linux/include/linux/netdevice.h
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   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, <waltje@uWalt.NL.Mugnet.ORG>
  12 *              Corey Minyard <wf-rch!minyard@relay.EU.net>
  13 *              Donald J. Becker, <becker@cesdis.gsfc.nasa.gov>
  14 *              Alan Cox, <alan@lxorguk.ukuu.org.uk>
  15 *              Bjorn Ekwall. <bj0rn@blox.se>
  16 *              Pekka Riikonen <priikone@poseidon.pspt.fi>
  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
  50struct vlan_group;
  51struct ethtool_ops;
  52struct netpoll_info;
  53/* 802.11 specific */
  54struct 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 
 128struct 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. */
 163enum {
 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
 178struct neighbour;
 179struct neigh_parms;
 180struct sk_buff;
 181
 182struct netif_rx_stats
 183{
 184        unsigned total;
 185        unsigned dropped;
 186        unsigned time_squeeze;
 187        unsigned cpu_collision;
 188};
 189
 190DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
 191
 192struct 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
 212struct 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
 258struct 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
 276enum 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 */
 290struct netdev_boot_setup {
 291        char name[IFNAMSIZ];
 292        struct ifmap map;
 293};
 294#define NETDEV_BOOT_SETUP_MAX 8
 295
 296extern int __init netdev_boot_setup(char *str);
 297
 298/*
 299 * Structure for NAPI scheduling similar to tasklet but with weighting
 300 */
 301struct 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#endif
 317        struct net_device       *dev;
 318        struct list_head        dev_list;
 319        struct sk_buff          *gro_list;
 320        struct sk_buff          *skb;
 321};
 322
 323enum
 324{
 325        NAPI_STATE_SCHED,       /* Poll is scheduled */
 326        NAPI_STATE_DISABLE,     /* Disable pending */
 327        NAPI_STATE_NPSVC,       /* Netpoll - don't dequeue from poll_list */
 328};
 329
 330extern void __napi_schedule(struct napi_struct *n);
 331
 332static inline int napi_disable_pending(struct napi_struct *n)
 333{
 334        return test_bit(NAPI_STATE_DISABLE, &n->state);
 335}
 336
 337/**
 338 *      napi_schedule_prep - check if napi can be scheduled
 339 *      @n: napi context
 340 *
 341 * Test if NAPI routine is already running, and if not mark
 342 * it as running.  This is used as a condition variable
 343 * insure only one NAPI poll instance runs.  We also make
 344 * sure there is no pending NAPI disable.
 345 */
 346static inline int napi_schedule_prep(struct napi_struct *n)
 347{
 348        return !napi_disable_pending(n) &&
 349                !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
 350}
 351
 352/**
 353 *      napi_schedule - schedule NAPI poll
 354 *      @n: napi context
 355 *
 356 * Schedule NAPI poll routine to be called if it is not already
 357 * running.
 358 */
 359static inline void napi_schedule(struct napi_struct *n)
 360{
 361        if (napi_schedule_prep(n))
 362                __napi_schedule(n);
 363}
 364
 365/* Try to reschedule poll. Called by dev->poll() after napi_complete().  */
 366static inline int napi_reschedule(struct napi_struct *napi)
 367{
 368        if (napi_schedule_prep(napi)) {
 369                __napi_schedule(napi);
 370                return 1;
 371        }
 372        return 0;
 373}
 374
 375/**
 376 *      napi_complete - NAPI processing complete
 377 *      @n: napi context
 378 *
 379 * Mark NAPI processing as complete.
 380 */
 381extern void __napi_complete(struct napi_struct *n);
 382extern void napi_complete(struct napi_struct *n);
 383
 384/**
 385 *      napi_disable - prevent NAPI from scheduling
 386 *      @n: napi context
 387 *
 388 * Stop NAPI from being scheduled on this context.
 389 * Waits till any outstanding processing completes.
 390 */
 391static inline void napi_disable(struct napi_struct *n)
 392{
 393        set_bit(NAPI_STATE_DISABLE, &n->state);
 394        while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
 395                msleep(1);
 396        clear_bit(NAPI_STATE_DISABLE, &n->state);
 397}
 398
 399/**
 400 *      napi_enable - enable NAPI scheduling
 401 *      @n: napi context
 402 *
 403 * Resume NAPI from being scheduled on this context.
 404 * Must be paired with napi_disable.
 405 */
 406static inline void napi_enable(struct napi_struct *n)
 407{
 408        BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
 409        smp_mb__before_clear_bit();
 410        clear_bit(NAPI_STATE_SCHED, &n->state);
 411}
 412
 413#ifdef CONFIG_SMP
 414/**
 415 *      napi_synchronize - wait until NAPI is not running
 416 *      @n: napi context
 417 *
 418 * Wait until NAPI is done being scheduled on this context.
 419 * Waits till any outstanding processing completes but
 420 * does not disable future activations.
 421 */
 422static inline void napi_synchronize(const struct napi_struct *n)
 423{
 424        while (test_bit(NAPI_STATE_SCHED, &n->state))
 425                msleep(1);
 426}
 427#else
 428# define napi_synchronize(n)    barrier()
 429#endif
 430
 431enum netdev_queue_state_t
 432{
 433        __QUEUE_STATE_XOFF,
 434        __QUEUE_STATE_FROZEN,
 435};
 436
 437struct netdev_queue {
 438        struct net_device       *dev;
 439        struct Qdisc            *qdisc;
 440        unsigned long           state;
 441        spinlock_t              _xmit_lock;
 442        int                     xmit_lock_owner;
 443        struct Qdisc            *qdisc_sleeping;
 444} ____cacheline_aligned_in_smp;
 445
 446
 447/*
 448 * This structure defines the management hooks for network devices.
 449 * The following hooks can be defined; unless noted otherwise, they are
 450 * optional and can be filled with a null pointer.
 451 *
 452 * int (*ndo_init)(struct net_device *dev);
 453 *     This function is called once when network device is registered.
 454 *     The network device can use this to any late stage initializaton
 455 *     or semantic validattion. It can fail with an error code which will
 456 *     be propogated back to register_netdev
 457 *
 458 * void (*ndo_uninit)(struct net_device *dev);
 459 *     This function is called when device is unregistered or when registration
 460 *     fails. It is not called if init fails.
 461 *
 462 * int (*ndo_open)(struct net_device *dev);
 463 *     This function is called when network device transistions to the up
 464 *     state.
 465 *
 466 * int (*ndo_stop)(struct net_device *dev);
 467 *     This function is called when network device transistions to the down
 468 *     state.
 469 *
 470 * int (*ndo_start_xmit)(struct sk_buff *skb, struct net_device *dev);
 471 *      Called when a packet needs to be transmitted.
 472 *      Must return NETDEV_TX_OK , NETDEV_TX_BUSY, or NETDEV_TX_LOCKED,
 473 *      Required can not be NULL.
 474 *
 475 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
 476 *      Called to decide which queue to when device supports multiple
 477 *      transmit queues.
 478 *
 479 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
 480 *      This function is called to allow device receiver to make
 481 *      changes to configuration when multicast or promiscious is enabled.
 482 *
 483 * void (*ndo_set_rx_mode)(struct net_device *dev);
 484 *      This function is called device changes address list filtering.
