linux/include/linux/netdevice.h
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   1/*
   2 * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3 *              operating system.  INET is implemented using the  BSD Socket
   4 *              interface as the means of communication with the user level.
   5 *
   6 *              Definitions for the Interfaces handler.
   7 *
   8 * Version:     @(#)dev.h       1.0.10  08/12/93
   9 *
  10 * Authors:     Ross Biro
  11 *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12 *              Corey Minyard <wf-rch!minyard@relay.EU.net>
  13 *              Donald J. Becker, <becker@cesdis.gsfc.nasa.gov>
  14 *              Alan Cox, <alan@lxorguk.ukuu.org.uk>
  15 *              Bjorn Ekwall. <bj0rn@blox.se>
  16 *              Pekka Riikonen <priikone@poseidon.pspt.fi>
  17 *
  18 *              This program is free software; you can redistribute it and/or
  19 *              modify it under the terms of the GNU General Public License
  20 *              as published by the Free Software Foundation; either version
  21 *              2 of the License, or (at your option) any later version.
  22 *
  23 *              Moved to /usr/include/linux for NET3
  24 */
  25#ifndef _LINUX_NETDEVICE_H
  26#define _LINUX_NETDEVICE_H
  27
  28#include <linux/if.h>
  29#include <linux/if_ether.h>
  30#include <linux/if_packet.h>
  31#include <linux/if_link.h>
  32
  33#ifdef __KERNEL__
  34#include <linux/pm_qos.h>
  35#include <linux/timer.h>
  36#include <linux/bug.h>
  37#include <linux/delay.h>
  38#include <linux/atomic.h>
  39#include <asm/cache.h>
  40#include <asm/byteorder.h>
  41
  42#include <linux/percpu.h>
  43#include <linux/rculist.h>
  44#include <linux/dmaengine.h>
  45#include <linux/workqueue.h>
  46#include <linux/dynamic_queue_limits.h>
  47
  48#include <linux/ethtool.h>
  49#include <net/net_namespace.h>
  50#include <net/dsa.h>
  51#ifdef CONFIG_DCB
  52#include <net/dcbnl.h>
  53#endif
  54#include <net/netprio_cgroup.h>
  55
  56#include <linux/netdev_features.h>
  57#include <linux/neighbour.h>
  58
  59struct netpoll_info;
  60struct device;
  61struct phy_device;
  62/* 802.11 specific */
  63struct wireless_dev;
  64                                        /* source back-compat hooks */
  65#define SET_ETHTOOL_OPS(netdev,ops) \
  66        ( (netdev)->ethtool_ops = (ops) )
  67
  68/* hardware address assignment types */
  69#define NET_ADDR_PERM           0       /* address is permanent (default) */
  70#define NET_ADDR_RANDOM         1       /* address is generated randomly */
  71#define NET_ADDR_STOLEN         2       /* address is stolen from other device */
  72
  73/* Backlog congestion levels */
  74#define NET_RX_SUCCESS          0       /* keep 'em coming, baby */
  75#define NET_RX_DROP             1       /* packet dropped */
  76
  77/*
  78 * Transmit return codes: transmit return codes originate from three different
  79 * namespaces:
  80 *
  81 * - qdisc return codes
  82 * - driver transmit return codes
  83 * - errno values
  84 *
  85 * Drivers are allowed to return any one of those in their hard_start_xmit()
  86 * function. Real network devices commonly used with qdiscs should only return
  87 * the driver transmit return codes though - when qdiscs are used, the actual
  88 * transmission happens asynchronously, so the value is not propagated to
  89 * higher layers. Virtual network devices transmit synchronously, in this case
  90 * the driver transmit return codes are consumed by dev_queue_xmit(), all
  91 * others are propagated to higher layers.
  92 */
  93
  94/* qdisc ->enqueue() return codes. */
  95#define NET_XMIT_SUCCESS        0x00
  96#define NET_XMIT_DROP           0x01    /* skb dropped                  */
  97#define NET_XMIT_CN             0x02    /* congestion notification      */
  98#define NET_XMIT_POLICED        0x03    /* skb is shot by police        */
  99#define NET_XMIT_MASK           0x0f    /* qdisc flags in net/sch_generic.h */
 100
 101/* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
 102 * indicates that the device will soon be dropping packets, or already drops
 103 * some packets of the same priority; prompting us to send less aggressively. */
 104#define net_xmit_eval(e)        ((e) == NET_XMIT_CN ? 0 : (e))
 105#define net_xmit_errno(e)       ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
 106
 107/* Driver transmit return codes */
 108#define NETDEV_TX_MASK          0xf0
 109
 110enum netdev_tx {
 111        __NETDEV_TX_MIN  = INT_MIN,     /* make sure enum is signed */
 112        NETDEV_TX_OK     = 0x00,        /* driver took care of packet */
 113        NETDEV_TX_BUSY   = 0x10,        /* driver tx path was busy*/
 114        NETDEV_TX_LOCKED = 0x20,        /* driver tx lock was already taken */
 115};
 116typedef enum netdev_tx netdev_tx_t;
 117
 118/*
 119 * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant;
 120 * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed.
 121 */
 122static inline bool dev_xmit_complete(int rc)
 123{
 124        /*
 125         * Positive cases with an skb consumed by a driver:
 126         * - successful transmission (rc == NETDEV_TX_OK)
 127         * - error while transmitting (rc < 0)
 128         * - error while queueing to a different device (rc & NET_XMIT_MASK)
 129         */
 130        if (likely(rc < NET_XMIT_MASK))
 131                return true;
 132
 133        return false;
 134}
 135
 136#endif
 137
 138#define MAX_ADDR_LEN    32              /* Largest hardware address length */
 139
 140/* Initial net device group. All devices belong to group 0 by default. */
 141#define INIT_NETDEV_GROUP       0
 142
 143#ifdef  __KERNEL__
 144/*
 145 *      Compute the worst case header length according to the protocols
 146 *      used.
 147 */
 148
 149#if defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
 150# if defined(CONFIG_MAC80211_MESH)
 151#  define LL_MAX_HEADER 128
 152# else
 153#  define LL_MAX_HEADER 96
 154# endif
 155#elif IS_ENABLED(CONFIG_TR)
 156# define LL_MAX_HEADER 48
 157#else
 158# define LL_MAX_HEADER 32
 159#endif
 160
 161#if !IS_ENABLED(CONFIG_NET_IPIP) && !IS_ENABLED(CONFIG_NET_IPGRE) && \
 162    !IS_ENABLED(CONFIG_IPV6_SIT) && !IS_ENABLED(CONFIG_IPV6_TUNNEL)
 163#define MAX_HEADER LL_MAX_HEADER
 164#else
 165#define MAX_HEADER (LL_MAX_HEADER + 48)
 166#endif
 167
 168/*
 169 *      Old network device statistics. Fields are native words
 170 *      (unsigned long) so they can be read and written atomically.
 171 */
 172
 173struct net_device_stats {
 174        unsigned long   rx_packets;
 175        unsigned long   tx_packets;
 176        unsigned long   rx_bytes;
 177        unsigned long   tx_bytes;
 178        unsigned long   rx_errors;
 179        unsigned long   tx_errors;
 180        unsigned long   rx_dropped;
 181        unsigned long   tx_dropped;
 182        unsigned long   multicast;
 183        unsigned long   collisions;
 184        unsigned long   rx_length_errors;
 185        unsigned long   rx_over_errors;
 186        unsigned long   rx_crc_errors;
 187        unsigned long   rx_frame_errors;
 188        unsigned long   rx_fifo_errors;
 189        unsigned long   rx_missed_errors;
 190        unsigned long   tx_aborted_errors;
 191        unsigned long   tx_carrier_errors;
 192        unsigned long   tx_fifo_errors;
 193        unsigned long   tx_heartbeat_errors;
 194        unsigned long   tx_window_errors;
 195        unsigned long   rx_compressed;
 196        unsigned long   tx_compressed;
 197};
 198
 199#endif  /*  __KERNEL__  */
 200
 201
 202/* Media selection options. */
 203enum {
 204        IF_PORT_UNKNOWN = 0,
 205        IF_PORT_10BASE2,
 206        IF_PORT_10BASET,
 207        IF_PORT_AUI,
 208        IF_PORT_100BASET,
 209        IF_PORT_100BASETX,
 210        IF_PORT_100BASEFX
 211};
 212
 213#ifdef __KERNEL__
 214
 215#include <linux/cache.h>
 216#include <linux/skbuff.h>
 217
 218#ifdef CONFIG_RPS
 219#include <linux/static_key.h>
 220extern struct static_key rps_needed;
 221#endif
 222
 223struct neighbour;
 224struct neigh_parms;
 225struct sk_buff;
 226
 227struct netdev_hw_addr {
 228        struct list_head        list;
 229        unsigned char           addr[MAX_ADDR_LEN];
 230        unsigned char           type;
 231#define NETDEV_HW_ADDR_T_LAN            1
 232#define NETDEV_HW_ADDR_T_SAN            2
 233#define NETDEV_HW_ADDR_T_SLAVE          3
 234#define NETDEV_HW_ADDR_T_UNICAST        4
 235#define NETDEV_HW_ADDR_T_MULTICAST      5
 236        bool                    synced;
 237        bool                    global_use;
 238        int                     refcount;
 239        struct rcu_head         rcu_head;
 240};
 241
 242struct netdev_hw_addr_list {
 243        struct list_head        list;
 244        int                     count;
 245};
 246
 247#define netdev_hw_addr_list_count(l) ((l)->count)
 248#define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0)
 249#define netdev_hw_addr_list_for_each(ha, l) \
 250        list_for_each_entry(ha, &(l)->list, list)
 251
 252#define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc)
 253#define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc)
 254#define netdev_for_each_uc_addr(ha, dev) \
 255        netdev_hw_addr_list_for_each(ha, &(dev)->uc)
 256
 257#define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc)
 258#define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc)
 259#define netdev_for_each_mc_addr(ha, dev) \
 260        netdev_hw_addr_list_for_each(ha, &(dev)->mc)
 261
 262struct hh_cache {
 263        u16             hh_len;
 264        u16             __pad;
 265        seqlock_t       hh_lock;
 266
 267        /* cached hardware header; allow for machine alignment needs.        */
 268#define HH_DATA_MOD     16
 269#define HH_DATA_OFF(__len) \
 270        (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
 271#define HH_DATA_ALIGN(__len) \
 272        (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
 273        unsigned long   hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
 274};
 275
 276/* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
 277 * Alternative is:
 278 *   dev->hard_header_len ? (dev->hard_header_len +
 279 *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
 280 *
 281 * We could use other alignment values, but we must maintain the
 282 * relationship HH alignment <= LL alignment.
