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 <asm/atomic.h> 35 #include <asm/cache.h> 36 #include <asm/byteorder.h> 37 38 #include <linux/device.h> 39 #include <linux/percpu.h> 40 #include <linux/dmaengine.h> 41 42 struct vlan_group; 43 struct ethtool_ops; 44 struct netpoll_info; 45 /* 802.11 specific */ 46 struct wireless_dev; 47 /* source back-compat hooks */ 48 #define SET_ETHTOOL_OPS(netdev,ops) \ 49 ( (netdev)->ethtool_ops = (ops) ) 50 51 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev 52 functions are available. */ 53 #define HAVE_FREE_NETDEV /* free_netdev() */ 54 #define HAVE_NETDEV_PRIV /* netdev_priv() */ 55 56 #define NET_XMIT_SUCCESS 0 57 #define NET_XMIT_DROP 1 /* skb dropped */ 58 #define NET_XMIT_CN 2 /* congestion notification */ 59 #define NET_XMIT_POLICED 3 /* skb is shot by police */ 60 #define NET_XMIT_BYPASS 4 /* packet does not leave via dequeue; 61 (TC use only - dev_queue_xmit 62 returns this as NET_XMIT_SUCCESS) */ 63 64 /* Backlog congestion levels */ 65 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */ 66 #define NET_RX_DROP 1 /* packet dropped */ 67 #define NET_RX_CN_LOW 2 /* storm alert, just in case */ 68 #define NET_RX_CN_MOD 3 /* Storm on its way! */ 69 #define NET_RX_CN_HIGH 4 /* The storm is here */ 70 #define NET_RX_BAD 5 /* packet dropped due to kernel error */ 71 72 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It 73 * indicates that the device will soon be dropping packets, or already drops 74 * some packets of the same priority; prompting us to send less aggressively. */ 75 #define net_xmit_eval(e) ((e) == NET_XMIT_CN? 0 : (e)) 76 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0) 77 78 #endif 79 80 #define MAX_ADDR_LEN 32 /* Largest hardware address length */ 81 82 /* Driver transmit return codes */ 83 #define NETDEV_TX_OK 0 /* driver took care of packet */ 84 #define NETDEV_TX_BUSY 1 /* driver tx path was busy*/ 85 #define NETDEV_TX_LOCKED -1 /* driver tx lock was already taken */ 86 87 /* 88 * Compute the worst case header length according to the protocols 89 * used. 90 */ 91 92 #if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR) 93 #define LL_MAX_HEADER 32 94 #else 95 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 96 #define LL_MAX_HEADER 96 97 #else 98 #define LL_MAX_HEADER 48 99 #endif 100 #endif 101 102 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \ 103 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \ 104 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \ 105 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE) 106 #define MAX_HEADER LL_MAX_HEADER 107 #else 108 #define MAX_HEADER (LL_MAX_HEADER + 48) 109 #endif 110 111 struct net_device_subqueue 112 { 113 /* Give a control state for each queue. This struct may contain 114 * per-queue locks in the future. 115 */ 116 unsigned long state; 117 }; 118 119 /* 120 * Network device statistics. Akin to the 2.0 ether stats but 121 * with byte counters. 122 */ 123 124 struct net_device_stats 125 { 126 unsigned long rx_packets; /* total packets received */ 127 unsigned long tx_packets; /* total packets transmitted */ 128 unsigned long rx_bytes; /* total bytes received */ 129 unsigned long tx_bytes; /* total bytes transmitted */ 130 unsigned long rx_errors; /* bad packets received */ 131 unsigned long tx_errors; /* packet transmit problems */ 132 unsigned long rx_dropped; /* no space in linux buffers */ 133 unsigned long tx_dropped; /* no space available in linux */ 134 unsigned long multicast; /* multicast packets received */ 135 unsigned long collisions; 136 137 /* detailed rx_errors: */ 138 unsigned long rx_length_errors; 139 unsigned long rx_over_errors; /* receiver ring buff overflow */ 140 unsigned long rx_crc_errors; /* recved pkt with crc error */ 141 unsigned long rx_frame_errors; /* recv'd frame alignment error */ 142 unsigned long rx_fifo_errors; /* recv'r fifo overrun */ 143 unsigned long rx_missed_errors; /* receiver missed packet */ 144 145 /* detailed tx_errors */ 146 unsigned long tx_aborted_errors; 147 unsigned long tx_carrier_errors; 148 unsigned long tx_fifo_errors; 149 unsigned long tx_heartbeat_errors; 150 unsigned long tx_window_errors; 151 152 /* for cslip etc */ 153 unsigned long rx_compressed; 154 unsigned long tx_compressed; 155 }; 156 157 158 /* Media selection options. */ 159 enum { 160 IF_PORT_UNKNOWN = 0, 161 IF_PORT_10BASE2, 162 IF_PORT_10BASET, 163 IF_PORT_AUI, 164 IF_PORT_100BASET, 165 IF_PORT_100BASETX, 166 IF_PORT_100BASEFX 167 }; 168 169 #ifdef __KERNEL__ 170 171 #include <linux/cache.h> 172 #include <linux/skbuff.h> 173 174 struct neighbour; 175 struct neigh_parms; 176 struct sk_buff; 177 178 struct netif_rx_stats 179 { 180 unsigned total; 181 unsigned dropped; 182 unsigned time_squeeze; 183 unsigned cpu_collision; 184 }; 185 186 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat); 187 188 struct dev_addr_list 189 { 190 struct dev_addr_list *next; 191 u8 da_addr[MAX_ADDR_LEN]; 192 u8 da_addrlen; 193 u8 da_synced; 194 int da_users; 195 int da_gusers; 196 }; 197 198 /* 199 * We tag multicasts with these structures. 