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 /* 92 * Compute the worst case header length according to the protocols 93 * used. 94 */ 95 96 #if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR) 97 #define LL_MAX_HEADER 32 98 #else 99 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 100 #define LL_MAX_HEADER 96 101 #else 102 #define LL_MAX_HEADER 48 103 #endif 104 #endif 105 106 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \ 107 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \ 108 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \ 109 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE) 110 #define MAX_HEADER LL_MAX_HEADER 111 #else 112 #define MAX_HEADER (LL_MAX_HEADER + 48) 113 #endif 114 115 struct net_device_subqueue 116 { 117 /* Give a control state for each queue. This struct may contain 118 * per-queue locks in the future. 119 */ 120 unsigned long state; 121 }; 122 123 /* 124 * Network device statistics. Akin to the 2.0 ether stats but 125 * with byte counters. 126 */ 127 128 struct net_device_stats 129 { 130 unsigned long rx_packets; /* total packets received */ 131 unsigned long tx_packets; /* total packets transmitted */ 132 unsigned long rx_bytes; /* total bytes received */ 133 unsigned long tx_bytes; /* total bytes transmitted */ 134 unsigned long rx_errors; /* bad packets received */ 135 unsigned long tx_errors; /* packet transmit problems */ 136 unsigned long rx_dropped; /* no space in linux buffers */ 137 unsigned long tx_dropped; /* no space available in linux */ 138 unsigned long multicast; /* multicast packets received */ 139 unsigned long collisions; 140 141 /* detailed rx_errors: */ 142 unsigned long rx_length_errors; 143 unsigned long rx_over_errors; /* receiver ring buff overflow */ 144 unsigned long rx_crc_errors; /* recved pkt with crc error */ 145 unsigned long rx_frame_errors; /* recv'd frame alignment error */ 146 unsigned long rx_fifo_errors; /* recv'r fifo overrun */ 147 unsigned long rx_missed_errors; /* receiver missed packet */ 148 149 /* detailed tx_errors */ 150 unsigned long tx_aborted_errors; 151 unsigned long tx_carrier_errors; 152 unsigned long tx_fifo_errors; 153 unsigned long tx_heartbeat_errors; 154 unsigned long tx_window_errors; 155 156 /* for cslip etc */ 157 unsigned long rx_compressed; 158 unsigned long tx_compressed; 159 }; 160 161 162 /* Media selection options. */ 163 enum { 164 IF_PORT_UNKNOWN = 0, 165 IF_PORT_10BASE2, 166 IF_PORT_10BASET, 167 IF_PORT_AUI, 168 IF_PORT_100BASET, 169 IF_PORT_100BASETX, 170 IF_PORT_100BASEFX 171 }; 172 173 #ifdef __KERNEL__ 174 175 #include <linux/cache.h> 176 #include <linux/skbuff.h> 177 178 struct neighbour; 179 struct neigh_parms; 180 struct sk_buff; 181 182 struct netif_rx_stats 183 { 184 unsigned total; 185 unsigned dropped; 186 unsigned time_squeeze; 187 unsigned cpu_collision; 188 }; 189 190 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat); 191 192 struct dev_addr_list 193 { 194 struct dev_addr_list *next; 195 u8 da_addr[MAX_ADDR_LEN]; 196 u8 da_addrlen; 197 u8 da_synced; 198 int da_users; 199 int da_gusers; 200 }; 201 202 /* 203 * We tag multicasts with these structures. 204 */ 205 206 #define dev_mc_list dev_addr_list 207 #define dmi_addr da_addr 208 #define dmi_addrlen da_addrlen 209 #define dmi_users da_users 210 #define dmi_gusers da_gusers 211 212 struct hh_cache 213 { 214 struct hh_cache *hh_next; /* Next entry */ 215 atomic_t hh_refcnt; /* number of users */ 216 /* 217 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate 218 * cache line on SMP. 219 * They are mostly read, but hh_refcnt may be changed quite frequently, 220 * incurring cache line ping pongs. 221 */ 222 __be16 hh_type ____cacheline_aligned_in_smp; 223 /* protocol identifier, f.e ETH_P_IP 224 * NOTE: For VLANs, this will be the 225 * encapuslated type. --BLG 226 */ 227 u16 hh_len; /* length of header */ 228 int (*hh_output)(struct sk_buff *skb); 229 seqlock_t hh_lock; 230 231 /* cached hardware header; allow for machine alignment needs. */ 232 #define HH_DATA_MOD 16 233 #define HH_DATA_OFF(__len) \ 234 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) 235 #define HH_DATA_ALIGN(__len) \ 236 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) 237 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; 238 }; 239 240 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much. 241 * Alternative is: 242 * dev->hard_header_len ? (dev->hard_header_len + 243 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 244 * 245 * We could use other alignment values, but we must maintain the 246 * relationship HH alignment <= LL alignment. 