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/pm_qos.h>
  29#include <linux/timer.h>
  30#include <linux/bug.h>
  31#include <linux/delay.h>
  32#include <linux/atomic.h>
  33#include <asm/cache.h>
  34#include <asm/byteorder.h>
  35
  36#include <linux/percpu.h>
  37#include <linux/rculist.h>
  38#include <linux/dmaengine.h>
  39#include <linux/workqueue.h>
  40#include <linux/dynamic_queue_limits.h>
  41
  42#include <linux/ethtool.h>
  43#include <net/net_namespace.h>
  44#include <net/dsa.h>
  45#ifdef CONFIG_DCB
  46#include <net/dcbnl.h>
  47#endif
  48#include <net/netprio_cgroup.h>
  49
  50#include <linux/netdev_features.h>
  51#include <linux/neighbour.h>
  52#include <uapi/linux/netdevice.h>
  53
  54struct netpoll_info;
  55struct device;
  56struct phy_device;
  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
  63extern void netdev_set_default_ethtool_ops(struct net_device *dev,
  64                                           const struct ethtool_ops *ops);
  65
  66/* hardware address assignment types */
  67#define NET_ADDR_PERM           0       /* address is permanent (default) */
  68#define NET_ADDR_RANDOM         1       /* address is generated randomly */
  69#define NET_ADDR_STOLEN         2       /* address is stolen from other device */
  70
  71/* Backlog congestion levels */
  72#define NET_RX_SUCCESS          0       /* keep 'em coming, baby */
  73#define NET_RX_DROP             1       /* packet dropped */
  74
  75/*
  76 * Transmit return codes: transmit return codes originate from three different
  77 * namespaces:
  78 *
  79 * - qdisc return codes
  80 * - driver transmit return codes
  81 * - errno values
  82 *
  83 * Drivers are allowed to return any one of those in their hard_start_xmit()
  84 * function. Real network devices commonly used with qdiscs should only return
  85 * the driver transmit return codes though - when qdiscs are used, the actual
  86 * transmission happens asynchronously, so the value is not propagated to
  87 * higher layers. Virtual network devices transmit synchronously, in this case
  88 * the driver transmit return codes are consumed by dev_queue_xmit(), all
  89 * others are propagated to higher layers.
  90 */
  91
  92/* qdisc ->enqueue() return codes. */
  93#define NET_XMIT_SUCCESS        0x00
  94#define NET_XMIT_DROP           0x01    /* skb dropped                  */
  95#define NET_XMIT_CN             0x02    /* congestion notification      */
  96#define NET_XMIT_POLICED        0x03    /* skb is shot by police        */
  97#define NET_XMIT_MASK           0x0f    /* qdisc flags in net/sch_generic.h */
  98
  99/* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
 100 * indicates that the device will soon be dropping packets, or already drops
 101 * some packets of the same priority; prompting us to send less aggressively. */
 102#define net_xmit_eval(e)        ((e) == NET_XMIT_CN ? 0 : (e))
 103#define net_xmit_errno(e)       ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
 104
 105/* Driver transmit return codes */
 106#define NETDEV_TX_MASK          0xf0
 107
 108enum netdev_tx {
 109        __NETDEV_TX_MIN  = INT_MIN,     /* make sure enum is signed */
 110        NETDEV_TX_OK     = 0x00,        /* driver took care of packet */
 111        NETDEV_TX_BUSY   = 0x10,        /* driver tx path was busy*/
 112        NETDEV_TX_LOCKED = 0x20,        /* driver tx lock was already taken */
 113};
 114typedef enum netdev_tx netdev_tx_t;
 115
 116/*
 117 * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant;
 118 * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed.
 119 */
 120static inline bool dev_xmit_complete(int rc)
 121{
 122        /*
 123         * Positive cases with an skb consumed by a driver:
 124         * - successful transmission (rc == NETDEV_TX_OK)
 125         * - error while transmitting (rc < 0)
 126         * - error while queueing to a different device (rc & NET_XMIT_MASK)
 127         */
 128        if (likely(rc < NET_XMIT_MASK))
 129                return true;
 130
 131        return false;
 132}
 133
 134/*
 135 *      Compute the worst case header length according to the protocols
 136 *      used.
 137 */
 138
 139#if defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
 140# if defined(CONFIG_MAC80211_MESH)
 141#  define LL_MAX_HEADER 128
 142# else
 143#  define LL_MAX_HEADER 96
 144# endif
 145#elif IS_ENABLED(CONFIG_TR)
 146# define LL_MAX_HEADER 48
 147#else
 148# define LL_MAX_HEADER 32
 149#endif
 150
 151#if !IS_ENABLED(CONFIG_NET_IPIP) && !IS_ENABLED(CONFIG_NET_IPGRE) && \
 152    !IS_ENABLED(CONFIG_IPV6_SIT) && !IS_ENABLED(CONFIG_IPV6_TUNNEL)
 153#define MAX_HEADER LL_MAX_HEADER
 154#else
 155#define MAX_HEADER (LL_MAX_HEADER + 48)
 156#endif
 157
 158/*
 159 *      Old network device statistics. Fields are native words
 160 *      (unsigned long) so they can be read and written atomically.
 161 */
 162
 163struct net_device_stats {
 164        unsigned long   rx_packets;
 165        unsigned long   tx_packets;
 166        unsigned long   rx_bytes;
 167        unsigned long   tx_bytes;
 168        unsigned long   rx_errors;
 169        unsigned long   tx_errors;
 170        unsigned long   rx_dropped;
 171        unsigned long   tx_dropped;
 172        unsigned long   multicast;
 173        unsigned long   collisions;
 174        unsigned long   rx_length_errors;
 175        unsigned long   rx_over_errors;
 176        unsigned long   rx_crc_errors;
 177        unsigned long   rx_frame_errors;
 178        unsigned long   rx_fifo_errors;
 179        unsigned long   rx_missed_errors;
 180        unsigned long   tx_aborted_errors;
 181        unsigned long   tx_carrier_errors;
 182        unsigned long   tx_fifo_errors;
 183        unsigned long   tx_heartbeat_errors;
 184        unsigned long   tx_window_errors;
 185        unsigned long   rx_compressed;
 186        unsigned long   tx_compressed;
 187};
 188
 189
 190#include <linux/cache.h>
 191#include <linux/skbuff.h>
 192
 193#ifdef CONFIG_RPS
 194#include <linux/static_key.h>
 195extern struct static_key rps_needed;
 196#endif
 197
 198struct neighbour;
 199struct neigh_parms;
 200struct sk_buff;
 201
 202struct netdev_hw_addr {
 203        struct list_head        list;
 204        unsigned char           addr[MAX_ADDR_LEN];
 205        unsigned char           type;
 206#define NETDEV_HW_ADDR_T_LAN            1
 207#define NETDEV_HW_ADDR_T_SAN            2
 208#define NETDEV_HW_ADDR_T_SLAVE          3
 209#define NETDEV_HW_ADDR_T_UNICAST        4
 210#define NETDEV_HW_ADDR_T_MULTICAST      5
 211        bool                    synced;
 212        bool                    global_use;
 213        int                     refcount;
 214        struct rcu_head         rcu_head;
 215};
 216
 217struct netdev_hw_addr_list {
 218        struct list_head        list;
 219        int                     count;
 220};
 221
 222#define netdev_hw_addr_list_count(l) ((l)->count)
 223#define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0)
 224#define netdev_hw_addr_list_for_each(ha, l) \
 225        list_for_each_entry(ha, &(l)->list, list)
 226
 227#define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc)
 228#define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc)
 229#define netdev_for_each_uc_addr(ha, dev) \
 230        netdev_hw_addr_list_for_each(ha, &(dev)->uc)
 231
 232#define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc)
 233#define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc)
 234#define netdev_for_each_mc_addr(ha, dev) \
 235        netdev_hw_addr_list_for_each(ha, &(dev)->mc)
 236
 237struct hh_cache {
 238        u16             hh_len;
 239        u16             __pad;
 240        seqlock_t       hh_lock;
 241
 242        /* cached hardware header; allow for machine alignment needs.        */
 243#define HH_DATA_MOD     16
 244#define HH_DATA_OFF(__len) \
 245        (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
 246#define HH_DATA_ALIGN(__len) \
 247        (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
 248        unsigned long   hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
 249};
 250
 251/* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
 252 * Alternative is:
 253 *   dev->hard_header_len ? (dev->hard_header_len +
 254 *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
 255 *
 256 * We could use other alignment values, but we must maintain the
 257 * relationship HH alignment <= LL alignment.
 258 */
 259#define LL_RESERVED_SPACE(dev) \
 260        ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 261#define LL_RESERVED_SPACE_EXTRA(dev,extra) \
 262        ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 263
 264struct header_ops {
 265        int     (*create) (struct sk_buff *skb, struct net_device *dev,
 266                           unsigned short type, const void *daddr,
 267                           const void *saddr, unsigned int len);
 268        int     (*parse)(const struct sk_buff *skb, unsigned char *haddr);
 269        int     (*rebuild)(struct sk_buff *skb);
 270        int     (*cache)(const struct neighbour *neigh, struct hh_cache *hh, __be16 type);
 271        void    (*cache_update)(struct hh_cache *hh,
 272                                const struct net_device *dev,
 273                                const unsigned char *haddr);
 274};
 275
 276/* These flag bits are private to the generic network queueing
 277 * layer, they may not be explicitly referenced by any other
 278 * code.
 279 */
 280
 281enum netdev_state_t {
 282        __LINK_STATE_START,
 283        __LINK_STATE_PRESENT,
 284        __LINK_STATE_NOCARRIER,
 285        __LINK_STATE_LINKWATCH_PENDING,
 286        __LINK_STATE_DORMANT,
 287};
 288
 289
 290/*
 291 * This structure holds at boot time configured netdevice settings. They
 292 * are then used in the device probing.
 293 */
 294struct netdev_boot_setup {
 295        char name[IFNAMSIZ];
 296        struct ifmap map;
 297};
 298#define NETDEV_BOOT_SETUP_MAX 8
 299
 300extern int __init netdev_boot_setup(char *str);
 301
 302/*
 303 * Structure for NAPI scheduling similar to tasklet but with weighting
 304 */
 305struct napi_struct {
 306        /* The poll_list must only be managed by the entity which
 307         * changes the state of the NAPI_STATE_SCHED bit.  This means
 308         * whoever atomically sets that bit can add this napi_struct
 309         * to the per-cpu poll_list, and whoever clears that bit
 310         * can remove from the list right before clearing the bit.
 311         */
 312        struct list_head        poll_list;
 313
 314        unsigned long           state;
 315        int                     weight;
 316        unsigned int            gro_count;
 317        int                     (*poll)(struct napi_struct *, int);
 318#ifdef CONFIG_NETPOLL
 319        spinlock_t              poll_lock;
 320        int                     poll_owner;
 321#endif
 322        struct net_device       *dev;
 323        struct sk_buff          *gro_list;
 324        struct sk_buff          *skb;
 325        struct list_head        dev_list;
 326};
 327
 328enum {
 329        NAPI_STATE_SCHED,       /* Poll is scheduled */
 330        NAPI_STATE_DISABLE,     /* Disable pending */
 331        NAPI_STATE_NPSVC,       /* Netpoll - don't dequeue from poll_list */
 332};
 333
 334enum gro_result {
 335        GRO_MERGED,
 336        GRO_MERGED_FREE,
 337        GRO_HELD,
 338        GRO_NORMAL,
 339        GRO_DROP,
 340};
 341typedef enum gro_result gro_result_t;
 342
 343/*
 344 * enum rx_handler_result - Possible return values for rx_handlers.
 345 * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it
 346 * further.
 347 * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in
 348 * case skb->dev was changed by rx_handler.
 349 * @RX_HANDLER_EXACT: Force exact delivery, no wildcard.
 350 * @RX_HANDLER_PASS: Do nothing, passe the skb as if no rx_handler was called.
 351 *
 352 * rx_handlers are functions called from inside __netif_receive_skb(), to do
 353 * special processing of the skb, prior to delivery to protocol handlers.
 354 *
 355 * Currently, a net_device can only have a single rx_handler registered. Trying
 356 * to register a second rx_handler will return -EBUSY.
 357 *
 358 * To register a rx_handler on a net_device, use netdev_rx_handler_register().
 359 * To unregister a rx_handler on a net_device, use
 360 * netdev_rx_handler_unregister().
 361 *
 362 * Upon return, rx_handler is expected to tell __netif_receive_skb() what to
 363 * do with the skb.
 364 *
 365 * If the rx_handler consumed to skb in some way, it should return
 366 * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for
 367 * the skb to be delivered in some other ways.
 368 *
 369 * If the rx_handler changed skb->dev, to divert the skb to another
 370 * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the
 371 * new device will be called if it exists.
