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 }; 323 324 extern void FASTCALL(__napi_schedule(struct napi_struct *n)); 325 326 /** 327 * napi_schedule_prep - check if napi can be scheduled 328 * @n: napi context 329 * 330 * Test if NAPI routine is already running, and if not mark 331 * it as running. This is used as a condition variable 332 * insure only one NAPI poll instance runs 333 */ 334 static inline int napi_schedule_prep(struct napi_struct *n) 335 { 336 return !test_and_set_bit(NAPI_STATE_SCHED, &n->state); 337 } 338 339 /** 340 * napi_schedule - schedule NAPI poll 341 * @n: napi context 342 * 343 * Schedule NAPI poll routine to be called if it is not already 344 * running. 345 */ 346 static inline void napi_schedule(struct napi_struct *n) 347 { 348 if (napi_schedule_prep(n)) 349 __napi_schedule(n); 350 } 351 352 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */ 353 static inline int napi_reschedule(struct napi_struct *napi) 354 { 355 if (napi_schedule_prep(napi)) { 356 __napi_schedule(napi); 357 return 1; 358 } 359 return 0; 360 } 361 362 /** 363 * napi_complete - NAPI processing complete 364 * @n: napi context 365 * 366 * Mark NAPI processing as complete. 367 */ 368 static inline void __napi_complete(struct napi_struct *n) 369 { 370 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); 371 list_del(&n->poll_list); 372 smp_mb__before_clear_bit(); 373 clear_bit(NAPI_STATE_SCHED, &n->state); 374 } 375 376 static inline void napi_complete(struct napi_struct *n) 377 { 378 local_irq_disable(); 379 __napi_complete(n); 380 local_irq_enable(); 381 } 382 383 /** 384 * napi_disable - prevent NAPI from scheduling 385 * @n: napi context 386 * 387 * Stop NAPI from being scheduled on this context. 388 * Waits till any outstanding processing completes. 389 */ 390 static inline void napi_disable(struct napi_struct *n) 391 { 392 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state)) 393 msleep(1); 394 } 395 396 /** 397 * napi_enable - enable NAPI scheduling 398 * @n: napi context 399 * 400 * Resume NAPI from being scheduled on this context. 401 * Must be paired with napi_disable. 402 */ 403 static inline void napi_enable(struct napi_struct *n) 404 { 405 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); 406 smp_mb__before_clear_bit(); 407 clear_bit(NAPI_STATE_SCHED, &n->state); 408 } 409 410 #ifdef CONFIG_SMP 411 /** 412 * napi_synchronize - wait until NAPI is not running 413 * @n: napi context 414 * 415 * Wait until NAPI is done being scheduled on this context. 416 * Waits till any outstanding processing completes but 417 * does not disable future activations. 418 */ 419 static inline void napi_synchronize(const struct napi_struct *n) 420 { 421 while (test_bit(NAPI_STATE_SCHED, &n->state)) 422 msleep(1); 423 } 424 #else 425 # define napi_synchronize(n) barrier() 426 #endif 427 428 /* 429 * The DEVICE structure. 430 * Actually, this whole structure is a big mistake. It mixes I/O 431 * data with strictly "high-level" data, and it has to know about 432 * almost every data structure used in the INET module. 433 * 434 * FIXME: cleanup struct net_device such that network protocol info 435 * moves out. 436 */ 437 438 struct net_device 439 { 440 441 /* 442 * This is the first field of the "visible" part of this structure 443 * (i.e. as seen by users in the "Space.c" file). It is the name 444 * the interface. 445 */ 446 char name[IFNAMSIZ]; 447 /* device name hash chain */ 448 struct hlist_node name_hlist; 449 450 /* 451 * I/O specific fields 452 * FIXME: Merge these and struct ifmap into one 453 */ 454 unsigned long mem_end; /* shared mem end */ 455 unsigned long mem_start; /* shared mem start */ 456 unsigned long base_addr; /* device I/O address */ 457 unsigned int irq; /* device IRQ number */ 458 459 /* 460 * Some hardware also needs these fields, but they are not 461 * part of the usual set specified in Space.c. 462 */ 463 464 unsigned char if_port; /* Selectable AUI, TP,..*/ 465 unsigned char dma; /* DMA channel */ 466 467 unsigned long state; 468 469 struct list_head dev_list; 470 #ifdef CONFIG_NETPOLL 471 struct list_head napi_list; 472 #endif 473 474 /* The device initialization function. Called only once. */ 475 int (*init)(struct net_device *dev); 476 477 /* ------- Fields preinitialized in Space.c finish here ------- */ 478 479 /* Net device features */ 480 unsigned long features; 481 #define NETIF_F_SG 1 /* Scatter/gather IO. */ 482 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */ 483 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ 484 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ 485 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */ 486 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ 487 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ 488 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ 489 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ 490 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ 491 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ 492 #define NETIF_F_GSO 2048 /* Enable software GSO. */ 493 #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */ 494 /* do not use LLTX in new drivers */ 495 #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */ 496 #define NETIF_F_MULTI_QUEUE 16384 /* Has multiple TX/RX queues */ 497 #define NETIF_F_LRO 32768 /* large receive offload */ 498 499 /* Segmentation offload features */ 500 #define NETIF_F_GSO_SHIFT 16 501 #define NETIF_F_GSO_MASK 0xffff0000 502 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT) 503 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT) 504 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT) 505 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT) 506 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT) 507 508 /* List of features with software fallbacks. */ 509 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6) 510 511 512 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM) 513 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM) 514 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM) 515 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM) 516 517 struct net_device *next_sched; 518 519 /* Interface index. Unique device identifier */ 520 int ifindex; 521 int iflink; 522 523 524 struct net_device_stats* (*get_stats)(struct net_device *dev); 525 struct net_device_stats stats; 526 527 #ifdef CONFIG_WIRELESS_EXT 528 /* List of functions to handle Wireless Extensions (instead of ioctl). 529 * See <net/iw_handler.h> for details. Jean II */ 530 const struct iw_handler_def * wireless_handlers; 531 /* Instance data managed by the core of Wireless Extensions. */ 532 struct iw_public_data * wireless_data; 533 #endif 534 const struct ethtool_ops *ethtool_ops; 535 536 /* Hardware header description */ 537 const struct header_ops *header_ops; 538 539 /* 540 * This marks the end of the "visible" part of the structure. All 541 * fields hereafter are internal to the system, and may change at 542 * will (read: may be cleaned up at will). 543 */ 544 545 546 unsigned int flags; /* interface flags (a la BSD) */ 547 unsigned short gflags; 548 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ 549 unsigned short padded; /* How much padding added by alloc_netdev() */ 550 551 unsigned char operstate; /* RFC2863 operstate */ 552 unsigned char link_mode; /* mapping policy to operstate */ 553 554 unsigned mtu; /* interface MTU value */ 555 unsigned short type; /* interface hardware type */ 556 unsigned short hard_header_len; /* hardware hdr length */ 557 558 struct net_device *master; /* Pointer to master device of a group, 559 * which this device is member of. 560 */ 561 562 /* Interface address info. */ 563 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ 564 unsigned char addr_len; /* hardware address length */ 565 unsigned short dev_id; /* for shared network cards */ 566 567 struct dev_addr_list *uc_list; /* Secondary unicast mac addresses */ 568 int uc_count; /* Number of installed ucasts */ 569 int uc_promisc; 570 struct dev_addr_list *mc_list; /* Multicast mac addresses */ 571 int mc_count; /* Number of installed mcasts */ 572 int promiscuity; 573 int allmulti; 574 575 576 /* Protocol specific pointers */ 577 578 void *atalk_ptr; /* AppleTalk link */ 579 void *ip_ptr; /* IPv4 specific data */ 580 void *dn_ptr; /* DECnet specific data */ 581 void *ip6_ptr; /* IPv6 specific data */ 582 void *ec_ptr; /* Econet specific data */ 583 void *ax25_ptr; /* AX.25 specific data */ 584 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data, 585 assign before registering */ 586 587 /* 588 * Cache line mostly used on receive path (including eth_type_trans()) 589 */ 590 unsigned long last_rx; /* Time of last Rx */ 591 /* Interface address info used in eth_type_trans() */ 592 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast 593 because most packets are unicast) */ 594 595 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 596 597 /* 598 * Cache line mostly used on queue transmit path (qdisc) 599 */ 600 /* device queue lock */ 601 spinlock_t queue_lock ____cacheline_aligned_in_smp; 602 struct Qdisc *qdisc; 603 struct Qdisc *qdisc_sleeping; 604 struct list_head qdisc_list; 605 unsigned long tx_queue_len; /* Max frames per queue allowed */ 606 607 /* Partially transmitted GSO packet. */ 608 struct sk_buff *gso_skb; 609 610 /* ingress path synchronizer */ 611 spinlock_t ingress_lock; 612 struct Qdisc *qdisc_ingress; 613 614 /* 615 * One part is mostly used on xmit path (device) 616 */ 617 /* hard_start_xmit synchronizer */ 618 spinlock_t _xmit_lock ____cacheline_aligned_in_smp; 619 /* cpu id of processor entered to hard_start_xmit or -1, 620 if nobody entered there. 