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#include <linux/if_link.h>
  32
  33#ifdef __KERNEL__
  34#include <linux/pm_qos_params.h>
  35#include <linux/timer.h>
  36#include <linux/delay.h>
  37#include <linux/mm.h>
  38#include <asm/atomic.h>
  39#include <asm/cache.h>
  40#include <asm/byteorder.h>
  41
  42#include <linux/device.h>
  43#include <linux/percpu.h>
  44#include <linux/rculist.h>
  45#include <linux/dmaengine.h>
  46#include <linux/workqueue.h>
  47
  48#include <linux/ethtool.h>
  49#include <net/net_namespace.h>
  50#include <net/dsa.h>
  51#ifdef CONFIG_DCB
  52#include <net/dcbnl.h>
  53#endif
  54
  55struct vlan_group;
  56struct netpoll_info;
  57/* 802.11 specific */
  58struct wireless_dev;
  59                                        /* source back-compat hooks */
  60#define SET_ETHTOOL_OPS(netdev,ops) \
  61        ( (netdev)->ethtool_ops = (ops) )
  62
  63#define HAVE_ALLOC_NETDEV               /* feature macro: alloc_xxxdev
  64                                           functions are available. */
  65#define HAVE_FREE_NETDEV                /* free_netdev() */
  66#define HAVE_NETDEV_PRIV                /* netdev_priv() */
  67
  68/* Backlog congestion levels */
  69#define NET_RX_SUCCESS          0       /* keep 'em coming, baby */
  70#define NET_RX_DROP             1       /* packet dropped */
  71
  72/*
  73 * Transmit return codes: transmit return codes originate from three different
  74 * namespaces:
  75 *
  76 * - qdisc return codes
  77 * - driver transmit return codes
  78 * - errno values
  79 *
  80 * Drivers are allowed to return any one of those in their hard_start_xmit()
  81 * function. Real network devices commonly used with qdiscs should only return
  82 * the driver transmit return codes though - when qdiscs are used, the actual
  83 * transmission happens asynchronously, so the value is not propagated to
  84 * higher layers. Virtual network devices transmit synchronously, in this case
  85 * the driver transmit return codes are consumed by dev_queue_xmit(), all
  86 * others are propagated to higher layers.
  87 */
  88
  89/* qdisc ->enqueue() return codes. */
  90#define NET_XMIT_SUCCESS        0x00
  91#define NET_XMIT_DROP           0x01    /* skb dropped                  */
  92#define NET_XMIT_CN             0x02    /* congestion notification      */
  93#define NET_XMIT_POLICED        0x03    /* skb is shot by police        */
  94#define NET_XMIT_MASK           0x0f    /* qdisc flags in net/sch_generic.h */
  95
  96/* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
  97 * indicates that the device will soon be dropping packets, or already drops
  98 * some packets of the same priority; prompting us to send less aggressively. */
  99#define net_xmit_eval(e)        ((e) == NET_XMIT_CN ? 0 : (e))
 100#define net_xmit_errno(e)       ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
 101
 102/* Driver transmit return codes */
 103#define NETDEV_TX_MASK          0xf0
 104
 105enum netdev_tx {
 106        __NETDEV_TX_MIN  = INT_MIN,     /* make sure enum is signed */
 107        NETDEV_TX_OK     = 0x00,        /* driver took care of packet */
 108        NETDEV_TX_BUSY   = 0x10,        /* driver tx path was busy*/
 109        NETDEV_TX_LOCKED = 0x20,        /* driver tx lock was already taken */
 110};
 111typedef enum netdev_tx netdev_tx_t;
 112
 113/*
 114 * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant;
 115 * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed.
 116 */
 117static inline bool dev_xmit_complete(int rc)
 118{
 119        /*
 120         * Positive cases with an skb consumed by a driver:
 121         * - successful transmission (rc == NETDEV_TX_OK)
 122         * - error while transmitting (rc < 0)
 123         * - error while queueing to a different device (rc & NET_XMIT_MASK)
 124         */
 125        if (likely(rc < NET_XMIT_MASK))
 126                return true;
 127
 128        return false;
 129}
 130
 131#endif
 132
 133#define MAX_ADDR_LEN    32              /* Largest hardware address length */
 134
 135#ifdef  __KERNEL__
 136/*
 137 *      Compute the worst case header length according to the protocols
 138 *      used.
 139 */
 140
 141#if defined(CONFIG_WLAN) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
 142# if defined(CONFIG_MAC80211_MESH)
 143#  define LL_MAX_HEADER 128
 144# else
 145#  define LL_MAX_HEADER 96
 146# endif
 147#elif defined(CONFIG_TR) || defined(CONFIG_TR_MODULE)
 148# define LL_MAX_HEADER 48
 149#else
 150# define LL_MAX_HEADER 32
 151#endif
 152
 153#if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \
 154    !defined(CONFIG_NET_IPGRE) &&  !defined(CONFIG_NET_IPGRE_MODULE) && \
 155    !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \
 156    !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE)
 157#define MAX_HEADER LL_MAX_HEADER
 158#else
 159#define MAX_HEADER (LL_MAX_HEADER + 48)
 160#endif
 161
 162#endif  /*  __KERNEL__  */
 163
 164/*
 165 *      Network device statistics. Akin to the 2.0 ether stats but
 166 *      with byte counters.
 167 */
 168
 169struct net_device_stats {
 170        unsigned long   rx_packets;             /* total packets received       */
 171        unsigned long   tx_packets;             /* total packets transmitted    */
 172        unsigned long   rx_bytes;               /* total bytes received         */
 173        unsigned long   tx_bytes;               /* total bytes transmitted      */
 174        unsigned long   rx_errors;              /* bad packets received         */
 175        unsigned long   tx_errors;              /* packet transmit problems     */
 176        unsigned long   rx_dropped;             /* no space in linux buffers    */
 177        unsigned long   tx_dropped;             /* no space available in linux  */
 178        unsigned long   multicast;              /* multicast packets received   */
 179        unsigned long   collisions;
 180
 181        /* detailed rx_errors: */
 182        unsigned long   rx_length_errors;
 183        unsigned long   rx_over_errors;         /* receiver ring buff overflow  */
 184        unsigned long   rx_crc_errors;          /* recved pkt with crc error    */
 185        unsigned long   rx_frame_errors;        /* recv'd frame alignment error */
 186        unsigned long   rx_fifo_errors;         /* recv'r fifo overrun          */
 187        unsigned long   rx_missed_errors;       /* receiver missed packet       */
 188
 189        /* detailed tx_errors */
 190        unsigned long   tx_aborted_errors;
 191        unsigned long   tx_carrier_errors;
 192        unsigned long   tx_fifo_errors;
 193        unsigned long   tx_heartbeat_errors;
 194        unsigned long   tx_window_errors;
 195        
 196        /* for cslip etc */
 197        unsigned long   rx_compressed;
 198        unsigned long   tx_compressed;
 199};
 200
 201
 202/* Media selection options. */
 203enum {
 204        IF_PORT_UNKNOWN = 0,
 205        IF_PORT_10BASE2,
 206        IF_PORT_10BASET,
 207        IF_PORT_AUI,
 208        IF_PORT_100BASET,
 209        IF_PORT_100BASETX,
 210        IF_PORT_100BASEFX
 211};
 212
 213#ifdef __KERNEL__
 214
 215#include <linux/cache.h>
 216#include <linux/skbuff.h>
 217
 218struct neighbour;
 219struct neigh_parms;
 220struct sk_buff;
 221
 222struct netdev_hw_addr {
 223        struct list_head        list;
 224        unsigned char           addr[MAX_ADDR_LEN];
 225        unsigned char           type;
 226#define NETDEV_HW_ADDR_T_LAN            1
 227#define NETDEV_HW_ADDR_T_SAN            2
 228#define NETDEV_HW_ADDR_T_SLAVE          3
 229#define NETDEV_HW_ADDR_T_UNICAST        4
 230#define NETDEV_HW_ADDR_T_MULTICAST      5
 231        int                     refcount;
 232        bool                    synced;
 233        bool                    global_use;
 234        struct rcu_head         rcu_head;
 235};
 236
 237struct netdev_hw_addr_list {
 238        struct list_head        list;
 239        int                     count;
 240};
 241
 242#define netdev_hw_addr_list_count(l) ((l)->count)
 243#define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0)
 244#define netdev_hw_addr_list_for_each(ha, l) \
 245        list_for_each_entry(ha, &(l)->list, list)
 246
 247#define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc)
 248#define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc)
 249#define netdev_for_each_uc_addr(ha, dev) \
 250        netdev_hw_addr_list_for_each(ha, &(dev)->uc)
 251
 252#define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc)
 253#define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc)
 254#define netdev_for_each_mc_addr(ha, dev) \
 255        netdev_hw_addr_list_for_each(ha, &(dev)->mc)
 256
 257struct hh_cache {
 258        struct hh_cache *hh_next;       /* Next entry                        */
 259        atomic_t        hh_refcnt;      /* number of users                   */
 260/*
 261 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate
 262 * cache line on SMP.
 263 * They are mostly read, but hh_refcnt may be changed quite frequently,
 264 * incurring cache line ping pongs.
 265 */
 266        __be16          hh_type ____cacheline_aligned_in_smp;
 267                                        /* protocol identifier, f.e ETH_P_IP
 268                                         *  NOTE:  For VLANs, this will be the
 269                                         *  encapuslated type. --BLG
 270                                         */
 271        u16             hh_len;         /* length of header */
 272        int             (*hh_output)(struct sk_buff *skb);
 273        seqlock_t       hh_lock;
 274
 275        /* cached hardware header; allow for machine alignment needs.        */
 276#define HH_DATA_MOD     16
 277#define HH_DATA_OFF(__len) \
 278        (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
 279#define HH_DATA_ALIGN(__len) \
 280        (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
 281        unsigned long   hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
 282};
 283
 284/* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
 285 * Alternative is:
 286 *   dev->hard_header_len ? (dev->hard_header_len +
 287 *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
 288 *
 289 * We could use other alignment values, but we must maintain the
 290 * relationship HH alignment <= LL alignment.
 291 *
 292 * LL_ALLOCATED_SPACE also takes into account the tailroom the device
 293 * may need.