247 */ 248 #define LL_RESERVED_SPACE(dev) \ 249 (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 250 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 251 ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 252 253 struct header_ops { 254 int (*create) (struct sk_buff *skb, struct net_device *dev, 255 unsigned short type, const void *daddr, 256 const void *saddr, unsigned len); 257 int (*parse)(const struct sk_buff *skb, unsigned char *haddr); 258 int (*rebuild)(struct sk_buff *skb); 259 #define HAVE_HEADER_CACHE 260 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh); 261 void (*cache_update)(struct hh_cache *hh, 262 const struct net_device *dev, 263 const unsigned char *haddr); 264 }; 265 266 /* These flag bits are private to the generic network queueing 267 * layer, they may not be explicitly referenced by any other 268 * code. 269 */ 270 271 enum netdev_state_t 272 { 273 __LINK_STATE_XOFF=0, 274 __LINK_STATE_START, 275 __LINK_STATE_PRESENT, 276 __LINK_STATE_SCHED, 277 __LINK_STATE_NOCARRIER, 278 __LINK_STATE_LINKWATCH_PENDING, 279 __LINK_STATE_DORMANT, 280 __LINK_STATE_QDISC_RUNNING, 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 /* 441 * The DEVICE structure. 442 * Actually, this whole structure is a big mistake. It mixes I/O 443 * data with strictly "high-level" data, and it has to know about 444 * almost every data structure used in the INET module. 445 * 446 * FIXME: cleanup struct net_device such that network protocol info 447 * moves out. 448 */ 449 450 struct net_device 451 { 452 453 /* 454 * This is the first field of the "visible" part of this structure 455 * (i.e. as seen by users in the "Space.c" file). It is the name 456 * the interface. 457 */ 458 char name[IFNAMSIZ]; 459 /* device name hash chain */ 460 struct hlist_node name_hlist; 461 462 /* 463 * I/O specific fields 464 * FIXME: Merge these and struct ifmap into one 465 */ 466 unsigned long mem_end; /* shared mem end */ 467 unsigned long mem_start; /* shared mem start */ 468 unsigned long base_addr; /* device I/O address */ 469 unsigned int irq; /* device IRQ number */ 470 471 /* 472 * Some hardware also needs these fields, but they are not 473 * part of the usual set specified in Space.c. 474 */ 475 476 unsigned char if_port; /* Selectable AUI, TP,..*/ 477 unsigned char dma; /* DMA channel */ 478 479 unsigned long state; 480 481 struct list_head dev_list; 482 #ifdef CONFIG_NETPOLL 483 struct list_head napi_list; 484 #endif 485 486 /* The device initialization function. Called only once. */ 487 int (*init)(struct net_device *dev); 488 489 /* ------- Fields preinitialized in Space.c finish here ------- */ 490 491 /* Net device features */ 492 unsigned long features; 493 #define NETIF_F_SG 1 /* Scatter/gather IO. */ 494 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */ 495 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ 496 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ 497 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */ 498 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ 499 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ 500 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ 501 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ 502 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ 503 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ 504 #define NETIF_F_GSO 2048 /* Enable software GSO. */ 505 #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */ 506 /* do not use LLTX in new drivers */ 507 #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */ 508 #define NETIF_F_MULTI_QUEUE 16384 /* Has multiple TX/RX queues */ 509 #define NETIF_F_LRO 32768 /* large receive offload */ 510 511 /* Segmentation offload features */ 512 #define NETIF_F_GSO_SHIFT 16 513 #define NETIF_F_GSO_MASK 0xffff0000 514 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT) 515 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT) 516 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT) 517 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT) 518 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT) 519 520 /* List of features with software fallbacks. */ 521 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6) 522 523 524 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM) 525 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM) 526 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM) 527 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM) 528 529 struct net_device *next_sched; 530 531 /* Interface index. Unique device identifier */ 532 int ifindex; 533 int iflink; 534 535 536 struct net_device_stats* (*get_stats)(struct net_device *dev); 537 struct net_device_stats stats; 538 539 #ifdef CONFIG_WIRELESS_EXT 540 /* List of functions to handle Wireless Extensions (instead of ioctl). 541 * See <net/iw_handler.h> for details. Jean II */ 542 const struct iw_handler_def * wireless_handlers; 543 /* Instance data managed by the core of Wireless Extensions. */ 544 struct iw_public_data * wireless_data; 545 #endif 546 const struct ethtool_ops *ethtool_ops; 547 548 /* Hardware header description */ 549 const struct header_ops *header_ops; 550 551 /* 552 * This marks the end of the "visible" part of the structure. All 553 * fields hereafter are internal to the system, and may change at 554 * will (read: may be cleaned up at will). 