200 */ 201 202 #define dev_mc_list dev_addr_list 203 #define dmi_addr da_addr 204 #define dmi_addrlen da_addrlen 205 #define dmi_users da_users 206 #define dmi_gusers da_gusers 207 208 struct hh_cache 209 { 210 struct hh_cache *hh_next; /* Next entry */ 211 atomic_t hh_refcnt; /* number of users */ 212 /* 213 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate 214 * cache line on SMP. 215 * They are mostly read, but hh_refcnt may be changed quite frequently, 216 * incurring cache line ping pongs. 217 */ 218 __be16 hh_type ____cacheline_aligned_in_smp; 219 /* protocol identifier, f.e ETH_P_IP 220 * NOTE: For VLANs, this will be the 221 * encapuslated type. --BLG 222 */ 223 u16 hh_len; /* length of header */ 224 int (*hh_output)(struct sk_buff *skb); 225 seqlock_t hh_lock; 226 227 /* cached hardware header; allow for machine alignment needs. */ 228 #define HH_DATA_MOD 16 229 #define HH_DATA_OFF(__len) \ 230 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) 231 #define HH_DATA_ALIGN(__len) \ 232 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) 233 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; 234 }; 235 236 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much. 237 * Alternative is: 238 * dev->hard_header_len ? (dev->hard_header_len + 239 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 240 * 241 * We could use other alignment values, but we must maintain the 242 * relationship HH alignment <= LL alignment. 243 */ 244 #define LL_RESERVED_SPACE(dev) \ 245 (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 246 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 247 ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 248 249 /* These flag bits are private to the generic network queueing 250 * layer, they may not be explicitly referenced by any other 251 * code. 252 */ 253 254 enum netdev_state_t 255 { 256 __LINK_STATE_XOFF=0, 257 __LINK_STATE_START, 258 __LINK_STATE_PRESENT, 259 __LINK_STATE_SCHED, 260 __LINK_STATE_NOCARRIER, 261 __LINK_STATE_RX_SCHED, 262 __LINK_STATE_LINKWATCH_PENDING, 263 __LINK_STATE_DORMANT, 264 __LINK_STATE_QDISC_RUNNING, 265 }; 266 267 268 /* 269 * This structure holds at boot time configured netdevice settings. They 270 * are then used in the device probing. 271 */ 272 struct netdev_boot_setup { 273 char name[IFNAMSIZ]; 274 struct ifmap map; 275 }; 276 #define NETDEV_BOOT_SETUP_MAX 8 277 278 extern int __init netdev_boot_setup(char *str); 279 280 /* 281 * The DEVICE structure. 282 * Actually, this whole structure is a big mistake. It mixes I/O 283 * data with strictly "high-level" data, and it has to know about 284 * almost every data structure used in the INET module. 285 * 286 * FIXME: cleanup struct net_device such that network protocol info 287 * moves out. 288 */ 289 290 struct net_device 291 { 292 293 /* 294 * This is the first field of the "visible" part of this structure 295 * (i.e. as seen by users in the "Space.c" file). It is the name 296 * the interface. 297 */ 298 char name[IFNAMSIZ]; 299 /* device name hash chain */ 300 struct hlist_node name_hlist; 301 302 /* 303 * I/O specific fields 304 * FIXME: Merge these and struct ifmap into one 305 */ 306 unsigned long mem_end; /* shared mem end */ 307 unsigned long mem_start; /* shared mem start */ 308 unsigned long base_addr; /* device I/O address */ 309 unsigned int irq; /* device IRQ number */ 310 311 /* 312 * Some hardware also needs these fields, but they are not 313 * part of the usual set specified in Space.c. 314 */ 315 316 unsigned char if_port; /* Selectable AUI, TP,..*/ 317 unsigned char dma; /* DMA channel */ 318 319 unsigned long state; 320 321 struct list_head dev_list; 322 323 /* The device initialization function. Called only once. */ 324 int (*init)(struct net_device *dev); 325 326 /* ------- Fields preinitialized in Space.c finish here ------- */ 327 328 /* Net device features */ 329 unsigned long features; 330 #define NETIF_F_SG 1 /* Scatter/gather IO. */ 331 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */ 332 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ 333 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ 334 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */ 335 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ 336 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ 337 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ 338 