 283 */
 284#define LL_RESERVED_SPACE(dev) \
 285        ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 286#define LL_RESERVED_SPACE_EXTRA(dev,extra) \
 287        ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 288
 289struct header_ops {
 290        int     (*create) (struct sk_buff *skb, struct net_device *dev,
 291                           unsigned short type, const void *daddr,
 292                           const void *saddr, unsigned int len);
 293        int     (*parse)(const struct sk_buff *skb, unsigned char *haddr);
 294        int     (*rebuild)(struct sk_buff *skb);
 295        int     (*cache)(const struct neighbour *neigh, struct hh_cache *hh, __be16 type);
 296        void    (*cache_update)(struct hh_cache *hh,
 297                                const struct net_device *dev,
 298                                const unsigned char *haddr);
 299};
 300
 301/* These flag bits are private to the generic network queueing
 302 * layer, they may not be explicitly referenced by any other
 303 * code.
 304 */
 305
 306enum netdev_state_t {
 307        __LINK_STATE_START,
 308        __LINK_STATE_PRESENT,
 309        __LINK_STATE_NOCARRIER,
 310        __LINK_STATE_LINKWATCH_PENDING,
 311        __LINK_STATE_DORMANT,
 312};
 313
 314
 315/*
 316 * This structure holds at boot time configured netdevice settings. They
 317 * are then used in the device probing.
 318 */
 319struct netdev_boot_setup {
 320        char name[IFNAMSIZ];
 321        struct ifmap map;
 322};
 323#define NETDEV_BOOT_SETUP_MAX 8
 324
 325extern int __init netdev_boot_setup(char *str);
 326
 327/*
 328 * Structure for NAPI scheduling similar to tasklet but with weighting
 329 */
 330struct napi_struct {
 331        /* The poll_list must only be managed by the entity which
 332         * changes the state of the NAPI_STATE_SCHED bit.  This means
 333         * whoever atomically sets that bit can add this napi_struct
 334         * to the per-cpu poll_list, and whoever clears that bit
 335         * can remove from the list right before clearing the bit.
 336         */
 337        struct list_head        poll_list;
 338
 339        unsigned long           state;
 340        int                     weight;
 341        int                     (*poll)(struct napi_struct *, int);
 342#ifdef CONFIG_NETPOLL
 343        spinlock_t              poll_lock;
 344        int                     poll_owner;
 345#endif
 346
 347        unsigned int            gro_count;
 348
 349        struct net_device       *dev;
 350        struct list_head        dev_list;
 351        struct sk_buff          *gro_list;
 352        struct sk_buff          *skb;
 353};
 354
 355enum {
 356        NAPI_STATE_SCHED,       /* Poll is scheduled */
 357        NAPI_STATE_DISABLE,     /* Disable pending */
 358        NAPI_STATE_NPSVC,       /* Netpoll - don't dequeue from poll_list */
 359};
 360
 361enum gro_result {
 362        GRO_MERGED,
 363        GRO_MERGED_FREE,
 364        GRO_HELD,
 365        GRO_NORMAL,
 366        GRO_DROP,
 367};
 368typedef enum gro_result gro_result_t;
 369
 370/*
 371 * enum rx_handler_result - Possible return values for rx_handlers.
 372 * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it
 373 * further.
 374 * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in
 375 * case skb->dev was changed by rx_handler.
 376 * @RX_HANDLER_EXACT: Force exact delivery, no wildcard.
 377 * @RX_HANDLER_PASS: Do nothing, passe the skb as if no rx_handler was called.
 378 *
 379 * rx_handlers are functions called from inside __netif_receive_skb(), to do
 380 * special processing of the skb, prior to delivery to protocol handlers.
 381 *
 382 * Currently, a net_device can only have a single rx_handler registered. Trying
 383 * to register a second rx_handler will return -EBUSY.
 384 *
 385 * To register a rx_handler on a net_device, use netdev_rx_handler_register().
 386 * To unregister a rx_handler on a net_device, use
 387 * netdev_rx_handler_unregister().
 388 *
 389 * Upon return, rx_handler is expected to tell __netif_receive_skb() what to
 390 * do with the skb.
 391 *
 392 * If the rx_handler consumed to skb in some way, it should return
 393 * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for
 394 * the skb to be delivered in some other ways.
 395 *
 396 * If the rx_handler changed skb->dev, to divert the skb to another
 397 * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the
 398 * new device will be called if it exists.
 399 *
 400 * If the rx_handler consider the skb should be ignored, it should return
 401 * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that
 402 * are registred on exact device (ptype->dev == skb->dev).
 403 *
 404 * If the rx_handler didn't changed skb->dev, but want the skb to be normally
 405 * delivered, it should return RX_HANDLER_PASS.
 406 *
 407 * A device without a registered rx_handler will behave as if rx_handler
 408 * returned RX_HANDLER_PASS.
 409 */
 410
 411enum rx_handler_result {
 412        RX_HANDLER_CONSUMED,
 413        RX_HANDLER_ANOTHER,
 414        RX_HANDLER_EXACT,
 415        RX_HANDLER_PASS,
 416};
 417typedef enum rx_handler_result rx_handler_result_t;
 418typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);
 419
 420extern void __napi_schedule(struct napi_struct *n);
 421
 422static inline bool napi_disable_pending(struct napi_struct *n)
 423{
 424        return test_bit(NAPI_STATE_DISABLE, &n->state);
 425}
 426
 427/**
 428 *      napi_schedule_prep - check if napi can be scheduled
 429 *      @n: napi context
 430 *
 431 * Test if NAPI routine is already running, and if not mark
 432 * it as running.  This is used as a condition variable
 433 * insure only one NAPI poll instance runs.  We also make
 434 * sure there is no pending NAPI disable.
 435 */
 436static inline bool napi_schedule_prep(struct napi_struct *n)
 437{
 438        return !napi_disable_pending(n) &&
 439                !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
 440}
 441
 442/**
 443 *      napi_schedule - schedule NAPI poll
 444 *      @n: napi context
 445 *
 446 * Schedule NAPI poll routine to be called if it is not already
 447 * running.
 448 */
 449static inline void napi_schedule(struct napi_struct *n)
 450{
 451        if (napi_schedule_prep(n))
 452                __napi_schedule(n);
 453}
 454
 455/* Try to reschedule poll. Called by dev->poll() after napi_complete().  */
 456static inline bool napi_reschedule(struct napi_struct *napi)
 457{
 458        if (napi_schedule_prep(napi)) {
 459                __napi_schedule(napi);
 460                return true;
 461        }
 462        return false;
 463}
 464
 465/**
 466 *      napi_complete - NAPI processing complete
 467 *      @n: napi context
 468 *
 469 * Mark NAPI processing as complete.
 470 */
 471extern void __napi_complete(struct napi_struct *n);
 472extern void napi_complete(struct napi_struct *n);
 473
 474/**
 475 *      napi_disable - prevent NAPI from scheduling
 476 *      @n: napi context
 477 *
 478 * Stop NAPI from being scheduled on this context.
 479 * Waits till any outstanding processing completes.