555 */ 556 557 558 unsigned int flags; /* interface flags (a la BSD) */ 559 unsigned short gflags; 560 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ 561 unsigned short padded; /* How much padding added by alloc_netdev() */ 562 563 unsigned char operstate; /* RFC2863 operstate */ 564 unsigned char link_mode; /* mapping policy to operstate */ 565 566 unsigned mtu; /* interface MTU value */ 567 unsigned short type; /* interface hardware type */ 568 unsigned short hard_header_len; /* hardware hdr length */ 569 570 struct net_device *master; /* Pointer to master device of a group, 571 * which this device is member of. 572 */ 573 574 /* Interface address info. */ 575 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ 576 unsigned char addr_len; /* hardware address length */ 577 unsigned short dev_id; /* for shared network cards */ 578 579 struct dev_addr_list *uc_list; /* Secondary unicast mac addresses */ 580 int uc_count; /* Number of installed ucasts */ 581 int uc_promisc; 582 struct dev_addr_list *mc_list; /* Multicast mac addresses */ 583 int mc_count; /* Number of installed mcasts */ 584 int promiscuity; 585 int allmulti; 586 587 588 /* Protocol specific pointers */ 589 590 void *atalk_ptr; /* AppleTalk link */ 591 void *ip_ptr; /* IPv4 specific data */ 592 void *dn_ptr; /* DECnet specific data */ 593 void *ip6_ptr; /* IPv6 specific data */ 594 void *ec_ptr; /* Econet specific data */ 595 void *ax25_ptr; /* AX.25 specific data */ 596 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data, 597 assign before registering */ 598 599 /* 600 * Cache line mostly used on receive path (including eth_type_trans()) 601 */ 602 unsigned long last_rx; /* Time of last Rx */ 603 /* Interface address info used in eth_type_trans() */ 604 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast 605 because most packets are unicast) */ 606 607 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 608 609 /* ingress path synchronizer */ 610 spinlock_t ingress_lock; 611 struct Qdisc *qdisc_ingress; 612 613 /* 614 * Cache line mostly used on queue transmit path (qdisc) 615 */ 616 /* device queue lock */ 617 spinlock_t queue_lock ____cacheline_aligned_in_smp; 618 struct Qdisc *qdisc; 619 struct Qdisc *qdisc_sleeping; 620 struct list_head qdisc_list; 621 unsigned long tx_queue_len; /* Max frames per queue allowed */ 622 623 /* Partially transmitted GSO packet. */ 624 struct sk_buff *gso_skb; 625 626 /* 627 * One part is mostly used on xmit path (device) 628 */ 629 /* hard_start_xmit synchronizer */ 630 spinlock_t _xmit_lock ____cacheline_aligned_in_smp; 631 /* cpu id of processor entered to hard_start_xmit or -1, 632 if nobody entered there. 633 */ 634 int xmit_lock_owner; 635 void *priv; /* pointer to private data */ 636 int (*hard_start_xmit) (struct sk_buff *skb, 637 struct net_device *dev); 638 /* These may be needed for future network-power-down code. */ 639 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 640 641 int watchdog_timeo; /* used by dev_watchdog() */ 642 struct timer_list watchdog_timer; 643 644 /* 645 * refcnt is a very hot point, so align it on SMP 646 */ 647 /* Number of references to this device */ 648 atomic_t refcnt ____cacheline_aligned_in_smp; 649 650 /* delayed register/unregister */ 651 struct list_head todo_list; 652 /* device index hash chain */ 653 struct hlist_node index_hlist; 654 655 struct net_device *link_watch_next; 656 657 /* register/unregister state machine */ 658 enum { NETREG_UNINITIALIZED=0, 659 NETREG_REGISTERED, /* completed register_netdevice */ 660 NETREG_UNREGISTERING, /* called unregister_netdevice */ 661 NETREG_UNREGISTERED, /* completed unregister todo */ 662 NETREG_RELEASED, /* called free_netdev */ 663 } reg_state; 664 665 /* Called after device is detached from network. */ 666 void (*uninit)(struct net_device *dev); 667 /* Called after last user reference disappears. */ 668 void (*destructor)(struct net_device *dev); 669 670 /* Pointers to interface service routines. */ 671 int (*open)(struct net_device *dev); 672 int (*stop)(struct net_device *dev); 673 #define HAVE_NETDEV_POLL 674 #define HAVE_CHANGE_RX_FLAGS 675 void (*change_rx_flags)(struct net_device *dev, 676 int flags); 677 #define HAVE_SET_RX_MODE 678 void (*set_rx_mode)(struct net_device *dev); 679 #define HAVE_MULTICAST 680 void (*set_multicast_list)(struct net_device *dev); 681 #define HAVE_SET_MAC_ADDR 682 int (*set_mac_address)(struct net_device *dev, 683 void *addr); 684 #define HAVE_VALIDATE_ADDR 685 int (*validate_addr)(struct net_device *dev); 686 #define HAVE_PRIVATE_IOCTL 687 int (*do_ioctl)(struct net_device *dev, 688 struct ifreq *ifr, int cmd); 689 #define HAVE_SET_CONFIG 690 int (*set_config)(struct net_device *dev, 691 struct ifmap *map); 692 #define HAVE_CHANGE_MTU 693 int (*change_mtu)(struct net_device *dev, int new_mtu); 694 695 #define HAVE_TX_TIMEOUT 696 void (*tx_timeout) (struct net_device *dev); 697 698 void (*vlan_rx_register)(struct net_device *dev, 699 struct vlan_group *grp); 700 void (*vlan_rx_add_vid)(struct net_device *dev, 701 unsigned short vid); 702 void (*vlan_rx_kill_vid)(struct net_device *dev, 703 unsigned short vid); 704 705 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *); 706 #ifdef CONFIG_NETPOLL 707 struct netpoll_info *npinfo; 708 #endif 709 #ifdef CONFIG_NET_POLL_CONTROLLER 710 void (*poll_controller)(struct net_device *dev); 711 #endif 712 713 /* Network namespace this network device is inside */ 714 struct net *nd_net; 715 716 /* bridge stuff */ 717 struct net_bridge_port *br_port; 718 /* macvlan */ 719 struct macvlan_port *macvlan_port; 720 721 /* class/net/name entry */ 722 struct device dev; 723 /* space for optional statistics and wireless sysfs groups */ 724 struct attribute_group *sysfs_groups[3]; 725 726 /* rtnetlink link ops */ 727 const struct rtnl_link_ops *rtnl_link_ops; 728 729 /* The TX queue control structures */ 730 unsigned int egress_subqueue_count; 731 struct net_device_subqueue egress_subqueue[1]; 732 }; 733 #define to_net_dev(d) container_of(d, struct net_device, dev) 734 735 #define NETDEV_ALIGN 32 736 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1) 737 738 /** 739 * netdev_priv - access network device private data 740 * @dev: network device 741 * 742 * Get network device private data 743 */ 744 static inline void *netdev_priv(const struct net_device *dev) 745 { 746 return dev->priv; 747 } 748 749 /* Set the sysfs physical device reference for the network logical device 750 * if set prior to registration will cause a symlink during initialization. 751 */ 752 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) 753 754 /** 755 * netif_napi_add - initialize a napi context 756 * @dev: network device 757 * @napi: napi context 758 * @poll: polling function 759 * @weight: default weight 760 * 761 * netif_napi_add() must be used to initialize a napi context prior to calling 762 * *any* of the other napi related functions. 763 */ 764 static inline void netif_napi_add(struct net_device *dev, 765 struct napi_struct *napi, 766 int (*poll)(struct napi_struct *, int), 767 int weight) 768 { 769 INIT_LIST_HEAD(&napi->poll_list); 770 napi->poll = poll; 771 napi->weight = weight; 772 #ifdef CONFIG_NETPOLL 773 napi->dev = dev; 774 list_add(&napi->dev_list, &dev->napi_list); 775 spin_lock_init(&napi->poll_lock); 776 napi->poll_owner = -1; 777 #endif 778 set_bit(NAPI_STATE_SCHED, &napi->state); 779 } 780 781 struct packet_type { 782 __be16 type; /* This is really htons(ether_type). */ 783 struct net_device *dev; /* NULL is wildcarded here */ 784 int (*func) (struct sk_buff *, 785 struct net_device *, 786 struct packet_type *, 787 struct net_device *); 788 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 789 int features); 790 int (*gso_send_check)(struct sk_buff *skb); 791 void *af_packet_priv; 792 struct list_head list; 793 }; 794 795 #include <linux/interrupt.h> 796 #include <linux/notifier.h> 797 798 extern rwlock_t dev_base_lock; /* Device list lock */ 799 800 801 #define for_each_netdev(net, d) \ 802 list_for_each_entry(d, &(net)->dev_base_head, dev_list) 803 #define for_each_netdev_safe(net, d, n) \ 804 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list) 805 #define for_each_netdev_continue(net, d) \ 806 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list) 807 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) 808 809 static inline struct net_device *next_net_device(struct net_device *dev) 810 { 811 struct list_head *lh; 812 struct net *net; 813 814 net = dev->nd_net; 815 lh = dev->dev_list.next; 816 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 817 } 818 819 static inline struct net_device *first_net_device(struct net *net) 820 { 821 return list_empty(&net->dev_base_head) ? NULL : 822 net_device_entry(net->dev_base_head.next); 823 } 824 825 extern int netdev_boot_setup_check(struct net_device *dev); 826 extern unsigned long netdev_boot_base(const char *prefix, int unit); 827 extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr); 828 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type); 829 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type); 830 extern void dev_add_pack(struct packet_type *pt); 831 extern void dev_remove_pack(struct packet_type *pt); 832 extern void __dev_remove_pack(struct packet_type *pt); 833 834 extern struct net_device *dev_get_by_flags(struct net *net, unsigned short flags, 835 unsigned short mask); 836 extern struct net_device *dev_get_by_name(struct net *net, const char *name); 837 extern struct net_device *__dev_get_by_name(struct net *net, const char *name); 838 extern int dev_alloc_name(struct net_device *dev, const char *name); 839 extern int dev_open(struct net_device *dev); 840 extern int dev_close(struct net_device *dev); 841 extern int dev_queue_xmit(struct sk_buff *skb); 842 extern int register_netdevice(struct net_device *dev); 843 extern void unregister_netdevice(struct net_device *dev); 844 extern void free_netdev(struct net_device *dev); 845 extern void synchronize_net(void); 846 extern int register_netdevice_notifier(struct notifier_block *nb); 847 extern int unregister_netdevice_notifier(struct notifier_block *nb); 848 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev); 849 extern struct net_device *dev_get_by_index(struct net *net, int ifindex); 850 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex); 851 extern int dev_restart(struct net_device *dev); 852 #ifdef CONFIG_NETPOLL_TRAP 853 extern int netpoll_trap(void); 854 #endif 855 856 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, 857 unsigned short type, 858 const void *daddr, const void *saddr, 859 unsigned len) 860 { 861 if (!dev->header_ops || !dev->header_ops->create) 862 return 0; 863 864 return dev->header_ops->create(skb, dev, type, daddr, saddr, len); 865 } 866 867 static inline int dev_parse_header(const struct sk_buff *skb, 868 unsigned char *haddr) 869 { 870 const struct net_device *dev = skb->dev; 871 872 if (!dev->header_ops || !dev->header_ops->parse) 873 return 0; 874 return dev->header_ops->parse(skb, haddr); 875 } 876 877 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 878 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 879 static inline int unregister_gifconf(unsigned int family) 880 { 881 return register_gifconf(family, NULL); 882 } 883 884 /* 885 * Incoming packets are placed on per-cpu queues so that 886 * no locking is needed. 