif 1106 if (test_and_clear_bit(__LINK_STATE_XOFF, 1107 &dev->egress_subqueue[queue_index].state)) 1108 __netif_schedule(dev); 1109 #endif 1110 } 1111 1112 /** 1113 * netif_is_multiqueue - test if device has multiple transmit queues 1114 * @dev: network device 1115 * 1116 * Check if device has multiple transmit queues 1117 * Always falls if NETDEVICE_MULTIQUEUE is not configured 1118 */ 1119 static inline int netif_is_multiqueue(const struct net_device *dev) 1120 { 1121 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 1122 return (!!(NETIF_F_MULTI_QUEUE & dev->features)); 1123 #else 1124 return 0; 1125 #endif 1126 } 1127 1128 /* Use this variant when it is known for sure that it 1129 * is executing from hardware interrupt context or with hardware interrupts 1130 * disabled. 1131 */ 1132 extern void dev_kfree_skb_irq(struct sk_buff *skb); 1133 1134 /* Use this variant in places where it could be invoked 1135 * from either hardware interrupt or other context, with hardware interrupts 1136 * either disabled or enabled. 1137 */ 1138 extern void dev_kfree_skb_any(struct sk_buff *skb); 1139 1140 #define HAVE_NETIF_RX 1 1141 extern int netif_rx(struct sk_buff *skb); 1142 extern int netif_rx_ni(struct sk_buff *skb); 1143 #define HAVE_NETIF_RECEIVE_SKB 1 1144 extern int netif_receive_skb(struct sk_buff *skb); 1145 extern int dev_valid_name(const char *name); 1146 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *); 1147 extern int dev_ethtool(struct net *net, struct ifreq *); 1148 extern unsigned dev_get_flags(const struct net_device *); 1149 extern int dev_change_flags(struct net_device *, unsigned); 1150 extern int dev_change_name(struct net_device *, char *); 1151 extern int dev_change_net_namespace(struct net_device *, 1152 struct net *, const char *); 1153 extern int dev_set_mtu(struct net_device *, int); 1154 extern int dev_set_mac_address(struct net_device *, 1155 struct sockaddr *); 1156 extern int dev_hard_start_xmit(struct sk_buff *skb, 1157 struct net_device *dev); 1158 1159 extern int netdev_budget; 1160 1161 /* Called by rtnetlink.c:rtnl_unlock() */ 1162 extern void netdev_run_todo(void); 1163 1164 /** 1165 * dev_put - release reference to device 1166 * @dev: network device 1167 * 1168 * Release reference to device to allow it to be freed. 1169 */ 1170 static inline void dev_put(struct net_device *dev) 1171 { 1172 atomic_dec(&dev->refcnt); 1173 } 1174 1175 /** 1176 * dev_hold - get reference to device 1177 * @dev: network device 1178 * 1179 * Hold reference to device to keep it from being freed. 1180 */ 1181 static inline void dev_hold(struct net_device *dev) 1182 { 1183 atomic_inc(&dev->refcnt); 1184 } 1185 1186 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 1187 * and _off may be called from IRQ context, but it is caller 1188 * who is responsible for serialization of these calls. 1189 * 1190 * The name carrier is inappropriate, these functions should really be 1191 * called netif_lowerlayer_*() because they represent the state of any 1192 * kind of lower layer not just hardware media. 1193 */ 1194 1195 extern void linkwatch_fire_event(struct net_device *dev); 1196 1197 /** 1198 * netif_carrier_ok - test if carrier present 1199 * @dev: network device 1200 * 1201 * Check if carrier is present on device 1202 */ 1203 static inline int netif_carrier_ok(const struct net_device *dev) 1204 { 1205 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 1206 } 1207 1208 extern void __netdev_watchdog_up(struct net_device *dev); 1209 1210 extern void netif_carrier_on(struct net_device *dev); 1211 1212 extern void netif_carrier_off(struct net_device *dev); 1213 1214 /** 1215 * netif_dormant_on - mark device as dormant. 1216 * @dev: network device 1217 * 1218 * Mark device as dormant (as per RFC2863). 