 480 */
 481static inline void napi_disable(struct napi_struct *n)
 482{
 483        set_bit(NAPI_STATE_DISABLE, &n->state);
 484        while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
 485                msleep(1);
 486        clear_bit(NAPI_STATE_DISABLE, &n->state);
 487}
 488
 489/**
 490 *      napi_enable - enable NAPI scheduling
 491 *      @n: napi context
 492 *
 493 * Resume NAPI from being scheduled on this context.
 494 * Must be paired with napi_disable.
 495 */
 496static inline void napi_enable(struct napi_struct *n)
 497{
 498        BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
 499        smp_mb__before_clear_bit();
 500        clear_bit(NAPI_STATE_SCHED, &n->state);
 501}
 502
 503#ifdef CONFIG_SMP
 504/**
 505 *      napi_synchronize - wait until NAPI is not running
 506 *      @n: napi context
 507 *
 508 * Wait until NAPI is done being scheduled on this context.
 509 * Waits till any outstanding processing completes but
 510 * does not disable future activations.
 511 */
 512static inline void napi_synchronize(const struct napi_struct *n)
 513{
 514        while (test_bit(NAPI_STATE_SCHED, &n->state))
 515                msleep(1);
 516}
 517#else
 518# define napi_synchronize(n)    barrier()
 519#endif
 520
 521enum netdev_queue_state_t {
 522        __QUEUE_STATE_DRV_XOFF,
 523        __QUEUE_STATE_STACK_XOFF,
 524        __QUEUE_STATE_FROZEN,
 525#define QUEUE_STATE_ANY_XOFF ((1 << __QUEUE_STATE_DRV_XOFF)             | \
 526                              (1 << __QUEUE_STATE_STACK_XOFF))
 527#define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF            | \
 528                                        (1 << __QUEUE_STATE_FROZEN))
 529};
 530/*
 531 * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue.  The
 532 * netif_tx_* functions below are used to manipulate this flag.  The
 533 * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit
 534 * queue independently.  The netif_xmit_*stopped functions below are called
 535 * to check if the queue has been stopped by the driver or stack (either
 536 * of the XOFF bits are set in the state).  Drivers should not need to call
 537 * netif_xmit*stopped functions, they should only be using netif_tx_*.
 538 */
 539
 540struct netdev_queue {
 541/*
 542 * read mostly part
 543 */
 544        struct net_device       *dev;
 545        struct Qdisc            *qdisc;
 546        struct Qdisc            *qdisc_sleeping;
 547#ifdef CONFIG_SYSFS
 548        struct kobject          kobj;
 549#endif
 550#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
 551        int                     numa_node;
 552#endif
 553/*
 554 * write mostly part
 555 */
 556        spinlock_t              _xmit_lock ____cacheline_aligned_in_smp;
 557        int                     xmit_lock_owner;
 558        /*
 559         * please use this field instead of dev->trans_start
 560         */
 561        unsigned long           trans_start;
 562
 563        /*
 564         * Number of TX timeouts for this queue
 565         * (/sys/class/net/DEV/Q/trans_timeout)
 566         */
 567        unsigned long           trans_timeout;
 568
 569        unsigned long           state;
 570
 571#ifdef CONFIG_BQL
 572        struct dql              dql;
 573#endif
 574} ____cacheline_aligned_in_smp;
 575
 576static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
 577{
 578#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
 579        return q->numa_node;
 580#else
 581        return NUMA_NO_NODE;
 582#endif
 583}
 584
 585static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node)
 586{
 587#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
 588        q->numa_node = node;
 589#endif
 590}
 591
 592#ifdef CONFIG_RPS
 593/*
 594 * This structure holds an RPS map which can be of variable length.  The
 595 * map is an array of CPUs.
 596 */
 597struct rps_map {
 598        unsigned int len;
 599        struct rcu_head rcu;
 600        u16 cpus[0];
 601};
 602#define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16)))
 603
 604/*
 605 * The rps_dev_flow structure contains the mapping of a flow to a CPU, the
 606 * tail pointer for that CPU's input queue at the time of last enqueue, and
 607 * a hardware filter index.
 608 */
 609struct rps_dev_flow {
 610        u16 cpu;
 611        u16 filter;
 612        unsigned int last_qtail;
 613};
 614#define RPS_NO_FILTER 0xffff
 615
 616/*
 617 * The rps_dev_flow_table structure contains a table of flow mappings.
 618 */
 619struct rps_dev_flow_table {
 620        unsigned int mask;
 621        struct rcu_head rcu;
 622        struct work_struct free_work;
 623        struct rps_dev_flow flows[0];
 624};
 625#define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
 626    ((_num) * sizeof(struct rps_dev_flow)))
 627
 628/*
 629 * The rps_sock_flow_table contains mappings of flows to the last CPU
 630 * on which they were processed by the application (set in recvmsg).
 631 */
 632struct rps_sock_flow_table {
 633        unsigned int mask;
 634        u16 ents[0];
 635};
 636#define RPS_SOCK_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_sock_flow_table) + \
 637    ((_num) * sizeof(u16)))
 638
 639#define RPS_NO_CPU 0xffff
 640
 641static inline void rps_record_sock_flow(struct rps_sock_flow_table *table,
 642                                        u32 hash)
 643{
 644        if (table && hash) {
 645                unsigned int cpu, index = hash & table->mask;
 646
 647                /* We only give a hint, preemption can change cpu under us */
 648                cpu = raw_smp_processor_id();
 649
 650                if (table->ents[index] != cpu)
 651                        table->ents[index] = cpu;
 652        }
 653}
 654
 655static inline void rps_reset_sock_flow(struct rps_sock_flow_table *table,
 656                                       u32 hash)
 657{
 658        if (table && hash)
 659                table->ents[hash & table->mask] = RPS_NO_CPU;
 660}
 661
 662extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;
 663
 664#ifdef CONFIG_RFS_ACCEL
 665extern bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
 666                                u32 flow_id, u16 filter_id);
 667#endif
 668
 669/* This structure contains an instance of an RX queue. */
 670struct netdev_rx_queue {
 671        struct rps_map __rcu            *rps_map;
 672        struct rps_dev_flow_table __rcu *rps_flow_table;
 673        struct kobject                  kobj;
 674        struct net_device               *dev;
 675} ____cacheline_aligned_in_smp;
 676#endif /* CONFIG_RPS */
 677
 678#ifdef CONFIG_XPS
 679/*
 680 * This structure holds an XPS map which can be of variable length.  The
 681 * map is an array of queues.
 682 */
 683struct xps_map {
 684        unsigned int len;
 685        unsigned int alloc_len;
 686        struct rcu_head rcu;
 687        u16 queues[0];
 688};
 689#define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16)))
 690#define XPS_MIN_MAP_ALLOC ((L1_CACHE_BYTES - sizeof(struct xps_map))    \
 691    / sizeof(u16))
 692
 693/*
 694 * This structure holds all XPS maps for device.  Maps are indexed by CPU.
 695 */
 696struct xps_dev_maps {
 697        struct rcu_head rcu;
 698        struct xps_map __rcu *cpu_map[0];
 699};
 700#define XPS_DEV_MAPS_SIZE (sizeof(struct xps_dev_maps) +                \
 701    (nr_cpu_ids * sizeof(struct xps_map *)))
 702#endif /* CONFIG_XPS */
 703
 704#define TC_MAX_QUEUE    16
 705#define TC_BITMASK      15
 706/* HW offloaded queuing disciplines txq count and offset maps */
 707struct netdev_tc_txq {
 708        u16 count;
 709        u16 offset;
 710};
 711
 712#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 713/*
 714 * This structure is to hold information about the device
 715 * configured to run FCoE protocol stack.
 716 */
 717struct netdev_fcoe_hbainfo {
 718        char    manufacturer[64];
 719        char    serial_number[64];
 720        char    hardware_version[64];
 721        char    driver_version[64];
 722        char    optionrom_version[64];
 723        char    firmware_version[64];
 724        char    model[256];
 725        char    model_description[256];
 726};
 727#endif
 728
 729/*
 730 * This structure defines the management hooks for network devices.
 731 * The following hooks can be defined; unless noted otherwise, they are
 732 * optional and can be filled with a null pointer.
 733 *
 734 * int (*ndo_init)(struct net_device *dev);
 735 *     This function is called once when network device is registered.
 736 *     The network device can use this to any late stage initializaton
 737 *     or semantic validattion. It can fail with an error code which will
 738 *     be propogated back to register_netdev
 739 *
 740 * void (*ndo_uninit)(struct net_device *dev);
 741 *     This function is called when device is unregistered or when registration
 742 *     fails. It is not called if init fails.
 743 *
 744 * int (*ndo_open)(struct net_device *dev);
 745 *     This function is called when network device transistions to the up
 746 *     state.
 747 *
 748 * int (*ndo_stop)(struct net_device *dev);
 749 *     This function is called when network device transistions to the down
 750 *     state.