887 */ 888 struct softnet_data 889 { 890 struct net_device *output_queue; 891 struct sk_buff_head input_pkt_queue; 892 struct list_head poll_list; 893 struct sk_buff *completion_queue; 894 895 struct napi_struct backlog; 896 #ifdef CONFIG_NET_DMA 897 struct dma_chan *net_dma; 898 #endif 899 }; 900 901 DECLARE_PER_CPU(struct softnet_data,softnet_data); 902 903 #define HAVE_NETIF_QUEUE 904 905 extern void __netif_schedule(struct net_device *dev); 906 907 static inline void netif_schedule(struct net_device *dev) 908 { 909 if (!test_bit(__LINK_STATE_XOFF, &dev->state)) 910 __netif_schedule(dev); 911 } 912 913 /** 914 * netif_start_queue - allow transmit 915 * @dev: network device 916 * 917 * Allow upper layers to call the device hard_start_xmit routine. 918 */ 919 static inline void netif_start_queue(struct net_device *dev) 920 { 921 clear_bit(__LINK_STATE_XOFF, &dev->state); 922 } 923 924 /** 925 * netif_wake_queue - restart transmit 926 * @dev: network device 927 * 928 * Allow upper layers to call the device hard_start_xmit routine. 929 * Used for flow control when transmit resources are available. 930 */ 931 static inline void netif_wake_queue(struct net_device *dev) 932 { 933 #ifdef CONFIG_NETPOLL_TRAP 934 if (netpoll_trap()) { 935 clear_bit(__LINK_STATE_XOFF, &dev->state); 936 return; 937 } 938 #endif 939 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state)) 940 __netif_schedule(dev); 941 } 942 943 /** 944 * netif_stop_queue - stop transmitted packets 945 * @dev: network device 946 * 947 * Stop upper layers calling the device hard_start_xmit routine. 948 * Used for flow control when transmit resources are unavailable. 949 */ 950 static inline void netif_stop_queue(struct net_device *dev) 951 { 952 set_bit(__LINK_STATE_XOFF, &dev->state); 953 } 954 955 /** 956 * netif_queue_stopped - test if transmit queue is flowblocked 957 * @dev: network device 958 * 959 * Test if transmit queue on device is currently unable to send. 960 */ 961 static inline int netif_queue_stopped(const struct net_device *dev) 962 { 963 return test_bit(__LINK_STATE_XOFF, &dev->state); 964 } 965 966 /** 967 * netif_running - test if up 968 * @dev: network device 969 * 970 * Test if the device has been brought up. 971 */ 972 static inline int netif_running(const struct net_device *dev) 973 { 974 return test_bit(__LINK_STATE_START, &dev->state); 975 } 976 977 /* 978 * Routines to manage the subqueues on a device. We only need start 979 * stop, and a check if it's stopped. All other device management is 980 * done at the overall netdevice level. 981 * Also test the device if we're multiqueue. 982 */ 983 984 /** 985 * netif_start_subqueue - allow sending packets on subqueue 986 * @dev: network device 987 * @queue_index: sub queue index 988 * 989 * Start individual transmit queue of a device with multiple transmit queues. 990 */ 991 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 992 { 993 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 994 clear_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state); 995 #endif 996 } 997 998 /** 999 * netif_stop_subqueue - stop sending packets on subqueue 1000 * @dev: network device 1001 * @queue_index: sub queue index 1002 * 1003 * Stop individual transmit queue of a device with multiple transmit queues. 1004 */ 1005 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 1006 { 1007 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 1008 #ifdef CONFIG_NETPOLL_TRAP 1009 if (netpoll_trap()) 1010 return; 1011 #endif 1012 set_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state); 1013 #endif 1014 } 1015 1016 /** 1017 * netif_subqueue_stopped - test status of subqueue 1018 * @dev: network device 1019 * @queue_index: sub queue index 1020 * 1021 * Check individual transmit queue of a device with multiple transmit queues. 1022 */ 1023 static inline int __netif_subqueue_stopped(const struct net_device *dev, 1024 u16 queue_index) 1025 { 1026 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 1027 return test_bit(__LINK_STATE_XOFF, 1028 &dev->egress_subqueue[queue_index].state); 1029 #else 1030 return 0; 1031 #endif 1032 } 1033 1034 static inline int netif_subqueue_stopped(const struct net_device *dev, 1035 struct sk_buff *skb) 1036 { 1037 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb)); 1038 } 1039 1040 /** 1041 * netif_wake_subqueue - allow sending packets on subqueue 1042 * @dev: network device 1043 * @queue_index: sub queue index 1044 * 1045 * Resume individual transmit queue of a device with multiple transmit queues. 