 294 */
 295#define LL_RESERVED_SPACE(dev) \
 296        ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 297#define LL_RESERVED_SPACE_EXTRA(dev,extra) \
 298        ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 299#define LL_ALLOCATED_SPACE(dev) \
 300        ((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 301
 302struct header_ops {
 303        int     (*create) (struct sk_buff *skb, struct net_device *dev,
 304                           unsigned short type, const void *daddr,
 305                           const void *saddr, unsigned len);
 306        int     (*parse)(const struct sk_buff *skb, unsigned char *haddr);
 307        int     (*rebuild)(struct sk_buff *skb);
 308#define HAVE_HEADER_CACHE
 309        int     (*cache)(const struct neighbour *neigh, struct hh_cache *hh);
 310        void    (*cache_update)(struct hh_cache *hh,
 311                                const struct net_device *dev,
 312                                const unsigned char *haddr);
 313};
 314
 315/* These flag bits are private to the generic network queueing
 316 * layer, they may not be explicitly referenced by any other
 317 * code.
 318 */
 319
 320enum netdev_state_t {
 321        __LINK_STATE_START,
 322        __LINK_STATE_PRESENT,
 323        __LINK_STATE_NOCARRIER,
 324        __LINK_STATE_LINKWATCH_PENDING,
 325        __LINK_STATE_DORMANT,
 326};
 327
 328
 329/*
 330 * This structure holds at boot time configured netdevice settings. They
 331 * are then used in the device probing.
 332 */
 333struct netdev_boot_setup {
 334        char name[IFNAMSIZ];
 335        struct ifmap map;
 336};
 337#define NETDEV_BOOT_SETUP_MAX 8
 338
 339extern int __init netdev_boot_setup(char *str);
 340
 341/*
 342 * Structure for NAPI scheduling similar to tasklet but with weighting
 343 */
 344struct napi_struct {
 345        /* The poll_list must only be managed by the entity which
 346         * changes the state of the NAPI_STATE_SCHED bit.  This means
 347         * whoever atomically sets that bit can add this napi_struct
 348         * to the per-cpu poll_list, and whoever clears that bit
 349         * can remove from the list right before clearing the bit.
 350         */
 351        struct list_head        poll_list;
 352
 353        unsigned long           state;
 354        int                     weight;
 355        int                     (*poll)(struct napi_struct *, int);
 356#ifdef CONFIG_NETPOLL
 357        spinlock_t              poll_lock;
 358        int                     poll_owner;
 359#endif
 360
 361        unsigned int            gro_count;
 362
 363        struct net_device       *dev;
 364        struct list_head        dev_list;
 365        struct sk_buff          *gro_list;
 366        struct sk_buff          *skb;
 367};
 368
 369enum {
 370        NAPI_STATE_SCHED,       /* Poll is scheduled */
 371        NAPI_STATE_DISABLE,     /* Disable pending */
 372        NAPI_STATE_NPSVC,       /* Netpoll - don't dequeue from poll_list */
 373};
 374
 375enum gro_result {
 376        GRO_MERGED,
 377        GRO_MERGED_FREE,
 378        GRO_HELD,
 379        GRO_NORMAL,
 380        GRO_DROP,
 381};
 382typedef enum gro_result gro_result_t;
 383
 384extern void __napi_schedule(struct napi_struct *n);
 385
 386static inline int napi_disable_pending(struct napi_struct *n)
 387{
 388        return test_bit(NAPI_STATE_DISABLE, &n->state);
 389}
 390
 391/**
 392 *      napi_schedule_prep - check if napi can be scheduled
 393 *      @n: napi context
 394 *
 395 * Test if NAPI routine is already running, and if not mark
 396 * it as running.  This is used as a condition variable
 397 * insure only one NAPI poll instance runs.  We also make
 398 * sure there is no pending NAPI disable.
 399 */
 400static inline int napi_schedule_prep(struct napi_struct *n)
 401{
 402        return !napi_disable_pending(n) &&
 403                !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
 404}
 405
 406/**
 407 *      napi_schedule - schedule NAPI poll
 408 *      @n: napi context
 409 *
 410 * Schedule NAPI poll routine to be called if it is not already
 411 * running.
 412 */
 413static inline void napi_schedule(struct napi_struct *n)
 414{
 415        if (napi_schedule_prep(n))
 416                __napi_schedule(n);
 417}
 418
 419/* Try to reschedule poll. Called by dev->poll() after napi_complete().  */
 420static inline int napi_reschedule(struct napi_struct *napi)
 421{
 422        if (napi_schedule_prep(napi)) {
 423                __napi_schedule(napi);
 424                return 1;
 425        }
 426        return 0;
 427}
 428
 429/**
 430 *      napi_complete - NAPI processing complete
 431 *      @n: napi context
 432 *
 433 * Mark NAPI processing as complete.
 434 */
 435extern void __napi_complete(struct napi_struct *n);
 436extern void napi_complete(struct napi_struct *n);
 437
 438/**
 439 *      napi_disable - prevent NAPI from scheduling
 440 *      @n: napi context
 441 *
 442 * Stop NAPI from being scheduled on this context.
 443 * Waits till any outstanding processing completes.
 444 */
 445static inline void napi_disable(struct napi_struct *n)
 446{
 447        set_bit(NAPI_STATE_DISABLE, &n->state);
 448        while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
 449                msleep(1);
 450        clear_bit(NAPI_STATE_DISABLE, &n->state);
 451}
 452
 453/**
 454 *      napi_enable - enable NAPI scheduling
 455 *      @n: napi context
 456 *
 457 * Resume NAPI from being scheduled on this context.
 458 * Must be paired with napi_disable.
 459 */
 460static inline void napi_enable(struct napi_struct *n)
 461{
 462        BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
 463        smp_mb__before_clear_bit();
 464        clear_bit(NAPI_STATE_SCHED, &n->state);
 465}
 466
 467#ifdef CONFIG_SMP
 468/**
 469 *      napi_synchronize - wait until NAPI is not running
 470 *      @n: napi context
 471 *
 472 * Wait until NAPI is done being scheduled on this context.
 473 * Waits till any outstanding processing completes but
 474 * does not disable future activations.
 475 */
 476static inline void napi_synchronize(const struct napi_struct *n)
 477{
 478        while (test_bit(NAPI_STATE_SCHED, &n->state))
 479                msleep(1);
 480}
 481#else
 482# define napi_synchronize(n)    barrier()
 483#endif
 484
 485enum netdev_queue_state_t {
 486        __QUEUE_STATE_XOFF,
 487        __QUEUE_STATE_FROZEN,
 488};
 489
 490struct netdev_queue {
 491/*
 492 * read mostly part
 493 */
 494        struct net_device       *dev;
 495        struct Qdisc            *qdisc;
 496        unsigned long           state;
 497        struct Qdisc            *qdisc_sleeping;
 498/*
 499 * write mostly part
 500 */
 501        spinlock_t              _xmit_lock ____cacheline_aligned_in_smp;
 502        int                     xmit_lock_owner;
 503        /*
 504         * please use this field instead of dev->trans_start
 505         */
 506        unsigned long           trans_start;
 507        unsigned long           tx_bytes;
 508        unsigned long           tx_packets;
 509        unsigned long           tx_dropped;
 510} ____cacheline_aligned_in_smp;
 511
 512#ifdef CONFIG_RPS
 513/*
 514 * This structure holds an RPS map which can be of variable length.  The
 515 * map is an array of CPUs.
 516 */
 517struct rps_map {
 518        unsigned int len;
 519        struct rcu_head rcu;
 520        u16 cpus[0];
 521};
 522#define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + (_num * sizeof(u16)))
 523
 524/*
 525 * The rps_dev_flow structure contains the mapping of a flow to a CPU and the
 526 * tail pointer for that CPU's input queue at the time of last enqueue.
 527 */
 528struct rps_dev_flow {
 529        u16 cpu;
 530        u16 fill;
 531        unsigned int last_qtail;
 532};
 533
 534/*
 535 * The rps_dev_flow_table structure contains a table of flow mappings.
 536 */
 537struct rps_dev_flow_table {
 538        unsigned int mask;
 539        struct rcu_head rcu;
 540        struct work_struct free_work;
 541        struct rps_dev_flow flows[0];
 542};
 543#define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
 544    (_num * sizeof(struct rps_dev_flow)))
 545
 546/*
 547 * The rps_sock_flow_table contains mappings of flows to the last CPU
 548 * on which they were processed by the application (set in recvmsg).
 549 */
 550struct rps_sock_flow_table {
 551        unsigned int mask;
 552        u16 ents[0];
 553};
 554#define RPS_SOCK_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_sock_flow_table) + \
 555    (_num * sizeof(u16)))
 556
 557#define RPS_NO_CPU 0xffff
 558
 559static inline void rps_record_sock_flow(struct rps_sock_flow_table *table,
 560                                        u32 hash)
 561{
 562        if (table && hash) {
 563                unsigned int cpu, index = hash & table->mask;
 564
 565                /* We only give a hint, preemption can change cpu under us */
 566                cpu = raw_smp_processor_id();
 567
 568                if (table->ents[index] != cpu)
 569                        table->ents[index] = cpu;
 570        }
 571}
 572
 573static inline void rps_reset_sock_flow(struct rps_sock_flow_table *table,
 574                                       u32 hash)
 575{
 576        if (table && hash)
 577                table->ents[hash & table->mask] = RPS_NO_CPU;
 578}
 579
 580extern struct rps_sock_flow_table *rps_sock_flow_table;
 581
 582/* This structure contains an instance of an RX queue. */
 583struct netdev_rx_queue {
 584        struct rps_map *rps_map;
 585        struct rps_dev_flow_table *rps_flow_table;
 586        struct kobject kobj;
 587        struct netdev_rx_queue *first;
 588        atomic_t count;
 589} ____cacheline_aligned_in_smp;
 590#endif /* CONFIG_RPS */
 591
 592/*
 593 * This structure defines the management hooks for network devices.
 594 * The following hooks can be defined; unless noted otherwise, they are
 595 * optional and can be filled with a null pointer.
 596 *
 597 * int (*ndo_init)(struct net_device *dev);
 598 *     This function is called once when network device is registered.
 599 *     The network device can use this to any late stage initializaton
 600 *     or semantic validattion. It can fail with an error code which will
 601 *     be propogated back to register_netdev
 602 *
 603 * void (*ndo_uninit)(struct net_device *dev);
 604 *     This function is called when device is unregistered or when registration
 605 *     fails. It is not called if init fails.
 606 *
 607 * int (*ndo_open)(struct net_device *dev);
 608 *     This function is called when network device transistions to the up
 609 *     state.
 610 *
 611 * int (*ndo_stop)(struct net_device *dev);
 612 *     This function is called when network device transistions to the down
 613 *     state.
 614 *
 615 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
 616 *                               struct net_device *dev);
 617 *      Called when a packet needs to be transmitted.