 751 *
 752 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
 753 *                               struct net_device *dev);
 754 *      Called when a packet needs to be transmitted.
 755 *      Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
 756 *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
 757 *      Required can not be NULL.
 758 *
 759 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
 760 *      Called to decide which queue to when device supports multiple
 761 *      transmit queues.
 762 *
 763 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
 764 *      This function is called to allow device receiver to make
 765 *      changes to configuration when multicast or promiscious is enabled.
 766 *
 767 * void (*ndo_set_rx_mode)(struct net_device *dev);
 768 *      This function is called device changes address list filtering.
 769 *      If driver handles unicast address filtering, it should set
 770 *      IFF_UNICAST_FLT to its priv_flags.
 771 *
 772 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
 773 *      This function  is called when the Media Access Control address
 774 *      needs to be changed. If this interface is not defined, the
 775 *      mac address can not be changed.
 776 *
 777 * int (*ndo_validate_addr)(struct net_device *dev);
 778 *      Test if Media Access Control address is valid for the device.
 779 *
 780 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
 781 *      Called when a user request an ioctl which can't be handled by
 782 *      the generic interface code. If not defined ioctl's return
 783 *      not supported error code.
 784 *
 785 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
 786 *      Used to set network devices bus interface parameters. This interface
 787 *      is retained for legacy reason, new devices should use the bus
 788 *      interface (PCI) for low level management.
 789 *
 790 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
 791 *      Called when a user wants to change the Maximum Transfer Unit
 792 *      of a device. If not defined, any request to change MTU will
 793 *      will return an error.
 794 *
 795 * void (*ndo_tx_timeout)(struct net_device *dev);
 796 *      Callback uses when the transmitter has not made any progress
 797 *      for dev->watchdog ticks.
 798 *
 799 * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
 800 *                      struct rtnl_link_stats64 *storage);
 801 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
 802 *      Called when a user wants to get the network device usage
 803 *      statistics. Drivers must do one of the following:
 804 *      1. Define @ndo_get_stats64 to fill in a zero-initialised
 805 *         rtnl_link_stats64 structure passed by the caller.
 806 *      2. Define @ndo_get_stats to update a net_device_stats structure
 807 *         (which should normally be dev->stats) and return a pointer to
 808 *         it. The structure may be changed asynchronously only if each
 809 *         field is written atomically.
 810 *      3. Update dev->stats asynchronously and atomically, and define
 811 *         neither operation.
 812 *
 813 * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid);
 814 *      If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
 815 *      this function is called when a VLAN id is registered.
 816 *
 817 * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
 818 *      If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
 819 *      this function is called when a VLAN id is unregistered.
 820 *
 821 * void (*ndo_poll_controller)(struct net_device *dev);
 822 *
 823 *      SR-IOV management functions.
 824 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
 825 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos);
 826 * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate);
 827 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
 828 * int (*ndo_get_vf_config)(struct net_device *dev,
 829 *                          int vf, struct ifla_vf_info *ivf);
 830 * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
 831 *                        struct nlattr *port[]);
 832 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
 833 * int (*ndo_setup_tc)(struct net_device *dev, u8 tc)
 834 *      Called to setup 'tc' number of traffic classes in the net device. This
 835 *      is always called from the stack with the rtnl lock held and netif tx
 836 *      queues stopped. This allows the netdevice to perform queue management
 837 *      safely.
 838 *
 839 *      Fiber Channel over Ethernet (FCoE) offload functions.
 840 * int (*ndo_fcoe_enable)(struct net_device *dev);
 841 *      Called when the FCoE protocol stack wants to start using LLD for FCoE
 842 *      so the underlying device can perform whatever needed configuration or
 843 *      initialization to support acceleration of FCoE traffic.
 844 *
 845 * int (*ndo_fcoe_disable)(struct net_device *dev);
 846 *      Called when the FCoE protocol stack wants to stop using LLD for FCoE
 847 *      so the underlying device can perform whatever needed clean-ups to
 848 *      stop supporting acceleration of FCoE traffic.
 849 *
 850 * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid,
 851 *                           struct scatterlist *sgl, unsigned int sgc);
 852 *      Called when the FCoE Initiator wants to initialize an I/O that
 853 *      is a possible candidate for Direct Data Placement (DDP). The LLD can
 854 *      perform necessary setup and returns 1 to indicate the device is set up
 855 *      successfully to perform DDP on this I/O, otherwise this returns 0.
 856 *
 857 * int (*ndo_fcoe_ddp_done)(struct net_device *dev,  u16 xid);
 858 *      Called when the FCoE Initiator/Target is done with the DDPed I/O as
 859 *      indicated by the FC exchange id 'xid', so the underlying device can
 860 *      clean up and reuse resources for later DDP requests.
 861 *
 862 * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid,
 863 *                            struct scatterlist *sgl, unsigned int sgc);
 864 *      Called when the FCoE Target wants to initialize an I/O that
 865 *      is a possible candidate for Direct Data Placement (DDP). The LLD can
 866 *      perform necessary setup and returns 1 to indicate the device is set up
 867 *      successfully to perform DDP on this I/O, otherwise this returns 0.
 868 *
 869 * int (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
 870 *                             struct netdev_fcoe_hbainfo *hbainfo);
 871 *      Called when the FCoE Protocol stack wants information on the underlying
 872 *      device. This information is utilized by the FCoE protocol stack to
 873 *      register attributes with Fiber Channel management service as per the
 874 *      FC-GS Fabric Device Management Information(FDMI) specification.
 875 *
 876 * int (*ndo_fcoe_get_wwn)(struct net_device *dev, u64 *wwn, int type);
 877 *      Called when the underlying device wants to override default World Wide
 878 *      Name (WWN) generation mechanism in FCoE protocol stack to pass its own
 879 *      World Wide Port Name (WWPN) or World Wide Node Name (WWNN) to the FCoE
 880 *      protocol stack to use.
 881 *
 882 *      RFS acceleration.
 883 * int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb,
 884 *                          u16 rxq_index, u32 flow_id);
 885 *      Set hardware filter for RFS.  rxq_index is the target queue index;
 886 *      flow_id is a flow ID to be passed to rps_may_expire_flow() later.
 887 *      Return the filter ID on success, or a negative error code.
 888 *
 889 *      Slave management functions (for bridge, bonding, etc). User should
 890 *      call netdev_set_master() to set dev->master properly.
 891 * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev);
 892 *      Called to make another netdev an underling.
 893 *
 894 * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev);
 895 *      Called to release previously enslaved netdev.
 896 *
 897 *      Feature/offload setting functions.
 898 * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
 899 *              netdev_features_t features);
 900 *      Adjusts the requested feature flags according to device-specific
 901 *      constraints, and returns the resulting flags. Must not modify
 902 *      the device state.
 903 *
 904 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
 905 *      Called to update device configuration to new features. Passed
 906 *      feature set might be less than what was returned by ndo_fix_features()).
 907 *      Must return >0 or -errno if it changed dev->features itself.
 908 *
 909 * int (*ndo_fdb_add)(struct ndmsg *ndm, struct net_device *dev,
 910 *                    unsigned char *addr, u16 flags)
 911 *      Adds an FDB entry to dev for addr.
 912 * int (*ndo_fdb_del)(struct ndmsg *ndm, struct net_device *dev,
 913 *                    unsigned char *addr)
 914 *      Deletes the FDB entry from dev coresponding to addr.
 915 * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb,
 916 *                     struct net_device *dev, int idx)
 917 *      Used to add FDB entries to dump requests. Implementers should add
 918 *      entries to skb and update idx with the number of entries.