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ 339 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ 340 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ 341 #define NETIF_F_GSO 2048 /* Enable software GSO. */ 342 #define NETIF_F_LLTX 4096 /* LockLess TX */ 343 #define NETIF_F_MULTI_QUEUE 16384 /* Has multiple TX/RX queues */ 344 345 /* Segmentation offload features */ 346 #define NETIF_F_GSO_SHIFT 16 347 #define NETIF_F_GSO_MASK 0xffff0000 348 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT) 349 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT) 350 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT) 351 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT) 352 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT) 353 354 /* List of features with software fallbacks. */ 355 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6) 356 357 358 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM) 359 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM) 360 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM) 361 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM) 362 363 struct net_device *next_sched; 364 365 /* Interface index. Unique device identifier */ 366 int ifindex; 367 int iflink; 368 369 370 struct net_device_stats* (*get_stats)(struct net_device *dev); 371 struct net_device_stats stats; 372 373 #ifdef CONFIG_WIRELESS_EXT 374 /* List of functions to handle Wireless Extensions (instead of ioctl). 375 * See <net/iw_handler.h> for details. Jean II */ 376 const struct iw_handler_def * wireless_handlers; 377 /* Instance data managed by the core of Wireless Extensions. */ 378 struct iw_public_data * wireless_data; 379 #endif 380 const struct ethtool_ops *ethtool_ops; 381 382 /* 383 * This marks the end of the "visible" part of the structure. All 384 * fields hereafter are internal to the system, and may change at 385 * will (read: may be cleaned up at will). 386 */ 387 388 389 unsigned int flags; /* interface flags (a la BSD) */ 390 unsigned short gflags; 391 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ 392 unsigned short padded; /* How much padding added by alloc_netdev() */ 393 394 unsigned char operstate; /* RFC2863 operstate */ 395 unsigned char link_mode; /* mapping policy to operstate */ 396 397 unsigned mtu; /* interface MTU value */ 398 unsigned short type; /* interface hardware type */ 399 unsigned short hard_header_len; /* hardware hdr length */ 400 401 struct net_device *master; /* Pointer to master device of a group, 402 * which this device is member of. 403 */ 404 405 /* Interface address info. */ 406 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ 407 unsigned char addr_len; /* hardware address length */ 408 unsigned short dev_id; /* for shared network cards */ 409 410 struct dev_addr_list *uc_list; /* Secondary unicast mac addresses */ 411 int uc_count; /* Number of installed ucasts */ 412 int uc_promisc; 413 struct dev_addr_list *mc_list; /* Multicast mac addresses */ 414 int mc_count; /* Number of installed mcasts */ 415 int promiscuity; 416 int allmulti; 417 418 419 /* Protocol specific pointers */ 420 421 void *atalk_ptr; /* AppleTalk link */ 422 void *ip_ptr; /* IPv4 specific data */ 423 void *dn_ptr; /* DECnet specific data */ 424 void *ip6_ptr; /* IPv6 specific data */ 425 void *ec_ptr; /* Econet specific data */ 426 void *ax25_ptr; /* AX.25 specific data */ 427 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data, 428 assign before registering */ 429 430 /* 431 * Cache line mostly used on receive path (including eth_type_trans()) 432 */ 433 struct list_head poll_list ____cacheline_aligned_in_smp; 434 /* Link to poll list */ 435 436 int (*poll) (struct net_device *dev, int *quota); 437 int quota; 438 int weight; 439 unsigned long last_rx; /* Time of last Rx */ 440 /* Interface address info used in eth_type_trans() */ 441 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast 442 because most packets are unicast) */ 443 444 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 445 446 /* 447 * Cache line mostly used on queue transmit path (qdisc) 448 */ 449 /* device queue lock */ 450 spinlock_t queue_lock ____cacheline_aligned_in_smp; 451 struct Qdisc *qdisc; 452 struct Qdisc *qdisc_sleeping; 453 struct list_head qdisc_list; 454 unsigned long tx_queue_len; /* Max frames per queue allowed */ 455 456 /* Partially transmitted GSO packet. */ 457 struct sk_buff *gso_skb; 458 459 /* ingress path synchronizer */ 460 spinlock_t ingress_lock; 461 struct Qdisc *qdisc_ingress; 462 463 /* 464 * One part is mostly used on xmit path (device) 465 */ 466 /* hard_start_xmit synchronizer */ 467 spinlock_t _xmit_lock ____cacheline_aligned_in_smp; 468 /* cpu id of processor entered to hard_start_xmit or -1, 469 if nobody entered there. 