 485 *
 486 * void (*ndo_set_multicast_list)(struct net_device *dev);
 487 *      This function is called when the multicast address list changes.
 488 *
 489 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
 490 *      This function  is called when the Media Access Control address
 491 *      needs to be changed. If not this interface is not defined, the
 492 *      mac address can not be changed.
 493 *
 494 * int (*ndo_validate_addr)(struct net_device *dev);
 495 *      Test if Media Access Control address is valid for the device.
 496 *
 497 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
 498 *      Called when a user request an ioctl which can't be handled by
 499 *      the generic interface code. If not defined ioctl's return
 500 *      not supported error code.
 501 *
 502 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
 503 *      Used to set network devices bus interface parameters. This interface
 504 *      is retained for legacy reason, new devices should use the bus
 505 *      interface (PCI) for low level management.
 506 *
 507 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
 508 *      Called when a user wants to change the Maximum Transfer Unit
 509 *      of a device. If not defined, any request to change MTU will
 510 *      will return an error.
 511 *
 512 * void (*ndo_tx_timeout)(struct net_device *dev);
 513 *      Callback uses when the transmitter has not made any progress
 514 *      for dev->watchdog ticks.
 515 *
 516 * struct net_device_stats* (*get_stats)(struct net_device *dev);
 517 *      Called when a user wants to get the network device usage
 518 *      statistics. If not defined, the counters in dev->stats will
 519 *      be used.
 520 *
 521 * void (*ndo_vlan_rx_register)(struct net_device *dev, struct vlan_group *grp);
 522 *      If device support VLAN receive accleration
 523 *      (ie. dev->features & NETIF_F_HW_VLAN_RX), then this function is called
 524 *      when vlan groups for the device changes.  Note: grp is NULL
 525 *      if no vlan's groups are being used.
 526 *
 527 * void (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid);
 528 *      If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
 529 *      this function is called when a VLAN id is registered.
 530 *
 531 * void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
 532 *      If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
 533 *      this function is called when a VLAN id is unregistered.
 534 *
 535 * void (*ndo_poll_controller)(struct net_device *dev);
 536 */
 537#define HAVE_NET_DEVICE_OPS
 538struct net_device_ops {
 539        int                     (*ndo_init)(struct net_device *dev);
 540        void                    (*ndo_uninit)(struct net_device *dev);
 541        int                     (*ndo_open)(struct net_device *dev);
 542        int                     (*ndo_stop)(struct net_device *dev);
 543        int                     (*ndo_start_xmit) (struct sk_buff *skb,
 544                                                   struct net_device *dev);
 545        u16                     (*ndo_select_queue)(struct net_device *dev,
 546                                                    struct sk_buff *skb);
 547#define HAVE_CHANGE_RX_FLAGS
 548        void                    (*ndo_change_rx_flags)(struct net_device *dev,
 549                                                       int flags);
 550#define HAVE_SET_RX_MODE
 551        void                    (*ndo_set_rx_mode)(struct net_device *dev);
 552#define HAVE_MULTICAST
 553        void                    (*ndo_set_multicast_list)(struct net_device *dev);
 554#define HAVE_SET_MAC_ADDR
 555        int                     (*ndo_set_mac_address)(struct net_device *dev,
 556                                                       void *addr);
 557#define HAVE_VALIDATE_ADDR
 558        int                     (*ndo_validate_addr)(struct net_device *dev);
 559#define HAVE_PRIVATE_IOCTL
 560        int                     (*ndo_do_ioctl)(struct net_device *dev,
 561                                                struct ifreq *ifr, int cmd);
 562#define HAVE_SET_CONFIG
 563        int                     (*ndo_set_config)(struct net_device *dev,
 564                                                  struct ifmap *map);
 565#define HAVE_CHANGE_MTU
 566        int                     (*ndo_change_mtu)(struct net_device *dev,
 567                                                  int new_mtu);
 568        int                     (*ndo_neigh_setup)(struct net_device *dev,
 569                                                   struct neigh_parms *);
 570#define HAVE_TX_TIMEOUT
 571        void                    (*ndo_tx_timeout) (struct net_device *dev);
 572
 573        struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
 574
 575        void                    (*ndo_vlan_rx_register)(struct net_device *dev,
 576                                                        struct vlan_group *grp);
 577        void                    (*ndo_vlan_rx_add_vid)(struct net_device *dev,
 578                                                       unsigned short vid);
 579        void                    (*ndo_vlan_rx_kill_vid)(struct net_device *dev,
 580                                                        unsigned short vid);
 581#ifdef CONFIG_NET_POLL_CONTROLLER
 582#define HAVE_NETDEV_POLL
 583        void                    (*ndo_poll_controller)(struct net_device *dev);
 584#endif
 585};
 586
 587/*
 588 *      The DEVICE structure.
 589 *      Actually, this whole structure is a big mistake.  It mixes I/O
 590 *      data with strictly "high-level" data, and it has to know about
 591 *      almost every data structure used in the INET module.
 592 *
 593 *      FIXME: cleanup struct net_device such that network protocol info
 594 *      moves out.
 595 */
 596
 597struct net_device
 598{
 599
 600        /*
 601         * This is the first field of the "visible" part of this structure
 602         * (i.e. as seen by users in the "Space.c" file).  It is the name
 603         * the interface.
 604         */
 605        char                    name[IFNAMSIZ];
 606        /* device name hash chain */
 607        struct hlist_node       name_hlist;
 608        /* snmp alias */
 609        char                    *ifalias;
 610
 611        /*
 612         *      I/O specific fields
 613         *      FIXME: Merge these and struct ifmap into one
 614         */
 615        unsigned long           mem_end;        /* shared mem end       */
 616        unsigned long           mem_start;      /* shared mem start     */
 617        unsigned long           base_addr;      /* device I/O address   */
 618        unsigned int            irq;            /* device IRQ number    */
 619
 620        /*
 621         *      Some hardware also needs these fields, but they are not
 622         *      part of the usual set specified in Space.c.
 623         */
 624
 625        unsigned char           if_port;        /* Selectable AUI, TP,..*/
 626        unsigned char           dma;            /* DMA channel          */
 627
 628        unsigned long           state;
 629
 630        struct list_head        dev_list;
 631        struct list_head        napi_list;
 632
 633        /* Net device features */
 634        unsigned long           features;
 635#define NETIF_F_SG              1       /* Scatter/gather IO. */
 636#define NETIF_F_IP_CSUM         2       /* Can checksum TCP/UDP over IPv4. */
 637#define NETIF_F_NO_CSUM         4       /* Does not require checksum. F.e. loopack. */
 638#define NETIF_F_HW_CSUM         8       /* Can checksum all the packets. */
 639#define NETIF_F_IPV6_CSUM       16      /* Can checksum TCP/UDP over IPV6 */
 640#define NETIF_F_HIGHDMA         32      /* Can DMA to high memory. */
 641#define NETIF_F_FRAGLIST        64      /* Scatter/gather IO. */
 642#define NETIF_F_HW_VLAN_TX      128     /* Transmit VLAN hw acceleration */
 643#define NETIF_F_HW_VLAN_RX      256     /* Receive VLAN hw acceleration */
 644#define NETIF_F_HW_VLAN_FILTER  512     /* Receive filtering on VLAN */
 645#define NETIF_F_VLAN_CHALLENGED 1024    /* Device cannot handle VLAN packets */
 646#define NETIF_F_GSO             2048    /* Enable software GSO. */
 647#define NETIF_F_LLTX            4096    /* LockLess TX - deprecated. Please */
 648                                        /* do not use LLTX in new drivers */
 649#define NETIF_F_NETNS_LOCAL     8192    /* Does not change network namespaces */
 650#define NETIF_F_GRO             16384   /* Generic receive offload */
 651#define NETIF_F_LRO             32768   /* large receive offload */
 652
 653        /* Segmentation offload features */
 654#define NETIF_F_GSO_SHIFT       16
 655#define NETIF_F_GSO_MASK        0xffff0000
 656#define NETIF_F_TSO             (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
 657#define NETIF_F_UFO             (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
 658#define NETIF_F_GSO_ROBUST      (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
 659#define NETIF_F_TSO_ECN         (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
 660#define NETIF_F_TSO6            (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
 661
 662        /* List of features with software fallbacks. */
 663#define NETIF_F_GSO_SOFTWARE    (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
 664
 665
 666#define NETIF_F_GEN_CSUM        (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
 667#define NETIF_F_V4_CSUM         (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
 668#define NETIF_F_V6_CSUM         (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
 669#define NETIF_F_ALL_CSUM        (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
 670
 671        /*
 672         * If one device supports one of these features, then enable them
 673         * for all in netdev_increment_features.