 618 *      Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
 619 *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
 620 *      Required can not be NULL.
 621 *
 622 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
 623 *      Called to decide which queue to when device supports multiple
 624 *      transmit queues.
 625 *
 626 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
 627 *      This function is called to allow device receiver to make
 628 *      changes to configuration when multicast or promiscious is enabled.
 629 *
 630 * void (*ndo_set_rx_mode)(struct net_device *dev);
 631 *      This function is called device changes address list filtering.
 632 *
 633 * void (*ndo_set_multicast_list)(struct net_device *dev);
 634 *      This function is called when the multicast address list changes.
 635 *
 636 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
 637 *      This function  is called when the Media Access Control address
 638 *      needs to be changed. If this interface is not defined, the
 639 *      mac address can not be changed.
 640 *
 641 * int (*ndo_validate_addr)(struct net_device *dev);
 642 *      Test if Media Access Control address is valid for the device.
 643 *
 644 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
 645 *      Called when a user request an ioctl which can't be handled by
 646 *      the generic interface code. If not defined ioctl's return
 647 *      not supported error code.
 648 *
 649 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
 650 *      Used to set network devices bus interface parameters. This interface
 651 *      is retained for legacy reason, new devices should use the bus
 652 *      interface (PCI) for low level management.
 653 *
 654 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
 655 *      Called when a user wants to change the Maximum Transfer Unit
 656 *      of a device. If not defined, any request to change MTU will
 657 *      will return an error.
 658 *
 659 * void (*ndo_tx_timeout)(struct net_device *dev);
 660 *      Callback uses when the transmitter has not made any progress
 661 *      for dev->watchdog ticks.
 662 *
 663 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
 664 *      Called when a user wants to get the network device usage
 665 *      statistics. If not defined, the counters in dev->stats will
 666 *      be used.
 667 *
 668 * void (*ndo_vlan_rx_register)(struct net_device *dev, struct vlan_group *grp);
 669 *      If device support VLAN receive accleration
 670 *      (ie. dev->features & NETIF_F_HW_VLAN_RX), then this function is called
 671 *      when vlan groups for the device changes.  Note: grp is NULL
 672 *      if no vlan's groups are being used.
 673 *
 674 * void (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid);
 675 *      If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
 676 *      this function is called when a VLAN id is registered.
 677 *
 678 * void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
 679 *      If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
 680 *      this function is called when a VLAN id is unregistered.
 681 *
 682 * void (*ndo_poll_controller)(struct net_device *dev);
 683 *
 684 *      SR-IOV management functions.
 685 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
 686 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos);
 687 * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate);
 688 * int (*ndo_get_vf_config)(struct net_device *dev,
 689 *                          int vf, struct ifla_vf_info *ivf);
 690 * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
 691 *                        struct nlattr *port[]);
 692 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
 693 */
 694#define HAVE_NET_DEVICE_OPS
 695struct net_device_ops {
 696        int                     (*ndo_init)(struct net_device *dev);
 697        void                    (*ndo_uninit)(struct net_device *dev);
 698        int                     (*ndo_open)(struct net_device *dev);
 699        int                     (*ndo_stop)(struct net_device *dev);
 700        netdev_tx_t             (*ndo_start_xmit) (struct sk_buff *skb,
 701                                                   struct net_device *dev);
 702        u16                     (*ndo_select_queue)(struct net_device *dev,
 703                                                    struct sk_buff *skb);
 704        void                    (*ndo_change_rx_flags)(struct net_device *dev,
 705                                                       int flags);
 706        void                    (*ndo_set_rx_mode)(struct net_device *dev);
 707        void                    (*ndo_set_multicast_list)(struct net_device *dev);
 708        int                     (*ndo_set_mac_address)(struct net_device *dev,
 709                                                       void *addr);
 710        int                     (*ndo_validate_addr)(struct net_device *dev);
 711        int                     (*ndo_do_ioctl)(struct net_device *dev,
 712                                                struct ifreq *ifr, int cmd);
 713        int                     (*ndo_set_config)(struct net_device *dev,
 714                                                  struct ifmap *map);
 715        int                     (*ndo_change_mtu)(struct net_device *dev,
 716                                                  int new_mtu);
 717        int                     (*ndo_neigh_setup)(struct net_device *dev,
 718                                                   struct neigh_parms *);
 719        void                    (*ndo_tx_timeout) (struct net_device *dev);
 720
 721        struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
 722
 723        void                    (*ndo_vlan_rx_register)(struct net_device *dev,
 724                                                        struct vlan_group *grp);
 725        void                    (*ndo_vlan_rx_add_vid)(struct net_device *dev,
 726                                                       unsigned short vid);
 727        void                    (*ndo_vlan_rx_kill_vid)(struct net_device *dev,
 728                                                        unsigned short vid);
 729#ifdef CONFIG_NET_POLL_CONTROLLER
 730        void                    (*ndo_poll_controller)(struct net_device *dev);
 731        void                    (*ndo_netpoll_cleanup)(struct net_device *dev);
 732#endif
 733        int                     (*ndo_set_vf_mac)(struct net_device *dev,
 734                                                  int queue, u8 *mac);
 735        int                     (*ndo_set_vf_vlan)(struct net_device *dev,
 736                                                   int queue, u16 vlan, u8 qos);
 737        int                     (*ndo_set_vf_tx_rate)(struct net_device *dev,
 738                                                      int vf, int rate);
 739        int                     (*ndo_get_vf_config)(struct net_device *dev,
 740                                                     int vf,
 741                                                     struct ifla_vf_info *ivf);
 742        int                     (*ndo_set_vf_port)(struct net_device *dev,
 743                                                   int vf,
 744                                                   struct nlattr *port[]);
 745        int                     (*ndo_get_vf_port)(struct net_device *dev,
 746                                                   int vf, struct sk_buff *skb);
 747#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 748        int                     (*ndo_fcoe_enable)(struct net_device *dev);
 749        int                     (*ndo_fcoe_disable)(struct net_device *dev);
 750        int                     (*ndo_fcoe_ddp_setup)(struct net_device *dev,
 751                                                      u16 xid,
 752                                                      struct scatterlist *sgl,
 753                                                      unsigned int sgc);
 754        int                     (*ndo_fcoe_ddp_done)(struct net_device *dev,
 755                                                     u16 xid);
 756#define NETDEV_FCOE_WWNN 0
 757#define NETDEV_FCOE_WWPN 1
 758        int                     (*ndo_fcoe_get_wwn)(struct net_device *dev,
 759                                                    u64 *wwn, int type);
 760#endif
 761};
 762
 763/*
 764 *      The DEVICE structure.
 765 *      Actually, this whole structure is a big mistake.  It mixes I/O
 766 *      data with strictly "high-level" data, and it has to know about
 767 *      almost every data structure used in the INET module.
 768 *
 769 *      FIXME: cleanup struct net_device such that network protocol info
 770 *      moves out.
 771 */
 772
 773struct net_device {
 774
 775        /*
 776         * This is the first field of the "visible" part of this structure
 777         * (i.e. as seen by users in the "Space.c" file).  It is the name
 778         * the interface.
 779         */
 780        char                    name[IFNAMSIZ];
 781
 782        struct pm_qos_request_list *pm_qos_req;
 783
 784        /* device name hash chain */
 785        struct hlist_node       name_hlist;
 786        /* snmp alias */
 787        char                    *ifalias;
 788
 789        /*
 790         *      I/O specific fields
 791         *      FIXME: Merge these and struct ifmap into one
 792         */
 793        unsigned long           mem_end;        /* shared mem end       */
 794        unsigned long           mem_start;      /* shared mem start     */
 795        unsigned long           base_addr;      /* device I/O address   */
 796        unsigned int            irq;            /* device IRQ number    */
 797
 798        /*
 799         *      Some hardware also needs these fields, but they are not
 800         *      part of the usual set specified in Space.c.
 801         */
 802
 803        unsigned char           if_port;        /* Selectable AUI, TP,..*/
 804        unsigned char           dma;            /* DMA channel          */
 805
 806        unsigned long           state;
 807
 808        struct list_head        dev_list;
 809        struct list_head        napi_list;
 810        struct list_head        unreg_list;
 811
 812        /* Net device features */
 813        unsigned long           features;
 814#define NETIF_F_SG              1       /* Scatter/gather IO. */
 815#define NETIF_F_IP_CSUM         2       /* Can checksum TCP/UDP over IPv4. */
 816#define NETIF_F_NO_CSUM         4       /* Does not require checksum. F.e. loopack. */
 817#define NETIF_F_HW_CSUM         8       /* Can checksum all the packets. */
 818#define NETIF_F_IPV6_CSUM       16      /* Can checksum TCP/UDP over IPV6 */
 819#define NETIF_F_HIGHDMA         32      /* Can DMA to high memory. */
 820#define NETIF_F_FRAGLIST        64      /* Scatter/gather IO. */
 821#define NETIF_F_HW_VLAN_TX      128     /* Transmit VLAN hw acceleration */
 822#define NETIF_F_HW_VLAN_RX      256     /* Receive VLAN hw acceleration */
 823#define NETIF_F_HW_VLAN_FILTER  512     /* Receive filtering on VLAN */
 824#define NETIF_F_VLAN_CHALLENGED 1024    /* Device cannot handle VLAN packets */
 825#define NETIF_F_GSO             2048    /* Enable software GSO. */
 826#define NETIF_F_LLTX            4096    /* LockLess TX - deprecated. Please */
 827                                        /* do not use LLTX in new drivers */
 828#define NETIF_F_NETNS_LOCAL     8192    /* Does not change network namespaces */
 829#define NETIF_F_GRO             16384   /* Generic receive offload */
 830#define NETIF_F_LRO             32768   /* large receive offload */
 831
 832/* the GSO_MASK reserves bits 16 through 23 */
 833#define NETIF_F_FCOE_CRC        (1 << 24) /* FCoE CRC32 */
 834#define NETIF_F_SCTP_CSUM       (1 << 25) /* SCTP checksum offload */
 835#define NETIF_F_FCOE_MTU        (1 << 26) /* Supports max FCoE MTU, 2158 bytes*/
 836#define NETIF_F_NTUPLE          (1 << 27) /* N-tuple filters supported */
 837#define NETIF_F_RXHASH          (1 << 28) /* Receive hashing offload */
 838
 839        /* Segmentation offload features */
 840#define NETIF_F_GSO_SHIFT       16
 841#define NETIF_F_GSO_MASK        0x00ff0000
 842#define NETIF_F_TSO             (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
 843#define NETIF_F_UFO             (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
 844#define NETIF_F_GSO_ROBUST      (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
 845#define NETIF_F_TSO_ECN         (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
 846#define NETIF_F_TSO6            (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
 847#define NETIF_F_FSO             (SKB_GSO_FCOE << NETIF_F_GSO_SHIFT)
 848
 849        /* List of features with software fallbacks. */
 850#define NETIF_F_GSO_SOFTWARE    (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
 851
 852
 853#define NETIF_F_GEN_CSUM        (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
 854#define NETIF_F_V4_CSUM         (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
 855#define NETIF_F_V6_CSUM         (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
 856#define NETIF_F_ALL_CSUM        (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
 857
 858        /*
 859         * If one device supports one of these features, then enable them
 860         * for all in netdev_increment_features.
