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 #include <net/dsa.h> 46 #ifdef CONFIG_DCB 47 #include <net/dcbnl.h> 48 #endif 49 50 struct vlan_group; 51 struct ethtool_ops; 52 struct netpoll_info; 53 /* 802.11 specific */ 54 struct wireless_dev; 55 /* source back-compat hooks */ 56 #define SET_ETHTOOL_OPS(netdev,ops) \ 57 ( (netdev)->ethtool_ops = (ops) ) 58 59 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev 60 functions are available. */ 61 #define HAVE_FREE_NETDEV /* free_netdev() */ 62 #define HAVE_NETDEV_PRIV /* netdev_priv() */ 63 64 #define NET_XMIT_SUCCESS 0 65 #define NET_XMIT_DROP 1 /* skb dropped */ 66 #define NET_XMIT_CN 2 /* congestion notification */ 67 #define NET_XMIT_POLICED 3 /* skb is shot by police */ 68 #define NET_XMIT_MASK 0xFFFF /* qdisc flags in net/sch_generic.h */ 69 70 /* Backlog congestion levels */ 71 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */ 72 #define NET_RX_DROP 1 /* packet dropped */ 73 #define NET_RX_CN_LOW 2 /* storm alert, just in case */ 74 #define NET_RX_CN_MOD 3 /* Storm on its way! */ 75 #define NET_RX_CN_HIGH 4 /* The storm is here */ 76 #define NET_RX_BAD 5 /* packet dropped due to kernel error */ 77 78 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It 79 * indicates that the device will soon be dropping packets, or already drops 80 * some packets of the same priority; prompting us to send less aggressively. */ 81 #define net_xmit_eval(e) ((e) == NET_XMIT_CN? 0 : (e)) 82 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0) 83 84 #endif 85 86 #define MAX_ADDR_LEN 32 /* Largest hardware address length */ 87 88 /* Driver transmit return codes */ 89 #define NETDEV_TX_OK 0 /* driver took care of packet */ 90 #define NETDEV_TX_BUSY 1 /* driver tx path was busy*/ 91 #define NETDEV_TX_LOCKED -1 /* driver tx lock was already taken */ 92 93 #ifdef __KERNEL__ 94 95 /* 96 * Compute the worst case header length according to the protocols 97 * used. 98 */ 99 100 #if defined(CONFIG_WLAN_80211) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 101 # if defined(CONFIG_MAC80211_MESH) 102 # define LL_MAX_HEADER 128 103 # else 104 # define LL_MAX_HEADER 96 105 # endif 106 #elif defined(CONFIG_TR) 107 # define LL_MAX_HEADER 48 108 #else 109 # define LL_MAX_HEADER 32 110 #endif 111 112 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \ 113 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \ 114 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \ 115 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE) 116 #define MAX_HEADER LL_MAX_HEADER 117 #else 118 #define MAX_HEADER (LL_MAX_HEADER + 48) 119 #endif 120 121 #endif /* __KERNEL__ */ 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 * LL_ALLOCATED_SPACE also takes into account the tailroom the device 249 * may need. 250 */ 251 #define LL_RESERVED_SPACE(dev) \ 252 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 253 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 254 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 255 #define LL_ALLOCATED_SPACE(dev) \ 256 ((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 257 258 struct header_ops { 259 int (*create) (struct sk_buff *skb, struct net_device *dev, 260 unsigned short type, const void *daddr, 261 const void *saddr, unsigned len); 262 int (*parse)(const struct sk_buff *skb, unsigned char *haddr); 263 int (*rebuild)(struct sk_buff *skb); 264 #define HAVE_HEADER_CACHE 265 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh); 266 void (*cache_update)(struct hh_cache *hh, 267 const struct net_device *dev, 268 const unsigned char *haddr); 269 }; 270 271 /* These flag bits are private to the generic network queueing 272 * layer, they may not be explicitly referenced by any other 273 * code. 274 */ 275 276 enum netdev_state_t 277 { 278 __LINK_STATE_START, 279 __LINK_STATE_PRESENT, 280 __LINK_STATE_NOCARRIER, 281 __LINK_STATE_LINKWATCH_PENDING, 282 __LINK_STATE_DORMANT, 283 }; 284 285 286 /* 287 * This structure holds at boot time configured netdevice settings. They 288 * are then used in the device probing. 289 */ 290 struct netdev_boot_setup { 291 char name[IFNAMSIZ]; 292 struct ifmap map; 293 }; 294 #define NETDEV_BOOT_SETUP_MAX 8 295 296 extern int __init netdev_boot_setup(char *str); 297 298 /* 299 * Structure for NAPI scheduling similar to tasklet but with weighting 300 */ 301 struct napi_struct { 302 /* The poll_list must only be managed by the entity which 303 * changes the state of the NAPI_STATE_SCHED bit. This means 304 * whoever atomically sets that bit can add this napi_struct 305 * to the per-cpu poll_list, and whoever clears that bit 306 * can remove from the list right before clearing the bit. 307 */ 308 struct list_head poll_list; 309 310 unsigned long state; 311 int weight; 312 int (*poll)(struct napi_struct *, int); 313 #ifdef CONFIG_NETPOLL 314 spinlock_t poll_lock; 315 int poll_owner; 316 struct net_device *dev; 317 #endif 318 struct list_head dev_list; 319 struct sk_buff *gro_list; 320 }; 321 322 enum 323 { 324 NAPI_STATE_SCHED, /* Poll is scheduled */ 325 NAPI_STATE_DISABLE, /* Disable pending */ 326 NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */ 327 }; 328 329 extern void __napi_schedule(struct napi_struct *n); 330 331 static inline int napi_disable_pending(struct napi_struct *n) 332 { 333 return test_bit(NAPI_STATE_DISABLE, &n->state); 334 } 335 336 /** 337 * napi_schedule_prep - check if napi can be scheduled 338 * @n: napi context 339 * 340 * Test if NAPI routine is already running, and if not mark 341 * it as running. This is used as a condition variable 342 * insure only one NAPI poll instance runs. We also make 343 * sure there is no pending NAPI disable. 344 */ 345 static inline int napi_schedule_prep(struct napi_struct *n) 346 { 347 return !napi_disable_pending(n) && 348 !test_and_set_bit(NAPI_STATE_SCHED, &n->state); 349 } 350 351 /** 352 * napi_schedule - schedule NAPI poll 353 * @n: napi context 354 * 355 * Schedule NAPI poll routine to be called if it is not already 356 * running. 357 */ 358 static inline void napi_schedule(struct napi_struct *n) 359 { 360 if (napi_schedule_prep(n)) 361 __napi_schedule(n); 362 } 363 364 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */ 365 static inline int napi_reschedule(struct napi_struct *napi) 366 { 367 if (napi_schedule_prep(napi)) { 368 __napi_schedule(napi); 369 return 1; 370 } 371 return 0; 372 } 373 374 /** 375 * napi_complete - NAPI processing complete 376 * @n: napi context 377 * 378 * Mark NAPI processing as complete. 379 */ 380 extern void __napi_complete(struct napi_struct *n); 381 extern void napi_complete(struct napi_struct *n); 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 set_bit(NAPI_STATE_DISABLE, &n->state); 393 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state)) 394 msleep(1); 395 clear_bit(NAPI_STATE_DISABLE, &n->state); 396 } 397 398 /** 399 * napi_enable - enable NAPI scheduling 400 * @n: napi context 401 * 402 * Resume NAPI from being scheduled on this context. 