470 */ 471 int xmit_lock_owner; 472 void *priv; /* pointer to private data */ 473 int (*hard_start_xmit) (struct sk_buff *skb, 474 struct net_device *dev); 475 /* These may be needed for future network-power-down code. */ 476 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 477 478 int watchdog_timeo; /* used by dev_watchdog() */ 479 struct timer_list watchdog_timer; 480 481 /* 482 * refcnt is a very hot point, so align it on SMP 483 */ 484 /* Number of references to this device */ 485 atomic_t refcnt ____cacheline_aligned_in_smp; 486 487 /* delayed register/unregister */ 488 struct list_head todo_list; 489 /* device index hash chain */ 490 struct hlist_node index_hlist; 491 492 struct net_device *link_watch_next; 493 494 /* register/unregister state machine */ 495 enum { NETREG_UNINITIALIZED=0, 496 NETREG_REGISTERED, /* completed register_netdevice */ 497 NETREG_UNREGISTERING, /* called unregister_netdevice */ 498 NETREG_UNREGISTERED, /* completed unregister todo */ 499 NETREG_RELEASED, /* called free_netdev */ 500 } reg_state; 501 502 /* Called after device is detached from network. */ 503 void (*uninit)(struct net_device *dev); 504 /* Called after last user reference disappears. */ 505 void (*destructor)(struct net_device *dev); 506 507 /* Pointers to interface service routines. */ 508 int (*open)(struct net_device *dev); 509 int (*stop)(struct net_device *dev); 510 #define HAVE_NETDEV_POLL 511 int (*hard_header) (struct sk_buff *skb, 512 struct net_device *dev, 513 unsigned short type, 514 void *daddr, 515 void *saddr, 516 unsigned len); 517 int (*rebuild_header)(struct sk_buff *skb); 518 #define HAVE_CHANGE_RX_FLAGS 519 void (*change_rx_flags)(struct net_device *dev, 520 int flags); 521 #define HAVE_SET_RX_MODE 522 void (*set_rx_mode)(struct net_device *dev); 523 #define HAVE_MULTICAST 524 void (*set_multicast_list)(struct net_device *dev); 525 #define HAVE_SET_MAC_ADDR 526 int (*set_mac_address)(struct net_device *dev, 527 void *addr); 528 #define HAVE_PRIVATE_IOCTL 529 int (*do_ioctl)(struct net_device *dev, 530 struct ifreq *ifr, int cmd); 531 #define HAVE_SET_CONFIG 532 int (*set_config)(struct net_device *dev, 533 struct ifmap *map); 534 #define HAVE_HEADER_CACHE 535 int (*hard_header_cache)(struct neighbour *neigh, 536 struct hh_cache *hh); 537 void (*header_cache_update)(struct hh_cache *hh, 538 struct net_device *dev, 539 unsigned char * haddr); 540 #define HAVE_CHANGE_MTU 541 int (*change_mtu)(struct net_device *dev, int new_mtu); 542 543 #define HAVE_TX_TIMEOUT 544 void (*tx_timeout) (struct net_device *dev); 545 546 void (*vlan_rx_register)(struct net_device *dev, 547 struct vlan_group *grp); 548 void (*vlan_rx_add_vid)(struct net_device *dev, 549 unsigned short vid); 550 void (*vlan_rx_kill_vid)(struct net_device *dev, 551 unsigned short vid); 552 553 int (*hard_header_parse)(struct sk_buff *skb, 554 unsigned char *haddr); 555 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *); 556 #ifdef CONFIG_NETPOLL 557 struct netpoll_info *npinfo; 558 #endif 559 #ifdef CONFIG_NET_POLL_CONTROLLER 560 void (*poll_controller)(struct net_device *dev); 561 #endif 562 563 /* bridge stuff */ 564 struct net_bridge_port *br_port; 565 /* macvlan */ 566 struct macvlan_port *macvlan_port; 567 568 /* class/net/name entry */ 569 struct device dev; 570 /* space for optional statistics and wireless sysfs groups */ 571 struct attribute_group *sysfs_groups[3]; 572 573 /* rtnetlink link ops */ 574 const struct rtnl_link_ops *rtnl_link_ops; 575 576 /* The TX queue control structures */ 577 unsigned int egress_subqueue_count; 578 struct net_device_subqueue egress_subqueue[1]; 579 }; 580 #define to_net_dev(d) container_of(d, struct net_device, dev) 581 582 #define NETDEV_ALIGN 32 583 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1) 584 585 static inline void *netdev_priv(const struct net_device *dev) 586 { 587 return dev->priv; 588 } 589 590 #define SET_MODULE_OWNER(dev) do { } while (0) 591 /* Set the sysfs physical device reference for the network logical device 592 * if set prior to registration will cause a symlink during initialization. 