 861         */
 862#define NETIF_F_ONE_FOR_ALL     (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \
 863                                 NETIF_F_SG | NETIF_F_HIGHDMA |         \
 864                                 NETIF_F_FRAGLIST)
 865
 866        /* Interface index. Unique device identifier    */
 867        int                     ifindex;
 868        int                     iflink;
 869
 870        struct net_device_stats stats;
 871
 872#ifdef CONFIG_WIRELESS_EXT
 873        /* List of functions to handle Wireless Extensions (instead of ioctl).
 874         * See <net/iw_handler.h> for details. Jean II */
 875        const struct iw_handler_def *   wireless_handlers;
 876        /* Instance data managed by the core of Wireless Extensions. */
 877        struct iw_public_data * wireless_data;
 878#endif
 879        /* Management operations */
 880        const struct net_device_ops *netdev_ops;
 881        const struct ethtool_ops *ethtool_ops;
 882
 883        /* Hardware header description */
 884        const struct header_ops *header_ops;
 885
 886        unsigned int            flags;  /* interface flags (a la BSD)   */
 887        unsigned short          gflags;
 888        unsigned short          priv_flags; /* Like 'flags' but invisible to userspace. */
 889        unsigned short          padded; /* How much padding added by alloc_netdev() */
 890
 891        unsigned char           operstate; /* RFC2863 operstate */
 892        unsigned char           link_mode; /* mapping policy to operstate */
 893
 894        unsigned int            mtu;    /* interface MTU value          */
 895        unsigned short          type;   /* interface hardware type      */
 896        unsigned short          hard_header_len;        /* hardware hdr length  */
 897
 898        /* extra head- and tailroom the hardware may need, but not in all cases
 899         * can this be guaranteed, especially tailroom. Some cases also use
 900         * LL_MAX_HEADER instead to allocate the skb.
 901         */
 902        unsigned short          needed_headroom;
 903        unsigned short          needed_tailroom;
 904
 905        struct net_device       *master; /* Pointer to master device of a group,
 906                                          * which this device is member of.
 907                                          */
 908
 909        /* Interface address info. */
 910        unsigned char           perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
 911        unsigned char           addr_len;       /* hardware address length      */
 912        unsigned short          dev_id;         /* for shared network cards */
 913
 914        spinlock_t              addr_list_lock;
 915        struct netdev_hw_addr_list      uc;     /* Unicast mac addresses */
 916        struct netdev_hw_addr_list      mc;     /* Multicast mac addresses */
 917        int                     uc_promisc;
 918        unsigned int            promiscuity;
 919        unsigned int            allmulti;
 920
 921
 922        /* Protocol specific pointers */
 923        
 924#ifdef CONFIG_NET_DSA
 925        void                    *dsa_ptr;       /* dsa specific data */
 926#endif
 927        void                    *atalk_ptr;     /* AppleTalk link       */
 928        void                    *ip_ptr;        /* IPv4 specific data   */
 929        void                    *dn_ptr;        /* DECnet specific data */
 930        void                    *ip6_ptr;       /* IPv6 specific data */
 931        void                    *ec_ptr;        /* Econet specific data */
 932        void                    *ax25_ptr;      /* AX.25 specific data */
 933        struct wireless_dev     *ieee80211_ptr; /* IEEE 802.11 specific data,
 934                                                   assign before registering */
 935
 936/*
 937 * Cache line mostly used on receive path (including eth_type_trans())
 938 */
 939        unsigned long           last_rx;        /* Time of last Rx      */
 940        /* Interface address info used in eth_type_trans() */
 941        unsigned char           *dev_addr;      /* hw address, (before bcast
 942                                                   because most packets are
 943                                                   unicast) */
 944
 945        struct netdev_hw_addr_list      dev_addrs; /* list of device
 946                                                      hw addresses */
 947
 948        unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
 949
 950#ifdef CONFIG_RPS
 951        struct kset             *queues_kset;
 952
 953        struct netdev_rx_queue  *_rx;
 954
 955        /* Number of RX queues allocated at alloc_netdev_mq() time  */
 956        unsigned int            num_rx_queues;
 957#endif
 958
 959        struct netdev_queue     rx_queue;
 960
 961        struct netdev_queue     *_tx ____cacheline_aligned_in_smp;
 962
 963        /* Number of TX queues allocated at alloc_netdev_mq() time  */
 964        unsigned int            num_tx_queues;
 965
 966        /* Number of TX queues currently active in device  */
 967        unsigned int            real_num_tx_queues;
 968
 969        /* root qdisc from userspace point of view */
 970        struct Qdisc            *qdisc;
 971
 972        unsigned long           tx_queue_len;   /* Max frames per queue allowed */
 973        spinlock_t              tx_global_lock;
 974/*
 975 * One part is mostly used on xmit path (device)
 976 */
 977        /* These may be needed for future network-power-down code. */
 978
 979        /*
 980         * trans_start here is expensive for high speed devices on SMP,
 981         * please use netdev_queue->trans_start instead.
 982         */
 983        unsigned long           trans_start;    /* Time (in jiffies) of last Tx */
 984
 985        int                     watchdog_timeo; /* used by dev_watchdog() */
 986        struct timer_list       watchdog_timer;
 987
 988        /* Number of references to this device */
 989        atomic_t                refcnt ____cacheline_aligned_in_smp;
 990
 991        /* delayed register/unregister */
 992        struct list_head        todo_list;
 993        /* device index hash chain */
 994        struct hlist_node       index_hlist;
 995
 996        struct list_head        link_watch_list;
 997
 998        /* register/unregister state machine */
 999        enum { NETREG_UNINITIALIZED=0,
1000               NETREG_REGISTERED,       /* completed register_netdevice */
1001               NETREG_UNREGISTERING,    /* called unregister_netdevice */
1002               NETREG_UNREGISTERED,     /* completed unregister todo */
1003               NETREG_RELEASED,         /* called free_netdev */
1004               NETREG_DUMMY,            /* dummy device for NAPI poll */
1005        } reg_state:16;
1006
1007        enum {
1008                RTNL_LINK_INITIALIZED,
1009                RTNL_LINK_INITIALIZING,
1010        } rtnl_link_state:16;
1011
1012        /* Called from unregister, can be used to call free_netdev */
1013        void (*destructor)(struct net_device *dev);
1014
1015#ifdef CONFIG_NETPOLL
1016        struct netpoll_info     *npinfo;
1017#endif
1018
1019#ifdef CONFIG_NET_NS
1020        /* Network namespace this network device is inside */
1021        struct net              *nd_net;
1022#endif
1023
1024        /* mid-layer private */
1025        void                    *ml_priv;
1026
1027        /* bridge stuff */
1028        struct net_bridge_port  *br_port;
1029        /* macvlan */
1030        struct macvlan_port     *macvlan_port;
1031        /* GARP */
1032        struct garp_port        *garp_port;
1033
1034        /* class/net/name entry */
1035        struct device           dev;
1036        /* space for optional device, statistics, and wireless sysfs groups */
1037        const struct attribute_group *sysfs_groups[4];
1038
1039        /* rtnetlink link ops */
1040        const struct rtnl_link_ops *rtnl_link_ops;
1041
1042        /* VLAN feature mask */
1043        unsigned long vlan_features;
1044
1045        /* for setting kernel sock attribute on TCP connection setup */
1046#define GSO_MAX_SIZE            65536
1047        unsigned int            gso_max_size;
1048
1049#ifdef CONFIG_DCB
1050        /* Data Center Bridging netlink ops */
1051        const struct dcbnl_rtnl_ops *dcbnl_ops;
1052#endif
1053
1054#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
1055        /* max exchange id for FCoE LRO by ddp */
1056        unsigned int            fcoe_ddp_xid;
1057#endif
1058        /* n-tuple filter list attached to this device */
1059        struct ethtool_rx_ntuple_list ethtool_ntuple_list;
1060};
1061#define to_net_dev(d) container_of(d, struct net_device, dev)
1062
1063#define NETDEV_ALIGN            32
1064
1065static inline
1066struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
1067                                         unsigned int index)
1068{
1069        return &dev->_tx[index];
1070}
1071
1072static inline void netdev_for_each_tx_queue(struct net_device *dev,
1073                                            void (*f)(struct net_device *,
1074                                                      struct netdev_queue *,
1075                                                      void *),
1076                                            void *arg)
1077{
1078        unsigned int i;
1079
1080        for (i = 0; i < dev->num_tx_queues; i++)
1081                f(dev, &dev->_tx[i], arg);
1082}
1083
1084/*
1085 * Net namespace inlines
1086 */
1087static inline
1088struct net *dev_net(const struct net_device *dev)
1089{
1090#ifdef CONFIG_NET_NS
1091        return dev->nd_net;
1092#else
1093        return &init_net;
1094#endif
1095}
1096
1097static inline
1098void dev_net_set(struct net_device *dev, struct net *net)
1099{
1100#ifdef CONFIG_NET_NS
1101        release_net(dev->nd_net);
1102        dev->nd_net = hold_net(net);
1103#endif
1104}
1105
1106static inline bool netdev_uses_dsa_tags(struct net_device *dev)
1107{
1108#ifdef CONFIG_NET_DSA_TAG_DSA
1109        if (dev->dsa_ptr != NULL)
1110                return dsa_uses_dsa_tags(dev->dsa_ptr);
1111#endif
1112
1113        return 0;
1114}
1115
1116#ifndef CONFIG_NET_NS
1117static inline void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
1118{
1119        skb->dev = dev;
1120}
1121#else /* CONFIG_NET_NS */
1122void skb_set_dev(struct sk_buff *skb, struct net_device *dev);
1123#endif
1124
1125static inline bool netdev_uses_trailer_tags(struct net_device *dev)
1126{
1127#ifdef CONFIG_NET_DSA_TAG_TRAILER
1128        if (dev->dsa_ptr != NULL)
1129                return dsa_uses_trailer_tags(dev->dsa_ptr);
1130#endif
1131
1132        return 0;
1133}
1134
1135/**
1136 *      netdev_priv - access network device private data
1137 *      @dev: network device
1138 *
1139 * Get network device private data
1140 */
1141static inline void *netdev_priv(const struct net_device *dev)
1142{
1143        return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
1144}
1145
1146/* Set the sysfs physical device reference for the network logical device
1147 * if set prior to registration will cause a symlink during initialization.