1219 * 1220 * The dormant state indicates that the relevant interface is not 1221 * actually in a condition to pass packets (i.e., it is not 'up') but is 1222 * in a "pending" state, waiting for some external event. For "on- 1223 * demand" interfaces, this new state identifies the situation where the 1224 * interface is waiting for events to place it in the up state. 1225 * 1226 */ 1227 static inline void netif_dormant_on(struct net_device *dev) 1228 { 1229 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 1230 linkwatch_fire_event(dev); 1231 } 1232 1233 /** 1234 * netif_dormant_off - set device as not dormant. 1235 * @dev: network device 1236 * 1237 * Device is not in dormant state. 1238 */ 1239 static inline void netif_dormant_off(struct net_device *dev) 1240 { 1241 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 1242 linkwatch_fire_event(dev); 1243 } 1244 1245 /** 1246 * netif_dormant - test if carrier present 1247 * @dev: network device 1248 * 1249 * Check if carrier is present on device 1250 */ 1251 static inline int netif_dormant(const struct net_device *dev) 1252 { 1253 return test_bit(__LINK_STATE_DORMANT, &dev->state); 1254 } 1255 1256 1257 /** 1258 * netif_oper_up - test if device is operational 1259 * @dev: network device 1260 * 1261 * Check if carrier is operational 1262 */ 1263 static inline int netif_oper_up(const struct net_device *dev) { 1264 return (dev->operstate == IF_OPER_UP || 1265 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 1266 } 1267 1268 /** 1269 * netif_device_present - is device available or removed 1270 * @dev: network device 1271 * 1272 * Check if device has not been removed from system. 1273 */ 1274 static inline int netif_device_present(struct net_device *dev) 1275 { 1276 return test_bit(__LINK_STATE_PRESENT, &dev->state); 1277 } 1278 1279 extern void netif_device_detach(struct net_device *dev); 1280 1281 extern void netif_device_attach(struct net_device *dev); 1282 1283 /* 1284 * Network interface message level settings 1285 */ 1286 #define HAVE_NETIF_MSG 1 1287 1288 enum { 1289 NETIF_MSG_DRV = 0x0001, 1290 NETIF_MSG_PROBE = 0x0002, 1291 NETIF_MSG_LINK = 0x0004, 1292 NETIF_MSG_TIMER = 0x0008, 1293 NETIF_MSG_IFDOWN = 0x0010, 1294 NETIF_MSG_IFUP = 0x0020, 1295 NETIF_MSG_RX_ERR = 0x0040, 1296 NETIF_MSG_TX_ERR = 0x0080, 1297 NETIF_MSG_TX_QUEUED = 0x0100, 1298 NETIF_MSG_INTR = 0x0200, 1299 NETIF_MSG_TX_DONE = 0x0400, 1300 NETIF_MSG_RX_STATUS = 0x0800, 1301 NETIF_MSG_PKTDATA = 0x1000, 1302 NETIF_MSG_HW = 0x2000, 1303 NETIF_MSG_WOL = 0x4000, 1304 }; 1305 1306 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 1307 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 1308 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 1309 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 1310 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 1311 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 1312 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 1313 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 1314 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 1315 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 1316 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 1317 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 1318 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 1319 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 1320 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 1321 1322 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 1323 { 1324 /* use default */ 1325 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 1326 return default_msg_enable_bits; 1327 if (debug_value == 0) /* no output */ 1328 return 0; 1329 /* set low N bits */ 1330 return (1 << debug_value) - 1; 1331 } 1332 1333 /* Test if receive needs to be scheduled but only if up */ 1334 static inline int netif_rx_schedule_prep(struct net_device *dev, 1335 struct napi_struct *napi) 1336 { 1337 return napi_schedule_prep(napi); 1338 } 1339 1340 /* Add interface to tail of rx poll list. This assumes that _prep has 1341 * already been called and returned 1. 