403 * Must be paired with napi_disable. 404 */ 405 static inline void napi_enable(struct napi_struct *n) 406 { 407 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); 408 smp_mb__before_clear_bit(); 409 clear_bit(NAPI_STATE_SCHED, &n->state); 410 } 411 412 #ifdef CONFIG_SMP 413 /** 414 * napi_synchronize - wait until NAPI is not running 415 * @n: napi context 416 * 417 * Wait until NAPI is done being scheduled on this context. 418 * Waits till any outstanding processing completes but 419 * does not disable future activations. 420 */ 421 static inline void napi_synchronize(const struct napi_struct *n) 422 { 423 while (test_bit(NAPI_STATE_SCHED, &n->state)) 424 msleep(1); 425 } 426 #else 427 # define napi_synchronize(n) barrier() 428 #endif 429 430 enum netdev_queue_state_t 431 { 432 __QUEUE_STATE_XOFF, 433 __QUEUE_STATE_FROZEN, 434 }; 435 436 struct netdev_queue { 437 struct net_device *dev; 438 struct Qdisc *qdisc; 439 unsigned long state; 440 spinlock_t _xmit_lock; 441 int xmit_lock_owner; 442 struct Qdisc *qdisc_sleeping; 443 } ____cacheline_aligned_in_smp; 444 445 446 /* 447 * This structure defines the management hooks for network devices. 448 * The following hooks can be defined; unless noted otherwise, they are 449 * optional and can be filled with a null pointer. 450 * 451 * int (*ndo_init)(struct net_device *dev); 452 * This function is called once when network device is registered. 453 * The network device can use this to any late stage initializaton 454 * or semantic validattion. It can fail with an error code which will 455 * be propogated back to register_netdev 456 * 457 * void (*ndo_uninit)(struct net_device *dev); 458 * This function is called when device is unregistered or when registration 459 * fails. It is not called if init fails. 460 * 461 * int (*ndo_open)(struct net_device *dev); 462 * This function is called when network device transistions to the up 463 * state. 464 * 465 * int (*ndo_stop)(struct net_device *dev); 466 * This function is called when network device transistions to the down 467 * state. 468 * 469 * int (*ndo_hard_start_xmit)(struct sk_buff *skb, struct net_device *dev); 470 * Called when a packet needs to be transmitted. 471 * Must return NETDEV_TX_OK , NETDEV_TX_BUSY, or NETDEV_TX_LOCKED, 472 * Required can not be NULL. 473 * 474 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb); 475 * Called to decide which queue to when device supports multiple 476 * transmit queues. 477 * 478 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags); 479 * This function is called to allow device receiver to make 480 * changes to configuration when multicast or promiscious is enabled. 481 * 482 * void (*ndo_set_rx_mode)(struct net_device *dev); 483 * This function is called device changes address list filtering. 484 * 485 * void (*ndo_set_multicast_list)(struct net_device *dev); 486 * This function is called when the multicast address list changes. 487 * 488 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr); 489 * This function is called when the Media Access Control address 490 * needs to be changed. If not this interface is not defined, the 491 * mac address can not be changed. 492 * 493 * int (*ndo_validate_addr)(struct net_device *dev); 494 * Test if Media Access Control address is valid for the device. 495 * 496 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd); 497 * Called when a user request an ioctl which can't be handled by 498 * the generic interface code. If not defined ioctl's return 499 * not supported error code. 500 * 501 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map); 502 * Used to set network devices bus interface parameters. This interface 503 * is retained for legacy reason, new devices should use the bus 504 * interface (PCI) for low level management. 505 * 506 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu); 507 * Called when a user wants to change the Maximum Transfer Unit 508 * of a device. If not defined, any request to change MTU will 509 * will return an error. 510 * 511 * void (*ndo_tx_timeout)(struct net_device *dev); 512 * Callback uses when the transmitter has not made any progress 513 * for dev->watchdog ticks. 514 * 515 * struct net_device_stats* (*get_stats)(struct net_device *dev); 516 * Called when a user wants to get the network device usage 517 * statistics. If not defined, the counters in dev->stats will 518 * be used. 519 * 520 * void (*ndo_vlan_rx_register)(struct net_device *dev, struct vlan_group *grp); 521 * If device support VLAN receive accleration 522 * (ie. dev->features & NETIF_F_HW_VLAN_RX), then this function is called 523 * when vlan groups for the device changes. Note: grp is NULL 524 * if no vlan's groups are being used. 525 * 526 * void (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid); 527 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER) 528 * this function is called when a VLAN id is registered. 529 * 530 * void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid); 531 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER) 532 * this function is called when a VLAN id is unregistered. 533 * 534 * void (*ndo_poll_controller)(struct net_device *dev); 535 */ 536 #define HAVE_NET_DEVICE_OPS 537 struct net_device_ops { 538 int (*ndo_init)(struct net_device *dev); 539 void (*ndo_uninit)(struct net_device *dev); 540 int (*ndo_open)(struct net_device *dev); 541 int (*ndo_stop)(struct net_device *dev); 542 int (*ndo_start_xmit) (struct sk_buff *skb, 543 struct net_device *dev); 544 u16 (*ndo_select_queue)(struct net_device *dev, 545 struct sk_buff *skb); 546 #define HAVE_CHANGE_RX_FLAGS 547 void (*ndo_change_rx_flags)(struct net_device *dev, 548 int flags); 549 #define HAVE_SET_RX_MODE 550 void (*ndo_set_rx_mode)(struct net_device *dev); 551 #define HAVE_MULTICAST 552 void (*ndo_set_multicast_list)(struct net_device *dev); 553 #define HAVE_SET_MAC_ADDR 554 int (*ndo_set_mac_address)(struct net_device *dev, 555 void *addr); 556 #define HAVE_VALIDATE_ADDR 557 int (*ndo_validate_addr)(struct net_device *dev); 558 #define HAVE_PRIVATE_IOCTL 559 int (*ndo_do_ioctl)(struct net_device *dev, 560 struct ifreq *ifr, int cmd); 561 #define HAVE_SET_CONFIG 562 int (*ndo_set_config)(struct net_device *dev, 563 struct ifmap *map); 564 #define HAVE_CHANGE_MTU 565 int (*ndo_change_mtu)(struct net_device *dev, 566 int new_mtu); 567 int (*ndo_neigh_setup)(struct net_device *dev, 568 struct neigh_parms *); 569 #define HAVE_TX_TIMEOUT 570 void (*ndo_tx_timeout) (struct net_device *dev); 571 572 struct net_device_stats* (*ndo_get_stats)(struct net_device *dev); 573 574 void (*ndo_vlan_rx_register)(struct net_device *dev, 575 struct vlan_group *grp); 576 void (*ndo_vlan_rx_add_vid)(struct net_device *dev, 577 unsigned short vid); 578 void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, 579 unsigned short vid); 580 #ifdef CONFIG_NET_POLL_CONTROLLER 581 #define HAVE_NETDEV_POLL 582 void (*ndo_poll_controller)(struct net_device *dev); 583 #endif 584 }; 585 586 /* 587 * The DEVICE structure. 