621 */ 622 int xmit_lock_owner; 623 void *priv; /* pointer to private data */ 624 int (*hard_start_xmit) (struct sk_buff *skb, 625 struct net_device *dev); 626 /* These may be needed for future network-power-down code. */ 627 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 628 629 int watchdog_timeo; /* used by dev_watchdog() */ 630 struct timer_list watchdog_timer; 631 632 /* 633 * refcnt is a very hot point, so align it on SMP 634 */ 635 /* Number of references to this device */ 636 atomic_t refcnt ____cacheline_aligned_in_smp; 637 638 /* delayed register/unregister */ 639 struct list_head todo_list; 640 /* device index hash chain */ 641 struct hlist_node index_hlist; 642 643 struct net_device *link_watch_next; 644 645 /* register/unregister state machine */ 646 enum { NETREG_UNINITIALIZED=0, 647 NETREG_REGISTERED, /* completed register_netdevice */ 648 NETREG_UNREGISTERING, /* called unregister_netdevice */ 649 NETREG_UNREGISTERED, /* completed unregister todo */ 650 NETREG_RELEASED, /* called free_netdev */ 651 } reg_state; 652 653 /* Called after device is detached from network. */ 654 void (*uninit)(struct net_device *dev); 655 /* Called after last user reference disappears. */ 656 void (*destructor)(struct net_device *dev); 657 658 /* Pointers to interface service routines. */ 659 int (*open)(struct net_device *dev); 660 int (*stop)(struct net_device *dev); 661 #define HAVE_NETDEV_POLL 662 #define HAVE_CHANGE_RX_FLAGS 663 void (*change_rx_flags)(struct net_device *dev, 664 int flags); 665 #define HAVE_SET_RX_MODE 666 void (*set_rx_mode)(struct net_device *dev); 667 #define HAVE_MULTICAST 668 void (*set_multicast_list)(struct net_device *dev); 669 #define HAVE_SET_MAC_ADDR 670 int (*set_mac_address)(struct net_device *dev, 671 void *addr); 672 #define HAVE_VALIDATE_ADDR 673 int (*validate_addr)(struct net_device *dev); 674 #define HAVE_PRIVATE_IOCTL 675 int (*do_ioctl)(struct net_device *dev, 676 struct ifreq *ifr, int cmd); 677 #define HAVE_SET_CONFIG 678 int (*set_config)(struct net_device *dev, 679 struct ifmap *map); 680 #define HAVE_CHANGE_MTU 681 int (*change_mtu)(struct net_device *dev, int new_mtu); 682 683 #define HAVE_TX_TIMEOUT 684 void (*tx_timeout) (struct net_device *dev); 685 686 void (*vlan_rx_register)(struct net_device *dev, 687 struct vlan_group *grp); 688 void (*vlan_rx_add_vid)(struct net_device *dev, 689 unsigned short vid); 690 void (*vlan_rx_kill_vid)(struct net_device *dev, 691 unsigned short vid); 692 693 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *); 694 #ifdef CONFIG_NETPOLL 695 struct netpoll_info *npinfo; 696 #endif 697 #ifdef CONFIG_NET_POLL_CONTROLLER 698 void (*poll_controller)(struct net_device *dev); 699 #endif 700 701 /* Network namespace this network device is inside */ 702 struct net *nd_net; 703 704 /* bridge stuff */ 705 struct net_bridge_port *br_port; 706 /* macvlan */ 707 struct macvlan_port *macvlan_port; 708 709 /* class/net/name entry */ 710 struct device dev; 711 /* space for optional statistics and wireless sysfs groups */ 712 struct attribute_group *sysfs_groups[3]; 713 714 /* rtnetlink link ops */ 715 const struct rtnl_link_ops *rtnl_link_ops; 716 717 /* The TX queue control structures */ 718 unsigned int egress_subqueue_count; 719 struct net_device_subqueue egress_subqueue[1]; 720 }; 721 #define to_net_dev(d) container_of(d, struct net_device, dev) 722 723 #define NETDEV_ALIGN 32 724 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1) 725 726 /** 727 * netdev_priv - access network device private data 728 * @dev: network device 729 * 730 * Get network device private data 731 */ 732 static inline void *netdev_priv(const struct net_device *dev) 733 { 734 return dev->priv; 735 } 736 737 /* Set the sysfs physical device reference for the network logical device 738 * if set prior to registration will cause a symlink during initialization. 739 */ 740 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) 741 742 /** 743 * netif_napi_add - initialize a napi context 744 * @dev: network device 745 * @napi: napi context 746 * @poll: polling function 747 * @weight: default weight 748 * 749 * netif_napi_add() must be used to initialize a napi context prior to calling 750 * *any* of the other napi related functions. 