1148 */
1149#define SET_NETDEV_DEV(net, pdev)       ((net)->dev.parent = (pdev))
1150
1151/* Set the sysfs device type for the network logical device to allow
1152 * fin grained indentification of different network device types. For
1153 * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
1154 */
1155#define SET_NETDEV_DEVTYPE(net, devtype)        ((net)->dev.type = (devtype))
1156
1157/**
1158 *      netif_napi_add - initialize a napi context
1159 *      @dev:  network device
1160 *      @napi: napi context
1161 *      @poll: polling function
1162 *      @weight: default weight
1163 *
1164 * netif_napi_add() must be used to initialize a napi context prior to calling
1165 * *any* of the other napi related functions.
1166 */
1167void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
1168                    int (*poll)(struct napi_struct *, int), int weight);
1169
1170/**
1171 *  netif_napi_del - remove a napi context
1172 *  @napi: napi context
1173 *
1174 *  netif_napi_del() removes a napi context from the network device napi list
1175 */
1176void netif_napi_del(struct napi_struct *napi);
1177
1178struct napi_gro_cb {
1179        /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
1180        void *frag0;
1181
1182        /* Length of frag0. */
1183        unsigned int frag0_len;
1184
1185        /* This indicates where we are processing relative to skb->data. */
1186        int data_offset;
1187
1188        /* This is non-zero if the packet may be of the same flow. */
1189        int same_flow;
1190
1191        /* This is non-zero if the packet cannot be merged with the new skb. */
1192        int flush;
1193
1194        /* Number of segments aggregated. */
1195        int count;
1196
1197        /* Free the skb? */
1198        int free;
1199};
1200
1201#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1202
1203struct packet_type {
1204        __be16                  type;   /* This is really htons(ether_type). */
1205        struct net_device       *dev;   /* NULL is wildcarded here           */
1206        int                     (*func) (struct sk_buff *,
1207                                         struct net_device *,
1208                                         struct packet_type *,
1209                                         struct net_device *);
1210        struct sk_buff          *(*gso_segment)(struct sk_buff *skb,
1211                                                int features);
1212        int                     (*gso_send_check)(struct sk_buff *skb);
1213        struct sk_buff          **(*gro_receive)(struct sk_buff **head,
1214                                               struct sk_buff *skb);
1215        int                     (*gro_complete)(struct sk_buff *skb);
1216        void                    *af_packet_priv;
1217        struct list_head        list;
1218};
1219
1220#include <linux/interrupt.h>
1221#include <linux/notifier.h>
1222
1223extern rwlock_t                         dev_base_lock;          /* Device list lock */
1224
1225
1226#define for_each_netdev(net, d)         \
1227                list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1228#define for_each_netdev_reverse(net, d) \
1229                list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
1230#define for_each_netdev_rcu(net, d)             \
1231                list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
1232#define for_each_netdev_safe(net, d, n) \
1233                list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
1234#define for_each_netdev_continue(net, d)                \
1235                list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
1236#define for_each_netdev_continue_rcu(net, d)            \
1237        list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
1238#define net_device_entry(lh)    list_entry(lh, struct net_device, dev_list)
1239
1240static inline struct net_device *next_net_device(struct net_device *dev)
1241{
1242        struct list_head *lh;
1243        struct net *net;
1244
1245        net = dev_net(dev);
1246        lh = dev->dev_list.next;
1247        return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1248}
1249
1250static inline struct net_device *next_net_device_rcu(struct net_device *dev)
1251{
1252        struct list_head *lh;
1253        struct net *net;
1254
1255        net = dev_net(dev);
1256        lh = rcu_dereference(dev->dev_list.next);
1257        return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1258}
1259
1260static inline struct net_device *first_net_device(struct net *net)
1261{
1262        return list_empty(&net->dev_base_head) ? NULL :
1263                net_device_entry(net->dev_base_head.next);
1264}
1265
1266extern int                      netdev_boot_setup_check(struct net_device *dev);
1267extern unsigned long            netdev_boot_base(const char *prefix, int unit);
1268extern struct net_device    *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr);
1269extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
1270extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
1271extern void             dev_add_pack(struct packet_type *pt);
1272extern void             dev_remove_pack(struct packet_type *pt);
1273extern void             __dev_remove_pack(struct packet_type *pt);
1274
1275extern struct net_device        *dev_get_by_flags(struct net *net, unsigned short flags,
1276                                                  unsigned short mask);
1277extern struct net_device        *dev_get_by_name(struct net *net, const char *name);
1278extern struct net_device        *dev_get_by_name_rcu(struct net *net, const char *name);
1279extern struct net_device        *__dev_get_by_name(struct net *net, const char *name);
1280extern int              dev_alloc_name(struct net_device *dev, const char *name);
1281extern int              dev_open(struct net_device *dev);
1282extern int              dev_close(struct net_device *dev);
1283extern void             dev_disable_lro(struct net_device *dev);
1284extern int              dev_queue_xmit(struct sk_buff *skb);
1285extern int              register_netdevice(struct net_device *dev);
1286extern void             unregister_netdevice_queue(struct net_device *dev,
1287                                                   struct list_head *head);
1288extern void             unregister_netdevice_many(struct list_head *head);
1289static inline void unregister_netdevice(struct net_device *dev)
1290{
1291        unregister_netdevice_queue(dev, NULL);
1292}
1293
1294extern void             free_netdev(struct net_device *dev);
1295extern void             synchronize_net(void);
1296extern int              register_netdevice_notifier(struct notifier_block *nb);
1297extern int              unregister_netdevice_notifier(struct notifier_block *nb);
1298extern int              init_dummy_netdev(struct net_device *dev);
1299extern void             netdev_resync_ops(struct net_device *dev);
1300
1301extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1302extern struct net_device        *dev_get_by_index(struct net *net, int ifindex);
1303extern struct net_device        *__dev_get_by_index(struct net *net, int ifindex);
1304extern struct net_device        *dev_get_by_index_rcu(struct net *net, int ifindex);
1305extern int              dev_restart(struct net_device *dev);
1306#ifdef CONFIG_NETPOLL_TRAP
1307extern int              netpoll_trap(void);
1308#endif
1309extern int             skb_gro_receive(struct sk_buff **head,
1310                                       struct sk_buff *skb);
1311extern void            skb_gro_reset_offset(struct sk_buff *skb);
1312
1313static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
1314{
1315        return NAPI_GRO_CB(skb)->data_offset;
1316}
1317
1318static inline unsigned int skb_gro_len(const struct sk_buff *skb)
1319{
1320        return skb->len - NAPI_GRO_CB(skb)->data_offset;
1321}
1322
1323static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
1324{
1325        NAPI_GRO_CB(skb)->data_offset += len;
1326}
1327
1328static inline void *skb_gro_header_fast(struct sk_buff *skb,
1329                                        unsigned int offset)
1330{
1331        return NAPI_GRO_CB(skb)->frag0 + offset;
1332}
1333
1334static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
1335{
1336        return NAPI_GRO_CB(skb)->frag0_len < hlen;
1337}
1338
1339static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
1340                                        unsigned int offset)
1341{
1342        NAPI_GRO_CB(skb)->frag0 = NULL;
1343        NAPI_GRO_CB(skb)->frag0_len = 0;
1344        return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL;
1345}
1346
1347static inline void *skb_gro_mac_header(struct sk_buff *skb)
1348{
1349        return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1350}
1351
1352static inline void *skb_gro_network_header(struct sk_buff *skb)
1353{
1354        return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
1355               skb_network_offset(skb);
1356}
1357
1358static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
1359                                  unsigned short type,
1360                                  const void *daddr, const void *saddr,
1361                                  unsigned len)
1362{
1363        if (!dev->header_ops || !dev->header_ops->create)
1364                return 0;
1365
1366        return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1367}
1368
1369static inline int dev_parse_header(const struct sk_buff *skb,
1370                                   unsigned char *haddr)
1371{
1372        const struct net_device *dev = skb->dev;
1373
1374        if (!dev->header_ops || !dev->header_ops->parse)
1375                return 0;
1376        return dev->header_ops->parse(skb, haddr);
1377}
1378
1379typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
1380extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
1381static inline int unregister_gifconf(unsigned int family)
1382{
1383        return register_gifconf(family, NULL);
1384}
1385
1386/*
1387 * Incoming packets are placed on per-cpu queues
1388 */
1389struct softnet_data {
1390        struct Qdisc            *output_queue;
1391        struct Qdisc            **output_queue_tailp;
1392        struct list_head        poll_list;
1393        struct sk_buff          *completion_queue;
1394        struct sk_buff_head     process_queue;
1395
1396        /* stats */
1397        unsigned int            processed;
1398        unsigned int            time_squeeze;
1399        unsigned int            cpu_collision;
1400        unsigned int            received_rps;
1401
1402#ifdef CONFIG_RPS
1403        struct softnet_data     *rps_ipi_list;
1404
1405        /* Elements below can be accessed between CPUs for RPS */
1406        struct call_single_data csd ____cacheline_aligned_in_smp;
1407        struct softnet_data     *rps_ipi_next;
1408        unsigned int            cpu;
1409        unsigned int            input_queue_head;
1410        unsigned int            input_queue_tail;
1411#endif
1412        unsigned                dropped;
1413        struct sk_buff_head     input_pkt_queue;
1414        struct napi_struct      backlog;
1415};
1416
1417static inline void input_queue_head_incr(struct softnet_data *sd)
1418{
1419#ifdef CONFIG_RPS
1420        sd->input_queue_head++;
1421#endif
1422}
1423
1424static inline void input_queue_tail_incr_save(struct softnet_data *sd,
1425                                              unsigned int *qtail)
1426{
1427#ifdef CONFIG_RPS
1428        *qtail = ++sd->input_queue_tail;
1429#endif
1430}
1431
1432DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
1433
1434#define HAVE_NETIF_QUEUE
1435
1436extern void __netif_schedule(struct Qdisc *q);
1437
1438static inline void netif_schedule_queue(struct netdev_queue *txq)
1439{
1440        if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1441                __netif_schedule(txq->qdisc);
1442}
1443
1444static inline void netif_tx_schedule_all(struct net_device *dev)
1445{
1446        unsigned int i;
1447
1448        for (i = 0; i < dev->num_tx_queues; i++)
1449                netif_schedule_queue(netdev_get_tx_queue(dev, i));
1450}
1451
1452static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
1453{
1454        clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1455}
1456
1457/**
1458 *      netif_start_queue - allow transmit
1459 *      @dev: network device
1460 *
1461 *      Allow upper layers to call the device hard_start_xmit routine.