1046 */ 1047 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 1048 { 1049 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 1050 #ifdef CONFIG_NETPOLL_TRAP 1051 if (netpoll_trap()) 1052 return; 1053 #endif 1054 if (test_and_clear_bit(__LINK_STATE_XOFF, 1055 &dev->egress_subqueue[queue_index].state)) 1056 __netif_schedule(dev); 1057 #endif 1058 } 1059 1060 /** 1061 * netif_is_multiqueue - test if device has multiple transmit queues 1062 * @dev: network device 1063 * 1064 * Check if device has multiple transmit queues 1065 * Always falls if NETDEVICE_MULTIQUEUE is not configured 1066 */ 1067 static inline int netif_is_multiqueue(const struct net_device *dev) 1068 { 1069 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 1070 return (!!(NETIF_F_MULTI_QUEUE & dev->features)); 1071 #else 1072 return 0; 1073 #endif 1074 } 1075 1076 /* Use this variant when it is known for sure that it 1077 * is executing from hardware interrupt context or with hardware interrupts 1078 * disabled. 1079 */ 1080 extern void dev_kfree_skb_irq(struct sk_buff *skb); 1081 1082 /* Use this variant in places where it could be invoked 1083 * from either hardware interrupt or other context, with hardware interrupts 1084 * either disabled or enabled. 1085 */ 1086 extern void dev_kfree_skb_any(struct sk_buff *skb); 1087 1088 #define HAVE_NETIF_RX 1 1089 extern int netif_rx(struct sk_buff *skb); 1090 extern int netif_rx_ni(struct sk_buff *skb); 1091 #define HAVE_NETIF_RECEIVE_SKB 1 1092 extern int netif_receive_skb(struct sk_buff *skb); 1093 extern int dev_valid_name(const char *name); 1094 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *); 1095 extern int dev_ethtool(struct net *net, struct ifreq *); 1096 extern unsigned dev_get_flags(const struct net_device *); 1097 extern int dev_change_flags(struct net_device *, unsigned); 1098 extern int dev_change_name(struct net_device *, char *); 1099 extern int dev_change_net_namespace(struct net_device *, 1100 struct net *, const char *); 1101 extern int dev_set_mtu(struct net_device *, int); 1102 extern int dev_set_mac_address(struct net_device *, 1103 struct sockaddr *); 1104 extern int dev_hard_start_xmit(struct sk_buff *skb, 1105 struct net_device *dev); 1106 1107 extern int netdev_budget; 1108 1109 /* Called by rtnetlink.c:rtnl_unlock() */ 1110 extern void netdev_run_todo(void); 1111 1112 /** 1113 * dev_put - release reference to device 1114 * @dev: network device 1115 * 1116 * Release reference to device to allow it to be freed. 1117 */ 1118 static inline void dev_put(struct net_device *dev) 1119 { 1120 atomic_dec(&dev->refcnt); 1121 } 1122 1123 /** 1124 * dev_hold - get reference to device 1125 * @dev: network device 1126 * 1127 * Hold reference to device to keep it from being freed. 1128 */ 1129 static inline void dev_hold(struct net_device *dev) 1130 { 1131 atomic_inc(&dev->refcnt); 1132 } 1133 1134 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 1135 * and _off may be called from IRQ context, but it is caller 1136 * who is responsible for serialization of these calls. 1137 * 1138 * The name carrier is inappropriate, these functions should really be 1139 * called netif_lowerlayer_*() because they represent the state of any 1140 * kind of lower layer not just hardware media. 1141 */ 1142 1143 extern void linkwatch_fire_event(struct net_device *dev); 1144 1145 /** 1146 * netif_carrier_ok - test if carrier present 1147 * @dev: network device 1148 * 1149 * Check if carrier is present on device 1150 */ 1151 static inline int netif_carrier_ok(const struct net_device *dev) 1152 { 1153 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 1154 } 1155 1156 extern void __netdev_watchdog_up(struct net_device *dev); 1157 1158 extern void netif_carrier_on(struct net_device *dev); 1159 1160 extern void netif_carrier_off(struct net_device *dev); 1161 1162 /** 1163 * netif_dormant_on - mark device as dormant. 1164 * @dev: network device 1165 * 1166 * Mark device as dormant (as per RFC2863). 1167 * 1168 * The dormant state indicates that the relevant interface is not 1169 * actually in a condition to pass packets (i.e., it is not 'up') but is 1170 * in a "pending" state, waiting for some external event. For "on- 1171 * demand" interfaces, this new state identifies the situation where the 1172 * interface is waiting for events to place it in the up state. 1173 * 1174 */ 1175 static inline void netif_dormant_on(struct net_device *dev) 1176 { 1177 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 1178 linkwatch_fire_event(dev); 1179 } 1180 1181 /** 1182 * netif_dormant_off - set device as not dormant. 1183 * @dev: network device 1184 * 1185 * Device is not in dormant state. 1186 */ 1187 static inline void netif_dormant_off(struct net_device *dev) 1188 { 1189 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 1190 linkwatch_fire_event(dev); 1191 } 1192 1193 /** 1194 * netif_dormant - test if carrier present 1195 * @dev: network device 1196 * 1197 * Check if carrier is present on device 1198 */ 1199 static inline int netif_dormant(const struct net_device *dev) 1200 { 1201 return test_bit(__LINK_STATE_DORMANT, &dev->state); 1202 } 1203 1204 1205 /** 1206 * netif_oper_up - test if device is operational 1207 * @dev: network device 1208 * 1209 * Check if carrier is operational 1210 */ 1211 static inline int netif_oper_up(const struct net_device *dev) { 1212 return (dev->operstate == IF_OPER_UP || 1213 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 1214 } 1215 1216 /** 1217 * netif_device_present - is device available or removed 1218 * @dev: network device 1219 * 1220 * Check if device has not been removed from system. 