1342 */ 1343 static inline void __netif_rx_schedule(struct net_device *dev, 1344 struct napi_struct *napi) 1345 { 1346 __napi_schedule(napi); 1347 } 1348 1349 /* Try to reschedule poll. Called by irq handler. */ 1350 1351 static inline void netif_rx_schedule(struct net_device *dev, 1352 struct napi_struct *napi) 1353 { 1354 if (netif_rx_schedule_prep(dev, napi)) 1355 __netif_rx_schedule(dev, napi); 1356 } 1357 1358 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). */ 1359 static inline int netif_rx_reschedule(struct net_device *dev, 1360 struct napi_struct *napi) 1361 { 1362 if (napi_schedule_prep(napi)) { 1363 __netif_rx_schedule(dev, napi); 1364 return 1; 1365 } 1366 return 0; 1367 } 1368 1369 /* same as netif_rx_complete, except that local_irq_save(flags) 1370 * has already been issued 1371 */ 1372 static inline void __netif_rx_complete(struct net_device *dev, 1373 struct napi_struct *napi) 1374 { 1375 __napi_complete(napi); 1376 } 1377 1378 /* Remove interface from poll list: it must be in the poll list 1379 * on current cpu. This primitive is called by dev->poll(), when 1380 * it completes the work. The device cannot be out of poll list at this 1381 * moment, it is BUG(). 1382 */ 1383 static inline void netif_rx_complete(struct net_device *dev, 1384 struct napi_struct *napi) 1385 { 1386 unsigned long flags; 1387 1388 local_irq_save(flags); 1389 __netif_rx_complete(dev, napi); 1390 local_irq_restore(flags); 1391 } 1392 1393 /** 1394 * netif_tx_lock - grab network device transmit lock 1395 * @dev: network device 1396 * @cpu: cpu number of lock owner 1397 * 1398 * Get network device transmit lock 1399 */ 1400 static inline void __netif_tx_lock(struct net_device *dev, int cpu) 1401 { 1402 spin_lock(&dev->_xmit_lock); 1403 dev->xmit_lock_owner = cpu; 1404 } 1405 1406 static inline void netif_tx_lock(struct net_device *dev) 1407 { 1408 __netif_tx_lock(dev, smp_processor_id()); 1409 } 1410 1411 static inline void netif_tx_lock_bh(struct net_device *dev) 1412 { 1413 spin_lock_bh(&dev->_xmit_lock); 1414 dev->xmit_lock_owner = smp_processor_id(); 1415 } 1416 1417 static inline int netif_tx_trylock(struct net_device *dev) 1418 { 1419 int ok = spin_trylock(&dev->_xmit_lock); 1420 if (likely(ok)) 1421 dev->xmit_lock_owner = smp_processor_id(); 1422 return ok; 1423 } 1424 1425 static inline void netif_tx_unlock(struct net_device *dev) 1426 { 1427 dev->xmit_lock_owner = -1; 1428 spin_unlock(&dev->_xmit_lock); 1429 } 1430 1431 static inline void netif_tx_unlock_bh(struct net_device *dev) 1432 { 1433 dev->xmit_lock_owner = -1; 1434 spin_unlock_bh(&dev->_xmit_lock); 1435 } 1436 1437 #define HARD_TX_LOCK(dev, cpu) { \ 1438 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1439 __netif_tx_lock(dev, cpu); \ 1440 } \ 1441 } 1442 1443 #define HARD_TX_UNLOCK(dev) { \ 1444 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1445 netif_tx_unlock(dev); \ 1446 } \ 1447 } 1448 1449 static inline void netif_tx_disable(struct net_device *dev) 1450 { 1451 netif_tx_lock_bh(dev); 1452 netif_stop_queue(dev); 1453 netif_tx_unlock_bh(dev); 1454 } 1455 1456 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 1457 1458 extern void ether_setup(struct net_device *dev); 1459 1460 /* Support for loadable net-drivers */ 1461 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, 1462 void (*setup)(struct net_device *), 1463 unsigned int queue_count); 1464 #define alloc_netdev(sizeof_priv, name, setup) \ 1465 alloc_netdev_mq(sizeof_priv, name, setup, 1) 1466 extern int register_netdev(struct net_device *dev); 1467 extern void unregister_netdev(struct net_device *dev); 1468 /* Functions used for secondary unicast and multicast support */ 1469 extern void dev_set_rx_mode(struct net_device *dev); 1470 extern void __dev_set_rx_mode(struct net_device *dev); 