1462 */
1463static inline void netif_start_queue(struct net_device *dev)
1464{
1465        netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
1466}
1467
1468static inline void netif_tx_start_all_queues(struct net_device *dev)
1469{
1470        unsigned int i;
1471
1472        for (i = 0; i < dev->num_tx_queues; i++) {
1473                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1474                netif_tx_start_queue(txq);
1475        }
1476}
1477
1478static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
1479{
1480#ifdef CONFIG_NETPOLL_TRAP
1481        if (netpoll_trap()) {
1482                netif_tx_start_queue(dev_queue);
1483                return;
1484        }
1485#endif
1486        if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
1487                __netif_schedule(dev_queue->qdisc);
1488}
1489
1490/**
1491 *      netif_wake_queue - restart transmit
1492 *      @dev: network device
1493 *
1494 *      Allow upper layers to call the device hard_start_xmit routine.
1495 *      Used for flow control when transmit resources are available.
1496 */
1497static inline void netif_wake_queue(struct net_device *dev)
1498{
1499        netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
1500}
1501
1502static inline void netif_tx_wake_all_queues(struct net_device *dev)
1503{
1504        unsigned int i;
1505
1506        for (i = 0; i < dev->num_tx_queues; i++) {
1507                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1508                netif_tx_wake_queue(txq);
1509        }
1510}
1511
1512static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
1513{
1514        set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1515}
1516
1517/**
1518 *      netif_stop_queue - stop transmitted packets
1519 *      @dev: network device
1520 *
1521 *      Stop upper layers calling the device hard_start_xmit routine.
1522 *      Used for flow control when transmit resources are unavailable.
1523 */
1524static inline void netif_stop_queue(struct net_device *dev)
1525{
1526        netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
1527}
1528
1529static inline void netif_tx_stop_all_queues(struct net_device *dev)
1530{
1531        unsigned int i;
1532
1533        for (i = 0; i < dev->num_tx_queues; i++) {
1534                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1535                netif_tx_stop_queue(txq);
1536        }
1537}
1538
1539static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
1540{
1541        return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1542}
1543
1544/**
1545 *      netif_queue_stopped - test if transmit queue is flowblocked
1546 *      @dev: network device
1547 *
1548 *      Test if transmit queue on device is currently unable to send.
1549 */
1550static inline int netif_queue_stopped(const struct net_device *dev)
1551{
1552        return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
1553}
1554
1555static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue)
1556{
1557        return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state);
1558}
1559
1560/**
1561 *      netif_running - test if up
1562 *      @dev: network device
1563 *
1564 *      Test if the device has been brought up.
1565 */
1566static inline int netif_running(const struct net_device *dev)
1567{
1568        return test_bit(__LINK_STATE_START, &dev->state);
1569}
1570
1571/*
1572 * Routines to manage the subqueues on a device.  We only need start
1573 * stop, and a check if it's stopped.  All other device management is
1574 * done at the overall netdevice level.
1575 * Also test the device if we're multiqueue.
1576 */
1577
1578/**
1579 *      netif_start_subqueue - allow sending packets on subqueue
1580 *      @dev: network device
1581 *      @queue_index: sub queue index
1582 *
1583 * Start individual transmit queue of a device with multiple transmit queues.
1584 */
1585static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
1586{
1587        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1588
1589        netif_tx_start_queue(txq);
1590}
1591
1592/**
1593 *      netif_stop_subqueue - stop sending packets on subqueue
1594 *      @dev: network device
1595 *      @queue_index: sub queue index
1596 *
1597 * Stop individual transmit queue of a device with multiple transmit queues.
1598 */
1599static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
1600{
1601        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1602#ifdef CONFIG_NETPOLL_TRAP
1603        if (netpoll_trap())
1604                return;
1605#endif
1606        netif_tx_stop_queue(txq);
1607}
1608
1609/**
1610 *      netif_subqueue_stopped - test status of subqueue
1611 *      @dev: network device
1612 *      @queue_index: sub queue index
1613 *
1614 * Check individual transmit queue of a device with multiple transmit queues.
1615 */
1616static inline int __netif_subqueue_stopped(const struct net_device *dev,
1617                                         u16 queue_index)
1618{
1619        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1620
1621        return netif_tx_queue_stopped(txq);
1622}
1623
1624static inline int netif_subqueue_stopped(const struct net_device *dev,
1625                                         struct sk_buff *skb)
1626{
1627        return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
1628}
1629
1630/**
1631 *      netif_wake_subqueue - allow sending packets on subqueue
1632 *      @dev: network device
1633 *      @queue_index: sub queue index
1634 *
1635 * Resume individual transmit queue of a device with multiple transmit queues.
1636 */
1637static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
1638{
1639        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1640#ifdef CONFIG_NETPOLL_TRAP
1641        if (netpoll_trap())
1642                return;
1643#endif
1644        if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state))
1645                __netif_schedule(txq->qdisc);
1646}
1647
1648/**
1649 *      netif_is_multiqueue - test if device has multiple transmit queues
1650 *      @dev: network device
1651 *
1652 * Check if device has multiple transmit queues
1653 */
1654static inline int netif_is_multiqueue(const struct net_device *dev)
1655{
1656        return (dev->num_tx_queues > 1);
1657}
1658
1659extern void netif_set_real_num_tx_queues(struct net_device *dev,
1660                                         unsigned int txq);
1661
1662/* Use this variant when it is known for sure that it
1663 * is executing from hardware interrupt context or with hardware interrupts
1664 * disabled.
1665 */
1666extern void dev_kfree_skb_irq(struct sk_buff *skb);
1667
1668/* Use this variant in places where it could be invoked
1669 * from either hardware interrupt or other context, with hardware interrupts
1670 * either disabled or enabled.
1671 */
1672extern void dev_kfree_skb_any(struct sk_buff *skb);
1673
1674#define HAVE_NETIF_RX 1
1675extern int              netif_rx(struct sk_buff *skb);
1676extern int              netif_rx_ni(struct sk_buff *skb);
1677#define HAVE_NETIF_RECEIVE_SKB 1
1678extern int              netif_receive_skb(struct sk_buff *skb);
1679extern gro_result_t     dev_gro_receive(struct napi_struct *napi,
1680                                        struct sk_buff *skb);
1681extern gro_result_t     napi_skb_finish(gro_result_t ret, struct sk_buff *skb);
1682extern gro_result_t     napi_gro_receive(struct napi_struct *napi,
1683                                         struct sk_buff *skb);
1684extern void             napi_reuse_skb(struct napi_struct *napi,
1685                                       struct sk_buff *skb);
1686extern struct sk_buff * napi_get_frags(struct napi_struct *napi);
1687extern gro_result_t     napi_frags_finish(struct napi_struct *napi,
1688                                          struct sk_buff *skb,
1689                                          gro_result_t ret);
1690extern struct sk_buff * napi_frags_skb(struct napi_struct *napi);
1691extern gro_result_t     napi_gro_frags(struct napi_struct *napi);
1692
1693static inline void napi_free_frags(struct napi_struct *napi)
1694{
1695        kfree_skb(napi->skb);
1696        napi->skb = NULL;
1697}
1698
1699extern void             netif_nit_deliver(struct sk_buff *skb);
1700extern int              dev_valid_name(const char *name);
1701extern int              dev_ioctl(struct net *net, unsigned int cmd, void __user *);
1702extern int              dev_ethtool(struct net *net, struct ifreq *);
1703extern unsigned         dev_get_flags(const struct net_device *);
1704extern int              __dev_change_flags(struct net_device *, unsigned int flags);
1705extern int              dev_change_flags(struct net_device *, unsigned);
1706extern void             __dev_notify_flags(struct net_device *, unsigned int old_flags);
1707extern int              dev_change_name(struct net_device *, const char *);
1708extern int              dev_set_alias(struct net_device *, const char *, size_t);
1709extern int              dev_change_net_namespace(struct net_device *,
1710                                                 struct net *, const char *);
1711extern int              dev_set_mtu(struct net_device *, int);
1712extern int              dev_set_mac_address(struct net_device *,
1713                                            struct sockaddr *);
1714extern int              dev_hard_start_xmit(struct sk_buff *skb,
1715                                            struct net_device *dev,
1716                                            struct netdev_queue *txq);
1717extern int              dev_forward_skb(struct net_device *dev,
1718                                        struct sk_buff *skb);
1719
1720extern int              netdev_budget;
1721
1722/* Called by rtnetlink.c:rtnl_unlock() */
1723extern void netdev_run_todo(void);
1724
1725/**
1726 *      dev_put - release reference to device
1727 *      @dev: network device
1728 *
1729 * Release reference to device to allow it to be freed.
1730 */
1731static inline void dev_put(struct net_device *dev)
1732{
1733        atomic_dec(&dev->refcnt);
1734}
1735
1736/**
1737 *      dev_hold - get reference to device
1738 *      @dev: network device
1739 *
1740 * Hold reference to device to keep it from being freed.
1741 */
1742static inline void dev_hold(struct net_device *dev)
1743{
1744        atomic_inc(&dev->refcnt);
1745}
1746
1747/* Carrier loss detection, dial on demand. The functions netif_carrier_on
1748 * and _off may be called from IRQ context, but it is caller
1749 * who is responsible for serialization of these calls.
1750 *
1751 * The name carrier is inappropriate, these functions should really be
1752 * called netif_lowerlayer_*() because they represent the state of any
1753 * kind of lower layer not just hardware media.
1754 */
1755
1756extern void linkwatch_fire_event(struct net_device *dev);
1757extern void linkwatch_forget_dev(struct net_device *dev);
1758
1759/**
1760 *      netif_carrier_ok - test if carrier present
1761 *      @dev: network device
1762 *
1763 * Check if carrier is present on device
1764 */
1765static inline int netif_carrier_ok(const struct net_device *dev)
1766{
1767        return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
1768}
1769
1770extern unsigned long dev_trans_start(struct net_device *dev);
1771
1772extern void __netdev_watchdog_up(struct net_device *dev);
1773
1774extern void netif_carrier_on(struct net_device *dev);
1775
1776extern void netif_carrier_off(struct net_device *dev);
1777
1778extern void netif_notify_peers(struct net_device *dev);
1779
1780/**
1781 *      netif_dormant_on - mark device as dormant.