 674         */
 675#define NETIF_F_ONE_FOR_ALL     (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \
 676                                 NETIF_F_SG | NETIF_F_HIGHDMA |         \
 677                                 NETIF_F_FRAGLIST)
 678
 679        /* Interface index. Unique device identifier    */
 680        int                     ifindex;
 681        int                     iflink;
 682
 683        struct net_device_stats stats;
 684
 685#ifdef CONFIG_WIRELESS_EXT
 686        /* List of functions to handle Wireless Extensions (instead of ioctl).
 687         * See <net/iw_handler.h> for details. Jean II */
 688        const struct iw_handler_def *   wireless_handlers;
 689        /* Instance data managed by the core of Wireless Extensions. */
 690        struct iw_public_data * wireless_data;
 691#endif
 692        /* Management operations */
 693        const struct net_device_ops *netdev_ops;
 694        const struct ethtool_ops *ethtool_ops;
 695
 696        /* Hardware header description */
 697        const struct header_ops *header_ops;
 698
 699        unsigned int            flags;  /* interface flags (a la BSD)   */
 700        unsigned short          gflags;
 701        unsigned short          priv_flags; /* Like 'flags' but invisible to userspace. */
 702        unsigned short          padded; /* How much padding added by alloc_netdev() */
 703
 704        unsigned char           operstate; /* RFC2863 operstate */
 705        unsigned char           link_mode; /* mapping policy to operstate */
 706
 707        unsigned                mtu;    /* interface MTU value          */
 708        unsigned short          type;   /* interface hardware type      */
 709        unsigned short          hard_header_len;        /* hardware hdr length  */
 710
 711        /* extra head- and tailroom the hardware may need, but not in all cases
 712         * can this be guaranteed, especially tailroom. Some cases also use
 713         * LL_MAX_HEADER instead to allocate the skb.
 714         */
 715        unsigned short          needed_headroom;
 716        unsigned short          needed_tailroom;
 717
 718        struct net_device       *master; /* Pointer to master device of a group,
 719                                          * which this device is member of.
 720                                          */
 721
 722        /* Interface address info. */
 723        unsigned char           perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
 724        unsigned char           addr_len;       /* hardware address length      */
 725        unsigned short          dev_id;         /* for shared network cards */
 726
 727        spinlock_t              addr_list_lock;
 728        struct dev_addr_list    *uc_list;       /* Secondary unicast mac addresses */
 729        int                     uc_count;       /* Number of installed ucasts   */
 730        int                     uc_promisc;
 731        struct dev_addr_list    *mc_list;       /* Multicast mac addresses      */
 732        int                     mc_count;       /* Number of installed mcasts   */
 733        unsigned int            promiscuity;
 734        unsigned int            allmulti;
 735
 736
 737        /* Protocol specific pointers */
 738        
 739#ifdef CONFIG_NET_DSA
 740        void                    *dsa_ptr;       /* dsa specific data */
 741#endif
 742        void                    *atalk_ptr;     /* AppleTalk link       */
 743        void                    *ip_ptr;        /* IPv4 specific data   */  
 744        void                    *dn_ptr;        /* DECnet specific data */
 745        void                    *ip6_ptr;       /* IPv6 specific data */
 746        void                    *ec_ptr;        /* Econet specific data */
 747        void                    *ax25_ptr;      /* AX.25 specific data */
 748        struct wireless_dev     *ieee80211_ptr; /* IEEE 802.11 specific data,
 749                                                   assign before registering */
 750
 751/*
 752 * Cache line mostly used on receive path (including eth_type_trans())
 753 */
 754        unsigned long           last_rx;        /* Time of last Rx      */
 755        /* Interface address info used in eth_type_trans() */
 756        unsigned char           dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast 
 757                                                           because most packets are unicast) */
 758
 759        unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
 760
 761        struct netdev_queue     rx_queue;
 762
 763        struct netdev_queue     *_tx ____cacheline_aligned_in_smp;
 764
 765        /* Number of TX queues allocated at alloc_netdev_mq() time  */
 766        unsigned int            num_tx_queues;
 767
 768        /* Number of TX queues currently active in device  */
 769        unsigned int            real_num_tx_queues;
 770
 771        unsigned long           tx_queue_len;   /* Max frames per queue allowed */
 772        spinlock_t              tx_global_lock;
 773/*
 774 * One part is mostly used on xmit path (device)
 775 */
 776        /* These may be needed for future network-power-down code. */
 777        unsigned long           trans_start;    /* Time (in jiffies) of last Tx */
 778
 779        int                     watchdog_timeo; /* used by dev_watchdog() */
 780        struct timer_list       watchdog_timer;
 781
 782        /* Number of references to this device */
 783        atomic_t                refcnt ____cacheline_aligned_in_smp;
 784
 785        /* delayed register/unregister */
 786        struct list_head        todo_list;
 787        /* device index hash chain */
 788        struct hlist_node       index_hlist;
 789
 790        struct net_device       *link_watch_next;
 791
 792        /* register/unregister state machine */
 793        enum { NETREG_UNINITIALIZED=0,
 794               NETREG_REGISTERED,       /* completed register_netdevice */
 795               NETREG_UNREGISTERING,    /* called unregister_netdevice */
 796               NETREG_UNREGISTERED,     /* completed unregister todo */
 797               NETREG_RELEASED,         /* called free_netdev */
 798               NETREG_DUMMY,            /* dummy device for NAPI poll */
 799        } reg_state;
 800
 801        /* Called from unregister, can be used to call free_netdev */
 802        void (*destructor)(struct net_device *dev);
 803
 804#ifdef CONFIG_NETPOLL
 805        struct netpoll_info     *npinfo;
 806#endif
 807
 808#ifdef CONFIG_NET_NS
 809        /* Network namespace this network device is inside */