 372 *
 373 * If the rx_handler consider the skb should be ignored, it should return
 374 * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that
 375 * are registered on exact device (ptype->dev == skb->dev).
 376 *
 377 * If the rx_handler didn't changed skb->dev, but want the skb to be normally
 378 * delivered, it should return RX_HANDLER_PASS.
 379 *
 380 * A device without a registered rx_handler will behave as if rx_handler
 381 * returned RX_HANDLER_PASS.
 382 */
 383
 384enum rx_handler_result {
 385        RX_HANDLER_CONSUMED,
 386        RX_HANDLER_ANOTHER,
 387        RX_HANDLER_EXACT,
 388        RX_HANDLER_PASS,
 389};
 390typedef enum rx_handler_result rx_handler_result_t;
 391typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);
 392
 393extern void __napi_schedule(struct napi_struct *n);
 394
 395static inline bool napi_disable_pending(struct napi_struct *n)
 396{
 397        return test_bit(NAPI_STATE_DISABLE, &n->state);
 398}
 399
 400/**
 401 *      napi_schedule_prep - check if napi can be scheduled
 402 *      @n: napi context
 403 *
 404 * Test if NAPI routine is already running, and if not mark
 405 * it as running.  This is used as a condition variable
 406 * insure only one NAPI poll instance runs.  We also make
 407 * sure there is no pending NAPI disable.
 408 */
 409static inline bool napi_schedule_prep(struct napi_struct *n)
 410{
 411        return !napi_disable_pending(n) &&
 412                !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
 413}
 414
 415/**
 416 *      napi_schedule - schedule NAPI poll
 417 *      @n: napi context
 418 *
 419 * Schedule NAPI poll routine to be called if it is not already
 420 * running.
 421 */
 422static inline void napi_schedule(struct napi_struct *n)
 423{
 424        if (napi_schedule_prep(n))
 425                __napi_schedule(n);
 426}
 427
 428/* Try to reschedule poll. Called by dev->poll() after napi_complete().  */
 429static inline bool napi_reschedule(struct napi_struct *napi)
 430{
 431        if (napi_schedule_prep(napi)) {
 432                __napi_schedule(napi);
 433                return true;
 434        }
 435        return false;
 436}
 437
 438/**
 439 *      napi_complete - NAPI processing complete
 440 *      @n: napi context
 441 *
 442 * Mark NAPI processing as complete.
 443 */
 444extern void __napi_complete(struct napi_struct *n);
 445extern void napi_complete(struct napi_struct *n);
 446
 447/**
 448 *      napi_disable - prevent NAPI from scheduling
 449 *      @n: napi context
 450 *
 451 * Stop NAPI from being scheduled on this context.
 452 * Waits till any outstanding processing completes.
 453 */
 454static inline void napi_disable(struct napi_struct *n)
 455{
 456        set_bit(NAPI_STATE_DISABLE, &n->state);
 457        while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
 458                msleep(1);
 459        clear_bit(NAPI_STATE_DISABLE, &n->state);
 460}
 461
 462/**
 463 *      napi_enable - enable NAPI scheduling
 464 *      @n: napi context
 465 *
 466 * Resume NAPI from being scheduled on this context.
 467 * Must be paired with napi_disable.
 468 */
 469static inline void napi_enable(struct napi_struct *n)
 470{
 471        BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
 472        smp_mb__before_clear_bit();
 473        clear_bit(NAPI_STATE_SCHED, &n->state);
 474}
 475
 476#ifdef CONFIG_SMP
 477/**
 478 *      napi_synchronize - wait until NAPI is not running
 479 *      @n: napi context
 480 *
 481 * Wait until NAPI is done being scheduled on this context.
 482 * Waits till any outstanding processing completes but
 483 * does not disable future activations.
 484 */
 485static inline void napi_synchronize(const struct napi_struct *n)
 486{
 487        while (test_bit(NAPI_STATE_SCHED, &n->state))
 488                msleep(1);
 489}
 490#else
 491# define napi_synchronize(n)    barrier()
 492#endif
 493
 494enum netdev_queue_state_t {
 495        __QUEUE_STATE_DRV_XOFF,
 496        __QUEUE_STATE_STACK_XOFF,
 497        __QUEUE_STATE_FROZEN,
 498#define QUEUE_STATE_ANY_XOFF ((1 << __QUEUE_STATE_DRV_XOFF)             | \
 499                              (1 << __QUEUE_STATE_STACK_XOFF))
 500#define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF            | \
 501                                        (1 << __QUEUE_STATE_FROZEN))
 502};
 503/*
 504 * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue.  The
 505 * netif_tx_* functions below are used to manipulate this flag.  The
 506 * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit
 507 * queue independently.  The netif_xmit_*stopped functions below are called
 508 * to check if the queue has been stopped by the driver or stack (either
 509 * of the XOFF bits are set in the state).  Drivers should not need to call
 510 * netif_xmit*stopped functions, they should only be using netif_tx_*.
 511 */
 512
 513struct netdev_queue {
 514/*
 515 * read mostly part
 516 */
 517        struct net_device       *dev;
 518        struct Qdisc            *qdisc;
 519        struct Qdisc            *qdisc_sleeping;
 520#ifdef CONFIG_SYSFS
 521        struct kobject          kobj;
 522#endif
 523#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
 524        int                     numa_node;
 525#endif
 526/*
 527 * write mostly part
 528 */
 529        spinlock_t              _xmit_lock ____cacheline_aligned_in_smp;
 530        int                     xmit_lock_owner;
 531        /*
 532         * please use this field instead of dev->trans_start
 533         */
 534        unsigned long           trans_start;
 535
 536        /*
 537         * Number of TX timeouts for this queue
 538         * (/sys/class/net/DEV/Q/trans_timeout)
 539         */
 540        unsigned long           trans_timeout;
 541
 542        unsigned long           state;
 543
 544#ifdef CONFIG_BQL
 545        struct dql              dql;
 546#endif
 547} ____cacheline_aligned_in_smp;
 548
 549static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
 550{
 551#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
 552        return q->numa_node;
 553#else
 554        return NUMA_NO_NODE;
 555#endif
 556}
 557
 558static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node)
 559{
 560#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
 561        q->numa_node = node;
 562#endif
 563}
 564
 565#ifdef CONFIG_RPS
 566/*
 567 * This structure holds an RPS map which can be of variable length.  The
 568 * map is an array of CPUs.
 569 */
 570struct rps_map {
 571        unsigned int len;
 572        struct rcu_head rcu;
 573        u16 cpus[0];
 574};
 575#define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16)))
 576
 577/*
 578 * The rps_dev_flow structure contains the mapping of a flow to a CPU, the
 579 * tail pointer for that CPU's input queue at the time of last enqueue, and
 580 * a hardware filter index.
 581 */
 582struct rps_dev_flow {
 583        u16 cpu;
 584        u16 filter;
 585        unsigned int last_qtail;
 586};
 587#define RPS_NO_FILTER 0xffff
 588
 589/*
 590 * The rps_dev_flow_table structure contains a table of flow mappings.
 591 */
 592struct rps_dev_flow_table {
 593        unsigned int mask;
 594        struct rcu_head rcu;
 595        struct work_struct free_work;
 596        struct rps_dev_flow flows[0];
 597};
 598#define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
 599    ((_num) * sizeof(struct rps_dev_flow)))
 600
 601/*
 602 * The rps_sock_flow_table contains mappings of flows to the last CPU
 603 * on which they were processed by the application (set in recvmsg).
 604 */
 605struct rps_sock_flow_table {
 606        unsigned int mask;
 607        u16 ents[0];
 608};
 609#define RPS_SOCK_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_sock_flow_table) + \
 610    ((_num) * sizeof(u16)))
 611
 612#define RPS_NO_CPU 0xffff
 613
 614static inline void rps_record_sock_flow(struct rps_sock_flow_table *table,
 615                                        u32 hash)
 616{
 617        if (table && hash) {
 618                unsigned int cpu, index = hash & table->mask;
 619
 620                /* We only give a hint, preemption can change cpu under us */
 621                cpu = raw_smp_processor_id();
 622
 623                if (table->ents[index] != cpu)
 624                        table->ents[index] = cpu;
 625        }
 626}
 627
 628static inline void rps_reset_sock_flow(struct rps_sock_flow_table *table,
 629                                       u32 hash)
 630{
 631        if (table && hash)
 632                table->ents[hash & table->mask] = RPS_NO_CPU;
 633}
 634
 635extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;
 636
 637#ifdef CONFIG_RFS_ACCEL
 638extern bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
 639                                u32 flow_id, u16 filter_id);
 640#endif
 641
 642/* This structure contains an instance of an RX queue. */
 643struct netdev_rx_queue {
 644        struct rps_map __rcu            *rps_map;
 645        struct rps_dev_flow_table __rcu *rps_flow_table;
 646        struct kobject                  kobj;
 647        struct net_device               *dev;
 648} ____cacheline_aligned_in_smp;
 649#endif /* CONFIG_RPS */
 650
 651#ifdef CONFIG_XPS
 652/*
 653 * This structure holds an XPS map which can be of variable length.  The
 654 * map is an array of queues.
 655 */
 656struct xps_map {
 657        unsigned int len;
 658        unsigned int alloc_len;
 659        struct rcu_head rcu;
 660        u16 queues[0];
 661};
 662#define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16)))
 663#define XPS_MIN_MAP_ALLOC ((L1_CACHE_BYTES - sizeof(struct xps_map))    \
 664    / sizeof(u16))
 665
 666/*
 667 * This structure holds all XPS maps for device.  Maps are indexed by CPU.
 668 */
 669struct xps_dev_maps {
 670        struct rcu_head rcu;
 671        struct xps_map __rcu *cpu_map[0];
 672};
 673#define XPS_DEV_MAPS_SIZE (sizeof(struct xps_dev_maps) +                \
 674    (nr_cpu_ids * sizeof(struct xps_map *)))
 675#endif /* CONFIG_XPS */
 676
 677#define TC_MAX_QUEUE    16
 678#define TC_BITMASK      15
 679/* HW offloaded queuing disciplines txq count and offset maps */
 680struct netdev_tc_txq {
 681        u16 count;
 682        u16 offset;
 683};
 684
 685#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 686/*
 687 * This structure is to hold information about the device
 688 * configured to run FCoE protocol stack.
 689 */
 690struct netdev_fcoe_hbainfo {
 691        char    manufacturer[64];
 692        char    serial_number[64];
 693        char    hardware_version[64];
 694        char    driver_version[64];
 695        char    optionrom_version[64];
 696        char    firmware_version[64];
 697        char    model[256];
 698        char    model_description[256];
 699};
 700#endif
 701
 702/*
 703 * This structure defines the management hooks for network devices.
 704 * The following hooks can be defined; unless noted otherwise, they are
 705 * optional and can be filled with a null pointer.
 706 *
 707 * int (*ndo_init)(struct net_device *dev);
 708 *     This function is called once when network device is registered.
 709 *     The network device can use this to any late stage initializaton
 710 *     or semantic validattion. It can fail with an error code which will
 711 *     be propogated back to register_netdev
 712 *
 713 * void (*ndo_uninit)(struct net_device *dev);
 714 *     This function is called when device is unregistered or when registration
 715 *     fails. It is not called if init fails.
 716 *
 717 * int (*ndo_open)(struct net_device *dev);
 718 *     This function is called when network device transistions to the up
 719 *     state.
 720 *
 721 * int (*ndo_stop)(struct net_device *dev);
 722 *     This function is called when network device transistions to the down
 723 *     state.
 724 *
 725 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
 726 *                               struct net_device *dev);
 727 *      Called when a packet needs to be transmitted.
 728 *      Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
 729 *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
 730 *      Required can not be NULL.
 731 *
 732 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
 733 *      Called to decide which queue to when device supports multiple
 734 *      transmit queues.
 735 *
 736 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
 737 *      This function is called to allow device receiver to make
 738 *      changes to configuration when multicast or promiscious is enabled.
 739 *
 740 * void (*ndo_set_rx_mode)(struct net_device *dev);
 741 *      This function is called device changes address list filtering.
 742 *      If driver handles unicast address filtering, it should set
 743 *      IFF_UNICAST_FLT to its priv_flags.
 744 *
 745 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
 746 *      This function  is called when the Media Access Control address
 747 *      needs to be changed. If this interface is not defined, the
 748 *      mac address can not be changed.
 749 *
 750 * int (*ndo_validate_addr)(struct net_device *dev);
 751 *      Test if Media Access Control address is valid for the device.
 752 *
 753 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
 754 *      Called when a user request an ioctl which can't be handled by
 755 *      the generic interface code. If not defined ioctl's return
 756 *      not supported error code.