 919 */
 920struct net_device_ops {
 921        int                     (*ndo_init)(struct net_device *dev);
 922        void                    (*ndo_uninit)(struct net_device *dev);
 923        int                     (*ndo_open)(struct net_device *dev);
 924        int                     (*ndo_stop)(struct net_device *dev);
 925        netdev_tx_t             (*ndo_start_xmit) (struct sk_buff *skb,
 926                                                   struct net_device *dev);
 927        u16                     (*ndo_select_queue)(struct net_device *dev,
 928                                                    struct sk_buff *skb);
 929        void                    (*ndo_change_rx_flags)(struct net_device *dev,
 930                                                       int flags);
 931        void                    (*ndo_set_rx_mode)(struct net_device *dev);
 932        int                     (*ndo_set_mac_address)(struct net_device *dev,
 933                                                       void *addr);
 934        int                     (*ndo_validate_addr)(struct net_device *dev);
 935        int                     (*ndo_do_ioctl)(struct net_device *dev,
 936                                                struct ifreq *ifr, int cmd);
 937        int                     (*ndo_set_config)(struct net_device *dev,
 938                                                  struct ifmap *map);
 939        int                     (*ndo_change_mtu)(struct net_device *dev,
 940                                                  int new_mtu);
 941        int                     (*ndo_neigh_setup)(struct net_device *dev,
 942                                                   struct neigh_parms *);
 943        void                    (*ndo_tx_timeout) (struct net_device *dev);
 944
 945        struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
 946                                                     struct rtnl_link_stats64 *storage);
 947        struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
 948
 949        int                     (*ndo_vlan_rx_add_vid)(struct net_device *dev,
 950                                                       unsigned short vid);
 951        int                     (*ndo_vlan_rx_kill_vid)(struct net_device *dev,
 952                                                        unsigned short vid);
 953#ifdef CONFIG_NET_POLL_CONTROLLER
 954        void                    (*ndo_poll_controller)(struct net_device *dev);
 955        int                     (*ndo_netpoll_setup)(struct net_device *dev,
 956                                                     struct netpoll_info *info,
 957                                                     gfp_t gfp);
 958        void                    (*ndo_netpoll_cleanup)(struct net_device *dev);
 959#endif
 960        int                     (*ndo_set_vf_mac)(struct net_device *dev,
 961                                                  int queue, u8 *mac);
 962        int                     (*ndo_set_vf_vlan)(struct net_device *dev,
 963                                                   int queue, u16 vlan, u8 qos);
 964        int                     (*ndo_set_vf_tx_rate)(struct net_device *dev,
 965                                                      int vf, int rate);
 966        int                     (*ndo_set_vf_spoofchk)(struct net_device *dev,
 967                                                       int vf, bool setting);
 968        int                     (*ndo_get_vf_config)(struct net_device *dev,
 969                                                     int vf,
 970                                                     struct ifla_vf_info *ivf);
 971        int                     (*ndo_set_vf_port)(struct net_device *dev,
 972                                                   int vf,
 973                                                   struct nlattr *port[]);
 974        int                     (*ndo_get_vf_port)(struct net_device *dev,
 975                                                   int vf, struct sk_buff *skb);
 976        int                     (*ndo_setup_tc)(struct net_device *dev, u8 tc);
 977#if IS_ENABLED(CONFIG_FCOE)
 978        int                     (*ndo_fcoe_enable)(struct net_device *dev);
 979        int                     (*ndo_fcoe_disable)(struct net_device *dev);
 980        int                     (*ndo_fcoe_ddp_setup)(struct net_device *dev,
 981                                                      u16 xid,
 982                                                      struct scatterlist *sgl,
 983                                                      unsigned int sgc);
 984        int                     (*ndo_fcoe_ddp_done)(struct net_device *dev,
 985                                                     u16 xid);
 986        int                     (*ndo_fcoe_ddp_target)(struct net_device *dev,
 987                                                       u16 xid,
 988                                                       struct scatterlist *sgl,
 989                                                       unsigned int sgc);
 990        int                     (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
 991                                                        struct netdev_fcoe_hbainfo *hbainfo);
 992#endif
 993
 994#if IS_ENABLED(CONFIG_LIBFCOE)
 995#define NETDEV_FCOE_WWNN 0
 996#define NETDEV_FCOE_WWPN 1
 997        int                     (*ndo_fcoe_get_wwn)(struct net_device *dev,
 998                                                    u64 *wwn, int type);
 999#endif
1000
1001#ifdef CONFIG_RFS_ACCEL
1002        int                     (*ndo_rx_flow_steer)(struct net_device *dev,
1003                                                     const struct sk_buff *skb,
1004                                                     u16 rxq_index,
1005                                                     u32 flow_id);
1006#endif
1007        int                     (*ndo_add_slave)(struct net_device *dev,
1008                                                 struct net_device *slave_dev);
1009        int                     (*ndo_del_slave)(struct net_device *dev,
1010                                                 struct net_device *slave_dev);
1011        netdev_features_t       (*ndo_fix_features)(struct net_device *dev,
1012                                                    netdev_features_t features);
1013        int                     (*ndo_set_features)(struct net_device *dev,
1014                                                    netdev_features_t features);
1015        int                     (*ndo_neigh_construct)(struct neighbour *n);
1016        void                    (*ndo_neigh_destroy)(struct neighbour *n);
1017
1018        int                     (*ndo_fdb_add)(struct ndmsg *ndm,
1019                                               struct net_device *dev,
1020                                               unsigned char *addr,
1021                                               u16 flags);
1022        int                     (*ndo_fdb_del)(struct ndmsg *ndm,
1023                                               struct net_device *dev,
1024                                               unsigned char *addr);
1025        int                     (*ndo_fdb_dump)(struct sk_buff *skb,
1026                                                struct netlink_callback *cb,
1027                                                struct net_device *dev,
1028                                                int idx);
1029};
1030
1031/*
1032 *      The DEVICE structure.
1033 *      Actually, this whole structure is a big mistake.  It mixes I/O
1034 *      data with strictly "high-level" data, and it has to know about
1035 *      almost every data structure used in the INET module.
1036 *
1037 *      FIXME: cleanup struct net_device such that network protocol info
1038 *      moves out.
1039 */
1040
1041struct net_device {
1042
1043        /*
1044         * This is the first field of the "visible" part of this structure
1045         * (i.e. as seen by users in the "Space.c" file).  It is the name
1046         * of the interface.
1047         */
1048        char                    name[IFNAMSIZ];
1049
1050        /* device name hash chain, please keep it close to name[] */
1051        struct hlist_node       name_hlist;
1052
1053        /* snmp alias */
1054        char                    *ifalias;
1055
1056        /*
1057         *      I/O specific fields
1058         *      FIXME: Merge these and struct ifmap into one
1059         */
1060        unsigned long           mem_end;        /* shared mem end       */
1061        unsigned long           mem_start;      /* shared mem start     */
1062        unsigned long           base_addr;      /* device I/O address   */
1063        unsigned int            irq;            /* device IRQ number    */
1064
1065        /*
1066         *      Some hardware also needs these fields, but they are not
1067         *      part of the usual set specified in Space.c.
1068         */
1069
1070        unsigned long           state;
1071
1072        struct list_head        dev_list;
1073        struct list_head        napi_list;
1074        struct list_head        unreg_list;
1075
1076        /* currently active device features */
1077        netdev_features_t       features;
1078        /* user-changeable features */
1079        netdev_features_t       hw_features;
1080        /* user-requested features */
1081        netdev_features_t       wanted_features;
1082        /* mask of features inheritable by VLAN devices */
1083        netdev_features_t       vlan_features;
1084
1085        /* Interface index. Unique device identifier    */
1086        int                     ifindex;
1087        int                     iflink;
1088
1089        struct net_device_stats stats;
1090        atomic_long_t           rx_dropped; /* dropped packets by core network
1091                                             * Do not use this in drivers.
1092                                             */
1093
1094#ifdef CONFIG_WIRELESS_EXT
1095        /* List of functions to handle Wireless Extensions (instead of ioctl).
1096         * See <net/iw_handler.h> for details. Jean II */
1097        const struct iw_handler_def *   wireless_handlers;
1098        /* Instance data managed by the core of Wireless Extensions. */
1099        struct iw_public_data * wireless_data;
1100#endif
1101        /* Management operations */
1102        const struct net_device_ops *netdev_ops;
1103        const struct ethtool_ops *ethtool_ops;
1104
1105        /* Hardware header description */
1106        const struct header_ops *header_ops;
1107
1108        unsigned int            flags;  /* interface flags (a la BSD)   */
1109        unsigned int            priv_flags; /* Like 'flags' but invisible to userspace.
1110                                             * See if.h for definitions. */
1111        unsigned short          gflags;
1112        unsigned short          padded; /* How much padding added by alloc_netdev() */
1113
1114        unsigned char           operstate; /* RFC2863 operstate */
1115        unsigned char           link_mode; /* mapping policy to operstate */
1116
1117        unsigned char           if_port;        /* Selectable AUI, TP,..*/
1118        unsigned char           dma;            /* DMA channel          */
1119
1120        unsigned int            mtu;    /* interface MTU value          */
1121        unsigned short          type;   /* interface hardware type      */
1122        unsigned short          hard_header_len;        /* hardware hdr length  */
1123
1124        /* extra head- and tailroom the hardware may need, but not in all cases
1125         * can this be guaranteed, especially tailroom. Some cases also use
1126         * LL_MAX_HEADER instead to allocate the skb.