 810        struct net              *nd_net;
 811#endif
 812
 813        /* mid-layer private */
 814        void                    *ml_priv;
 815
 816        /* bridge stuff */
 817        struct net_bridge_port  *br_port;
 818        /* macvlan */
 819        struct macvlan_port     *macvlan_port;
 820        /* GARP */
 821        struct garp_port        *garp_port;
 822
 823        /* class/net/name entry */
 824        struct device           dev;
 825        /* space for optional statistics and wireless sysfs groups */
 826        struct attribute_group  *sysfs_groups[3];
 827
 828        /* rtnetlink link ops */
 829        const struct rtnl_link_ops *rtnl_link_ops;
 830
 831        /* VLAN feature mask */
 832        unsigned long vlan_features;
 833
 834        /* for setting kernel sock attribute on TCP connection setup */
 835#define GSO_MAX_SIZE            65536
 836        unsigned int            gso_max_size;
 837
 838#ifdef CONFIG_DCB
 839        /* Data Center Bridging netlink ops */
 840        struct dcbnl_rtnl_ops *dcbnl_ops;
 841#endif
 842
 843#ifdef CONFIG_COMPAT_NET_DEV_OPS
 844        struct {
 845                int                     (*init)(struct net_device *dev);
 846                void                    (*uninit)(struct net_device *dev);
 847                int                     (*open)(struct net_device *dev);
 848                int                     (*stop)(struct net_device *dev);
 849                int                     (*hard_start_xmit) (struct sk_buff *skb,
 850                                                            struct net_device *dev);
 851                u16                     (*select_queue)(struct net_device *dev,
 852                                                        struct sk_buff *skb);
 853                void                    (*change_rx_flags)(struct net_device *dev,
 854                                                           int flags);
 855                void                    (*set_rx_mode)(struct net_device *dev);
 856                void                    (*set_multicast_list)(struct net_device *dev);
 857                int                     (*set_mac_address)(struct net_device *dev,
 858                                                           void *addr);
 859                int                     (*validate_addr)(struct net_device *dev);
 860                int                     (*do_ioctl)(struct net_device *dev,
 861                                                    struct ifreq *ifr, int cmd);
 862                int                     (*set_config)(struct net_device *dev,
 863                                                      struct ifmap *map);
 864                int                     (*change_mtu)(struct net_device *dev, int new_mtu);
 865                int                     (*neigh_setup)(struct net_device *dev,
 866                                                       struct neigh_parms *);
 867                void                    (*tx_timeout) (struct net_device *dev);
 868                struct net_device_stats* (*get_stats)(struct net_device *dev);
 869                void                    (*vlan_rx_register)(struct net_device *dev,
 870                                                            struct vlan_group *grp);
 871                void                    (*vlan_rx_add_vid)(struct net_device *dev,
 872                                                           unsigned short vid);
 873                void                    (*vlan_rx_kill_vid)(struct net_device *dev,
 874                                                            unsigned short vid);
 875#ifdef CONFIG_NET_POLL_CONTROLLER
 876                void                    (*poll_controller)(struct net_device *dev);
 877#endif
 878        };
 879#endif
 880};
 881#define to_net_dev(d) container_of(d, struct net_device, dev)
 882
 883#define NETDEV_ALIGN            32
 884#define NETDEV_ALIGN_CONST      (NETDEV_ALIGN - 1)
 885
 886static inline
 887struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
 888                                         unsigned int index)
 889{
 890        return &dev->_tx[index];
 891}
 892
 893static inline void netdev_for_each_tx_queue(struct net_device *dev,
 894                                            void (*f)(struct net_device *,
 895                                                      struct netdev_queue *,
 896                                                      void *),
 897                                            void *arg)
 898{
 899        unsigned int i;
 900
 901        for (i = 0; i < dev->num_tx_queues; i++)
 902                f(dev, &dev->_tx[i], arg);
 903}
 904
 905/*
 906 * Net namespace inlines
 907 */
 908static inline
 909struct net *dev_net(const struct net_device *dev)
 910{
 911#ifdef CONFIG_NET_NS
 912        return dev->nd_net;
 913#else
 914        return &init_net;
 915#endif
 916}
 917
 918static inline
 919void dev_net_set(struct net_device *dev, struct net *net)
 920{
 921#ifdef CONFIG_NET_NS
 922        release_net(dev->nd_net);
 923        dev->nd_net = hold_net(net);
 924#endif
 925}
 926
 927static inline bool netdev_uses_dsa_tags(struct net_device *dev)
 928{
 929#ifdef CONFIG_NET_DSA_TAG_DSA
 930        if (dev->dsa_ptr != NULL)
 931                return dsa_uses_dsa_tags(dev->dsa_ptr);
 932#endif
 933
 934        return 0;
 935}
 936
 937static inline bool netdev_uses_trailer_tags(struct net_device *dev)
 938{
 939#ifdef CONFIG_NET_DSA_TAG_TRAILER
 940        if (dev->dsa_ptr != NULL)
 941                return dsa_uses_trailer_tags(dev->dsa_ptr);
 942#endif
 943
 944        return 0;
 945}
 946
 947/**
 948 *      netdev_priv - access network device private data
 949 *      @dev: network device
 950 *
 951 * Get network device private data
 952 */
 953static inline void *netdev_priv(const struct net_device *dev)
 954{
 955        return (char *)dev + ((sizeof(struct net_device)
 956                               + NETDEV_ALIGN_CONST)
 957                              & ~NETDEV_ALIGN_CONST);
 958}
 959
 960/* Set the sysfs physical device reference for the network logical device
 961 * if set prior to registration will cause a symlink during initialization.
 962 */
 963#define SET_NETDEV_DEV(net, pdev)       ((net)->dev.parent = (pdev))
 964
 965/**
 966 *      netif_napi_add - initialize a napi context
 967 *      @dev:  network device
 968 *      @napi: napi context
 969 *      @poll: polling function
 970 *      @weight: default weight
 971 *
 972 * netif_napi_add() must be used to initialize a napi context prior to calling
 973 * *any* of the other napi related functions.