1221 */ 1222 static inline int netif_device_present(struct net_device *dev) 1223 { 1224 return test_bit(__LINK_STATE_PRESENT, &dev->state); 1225 } 1226 1227 extern void netif_device_detach(struct net_device *dev); 1228 1229 extern void netif_device_attach(struct net_device *dev); 1230 1231 /* 1232 * Network interface message level settings 1233 */ 1234 #define HAVE_NETIF_MSG 1 1235 1236 enum { 1237 NETIF_MSG_DRV = 0x0001, 1238 NETIF_MSG_PROBE = 0x0002, 1239 NETIF_MSG_LINK = 0x0004, 1240 NETIF_MSG_TIMER = 0x0008, 1241 NETIF_MSG_IFDOWN = 0x0010, 1242 NETIF_MSG_IFUP = 0x0020, 1243 NETIF_MSG_RX_ERR = 0x0040, 1244 NETIF_MSG_TX_ERR = 0x0080, 1245 NETIF_MSG_TX_QUEUED = 0x0100, 1246 NETIF_MSG_INTR = 0x0200, 1247 NETIF_MSG_TX_DONE = 0x0400, 1248 NETIF_MSG_RX_STATUS = 0x0800, 1249 NETIF_MSG_PKTDATA = 0x1000, 1250 NETIF_MSG_HW = 0x2000, 1251 NETIF_MSG_WOL = 0x4000, 1252 }; 1253 1254 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 1255 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 1256 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 1257 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 1258 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 1259 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 1260 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 1261 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 1262 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 1263 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 1264 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 1265 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 1266 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 1267 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 1268 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 1269 1270 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 1271 { 1272 /* use default */ 1273 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 1274 return default_msg_enable_bits; 1275 if (debug_value == 0) /* no output */ 1276 return 0; 1277 /* set low N bits */ 1278 return (1 << debug_value) - 1; 1279 } 1280 1281 /* Test if receive needs to be scheduled but only if up */ 1282 static inline int netif_rx_schedule_prep(struct net_device *dev, 1283 struct napi_struct *napi) 1284 { 1285 return napi_schedule_prep(napi); 1286 } 1287 1288 /* Add interface to tail of rx poll list. This assumes that _prep has 1289 * already been called and returned 1. 1290 */ 1291 static inline void __netif_rx_schedule(struct net_device *dev, 1292 struct napi_struct *napi) 1293 { 1294 __napi_schedule(napi); 1295 } 1296 1297 /* Try to reschedule poll. Called by irq handler. */ 1298 1299 static inline void netif_rx_schedule(struct net_device *dev, 1300 struct napi_struct *napi) 1301 { 1302 if (netif_rx_schedule_prep(dev, napi)) 1303 __netif_rx_schedule(dev, napi); 1304 } 1305 1306 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). */ 1307 static inline int netif_rx_reschedule(struct net_device *dev, 1308 struct napi_struct *napi) 1309 { 1310 if (napi_schedule_prep(napi)) { 1311 __netif_rx_schedule(dev, napi); 1312 return 1; 1313 } 1314 return 0; 1315 } 1316 1317 /* same as netif_rx_complete, except that local_irq_save(flags) 1318 * has already been issued 1319 */ 1320 static inline void __netif_rx_complete(struct net_device *dev, 1321 struct napi_struct *napi) 1322 { 1323 __napi_complete(napi); 1324 } 1325 1326 /* Remove interface from poll list: it must be in the poll list 1327 * on current cpu. This primitive is called by dev->poll(), when 1328 * it completes the work. The device cannot be out of poll list at this 1329 * moment, it is BUG(). 1330 */ 1331 static inline void netif_rx_complete(struct net_device *dev, 1332 struct napi_struct *napi) 1333 { 1334 unsigned long flags; 1335 1336 local_irq_save(flags); 1337 __netif_rx_complete(dev, napi); 1338 local_irq_restore(flags); 1339 } 1340 1341 /** 1342 * netif_tx_lock - grab network device transmit lock 1343 * @dev: network device 1344 * @cpu: cpu number of lock owner 1345 * 1346 * Get network device transmit lock 1347 */ 1348 static inline void __netif_tx_lock(struct net_device *dev, int cpu) 1349 { 1350 spin_lock(&dev->_xmit_lock); 1351 dev->xmit_lock_owner = cpu; 1352 } 1353 1354 static inline void netif_tx_lock(struct net_device *dev) 1355 { 1356 __netif_tx_lock(dev, smp_processor_id()); 1357 } 1358 1359 static inline void netif_tx_lock_bh(struct net_device *dev) 1360 { 1361 spin_lock_bh(&dev->_xmit_lock); 1362 dev->xmit_lock_owner = smp_processor_id(); 1363 } 1364 1365 static inline int netif_tx_trylock(struct net_device *dev) 1366 { 1367 int ok = spin_trylock(&dev->_xmit_lock); 1368 if (likely(ok)) 1369 dev->xmit_lock_owner = smp_processor_id(); 1370 return ok; 1371 } 1372 1373 static inline void