751 */ 752 static inline void netif_napi_add(struct net_device *dev, 753 struct napi_struct *napi, 754 int (*poll)(struct napi_struct *, int), 755 int weight) 756 { 757 INIT_LIST_HEAD(&napi->poll_list); 758 napi->poll = poll; 759 napi->weight = weight; 760 #ifdef CONFIG_NETPOLL 761 napi->dev = dev; 762 list_add(&napi->dev_list, &dev->napi_list); 763 spin_lock_init(&napi->poll_lock); 764 napi->poll_owner = -1; 765 #endif 766 set_bit(NAPI_STATE_SCHED, &napi->state); 767 } 768 769 struct packet_type { 770 __be16 type; /* This is really htons(ether_type). */ 771 struct net_device *dev; /* NULL is wildcarded here */ 772 int (*func) (struct sk_buff *, 773 struct net_device *, 774 struct packet_type *, 775 struct net_device *); 776 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 777 int features); 778 int (*gso_send_check)(struct sk_buff *skb); 779 void *af_packet_priv; 780 struct list_head list; 781 }; 782 783 #include <linux/interrupt.h> 784 #include <linux/notifier.h> 785 786 extern rwlock_t dev_base_lock; /* Device list lock */ 787 788 789 #define for_each_netdev(net, d) \ 790 list_for_each_entry(d, &(net)->dev_base_head, dev_list) 791 #define for_each_netdev_safe(net, d, n) \ 792 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list) 793 #define for_each_netdev_continue(net, d) \ 794 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list) 795 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) 796 797 static inline struct net_device *next_net_device(struct net_device *dev) 798 { 799 struct list_head *lh; 800 struct net *net; 801 802 net = dev->nd_net; 803 lh = dev->dev_list.next; 804 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 805 } 806 807 static inline struct net_device *first_net_device(struct net *net) 808 { 809 return list_empty(&net->dev_base_head) ? NULL : 810 net_device_entry(net->dev_base_head.next); 811 } 812 813 extern int netdev_boot_setup_check(struct net_device *dev); 814 extern unsigned long netdev_boot_base(const char *prefix, int unit); 815 extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr); 816 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type); 817 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type); 818 extern void dev_add_pack(struct packet_type *pt); 819 extern void dev_remove_pack(struct packet_type *pt); 820 extern void __dev_remove_pack(struct packet_type *pt); 821 822 extern struct net_device *dev_get_by_flags(struct net *net, unsigned short flags, 823 unsigned short mask); 824 extern struct net_device *dev_get_by_name(struct net *net, const char *name); 825 extern struct net_device *__dev_get_by_name(struct net *net, const char *name); 826 extern int dev_alloc_name(struct net_device *dev, const char *name); 827 extern int dev_open(struct net_device *dev); 828 extern int dev_close(struct net_device *dev); 829 extern int dev_queue_xmit(struct sk_buff *skb); 830 extern int register_netdevice(struct net_device *dev); 831 extern void unregister_netdevice(struct net_device *dev); 832 extern void free_netdev(struct net_device *dev); 833 extern void synchronize_net(void); 834 extern int register_netdevice_notifier(struct notifier_block *nb); 835 extern int unregister_netdevice_notifier(struct notifier_block *nb); 836 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev); 837 extern struct net_device *dev_get_by_index(struct net *net, int ifindex); 838 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex); 839 extern int dev_restart(struct net_device *dev); 840 #ifdef CONFIG_NETPOLL_TRAP 841 extern int netpoll_trap(void); 842 #endif 843 844 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, 845 unsigned short type, 846 const void *daddr, const void *saddr, 847 unsigned len) 848 { 849 if (!dev->header_ops || !dev->header_ops->create) 850 return 0; 851 852 return dev->header_ops->create(skb, dev, type, daddr, saddr, len); 853 } 854 855 static inline int dev_parse_header(const struct sk_buff *skb, 856 unsigned char *haddr) 857 { 858 const struct net_device *dev = skb->dev; 859 860 if (!dev->header_ops || !dev->header_ops->parse) 861 return 0; 862 return dev->header_ops->parse(skb, haddr); 863 } 864 865 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 866 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 867 static inline int unregister_gifconf(unsigned int family) 868 { 869 return register_gifconf(family, NULL); 870 } 871 872 /* 873 * Incoming packets are placed on per-cpu queues so that 874 * no locking is needed. 875 */ 876 struct softnet_data 877 { 878 struct net_device *output_queue; 879 struct sk_buff_head input_pkt_queue; 880 struct list_head poll_list; 881 struct sk_buff *completion_queue; 882 883 struct napi_struct backlog; 884 #ifdef CONFIG_NET_DMA 885 struct dma_chan *net_dma; 886 #endif 887 }; 888 889 DECLARE_PER_CPU(struct softnet_data,softnet_data); 890 891 #define HAVE_NETIF_QUEUE 892 893 extern void __netif_schedule(struct net_device *dev); 894 895 static inline void netif_schedule(struct net_device *dev) 896 { 897 if (!test_bit(__LINK_STATE_XOFF, &dev->state)) 898 __netif_schedule(dev); 899 } 900 901 /** 902 * netif_start_queue - allow transmit 903 * @dev: network device 904 * 905 * Allow upper layers to call the device hard_start_xmit routine. 