 974 */
 975void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
 976                    int (*poll)(struct napi_struct *, int), int weight);
 977
 978/**
 979 *  netif_napi_del - remove a napi context
 980 *  @napi: napi context
 981 *
 982 *  netif_napi_del() removes a napi context from the network device napi list
 983 */
 984void netif_napi_del(struct napi_struct *napi);
 985
 986struct napi_gro_cb {
 987        /* This is non-zero if the packet may be of the same flow. */
 988        int same_flow;
 989
 990        /* This is non-zero if the packet cannot be merged with the new skb. */
 991        int flush;
 992
 993        /* Number of segments aggregated. */
 994        int count;
 995
 996        /* Free the skb? */
 997        int free;
 998};
 999
1000#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1001
1002struct packet_type {
1003        __be16                  type;   /* This is really htons(ether_type). */
1004        struct net_device       *dev;   /* NULL is wildcarded here           */
1005        int                     (*func) (struct sk_buff *,
1006                                         struct net_device *,
1007                                         struct packet_type *,
1008                                         struct net_device *);
1009        struct sk_buff          *(*gso_segment)(struct sk_buff *skb,
1010                                                int features);
1011        int                     (*gso_send_check)(struct sk_buff *skb);
1012        struct sk_buff          **(*gro_receive)(struct sk_buff **head,
1013                                               struct sk_buff *skb);
1014        int                     (*gro_complete)(struct sk_buff *skb);
1015        void                    *af_packet_priv;
1016        struct list_head        list;
1017};
1018
1019struct napi_gro_fraginfo {
1020        skb_frag_t frags[MAX_SKB_FRAGS];
1021        unsigned int nr_frags;
1022        unsigned int ip_summed;
1023        unsigned int len;
1024        __wsum csum;
1025};
1026
1027#include <linux/interrupt.h>
1028#include <linux/notifier.h>
1029
1030extern rwlock_t                         dev_base_lock;          /* Device list lock */
1031
1032
1033#define for_each_netdev(net, d)         \
1034                list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1035#define for_each_netdev_safe(net, d, n) \
1036                list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
1037#define for_each_netdev_continue(net, d)                \
1038                list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
1039#define net_device_entry(lh)    list_entry(lh, struct net_device, dev_list)
1040
1041static inline struct net_device *next_net_device(struct net_device *dev)
1042{
1043        struct list_head *lh;
1044        struct net *net;
1045
1046        net = dev_net(dev);
1047        lh = dev->dev_list.next;
1048        return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1049}
1050
1051static inline struct net_device *first_net_device(struct net *net)
1052{
1053        return list_empty(&net->dev_base_head) ? NULL :
1054                net_device_entry(net->dev_base_head.next);
1055}
1056
1057extern int                      netdev_boot_setup_check(struct net_device *dev);
1058extern unsigned long            netdev_boot_base(const char *prefix, int unit);
1059extern struct net_device    *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr);
1060extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
1061extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
1062extern void             dev_add_pack(struct packet_type *pt);
1063extern void             dev_remove_pack(struct packet_type *pt);
1064extern void             __dev_remove_pack(struct packet_type *pt);
1065
1066extern struct net_device        *dev_get_by_flags(struct net *net, unsigned short flags,
1067                                                  unsigned short mask);
1068extern struct net_device        *dev_get_by_name(struct net *net, const char *name);
1069extern struct net_device        *__dev_get_by_name(struct net *net, const char *name);
1070extern int              dev_alloc_name(struct net_device *dev, const char *name);
1071extern int              dev_open(struct net_device *dev);
1072extern int              dev_close(struct net_device *dev);
1073extern void             dev_disable_lro(struct net_device *dev);
1074extern int              dev_queue_xmit(struct sk_buff *skb);
1075extern int              register_netdevice(struct net_device *dev);
1076extern void             unregister_netdevice(struct net_device *dev);
1077extern void             free_netdev(struct net_device *dev);
1078extern void             synchronize_net(void);
1079extern int              register_netdevice_notifier(struct notifier_block *nb);
1080extern int              unregister_netdevice_notifier(struct notifier_block *nb);
1081extern int              init_dummy_netdev(struct net_device *dev);
1082extern void             netdev_resync_ops(struct net_device *dev);
1083
1084extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1085extern struct net_device        *dev_get_by_index(struct net *net, int ifindex);
1086extern struct net_device        *__dev_get_by_index(struct net *net, int ifindex);
1087extern int              dev_restart(struct net_device *dev);
1088#ifdef CONFIG_NETPOLL_TRAP
1089extern int              netpoll_trap(void);
1090#endif
1091
1092static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
1093                                  unsigned short type,
1094                                  const void *daddr, const void *saddr,
1095                                  unsigned len)
1096{
1097        if (!dev->header_ops || !dev->header_ops->create)
1098                return 0;
1099
1100        return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1101}
1102
1103static inline int dev_parse_header(const struct sk_buff *skb,
1104                                   unsigned char *haddr)
1105{
1106        const struct net_device *dev = skb->dev;
1107
1108        if (!dev->header_ops || !dev->header_ops->parse)
1109                return 0;
1110        return dev->header_ops->parse(skb, haddr);
1111}
1112
1113typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
1114extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
1115static inline int unregister_gifconf(unsigned int family)
1116{
1117        return register_gifconf(family, NULL);
1118}
1119
1120/*
1121 * Incoming packets are placed on per-cpu queues so that
1122 * no locking is needed.
1123 */
1124struct softnet_data
1125{
1126        struct Qdisc            *output_queue;
1127        struct sk_buff_head     input_pkt_queue;
1128        struct list_head        poll_list;
1129        struct sk_buff          *completion_queue;
1130
1131        struct napi_struct      backlog;
1132};
1133
1134DECLARE_PER_CPU(struct softnet_data,softnet_data);
1135
1136#define HAVE_NETIF_QUEUE
1137
1138extern void __netif_schedule(struct Qdisc *q);
1139
1140static inline void netif_schedule_queue(struct netdev_queue *txq)
1141{
1142        if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1143                __netif_schedule(txq->qdisc);
1144}
1145
1146static inline void netif_tx_schedule_all(struct net_device *dev)
1147{
1148        unsigned int i;
1149
1150        for (i = 0; i < dev->num_tx_queues; i++)
1151                netif_schedule_queue(netdev_get_tx_queue(dev, i));
1152}
1153
1154static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
1155{
1156        clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1157}
1158
1159/**
1160 *      netif_start_queue - allow transmit
1161 *      @dev: network device
1162 *
1163 *      Allow upper layers to call the device hard_start_xmit routine.
1164 */
1165static inline void netif_start_queue(struct net_device *dev)
1166{
1167        netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
1168}
1169
1170static inline void netif_tx_start_all_queues(struct net_device *dev)
1171{
1172        unsigned int i;
1173
1174        for (i = 0; i < dev->num_tx_queues; i++) {
1175                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1176                netif_tx_start_queue(txq);
1177        }
1178}
1179
1180static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
1181{
1182#ifdef CONFIG_NETPOLL_TRAP
1183        if (netpoll_trap()) {
1184                clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1185                return;
1186        }
1187#endif
1188        if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
1189                __netif_schedule(dev_queue->qdisc);
1190}
1191
1192/**
1193 *      netif_wake_queue - restart transmit
1194 *      @dev: network device
1195 *
1196 *      Allow upper layers to call the device hard_start_xmit routine.
1197 *      Used for flow control when transmit resources are available.
1198 */
1199static inline void netif_wake_queue(struct net_device *dev)
1200{
1201        netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
1202}
1203
1204static inline void netif_tx_wake_all_queues(struct net_device *dev)
1205{
1206        unsigned int i;
1207
1208        for (i = 0; i < dev->num_tx_queues; i++) {
1209                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1210                netif_tx_wake_queue(txq);
1211        }
1212}
1213
1214static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
1215{
1216        set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1217}
1218
1219/**
1220 *      netif_stop_queue - stop transmitted packets
1221 *      @dev: network device
1222 *
1223 *      Stop upper layers calling the device hard_start_xmit routine.
1224 *      Used for flow control when transmit resources are unavailable.
1225 */
1226static inline void netif_stop_queue(struct net_device *dev)
1227{
1228        netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
1229}
1230
1231static inline void netif_tx_stop_all_queues(struct net_device *dev)
1232{
1233        unsigned int i;
1234
1235        for (i = 0; i < dev->num_tx_queues; i++) {
1236                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1237                netif_tx_stop_queue(txq);
1238        }
1239}
1240
1241static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
1242{
1243        return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1244}
1245
1246/**
1247 *      netif_queue_stopped - test if transmit queue is flowblocked
1248 *      @dev: network device
1249 *
1250 *      Test if transmit queue on device is currently unable to send.