1782 *      @dev: network device
1783 *
1784 * Mark device as dormant (as per RFC2863).
1785 *
1786 * The dormant state indicates that the relevant interface is not
1787 * actually in a condition to pass packets (i.e., it is not 'up') but is
1788 * in a "pending" state, waiting for some external event.  For "on-
1789 * demand" interfaces, this new state identifies the situation where the
1790 * interface is waiting for events to place it in the up state.
1791 *
1792 */
1793static inline void netif_dormant_on(struct net_device *dev)
1794{
1795        if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
1796                linkwatch_fire_event(dev);
1797}
1798
1799/**
1800 *      netif_dormant_off - set device as not dormant.
1801 *      @dev: network device
1802 *
1803 * Device is not in dormant state.
1804 */
1805static inline void netif_dormant_off(struct net_device *dev)
1806{
1807        if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
1808                linkwatch_fire_event(dev);
1809}
1810
1811/**
1812 *      netif_dormant - test if carrier present
1813 *      @dev: network device
1814 *
1815 * Check if carrier is present on device
1816 */
1817static inline int netif_dormant(const struct net_device *dev)
1818{
1819        return test_bit(__LINK_STATE_DORMANT, &dev->state);
1820}
1821
1822
1823/**
1824 *      netif_oper_up - test if device is operational
1825 *      @dev: network device
1826 *
1827 * Check if carrier is operational
1828 */
1829static inline int netif_oper_up(const struct net_device *dev)
1830{
1831        return (dev->operstate == IF_OPER_UP ||
1832                dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
1833}
1834
1835/**
1836 *      netif_device_present - is device available or removed
1837 *      @dev: network device
1838 *
1839 * Check if device has not been removed from system.
1840 */
1841static inline int netif_device_present(struct net_device *dev)
1842{
1843        return test_bit(__LINK_STATE_PRESENT, &dev->state);
1844}
1845
1846extern void netif_device_detach(struct net_device *dev);
1847
1848extern void netif_device_attach(struct net_device *dev);
1849
1850/*
1851 * Network interface message level settings
1852 */
1853#define HAVE_NETIF_MSG 1
1854
1855enum {
1856        NETIF_MSG_DRV           = 0x0001,
1857        NETIF_MSG_PROBE         = 0x0002,
1858        NETIF_MSG_LINK          = 0x0004,
1859        NETIF_MSG_TIMER         = 0x0008,
1860        NETIF_MSG_IFDOWN        = 0x0010,
1861        NETIF_MSG_IFUP          = 0x0020,
1862        NETIF_MSG_RX_ERR        = 0x0040,
1863        NETIF_MSG_TX_ERR        = 0x0080,
1864        NETIF_MSG_TX_QUEUED     = 0x0100,
1865        NETIF_MSG_INTR          = 0x0200,
1866        NETIF_MSG_TX_DONE       = 0x0400,
1867        NETIF_MSG_RX_STATUS     = 0x0800,
1868        NETIF_MSG_PKTDATA       = 0x1000,
1869        NETIF_MSG_HW            = 0x2000,
1870        NETIF_MSG_WOL           = 0x4000,
1871};
1872
1873#define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
1874#define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
1875#define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
1876#define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
1877#define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
1878#define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
1879#define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
1880#define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
1881#define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
1882#define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
1883#define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
1884#define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
1885#define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
1886#define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
1887#define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
1888
1889static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
1890{
1891        /* use default */
1892        if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
1893                return default_msg_enable_bits;
1894        if (debug_value == 0)   /* no output */
1895                return 0;
1896        /* set low N bits */
1897        return (1 << debug_value) - 1;
1898}
1899
1900static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
1901{
1902        spin_lock(&txq->_xmit_lock);
1903        txq->xmit_lock_owner = cpu;
1904}
1905
1906static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
1907{
1908        spin_lock_bh(&txq->_xmit_lock);
1909        txq->xmit_lock_owner = smp_processor_id();
1910}
1911
1912static inline int __netif_tx_trylock(struct netdev_queue *txq)
1913{
1914        int ok = spin_trylock(&txq->_xmit_lock);
1915        if (likely(ok))
1916                txq->xmit_lock_owner = smp_processor_id();
1917        return ok;
1918}
1919
1920static inline void __netif_tx_unlock(struct netdev_queue *txq)
1921{
1922        txq->xmit_lock_owner = -1;
1923        spin_unlock(&txq->_xmit_lock);
1924}
1925
1926static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
1927{
1928        txq->xmit_lock_owner = -1;
1929        spin_unlock_bh(&txq->_xmit_lock);
1930}
1931
1932static inline void txq_trans_update(struct netdev_queue *txq)
1933{
1934        if (txq->xmit_lock_owner != -1)
1935                txq->trans_start = jiffies;
1936}
1937
1938/**
1939 *      netif_tx_lock - grab network device transmit lock
1940 *      @dev: network device
1941 *
1942 * Get network device transmit lock
1943 */
1944static inline void netif_tx_lock(struct net_device *dev)
1945{
1946        unsigned int i;
1947        int cpu;
1948
1949        spin_lock(&dev->tx_global_lock);
1950        cpu = smp_processor_id();
1951        for (i = 0; i < dev->num_tx_queues; i++) {
1952                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1953
1954                /* We are the only thread of execution doing a
1955                 * freeze, but we have to grab the _xmit_lock in
1956                 * order to synchronize with threads which are in
1957                 * the ->hard_start_xmit() handler and already
1958                 * checked the frozen bit.
1959                 */
1960                __netif_tx_lock(txq, cpu);
1961                set_bit(__QUEUE_STATE_FROZEN, &txq->state);
1962                __netif_tx_unlock(txq);
1963        }
1964}
1965
1966static inline void netif_tx_lock_bh(struct net_device *dev)
1967{
1968        local_bh_disable();
1969        netif_tx_lock(dev);
1970}
1971
1972static inline void netif_tx_unlock(struct net_device *dev)
1973{
1974        unsigned int i;
1975
1976        for (i = 0; i < dev->num_tx_queues; i++) {
1977                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1978
1979                /* No need to grab the _xmit_lock here.  If the
1980                 * queue is not stopped for another reason, we
1981                 * force a schedule.
1982                 */
1983                clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
1984                netif_schedule_queue(txq);
1985        }
1986        spin_unlock(&dev->tx_global_lock);
1987}
1988
1989static inline void netif_tx_unlock_bh(struct net_device *dev)
1990{
1991        netif_tx_unlock(dev);
1992        local_bh_enable();
1993}
1994
1995#define HARD_TX_LOCK(dev, txq, cpu) {                   \
1996        if ((dev->features & NETIF_F_LLTX) == 0) {      \
1997                __netif_tx_lock(txq, cpu);              \
1998        }                                               \
1999}
2000
2001#define HARD_TX_UNLOCK(dev, txq) {                      \
2002        if ((dev->features & NETIF_F_LLTX) == 0) {      \
2003                __netif_tx_unlock(txq);                 \
2004        }                                               \
2005}
2006
2007static inline void netif_tx_disable(struct net_device *dev)
2008{
2009        unsigned int i;
2010        int cpu;
2011
2012        local_bh_disable();
2013        cpu = smp_processor_id();
2014        for (i = 0; i < dev->num_tx_queues; i++) {
2015                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2016
2017                __netif_tx_lock(txq, cpu);
2018                netif_tx_stop_queue(txq);
2019                __netif_tx_unlock(txq);
2020        }
2021        local_bh_enable();
2022}
2023
2024static inline void netif_addr_lock(struct net_device *dev)
2025{
2026        spin_lock(&dev->addr_list_lock);
2027}
2028
2029static inline void netif_addr_lock_bh(struct net_device *dev)
2030{
2031        spin_lock_bh(&dev->addr_list_lock);
2032}
2033
2034static inline void netif_addr_unlock(struct net_device *dev)
2035{
2036        spin_unlock(&dev->addr_list_lock);
2037}
2038
2039static inline void netif_addr_unlock_bh(struct net_device *dev)
2040{
2041        spin_unlock_bh(&dev->addr_list_lock);
2042}
2043
2044/*
2045 * dev_addrs walker. Should be used only for read access. Call with
2046 * rcu_read_lock held.