 757 *
 758 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
 759 *      Used to set network devices bus interface parameters. This interface
 760 *      is retained for legacy reason, new devices should use the bus
 761 *      interface (PCI) for low level management.
 762 *
 763 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
 764 *      Called when a user wants to change the Maximum Transfer Unit
 765 *      of a device. If not defined, any request to change MTU will
 766 *      will return an error.
 767 *
 768 * void (*ndo_tx_timeout)(struct net_device *dev);
 769 *      Callback uses when the transmitter has not made any progress
 770 *      for dev->watchdog ticks.
 771 *
 772 * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
 773 *                      struct rtnl_link_stats64 *storage);
 774 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
 775 *      Called when a user wants to get the network device usage
 776 *      statistics. Drivers must do one of the following:
 777 *      1. Define @ndo_get_stats64 to fill in a zero-initialised
 778 *         rtnl_link_stats64 structure passed by the caller.
 779 *      2. Define @ndo_get_stats to update a net_device_stats structure
 780 *         (which should normally be dev->stats) and return a pointer to
 781 *         it. The structure may be changed asynchronously only if each
 782 *         field is written atomically.
 783 *      3. Update dev->stats asynchronously and atomically, and define
 784 *         neither operation.
 785 *
 786 * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid);
 787 *      If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
 788 *      this function is called when a VLAN id is registered.
 789 *
 790 * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
 791 *      If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
 792 *      this function is called when a VLAN id is unregistered.
 793 *
 794 * void (*ndo_poll_controller)(struct net_device *dev);
 795 *
 796 *      SR-IOV management functions.
 797 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
 798 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos);
 799 * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate);
 800 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
 801 * int (*ndo_get_vf_config)(struct net_device *dev,
 802 *                          int vf, struct ifla_vf_info *ivf);
 803 * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
 804 *                        struct nlattr *port[]);
 805 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
 806 * int (*ndo_setup_tc)(struct net_device *dev, u8 tc)
 807 *      Called to setup 'tc' number of traffic classes in the net device. This
 808 *      is always called from the stack with the rtnl lock held and netif tx
 809 *      queues stopped. This allows the netdevice to perform queue management
 810 *      safely.
 811 *
 812 *      Fiber Channel over Ethernet (FCoE) offload functions.
 813 * int (*ndo_fcoe_enable)(struct net_device *dev);
 814 *      Called when the FCoE protocol stack wants to start using LLD for FCoE
 815 *      so the underlying device can perform whatever needed configuration or
 816 *      initialization to support acceleration of FCoE traffic.
 817 *
 818 * int (*ndo_fcoe_disable)(struct net_device *dev);
 819 *      Called when the FCoE protocol stack wants to stop using LLD for FCoE
 820 *      so the underlying device can perform whatever needed clean-ups to
 821 *      stop supporting acceleration of FCoE traffic.
 822 *
 823 * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid,
 824 *                           struct scatterlist *sgl, unsigned int sgc);
 825 *      Called when the FCoE Initiator wants to initialize an I/O that
 826 *      is a possible candidate for Direct Data Placement (DDP). The LLD can
 827 *      perform necessary setup and returns 1 to indicate the device is set up
 828 *      successfully to perform DDP on this I/O, otherwise this returns 0.
 829 *
 830 * int (*ndo_fcoe_ddp_done)(struct net_device *dev,  u16 xid);
 831 *      Called when the FCoE Initiator/Target is done with the DDPed I/O as
 832 *      indicated by the FC exchange id 'xid', so the underlying device can
 833 *      clean up and reuse resources for later DDP requests.
 834 *
 835 * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid,
 836 *                            struct scatterlist *sgl, unsigned int sgc);
 837 *      Called when the FCoE Target wants to initialize an I/O that
 838 *      is a possible candidate for Direct Data Placement (DDP). The LLD can
 839 *      perform necessary setup and returns 1 to indicate the device is set up
 840 *      successfully to perform DDP on this I/O, otherwise this returns 0.
 841 *
 842 * int (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
 843 *                             struct netdev_fcoe_hbainfo *hbainfo);
 844 *      Called when the FCoE Protocol stack wants information on the underlying
 845 *      device. This information is utilized by the FCoE protocol stack to
 846 *      register attributes with Fiber Channel management service as per the
 847 *      FC-GS Fabric Device Management Information(FDMI) specification.
 848 *
 849 * int (*ndo_fcoe_get_wwn)(struct net_device *dev, u64 *wwn, int type);
 850 *      Called when the underlying device wants to override default World Wide
 851 *      Name (WWN) generation mechanism in FCoE protocol stack to pass its own
 852 *      World Wide Port Name (WWPN) or World Wide Node Name (WWNN) to the FCoE
 853 *      protocol stack to use.
 854 *
 855 *      RFS acceleration.
 856 * int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb,
 857 *                          u16 rxq_index, u32 flow_id);
 858 *      Set hardware filter for RFS.  rxq_index is the target queue index;
 859 *      flow_id is a flow ID to be passed to rps_may_expire_flow() later.
 860 *      Return the filter ID on success, or a negative error code.
 861 *
 862 *      Slave management functions (for bridge, bonding, etc). User should
 863 *      call netdev_set_master() to set dev->master properly.
 864 * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev);
 865 *      Called to make another netdev an underling.
 866 *
 867 * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev);
 868 *      Called to release previously enslaved netdev.
 869 *
 870 *      Feature/offload setting functions.
 871 * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
 872 *              netdev_features_t features);
 873 *      Adjusts the requested feature flags according to device-specific
 874 *      constraints, and returns the resulting flags. Must not modify
 875 *      the device state.
 876 *
 877 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
 878 *      Called to update device configuration to new features. Passed
 879 *      feature set might be less than what was returned by ndo_fix_features()).
 880 *      Must return >0 or -errno if it changed dev->features itself.
 881 *
 882 * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[],
 883 *                    struct net_device *dev,
 884 *                    const unsigned char *addr, u16 flags)
 885 *      Adds an FDB entry to dev for addr.
 886 * int (*ndo_fdb_del)(struct ndmsg *ndm, struct net_device *dev,
 887 *                    const unsigned char *addr)
 888 *      Deletes the FDB entry from dev coresponding to addr.
 889 * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb,
 890 *                     struct net_device *dev, int idx)
 891 *      Used to add FDB entries to dump requests. Implementers should add
 892 *      entries to skb and update idx with the number of entries.
 893 *
 894 * int (*ndo_bridge_setlink)(struct net_device *dev, struct nlmsghdr *nlh)
 895 * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq,
 896 *                           struct net_device *dev)
 897 */
 898struct net_device_ops {
 899        int                     (*ndo_init)(struct net_device *dev);
 900        void                    (*ndo_uninit)(struct net_device *dev);
 901        int                     (*ndo_open)(struct net_device *dev);
 902        int                     (*ndo_stop)(struct net_device *dev);
 903        netdev_tx_t             (*ndo_start_xmit) (struct sk_buff *skb,
 904                                                   struct net_device *dev);
 905        u16                     (*ndo_select_queue)(struct net_device *dev,
 906                                                    struct sk_buff *skb);
 907        void                    (*ndo_change_rx_flags)(struct net_device *dev,
 908                                                       int flags);
 909        void                    (*ndo_set_rx_mode)(struct net_device *dev);
 910        int                     (*ndo_set_mac_address)(struct net_device *dev,
 911                                                       void *addr);
 912        int                     (*ndo_validate_addr)(struct net_device *dev);
 913        int                     (*ndo_do_ioctl)(struct net_device *dev,
 914                                                struct ifreq *ifr, int cmd);
 915        int                     (*ndo_set_config)(struct net_device *dev,
 916                                                  struct ifmap *map);
 917        int                     (*ndo_change_mtu)(struct net_device *dev,
 918                                                  int new_mtu);
 919        int                     (*ndo_neigh_setup)(struct net_device *dev,
 920                                                   struct neigh_parms *);
 921        void                    (*ndo_tx_timeout) (struct net_device *dev);
 922
 923        struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
 924                                                     struct rtnl_link_stats64 *storage);
 925        struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
 926
 927        int                     (*ndo_vlan_rx_add_vid)(struct net_device *dev,
 928                                                       unsigned short vid);
 929        int                     (*ndo_vlan_rx_kill_vid)(struct net_device *dev,
 930                                                        unsigned short vid);
 931#ifdef CONFIG_NET_POLL_CONTROLLER
 932        void                    (*ndo_poll_controller)(struct net_device *dev);
 933        int                     (*ndo_netpoll_setup)(struct net_device *dev,
 934                                                     struct netpoll_info *info,
 935                                                     gfp_t gfp);
 936        void                    (*ndo_netpoll_cleanup)(struct net_device *dev);
 937#endif
 938        int                     (*ndo_set_vf_mac)(struct net_device *dev,
 939                                                  int queue, u8 *mac);
 940        int                     (*ndo_set_vf_vlan)(struct net_device *dev,
 941                                                   int queue, u16 vlan, u8 qos);
 942        int                     (*ndo_set_vf_tx_rate)(struct net_device *dev,
 943                                                      int vf, int rate);
 944        int                     (*ndo_set_vf_spoofchk)(struct net_device *dev,
 945                                                       int vf, bool setting);
 946        int                     (*ndo_get_vf_config)(struct net_device *dev,
 947                                                     int vf,
 948                                                     struct ifla_vf_info *ivf);
 949        int                     (*ndo_set_vf_port)(struct net_device *dev,
 950                                                   int vf,
 951                                                   struct nlattr *port[]);
 952        int                     (*ndo_get_vf_port)(struct net_device *dev,
 953                                                   int vf, struct sk_buff *skb);
 954        int                     (*ndo_setup_tc)(struct net_device *dev, u8 tc);
 955#if IS_ENABLED(CONFIG_FCOE)
 956        int                     (*ndo_fcoe_enable)(struct net_device *dev);
 957        int                     (*ndo_fcoe_disable)(struct net_device *dev);
 958        int                     (*ndo_fcoe_ddp_setup)(struct net_device *dev,
 959                                                      u16 xid,
 960                                                      struct scatterlist *sgl,
 961                                                      unsigned int sgc);
 962        int                     (*ndo_fcoe_ddp_done)(struct net_device *dev,
 963                                                     u16 xid);
 964        int                     (*ndo_fcoe_ddp_target)(struct net_device *dev,
 965                                                       u16 xid,
 966                                                       struct scatterlist *sgl,
 967                                                       unsigned int sgc);
 968        int                     (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
 969                                                        struct netdev_fcoe_hbainfo *hbainfo);
 970#endif
 971
 972#if IS_ENABLED(CONFIG_LIBFCOE)
 973#define NETDEV_FCOE_WWNN 0
 974#define NETDEV_FCOE_WWPN 1
 975        int                     (*ndo_fcoe_get_wwn)(struct net_device *dev,
 976                                                    u64 *wwn, int type);
 977#endif
 978
 979#ifdef CONFIG_RFS_ACCEL
 980        int                     (*ndo_rx_flow_steer)(struct net_device *dev,
 981                                                     const struct sk_buff *skb,
 982                                                     u16 rxq_index,
 983                                                     u32 flow_id);
 984#endif
 985        int                     (*ndo_add_slave)(struct net_device *dev,
 986                                                 struct net_device *slave_dev);
 987        int                     (*ndo_del_slave)(struct net_device *dev,
 988                                                 struct net_device *slave_dev);
 989        netdev_features_t       (*ndo_fix_features)(struct net_device *dev,
 990                                                    netdev_features_t features);
 991        int                     (*ndo_set_features)(struct net_device *dev,
 992                                                    netdev_features_t features);
 993        int                     (*ndo_neigh_construct)(struct neighbour *n);
 994        void                    (*ndo_neigh_destroy)(struct neighbour *n);
 995
 996        int                     (*ndo_fdb_add)(struct ndmsg *ndm,
 997                                               struct nlattr *tb[],
 998                                               struct net_device *dev,
 999                                               const unsigned char *addr,
1000                                               u16 flags);
1001        int                     (*ndo_fdb_del)(struct ndmsg *ndm,
1002                                               struct net_device *dev,
1003                                               const unsigned char *addr);
1004        int                     (*ndo_fdb_dump)(struct sk_buff *skb,
1005                                                struct netlink_callback *cb,
1006                                                struct net_device *dev,
1007                                                int idx);
1008
1009        int                     (*ndo_bridge_setlink)(struct net_device *dev,
1010                                                      struct nlmsghdr *nlh);
1011        int                     (*ndo_bridge_getlink)(struct sk_buff *skb,
1012                                                      u32 pid, u32 seq,
1013                                                      struct net_device *dev);
1014};
1015
1016/*
1017 *      The DEVICE structure.