906 */ 907 static inline void netif_start_queue(struct net_device *dev) 908 { 909 clear_bit(__LINK_STATE_XOFF, &dev->state); 910 } 911 912 /** 913 * netif_wake_queue - restart transmit 914 * @dev: network device 915 * 916 * Allow upper layers to call the device hard_start_xmit routine. 917 * Used for flow control when transmit resources are available. 918 */ 919 static inline void netif_wake_queue(struct net_device *dev) 920 { 921 #ifdef CONFIG_NETPOLL_TRAP 922 if (netpoll_trap()) { 923 clear_bit(__LINK_STATE_XOFF, &dev->state); 924 return; 925 } 926 #endif 927 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state)) 928 __netif_schedule(dev); 929 } 930 931 /** 932 * netif_stop_queue - stop transmitted packets 933 * @dev: network device 934 * 935 * Stop upper layers calling the device hard_start_xmit routine. 936 * Used for flow control when transmit resources are unavailable. 937 */ 938 static inline void netif_stop_queue(struct net_device *dev) 939 { 940 set_bit(__LINK_STATE_XOFF, &dev->state); 941 } 942 943 /** 944 * netif_queue_stopped - test if transmit queue is flowblocked 945 * @dev: network device 946 * 947 * Test if transmit queue on device is currently unable to send. 948 */ 949 static inline int netif_queue_stopped(const struct net_device *dev) 950 { 951 return test_bit(__LINK_STATE_XOFF, &dev->state); 952 } 953 954 /** 955 * netif_running - test if up 956 * @dev: network device 957 * 958 * Test if the device has been brought up. 959 */ 960 static inline int netif_running(const struct net_device *dev) 961 { 962 return test_bit(__LINK_STATE_START, &dev->state); 963 } 964 965 /* 966 * Routines to manage the subqueues on a device. We only need start 967 * stop, and a check if it's stopped. All other device management is 968 * done at the overall netdevice level. 969 * Also test the device if we're multiqueue. 970 */ 971 972 /** 973 * netif_start_subqueue - allow sending packets on subqueue 974 * @dev: network device 975 * @queue_index: sub queue index 976 * 977 * Start individual transmit queue of a device with multiple transmit queues. 978 */ 979 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 980 { 981 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 982 clear_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state); 983 #endif 984 } 985 986 /** 987 * netif_stop_subqueue - stop sending packets on subqueue 988 * @dev: network device 989 * @queue_index: sub queue index 990 * 991 * Stop individual transmit queue of a device with multiple transmit queues. 992 */ 993 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 994 { 995 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 996 #ifdef CONFIG_NETPOLL_TRAP 997 if (netpoll_trap()) 998 return; 999 #endif 1000 set_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state); 1001 #endif 1002 } 1003 1004 /** 1005 * netif_subqueue_stopped - test status of subqueue 1006 * @dev: network device 1007 * @queue_index: sub queue index 1008 * 1009 * Check individual transmit queue of a device with multiple transmit queues. 1010 */ 1011 static inline int __netif_subqueue_stopped(const struct net_device *dev, 1012 u16 queue_index) 1013 { 1014 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 1015 return test_bit(__LINK_STATE_XOFF, 1016 &dev->egress_subqueue[queue_index].state); 1017 #else 1018 return 0; 1019 #endif 1020 } 1021 1022 static inline int netif_subqueue_stopped(const struct net_device *dev, 1023 struct sk_buff *skb) 1024 { 1025 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb)); 1026 } 1027 1028 /** 1029 * netif_wake_subqueue - allow sending packets on subqueue 1030 * @dev: network device 1031 * @queue_index: sub queue index 1032 * 1033 * Resume individual transmit queue of a device with multiple transmit queues. 1034 */ 1035 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 1036 { 1037 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 1038 #ifdef CONFIG_NETPOLL_TRAP 1039 if (netpoll_trap()) 1040 return; 1041 #endif 1042 if (test_and_clear_bit(__LINK_STATE_XOFF, 1043 &dev->egress_subqueue[queue_index].state)) 1044 __netif_schedule(dev); 1045 #endif 1046 } 1047 1048 /** 1049 * netif_is_multiqueue - test if device has multiple transmit queues 1050 * @dev: network device 1051 * 1052 * Check if device has multiple transmit queues 1053 * Always falls if NETDEVICE_MULTIQUEUE is not configured 1054 */ 1055 static inline int netif_is_multiqueue(const struct net_device *dev) 1056 { 1057 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 1058 return (!!(NETIF_F_MULTI_QUEUE & dev->features)); 1059 #else 1060 return 0; 1061 #endif 1062 } 1063 1064 /* Use this variant when it is known for sure that it 1065 * is executing from interrupt context. 