588 * Actually, this whole structure is a big mistake. It mixes I/O 589 * data with strictly "high-level" data, and it has to know about 590 * almost every data structure used in the INET module. 591 * 592 * FIXME: cleanup struct net_device such that network protocol info 593 * moves out. 594 */ 595 596 struct net_device 597 { 598 599 /* 600 * This is the first field of the "visible" part of this structure 601 * (i.e. as seen by users in the "Space.c" file). It is the name 602 * the interface. 603 */ 604 char name[IFNAMSIZ]; 605 /* device name hash chain */ 606 struct hlist_node name_hlist; 607 /* snmp alias */ 608 char *ifalias; 609 610 /* 611 * I/O specific fields 612 * FIXME: Merge these and struct ifmap into one 613 */ 614 unsigned long mem_end; /* shared mem end */ 615 unsigned long mem_start; /* shared mem start */ 616 unsigned long base_addr; /* device I/O address */ 617 unsigned int irq; /* device IRQ number */ 618 619 /* 620 * Some hardware also needs these fields, but they are not 621 * part of the usual set specified in Space.c. 622 */ 623 624 unsigned char if_port; /* Selectable AUI, TP,..*/ 625 unsigned char dma; /* DMA channel */ 626 627 unsigned long state; 628 629 struct list_head dev_list; 630 struct list_head napi_list; 631 632 /* Net device features */ 633 unsigned long features; 634 #define NETIF_F_SG 1 /* Scatter/gather IO. */ 635 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */ 636 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ 637 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ 638 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */ 639 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ 640 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ 641 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ 642 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ 643 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ 644 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ 645 #define NETIF_F_GSO 2048 /* Enable software GSO. */ 646 #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */ 647 /* do not use LLTX in new drivers */ 648 #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */ 649 #define NETIF_F_GRO 16384 /* Generic receive offload */ 650 #define NETIF_F_LRO 32768 /* large receive offload */ 651 652 /* Segmentation offload features */ 653 #define NETIF_F_GSO_SHIFT 16 654 #define NETIF_F_GSO_MASK 0xffff0000 655 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT) 656 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT) 657 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT) 658 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT) 659 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT) 660 661 /* List of features with software fallbacks. */ 662 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6) 663 664 665 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM) 666 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM) 667 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM) 668 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM) 669 670 /* 671 * If one device supports one of these features, then enable them 672 * for all in netdev_increment_features. 673 */ 674 #define NETIF_F_ONE_FOR_ALL (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \ 675 NETIF_F_SG | NETIF_F_HIGHDMA | \ 676 NETIF_F_FRAGLIST) 677 678 /* Interface index. Unique device identifier */ 679 int ifindex; 680 int iflink; 681 682 struct net_device_stats stats; 683 684 #ifdef CONFIG_WIRELESS_EXT 685 /* List of functions to handle Wireless Extensions (instead of ioctl). 686 * See <net/iw_handler.h> for details. Jean II */ 687 const struct iw_handler_def * wireless_handlers; 688 /* Instance data managed by the core of Wireless Extensions. */ 689 struct iw_public_data * wireless_data; 690 #endif 691 /* Management operations */ 692 const struct net_device_ops *netdev_ops; 693 const struct ethtool_ops *ethtool_ops; 694 695 /* Hardware header description */ 696 const struct header_ops *header_ops; 697 698 unsigned int flags; /* interface flags (a la BSD) */ 699 unsigned short gflags; 700 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ 701 unsigned short padded; /* How much padding added by alloc_netdev() */ 702 703 unsigned char operstate; /* RFC2863 operstate */ 704 unsigned char link_mode; /* mapping policy to operstate */ 705 706 unsigned mtu; /* interface MTU value */ 707 unsigned short type; /* interface hardware type */ 708 unsigned short hard_header_len; /* hardware hdr length */ 709 710 /* extra head- and tailroom the hardware may need, but not in all cases 711 * can this be guaranteed, especially tailroom. Some cases also use 712 * LL_MAX_HEADER instead to allocate the skb. 713 */ 714 unsigned short needed_headroom; 715 unsigned short needed_tailroom; 716 717 struct net_device *master; /* Pointer to master device of a group, 718 * which this device is member of. 719 */ 720 721 /* Interface address info. */ 722 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ 723 unsigned char addr_len; /* hardware address length */ 724 unsigned short dev_id; /* for shared network cards */ 725 726 spinlock_t addr_list_lock; 727 struct dev_addr_list *uc_list; /* Secondary unicast mac addresses */ 728 int uc_count; /* Number of installed ucasts */ 729 int uc_promisc; 730 struct dev_addr_list *mc_list; /* Multicast mac addresses */ 731 int mc_count; /* Number of installed mcasts */ 732 unsigned int promiscuity; 733 unsigned int allmulti; 734 735 736 /* Protocol specific pointers */ 737 738 #ifdef CONFIG_NET_DSA 739 void *dsa_ptr; /* dsa specific data */ 740 #endif 741 void *atalk_ptr; /* AppleTalk link */ 742 void *ip_ptr; /* IPv4 specific data */ 743 void *dn_ptr; /* DECnet specific data */ 744 void *ip6_ptr; /* IPv6 specific data */ 745 void *ec_ptr; /* Econet specific data */ 746 void *ax25_ptr; /* AX.25 specific data */ 747 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data, 748 assign before registering */ 749 750 /* 751 * Cache line mostly used on receive path (including eth_type_trans()) 752 */ 753 unsigned long last_rx; /* Time of last Rx */ 754 /* Interface address info used in eth_type_trans() */ 755 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast 756 because most packets are unicast) */ 757 758 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 759 760 struct netdev_queue rx_queue; 761 762 struct netdev_queue *_tx ____cacheline_aligned_in_smp; 763 764 /* Number of TX queues allocated at alloc_netdev_mq() time */ 765 unsigned int num_tx_queues; 766 767 /* Number of TX queues currently active in device */ 768 unsigned int real_num_tx_queues; 769 770 unsigned long tx_queue_len; /* Max frames per queue allowed */ 771 spinlock_t tx_global_lock; 772 /* 773 * One part is mostly used on xmit path (device) 774 */ 775 /* These may be needed for future network-power-down code. */ 776 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 777 778 int watchdog_timeo; /* used by dev_watchdog() */ 779 struct timer_list watchdog_timer; 780 