2047 */
2048#define for_each_dev_addr(dev, ha) \
2049                list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
2050
2051/* These functions live elsewhere (drivers/net/net_init.c, but related) */
2052
2053extern void             ether_setup(struct net_device *dev);
2054
2055/* Support for loadable net-drivers */
2056extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
2057                                       void (*setup)(struct net_device *),
2058                                       unsigned int queue_count);
2059#define alloc_netdev(sizeof_priv, name, setup) \
2060        alloc_netdev_mq(sizeof_priv, name, setup, 1)
2061extern int              register_netdev(struct net_device *dev);
2062extern void             unregister_netdev(struct net_device *dev);
2063
2064/* General hardware address lists handling functions */
2065extern int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
2066                                  struct netdev_hw_addr_list *from_list,
2067                                  int addr_len, unsigned char addr_type);
2068extern void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
2069                                   struct netdev_hw_addr_list *from_list,
2070                                   int addr_len, unsigned char addr_type);
2071extern int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
2072                          struct netdev_hw_addr_list *from_list,
2073                          int addr_len);
2074extern void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
2075                             struct netdev_hw_addr_list *from_list,
2076                             int addr_len);
2077extern void __hw_addr_flush(struct netdev_hw_addr_list *list);
2078extern void __hw_addr_init(struct netdev_hw_addr_list *list);
2079
2080/* Functions used for device addresses handling */
2081extern int dev_addr_add(struct net_device *dev, unsigned char *addr,
2082                        unsigned char addr_type);
2083extern int dev_addr_del(struct net_device *dev, unsigned char *addr,
2084                        unsigned char addr_type);
2085extern int dev_addr_add_multiple(struct net_device *to_dev,
2086                                 struct net_device *from_dev,
2087                                 unsigned char addr_type);
2088extern int dev_addr_del_multiple(struct net_device *to_dev,
2089                                 struct net_device *from_dev,
2090                                 unsigned char addr_type);
2091extern void dev_addr_flush(struct net_device *dev);
2092extern int dev_addr_init(struct net_device *dev);
2093
2094/* Functions used for unicast addresses handling */
2095extern int dev_uc_add(struct net_device *dev, unsigned char *addr);
2096extern int dev_uc_del(struct net_device *dev, unsigned char *addr);
2097extern int dev_uc_sync(struct net_device *to, struct net_device *from);
2098extern void dev_uc_unsync(struct net_device *to, struct net_device *from);
2099extern void dev_uc_flush(struct net_device *dev);
2100extern void dev_uc_init(struct net_device *dev);
2101
2102/* Functions used for multicast addresses handling */
2103extern int dev_mc_add(struct net_device *dev, unsigned char *addr);
2104extern int dev_mc_add_global(struct net_device *dev, unsigned char *addr);
2105extern int dev_mc_del(struct net_device *dev, unsigned char *addr);
2106extern int dev_mc_del_global(struct net_device *dev, unsigned char *addr);
2107extern int dev_mc_sync(struct net_device *to, struct net_device *from);
2108extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
2109extern void dev_mc_flush(struct net_device *dev);
2110extern void dev_mc_init(struct net_device *dev);
2111
2112/* Functions used for secondary unicast and multicast support */
2113extern void             dev_set_rx_mode(struct net_device *dev);
2114extern void             __dev_set_rx_mode(struct net_device *dev);
2115extern int              dev_set_promiscuity(struct net_device *dev, int inc);
2116extern int              dev_set_allmulti(struct net_device *dev, int inc);
2117extern void             netdev_state_change(struct net_device *dev);
2118extern int              netdev_bonding_change(struct net_device *dev,
2119                                              unsigned long event);
2120extern void             netdev_features_change(struct net_device *dev);
2121/* Load a device via the kmod */
2122extern void             dev_load(struct net *net, const char *name);
2123extern void             dev_mcast_init(void);
2124extern const struct net_device_stats *dev_get_stats(struct net_device *dev);
2125extern void             dev_txq_stats_fold(const struct net_device *dev, struct net_device_stats *stats);
2126
2127extern int              netdev_max_backlog;
2128extern int              netdev_tstamp_prequeue;
2129extern int              weight_p;
2130extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
2131extern int skb_checksum_help(struct sk_buff *skb);
2132extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
2133#ifdef CONFIG_BUG
2134extern void netdev_rx_csum_fault(struct net_device *dev);
2135#else
2136static inline void netdev_rx_csum_fault(struct net_device *dev)
2137{
2138}
2139#endif
2140/* rx skb timestamps */
2141extern void             net_enable_timestamp(void);
2142extern void             net_disable_timestamp(void);
2143
2144#ifdef CONFIG_PROC_FS
2145extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
2146extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
2147extern void dev_seq_stop(struct seq_file *seq, void *v);
2148#endif
2149
2150extern int netdev_class_create_file(struct class_attribute *class_attr);
2151extern void netdev_class_remove_file(struct class_attribute *class_attr);
2152
2153extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len);
2154
2155extern void linkwatch_run_queue(void);
2156
2157unsigned long netdev_increment_features(unsigned long all, unsigned long one,
2158                                        unsigned long mask);
2159unsigned long netdev_fix_features(unsigned long features, const char *name);
2160
2161void netif_stacked_transfer_operstate(const struct net_device *rootdev,
2162                                        struct net_device *dev);
2163
2164static inline int net_gso_ok(int features, int gso_type)
2165{
2166        int feature = gso_type << NETIF_F_GSO_SHIFT;
2167        return (features & feature) == feature;
2168}
2169
2170static inline int skb_gso_ok(struct sk_buff *skb, int features)
2171{
2172        return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
2173               (!skb_has_frags(skb) || (features & NETIF_F_FRAGLIST));
2174}
2175
2176static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
2177{
2178        return skb_is_gso(skb) &&
2179               (!skb_gso_ok(skb, dev->features) ||
2180                unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
2181}
2182
2183static inline void netif_set_gso_max_size(struct net_device *dev,
2184                                          unsigned int size)
2185{
2186        dev->gso_max_size = size;
2187}
2188
2189extern int __skb_bond_should_drop(struct sk_buff *skb,
2190                                  struct net_device *master);
2191
2192static inline int skb_bond_should_drop(struct sk_buff *skb,
2193                                       struct net_device *master)
2194{
2195        if (master)
2196                return __skb_bond_should_drop(skb, master);
2197        return 0;
2198}
2199
2200extern struct pernet_operations __net_initdata loopback_net_ops;
2201
2202static inline int dev_ethtool_get_settings(struct net_device *dev,
2203                                           struct ethtool_cmd *cmd)
2204{
2205        if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings)
2206                return -EOPNOTSUPP;
2207        return dev->ethtool_ops->get_settings(dev, cmd);
2208}
2209
2210static inline u32 dev_ethtool_get_rx_csum(struct net_device *dev)
2211{
2212        if (!dev->ethtool_ops || !dev->ethtool_ops->get_rx_csum)
2213                return 0;
2214        return dev->ethtool_ops->get_rx_csum(dev);
2215}
2216
2217static inline u32 dev_ethtool_get_flags(struct net_device *dev)
2218{
2219        if (!dev->ethtool_ops || !dev->ethtool_ops->get_flags)
2220                return 0;
2221        return dev->ethtool_ops->get_flags(dev);
2222}
2223
2224/* Logging, debugging and troubleshooting/diagnostic helpers. */
2225
2226/* netdev_printk helpers, similar to dev_printk */
2227
2228static inline const char *netdev_name(const struct net_device *dev)
2229{
2230        if (dev->reg_state != NETREG_REGISTERED)
2231                return "(unregistered net_device)";
2232        return dev->name;
2233}
2234
2235#define netdev_printk(level, netdev, format, args...)           \
2236        dev_printk(level, (netdev)->dev.parent,                 \
2237                   "%s: " format,                               \
2238                   netdev_name(netdev), ##args)
2239
2240#define netdev_emerg(dev, format, args...)                      \
2241        netdev_printk(KERN_EMERG, dev, format, ##args)
2242#define netdev_alert(dev, format, args...)                      \
2243        netdev_printk(KERN_ALERT, dev, format, ##args)
2244#define netdev_crit(dev, format, args...)                       \
2245        netdev_printk(KERN_CRIT, dev, format, ##args)
2246#define netdev_err(dev, format, args...)                        \
2247        netdev_printk(KERN_ERR, dev, format, ##args)
2248#define netdev_warn(dev, format, args...)                       \
2249        netdev_printk(KERN_WARNING, dev, format, ##args)
2250#define netdev_notice(dev, format, args...)                     \
2251        netdev_printk(KERN_NOTICE, dev, format, ##args)
2252#define netdev_info(dev, format, args...)                       \
2253        netdev_printk(KERN_INFO, dev, format, ##args)
2254
2255#if defined(DEBUG)
2256#define netdev_dbg(__dev, format, args...)                      \
2257        netdev_printk(KERN_DEBUG, __dev, format, ##args)
2258#elif defined(CONFIG_DYNAMIC_DEBUG)
2259#define netdev_dbg(__dev, format, args...)                      \
2260do {                                                            \
2261        dynamic_dev_dbg((__dev)->dev.parent, "%s: " format,     \
2262                        netdev_name(__dev), ##args);            \
2263} while (0)
2264#else
2265#define netdev_dbg(__dev, format, args...)                      \
2266({                                                              \
2267        if (0)                                                  \
2268                netdev_printk(KERN_DEBUG, __dev, format, ##args); \
2269        0;                                                      \
2270})
2271#endif
2272
2273#if defined(VERBOSE_DEBUG)
2274#define netdev_vdbg     netdev_dbg
2275#else
2276
2277#define netdev_vdbg(dev, format, args...)                       \
2278({                                                              \
2279        if (0)                                                  \
2280                netdev_printk(KERN_DEBUG, dev, format, ##args); \
2281        0;                                                      \
2282})
2283#endif
2284
2285/*
2286 * netdev_WARN() acts like dev_printk(), but with the key difference
2287 * of using a WARN/WARN_ON to get the message out, including the
2288 * file/line information and a backtrace.
2289 */
2290#define netdev_WARN(dev, format, args...)                       \
2291        WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args);
2292
2293/* netif printk helpers, similar to netdev_printk */
2294
2295#define netif_printk(priv, type, level, dev, fmt, args...)      \
2296do {                                                            \
2297        if (netif_msg_##type(priv))                             \
2298                netdev_printk(level, (dev), fmt, ##args);       \
2299} while (0)
2300
2301#define netif_emerg(priv, type, dev, fmt, args...)              \
2302        netif_printk(priv, type, KERN_EMERG, dev, fmt, ##args)
2303#define netif_alert(priv, type, dev, fmt, args...)              \
2304        netif_printk(priv, type, KERN_ALERT, dev, fmt, ##args)
2305#define netif_crit(priv, type, dev, fmt, args...)               \
2306        netif_printk(priv, type, KERN_CRIT, dev, fmt, ##args)
2307#define netif_err(priv, type, dev, fmt, args...)                \
2308        netif_printk(priv, type, KERN_ERR, dev, fmt, ##args)
2309#define netif_warn(priv, type, dev, fmt, args...)               \
2310        netif_printk(priv, type, KERN_WARNING, dev, fmt, ##args)
2311#define netif_notice(priv, type, dev, fmt, args...)             \
2312        netif_printk(priv, type, KERN_NOTICE, dev, fmt, ##args)
2313#define netif_info(priv, type, dev, fmt, args...)               \
2314        netif_printk(priv, type, KERN_INFO, (dev), fmt, ##args)
2315
2316#if defined(DEBUG)
2317#define netif_dbg(priv, type, dev, format, args...)             \
2318        netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
2319#elif defined(CONFIG_DYNAMIC_DEBUG)
2320#define netif_dbg(priv, type, netdev, format, args...)          \
2321do {                                                            \
2322        if (netif_msg_##type(priv))                             \
2323                dynamic_dev_dbg((netdev)->dev.parent,           \
2324                                "%s: " format,                  \
2325                                netdev_name(netdev), ##args);   \
2326} while (0)
2327#else
2328#define netif_dbg(priv, type, dev, format, args...)                     \
2329({                                                                      \
2330        if (0)                                                          \
2331                netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2332        0;                                                              \
2333})
2334#endif
2335
2336#if defined(VERBOSE_DEBUG)
2337#define netif_vdbg      netif_dbg
2338#else
2339#define netif_vdbg(priv, type, dev, format, args...)            \
2340({                                                              \
2341        if (0)                                                  \
2342                netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2343        0;                                                      \
2344})
2345#endif
2346
2347#endif /* __KERNEL__ */
2348
2349#endif  /* _LINUX_NETDEVICE_H */
2350
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