1018 *      Actually, this whole structure is a big mistake.  It mixes I/O
1019 *      data with strictly "high-level" data, and it has to know about
1020 *      almost every data structure used in the INET module.
1021 *
1022 *      FIXME: cleanup struct net_device such that network protocol info
1023 *      moves out.
1024 */
1025
1026struct net_device {
1027
1028        /*
1029         * This is the first field of the "visible" part of this structure
1030         * (i.e. as seen by users in the "Space.c" file).  It is the name
1031         * of the interface.
1032         */
1033        char                    name[IFNAMSIZ];
1034
1035        /* device name hash chain, please keep it close to name[] */
1036        struct hlist_node       name_hlist;
1037
1038        /* snmp alias */
1039        char                    *ifalias;
1040
1041        /*
1042         *      I/O specific fields
1043         *      FIXME: Merge these and struct ifmap into one
1044         */
1045        unsigned long           mem_end;        /* shared mem end       */
1046        unsigned long           mem_start;      /* shared mem start     */
1047        unsigned long           base_addr;      /* device I/O address   */
1048        unsigned int            irq;            /* device IRQ number    */
1049
1050        /*
1051         *      Some hardware also needs these fields, but they are not
1052         *      part of the usual set specified in Space.c.
1053         */
1054
1055        unsigned long           state;
1056
1057        struct list_head        dev_list;
1058        struct list_head        napi_list;
1059        struct list_head        unreg_list;
1060
1061        /* currently active device features */
1062        netdev_features_t       features;
1063        /* user-changeable features */
1064        netdev_features_t       hw_features;
1065        /* user-requested features */
1066        netdev_features_t       wanted_features;
1067        /* mask of features inheritable by VLAN devices */
1068        netdev_features_t       vlan_features;
1069        /* mask of features inherited by encapsulating devices
1070         * This field indicates what encapsulation offloads
1071         * the hardware is capable of doing, and drivers will
1072         * need to set them appropriately.
1073         */
1074        netdev_features_t       hw_enc_features;
1075
1076        /* Interface index. Unique device identifier    */
1077        int                     ifindex;
1078        int                     iflink;
1079
1080        struct net_device_stats stats;
1081        atomic_long_t           rx_dropped; /* dropped packets by core network
1082                                             * Do not use this in drivers.
1083                                             */
1084
1085#ifdef CONFIG_WIRELESS_EXT
1086        /* List of functions to handle Wireless Extensions (instead of ioctl).
1087         * See <net/iw_handler.h> for details. Jean II */
1088        const struct iw_handler_def *   wireless_handlers;
1089        /* Instance data managed by the core of Wireless Extensions. */
1090        struct iw_public_data * wireless_data;
1091#endif
1092        /* Management operations */
1093        const struct net_device_ops *netdev_ops;
1094        const struct ethtool_ops *ethtool_ops;
1095
1096        /* Hardware header description */
1097        const struct header_ops *header_ops;
1098
1099        unsigned int            flags;  /* interface flags (a la BSD)   */
1100        unsigned int            priv_flags; /* Like 'flags' but invisible to userspace.
1101                                             * See if.h for definitions. */
1102        unsigned short          gflags;
1103        unsigned short          padded; /* How much padding added by alloc_netdev() */
1104
1105        unsigned char           operstate; /* RFC2863 operstate */
1106        unsigned char           link_mode; /* mapping policy to operstate */
1107
1108        unsigned char           if_port;        /* Selectable AUI, TP,..*/
1109        unsigned char           dma;            /* DMA channel          */
1110
1111        unsigned int            mtu;    /* interface MTU value          */
1112        unsigned short          type;   /* interface hardware type      */
1113        unsigned short          hard_header_len;        /* hardware hdr length  */
1114
1115        /* extra head- and tailroom the hardware may need, but not in all cases
1116         * can this be guaranteed, especially tailroom. Some cases also use
1117         * LL_MAX_HEADER instead to allocate the skb.
1118         */
1119        unsigned short          needed_headroom;
1120        unsigned short          needed_tailroom;
1121
1122        /* Interface address info. */
1123        unsigned char           perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
1124        unsigned char           addr_assign_type; /* hw address assignment type */
1125        unsigned char           addr_len;       /* hardware address length      */
1126        unsigned char           neigh_priv_len;
1127        unsigned short          dev_id;         /* for shared network cards */
1128
1129        spinlock_t              addr_list_lock;
1130        struct netdev_hw_addr_list      uc;     /* Unicast mac addresses */
1131        struct netdev_hw_addr_list      mc;     /* Multicast mac addresses */
1132        bool                    uc_promisc;
1133        unsigned int            promiscuity;
1134        unsigned int            allmulti;
1135
1136
1137        /* Protocol specific pointers */
1138
1139#if IS_ENABLED(CONFIG_VLAN_8021Q)
1140        struct vlan_info __rcu  *vlan_info;     /* VLAN info */
1141#endif
1142#if IS_ENABLED(CONFIG_NET_DSA)
1143        struct dsa_switch_tree  *dsa_ptr;       /* dsa specific data */
1144#endif
1145        void                    *atalk_ptr;     /* AppleTalk link       */
1146        struct in_device __rcu  *ip_ptr;        /* IPv4 specific data   */
1147        struct dn_dev __rcu     *dn_ptr;        /* DECnet specific data */
1148        struct inet6_dev __rcu  *ip6_ptr;       /* IPv6 specific data */
1149        void                    *ax25_ptr;      /* AX.25 specific data */
1150        struct wireless_dev     *ieee80211_ptr; /* IEEE 802.11 specific data,
1151                                                   assign before registering */
1152
1153/*
1154 * Cache lines mostly used on receive path (including eth_type_trans())
1155 */
1156        unsigned long           last_rx;        /* Time of last Rx
1157                                                 * This should not be set in
1158                                                 * drivers, unless really needed,
1159                                                 * because network stack (bonding)
1160                                                 * use it if/when necessary, to
1161                                                 * avoid dirtying this cache line.
1162                                                 */
1163
1164        struct net_device       *master; /* Pointer to master device of a group,
1165                                          * which this device is member of.
1166                                          */
1167
1168        /* Interface address info used in eth_type_trans() */
1169        unsigned char           *dev_addr;      /* hw address, (before bcast
1170                                                   because most packets are
1171                                                   unicast) */
1172
1173        struct netdev_hw_addr_list      dev_addrs; /* list of device
1174                                                      hw addresses */
1175
1176        unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
1177
1178#ifdef CONFIG_SYSFS
1179        struct kset             *queues_kset;
1180#endif
1181
1182#ifdef CONFIG_RPS
1183        struct netdev_rx_queue  *_rx;
1184
1185        /* Number of RX queues allocated at register_netdev() time */
1186        unsigned int            num_rx_queues;
1187
1188        /* Number of RX queues currently active in device */
1189        unsigned int            real_num_rx_queues;
1190
1191#ifdef CONFIG_RFS_ACCEL
1192        /* CPU reverse-mapping for RX completion interrupts, indexed
1193         * by RX queue number.  Assigned by driver.  This must only be
1194         * set if the ndo_rx_flow_steer operation is defined. */
1195        struct cpu_rmap         *rx_cpu_rmap;
1196#endif
1197#endif
1198
1199        rx_handler_func_t __rcu *rx_handler;
1200        void __rcu              *rx_handler_data;
1201
1202        struct netdev_queue __rcu *ingress_queue;
1203
1204/*
1205 * Cache lines mostly used on transmit path
1206 */
1207        struct netdev_queue     *_tx ____cacheline_aligned_in_smp;
1208
1209        /* Number of TX queues allocated at alloc_netdev_mq() time  */
1210        unsigned int            num_tx_queues;
1211
1212        /* Number of TX queues currently active in device  */
1213        unsigned int            real_num_tx_queues;
1214
1215        /* root qdisc from userspace point of view */
1216        struct Qdisc            *qdisc;
1217
1218        unsigned long           tx_queue_len;   /* Max frames per queue allowed */
1219        spinlock_t              tx_global_lock;
1220
1221#ifdef CONFIG_XPS
1222        struct xps_dev_maps __rcu *xps_maps;
1223#endif
1224
1225        /* These may be needed for future network-power-down code. */
1226
1227        /*
1228         * trans_start here is expensive for high speed devices on SMP,
1229         * please use netdev_queue->trans_start instead.
1230         */
1231        unsigned long           trans_start;    /* Time (in jiffies) of last Tx */
1232
1233        int                     watchdog_timeo; /* used by dev_watchdog() */
1234        struct timer_list       watchdog_timer;
1235
1236        /* Number of references to this device */
1237        int __percpu            *pcpu_refcnt;
1238
1239        /* delayed register/unregister */
1240        struct list_head        todo_list;
1241        /* device index hash chain */
1242        struct hlist_node       index_hlist;
1243
1244        struct list_head        link_watch_list;
1245
1246        /* register/unregister state machine */
1247        enum { NETREG_UNINITIALIZED=0,
1248               NETREG_REGISTERED,       /* completed register_netdevice */
1249               NETREG_UNREGISTERING,    /* called unregister_netdevice */
1250               NETREG_UNREGISTERED,     /* completed unregister todo */
1251               NETREG_RELEASED,         /* called free_netdev */
1252               NETREG_DUMMY,            /* dummy device for NAPI poll */
1253        } reg_state:8;
1254
1255        bool dismantle; /* device is going do be freed */
1256
1257        enum {
1258                RTNL_LINK_INITIALIZED,
1259                RTNL_LINK_INITIALIZING,
1260        } rtnl_link_state:16;
1261
1262        /* Called from unregister, can be used to call free_netdev */
1263        void (*destructor)(struct net_device *dev);
1264
1265#ifdef CONFIG_NETPOLL
1266        struct netpoll_info     *npinfo;
1267#endif
1268
1269#ifdef CONFIG_NET_NS
1270        /* Network namespace this network device is inside */
1271        struct net              *nd_net;
1272#endif
1273
1274        /* mid-layer private */
1275        union {
1276                void                            *ml_priv;
1277                struct pcpu_lstats __percpu     *lstats; /* loopback stats */
1278                struct pcpu_tstats __percpu     *tstats; /* tunnel stats */
1279                struct pcpu_dstats __percpu     *dstats; /* dummy stats */
1280        };
1281        /* GARP */
1282        struct garp_port __rcu  *garp_port;
1283
1284        /* class/net/name entry */
1285        struct device           dev;
1286        /* space for optional device, statistics, and wireless sysfs groups */
1287        const struct attribute_group *sysfs_groups[4];
1288
1289        /* rtnetlink link ops */
1290        const struct rtnl_link_ops *rtnl_link_ops;
1291
1292        /* for setting kernel sock attribute on TCP connection setup */
1293#define GSO_MAX_SIZE            65536
1294        unsigned int            gso_max_size;
1295#define GSO_MAX_SEGS            65535
1296        u16                     gso_max_segs;
1297
1298#ifdef CONFIG_DCB
1299        /* Data Center Bridging netlink ops */
1300        const struct dcbnl_rtnl_ops *dcbnl_ops;
1301#endif
1302        u8 num_tc;
1303        struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
1304        u8 prio_tc_map[TC_BITMASK + 1];
1305
1306#if IS_ENABLED(CONFIG_FCOE)
1307        /* max exchange id for FCoE LRO by ddp */
1308        unsigned int            fcoe_ddp_xid;
1309#endif
1310#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
1311        struct netprio_map __rcu *priomap;
1312#endif
1313        /* phy device may attach itself for hardware timestamping */
1314        struct phy_device *phydev;
1315
1316        struct lock_class_key *qdisc_tx_busylock;
1317
1318        /* group the device belongs to */
1319        int group;
1320
1321        struct pm_qos_request   pm_qos_req;
1322};
1323#define to_net_dev(d) container_of(d, struct net_device, dev)
1324
1325#define NETDEV_ALIGN            32
1326
1327static inline
1328int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio)
1329{
1330        return dev->prio_tc_map[prio & TC_BITMASK];
1331}
1332
1333static inline
1334int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc)
1335{
1336        if (tc >= dev->num_tc)
1337                return -EINVAL;
1338
1339        dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK;
1340        return 0;
1341}
1342
1343static inline
1344void netdev_reset_tc(struct net_device *dev)
1345{
1346        dev->num_tc = 0;
1347        memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq));
1348        memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map));
1349}
1350
1351static inline
1352int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset)
1353{
1354        if (tc >= dev->num_tc)
1355                return -EINVAL;
1356
1357        dev->tc_to_txq[tc].count = count;
1358        dev->tc_to_txq[tc].offset = offset;
1359        return 0;
1360}
1361
1362static inline
1363int netdev_set_num_tc(struct net_device *dev, u8 num_tc)
1364{
1365        if (num_tc > TC_MAX_QUEUE)
1366                return -EINVAL;
1367
1368        dev->num_tc = num_tc;
1369        return 0;
1370}
1371
1372static inline
1373int netdev_get_num_tc(struct net_device *dev)
1374{
1375        return dev->num_tc;
1376}
1377
1378static inline
1379struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
1380                                         unsigned int index)
1381{
1382        return &dev->_tx[index];
1383}
1384
1385static inline void netdev_for_each_tx_queue(struct net_device *dev,
1386                                            void (*f)(struct net_device *,
1387                                                      struct netdev_queue *,
1388                                                      void *),
1389                                            void *arg)
1390{
1391        unsigned int i;
1392
1393        for (i = 0; i < dev->num_tx_queues; i++)
1394                f(dev, &dev->_tx[i], arg);
1395}
1396
1397extern struct netdev_queue *netdev_pick_tx(struct net_device *dev,
1398                                           struct sk_buff *skb);
1399
1400/*
1401 * Net namespace inlines
1402 */
1403static inline
1404struct net *dev_net(const struct net_device *dev)
1405{
1406        return read_pnet(&dev->nd_net);
1407}
1408
1409static inline
1410void dev_net_set(struct net_device *dev, struct net *net)
1411{
1412#ifdef CONFIG_NET_NS
1413        release_net(dev->nd_net);
1414        dev->nd_net = hold_net(net);
1415#endif
1416}
1417
1418static inline bool netdev_uses_dsa_tags(struct net_device *dev)
1419{
1420#ifdef CONFIG_NET_DSA_TAG_DSA
1421        if (dev->dsa_ptr != NULL)
1422                return dsa_uses_dsa_tags(dev->dsa_ptr);
1423#endif
1424
1425        return 0;
1426}
1427
1428static inline bool netdev_uses_trailer_tags(struct net_device *dev)
1429{
1430#ifdef CONFIG_NET_DSA_TAG_TRAILER
1431        if (dev->dsa_ptr != NULL)
1432                return dsa_uses_trailer_tags(dev->dsa_ptr);
1433#endif
1434
1435        return 0;
1436}
1437
1438/**
1439 *      netdev_priv - access network device private data
1440 *      @dev: network device
1441 *
1442 * Get network device private data
1443 */
1444static inline void *netdev_priv(const struct net_device *dev)
1445{
1446        return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
1447}
1448
1449/* Set the sysfs physical device reference for the network logical device
1450 * if set prior to registration will cause a symlink during initialization.