781 /* Number of references to this device */ 782 atomic_t refcnt ____cacheline_aligned_in_smp; 783 784 /* delayed register/unregister */ 785 struct list_head todo_list; 786 /* device index hash chain */ 787 struct hlist_node index_hlist; 788 789 struct net_device *link_watch_next; 790 791 /* register/unregister state machine */ 792 enum { NETREG_UNINITIALIZED=0, 793 NETREG_REGISTERED, /* completed register_netdevice */ 794 NETREG_UNREGISTERING, /* called unregister_netdevice */ 795 NETREG_UNREGISTERED, /* completed unregister todo */ 796 NETREG_RELEASED, /* called free_netdev */ 797 } reg_state; 798 799 /* Called from unregister, can be used to call free_netdev */ 800 void (*destructor)(struct net_device *dev); 801 802 #ifdef CONFIG_NETPOLL 803 struct netpoll_info *npinfo; 804 #endif 805 806 #ifdef CONFIG_NET_NS 807 /* Network namespace this network device is inside */ 808 struct net *nd_net; 809 #endif 810 811 /* mid-layer private */ 812 void *ml_priv; 813 814 /* bridge stuff */ 815 struct net_bridge_port *br_port; 816 /* macvlan */ 817 struct macvlan_port *macvlan_port; 818 /* GARP */ 819 struct garp_port *garp_port; 820 821 /* class/net/name entry */ 822 struct device dev; 823 /* space for optional statistics and wireless sysfs groups */ 824 struct attribute_group *sysfs_groups[3]; 825 826 /* rtnetlink link ops */ 827 const struct rtnl_link_ops *rtnl_link_ops; 828 829 /* VLAN feature mask */ 830 unsigned long vlan_features; 831 832 /* for setting kernel sock attribute on TCP connection setup */ 833 #define GSO_MAX_SIZE 65536 834 unsigned int gso_max_size; 835 836 #ifdef CONFIG_DCB 837 /* Data Center Bridging netlink ops */ 838 struct dcbnl_rtnl_ops *dcbnl_ops; 839 #endif 840 841 #ifdef CONFIG_COMPAT_NET_DEV_OPS 842 struct { 843 int (*init)(struct net_device *dev); 844 void (*uninit)(struct net_device *dev); 845 int (*open)(struct net_device *dev); 846 int (*stop)(struct net_device *dev); 847 int (*hard_start_xmit) (struct sk_buff *skb, 848 struct net_device *dev); 849 u16 (*select_queue)(struct net_device *dev, 850 struct sk_buff *skb); 851 void (*change_rx_flags)(struct net_device *dev, 852 int flags); 853 void (*set_rx_mode)(struct net_device *dev); 854 void (*set_multicast_list)(struct net_device *dev); 855 int (*set_mac_address)(struct net_device *dev, 856 void *addr); 857 int (*validate_addr)(struct net_device *dev); 858 int (*do_ioctl)(struct net_device *dev, 859 struct ifreq *ifr, int cmd); 860 int (*set_config)(struct net_device *dev, 861 struct ifmap *map); 862 int (*change_mtu)(struct net_device *dev, int new_mtu); 863 int (*neigh_setup)(struct net_device *dev, 864 struct neigh_parms *); 865 void (*tx_timeout) (struct net_device *dev); 866 struct net_device_stats* (*get_stats)(struct net_device *dev); 867 void (*vlan_rx_register)(struct net_device *dev, 868 struct vlan_group *grp); 869 void (*vlan_rx_add_vid)(struct net_device *dev, 870 unsigned short vid); 871 void (*vlan_rx_kill_vid)(struct net_device *dev, 872 unsigned short vid); 873 #ifdef CONFIG_NET_POLL_CONTROLLER 874 void (*poll_controller)(struct net_device *dev); 875 #endif 876 }; 877 #endif 878 }; 879 #define to_net_dev(d) container_of(d, struct net_device, dev) 880 881 #define NETDEV_ALIGN 32 882 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1) 883 884 static inline 885 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev, 886 unsigned int index) 887 { 888 return &dev->_tx[index]; 889 } 890 891 static inline void netdev_for_each_tx_queue(struct net_device *dev, 892 void (*f)(struct net_device *, 893 struct netdev_queue *, 894 void *), 895 void *arg) 896 { 897 unsigned int i; 898 899 for (i = 0; i < dev->num_tx_queues; i++) 900 f(dev, &dev->_tx[i], arg); 901 } 902 903 /* 904 * Net namespace inlines 905 */ 906 static inline 907 struct net *dev_net(const struct net_device *dev) 908 { 909 #ifdef CONFIG_NET_NS 910 return dev->nd_net; 911 #else 912 return &init_net; 913 #endif 914 } 915 916 static inline 917 void dev_net_set(struct net_device *dev, struct net *net) 918 { 919 #ifdef CONFIG_NET_NS 920 release_net(dev->nd_net); 921 dev->nd_net = hold_net(net); 922 #endif 923 } 924 925 static inline bool netdev_uses_dsa_tags(struct net_device *dev) 926 { 927 #ifdef CONFIG_NET_DSA_TAG_DSA 928 if (dev->dsa_ptr != NULL) 929 return dsa_uses_dsa_tags(dev->dsa_ptr); 930 #endif 931 932 return 0; 933 } 934 935 static inline bool netdev_uses_trailer_tags(struct net_device *dev) 936 { 937 #ifdef CONFIG_NET_DSA_TAG_TRAILER 938 if (dev->dsa_ptr != NULL) 939 return dsa_uses_trailer_tags(dev->dsa_ptr); 940 #endif 941 942 return 0; 943 } 944 945 /** 946 * netdev_priv - access network device private data 947 * @dev: network device 948 * 949 * Get network device private data 950 */ 951 static inline void *netdev_priv(const struct net_device *dev) 952 { 953 return (char *)dev + ((sizeof(struct net_device) 954 + NETDEV_ALIGN_CONST) 955 & ~NETDEV_ALIGN_CONST); 956 } 957 958 /* Set the sysfs physical device reference for the network logical device 959 * if set prior to registration will cause a symlink during initialization. 960 */ 961 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) 962 963 /** 964 * netif_napi_add - initialize a napi context 965 * @dev: network device 966 * @napi: napi context 967 * @poll: polling function 968 * @weight: default weight 969 * 970 * netif_napi_add() must be used to initialize a napi context prior to calling 971 * *any* of the other napi related functions. 972 */ 973 void netif_napi_add(struct net_device *dev, struct napi_struct *napi, 974 int (*poll)(struct napi_struct *, int), int weight); 975 976 /** 977 * netif_napi_del - remove a napi context 978 * @napi: napi context 979 * 980 * netif_napi_del() removes a napi context from the network device napi list 981 */ 982 void netif_napi_del(struct napi_struct *napi); 983 984 struct napi_gro_cb { 985 /* This is non-zero if the packet may be of the same flow. */ 986 int same_flow; 987 988 /* This is non-zero if the packet cannot be merged with the new skb. */ 989 int flush; 990 991 /* Number of segments aggregated. */ 992 int count; 993 }; 994 995 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb) 996 997 struct packet_type { 998 __be16 type; /* This is really htons(ether_type). */ 999 struct net_device *dev; /* NULL is wildcarded here */ 1000 int (*func) (struct sk_buff *, 1001 struct net_device *, 1002 struct packet_type *, 1003 struct net_device *); 1004 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 1005 int features); 1006 int (*gso_send_check)(struct sk_buff *skb); 1007 struct sk_buff **(*gro_receive)(struct sk_buff **head, 1008 struct sk_buff *skb); 1009 int (*gro_complete)(struct sk_buff *skb); 1010 void *af_packet_priv; 1011 struct list_head list; 1012 }; 1013 1014 #include <linux/interrupt.h> 1015 #include <linux/notifier.h> 1016 1017 extern rwlock_t dev_base_lock; /* Device list lock */ 1018 1019 1020 #define for_each_netdev(net, d) \ 1021 list_for_each_entry(d, &(net)->dev_base_head, dev_list) 1022 #define for_each_netdev_safe(net, d, n) \ 