1066 */ 1067 extern void dev_kfree_skb_irq(struct sk_buff *skb); 1068 1069 /* Use this variant in places where it could be invoked 1070 * either from interrupt or non-interrupt context. 1071 */ 1072 extern void dev_kfree_skb_any(struct sk_buff *skb); 1073 1074 #define HAVE_NETIF_RX 1 1075 extern int netif_rx(struct sk_buff *skb); 1076 extern int netif_rx_ni(struct sk_buff *skb); 1077 #define HAVE_NETIF_RECEIVE_SKB 1 1078 extern int netif_receive_skb(struct sk_buff *skb); 1079 extern int dev_valid_name(const char *name); 1080 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *); 1081 extern int dev_ethtool(struct net *net, struct ifreq *); 1082 extern unsigned dev_get_flags(const struct net_device *); 1083 extern int dev_change_flags(struct net_device *, unsigned); 1084 extern int dev_change_name(struct net_device *, char *); 1085 extern int dev_change_net_namespace(struct net_device *, 1086 struct net *, const char *); 1087 extern int dev_set_mtu(struct net_device *, int); 1088 extern int dev_set_mac_address(struct net_device *, 1089 struct sockaddr *); 1090 extern int dev_hard_start_xmit(struct sk_buff *skb, 1091 struct net_device *dev); 1092 1093 extern int netdev_budget; 1094 1095 /* Called by rtnetlink.c:rtnl_unlock() */ 1096 extern void netdev_run_todo(void); 1097 1098 /** 1099 * dev_put - release reference to device 1100 * @dev: network device 1101 * 1102 * Release reference to device to allow it to be freed. 1103 */ 1104 static inline void dev_put(struct net_device *dev) 1105 { 1106 atomic_dec(&dev->refcnt); 1107 } 1108 1109 /** 1110 * dev_hold - get reference to device 1111 * @dev: network device 1112 * 1113 * Hold reference to device to keep it from being freed. 1114 */ 1115 static inline void dev_hold(struct net_device *dev) 1116 { 1117 atomic_inc(&dev->refcnt); 1118 } 1119 1120 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 1121 * and _off may be called from IRQ context, but it is caller 1122 * who is responsible for serialization of these calls. 1123 * 1124 * The name carrier is inappropriate, these functions should really be 1125 * called netif_lowerlayer_*() because they represent the state of any 1126 * kind of lower layer not just hardware media. 1127 */ 1128 1129 extern void linkwatch_fire_event(struct net_device *dev); 1130 1131 /** 1132 * netif_carrier_ok - test if carrier present 1133 * @dev: network device 1134 * 1135 * Check if carrier is present on device 1136 */ 1137 static inline int netif_carrier_ok(const struct net_device *dev) 1138 { 1139 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 1140 } 1141 1142 extern void __netdev_watchdog_up(struct net_device *dev); 1143 1144 extern void netif_carrier_on(struct net_device *dev); 1145 1146 extern void netif_carrier_off(struct net_device *dev); 1147 1148 /** 1149 * netif_dormant_on - mark device as dormant. 1150 * @dev: network device 1151 * 1152 * Mark device as dormant (as per RFC2863). 1153 * 1154 * The dormant state indicates that the relevant interface is not 1155 * actually in a condition to pass packets (i.e., it is not 'up') but is 1156 * in a "pending" state, waiting for some external event. For "on- 1157 * demand" interfaces, this new state identifies the situation where the 1158 * interface is waiting for events to place it in the up state. 1159 * 1160 */ 1161 static inline void netif_dormant_on(struct net_device *dev) 1162 { 1163 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 1164 linkwatch_fire_event(dev); 1165 } 1166 1167 /** 1168 * netif_dormant_off - set device as not dormant. 1169 * @dev: network device 1170 * 1171 * Device is not in dormant state. 1172 */ 1173 static inline void netif_dormant_off(struct net_device *dev) 1174 { 1175 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 1176 linkwatch_fire_event(dev); 1177 } 1178 1179 /** 1180 * netif_dormant - test if carrier present 1181 * @dev: network device 1182 * 1183 * Check if carrier is present on device 1184 */ 1185 static inline int netif_dormant(const struct net_device *dev) 1186 { 1187 return test_bit(__LINK_STATE_DORMANT, &dev->state); 1188 } 1189 1190 1191 /** 1192 * netif_oper_up - test if device is operational 1193 * @dev: network device 1194 * 1195 * Check if carrier is operational 1196 */ 1197 static inline int netif_oper_up(const struct net_device *dev) { 1198 return (dev->operstate == IF_OPER_UP || 1199 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 1200 } 1201 1202 /** 1203 * netif_device_present - is device available or removed 1204 * @dev: network device 1205 * 1206 * Check if device has not been removed from system. 