1471 extern int dev_unicast_delete(struct net_device *dev, void *addr, int alen); 1472 extern int dev_unicast_add(struct net_device *dev, void *addr, int alen); 1473 extern int dev_unicast_sync(struct net_device *to, struct net_device *from); 1474 extern void dev_unicast_unsync(struct net_device *to, struct net_device *from); 1475 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all); 1476 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly); 1477 extern int dev_mc_sync(struct net_device *to, struct net_device *from); 1478 extern void dev_mc_unsync(struct net_device *to, struct net_device *from); 1479 extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all); 1480 extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly); 1481 extern int __dev_addr_sync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count); 1482 extern void __dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count); 1483 extern void dev_set_promiscuity(struct net_device *dev, int inc); 1484 extern void dev_set_allmulti(struct net_device *dev, int inc); 1485 extern void netdev_state_change(struct net_device *dev); 1486 extern void netdev_features_change(struct net_device *dev); 1487 /* Load a device via the kmod */ 1488 extern void dev_load(struct net *net, const char *name); 1489 extern void dev_mcast_init(void); 1490 extern int netdev_max_backlog; 1491 extern int weight_p; 1492 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 1493 extern int skb_checksum_help(struct sk_buff *skb); 1494 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features); 1495 #ifdef CONFIG_BUG 1496 extern void netdev_rx_csum_fault(struct net_device *dev); 1497 #else 1498 static inline void netdev_rx_csum_fault(struct net_device *dev) 1499 { 1500 } 1501 #endif 1502 /* rx skb timestamps */ 1503 extern void net_enable_timestamp(void); 1504 extern void net_disable_timestamp(void); 1505 1506 #ifdef CONFIG_PROC_FS 1507 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 1508 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 1509 extern void dev_seq_stop(struct seq_file *seq, void *v); 1510 #endif 1511 1512 extern void linkwatch_run_queue(void); 1513 1514 extern int netdev_compute_features(unsigned long all, unsigned long one); 1515 1516 static inline int net_gso_ok(int features, int gso_type) 1517 { 1518 int feature = gso_type << NETIF_F_GSO_SHIFT; 1519 return (features & feature) == feature; 1520 } 1521 1522 static inline int skb_gso_ok(struct sk_buff *skb, int features) 1523 { 1524 return net_gso_ok(features, skb_shinfo(skb)->gso_type); 1525 } 1526 1527 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb) 1528 { 1529 return skb_is_gso(skb) && 1530 (!skb_gso_ok(skb, dev->features) || 1531 unlikely(skb->ip_summed != CHECKSUM_PARTIAL)); 1532 } 1533 1534 static inline void netif_set_gso_max_size(struct net_device *dev, 1535 unsigned int size) 1536 { 1537 dev->gso_max_size = size; 1538 } 1539 1540 /* On bonding slaves other than the currently active slave, suppress 1541 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and 1542 * ARP on active-backup slaves with arp_validate enabled. 1543 */ 1544 static inline int skb_bond_should_drop(struct sk_buff *skb) 1545 { 1546 struct net_device *dev = skb->dev; 1547 struct net_device *master = dev->master; 1548 1549 if (master && 1550 (dev->priv_flags & IFF_SLAVE_INACTIVE)) { 1551 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) && 1552 skb->protocol == __constant_htons(ETH_P_ARP)) 1553 return 0; 1554 1555 if (master->priv_flags & IFF_MASTER_ALB) { 1556 if (skb->pkt_type != PACKET_BROADCAST && 1557 skb->pkt_type != PACKET_MULTICAST) 1558 return 0; 1559 } 1560 if (master->priv_flags & IFF_MASTER_8023AD && 1561 skb->protocol == __constant_htons(ETH_P_SLOW)) 1562 return 0; 1563 1564 return 1; 1565 } 1566 return 0; 1567 } 1568 1569 #endif /* __KERNEL__ */ 1570 1571 #endif /* _LINUX_DEV_H */ 1572