1127         */
1128        unsigned short          needed_headroom;
1129        unsigned short          needed_tailroom;
1130
1131        /* Interface address info. */
1132        unsigned char           perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
1133        unsigned char           addr_assign_type; /* hw address assignment type */
1134        unsigned char           addr_len;       /* hardware address length      */
1135        unsigned char           neigh_priv_len;
1136        unsigned short          dev_id;         /* for shared network cards */
1137
1138        spinlock_t              addr_list_lock;
1139        struct netdev_hw_addr_list      uc;     /* Unicast mac addresses */
1140        struct netdev_hw_addr_list      mc;     /* Multicast mac addresses */
1141        bool                    uc_promisc;
1142        unsigned int            promiscuity;
1143        unsigned int            allmulti;
1144
1145
1146        /* Protocol specific pointers */
1147
1148#if IS_ENABLED(CONFIG_VLAN_8021Q)
1149        struct vlan_info __rcu  *vlan_info;     /* VLAN info */
1150#endif
1151#if IS_ENABLED(CONFIG_NET_DSA)
1152        struct dsa_switch_tree  *dsa_ptr;       /* dsa specific data */
1153#endif
1154        void                    *atalk_ptr;     /* AppleTalk link       */
1155        struct in_device __rcu  *ip_ptr;        /* IPv4 specific data   */
1156        struct dn_dev __rcu     *dn_ptr;        /* DECnet specific data */
1157        struct inet6_dev __rcu  *ip6_ptr;       /* IPv6 specific data */
1158        void                    *ax25_ptr;      /* AX.25 specific data */
1159        struct wireless_dev     *ieee80211_ptr; /* IEEE 802.11 specific data,
1160                                                   assign before registering */
1161
1162/*
1163 * Cache lines mostly used on receive path (including eth_type_trans())
1164 */
1165        unsigned long           last_rx;        /* Time of last Rx
1166                                                 * This should not be set in
1167                                                 * drivers, unless really needed,
1168                                                 * because network stack (bonding)
1169                                                 * use it if/when necessary, to
1170                                                 * avoid dirtying this cache line.
1171                                                 */
1172
1173        struct net_device       *master; /* Pointer to master device of a group,
1174                                          * which this device is member of.
1175                                          */
1176
1177        /* Interface address info used in eth_type_trans() */
1178        unsigned char           *dev_addr;      /* hw address, (before bcast
1179                                                   because most packets are
1180                                                   unicast) */
1181
1182        struct netdev_hw_addr_list      dev_addrs; /* list of device
1183                                                      hw addresses */
1184
1185        unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
1186
1187#ifdef CONFIG_SYSFS
1188        struct kset             *queues_kset;
1189#endif
1190
1191#ifdef CONFIG_RPS
1192        struct netdev_rx_queue  *_rx;
1193
1194        /* Number of RX queues allocated at register_netdev() time */
1195        unsigned int            num_rx_queues;
1196
1197        /* Number of RX queues currently active in device */
1198        unsigned int            real_num_rx_queues;
1199
1200#ifdef CONFIG_RFS_ACCEL
1201        /* CPU reverse-mapping for RX completion interrupts, indexed
1202         * by RX queue number.  Assigned by driver.  This must only be
1203         * set if the ndo_rx_flow_steer operation is defined. */
1204        struct cpu_rmap         *rx_cpu_rmap;
1205#endif
1206#endif
1207
1208        rx_handler_func_t __rcu *rx_handler;
1209        void __rcu              *rx_handler_data;
1210
1211        struct netdev_queue __rcu *ingress_queue;
1212
1213/*
1214 * Cache lines mostly used on transmit path
1215 */
1216        struct netdev_queue     *_tx ____cacheline_aligned_in_smp;
1217
1218        /* Number of TX queues allocated at alloc_netdev_mq() time  */
1219        unsigned int            num_tx_queues;
1220
1221        /* Number of TX queues currently active in device  */
1222        unsigned int            real_num_tx_queues;
1223
1224        /* root qdisc from userspace point of view */
1225        struct Qdisc            *qdisc;
1226
1227        unsigned long           tx_queue_len;   /* Max frames per queue allowed */
1228        spinlock_t              tx_global_lock;
1229
1230#ifdef CONFIG_XPS
1231        struct xps_dev_maps __rcu *xps_maps;
1232#endif
1233
1234        /* These may be needed for future network-power-down code. */
1235
1236        /*
1237         * trans_start here is expensive for high speed devices on SMP,
1238         * please use netdev_queue->trans_start instead.
1239         */
1240        unsigned long           trans_start;    /* Time (in jiffies) of last Tx */
1241
1242        int                     watchdog_timeo; /* used by dev_watchdog() */
1243        struct timer_list       watchdog_timer;
1244
1245        /* Number of references to this device */
1246        int __percpu            *pcpu_refcnt;
1247
1248        /* delayed register/unregister */
1249        struct list_head        todo_list;
1250        /* device index hash chain */
1251        struct hlist_node       index_hlist;
1252
1253        struct list_head        link_watch_list;
1254
1255        /* register/unregister state machine */
1256        enum { NETREG_UNINITIALIZED=0,
1257               NETREG_REGISTERED,       /* completed register_netdevice */
1258               NETREG_UNREGISTERING,    /* called unregister_netdevice */
1259               NETREG_UNREGISTERED,     /* completed unregister todo */
1260               NETREG_RELEASED,         /* called free_netdev */
1261               NETREG_DUMMY,            /* dummy device for NAPI poll */
1262        } reg_state:8;
1263
1264        bool dismantle; /* device is going do be freed */
1265
1266        enum {
1267                RTNL_LINK_INITIALIZED,
1268                RTNL_LINK_INITIALIZING,
1269        } rtnl_link_state:16;
1270
1271        /* Called from unregister, can be used to call free_netdev */
1272        void (*destructor)(struct net_device *dev);
1273
1274#ifdef CONFIG_NETPOLL
1275        struct netpoll_info     *npinfo;
1276#endif
1277
1278#ifdef CONFIG_NET_NS
1279        /* Network namespace this network device is inside */
1280        struct net              *nd_net;
1281#endif
1282
1283        /* mid-layer private */
1284        union {
1285                void                            *ml_priv;
1286                struct pcpu_lstats __percpu     *lstats; /* loopback stats */
1287                struct pcpu_tstats __percpu     *tstats; /* tunnel stats */
1288                struct pcpu_dstats __percpu     *dstats; /* dummy stats */
1289        };
1290        /* GARP */
1291        struct garp_port __rcu  *garp_port;
1292
1293        /* class/net/name entry */
1294        struct device           dev;
1295        /* space for optional device, statistics, and wireless sysfs groups */
1296        const struct attribute_group *sysfs_groups[4];
1297
1298        /* rtnetlink link ops */
1299        const struct rtnl_link_ops *rtnl_link_ops;
1300
1301        /* for setting kernel sock attribute on TCP connection setup */
1302#define GSO_MAX_SIZE            65536
1303        unsigned int            gso_max_size;
1304#define GSO_MAX_SEGS            65535
1305        u16                     gso_max_segs;
1306
1307#ifdef CONFIG_DCB
1308        /* Data Center Bridging netlink ops */
1309        const struct dcbnl_rtnl_ops *dcbnl_ops;
1310#endif
1311        u8 num_tc;
1312        struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
1313        u8 prio_tc_map[TC_BITMASK + 1];
1314
1315#if IS_ENABLED(CONFIG_FCOE)
1316        /* max exchange id for FCoE LRO by ddp */
1317        unsigned int            fcoe_ddp_xid;
1318#endif
1319#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
1320        struct netprio_map __rcu *priomap;
1321#endif
1322        /* phy device may attach itself for hardware timestamping */
1323        struct phy_device *phydev;
1324
1325        /* group the device belongs to */
1326        int group;
1327
1328        struct pm_qos_request   pm_qos_req;
1329};
1330#define to_net_dev(d) container_of(d, struct net_device, dev)
1331
1332#define NETDEV_ALIGN            32
1333
1334static inline
1335int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio)
1336{
1337        return dev->prio_tc_map[prio & TC_BITMASK];
1338}
1339
1340static inline
1341int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc)
1342{
1343        if (tc >= dev->num_tc)
1344                return -EINVAL;
1345
1346        dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK;
1347        return 0;
1348}
1349
1350static inline
1351void netdev_reset_tc(struct net_device *dev)
1352{
1353        dev->num_tc = 0;
1354        memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq));
1355        memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map));
1356}
1357
1358static inline
1359int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset)
1360{
1361        if (tc >= dev->num_tc)
1362                return -EINVAL;
1363
1364        dev->tc_to_txq[tc].count = count;
1365        dev->tc_to_txq[tc].offset = offset;
1366        return 0;
1367}
1368
1369static inline
1370int netdev_set_num_tc(struct net_device *dev, u8 num_tc)
1371{
1372        if (num_tc > TC_MAX_QUEUE)
1373                return -EINVAL;
1374
1375        dev->num_tc = num_tc;
1376        return 0;
1377}
1378
1379static inline
1380int netdev_get_num_tc(struct net_device *dev)
1381{
1382        return dev->num_tc;
1383}
1384
1385static inline
1386struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
1387                                         unsigned int index)
1388{
1389        return &dev->_tx[index];
1390}
1391
1392static inline void netdev_for_each_tx_queue(struct net_device *dev,
1393                                            void (*f)(struct net_device *,
1394                                                      struct netdev_queue *,
1395                                                      void *),
1396                                            void *arg)
1397{
1398        unsigned int i;
1399
1400        for (i = 0; i < dev->num_tx_queues; i++)
1401                f(dev, &dev->_tx[i], arg);
1402}
1403
1404/*
1405 * Net namespace inlines
1406 */
1407static inline
1408struct net *dev_net(const struct net_device *dev)
1409{
1410        return read_pnet(&dev->nd_net);
1411}
1412
1413static inline
1414void dev_net_set(struct net_device *dev, struct net *net)
1415{
1416#ifdef CONFIG_NET_NS
1417        release_net(dev->nd_net);
1418        dev->nd_net = hold_net(net);
1419#endif
1420}
1421
1422static inline bool netdev_uses_dsa_tags(struct net_device *dev)
1423{
1424#ifdef CONFIG_NET_DSA_TAG_DSA
1425        if (dev->dsa_ptr != NULL)
1426                return dsa_uses_dsa_tags(dev->dsa_ptr);
1427#endif
1428
1429        return 0;
1430}
1431
1432static inline bool netdev_uses_trailer_tags(struct net_device *dev)
1433{
1434#ifdef CONFIG_NET_DSA_TAG_TRAILER
1435        if (dev->dsa_ptr != NULL)
1436                return dsa_uses_trailer_tags(dev->dsa_ptr);
1437#endif
1438
1439        return 0;
1440}
1441
1442/**
1443 *      netdev_priv - access network device private data
1444 *      @dev: network device
1445 *
1446 * Get network device private data
1447 */
1448static inline void *netdev_priv(const struct net_device *dev)
1449{
1450        return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
1451}
1452
1453/* Set the sysfs physical device reference for the network logical device
1454 * if set prior to registration will cause a symlink during initialization.