1451 */
1452#define SET_NETDEV_DEV(net, pdev)       ((net)->dev.parent = (pdev))
1453
1454/* Set the sysfs device type for the network logical device to allow
1455 * fin grained indentification of different network device types. For
1456 * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
1457 */
1458#define SET_NETDEV_DEVTYPE(net, devtype)        ((net)->dev.type = (devtype))
1459
1460/**
1461 *      netif_napi_add - initialize a napi context
1462 *      @dev:  network device
1463 *      @napi: napi context
1464 *      @poll: polling function
1465 *      @weight: default weight
1466 *
1467 * netif_napi_add() must be used to initialize a napi context prior to calling
1468 * *any* of the other napi related functions.
1469 */
1470void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
1471                    int (*poll)(struct napi_struct *, int), int weight);
1472
1473/**
1474 *  netif_napi_del - remove a napi context
1475 *  @napi: napi context
1476 *
1477 *  netif_napi_del() removes a napi context from the network device napi list
1478 */
1479void netif_napi_del(struct napi_struct *napi);
1480
1481struct napi_gro_cb {
1482        /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
1483        void *frag0;
1484
1485        /* Length of frag0. */
1486        unsigned int frag0_len;
1487
1488        /* This indicates where we are processing relative to skb->data. */
1489        int data_offset;
1490
1491        /* This is non-zero if the packet cannot be merged with the new skb. */
1492        int flush;
1493
1494        /* Number of segments aggregated. */
1495        u16     count;
1496
1497        /* This is non-zero if the packet may be of the same flow. */
1498        u8      same_flow;
1499
1500        /* Free the skb? */
1501        u8      free;
1502#define NAPI_GRO_FREE             1
1503#define NAPI_GRO_FREE_STOLEN_HEAD 2
1504
1505        /* jiffies when first packet was created/queued */
1506        unsigned long age;
1507
1508        /* Used in ipv6_gro_receive() */
1509        int     proto;
1510
1511        /* used in skb_gro_receive() slow path */
1512        struct sk_buff *last;
1513};
1514
1515#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1516
1517struct packet_type {
1518        __be16                  type;   /* This is really htons(ether_type). */
1519        struct net_device       *dev;   /* NULL is wildcarded here           */
1520        int                     (*func) (struct sk_buff *,
1521                                         struct net_device *,
1522                                         struct packet_type *,
1523                                         struct net_device *);
1524        bool                    (*id_match)(struct packet_type *ptype,
1525                                            struct sock *sk);
1526        void                    *af_packet_priv;
1527        struct list_head        list;
1528};
1529
1530struct offload_callbacks {
1531        struct sk_buff          *(*gso_segment)(struct sk_buff *skb,
1532                                                netdev_features_t features);
1533        int                     (*gso_send_check)(struct sk_buff *skb);
1534        struct sk_buff          **(*gro_receive)(struct sk_buff **head,
1535                                               struct sk_buff *skb);
1536        int                     (*gro_complete)(struct sk_buff *skb);
1537};
1538
1539struct packet_offload {
1540        __be16                   type;  /* This is really htons(ether_type). */
1541        struct offload_callbacks callbacks;
1542        struct list_head         list;
1543};
1544
1545#include <linux/notifier.h>
1546
1547/* netdevice notifier chain. Please remember to update the rtnetlink
1548 * notification exclusion list in rtnetlink_event() when adding new
1549 * types.
1550 */
1551#define NETDEV_UP       0x0001  /* For now you can't veto a device up/down */
1552#define NETDEV_DOWN     0x0002
1553#define NETDEV_REBOOT   0x0003  /* Tell a protocol stack a network interface
1554                                   detected a hardware crash and restarted
1555                                   - we can use this eg to kick tcp sessions
1556                                   once done */
1557#define NETDEV_CHANGE   0x0004  /* Notify device state change */
1558#define NETDEV_REGISTER 0x0005
1559#define NETDEV_UNREGISTER       0x0006
1560#define NETDEV_CHANGEMTU        0x0007
1561#define NETDEV_CHANGEADDR       0x0008
1562#define NETDEV_GOING_DOWN       0x0009
1563#define NETDEV_CHANGENAME       0x000A
1564#define NETDEV_FEAT_CHANGE      0x000B
1565#define NETDEV_BONDING_FAILOVER 0x000C
1566#define NETDEV_PRE_UP           0x000D
1567#define NETDEV_PRE_TYPE_CHANGE  0x000E
1568#define NETDEV_POST_TYPE_CHANGE 0x000F
1569#define NETDEV_POST_INIT        0x0010
1570#define NETDEV_UNREGISTER_FINAL 0x0011
1571#define NETDEV_RELEASE          0x0012
1572#define NETDEV_NOTIFY_PEERS     0x0013
1573#define NETDEV_JOIN             0x0014
1574
1575extern int register_netdevice_notifier(struct notifier_block *nb);
1576extern int unregister_netdevice_notifier(struct notifier_block *nb);
1577extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1578
1579
1580extern rwlock_t                         dev_base_lock;          /* Device list lock */
1581
1582extern seqcount_t       devnet_rename_seq;      /* Device rename seq */
1583
1584
1585#define for_each_netdev(net, d)         \
1586                list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1587#define for_each_netdev_reverse(net, d) \
1588                list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
1589#define for_each_netdev_rcu(net, d)             \
1590                list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
1591#define for_each_netdev_safe(net, d, n) \
1592                list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
1593#define for_each_netdev_continue(net, d)                \
1594                list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
1595#define for_each_netdev_continue_rcu(net, d)            \
1596        list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
1597#define net_device_entry(lh)    list_entry(lh, struct net_device, dev_list)
1598
1599static inline struct net_device *next_net_device(struct net_device *dev)
1600{
1601        struct list_head *lh;
1602        struct net *net;
1603
1604        net = dev_net(dev);
1605        lh = dev->dev_list.next;
1606        return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1607}
1608
1609static inline struct net_device *next_net_device_rcu(struct net_device *dev)
1610{
1611        struct list_head *lh;
1612        struct net *net;
1613
1614        net = dev_net(dev);
1615        lh = rcu_dereference(list_next_rcu(&dev->dev_list));
1616        return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1617}
1618
1619static inline struct net_device *first_net_device(struct net *net)
1620{
1621        return list_empty(&net->dev_base_head) ? NULL :
1622                net_device_entry(net->dev_base_head.next);
1623}
1624
1625static inline struct net_device *first_net_device_rcu(struct net *net)
1626{
1627        struct list_head *lh = rcu_dereference(list_next_rcu(&net->dev_base_head));
1628
1629        return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1630}
1631
1632extern int                      netdev_boot_setup_check(struct net_device *dev);
1633extern unsigned long            netdev_boot_base(const char *prefix, int unit);
1634extern struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
1635                                              const char *hwaddr);
1636extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
1637extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
1638extern void             dev_add_pack(struct packet_type *pt);
1639extern void             dev_remove_pack(struct packet_type *pt);
1640extern void             __dev_remove_pack(struct packet_type *pt);
1641extern void             dev_add_offload(struct packet_offload *po);
1642extern void             dev_remove_offload(struct packet_offload *po);
1643extern void             __dev_remove_offload(struct packet_offload *po);
1644
1645extern struct net_device        *dev_get_by_flags_rcu(struct net *net, unsigned short flags,
1646                                                      unsigned short mask);
1647extern struct net_device        *dev_get_by_name(struct net *net, const char *name);
1648extern struct net_device        *dev_get_by_name_rcu(struct net *net, const char *name);
1649extern struct net_device        *__dev_get_by_name(struct net *net, const char *name);
1650extern int              dev_alloc_name(struct net_device *dev, const char *name);
1651extern int              dev_open(struct net_device *dev);
1652extern int              dev_close(struct net_device *dev);
1653extern void             dev_disable_lro(struct net_device *dev);
1654extern int              dev_loopback_xmit(struct sk_buff *newskb);
1655extern int              dev_queue_xmit(struct sk_buff *skb);
1656extern int              register_netdevice(struct net_device *dev);
1657extern void             unregister_netdevice_queue(struct net_device *dev,
1658                                                   struct list_head *head);
1659extern void             unregister_netdevice_many(struct list_head *head);
1660static inline void unregister_netdevice(struct net_device *dev)
1661{
1662        unregister_netdevice_queue(dev, NULL);
1663}
1664
1665extern int              netdev_refcnt_read(const struct net_device *dev);
1666extern void             free_netdev(struct net_device *dev);
1667extern void             synchronize_net(void);
1668extern int              init_dummy_netdev(struct net_device *dev);
1669extern void             netdev_resync_ops(struct net_device *dev);
1670
1671extern struct net_device        *dev_get_by_index(struct net *net, int ifindex);
1672extern struct net_device        *__dev_get_by_index(struct net *net, int ifindex);
1673extern struct net_device        *dev_get_by_index_rcu(struct net *net, int ifindex);
1674extern int              dev_restart(struct net_device *dev);
1675#ifdef CONFIG_NETPOLL_TRAP
1676extern int              netpoll_trap(void);
1677#endif
1678extern int             skb_gro_receive(struct sk_buff **head,
1679                                       struct sk_buff *skb);
1680
1681static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
1682{
1683        return NAPI_GRO_CB(skb)->data_offset;
1684}
1685
1686static inline unsigned int skb_gro_len(const struct sk_buff *skb)
1687{
1688        return skb->len - NAPI_GRO_CB(skb)->data_offset;
1689}
1690
1691static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
1692{
1693        NAPI_GRO_CB(skb)->data_offset += len;
1694}
1695
1696static inline void *skb_gro_header_fast(struct sk_buff *skb,
1697                                        unsigned int offset)
1698{
1699        return NAPI_GRO_CB(skb)->frag0 + offset;
1700}
1701
1702static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
1703{
1704        return NAPI_GRO_CB(skb)->frag0_len < hlen;
1705}
1706
1707static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
1708                                        unsigned int offset)
1709{
1710        if (!pskb_may_pull(skb, hlen))
1711                return NULL;
1712
1713        NAPI_GRO_CB(skb)->frag0 = NULL;
1714        NAPI_GRO_CB(skb)->frag0_len = 0;
1715        return skb->data + offset;
1716}
1717
1718static inline void *skb_gro_mac_header(struct sk_buff *skb)
1719{
1720        return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1721}
1722
1723static inline void *skb_gro_network_header(struct sk_buff *skb)
1724{
1725        return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
1726               skb_network_offset(skb);
1727}
1728
1729static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
1730                                  unsigned short type,
1731                                  const void *daddr, const void *saddr,
1732                                  unsigned int len)
1733{
1734        if (!dev->header_ops || !dev->header_ops->create)
1735                return 0;
1736
1737        return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1738}
1739
1740static inline int dev_parse_header(const struct sk_buff *skb,
1741                                   unsigned char *haddr)
1742{
1743        const struct net_device *dev = skb->dev;
1744
1745        if (!dev->header_ops || !dev->header_ops->parse)
1746                return 0;
1747        return dev->header_ops->parse(skb, haddr);
1748}
1749
1750typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
1751extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
1752static inline int unregister_gifconf(unsigned int family)
1753{
1754        return register_gifconf(family, NULL);
1755}
1756
1757/*
1758 * Incoming packets are placed on per-cpu queues
1759 */
1760struct softnet_data {
1761        struct Qdisc            *output_queue;
1762        struct Qdisc            **output_queue_tailp;
1763        struct list_head        poll_list;
1764        struct sk_buff          *completion_queue;
1765        struct sk_buff_head     process_queue;
1766
1767        /* stats */
1768        unsigned int            processed;
1769        unsigned int            time_squeeze;
1770        unsigned int            cpu_collision;
1771        unsigned int            received_rps;
1772
1773#ifdef CONFIG_RPS
1774        struct softnet_data     *rps_ipi_list;
1775
1776        /* Elements below can be accessed between CPUs for RPS */
1777        struct call_single_data csd ____cacheline_aligned_in_smp;
1778        struct softnet_data     *rps_ipi_next;
1779        unsigned int            cpu;
1780        unsigned int            input_queue_head;
1781        unsigned int            input_queue_tail;
1782#endif
1783        unsigned int            dropped;
1784        struct sk_buff_head     input_pkt_queue;
1785        struct napi_struct      backlog;
1786};
1787
1788static inline void input_queue_head_incr(struct softnet_data *sd)
1789{
1790#ifdef CONFIG_RPS
1791        sd->input_queue_head++;
1792#endif
1793}
1794
1795static inline void input_queue_tail_incr_save(struct softnet_data *sd,
1796                                              unsigned int *qtail)
1797{
1798#ifdef CONFIG_RPS
1799        *qtail = ++sd->input_queue_tail;
1800#endif
1801}
1802
1803DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
1804
1805extern void __netif_schedule(struct Qdisc *q);
1806
1807static inline void netif_schedule_queue(struct netdev_queue *txq)
1808{
1809        if (!(txq->state & QUEUE_STATE_ANY_XOFF))
1810                __netif_schedule(txq->qdisc);
1811}
1812
1813static inline void netif_tx_schedule_all(struct net_device *dev)
1814{
1815        unsigned int i;
1816
1817        for (i = 0; i < dev->num_tx_queues; i++)
1818                netif_schedule_queue(netdev_get_tx_queue(dev, i));
1819}
1820
1821static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
1822{
1823        clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1824}
1825
1826/**
1827 *      netif_start_queue - allow transmit
1828 *      @dev: network device
1829 *
1830 *      Allow upper layers to call the device hard_start_xmit routine.