1023 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list) 1024 #define for_each_netdev_continue(net, d) \ 1025 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list) 1026 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) 1027 1028 static inline struct net_device *next_net_device(struct net_device *dev) 1029 { 1030 struct list_head *lh; 1031 struct net *net; 1032 1033 net = dev_net(dev); 1034 lh = dev->dev_list.next; 1035 return lh == &net->dev_base_head ? NULL : net_device_entry(lh); 1036 } 1037 1038 static inline struct net_device *first_net_device(struct net *net) 1039 { 1040 return list_empty(&net->dev_base_head) ? NULL : 1041 net_device_entry(net->dev_base_head.next); 1042 } 1043 1044 extern int netdev_boot_setup_check(struct net_device *dev); 1045 extern unsigned long netdev_boot_base(const char *prefix, int unit); 1046 extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr); 1047 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type); 1048 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type); 1049 extern void dev_add_pack(struct packet_type *pt); 1050 extern void dev_remove_pack(struct packet_type *pt); 1051 extern void __dev_remove_pack(struct packet_type *pt); 1052 1053 extern struct net_device *dev_get_by_flags(struct net *net, unsigned short flags, 1054 unsigned short mask); 1055 extern struct net_device *dev_get_by_name(struct net *net, const char *name); 1056 extern struct net_device *__dev_get_by_name(struct net *net, const char *name); 1057 extern int dev_alloc_name(struct net_device *dev, const char *name); 1058 extern int dev_open(struct net_device *dev); 1059 extern int dev_close(struct net_device *dev); 1060 extern void dev_disable_lro(struct net_device *dev); 1061 extern int dev_queue_xmit(struct sk_buff *skb); 1062 extern int register_netdevice(struct net_device *dev); 1063 extern void unregister_netdevice(struct net_device *dev); 1064 extern void free_netdev(struct net_device *dev); 1065 extern void synchronize_net(void); 1066 extern int register_netdevice_notifier(struct notifier_block *nb); 1067 extern int unregister_netdevice_notifier(struct notifier_block *nb); 1068 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev); 1069 extern struct net_device *dev_get_by_index(struct net *net, int ifindex); 1070 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex); 1071 extern int dev_restart(struct net_device *dev); 1072 #ifdef CONFIG_NETPOLL_TRAP 1073 extern int netpoll_trap(void); 1074 #endif 1075 1076 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, 1077 unsigned short type, 1078 const void *daddr, const void *saddr, 1079 unsigned len) 1080 { 1081 if (!dev->header_ops || !dev->header_ops->create) 1082 return 0; 1083 1084 return dev->header_ops->create(skb, dev, type, daddr, saddr, len); 1085 } 1086 1087 static inline int dev_parse_header(const struct sk_buff *skb, 1088 unsigned char *haddr) 1089 { 1090 const struct net_device *dev = skb->dev; 1091 1092 if (!dev->header_ops || !dev->header_ops->parse) 1093 return 0; 1094 return dev->header_ops->parse(skb, haddr); 1095 } 1096 1097 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 1098 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 1099 static inline int unregister_gifconf(unsigned int family) 1100 { 1101 return register_gifconf(family, NULL); 1102 } 1103 1104 /* 1105 * Incoming packets are placed on per-cpu queues so that 1106 * no locking is needed. 1107 */ 1108 struct softnet_data 1109 { 1110 struct Qdisc *output_queue; 1111 struct sk_buff_head input_pkt_queue; 1112 struct list_head poll_list; 1113 struct sk_buff *completion_queue; 1114 1115 struct napi_struct backlog; 1116 }; 1117 1118 DECLARE_PER_CPU(struct softnet_data,softnet_data); 1119 1120 #define HAVE_NETIF_QUEUE 1121 1122 extern void __netif_schedule(struct Qdisc *q); 1123 1124 static inline void netif_schedule_queue(struct netdev_queue *txq) 1125 { 1126 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state)) 1127 __netif_schedule(txq->qdisc); 1128 } 1129 1130 static inline void netif_tx_schedule_all(struct net_device *dev) 1131 { 1132 unsigned int i; 1133 1134 for (i = 0; i < dev->num_tx_queues; i++) 1135 netif_schedule_queue(netdev_get_tx_queue(dev, i)); 1136 } 1137 1138 static inline void netif_tx_start_queue(struct netdev_queue *dev_queue) 1139 { 1140 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1141 } 1142 1143 /** 1144 * netif_start_queue - allow transmit 1145 * @dev: network device 1146 * 1147 * Allow upper layers to call the device hard_start_xmit routine. 1148 */ 1149 static inline void netif_start_queue(struct net_device *dev) 1150 { 1151 netif_tx_start_queue(netdev_get_tx_queue(dev, 0)); 1152 } 1153 1154 static inline void netif_tx_start_all_queues(struct net_device *dev) 1155 { 1156 unsigned int i; 1157 1158 for (i = 0; i < dev->num_tx_queues; i++) { 1159 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1160 netif_tx_start_queue(txq); 1161 } 1162 } 1163 1164 static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue) 1165 { 1166 #ifdef CONFIG_NETPOLL_TRAP 1167 if (netpoll_trap()) { 1168 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1169 return; 1170 } 1171 #endif 1172 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state)) 1173 __netif_schedule(dev_queue->qdisc); 1174 } 1175 1176 /** 1177 * netif_wake_queue - restart transmit 1178 * @dev: network device 1179 * 1180 * Allow upper layers to call the device hard_start_xmit routine. 1181 * Used for flow control when transmit resources are available. 1182 */ 1183 static inline void netif_wake_queue(struct net_device *dev) 1184 { 1185 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0)); 1186 } 1187 1188 static inline void netif_tx_wake_all_queues(struct net_device *dev) 1189 { 1190 unsigned int i; 1191 1192 for (i = 0; i < dev->num_tx_queues; i++) { 1193 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1194 netif_tx_wake_queue(txq); 1195 } 1196 } 1197 1198 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue) 1199 { 1200 set_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1201 } 1202 1203 /** 1204 * netif_stop_queue - stop transmitted packets 1205 * @dev: network device 1206 * 1207 * Stop upper layers calling the device hard_start_xmit routine. 1208 * Used for flow control when transmit resources are unavailable. 