1455 */
1456#define SET_NETDEV_DEV(net, pdev)       ((net)->dev.parent = (pdev))
1457
1458/* Set the sysfs device type for the network logical device to allow
1459 * fin grained indentification of different network device types. For
1460 * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
1461 */
1462#define SET_NETDEV_DEVTYPE(net, devtype)        ((net)->dev.type = (devtype))
1463
1464/**
1465 *      netif_napi_add - initialize a napi context
1466 *      @dev:  network device
1467 *      @napi: napi context
1468 *      @poll: polling function
1469 *      @weight: default weight
1470 *
1471 * netif_napi_add() must be used to initialize a napi context prior to calling
1472 * *any* of the other napi related functions.
1473 */
1474void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
1475                    int (*poll)(struct napi_struct *, int), int weight);
1476
1477/**
1478 *  netif_napi_del - remove a napi context
1479 *  @napi: napi context
1480 *
1481 *  netif_napi_del() removes a napi context from the network device napi list
1482 */
1483void netif_napi_del(struct napi_struct *napi);
1484
1485struct napi_gro_cb {
1486        /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
1487        void *frag0;
1488
1489        /* Length of frag0. */
1490        unsigned int frag0_len;
1491
1492        /* This indicates where we are processing relative to skb->data. */
1493        int data_offset;
1494
1495        /* This is non-zero if the packet may be of the same flow. */
1496        int same_flow;
1497
1498        /* This is non-zero if the packet cannot be merged with the new skb. */
1499        int flush;
1500
1501        /* Number of segments aggregated. */
1502        int count;
1503
1504        /* Free the skb? */
1505        int free;
1506#define NAPI_GRO_FREE             1
1507#define NAPI_GRO_FREE_STOLEN_HEAD 2
1508};
1509
1510#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1511
1512struct packet_type {
1513        __be16                  type;   /* This is really htons(ether_type). */
1514        struct net_device       *dev;   /* NULL is wildcarded here           */
1515        int                     (*func) (struct sk_buff *,
1516                                         struct net_device *,
1517                                         struct packet_type *,
1518                                         struct net_device *);
1519        struct sk_buff          *(*gso_segment)(struct sk_buff *skb,
1520                                                netdev_features_t features);
1521        int                     (*gso_send_check)(struct sk_buff *skb);
1522        struct sk_buff          **(*gro_receive)(struct sk_buff **head,
1523                                               struct sk_buff *skb);
1524        int                     (*gro_complete)(struct sk_buff *skb);
1525        bool                    (*id_match)(struct packet_type *ptype,
1526                                            struct sock *sk);
1527        void                    *af_packet_priv;
1528        struct list_head        list;
1529};
1530
1531#include <linux/notifier.h>
1532
1533/* netdevice notifier chain. Please remember to update the rtnetlink
1534 * notification exclusion list in rtnetlink_event() when adding new
1535 * types.
1536 */
1537#define NETDEV_UP       0x0001  /* For now you can't veto a device up/down */
1538#define NETDEV_DOWN     0x0002
1539#define NETDEV_REBOOT   0x0003  /* Tell a protocol stack a network interface
1540                                   detected a hardware crash and restarted
1541                                   - we can use this eg to kick tcp sessions
1542                                   once done */
1543#define NETDEV_CHANGE   0x0004  /* Notify device state change */
1544#define NETDEV_REGISTER 0x0005
1545#define NETDEV_UNREGISTER       0x0006
1546#define NETDEV_CHANGEMTU        0x0007
1547#define NETDEV_CHANGEADDR       0x0008
1548#define NETDEV_GOING_DOWN       0x0009
1549#define NETDEV_CHANGENAME       0x000A
1550#define NETDEV_FEAT_CHANGE      0x000B
1551#define NETDEV_BONDING_FAILOVER 0x000C
1552#define NETDEV_PRE_UP           0x000D
1553#define NETDEV_PRE_TYPE_CHANGE  0x000E
1554#define NETDEV_POST_TYPE_CHANGE 0x000F
1555#define NETDEV_POST_INIT        0x0010
1556#define NETDEV_UNREGISTER_BATCH 0x0011
1557#define NETDEV_RELEASE          0x0012
1558#define NETDEV_NOTIFY_PEERS     0x0013
1559#define NETDEV_JOIN             0x0014
1560
1561extern int register_netdevice_notifier(struct notifier_block *nb);
1562extern int unregister_netdevice_notifier(struct notifier_block *nb);
1563extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1564
1565
1566extern rwlock_t                         dev_base_lock;          /* Device list lock */
1567
1568
1569#define for_each_netdev(net, d)         \
1570                list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1571#define for_each_netdev_reverse(net, d) \
1572                list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
1573#define for_each_netdev_rcu(net, d)             \
1574                list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
1575#define for_each_netdev_safe(net, d, n) \
1576                list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
1577#define for_each_netdev_continue(net, d)                \
1578                list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
1579#define for_each_netdev_continue_rcu(net, d)            \
1580        list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
1581#define net_device_entry(lh)    list_entry(lh, struct net_device, dev_list)
1582
1583static inline struct net_device *next_net_device(struct net_device *dev)
1584{
1585        struct list_head *lh;
1586        struct net *net;
1587
1588        net = dev_net(dev);
1589        lh = dev->dev_list.next;
1590        return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1591}
1592
1593static inline struct net_device *next_net_device_rcu(struct net_device *dev)
1594{
1595        struct list_head *lh;
1596        struct net *net;
1597
1598        net = dev_net(dev);
1599        lh = rcu_dereference(list_next_rcu(&dev->dev_list));
1600        return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1601}
1602
1603static inline struct net_device *first_net_device(struct net *net)
1604{
1605        return list_empty(&net->dev_base_head) ? NULL :
1606                net_device_entry(net->dev_base_head.next);
1607}
1608
1609static inline struct net_device *first_net_device_rcu(struct net *net)
1610{
1611        struct list_head *lh = rcu_dereference(list_next_rcu(&net->dev_base_head));
1612
1613        return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1614}
1615
1616extern int                      netdev_boot_setup_check(struct net_device *dev);
1617extern unsigned long            netdev_boot_base(const char *prefix, int unit);
1618extern struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
1619                                              const char *hwaddr);
1620extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
1621extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
1622extern void             dev_add_pack(struct packet_type *pt);
1623extern void             dev_remove_pack(struct packet_type *pt);
1624extern void             __dev_remove_pack(struct packet_type *pt);
1625
1626extern struct net_device        *dev_get_by_flags_rcu(struct net *net, unsigned short flags,
1627                                                      unsigned short mask);
1628extern struct net_device        *dev_get_by_name(struct net *net, const char *name);
1629extern struct net_device        *dev_get_by_name_rcu(struct net *net, const char *name);
1630extern struct net_device        *__dev_get_by_name(struct net *net, const char *name);
1631extern int              dev_alloc_name(struct net_device *dev, const char *name);
1632extern int              dev_open(struct net_device *dev);
1633extern int              dev_close(struct net_device *dev);
1634extern void             dev_disable_lro(struct net_device *dev);
1635extern int              dev_loopback_xmit(struct sk_buff *newskb);
1636extern int              dev_queue_xmit(struct sk_buff *skb);
1637extern int              register_netdevice(struct net_device *dev);
1638extern void             unregister_netdevice_queue(struct net_device *dev,
1639                                                   struct list_head *head);
1640extern void             unregister_netdevice_many(struct list_head *head);
1641static inline void unregister_netdevice(struct net_device *dev)
1642{
1643        unregister_netdevice_queue(dev, NULL);
1644}
1645
1646extern int              netdev_refcnt_read(const struct net_device *dev);
1647extern void             free_netdev(struct net_device *dev);
1648extern void             synchronize_net(void);
1649extern int              init_dummy_netdev(struct net_device *dev);
1650extern void             netdev_resync_ops(struct net_device *dev);
1651
1652extern struct net_device        *dev_get_by_index(struct net *net, int ifindex);
1653extern struct net_device        *__dev_get_by_index(struct net *net, int ifindex);
1654extern struct net_device        *dev_get_by_index_rcu(struct net *net, int ifindex);