593 */ 594 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) 595 596 struct packet_type { 597 __be16 type; /* This is really htons(ether_type). */ 598 struct net_device *dev; /* NULL is wildcarded here */ 599 int (*func) (struct sk_buff *, 600 struct net_device *, 601 struct packet_type *, 602 struct net_device *); 603 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 604 int features); 605 int (*gso_send_check)(struct sk_buff *skb); 606 void *af_packet_priv; 607 struct list_head list; 608 }; 609 610 #include <linux/interrupt.h> 611 #include <linux/notifier.h> 612 613 extern struct net_device loopback_dev; /* The loopback */ 614 extern struct list_head dev_base_head; /* All devices */ 615 extern rwlock_t dev_base_lock; /* Device list lock */ 616 617 #define for_each_netdev(d) \ 618 list_for_each_entry(d, &dev_base_head, dev_list) 619 #define for_each_netdev_safe(d, n) \ 620 list_for_each_entry_safe(d, n, &dev_base_head, dev_list) 621 #define for_each_netdev_continue(d) \ 622 list_for_each_entry_continue(d, &dev_base_head, dev_list) 623 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) 624 625 static inline struct net_device *next_net_device(struct net_device *dev) 626 { 627 struct list_head *lh; 628 629 lh = dev->dev_list.next; 630 return lh == &dev_base_head ? NULL : net_device_entry(lh); 631 } 632 633 static inline struct net_device *first_net_device(void) 634 { 635 return list_empty(&dev_base_head) ? NULL : 636 net_device_entry(dev_base_head.next); 637 } 638 639 extern int netdev_boot_setup_check(struct net_device *dev); 640 extern unsigned long netdev_boot_base(const char *prefix, int unit); 641 extern struct net_device *dev_getbyhwaddr(unsigned short type, char *hwaddr); 642 extern struct net_device *dev_getfirstbyhwtype(unsigned short type); 643 extern struct net_device *__dev_getfirstbyhwtype(unsigned short type); 644 extern void dev_add_pack(struct packet_type *pt); 645 extern void dev_remove_pack(struct packet_type *pt); 646 extern void __dev_remove_pack(struct packet_type *pt); 647 648 extern struct net_device *dev_get_by_flags(unsigned short flags, 649 unsigned short mask); 650 extern struct net_device *dev_get_by_name(const char *name); 651 extern struct net_device *__dev_get_by_name(const char *name); 652 extern int dev_alloc_name(struct net_device *dev, const char *name); 653 extern int dev_open(struct net_device *dev); 654 extern int dev_close(struct net_device *dev); 655 extern int dev_queue_xmit(struct sk_buff *skb); 656 extern int register_netdevice(struct net_device *dev); 657 extern void unregister_netdevice(struct net_device *dev); 658 extern void free_netdev(struct net_device *dev); 659 extern void synchronize_net(void); 660 extern int register_netdevice_notifier(struct notifier_block *nb); 661 extern int unregister_netdevice_notifier(struct notifier_block *nb); 662 extern int call_netdevice_notifiers(unsigned long val, void *v); 663 extern struct net_device *dev_get_by_index(int ifindex); 664 extern struct net_device *__dev_get_by_index(int ifindex); 665 extern int dev_restart(struct net_device *dev); 666 #ifdef CONFIG_NETPOLL_TRAP 667 extern int netpoll_trap(void); 668 #endif 669 670 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 671 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 672 static inline int unregister_gifconf(unsigned int family) 673 { 674 return register_gifconf(family, NULL); 675 } 676 677 /* 678 * Incoming packets are placed on per-cpu queues so that 679 * no locking is needed. 680 */ 681 682 struct softnet_data 683 { 684 struct net_device *output_queue; 685 struct sk_buff_head input_pkt_queue; 686 struct list_head poll_list; 687 struct sk_buff *completion_queue; 688 689 struct net_device backlog_dev; /* Sorry. 8) */ 690 #ifdef CONFIG_NET_DMA 691 struct dma_chan *net_dma; 692 #endif 693 }; 694 695 DECLARE_PER_CPU(struct softnet_data,softnet_data); 696 697 #define HAVE_NETIF_QUEUE 698 699 extern void __netif_schedule(struct net_device *dev); 700 701 static inline void netif_schedule(struct net_device *dev) 702 { 703 if (!test_bit(__LINK_STATE_XOFF, &dev->state)) 704 __netif_schedule(dev); 705 } 706 707 static inline void netif_start_queue(struct net_device *dev) 708 { 709 clear_bit(__LINK_STATE_XOFF, &dev->state); 710 } 711 712 static inline void netif_wake_queue(struct net_device *dev) 713 { 714 #ifdef CONFIG_NETPOLL_TRAP 715 if (netpoll_trap()) { 716 clear_bit(__LINK_STATE_XOFF, &dev->state); 717 return; 718 } 719 #endif 720 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state)) 721 __netif_schedule(dev); 722 } 723 724 static inline void netif_stop_queue(struct net_device *dev) 725 { 726 set_bit(__LINK_STATE_XOFF, &dev->state); 727 } 728 729 static inline int netif_queue_stopped(const struct net_device *dev) 730 { 731 return test_bit(__LINK_STATE_XOFF, &dev->state); 732 } 733 734 static inline int netif_running(const struct net_device *dev) 735 { 736 return test_bit(__LINK_STATE_START, &dev->state); 737 } 738 739 /* 740 * Routines to manage the subqueues on a device. We only need start 741 * stop, and a check if it's stopped. All other device management is 742 * done at the overall netdevice level. 743 * Also test the device if we're multiqueue. 