1209 */ 1210 static inline void netif_stop_queue(struct net_device *dev) 1211 { 1212 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0)); 1213 } 1214 1215 static inline void netif_tx_stop_all_queues(struct net_device *dev) 1216 { 1217 unsigned int i; 1218 1219 for (i = 0; i < dev->num_tx_queues; i++) { 1220 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1221 netif_tx_stop_queue(txq); 1222 } 1223 } 1224 1225 static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue) 1226 { 1227 return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state); 1228 } 1229 1230 /** 1231 * netif_queue_stopped - test if transmit queue is flowblocked 1232 * @dev: network device 1233 * 1234 * Test if transmit queue on device is currently unable to send. 1235 */ 1236 static inline int netif_queue_stopped(const struct net_device *dev) 1237 { 1238 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0)); 1239 } 1240 1241 static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue) 1242 { 1243 return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state); 1244 } 1245 1246 /** 1247 * netif_running - test if up 1248 * @dev: network device 1249 * 1250 * Test if the device has been brought up. 1251 */ 1252 static inline int netif_running(const struct net_device *dev) 1253 { 1254 return test_bit(__LINK_STATE_START, &dev->state); 1255 } 1256 1257 /* 1258 * Routines to manage the subqueues on a device. We only need start 1259 * stop, and a check if it's stopped. All other device management is 1260 * done at the overall netdevice level. 1261 * Also test the device if we're multiqueue. 1262 */ 1263 1264 /** 1265 * netif_start_subqueue - allow sending packets on subqueue 1266 * @dev: network device 1267 * @queue_index: sub queue index 1268 * 1269 * Start individual transmit queue of a device with multiple transmit queues. 1270 */ 1271 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 1272 { 1273 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1274 clear_bit(__QUEUE_STATE_XOFF, &txq->state); 1275 } 1276 1277 /** 1278 * netif_stop_subqueue - stop sending packets on subqueue 1279 * @dev: network device 1280 * @queue_index: sub queue index 1281 * 1282 * Stop individual transmit queue of a device with multiple transmit queues. 1283 */ 1284 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 1285 { 1286 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1287 #ifdef CONFIG_NETPOLL_TRAP 1288 if (netpoll_trap()) 1289 return; 1290 #endif 1291 set_bit(__QUEUE_STATE_XOFF, &txq->state); 1292 } 1293 1294 /** 1295 * netif_subqueue_stopped - test status of subqueue 1296 * @dev: network device 1297 * @queue_index: sub queue index 1298 * 1299 * Check individual transmit queue of a device with multiple transmit queues. 1300 */ 1301 static inline int __netif_subqueue_stopped(const struct net_device *dev, 1302 u16 queue_index) 1303 { 1304 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1305 return test_bit(__QUEUE_STATE_XOFF, &txq->state); 1306 } 1307 1308 static inline int netif_subqueue_stopped(const struct net_device *dev, 1309 struct sk_buff *skb) 1310 { 1311 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb)); 1312 } 1313 1314 /** 1315 * netif_wake_subqueue - allow sending packets on subqueue 1316 * @dev: network device 1317 * @queue_index: sub queue index 1318 * 1319 * Resume individual transmit queue of a device with multiple transmit queues. 1320 */ 1321 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 1322 { 1323 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); 1324 #ifdef CONFIG_NETPOLL_TRAP 1325 if (netpoll_trap()) 1326 return; 1327 #endif 1328 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state)) 1329 __netif_schedule(txq->qdisc); 1330 } 1331 1332 /** 1333 * netif_is_multiqueue - test if device has multiple transmit queues 1334 * @dev: network device 1335 * 1336 * Check if device has multiple transmit queues 1337 */ 1338 static inline int netif_is_multiqueue(const struct net_device *dev) 1339 { 1340 return (dev->num_tx_queues > 1); 1341 } 1342 1343 /* Use this variant when it is known for sure that it 1344 * is executing from hardware interrupt context or with hardware interrupts 1345 * disabled. 1346 */ 1347 extern void dev_kfree_skb_irq(struct sk_buff *skb); 1348 1349 /* Use this variant in places where it could be invoked 1350 * from either hardware interrupt or other context, with hardware interrupts 1351 * either disabled or enabled. 1352 */ 1353 extern void dev_kfree_skb_any(struct sk_buff *skb); 1354 1355 #define HAVE_NETIF_RX 1 1356 extern int netif_rx(struct sk_buff *skb); 1357 extern int netif_rx_ni(struct sk_buff *skb); 1358 #define HAVE_NETIF_RECEIVE_SKB 1 1359 extern int netif_receive_skb(struct sk_buff *skb); 1360 extern void napi_gro_flush(struct napi_struct *napi); 1361 extern int napi_gro_receive(struct napi_struct *napi, 1362 struct sk_buff *skb); 1363 extern void netif_nit_deliver(struct sk_buff *skb); 1364 extern int dev_valid_name(const char *name); 1365 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *); 1366 extern int dev_ethtool(struct net *net, struct ifreq *); 1367 extern unsigned dev_get_flags(const struct net_device *); 1368 extern int dev_change_flags(struct net_device *, unsigned); 1369 extern int dev_change_name(struct net_device *, const char *); 1370 extern int dev_set_alias(struct net_device *, const char *, size_t); 1371 extern int dev_change_net_namespace(struct net_device *, 1372 struct net *, const char *); 1373 extern int dev_set_mtu(struct net_device *, int); 1374 extern int dev_set_mac_address(struct net_device *, 1375 struct sockaddr *); 1376 extern int dev_hard_start_xmit(struct sk_buff *skb, 1377 struct net_device *dev, 1378 struct netdev_queue *txq); 1379 1380 extern int netdev_budget; 1381 1382 /* Called by rtnetlink.c:rtnl_unlock() */ 1383 extern void netdev_run_todo(void); 1384 1385 /** 1386 * dev_put - release reference to device 1387 * @dev: network device 1388 * 1389 * Release reference to device to allow it to be freed. 1390 */ 1391 static inline void dev_put(struct net_device *dev) 1392 { 1393 atomic_dec(&dev->refcnt); 1394 } 1395 1396 /** 1397 * dev_hold - get reference to device 1398 * @dev: network device 1399 * 1400 * Hold reference to device to keep it from being freed. 1401 */ 1402 static inline void dev_hold(struct net_device *dev) 1403 { 1404 atomic_inc(&dev->refcnt); 1405 } 1406 1407 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 1408 * and _off may be called from IRQ context, but it is caller 1409 * who is responsible for serialization of these calls. 1410 * 1411 * The name carrier is inappropriate, these functions should really be 1412 * called netif_lowerlayer_*() because they represent the state of any 1413 * kind of lower layer not just hardware media. 1414 */ 1415 1416 extern void linkwatch_fire_event(struct net_device *dev); 1417 1418 /** 1419 * netif_carrier_ok - test if carrier present 1420 * @dev: network device 1421 * 1422 * Check if carrier is present on device 1423 */ 1424 static inline int netif_carrier_ok(const struct net_device *dev) 1425 { 1426 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 1427 } 1428 1429 extern void __netdev_watchdog_up(struct net_device *dev); 1430 1431 extern void netif_carrier_on(struct net_device *dev); 1432 1433 extern void netif_carrier_off(struct net_device *dev); 1434 1435 /** 1436 * netif_dormant_on - mark device as dormant. 1437 * @dev: network device 1438 * 1439 * Mark device as dormant (as per RFC2863). 1440 * 1441 * The dormant state indicates that the relevant interface is not 1442 * actually in a condition to pass packets (i.e., it is not 'up') but is 1443 * in a "pending" state, waiting for some external event. For "on- 1444 * demand" interfaces, this new state identifies the situation where the 1445 * interface is waiting for events to place it in the up state. 