1831 */
1832static inline void netif_start_queue(struct net_device *dev)
1833{
1834        netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
1835}
1836
1837static inline void netif_tx_start_all_queues(struct net_device *dev)
1838{
1839        unsigned int i;
1840
1841        for (i = 0; i < dev->num_tx_queues; i++) {
1842                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1843                netif_tx_start_queue(txq);
1844        }
1845}
1846
1847static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
1848{
1849#ifdef CONFIG_NETPOLL_TRAP
1850        if (netpoll_trap()) {
1851                netif_tx_start_queue(dev_queue);
1852                return;
1853        }
1854#endif
1855        if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state))
1856                __netif_schedule(dev_queue->qdisc);
1857}
1858
1859/**
1860 *      netif_wake_queue - restart transmit
1861 *      @dev: network device
1862 *
1863 *      Allow upper layers to call the device hard_start_xmit routine.
1864 *      Used for flow control when transmit resources are available.
1865 */
1866static inline void netif_wake_queue(struct net_device *dev)
1867{
1868        netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
1869}
1870
1871static inline void netif_tx_wake_all_queues(struct net_device *dev)
1872{
1873        unsigned int i;
1874
1875        for (i = 0; i < dev->num_tx_queues; i++) {
1876                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1877                netif_tx_wake_queue(txq);
1878        }
1879}
1880
1881static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
1882{
1883        if (WARN_ON(!dev_queue)) {
1884                pr_info("netif_stop_queue() cannot be called before register_netdev()\n");
1885                return;
1886        }
1887        set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1888}
1889
1890/**
1891 *      netif_stop_queue - stop transmitted packets
1892 *      @dev: network device
1893 *
1894 *      Stop upper layers calling the device hard_start_xmit routine.
1895 *      Used for flow control when transmit resources are unavailable.
1896 */
1897static inline void netif_stop_queue(struct net_device *dev)
1898{
1899        netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
1900}
1901
1902static inline void netif_tx_stop_all_queues(struct net_device *dev)
1903{
1904        unsigned int i;
1905
1906        for (i = 0; i < dev->num_tx_queues; i++) {
1907                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1908                netif_tx_stop_queue(txq);
1909        }
1910}
1911
1912static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
1913{
1914        return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1915}
1916
1917/**
1918 *      netif_queue_stopped - test if transmit queue is flowblocked
1919 *      @dev: network device
1920 *
1921 *      Test if transmit queue on device is currently unable to send.
1922 */
1923static inline bool netif_queue_stopped(const struct net_device *dev)
1924{
1925        return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
1926}
1927
1928static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue)
1929{
1930        return dev_queue->state & QUEUE_STATE_ANY_XOFF;
1931}
1932
1933static inline bool netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
1934{
1935        return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
1936}
1937
1938static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
1939                                        unsigned int bytes)
1940{
1941#ifdef CONFIG_BQL
1942        dql_queued(&dev_queue->dql, bytes);
1943
1944        if (likely(dql_avail(&dev_queue->dql) >= 0))
1945                return;
1946
1947        set_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
1948
1949        /*
1950         * The XOFF flag must be set before checking the dql_avail below,
1951         * because in netdev_tx_completed_queue we update the dql_completed
1952         * before checking the XOFF flag.
1953         */
1954        smp_mb();
1955
1956        /* check again in case another CPU has just made room avail */
1957        if (unlikely(dql_avail(&dev_queue->dql) >= 0))
1958                clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
1959#endif
1960}
1961
1962static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes)
1963{
1964        netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes);
1965}
1966
1967static inline void netdev_tx_completed_queue(struct netdev_queue *dev_queue,
1968                                             unsigned int pkts, unsigned int bytes)
1969{
1970#ifdef CONFIG_BQL
1971        if (unlikely(!bytes))
1972                return;
1973
1974        dql_completed(&dev_queue->dql, bytes);
1975
1976        /*
1977         * Without the memory barrier there is a small possiblity that
1978         * netdev_tx_sent_queue will miss the update and cause the queue to
1979         * be stopped forever
1980         */
1981        smp_mb();
1982
1983        if (dql_avail(&dev_queue->dql) < 0)
1984                return;
1985
1986        if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state))
1987                netif_schedule_queue(dev_queue);
1988#endif
1989}
1990
1991static inline void netdev_completed_queue(struct net_device *dev,
1992                                          unsigned int pkts, unsigned int bytes)
1993{
1994        netdev_tx_completed_queue(netdev_get_tx_queue(dev, 0), pkts, bytes);
1995}
1996
1997static inline void netdev_tx_reset_queue(struct netdev_queue *q)
1998{
1999#ifdef CONFIG_BQL
2000        clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state);
2001        dql_reset(&q->dql);
2002#endif
2003}
2004
2005static inline void netdev_reset_queue(struct net_device *dev_queue)
2006{
2007        netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
2008}
2009
2010/**
2011 *      netif_running - test if up
2012 *      @dev: network device
2013 *
2014 *      Test if the device has been brought up.
2015 */
2016static inline bool netif_running(const struct net_device *dev)
2017{
2018        return test_bit(__LINK_STATE_START, &dev->state);
2019}
2020
2021/*
2022 * Routines to manage the subqueues on a device.  We only need start
2023 * stop, and a check if it's stopped.  All other device management is
2024 * done at the overall netdevice level.
2025 * Also test the device if we're multiqueue.
2026 */
2027
2028/**
2029 *      netif_start_subqueue - allow sending packets on subqueue
2030 *      @dev: network device
2031 *      @queue_index: sub queue index
2032 *
2033 * Start individual transmit queue of a device with multiple transmit queues.
2034 */
2035static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
2036{
2037        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2038
2039        netif_tx_start_queue(txq);
2040}
2041
2042/**
2043 *      netif_stop_subqueue - stop sending packets on subqueue
2044 *      @dev: network device
2045 *      @queue_index: sub queue index
2046 *
2047 * Stop individual transmit queue of a device with multiple transmit queues.
2048 */
2049static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
2050{
2051        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2052#ifdef CONFIG_NETPOLL_TRAP
2053        if (netpoll_trap())
2054                return;
2055#endif
2056        netif_tx_stop_queue(txq);
2057}
2058
2059/**
2060 *      netif_subqueue_stopped - test status of subqueue
2061 *      @dev: network device
2062 *      @queue_index: sub queue index
2063 *
2064 * Check individual transmit queue of a device with multiple transmit queues.
2065 */
2066static inline bool __netif_subqueue_stopped(const struct net_device *dev,
2067                                            u16 queue_index)
2068{
2069        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2070
2071        return netif_tx_queue_stopped(txq);
2072}
2073
2074static inline bool netif_subqueue_stopped(const struct net_device *dev,
2075                                          struct sk_buff *skb)
2076{
2077        return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
2078}
2079
2080/**
2081 *      netif_wake_subqueue - allow sending packets on subqueue
2082 *      @dev: network device
2083 *      @queue_index: sub queue index
2084 *
2085 * Resume individual transmit queue of a device with multiple transmit queues.
2086 */
2087static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
2088{
2089        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2090#ifdef CONFIG_NETPOLL_TRAP
2091        if (netpoll_trap())
2092                return;
2093#endif
2094        if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &txq->state))
2095                __netif_schedule(txq->qdisc);
2096}
2097
2098/*
2099 * Returns a Tx hash for the given packet when dev->real_num_tx_queues is used
2100 * as a distribution range limit for the returned value.
2101 */
2102static inline u16 skb_tx_hash(const struct net_device *dev,
2103                              const struct sk_buff *skb)
2104{
2105        return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
2106}
2107
2108/**
2109 *      netif_is_multiqueue - test if device has multiple transmit queues
2110 *      @dev: network device
2111 *
2112 * Check if device has multiple transmit queues
2113 */
2114static inline bool netif_is_multiqueue(const struct net_device *dev)
2115{
2116        return dev->num_tx_queues > 1;
2117}
2118
2119extern int netif_set_real_num_tx_queues(struct net_device *dev,
2120                                        unsigned int txq);
2121
2122#ifdef CONFIG_RPS
2123extern int netif_set_real_num_rx_queues(struct net_device *dev,
2124                                        unsigned int rxq);
2125#else
2126static inline int netif_set_real_num_rx_queues(struct net_device *dev,
2127                                                unsigned int rxq)
2128{
2129        return 0;
2130}
2131#endif
2132
2133static inline int netif_copy_real_num_queues(struct net_device *to_dev,
2134                                             const struct net_device *from_dev)
2135{
2136        int err;
2137
2138        err = netif_set_real_num_tx_queues(to_dev,
2139                                           from_dev->real_num_tx_queues);
2140        if (err)
2141                return err;
2142#ifdef CONFIG_RPS
2143        return netif_set_real_num_rx_queues(to_dev,
2144                                            from_dev->real_num_rx_queues);
2145#else
2146        return 0;
2147#endif
2148}
2149
2150#define DEFAULT_MAX_NUM_RSS_QUEUES      (8)
2151extern int netif_get_num_default_rss_queues(void);
2152
2153/* Use this variant when it is known for sure that it
2154 * is executing from hardware interrupt context or with hardware interrupts
2155 * disabled.
2156 */
2157extern void dev_kfree_skb_irq(struct sk_buff *skb);
2158
2159/* Use this variant in places where it could be invoked
2160 * from either hardware interrupt or other context, with hardware interrupts
2161 * either disabled or enabled.