744 */ 745 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 746 { 747 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 748 clear_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state); 749 #endif 750 } 751 752 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 753 { 754 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 755 #ifdef CONFIG_NETPOLL_TRAP 756 if (netpoll_trap()) 757 return; 758 #endif 759 set_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state); 760 #endif 761 } 762 763 static inline int netif_subqueue_stopped(const struct net_device *dev, 764 u16 queue_index) 765 { 766 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 767 return test_bit(__LINK_STATE_XOFF, 768 &dev->egress_subqueue[queue_index].state); 769 #else 770 return 0; 771 #endif 772 } 773 774 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 775 { 776 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 777 #ifdef CONFIG_NETPOLL_TRAP 778 if (netpoll_trap()) 779 return; 780 #endif 781 if (test_and_clear_bit(__LINK_STATE_XOFF, 782 &dev->egress_subqueue[queue_index].state)) 783 __netif_schedule(dev); 784 #endif 785 } 786 787 static inline int netif_is_multiqueue(const struct net_device *dev) 788 { 789 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 790 return (!!(NETIF_F_MULTI_QUEUE & dev->features)); 791 #else 792 return 0; 793 #endif 794 } 795 796 /* Use this variant when it is known for sure that it 797 * is executing from interrupt context. 798 */ 799 static inline void dev_kfree_skb_irq(struct sk_buff *skb) 800 { 801 if (atomic_dec_and_test(&skb->users)) { 802 struct softnet_data *sd; 803 unsigned long flags; 804 805 local_irq_save(flags); 806 sd = &__get_cpu_var(softnet_data); 807 skb->next = sd->completion_queue; 808 sd->completion_queue = skb; 809 raise_softirq_irqoff(NET_TX_SOFTIRQ); 810 local_irq_restore(flags); 811 } 812 } 813 814 /* Use this variant in places where it could be invoked 815 * either from interrupt or non-interrupt context. 816 */ 817 extern void dev_kfree_skb_any(struct sk_buff *skb); 818 819 #define HAVE_NETIF_RX 1 820 extern int netif_rx(struct sk_buff *skb); 821 extern int netif_rx_ni(struct sk_buff *skb); 822 #define HAVE_NETIF_RECEIVE_SKB 1 823 extern int netif_receive_skb(struct sk_buff *skb); 824 extern int dev_valid_name(const char *name); 825 extern int dev_ioctl(unsigned int cmd, void __user *); 826 extern int dev_ethtool(struct ifreq *); 827 extern unsigned dev_get_flags(const struct net_device *); 828 extern int dev_change_flags(struct net_device *, unsigned); 829 extern int dev_change_name(struct net_device *, char *); 830 extern int dev_set_mtu(struct net_device *, int); 831 extern int dev_set_mac_address(struct net_device *, 832 struct sockaddr *); 833 extern int dev_hard_start_xmit(struct sk_buff *skb, 834 struct net_device *dev); 835 836 extern void dev_init(void); 837 838 extern int netdev_budget; 839 840 /* Called by rtnetlink.c:rtnl_unlock() */ 841 extern void netdev_run_todo(void); 842 843 static inline void dev_put(struct net_device *dev) 844 { 845 atomic_dec(&dev->refcnt); 846 } 847 848 static inline void dev_hold(struct net_device *dev) 849 { 850 atomic_inc(&dev->refcnt); 851 } 852 853 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 854 * and _off may be called from IRQ context, but it is caller 855 * who is responsible for serialization of these calls. 856 * 857 * The name carrier is inappropriate, these functions should really be 858 * called netif_lowerlayer_*() because they represent the state of any 859 * kind of lower layer not just hardware media. 860 */ 861 862 extern void linkwatch_fire_event(struct net_device *dev); 863 864 static inline int netif_carrier_ok(const struct net_device *dev) 865 { 866 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 867 } 868 869 extern void __netdev_watchdog_up(struct net_device *dev); 870 871 extern void netif_carrier_on(struct net_device *dev); 872 873 extern void netif_carrier_off(struct net_device *dev); 874 875 static inline void netif_dormant_on(struct net_device *dev) 876 { 877 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 878 linkwatch_fire_event(dev); 879 } 880 881 static inline void netif_dormant_off(struct net_device *dev) 882 { 883 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 884 linkwatch_fire_event(dev); 885 } 886 887 static inline int netif_dormant(const struct net_device *dev) 888 { 889 return test_bit(__LINK_STATE_DORMANT, &dev->state); 890 } 891 892 893 static inline int netif_oper_up(const struct net_device *dev) { 894 return (dev->operstate == IF_OPER_UP || 895 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 896 } 897 898 /* Hot-plugging. */ 899 static inline int netif_device_present(struct net_device *dev) 900 { 901 return test_bit(__LINK_STATE_PRESENT, &dev->state); 902 } 903 904 extern void netif_device_detach(struct