1207 */ 1208 static inline int netif_device_present(struct net_device *dev) 1209 { 1210 return test_bit(__LINK_STATE_PRESENT, &dev->state); 1211 } 1212 1213 extern void netif_device_detach(struct net_device *dev); 1214 1215 extern void netif_device_attach(struct net_device *dev); 1216 1217 /* 1218 * Network interface message level settings 1219 */ 1220 #define HAVE_NETIF_MSG 1 1221 1222 enum { 1223 NETIF_MSG_DRV = 0x0001, 1224 NETIF_MSG_PROBE = 0x0002, 1225 NETIF_MSG_LINK = 0x0004, 1226 NETIF_MSG_TIMER = 0x0008, 1227 NETIF_MSG_IFDOWN = 0x0010, 1228 NETIF_MSG_IFUP = 0x0020, 1229 NETIF_MSG_RX_ERR = 0x0040, 1230 NETIF_MSG_TX_ERR = 0x0080, 1231 NETIF_MSG_TX_QUEUED = 0x0100, 1232 NETIF_MSG_INTR = 0x0200, 1233 NETIF_MSG_TX_DONE = 0x0400, 1234 NETIF_MSG_RX_STATUS = 0x0800, 1235 NETIF_MSG_PKTDATA = 0x1000, 1236 NETIF_MSG_HW = 0x2000, 1237 NETIF_MSG_WOL = 0x4000, 1238 }; 1239 1240 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 1241 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 1242 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 1243 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 1244 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 1245 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 1246 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 1247 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 1248 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 1249 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 1250 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 1251 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 1252 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 1253 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 1254 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 1255 1256 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 1257 { 1258 /* use default */ 1259 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 1260 return default_msg_enable_bits; 1261 if (debug_value == 0) /* no output */ 1262 return 0; 1263 /* set low N bits */ 1264 return (1 << debug_value) - 1; 1265 } 1266 1267 /* Test if receive needs to be scheduled but only if up */ 1268 static inline int netif_rx_schedule_prep(struct net_device *dev, 1269 struct napi_struct *napi) 1270 { 1271 return netif_running(dev) && napi_schedule_prep(napi); 1272 } 1273 1274 /* Add interface to tail of rx poll list. This assumes that _prep has 1275 * already been called and returned 1. 1276 */ 1277 static inline void __netif_rx_schedule(struct net_device *dev, 1278 struct napi_struct *napi) 1279 { 1280 dev_hold(dev); 1281 __napi_schedule(napi); 1282 } 1283 1284 /* Try to reschedule poll. Called by irq handler. */ 1285 1286 static inline void netif_rx_schedule(struct net_device *dev, 1287 struct napi_struct *napi) 1288 { 1289 if (netif_rx_schedule_prep(dev, napi)) 1290 __netif_rx_schedule(dev, napi); 1291 } 1292 1293 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). */ 1294 static inline int netif_rx_reschedule(struct net_device *dev, 1295 struct napi_struct *napi) 1296 { 1297 if (napi_schedule_prep(napi)) { 1298 __netif_rx_schedule(dev, napi); 1299 return 1; 1300 } 1301 return 0; 1302 } 1303 1304 /* same as netif_rx_complete, except that local_irq_save(flags) 1305 * has already been issued 1306 */ 1307 static inline void __netif_rx_complete(struct net_device *dev, 1308 struct napi_struct *napi) 1309 { 1310 __napi_complete(napi); 1311 dev_put(dev); 1312 } 1313 1314 /* Remove interface from poll list: it must be in the poll list 1315 * on current cpu. This primitive is called by dev->poll(), when 1316 * it completes the work. The device cannot be out of poll list at this 1317 * moment, it is BUG(). 1318 */ 1319 static inline void netif_rx_complete(struct net_device *dev, 1320 struct napi_struct *napi) 1321 { 1322 unsigned long flags; 1323 1324 local_irq_save(flags); 1325 __netif_rx_complete(dev, napi); 1326 local_irq_restore(flags); 1327 } 1328 1329 /** 1330 * netif_tx_lock - grab network device transmit lock 1331 * @dev: network device 1332 * @cpu: cpu number of lock owner 1333 * 1334 * Get network device transmit lock 1335 */ 1336 static inline void __netif_tx_lock(struct net_device *dev, int cpu) 1337 { 1338 spin_lock(&dev->_xmit_lock); 1339 dev->xmit_lock_owner = cpu; 1340 } 1341 1342 static inline void netif_tx_lock(struct net_device *dev) 1343 { 1344 __netif_tx_lock(dev, smp_processor_id()); 1345 } 1346 1347 static inline void netif_tx_lock_bh(struct net_device *dev) 1348 { 1349 spin_lock_bh(&dev->_xmit_lock); 1350 dev->xmit_lock_owner = smp_processor_id(); 1351 } 1352 1353 static inline int netif_tx_trylock(struct net_device *dev) 1354 { 1355 int ok = spin_trylock(&dev->_xmit_lock); 1356 if (likely(ok)) 1357 dev->xmit_lock_owner = smp_processor_id(); 1358 return ok; 1359 } 1360 1361 static inline void netif_tx_unlock(struct net_device *dev) 1362 { 1363 dev->xmit_lock_owner = -1; 1364 