1446 * 1447 */ 1448 static inline void netif_dormant_on(struct net_device *dev) 1449 { 1450 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 1451 linkwatch_fire_event(dev); 1452 } 1453 1454 /** 1455 * netif_dormant_off - set device as not dormant. 1456 * @dev: network device 1457 * 1458 * Device is not in dormant state. 1459 */ 1460 static inline void netif_dormant_off(struct net_device *dev) 1461 { 1462 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 1463 linkwatch_fire_event(dev); 1464 } 1465 1466 /** 1467 * netif_dormant - test if carrier present 1468 * @dev: network device 1469 * 1470 * Check if carrier is present on device 1471 */ 1472 static inline int netif_dormant(const struct net_device *dev) 1473 { 1474 return test_bit(__LINK_STATE_DORMANT, &dev->state); 1475 } 1476 1477 1478 /** 1479 * netif_oper_up - test if device is operational 1480 * @dev: network device 1481 * 1482 * Check if carrier is operational 1483 */ 1484 static inline int netif_oper_up(const struct net_device *dev) { 1485 return (dev->operstate == IF_OPER_UP || 1486 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 1487 } 1488 1489 /** 1490 * netif_device_present - is device available or removed 1491 * @dev: network device 1492 * 1493 * Check if device has not been removed from system. 1494 */ 1495 static inline int netif_device_present(struct net_device *dev) 1496 { 1497 return test_bit(__LINK_STATE_PRESENT, &dev->state); 1498 } 1499 1500 extern void netif_device_detach(struct net_device *dev); 1501 1502 extern void netif_device_attach(struct net_device *dev); 1503 1504 /* 1505 * Network interface message level settings 1506 */ 1507 #define HAVE_NETIF_MSG 1 1508 1509 enum { 1510 NETIF_MSG_DRV = 0x0001, 1511 NETIF_MSG_PROBE = 0x0002, 1512 NETIF_MSG_LINK = 0x0004, 1513 NETIF_MSG_TIMER = 0x0008, 1514 NETIF_MSG_IFDOWN = 0x0010, 1515 NETIF_MSG_IFUP = 0x0020, 1516 NETIF_MSG_RX_ERR = 0x0040, 1517 NETIF_MSG_TX_ERR = 0x0080, 1518 NETIF_MSG_TX_QUEUED = 0x0100, 1519 NETIF_MSG_INTR = 0x0200, 1520 NETIF_MSG_TX_DONE = 0x0400, 1521 NETIF_MSG_RX_STATUS = 0x0800, 1522 NETIF_MSG_PKTDATA = 0x1000, 1523 NETIF_MSG_HW = 0x2000, 1524 NETIF_MSG_WOL = 0x4000, 1525 }; 1526 1527 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 1528 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 1529 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 1530 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 1531 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 1532 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 1533 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 1534 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 1535 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 1536 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 1537 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 1538 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 1539 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 1540 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 1541 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 1542 1543 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 1544 { 1545 /* use default */ 1546 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 1547 return default_msg_enable_bits; 1548 if (debug_value == 0) /* no output */ 1549 return 0; 1550 /* set low N bits */ 1551 return (1 << debug_value) - 1; 1552 } 1553 1554 /* Test if receive needs to be scheduled but only if up */ 1555 static inline int netif_rx_schedule_prep(struct napi_struct *napi) 1556 { 1557 return napi_schedule_prep(napi); 1558 } 1559 1560 /* Add interface to tail of rx poll list. This assumes that _prep has 1561 * already been called and returned 1. 1562 */ 1563 static inline void __netif_rx_schedule(struct napi_struct *napi) 1564 { 1565 __napi_schedule(napi); 1566 } 1567 1568 /* Try to reschedule poll. Called by irq handler. */ 1569 1570 static inline void netif_rx_schedule(struct napi_struct *napi) 1571 { 1572 if (netif_rx_schedule_prep(napi)) 1573 __netif_rx_schedule(napi); 1574 } 1575 1576 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). */ 1577 static inline int netif_rx_reschedule(struct napi_struct *napi) 1578 { 1579 if (napi_schedule_prep(napi)) { 1580 __netif_rx_schedule(napi); 1581 return 1; 1582 } 1583 return 0; 1584 } 1585 1586 /* same as netif_rx_complete, except that local_irq_save(flags) 1587 * has already been issued 1588 */ 1589 static inline void __netif_rx_complete(struct napi_struct *napi) 1590 { 1591 __napi_complete(napi); 1592 } 1593 1594 /* Remove interface from poll list: it must be in the poll list 1595 * on current cpu. This primitive is called by dev->poll(), when 1596 * it completes the work. The device cannot be out of poll list at this 1597 * moment, it is BUG(). 1598 */ 1599 static inline void netif_rx_complete(struct napi_struct *napi) 1600 { 1601 napi_complete(napi); 1602 } 1603 1604 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu) 1605 { 1606 spin_lock(&txq->_xmit_lock); 1607 txq->xmit_lock_owner = cpu; 1608 } 1609 1610 static inline void __netif_tx_lock_bh(struct netdev_queue *txq) 1611 { 1612 spin_lock_bh(&txq->_xmit_lock); 1613 txq->xmit_lock_owner = smp_processor_id(); 1614 } 1615 1616 static inline int __netif_tx_trylock(struct netdev_queue *txq) 1617 { 1618 int ok = spin_trylock(&txq->_xmit_lock); 1619 if (likely(ok)) 1620 txq->xmit_lock_owner = smp_processor_id(); 1621 return ok; 1622 } 1623 1624 static inline void __netif_tx_unlock(struct netdev_queue *txq) 1625 { 1626 txq->xmit_lock_owner = -1; 1627 spin_unlock(&txq->_xmit_lock); 1628 } 1629 1630 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq) 1631 { 1632 txq->xmit_lock_owner = -1; 1633 spin_unlock_bh(&txq->_xmit_lock); 1634 } 1635 1636 /** 1637 * netif_tx_lock - grab network device transmit lock 1638 * @dev: network device 1639 * 1640 * Get network device transmit lock 1641 */ 1642 static inline void netif_tx_lock(struct net_device *dev) 1643 { 1644 unsigned int i; 1645 int cpu; 1646 1647 spin_lock(&dev->tx_global_lock); 1648 cpu = smp_processor_id(); 1649 for (i = 0; i < dev->num_tx_queues; i++) { 1650 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1651 1652 /* We are the only thread of execution doing a 1653 * freeze, but we have to grab the _xmit_lock in 1654 * order to synchronize with threads which are in 1655 * the ->hard_start_xmit() handler and already 1656 * checked the frozen bit. 1657 */ 1658 __netif_tx_lock(txq, cpu); 1659 set_bit(__QUEUE_STATE_FROZEN, &txq->state); 1660 __netif_tx_unlock(txq); 1661 } 1662 } 1663 1664 static inline void netif_tx_lock_bh(struct net_device *dev) 1665 { 1666 local_bh_disable(); 1667 netif_tx_lock(dev); 1668 } 1669 1670 static inline void netif_tx_unlock(struct net_device *dev) 1671 { 1672 unsigned int i; 1673 1674 for (i = 0; i < dev->num_tx_queues; i++) { 1675 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1676 1677 /* No need to grab the _xmit_lock here. If the 1678 * queue is not stopped for another reason, we 1679 * force a schedule. 