2162 */
2163extern void dev_kfree_skb_any(struct sk_buff *skb);
2164
2165extern int              netif_rx(struct sk_buff *skb);
2166extern int              netif_rx_ni(struct sk_buff *skb);
2167extern int              netif_receive_skb(struct sk_buff *skb);
2168extern gro_result_t     napi_gro_receive(struct napi_struct *napi,
2169                                         struct sk_buff *skb);
2170extern void             napi_gro_flush(struct napi_struct *napi, bool flush_old);
2171extern struct sk_buff * napi_get_frags(struct napi_struct *napi);
2172extern gro_result_t     napi_gro_frags(struct napi_struct *napi);
2173
2174static inline void napi_free_frags(struct napi_struct *napi)
2175{
2176        kfree_skb(napi->skb);
2177        napi->skb = NULL;
2178}
2179
2180extern int netdev_rx_handler_register(struct net_device *dev,
2181                                      rx_handler_func_t *rx_handler,
2182                                      void *rx_handler_data);
2183extern void netdev_rx_handler_unregister(struct net_device *dev);
2184
2185extern bool             dev_valid_name(const char *name);
2186extern int              dev_ioctl(struct net *net, unsigned int cmd, void __user *);
2187extern int              dev_ethtool(struct net *net, struct ifreq *);
2188extern unsigned int     dev_get_flags(const struct net_device *);
2189extern int              __dev_change_flags(struct net_device *, unsigned int flags);
2190extern int              dev_change_flags(struct net_device *, unsigned int);
2191extern void             __dev_notify_flags(struct net_device *, unsigned int old_flags);
2192extern int              dev_change_name(struct net_device *, const char *);
2193extern int              dev_set_alias(struct net_device *, const char *, size_t);
2194extern int              dev_change_net_namespace(struct net_device *,
2195                                                 struct net *, const char *);
2196extern int              dev_set_mtu(struct net_device *, int);
2197extern void             dev_set_group(struct net_device *, int);
2198extern int              dev_set_mac_address(struct net_device *,
2199                                            struct sockaddr *);
2200extern int              dev_hard_start_xmit(struct sk_buff *skb,
2201                                            struct net_device *dev,
2202                                            struct netdev_queue *txq);
2203extern int              dev_forward_skb(struct net_device *dev,
2204                                        struct sk_buff *skb);
2205
2206extern int              netdev_budget;
2207
2208/* Called by rtnetlink.c:rtnl_unlock() */
2209extern void netdev_run_todo(void);
2210
2211/**
2212 *      dev_put - release reference to device
2213 *      @dev: network device
2214 *
2215 * Release reference to device to allow it to be freed.
2216 */
2217static inline void dev_put(struct net_device *dev)
2218{
2219        this_cpu_dec(*dev->pcpu_refcnt);
2220}
2221
2222/**
2223 *      dev_hold - get reference to device
2224 *      @dev: network device
2225 *
2226 * Hold reference to device to keep it from being freed.
2227 */
2228static inline void dev_hold(struct net_device *dev)
2229{
2230        this_cpu_inc(*dev->pcpu_refcnt);
2231}
2232
2233/* Carrier loss detection, dial on demand. The functions netif_carrier_on
2234 * and _off may be called from IRQ context, but it is caller
2235 * who is responsible for serialization of these calls.
2236 *
2237 * The name carrier is inappropriate, these functions should really be
2238 * called netif_lowerlayer_*() because they represent the state of any
2239 * kind of lower layer not just hardware media.
2240 */
2241
2242extern void linkwatch_init_dev(struct net_device *dev);
2243extern void linkwatch_fire_event(struct net_device *dev);
2244extern void linkwatch_forget_dev(struct net_device *dev);
2245
2246/**
2247 *      netif_carrier_ok - test if carrier present
2248 *      @dev: network device
2249 *
2250 * Check if carrier is present on device
2251 */
2252static inline bool netif_carrier_ok(const struct net_device *dev)
2253{
2254        return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
2255}
2256
2257extern unsigned long dev_trans_start(struct net_device *dev);
2258
2259extern void __netdev_watchdog_up(struct net_device *dev);
2260
2261extern void netif_carrier_on(struct net_device *dev);
2262
2263extern void netif_carrier_off(struct net_device *dev);
2264
2265/**
2266 *      netif_dormant_on - mark device as dormant.
2267 *      @dev: network device
2268 *
2269 * Mark device as dormant (as per RFC2863).
2270 *
2271 * The dormant state indicates that the relevant interface is not
2272 * actually in a condition to pass packets (i.e., it is not 'up') but is
2273 * in a "pending" state, waiting for some external event.  For "on-
2274 * demand" interfaces, this new state identifies the situation where the
2275 * interface is waiting for events to place it in the up state.
2276 *
2277 */
2278static inline void netif_dormant_on(struct net_device *dev)
2279{
2280        if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
2281                linkwatch_fire_event(dev);
2282}
2283
2284/**
2285 *      netif_dormant_off - set device as not dormant.
2286 *      @dev: network device
2287 *
2288 * Device is not in dormant state.
2289 */
2290static inline void netif_dormant_off(struct net_device *dev)
2291{
2292        if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
2293                linkwatch_fire_event(dev);
2294}
2295
2296/**
2297 *      netif_dormant - test if carrier present
2298 *      @dev: network device
2299 *
2300 * Check if carrier is present on device
2301 */
2302static inline bool netif_dormant(const struct net_device *dev)
2303{
2304        return test_bit(__LINK_STATE_DORMANT, &dev->state);
2305}
2306
2307
2308/**
2309 *      netif_oper_up - test if device is operational
2310 *      @dev: network device
2311 *
2312 * Check if carrier is operational
2313 */
2314static inline bool netif_oper_up(const struct net_device *dev)
2315{
2316        return (dev->operstate == IF_OPER_UP ||
2317                dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
2318}
2319
2320/**
2321 *      netif_device_present - is device available or removed
2322 *      @dev: network device
2323 *
2324 * Check if device has not been removed from system.
2325 */
2326static inline bool netif_device_present(struct net_device *dev)
2327{
2328        return test_bit(__LINK_STATE_PRESENT, &dev->state);
2329}
2330
2331extern void netif_device_detach(struct net_device *dev);
2332
2333extern void netif_device_attach(struct net_device *dev);
2334
2335/*
2336 * Network interface message level settings
2337 */
2338
2339enum {
2340        NETIF_MSG_DRV           = 0x0001,
2341        NETIF_MSG_PROBE         = 0x0002,
2342        NETIF_MSG_LINK          = 0x0004,
2343        NETIF_MSG_TIMER         = 0x0008,
2344        NETIF_MSG_IFDOWN        = 0x0010,
2345        NETIF_MSG_IFUP          = 0x0020,
2346        NETIF_MSG_RX_ERR        = 0x0040,
2347        NETIF_MSG_TX_ERR        = 0x0080,
2348        NETIF_MSG_TX_QUEUED     = 0x0100,
2349        NETIF_MSG_INTR          = 0x0200,
2350        NETIF_MSG_TX_DONE       = 0x0400,
2351        NETIF_MSG_RX_STATUS     = 0x0800,
2352        NETIF_MSG_PKTDATA       = 0x1000,
2353        NETIF_MSG_HW            = 0x2000,
2354        NETIF_MSG_WOL           = 0x4000,
2355};
2356
2357#define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
2358#define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
2359#define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
2360#define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
2361#define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
2362#define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
2363#define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
2364#define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
2365#define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
2366#define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
2367#define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
2368#define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
2369#define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
2370#define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
2371#define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
2372
2373static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
2374{
2375        /* use default */
2376        if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
2377                return default_msg_enable_bits;
2378        if (debug_value == 0)   /* no output */
2379                return 0;
2380        /* set low N bits */
2381        return (1 << debug_value) - 1;
2382}
2383
2384static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
2385{
2386        spin_lock(&txq->_xmit_lock);
2387        txq->xmit_lock_owner = cpu;
2388}
2389
2390static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
2391{
2392        spin_lock_bh(&txq->_xmit_lock);
2393        txq->xmit_lock_owner = smp_processor_id();
2394}
2395
2396static inline bool __netif_tx_trylock(struct netdev_queue *txq)
2397{
2398        bool ok = spin_trylock(&txq->_xmit_lock);
2399        if (likely(ok))
2400                txq->xmit_lock_owner = smp_processor_id();
2401        return ok;
2402}
2403
2404static inline void __netif_tx_unlock(struct netdev_queue *txq)
2405{
2406        txq->xmit_lock_owner = -1;
2407        spin_unlock(&txq->_xmit_lock);
2408}
2409
2410static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
2411{
2412        txq->xmit_lock_owner = -1;
2413        spin_unlock_bh(&txq->_xmit_lock);
2414}
2415
2416static inline void txq_trans_update(struct netdev_queue *txq)
2417{
2418        if (txq->xmit_lock_owner != -1)
2419                txq->trans_start = jiffies;
2420}
2421
2422/**
2423 *      netif_tx_lock - grab network device transmit lock
2424 *      @dev: network device
2425 *
2426 * Get network device transmit lock
2427 */
2428static inline void netif_tx_lock(struct net_device *dev)
2429{
2430        unsigned int i;
2431        int cpu;
2432
2433        spin_lock(&dev->tx_global_lock);
2434        cpu = smp_processor_id();
2435        for (i = 0; i < dev->num_tx_queues; i++) {
2436                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2437
2438                /* We are the only thread of execution doing a
2439                 * freeze, but we have to grab the _xmit_lock in
2440                 * order to synchronize with threads which are in
2441                 * the ->hard_start_xmit() handler and already
2442                 * checked the frozen bit.
2443                 */
2444                __netif_tx_lock(txq, cpu);
2445                set_bit(__QUEUE_STATE_FROZEN, &txq->state);
2446                __netif_tx_unlock(txq);
2447        }
2448}
2449
2450static inline void netif_tx_lock_bh(struct net_device *dev)
2451{
2452        local_bh_disable();
2453        netif_tx_lock(dev);
2454}
2455
2456static inline void netif_tx_unlock(struct net_device *dev)
2457{
2458        unsigned int i;
2459
2460        for (i = 0; i < dev->num_tx_queues; i++) {
2461                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2462
2463                /* No need to grab the _xmit_lock here.  If the
2464                 * queue is not stopped for another reason, we
2465                 * force a schedule.
2466                 */
2467                clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
2468                netif_schedule_queue(txq);
2469        }
2470        spin_unlock(&dev->tx_global_lock);
2471}
2472
2473static inline void netif_tx_unlock_bh(struct net_device *dev)
2474{
2475        netif_tx_unlock(dev);
2476        local_bh_enable();
2477}
2478
2479#define HARD_TX_LOCK(dev, txq, cpu) {                   \
2480        if ((dev->features & NETIF_F_LLTX) == 0) {      \
2481                __netif_tx_lock(txq, cpu);              \
2482        }                                               \
2483}
2484
2485#define HARD_TX_UNLOCK(dev, txq) {                      \
2486        if ((dev->features & NETIF_F_LLTX) == 0) {      \
2487                __netif_tx_unlock(txq);                 \
2488        }                                               \
2489}
2490
2491static inline void netif_tx_disable(struct net_device *dev)
2492{
2493        unsigned int i;
2494        int cpu;
2495
2496        local_bh_disable();
2497        cpu = smp_processor_id();
2498        for (i = 0; i < dev->num_tx_queues; i++) {
2499                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2500
2501                __netif_tx_lock(txq, cpu);
2502                netif_tx_stop_queue(txq);
2503                __netif_tx_unlock(txq);
2504        }
2505        local_bh_enable();
2506}
2507
2508static inline void netif_addr_lock(struct net_device *dev)
2509{
2510        spin_lock(&dev->addr_list_lock);
2511}
2512
2513static inline void netif_addr_lock_nested(struct net_device *dev)
2514{
2515        spin_lock_nested(&dev->addr_list_lock, SINGLE_DEPTH_NESTING);
2516}
2517
2518static inline void netif_addr_lock_bh(struct net_device *dev)
2519{
2520        spin_lock_bh(&dev->addr_list_lock);
2521}
2522
2523static inline void netif_addr_unlock(struct net_device *dev)
2524{
2525        spin_unlock(&dev->addr_list_lock);
2526}
2527
2528static inline void netif_addr_unlock_bh(struct net_device *dev)
2529{
2530        spin_unlock_bh(&dev->addr_list_lock);
2531}
2532
2533/*
2534 * dev_addrs walker. Should be used only for read access. Call with
2535 * rcu_read_lock held.