1251 */
1252static inline int netif_queue_stopped(const struct net_device *dev)
1253{
1254        return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
1255}
1256
1257static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue)
1258{
1259        return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state);
1260}
1261
1262/**
1263 *      netif_running - test if up
1264 *      @dev: network device
1265 *
1266 *      Test if the device has been brought up.
1267 */
1268static inline int netif_running(const struct net_device *dev)
1269{
1270        return test_bit(__LINK_STATE_START, &dev->state);
1271}
1272
1273/*
1274 * Routines to manage the subqueues on a device.  We only need start
1275 * stop, and a check if it's stopped.  All other device management is
1276 * done at the overall netdevice level.
1277 * Also test the device if we're multiqueue.
1278 */
1279
1280/**
1281 *      netif_start_subqueue - allow sending packets on subqueue
1282 *      @dev: network device
1283 *      @queue_index: sub queue index
1284 *
1285 * Start individual transmit queue of a device with multiple transmit queues.
1286 */
1287static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
1288{
1289        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1290        clear_bit(__QUEUE_STATE_XOFF, &txq->state);
1291}
1292
1293/**
1294 *      netif_stop_subqueue - stop sending packets on subqueue
1295 *      @dev: network device
1296 *      @queue_index: sub queue index
1297 *
1298 * Stop individual transmit queue of a device with multiple transmit queues.
1299 */
1300static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
1301{
1302        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1303#ifdef CONFIG_NETPOLL_TRAP
1304        if (netpoll_trap())
1305                return;
1306#endif
1307        set_bit(__QUEUE_STATE_XOFF, &txq->state);
1308}
1309
1310/**
1311 *      netif_subqueue_stopped - test status of subqueue
1312 *      @dev: network device
1313 *      @queue_index: sub queue index
1314 *
1315 * Check individual transmit queue of a device with multiple transmit queues.
1316 */
1317static inline int __netif_subqueue_stopped(const struct net_device *dev,
1318                                         u16 queue_index)
1319{
1320        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1321        return test_bit(__QUEUE_STATE_XOFF, &txq->state);
1322}
1323
1324static inline int netif_subqueue_stopped(const struct net_device *dev,
1325                                         struct sk_buff *skb)
1326{
1327        return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
1328}
1329
1330/**
1331 *      netif_wake_subqueue - allow sending packets on subqueue
1332 *      @dev: network device
1333 *      @queue_index: sub queue index
1334 *
1335 * Resume individual transmit queue of a device with multiple transmit queues.
1336 */
1337static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
1338{
1339        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1340#ifdef CONFIG_NETPOLL_TRAP
1341        if (netpoll_trap())
1342                return;
1343#endif
1344        if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state))
1345                __netif_schedule(txq->qdisc);
1346}
1347
1348/**
1349 *      netif_is_multiqueue - test if device has multiple transmit queues
1350 *      @dev: network device
1351 *
1352 * Check if device has multiple transmit queues
1353 */
1354static inline int netif_is_multiqueue(const struct net_device *dev)
1355{
1356        return (dev->num_tx_queues > 1);
1357}
1358
1359/* Use this variant when it is known for sure that it
1360 * is executing from hardware interrupt context or with hardware interrupts
1361 * disabled.
1362 */
1363extern void dev_kfree_skb_irq(struct sk_buff *skb);
1364
1365/* Use this variant in places where it could be invoked
1366 * from either hardware interrupt or other context, with hardware interrupts
1367 * either disabled or enabled.
1368 */
1369extern void dev_kfree_skb_any(struct sk_buff *skb);
1370
1371#define HAVE_NETIF_RX 1
1372extern int              netif_rx(struct sk_buff *skb);
1373extern int              netif_rx_ni(struct sk_buff *skb);
1374#define HAVE_NETIF_RECEIVE_SKB 1
1375extern int              netif_receive_skb(struct sk_buff *skb);
1376extern void             napi_gro_flush(struct napi_struct *napi);
1377extern int              dev_gro_receive(struct napi_struct *napi,
1378                                        struct sk_buff *skb);
1379extern int              napi_gro_receive(struct napi_struct *napi,
1380                                         struct sk_buff *skb);
1381extern void             napi_reuse_skb(struct napi_struct *napi,
1382                                       struct sk_buff *skb);
1383extern struct sk_buff * napi_fraginfo_skb(struct napi_struct *napi,
1384                                          struct napi_gro_fraginfo *info);
1385extern int              napi_gro_frags(struct napi_struct *napi,
1386                                       struct napi_gro_fraginfo *info);
1387extern void             netif_nit_deliver(struct sk_buff *skb);
1388extern int              dev_valid_name(const char *name);
1389extern int              dev_ioctl(struct net *net, unsigned int cmd, void __user *);
1390extern int              dev_ethtool(struct net *net, struct ifreq *);
1391extern unsigned         dev_get_flags(const struct net_device *);
1392extern int              dev_change_flags(struct net_device *, unsigned);
1393extern int              dev_change_name(struct net_device *, const char *);
1394extern int              dev_set_alias(struct net_device *, const char *, size_t);
1395extern int              dev_change_net_namespace(struct net_device *,
1396                                                 struct net *, const char *);
1397extern int              dev_set_mtu(struct net_device *, int);
1398extern int              dev_set_mac_address(struct net_device *,
1399                                            struct sockaddr *);
1400extern int              dev_hard_start_xmit(struct sk_buff *skb,
1401                                            struct net_device *dev,
1402                                            struct netdev_queue *txq);
1403
1404extern int              netdev_budget;
1405
1406/* Called by rtnetlink.c:rtnl_unlock() */
1407extern void netdev_run_todo(void);
1408
1409/**
1410 *      dev_put - release reference to device
1411 *      @dev: network device
1412 *
1413 * Release reference to device to allow it to be freed.
1414 */
1415static inline void dev_put(struct net_device *dev)
1416{
1417        atomic_dec(&dev->refcnt);
1418}
1419
1420/**
1421 *      dev_hold - get reference to device
1422 *      @dev: network device
1423 *
1424 * Hold reference to device to keep it from being freed.
1425 */
1426static inline void dev_hold(struct net_device *dev)
1427{
1428        atomic_inc(&dev->refcnt);
1429}
1430
1431/* Carrier loss detection, dial on demand. The functions netif_carrier_on
1432 * and _off may be called from IRQ context, but it is caller
1433 * who is responsible for serialization of these calls.
1434 *
1435 * The name carrier is inappropriate, these functions should really be
1436 * called netif_lowerlayer_*() because they represent the state of any
1437 * kind of lower layer not just hardware media.
1438 */
1439
1440extern void linkwatch_fire_event(struct net_device *dev);
1441
1442/**
1443 *      netif_carrier_ok - test if carrier present
1444 *      @dev: network device
1445 *
1446 * Check if carrier is present on device
1447 */
1448static inline int netif_carrier_ok(const struct net_device *dev)
1449{
1450        return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
1451}
1452
1453extern void __netdev_watchdog_up(struct net_device *dev);
1454
1455extern void netif_carrier_on(struct net_device *dev);
1456
1457extern void netif_carrier_off(struct net_device *dev);
1458
1459/**
1460 *      netif_dormant_on - mark device as dormant.
1461 *      @dev: network device
1462 *
1463 * Mark device as dormant (as per RFC2863).