1680 */ 1681 clear_bit(__QUEUE_STATE_FROZEN, &txq->state); 1682 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state)) 1683 __netif_schedule(txq->qdisc); 1684 } 1685 spin_unlock(&dev->tx_global_lock); 1686 } 1687 1688 static inline void netif_tx_unlock_bh(struct net_device *dev) 1689 { 1690 netif_tx_unlock(dev); 1691 local_bh_enable(); 1692 } 1693 1694 #define HARD_TX_LOCK(dev, txq, cpu) { \ 1695 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1696 __netif_tx_lock(txq, cpu); \ 1697 } \ 1698 } 1699 1700 #define HARD_TX_UNLOCK(dev, txq) { \ 1701 if ((dev->features & NETIF_F_LLTX) == 0) { \ 1702 __netif_tx_unlock(txq); \ 1703 } \ 1704 } 1705 1706 static inline void netif_tx_disable(struct net_device *dev) 1707 { 1708 unsigned int i; 1709 int cpu; 1710 1711 local_bh_disable(); 1712 cpu = smp_processor_id(); 1713 for (i = 0; i < dev->num_tx_queues; i++) { 1714 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 1715 1716 __netif_tx_lock(txq, cpu); 1717 netif_tx_stop_queue(txq); 1718 __netif_tx_unlock(txq); 1719 } 1720 local_bh_enable(); 1721 } 1722 1723 static inline void netif_addr_lock(struct net_device *dev) 1724 { 1725 spin_lock(&dev->addr_list_lock); 1726 } 1727 1728 static inline void netif_addr_lock_bh(struct net_device *dev) 1729 { 1730 spin_lock_bh(&dev->addr_list_lock); 1731 } 1732 1733 static inline void netif_addr_unlock(struct net_device *dev) 1734 { 1735 spin_unlock(&dev->addr_list_lock); 1736 } 1737 1738 static inline void netif_addr_unlock_bh(struct net_device *dev) 1739 { 1740 spin_unlock_bh(&dev->addr_list_lock); 1741 } 1742 1743 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 1744 1745 extern void ether_setup(struct net_device *dev); 1746 1747 /* Support for loadable net-drivers */ 1748 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, 1749 void (*setup)(struct net_device *), 1750 unsigned int queue_count); 1751 #define alloc_netdev(sizeof_priv, name, setup) \ 1752 alloc_netdev_mq(sizeof_priv, name, setup, 1) 1753 extern int register_netdev(struct net_device *dev); 1754 extern void unregister_netdev(struct net_device *dev); 1755 /* Functions used for secondary unicast and multicast support */ 1756 extern void dev_set_rx_mode(struct net_device *dev); 1757 extern void __dev_set_rx_mode(struct net_device *dev); 1758 extern int dev_unicast_delete(struct net_device *dev, void *addr, int alen); 1759 extern int dev_unicast_add(struct net_device *dev, void *addr, int alen); 1760 extern int dev_unicast_sync(struct net_device *to, struct net_device *from); 1761 extern void dev_unicast_unsync(struct net_device *to, struct net_device *from); 1762 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all); 1763 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly); 1764 extern int dev_mc_sync(struct net_device *to, struct net_device *from); 1765 extern void dev_mc_unsync(struct net_device *to, struct net_device *from); 1766 extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all); 1767 extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly); 1768 extern int __dev_addr_sync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count); 1769 extern void __dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count); 1770 extern int dev_set_promiscuity(struct net_device *dev, int inc); 1771 extern int dev_set_allmulti(struct net_device *dev, int inc); 1772 extern void netdev_state_change(struct net_device *dev); 1773 extern void netdev_bonding_change(struct net_device *dev); 1774 extern void netdev_features_change(struct net_device *dev); 1775 /* Load a device via the kmod */ 1776 extern void dev_load(struct net *net, const char *name); 1777 extern void dev_mcast_init(void); 1778 extern const struct net_device_stats *dev_get_stats(struct net_device *dev); 1779 1780 extern int netdev_max_backlog; 1781 extern int weight_p; 1782 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 1783 extern int skb_checksum_help(struct sk_buff *skb); 1784 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features); 1785 #ifdef CONFIG_BUG 1786 extern void netdev_rx_csum_fault(struct net_device *dev); 1787 #else 1788 static inline void netdev_rx_csum_fault(struct net_device *dev) 1789 { 1790 } 1791 #endif 1792 /* rx skb timestamps */ 1793 extern void net_enable_timestamp(void); 1794 extern void net_disable_timestamp(void); 1795 1796 #ifdef CONFIG_PROC_FS 1797 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 1798 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 1799 extern void dev_seq_stop(struct seq_file *seq, void *v); 1800 #endif 1801 1802 extern int netdev_class_create_file(struct class_attribute *class_attr); 1803 extern void netdev_class_remove_file(struct class_attribute *class_attr); 1804 1805 extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len); 1806 1807 extern void linkwatch_run_queue(void); 1808 1809 unsigned long netdev_increment_features(unsigned long all, unsigned long one, 1810 unsigned long mask); 1811 unsigned long netdev_fix_features(unsigned long features, const char *name); 1812 1813 static inline int net_gso_ok(int features, int gso_type) 1814 { 1815 int feature = gso_type << NETIF_F_GSO_SHIFT; 1816 return (features & feature) == feature; 1817 } 1818 1819 static inline int skb_gso_ok(struct sk_buff *skb, int features) 1820 { 1821 return net_gso_ok(features, skb_shinfo(skb)->gso_type); 1822 } 1823 1824 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb) 1825 { 1826 return skb_is_gso(skb) && 1827 (!skb_gso_ok(skb, dev->features) || 1828 (skb_shinfo(skb)->frag_list && 1829 !(dev->features & NETIF_F_FRAGLIST)) || 1830 unlikely(skb->ip_summed != CHECKSUM_PARTIAL)); 1831 } 1832 1833 static inline void netif_set_gso_max_size(struct net_device *dev, 1834 unsigned int size) 1835 { 1836 dev->gso_max_size = size; 1837 } 1838 1839 /* On bonding slaves other than the currently active slave, suppress 1840 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and 1841 * ARP on active-backup slaves with arp_validate enabled. 1842 */ 1843 static inline int skb_bond_should_drop(struct sk_buff *skb) 1844 { 1845 struct net_device *dev = skb->dev; 1846 struct net_device *master = dev->master; 1847 1848 if (master) { 1849 if (master->priv_flags & IFF_MASTER_ARPMON) 1850 dev->last_rx = jiffies; 1851 1852 if (dev->priv_flags & IFF_SLAVE_INACTIVE) { 1853 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) && 1854 skb->protocol == __constant_htons(ETH_P_ARP)) 1855 return 0; 1856 1857 if (master->priv_flags & IFF_MASTER_ALB) { 1858 if (skb->pkt_type != PACKET_BROADCAST && 1859 skb->pkt_type != PACKET_MULTICAST) 1860 return 0; 1861 } 1862 if (master->priv_flags & IFF_MASTER_8023AD && 1863 skb->protocol == __constant_htons(ETH_P_SLOW)) 1864 return 0; 1865 1866 return 1; 1867 } 1868 } 1869 return 0; 1870 } 1871 1872 extern struct pernet_operations __net_initdata loopback_net_ops; 1873 #endif /* __KERNEL__ */ 1874 1875 #endif /* _LINUX_DEV_H */ 1876