2536 */
2537#define for_each_dev_addr(dev, ha) \
2538                list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
2539
2540/* These functions live elsewhere (drivers/net/net_init.c, but related) */
2541
2542extern void             ether_setup(struct net_device *dev);
2543
2544/* Support for loadable net-drivers */
2545extern struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
2546                                       void (*setup)(struct net_device *),
2547                                       unsigned int txqs, unsigned int rxqs);
2548#define alloc_netdev(sizeof_priv, name, setup) \
2549        alloc_netdev_mqs(sizeof_priv, name, setup, 1, 1)
2550
2551#define alloc_netdev_mq(sizeof_priv, name, setup, count) \
2552        alloc_netdev_mqs(sizeof_priv, name, setup, count, count)
2553
2554extern int              register_netdev(struct net_device *dev);
2555extern void             unregister_netdev(struct net_device *dev);
2556
2557/* General hardware address lists handling functions */
2558extern int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
2559                                  struct netdev_hw_addr_list *from_list,
2560                                  int addr_len, unsigned char addr_type);
2561extern void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
2562                                   struct netdev_hw_addr_list *from_list,
2563                                   int addr_len, unsigned char addr_type);
2564extern int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
2565                          struct netdev_hw_addr_list *from_list,
2566                          int addr_len);
2567extern void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
2568                             struct netdev_hw_addr_list *from_list,
2569                             int addr_len);
2570extern void __hw_addr_flush(struct netdev_hw_addr_list *list);
2571extern void __hw_addr_init(struct netdev_hw_addr_list *list);
2572
2573/* Functions used for device addresses handling */
2574extern int dev_addr_add(struct net_device *dev, const unsigned char *addr,
2575                        unsigned char addr_type);
2576extern int dev_addr_del(struct net_device *dev, const unsigned char *addr,
2577                        unsigned char addr_type);
2578extern int dev_addr_add_multiple(struct net_device *to_dev,
2579                                 struct net_device *from_dev,
2580                                 unsigned char addr_type);
2581extern int dev_addr_del_multiple(struct net_device *to_dev,
2582                                 struct net_device *from_dev,
2583                                 unsigned char addr_type);
2584extern void dev_addr_flush(struct net_device *dev);
2585extern int dev_addr_init(struct net_device *dev);
2586
2587/* Functions used for unicast addresses handling */
2588extern int dev_uc_add(struct net_device *dev, const unsigned char *addr);
2589extern int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr);
2590extern int dev_uc_del(struct net_device *dev, const unsigned char *addr);
2591extern int dev_uc_sync(struct net_device *to, struct net_device *from);
2592extern void dev_uc_unsync(struct net_device *to, struct net_device *from);
2593extern void dev_uc_flush(struct net_device *dev);
2594extern void dev_uc_init(struct net_device *dev);
2595
2596/* Functions used for multicast addresses handling */
2597extern int dev_mc_add(struct net_device *dev, const unsigned char *addr);
2598extern int dev_mc_add_global(struct net_device *dev, const unsigned char *addr);
2599extern int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr);
2600extern int dev_mc_del(struct net_device *dev, const unsigned char *addr);
2601extern int dev_mc_del_global(struct net_device *dev, const unsigned char *addr);
2602extern int dev_mc_sync(struct net_device *to, struct net_device *from);
2603extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
2604extern void dev_mc_flush(struct net_device *dev);
2605extern void dev_mc_init(struct net_device *dev);
2606
2607/* Functions used for secondary unicast and multicast support */
2608extern void             dev_set_rx_mode(struct net_device *dev);
2609extern void             __dev_set_rx_mode(struct net_device *dev);
2610extern int              dev_set_promiscuity(struct net_device *dev, int inc);
2611extern int              dev_set_allmulti(struct net_device *dev, int inc);
2612extern void             netdev_state_change(struct net_device *dev);
2613extern void             netdev_notify_peers(struct net_device *dev);
2614extern void             netdev_features_change(struct net_device *dev);
2615/* Load a device via the kmod */
2616extern void             dev_load(struct net *net, const char *name);
2617extern void             dev_mcast_init(void);
2618extern struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
2619                                               struct rtnl_link_stats64 *storage);
2620extern void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
2621                                    const struct net_device_stats *netdev_stats);
2622
2623extern int              netdev_max_backlog;
2624extern int              netdev_tstamp_prequeue;
2625extern int              weight_p;
2626extern int              bpf_jit_enable;
2627extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
2628extern int netdev_set_bond_master(struct net_device *dev,
2629                                  struct net_device *master);
2630extern int skb_checksum_help(struct sk_buff *skb);
2631extern struct sk_buff *skb_gso_segment(struct sk_buff *skb,
2632        netdev_features_t features);
2633#ifdef CONFIG_BUG
2634extern void netdev_rx_csum_fault(struct net_device *dev);
2635#else
2636static inline void netdev_rx_csum_fault(struct net_device *dev)
2637{
2638}
2639#endif
2640/* rx skb timestamps */
2641extern void             net_enable_timestamp(void);
2642extern void             net_disable_timestamp(void);
2643
2644#ifdef CONFIG_PROC_FS
2645extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
2646extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
2647extern void dev_seq_stop(struct seq_file *seq, void *v);
2648#endif
2649
2650extern int netdev_class_create_file(struct class_attribute *class_attr);
2651extern void netdev_class_remove_file(struct class_attribute *class_attr);
2652
2653extern struct kobj_ns_type_operations net_ns_type_operations;
2654
2655extern const char *netdev_drivername(const struct net_device *dev);
2656
2657extern void linkwatch_run_queue(void);
2658
2659static inline netdev_features_t netdev_get_wanted_features(
2660        struct net_device *dev)
2661{
2662        return (dev->features & ~dev->hw_features) | dev->wanted_features;
2663}
2664netdev_features_t netdev_increment_features(netdev_features_t all,
2665        netdev_features_t one, netdev_features_t mask);
2666int __netdev_update_features(struct net_device *dev);
2667void netdev_update_features(struct net_device *dev);
2668void netdev_change_features(struct net_device *dev);
2669
2670void netif_stacked_transfer_operstate(const struct net_device *rootdev,
2671                                        struct net_device *dev);
2672
2673netdev_features_t netif_skb_features(struct sk_buff *skb);
2674
2675static inline bool net_gso_ok(netdev_features_t features, int gso_type)
2676{
2677        netdev_features_t feature = gso_type << NETIF_F_GSO_SHIFT;
2678
2679        /* check flags correspondence */
2680        BUILD_BUG_ON(SKB_GSO_TCPV4   != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT));
2681        BUILD_BUG_ON(SKB_GSO_UDP     != (NETIF_F_UFO >> NETIF_F_GSO_SHIFT));
2682        BUILD_BUG_ON(SKB_GSO_DODGY   != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT));
2683        BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT));
2684        BUILD_BUG_ON(SKB_GSO_TCPV6   != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT));
2685        BUILD_BUG_ON(SKB_GSO_FCOE    != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT));
2686
2687        return (features & feature) == feature;
2688}
2689
2690static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
2691{
2692        return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
2693               (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
2694}
2695
2696static inline bool netif_needs_gso(struct sk_buff *skb,
2697                                   netdev_features_t features)
2698{
2699        return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
2700                unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
2701                         (skb->ip_summed != CHECKSUM_UNNECESSARY)));
2702}
2703
2704static inline void netif_set_gso_max_size(struct net_device *dev,
2705                                          unsigned int size)
2706{
2707        dev->gso_max_size = size;
2708}
2709
2710static inline bool netif_is_bond_slave(struct net_device *dev)
2711{
2712        return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
2713}
2714
2715static inline bool netif_supports_nofcs(struct net_device *dev)
2716{
2717        return dev->priv_flags & IFF_SUPP_NOFCS;
2718}
2719
2720extern struct pernet_operations __net_initdata loopback_net_ops;
2721
2722/* Logging, debugging and troubleshooting/diagnostic helpers. */
2723
2724/* netdev_printk helpers, similar to dev_printk */
2725
2726static inline const char *netdev_name(const struct net_device *dev)
2727{
2728        if (dev->reg_state != NETREG_REGISTERED)
2729                return "(unregistered net_device)";
2730        return dev->name;
2731}
2732
2733extern __printf(3, 4)
2734int netdev_printk(const char *level, const struct net_device *dev,
2735                  const char *format, ...);
2736extern __printf(2, 3)
2737int netdev_emerg(const struct net_device *dev, const char *format, ...);
2738extern __printf(2, 3)
2739int netdev_alert(const struct net_device *dev, const char *format, ...);
2740extern __printf(2, 3)
2741int netdev_crit(const struct net_device *dev, const char *format, ...);
2742extern __printf(2, 3)
2743int netdev_err(const struct net_device *dev, const char *format, ...);
2744extern __printf(2, 3)
2745int netdev_warn(const struct net_device *dev, const char *format, ...);
2746extern __printf(2, 3)
2747int netdev_notice(const struct net_device *dev, const char *format, ...);
2748extern __printf(2, 3)
2749int netdev_info(const struct net_device *dev, const char *format, ...);
2750
2751#define MODULE_ALIAS_NETDEV(device) \
2752        MODULE_ALIAS("netdev-" device)
2753
2754#if defined(CONFIG_DYNAMIC_DEBUG)
2755#define netdev_dbg(__dev, format, args...)                      \
2756do {                                                            \
2757        dynamic_netdev_dbg(__dev, format, ##args);              \
2758} while (0)
2759#elif defined(DEBUG)
2760#define netdev_dbg(__dev, format, args...)                      \
2761        netdev_printk(KERN_DEBUG, __dev, format, ##args)
2762#else
2763#define netdev_dbg(__dev, format, args...)                      \
2764({                                                              \
2765        if (0)                                                  \
2766                netdev_printk(KERN_DEBUG, __dev, format, ##args); \
2767        0;                                                      \
2768})
2769#endif
2770
2771#if defined(VERBOSE_DEBUG)
2772#define netdev_vdbg     netdev_dbg
2773#else
2774
2775#define netdev_vdbg(dev, format, args...)                       \
2776({                                                              \
2777        if (0)                                                  \
2778                netdev_printk(KERN_DEBUG, dev, format, ##args); \
2779        0;                                                      \
2780})
2781#endif
2782
2783/*
2784 * netdev_WARN() acts like dev_printk(), but with the key difference
2785 * of using a WARN/WARN_ON to get the message out, including the
2786 * file/line information and a backtrace.
2787 */
2788#define netdev_WARN(dev, format, args...)                       \
2789        WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args);
2790
2791/* netif printk helpers, similar to netdev_printk */
2792
2793#define netif_printk(priv, type, level, dev, fmt, args...)      \
2794do {                                                            \
2795        if (netif_msg_##type(priv))                             \
2796                netdev_printk(level, (dev), fmt, ##args);       \
2797} while (0)
2798
2799#define netif_level(level, priv, type, dev, fmt, args...)       \
2800do {                                                            \
2801        if (netif_msg_##type(priv))                             \
2802                netdev_##level(dev, fmt, ##args);               \
2803} while (0)
2804
2805#define netif_emerg(priv, type, dev, fmt, args...)              \
2806        netif_level(emerg, priv, type, dev, fmt, ##args)
2807#define netif_alert(priv, type, dev, fmt, args...)              \
2808        netif_level(alert, priv, type, dev, fmt, ##args)
2809#define netif_crit(priv, type, dev, fmt, args...)               \
2810        netif_level(crit, priv, type, dev, fmt, ##args)
2811#define netif_err(priv, type, dev, fmt, args...)                \
2812        netif_level(err, priv, type, dev, fmt, ##args)
2813#define netif_warn(priv, type, dev, fmt, args...)               \
2814        netif_level(warn, priv, type, dev, fmt, ##args)
2815#define netif_notice(priv, type, dev, fmt, args...)             \
2816        netif_level(notice, priv, type, dev, fmt, ##args)
2817#define netif_info(priv, type, dev, fmt, args...)               \
2818        netif_level(info, priv, type, dev, fmt, ##args)
2819
2820#if defined(CONFIG_DYNAMIC_DEBUG)
2821#define netif_dbg(priv, type, netdev, format, args...)          \
2822do {                                                            \
2823        if (netif_msg_##type(priv))                             \
2824                dynamic_netdev_dbg(netdev, format, ##args);     \
2825} while (0)
2826#elif defined(DEBUG)
2827#define netif_dbg(priv, type, dev, format, args...)             \
2828        netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
2829#else
2830#define netif_dbg(priv, type, dev, format, args...)                     \
2831({                                                                      \
2832        if (0)                                                          \
2833                netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2834        0;                                                              \
2835})
2836#endif
2837
2838#if defined(VERBOSE_DEBUG)
2839#define netif_vdbg      netif_dbg
2840#else
2841#define netif_vdbg(priv, type, dev, format, args...)            \
2842({                                                              \
2843        if (0)                                                  \
2844                netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2845        0;                                                      \
2846})
2847#endif
2848
2849#endif  /* _LINUX_NETDEVICE_H */
2850
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