net_device *dev); 905 906 extern void netif_device_attach(struct net_device *dev); 907 908 /* 909 * Network interface message level settings 910 */ 911 #define HAVE_NETIF_MSG 1 912 913 enum { 914 NETIF_MSG_DRV = 0x0001, 915 NETIF_MSG_PROBE = 0x0002, 916 NETIF_MSG_LINK = 0x0004, 917 NETIF_MSG_TIMER = 0x0008, 918 NETIF_MSG_IFDOWN = 0x0010, 919 NETIF_MSG_IFUP = 0x0020, 920 NETIF_MSG_RX_ERR = 0x0040, 921 NETIF_MSG_TX_ERR = 0x0080, 922 NETIF_MSG_TX_QUEUED = 0x0100, 923 NETIF_MSG_INTR = 0x0200, 924 NETIF_MSG_TX_DONE = 0x0400, 925 NETIF_MSG_RX_STATUS = 0x0800, 926 NETIF_MSG_PKTDATA = 0x1000, 927 NETIF_MSG_HW = 0x2000, 928 NETIF_MSG_WOL = 0x4000, 929 }; 930 931 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 932 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 933 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 934 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 935 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 936 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 937 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 938 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 939 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 940 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 941 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 942 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 943 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 944 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 945 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 946 947 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 948 { 949 /* use default */ 950 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 951 return default_msg_enable_bits; 952 if (debug_value == 0) /* no output */ 953 return 0; 954 /* set low N bits */ 955 return (1 << debug_value) - 1; 956 } 957 958 /* Test if receive needs to be scheduled */ 959 static inline int __netif_rx_schedule_prep(struct net_device *dev) 960 { 961 return !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state); 962 } 963 964 /* Test if receive needs to be scheduled but only if up */ 965 static inline int netif_rx_schedule_prep(struct net_device *dev) 966 { 967 return netif_running(dev) && __netif_rx_schedule_prep(dev); 968 } 969 970 /* Add interface to tail of rx poll list. This assumes that _prep has 971 * already been called and returned 1. 972 */ 973 974 extern void __netif_rx_schedule(struct net_device *dev); 975 976 /* Try to reschedule poll. Called by irq handler. */ 977 978 static inline void netif_rx_schedule(struct net_device *dev) 979 { 980 if (netif_rx_schedule_prep(dev)) 981 __netif_rx_schedule(dev); 982 } 983 984 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). 985 * Do not inline this? 986 */ 987 static inline int netif_rx_reschedule(struct net_device *dev, int undo) 988 { 989 if (netif_rx_schedule_prep(dev)) { 990 unsigned long flags; 991 992 dev->quota += undo; 993 994 local_irq_save(flags); 995 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list); 996 __raise_softirq_irqoff(NET_RX_SOFTIRQ); 997 local_irq_restore(flags); 998 return 1; 999 } 1000 return 0; 1001 } 1002 1003 /* same as netif_rx_complete, except that local_irq_save(flags) 1004 * has already been issued 1005 */ 1006 static inline void __netif_rx_complete(struct net_device *dev) 1007 { 1008 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state)); 1009 list_del(&dev->poll_list); 1010 smp_mb__before_clear_bit(); 1011 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 1012 } 1013 1014 /* Remove interface from poll list: it must be in the poll list 1015 * on current cpu. This primitive is called by dev->poll(), when 1016 * it completes the work. The device cannot be out of poll list at this 1017 * moment, it is BUG(). 1018 */ 1019 static inline void netif_rx_complete(struct net_device *dev) 1020 { 1021 unsigned long flags; 1022 1023 local_irq_save(flags); 1024 __netif_rx_complete(dev); 1025 local_irq_restore(flags); 1026 } 1027 1028 static inline void netif_poll_disable(struct net_device *dev) 1029 { 1030 while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state)) 1031 /* No hurry. */ 1032 schedule_timeout_interruptible(1); 1033 } 1034 1035 static inline void netif_poll_enable(struct net_device *dev) 1036 { 1037 smp_mb__before_clear_bit(); 1038 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 1039 } 1040 1041 static inline void netif_tx_lock(struct net_device *dev) 1042 { 1043 spin_lock(&dev->_xmit_lock); 1044 dev->xmit_lock_owner = smp_processor_id(); 1045 } 1046 1047 static inline void netif_tx_lock_bh(struct net_device *dev) 1048 { 1049 spin_lock_bh(&dev->_xmit_lock); 1050 dev->xmit_lock_owner = smp_processor_id(); 1051 } 1052 1053 static inline int netif_tx_trylock(struct