spin_unlock(&dev->_xmit_lock); 1365 } 1366 1367 static inline void netif_tx_unlock_bh(struct net_device *dev) 1368 { 1369 dev->xmit_lock_owner = -1; 1370 spin_unlock_bh(&dev->_xmit_lock); 1371 } 1372 1373 #define HARD_TX_LOCK(dev, cpu) { \ 1374 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1375 __netif_tx_lock(dev, cpu); \ 1376 } \ 1377 } 1378 1379 #define HARD_TX_UNLOCK(dev) { \ 1380 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1381 netif_tx_unlock(dev); \ 1382 } \ 1383 } 1384 1385 static inline void netif_tx_disable(struct net_device *dev) 1386 { 1387 netif_tx_lock_bh(dev); 1388 netif_stop_queue(dev); 1389 netif_tx_unlock_bh(dev); 1390 } 1391 1392 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 1393 1394 extern void ether_setup(struct net_device *dev); 1395 1396 /* Support for loadable net-drivers */ 1397 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, 1398 void (*setup)(struct net_device *), 1399 unsigned int queue_count); 1400 #define alloc_netdev(sizeof_priv, name, setup) \ 1401 alloc_netdev_mq(sizeof_priv, name, setup, 1) 1402 extern int register_netdev(struct net_device *dev); 1403 extern void unregister_netdev(struct net_device *dev); 1404 /* Functions used for secondary unicast and multicast support */ 1405 extern void dev_set_rx_mode(struct net_device *dev); 1406 extern void __dev_set_rx_mode(struct net_device *dev); 1407 extern int dev_unicast_delete(struct net_device *dev, void *addr, int alen); 1408 extern int dev_unicast_add(struct net_device *dev, void *addr, int alen); 1409 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all); 1410 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly); 1411 extern int dev_mc_sync(struct net_device *to, struct net_device *from); 1412 extern void dev_mc_unsync(struct net_device *to, struct net_device *from); 1413 extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all); 1414 extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly); 1415 extern void dev_set_promiscuity(struct net_device *dev, int inc); 1416 extern void dev_set_allmulti(struct net_device *dev, int inc); 1417 extern void netdev_state_change(struct net_device *dev); 1418 extern void netdev_features_change(struct net_device *dev); 1419 /* Load a device via the kmod */ 1420 extern void dev_load(struct net *net, const char *name); 1421 extern void dev_mcast_init(void); 1422 extern int netdev_max_backlog; 1423 extern int weight_p; 1424 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 1425 extern int skb_checksum_help(struct sk_buff *skb); 1426 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features); 1427 #ifdef CONFIG_BUG 1428 extern void netdev_rx_csum_fault(struct net_device *dev); 1429 #else 1430 static inline void netdev_rx_csum_fault(struct net_device *dev) 1431 { 1432 } 1433 #endif 1434 /* rx skb timestamps */ 1435 extern void net_enable_timestamp(void); 1436 extern void net_disable_timestamp(void); 1437 1438 #ifdef CONFIG_PROC_FS 1439 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 1440 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 1441 extern void dev_seq_stop(struct seq_file *seq, void *v); 1442 #endif 1443 1444 extern void linkwatch_run_queue(void); 1445 1446 extern int netdev_compute_features(unsigned long all, unsigned long one); 1447 1448 static inline int net_gso_ok(int features, int gso_type) 1449 { 1450 int feature = gso_type << NETIF_F_GSO_SHIFT; 1451 return (features & feature) == feature; 1452 } 1453 1454 static inline int skb_gso_ok(struct sk_buff *skb, int features) 1455 { 1456 return net_gso_ok(features, skb_shinfo(skb)->gso_type); 1457 } 1458 1459 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb) 1460 { 1461 return skb_is_gso(skb) && 1462 (!skb_gso_ok(skb, dev->features) || 1463 unlikely(skb->ip_summed != CHECKSUM_PARTIAL)); 1464 } 1465 1466 /* On bonding slaves other than the currently active slave, suppress 1467 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and 1468 * ARP on active-backup slaves with arp_validate enabled. 1469 */ 1470 static inline int skb_bond_should_drop(struct sk_buff *skb) 1471 { 1472 struct net_device *dev = skb->dev; 1473 struct net_device *master = dev->master; 1474 1475 if (master && 1476 (dev->priv_flags & IFF_SLAVE_INACTIVE)) { 1477 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) && 1478 skb->protocol == __constant_htons(ETH_P_ARP)) 1479 return 0; 1480 1481 if (master->priv_flags & IFF_MASTER_ALB) { 1482 if (skb->pkt_type != PACKET_BROADCAST && 1483 skb->pkt_type != PACKET_MULTICAST) 1484 return 0; 1485 } 1486 if (master->priv_flags & IFF_MASTER_8023AD && 1487 skb->protocol == __constant_htons(ETH_P_SLOW)) 1488 return 0; 1489 1490 return 1; 1491 } 1492 return 0; 1493 } 1494 1495 #endif /* __KERNEL__ */ 1496 1497 #endif /* _LINUX_DEV_H */ 1498