netif_tx_unlock(struct net_device *dev) 1374 { 1375 dev->xmit_lock_owner = -1; 1376 spin_unlock(&dev->_xmit_lock); 1377 } 1378 1379 static inline void netif_tx_unlock_bh(struct net_device *dev) 1380 { 1381 dev->xmit_lock_owner = -1; 1382 spin_unlock_bh(&dev->_xmit_lock); 1383 } 1384 1385 #define HARD_TX_LOCK(dev, cpu) { \ 1386 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1387 __netif_tx_lock(dev, cpu); \ 1388 } \ 1389 } 1390 1391 #define HARD_TX_UNLOCK(dev) { \ 1392 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1393 netif_tx_unlock(dev); \ 1394 } \ 1395 } 1396 1397 static inline void netif_tx_disable(struct net_device *dev) 1398 { 1399 netif_tx_lock_bh(dev); 1400 netif_stop_queue(dev); 1401 netif_tx_unlock_bh(dev); 1402 } 1403 1404 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 1405 1406 extern void ether_setup(struct net_device *dev); 1407 1408 /* Support for loadable net-drivers */ 1409 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, 1410 void (*setup)(struct net_device *), 1411 unsigned int queue_count); 1412 #define alloc_netdev(sizeof_priv, name, setup) \ 1413 alloc_netdev_mq(sizeof_priv, name, setup, 1) 1414 extern int register_netdev(struct net_device *dev); 1415 extern void unregister_netdev(struct net_device *dev); 1416 /* Functions used for secondary unicast and multicast support */ 1417 extern void dev_set_rx_mode(struct net_device *dev); 1418 extern void __dev_set_rx_mode(struct net_device *dev); 1419 extern int dev_unicast_delete(struct net_device *dev, void *addr, int alen); 1420 extern int dev_unicast_add(struct net_device *dev, void *addr, int alen); 1421 extern int dev_unicast_sync(struct net_device *to, struct net_device *from); 1422 extern void dev_unicast_unsync(struct net_device *to, struct net_device *from); 1423 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all); 1424 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly); 1425 extern int dev_mc_sync(struct net_device *to, struct net_device *from); 1426 extern void dev_mc_unsync(struct net_device *to, struct net_device *from); 1427 extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all); 1428 extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly); 1429 extern int __dev_addr_sync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count); 1430 extern void __dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count); 1431 extern void dev_set_promiscuity(struct net_device *dev, int inc); 1432 extern void dev_set_allmulti(struct net_device *dev, int inc); 1433 extern void netdev_state_change(struct net_device *dev); 1434 extern void netdev_features_change(struct net_device *dev); 1435 /* Load a device via the kmod */ 1436 extern void dev_load(struct net *net, const char *name); 1437 extern void dev_mcast_init(void); 1438 extern int netdev_max_backlog; 1439 extern int weight_p; 1440 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 1441 extern int skb_checksum_help(struct sk_buff *skb); 1442 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features); 1443 #ifdef CONFIG_BUG 1444 extern void netdev_rx_csum_fault(struct net_device *dev); 1445 #else 1446 static inline void netdev_rx_csum_fault(struct net_device *dev) 1447 { 1448 } 1449 #endif 1450 /* rx skb timestamps */ 1451 extern void net_enable_timestamp(void); 1452 extern void net_disable_timestamp(void); 1453 1454 #ifdef CONFIG_PROC_FS 1455 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 1456 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 1457 extern void dev_seq_stop(struct seq_file *seq, void *v); 1458 #endif 1459 1460 extern void linkwatch_run_queue(void); 1461 1462 extern int netdev_compute_features(unsigned long all, unsigned long one); 1463 1464 static inline int net_gso_ok(int features, int gso_type) 1465 { 1466 int feature = gso_type << NETIF_F_GSO_SHIFT; 1467 return (features & feature) == feature; 1468 } 1469 1470 static inline int skb_gso_ok(struct sk_buff *skb, int features) 1471 { 1472 return net_gso_ok(features, skb_shinfo(skb)->gso_type); 1473 } 1474 1475 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb) 1476 { 1477 return skb_is_gso(skb) && 1478 (!skb_gso_ok(skb, dev->features) || 1479 unlikely(skb->ip_summed != CHECKSUM_PARTIAL)); 1480 } 1481 1482 /* On bonding slaves other than the currently active slave, suppress 1483 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and 1484 * ARP on active-backup slaves with arp_validate enabled. 1485 */ 1486 static inline int skb_bond_should_drop(struct sk_buff *skb) 1487 { 1488 struct net_device *dev = skb->dev; 1489 struct net_device *master = dev->master; 1490 1491 if (master && 1492 (dev->priv_flags & IFF_SLAVE_INACTIVE)) { 1493 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) && 1494 skb->protocol == __constant_htons(ETH_P_ARP)) 1495 return 0; 1496 1497 if (master->priv_flags & IFF_MASTER_ALB) { 1498 if (skb->pkt_type != PACKET_BROADCAST && 1499 skb->pkt_type != PACKET_MULTICAST) 1500 return 0; 1501 } 1502 if (master->priv_flags & IFF_MASTER_8023AD && 1503 skb->protocol == __constant_htons(ETH_P_SLOW)) 1504 return 0; 1505 1506 return 1; 1507 } 1508 return 0; 1509 } 1510 1511 #endif /* __KERNEL__ */ 1512 1513 #endif /* _LINUX_DEV_H */ 1514