net_device *dev) 1054 { 1055 int ok = spin_trylock(&dev->_xmit_lock); 1056 if (likely(ok)) 1057 dev->xmit_lock_owner = smp_processor_id(); 1058 return ok; 1059 } 1060 1061 static inline void netif_tx_unlock(struct net_device *dev) 1062 { 1063 dev->xmit_lock_owner = -1; 1064 spin_unlock(&dev->_xmit_lock); 1065 } 1066 1067 static inline void netif_tx_unlock_bh(struct net_device *dev) 1068 { 1069 dev->xmit_lock_owner = -1; 1070 spin_unlock_bh(&dev->_xmit_lock); 1071 } 1072 1073 static inline void netif_tx_disable(struct net_device *dev) 1074 { 1075 netif_tx_lock_bh(dev); 1076 netif_stop_queue(dev); 1077 netif_tx_unlock_bh(dev); 1078 } 1079 1080 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 1081 1082 extern void ether_setup(struct net_device *dev); 1083 1084 /* Support for loadable net-drivers */ 1085 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, 1086 void (*setup)(struct net_device *), 1087 unsigned int queue_count); 1088 #define alloc_netdev(sizeof_priv, name, setup) \ 1089 alloc_netdev_mq(sizeof_priv, name, setup, 1) 1090 extern int register_netdev(struct net_device *dev); 1091 extern void unregister_netdev(struct net_device *dev); 1092 /* Functions used for secondary unicast and multicast support */ 1093 extern void dev_set_rx_mode(struct net_device *dev); 1094 extern void __dev_set_rx_mode(struct net_device *dev); 1095 extern int dev_unicast_delete(struct net_device *dev, void *addr, int alen); 1096 extern int dev_unicast_add(struct net_device *dev, void *addr, int alen); 1097 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all); 1098 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly); 1099 extern int dev_mc_sync(struct net_device *to, struct net_device *from); 1100 extern void dev_mc_unsync(struct net_device *to, struct net_device *from); 1101 extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all); 1102 extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly); 1103 extern void dev_set_promiscuity(struct net_device *dev, int inc); 1104 extern void dev_set_allmulti(struct net_device *dev, int inc); 1105 extern void netdev_state_change(struct net_device *dev); 1106 extern void netdev_features_change(struct net_device *dev); 1107 /* Load a device via the kmod */ 1108 extern void dev_load(const char *name); 1109 extern void dev_mcast_init(void); 1110 extern int netdev_max_backlog; 1111 extern int weight_p; 1112 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 1113 extern int skb_checksum_help(struct sk_buff *skb); 1114 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features); 1115 #ifdef CONFIG_BUG 1116 extern void netdev_rx_csum_fault(struct net_device *dev); 1117 #else 1118 static inline void netdev_rx_csum_fault(struct net_device *dev) 1119 { 1120 } 1121 #endif 1122 /* rx skb timestamps */ 1123 extern void net_enable_timestamp(void); 1124 extern void net_disable_timestamp(void); 1125 1126 #ifdef CONFIG_PROC_FS 1127 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 1128 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 1129 extern void dev_seq_stop(struct seq_file *seq, void *v); 1130 #endif 1131 1132 extern void linkwatch_run_queue(void); 1133 1134 extern int netdev_compute_features(unsigned long all, unsigned long one); 1135 1136 static inline int net_gso_ok(int features, int gso_type) 1137 { 1138 int feature = gso_type << NETIF_F_GSO_SHIFT; 1139 return (features & feature) == feature; 1140 } 1141 1142 static inline int skb_gso_ok(struct sk_buff *skb, int features) 1143 { 1144 return net_gso_ok(features, skb_shinfo(skb)->gso_type); 1145 } 1146 1147 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb) 1148 { 1149 return skb_is_gso(skb) && 1150 (!skb_gso_ok(skb, dev->features) || 1151 unlikely(skb->ip_summed != CHECKSUM_PARTIAL)); 1152 } 1153 1154 /* On bonding slaves other than the currently active slave, suppress 1155 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and 1156 * ARP on active-backup slaves with arp_validate enabled. 1157 */ 1158 static inline int skb_bond_should_drop(struct sk_buff *skb) 1159 { 1160 struct net_device *dev = skb->dev; 1161 struct net_device *master = dev->master; 1162 1163 if (master && 1164 (dev->priv_flags & IFF_SLAVE_INACTIVE)) { 1165 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) && 1166 skb->protocol == __constant_htons(ETH_P_ARP)) 1167 return 0; 1168 1169 if (master->priv_flags & IFF_MASTER_ALB) { 1170 if (skb->pkt_type != PACKET_BROADCAST && 1171 skb->pkt_type != PACKET_MULTICAST) 1172 return 0; 1173 } 1174 if (master->priv_flags & IFF_MASTER_8023AD && 1175 skb->protocol == __constant_htons(ETH_P_SLOW)) 1176 return 0; 1177 1178 return 1; 1179 } 1180 return 0; 1181 } 1182 1183 #endif /* __KERNEL__ */ 1184 1185 #endif /* _LINUX_DEV_H */ 1186