1464 *
1465 * The dormant state indicates that the relevant interface is not
1466 * actually in a condition to pass packets (i.e., it is not 'up') but is
1467 * in a "pending" state, waiting for some external event.  For "on-
1468 * demand" interfaces, this new state identifies the situation where the
1469 * interface is waiting for events to place it in the up state.
1470 *
1471 */
1472static inline void netif_dormant_on(struct net_device *dev)
1473{
1474        if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
1475                linkwatch_fire_event(dev);
1476}
1477
1478/**
1479 *      netif_dormant_off - set device as not dormant.
1480 *      @dev: network device
1481 *
1482 * Device is not in dormant state.
1483 */
1484static inline void netif_dormant_off(struct net_device *dev)
1485{
1486        if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
1487                linkwatch_fire_event(dev);
1488}
1489
1490/**
1491 *      netif_dormant - test if carrier present
1492 *      @dev: network device
1493 *
1494 * Check if carrier is present on device
1495 */
1496static inline int netif_dormant(const struct net_device *dev)
1497{
1498        return test_bit(__LINK_STATE_DORMANT, &dev->state);
1499}
1500
1501
1502/**
1503 *      netif_oper_up - test if device is operational
1504 *      @dev: network device
1505 *
1506 * Check if carrier is operational
1507 */
1508static inline int netif_oper_up(const struct net_device *dev) {
1509        return (dev->operstate == IF_OPER_UP ||
1510                dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
1511}
1512
1513/**
1514 *      netif_device_present - is device available or removed
1515 *      @dev: network device
1516 *
1517 * Check if device has not been removed from system.
1518 */
1519static inline int netif_device_present(struct net_device *dev)
1520{
1521        return test_bit(__LINK_STATE_PRESENT, &dev->state);
1522}
1523
1524extern void netif_device_detach(struct net_device *dev);
1525
1526extern void netif_device_attach(struct net_device *dev);
1527
1528/*
1529 * Network interface message level settings
1530 */
1531#define HAVE_NETIF_MSG 1
1532
1533enum {
1534        NETIF_MSG_DRV           = 0x0001,
1535        NETIF_MSG_PROBE         = 0x0002,
1536        NETIF_MSG_LINK          = 0x0004,
1537        NETIF_MSG_TIMER         = 0x0008,
1538        NETIF_MSG_IFDOWN        = 0x0010,
1539        NETIF_MSG_IFUP          = 0x0020,
1540        NETIF_MSG_RX_ERR        = 0x0040,
1541        NETIF_MSG_TX_ERR        = 0x0080,
1542        NETIF_MSG_TX_QUEUED     = 0x0100,
1543        NETIF_MSG_INTR          = 0x0200,
1544        NETIF_MSG_TX_DONE       = 0x0400,
1545        NETIF_MSG_RX_STATUS     = 0x0800,
1546        NETIF_MSG_PKTDATA       = 0x1000,
1547        NETIF_MSG_HW            = 0x2000,
1548        NETIF_MSG_WOL           = 0x4000,
1549};
1550
1551#define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
1552#define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
1553#define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
1554#define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
1555#define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
1556#define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
1557#define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
1558#define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
1559#define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
1560#define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
1561#define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
1562#define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
1563#define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
1564#define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
1565#define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
1566
1567static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
1568{
1569        /* use default */
1570        if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
1571                return default_msg_enable_bits;
1572        if (debug_value == 0)   /* no output */
1573                return 0;
1574        /* set low N bits */
1575        return (1 << debug_value) - 1;
1576}
1577
1578/* Test if receive needs to be scheduled but only if up */
1579static inline int netif_rx_schedule_prep(struct napi_struct *napi)
1580{
1581        return napi_schedule_prep(napi);
1582}
1583
1584/* Add interface to tail of rx poll list. This assumes that _prep has
1585 * already been called and returned 1.
1586 */
1587static inline void __netif_rx_schedule(struct napi_struct *napi)
1588{
1589        __napi_schedule(napi);
1590}
1591
1592/* Try to reschedule poll. Called by irq handler. */
1593
1594static inline void netif_rx_schedule(struct napi_struct *napi)
1595{
1596        if (netif_rx_schedule_prep(napi))
1597                __netif_rx_schedule(napi);
1598}
1599
1600/* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().  */
1601static inline int netif_rx_reschedule(struct napi_struct *napi)
1602{
1603        if (napi_schedule_prep(napi)) {
1604                __netif_rx_schedule(napi);
1605                return 1;
1606        }
1607        return 0;
1608}
1609
1610/* same as netif_rx_complete, except that local_irq_save(flags)
1611 * has already been issued
1612 */
1613static inline void __netif_rx_complete(struct napi_struct *napi)
1614{
1615        __napi_complete(napi);
1616}
1617
1618/* Remove interface from poll list: it must be in the poll list
1619 * on current cpu. This primitive is called by dev->poll(), when
1620 * it completes the work. The device cannot be out of poll list at this
1621 * moment, it is BUG().
1622 */
1623static inline void netif_rx_complete(struct napi_struct *napi)
1624{
1625        napi_complete(napi);
1626}
1627
1628static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
1629{
1630        spin_lock(&txq->_xmit_lock);
1631        txq->xmit_lock_owner = cpu;
1632}
1633
1634static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
1635{
1636        spin_lock_bh(&txq->_xmit_lock);
1637        txq->xmit_lock_owner = smp_processor_id();
1638}
1639
1640static inline int __netif_tx_trylock(struct netdev_queue *txq)
1641{
1642        int ok = spin_trylock(&txq->_xmit_lock);
1643        if (likely(ok))
1644                txq->xmit_lock_owner = smp_processor_id();
1645        return ok;
1646}
1647
1648static inline void __netif_tx_unlock(struct netdev_queue *txq)
1649{
1650        txq->xmit_lock_owner = -1;
1651        spin_unlock(&txq->_xmit_lock);
1652}
1653
1654static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
1655{
1656        txq->xmit_lock_owner = -1;
1657        spin_unlock_bh(&txq->_xmit_lock);
1658}
1659
1660/**
1661 *      netif_tx_lock - grab network device transmit lock
1662 *      @dev: network device
1663 *
1664 * Get network device transmit lock
1665 */
1666static inline void netif_tx_lock(struct net_device *dev)
1667{
1668        unsigned int i;
1669        int cpu;
1670
1671        spin_lock(&dev->tx_global_lock);
1672        cpu = smp_processor_id();
1673        for (i = 0; i < dev->num_tx_queues; i++) {
1674                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1675
1676                /* We are the only thread of execution doing a
1677                 * freeze, but we have to grab the _xmit_lock in
1678                 * order to synchronize with threads which are in
1679                 * the ->hard_start_xmit() handler and already
1680                 * checked the frozen bit.
1681                 */
1682                __netif_tx_lock(txq, cpu);
1683                set_bit(__QUEUE_STATE_FROZEN, &txq->state);
1684                __netif_tx_unlock(txq);
1685        }
1686}
1687
1688static inline void netif_tx_lock_bh(struct net_device *dev)
1689{
1690        local_bh_disable();
1691        netif_tx_lock(dev);
1692}
1693
1694static inline void netif_tx_unlock(struct net_device *dev)
1695{
1696        unsigned int i;
1697
1698        for (i = 0; i < dev->num_tx_queues; i++) {
1699                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1700
1701                /* No need to grab the _xmit_lock here.  If the
1702                 * queue is not stopped for another reason, we
1703                 * force a schedule.
1704                 */
1705                clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
1706                if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1707                        __netif_schedule(txq->qdisc);
1708        }
1709        spin_unlock(&dev->tx_global_lock);
1710}
1711
1712static inline void netif_tx_unlock_bh(struct net_device *dev)
1713{
1714        netif_tx_unlock(dev);
1715        local_bh_enable();
1716}
1717
1718#define HARD_TX_LOCK(dev, txq, cpu) {                   \
1719        if ((dev->features & NETIF_F_LLTX) == 0) {      \
1720                __netif_tx_lock(txq, cpu);              \
1721        }                                               \
1722}
1723
1724#define HARD_TX_UNLOCK(dev, txq) {                      \
1725        if ((dev->features & NETIF_F_LLTX) == 0) {      \
1726                __netif_tx_unlock(txq);                 \
1727        }                                               \
1728}
1729
1730static inline void netif_tx_disable(struct net_device *dev)
1731{
1732        unsigned int i;
1733        int cpu;
1734
1735        local_bh_disable();
1736        cpu = smp_processor_id();
1737        for (i = 0; i < dev->num_tx_queues; i++) {
1738                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1739
1740                __netif_tx_lock(txq, cpu);
1741                netif_tx_stop_queue(txq);
1742                __netif_tx_unlock(txq);
1743        }
1744        local_bh_enable();
1745}
1746
1747static inline void netif_addr_lock(struct net_device *dev)
1748{
1749        spin_lock(&dev->addr_list_lock);
1750}
1751
1752static inline void netif_addr_lock_bh(struct net_device *dev)
1753{
1754        spin_lock_bh(&dev->addr_list_lock);
1755}
1756
1757static inline void netif_addr_unlock(struct net_device *dev)
1758{
1759        spin_unlock(&dev->addr_list_lock);
1760}
1761
1762static inline void netif_addr_unlock_bh(struct net_device *dev)
1763{
1764        spin_unlock_bh(&dev->addr_list_lock);
1765}
1766
1767/* These functions live elsewhere (drivers/net/net_init.c, but related) */
1768
1769extern void             ether_setup(struct net_device *dev);
1770
1771/* Support for loadable net-drivers */
1772extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
1773                                       void (*setup)(struct net_device *),
1774                                       unsigned int queue_count);
1775#define alloc_netdev(sizeof_priv, name, setup) \
1776        alloc_netdev_mq(sizeof_priv, name, setup, 1)
1777extern int              register_netdev(struct net_device *dev);
1778extern void             unregister_netdev(struct net_device *dev);
1779/* Functions used for secondary unicast and multicast support */
1780extern void             dev_set_rx_mode(struct net_device *dev);
1781extern void             __dev_set_rx_mode(struct net_device *dev);
1782extern int              dev_unicast_delete(struct net_device *dev, void *addr, int alen);
1783extern int              dev_unicast_add(struct net_device *dev, void *addr, int alen);
1784extern int              dev_unicast_sync(struct net_device *to, struct net_device *from);
1785extern void             dev_unicast_unsync(struct net_device *to, struct net_device *from);
1786extern int              dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
1787extern int              dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
1788extern int              dev_mc_sync(struct net_device *to, struct net_device *from);
1789extern void             dev_mc_unsync(struct net_device *to, struct net_device *from);
1790extern int              __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all);
1791extern int              __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly);
1792extern int              __dev_addr_sync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count);
1793extern void             __dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count);
1794extern int              dev_set_promiscuity(struct net_device *dev, int inc);
1795extern int              dev_set_allmulti(struct net_device *dev, int inc);
1796extern void             netdev_state_change(struct net_device *dev);
1797extern void             netdev_bonding_change(struct net_device *dev);
1798extern void             netdev_features_change(struct net_device *dev);
1799/* Load a device via the kmod */
1800extern void             dev_load(struct net *net, const char *name);
1801extern void             dev_mcast_init(void);
1802extern const struct net_device_stats *dev_get_stats(struct net_device *dev);
1803
1804extern int              netdev_max_backlog;
1805extern int              weight_p;
1806extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
1807extern int skb_checksum_help(struct sk_buff *skb);
1808extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
1809#ifdef CONFIG_BUG
1810extern void netdev_rx_csum_fault(struct net_device *dev);
1811#else
1812static inline void netdev_rx_csum_fault(struct net_device *dev)
1813{
1814}
1815#endif
1816/* rx skb timestamps */
1817extern void             net_enable_timestamp(void);
1818extern void             net_disable_timestamp(void);
1819
1820#ifdef CONFIG_PROC_FS
1821extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
1822extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
1823extern void dev_seq_stop(struct seq_file *seq, void *v);
1824#endif
1825
1826extern int netdev_class_create_file(struct class_attribute *class_attr);
1827extern void netdev_class_remove_file(struct class_attribute *class_attr);
1828
1829extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len);
1830
1831extern void linkwatch_run_queue(void);
1832
1833unsigned long netdev_increment_features(unsigned long all, unsigned long one,
1834                                        unsigned long mask);
1835unsigned long netdev_fix_features(unsigned long features, const char *name);
1836
1837static inline int net_gso_ok(int features, int gso_type)
1838{
1839        int feature = gso_type << NETIF_F_GSO_SHIFT;
1840        return (features & feature) == feature;
1841}
1842
1843static inline int skb_gso_ok(struct sk_buff *skb, int features)
1844{
1845        return net_gso_ok(features, skb_shinfo(skb)->gso_type);
1846}
1847
1848static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
1849{
1850        return skb_is_gso(skb) &&
1851               (!skb_gso_ok(skb, dev->features) ||
1852                (skb_shinfo(skb)->frag_list &&
1853                 !(dev->features & NETIF_F_FRAGLIST)) ||
1854                unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
1855}
1856
1857static inline void netif_set_gso_max_size(struct net_device *dev,
1858                                          unsigned int size)
1859{
1860        dev->gso_max_size = size;
1861}
1862
1863/* On bonding slaves other than the currently active slave, suppress
1864 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
1865 * ARP on active-backup slaves with arp_validate enabled.
1866 */
1867static inline int skb_bond_should_drop(struct sk_buff *skb)
1868{
1869        struct net_device *dev = skb->dev;
1870        struct net_device *master = dev->master;
1871
1872        if (master) {
1873                if (master->priv_flags & IFF_MASTER_ARPMON)
1874                        dev->last_rx = jiffies;
1875
1876                if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
1877                        if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
1878                            skb->protocol == __constant_htons(ETH_P_ARP))
1879                                return 0;
1880
1881                        if (master->priv_flags & IFF_MASTER_ALB) {
1882                                if (skb->pkt_type != PACKET_BROADCAST &&
1883                                    skb->pkt_type != PACKET_MULTICAST)
1884                                        return 0;
1885                        }
1886                        if (master->priv_flags & IFF_MASTER_8023AD &&
1887                            skb->protocol == __constant_htons(ETH_P_SLOW))
1888                                return 0;
1889
1890                        return 1;
1891                }
1892        }
1893        return 0;
1894}
1895
1896extern struct pernet_operations __net_initdata loopback_net_ops;
1897#endif /* __KERNEL__ */
1898
1899#endif  /* _LINUX_DEV_H */
1900
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