1655extern int              dev_restart(struct net_device *dev);
1656#ifdef CONFIG_NETPOLL_TRAP
1657extern int              netpoll_trap(void);
1658#endif
1659extern int             skb_gro_receive(struct sk_buff **head,
1660                                       struct sk_buff *skb);
1661extern void            skb_gro_reset_offset(struct sk_buff *skb);
1662
1663static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
1664{
1665        return NAPI_GRO_CB(skb)->data_offset;
1666}
1667
1668static inline unsigned int skb_gro_len(const struct sk_buff *skb)
1669{
1670        return skb->len - NAPI_GRO_CB(skb)->data_offset;
1671}
1672
1673static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
1674{
1675        NAPI_GRO_CB(skb)->data_offset += len;
1676}
1677
1678static inline void *skb_gro_header_fast(struct sk_buff *skb,
1679                                        unsigned int offset)
1680{
1681        return NAPI_GRO_CB(skb)->frag0 + offset;
1682}
1683
1684static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
1685{
1686        return NAPI_GRO_CB(skb)->frag0_len < hlen;
1687}
1688
1689static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
1690                                        unsigned int offset)
1691{
1692        if (!pskb_may_pull(skb, hlen))
1693                return NULL;
1694
1695        NAPI_GRO_CB(skb)->frag0 = NULL;
1696        NAPI_GRO_CB(skb)->frag0_len = 0;
1697        return skb->data + offset;
1698}
1699
1700static inline void *skb_gro_mac_header(struct sk_buff *skb)
1701{
1702        return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1703}
1704
1705static inline void *skb_gro_network_header(struct sk_buff *skb)
1706{
1707        return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
1708               skb_network_offset(skb);
1709}
1710
1711static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
1712                                  unsigned short type,
1713                                  const void *daddr, const void *saddr,
1714                                  unsigned int len)
1715{
1716        if (!dev->header_ops || !dev->header_ops->create)
1717                return 0;
1718
1719        return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1720}
1721
1722static inline int dev_parse_header(const struct sk_buff *skb,
1723                                   unsigned char *haddr)
1724{
1725        const struct net_device *dev = skb->dev;
1726
1727        if (!dev->header_ops || !dev->header_ops->parse)
1728                return 0;
1729        return dev->header_ops->parse(skb, haddr);
1730}
1731
1732typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
1733extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
1734static inline int unregister_gifconf(unsigned int family)
1735{
1736        return register_gifconf(family, NULL);
1737}
1738
1739/*
1740 * Incoming packets are placed on per-cpu queues
1741 */
1742struct softnet_data {
1743        struct Qdisc            *output_queue;
1744        struct Qdisc            **output_queue_tailp;
1745        struct list_head        poll_list;
1746        struct sk_buff          *completion_queue;
1747        struct sk_buff_head     process_queue;
1748
1749        /* stats */
1750        unsigned int            processed;
1751        unsigned int            time_squeeze;
1752        unsigned int            cpu_collision;
1753        unsigned int            received_rps;
1754
1755#ifdef CONFIG_RPS
1756        struct softnet_data     *rps_ipi_list;
1757
1758        /* Elements below can be accessed between CPUs for RPS */
1759        struct call_single_data csd ____cacheline_aligned_in_smp;
1760        struct softnet_data     *rps_ipi_next;
1761        unsigned int            cpu;
1762        unsigned int            input_queue_head;
1763        unsigned int            input_queue_tail;
1764#endif
1765        unsigned int            dropped;
1766        struct sk_buff_head     input_pkt_queue;
1767        struct napi_struct      backlog;
1768};
1769
1770static inline void input_queue_head_incr(struct softnet_data *sd)
1771{
1772#ifdef CONFIG_RPS
1773        sd->input_queue_head++;
1774#endif
1775}
1776
1777static inline void input_queue_tail_incr_save(struct softnet_data *sd,
1778                                              unsigned int *qtail)
1779{
1780#ifdef CONFIG_RPS
1781        *qtail = ++sd->input_queue_tail;
1782#endif
1783}
1784
1785DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
1786
1787extern void __netif_schedule(struct Qdisc *q);
1788
1789static inline void netif_schedule_queue(struct netdev_queue *txq)
1790{
1791        if (!(txq->state & QUEUE_STATE_ANY_XOFF))
1792                __netif_schedule(txq->qdisc);
1793}
1794
1795static inline void netif_tx_schedule_all(struct net_device *dev)
1796{
1797        unsigned int i;
1798
1799        for (i = 0; i < dev->num_tx_queues; i++)
1800                netif_schedule_queue(netdev_get_tx_queue(dev, i));
1801}
1802
1803static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
1804{
1805        clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1806}
1807
1808/**
1809 *      netif_start_queue - allow transmit
1810 *      @dev: network device
1811 *
1812 *      Allow upper layers to call the device hard_start_xmit routine.
1813 */
1814static inline void netif_start_queue(struct net_device *dev)
1815{
1816        netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
1817}
1818
1819static inline void netif_tx_start_all_queues(struct net_device *dev)
1820{
1821        unsigned int i;
1822
1823        for (i = 0; i < dev->num_tx_queues; i++) {
1824                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1825                netif_tx_start_queue(txq);
1826        }
1827}
1828
1829static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
1830{
1831#ifdef CONFIG_NETPOLL_TRAP
1832        if (netpoll_trap()) {
1833                netif_tx_start_queue(dev_queue);
1834                return;
1835        }
1836#endif
1837        if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state))
1838                __netif_schedule(dev_queue->qdisc);
1839}
1840
1841/**
1842 *      netif_wake_queue - restart transmit
1843 *      @dev: network device
1844 *
1845 *      Allow upper layers to call the device hard_start_xmit routine.
1846 *      Used for flow control when transmit resources are available.
1847 */
1848static inline void netif_wake_queue(struct net_device *dev)
1849{
1850        netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
1851}
1852
1853static inline void netif_tx_wake_all_queues(struct net_device *dev)
1854{
1855        unsigned int i;
1856
1857        for (i = 0; i < dev->num_tx_queues; i++) {
1858                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1859                netif_tx_wake_queue(txq);
1860        }
1861}
1862
1863static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
1864{
1865        if (WARN_ON(!dev_queue)) {
1866                pr_info("netif_stop_queue() cannot be called before register_netdev()\n");
1867                return;
1868        }
1869        set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1870}
1871
1872/**
1873 *      netif_stop_queue - stop transmitted packets
1874 *      @dev: network device
1875 *
1876 *      Stop upper layers calling the device hard_start_xmit routine.
1877 *      Used for flow control when transmit resources are unavailable.
1878 */
1879static inline void netif_stop_queue(struct net_device *dev)
1880{
1881        netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
1882}
1883
1884static inline void netif_tx_stop_all_queues(struct net_device *dev)
1885{
1886        unsigned int i;
1887
1888        for (i = 0; i < dev->num_tx_queues; i++) {
1889                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1890                netif_tx_stop_queue(txq);
1891        }
1892}
1893
1894static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
1895{
1896        return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1897}
1898
1899/**
1900 *      netif_queue_stopped - test if transmit queue is flowblocked
1901 *      @dev: network device
1902 *
1903 *      Test if transmit queue on device is currently unable to send.
1904 */
1905static inline bool netif_queue_stopped(const struct net_device *dev)
1906{
1907        return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
1908}
1909
1910static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue)
1911{
1912        return dev_queue->state & QUEUE_STATE_ANY_XOFF;
1913}
1914
1915static inline bool netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
1916{
1917        return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
1918}
1919
1920static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
1921                                        unsigned int bytes)
1922{
1923#ifdef CONFIG_BQL
1924        dql_queued(&dev_queue->dql, bytes);
1925
1926        if (likely(dql_avail(&dev_queue->dql) >= 0))
1927                return;
1928
1929        set_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
1930
1931        /*
1932         * The XOFF flag must be set before checking the dql_avail below,
1933         * because in netdev_tx_completed_queue we update the dql_completed
1934         * before checking the XOFF flag.
1935         */
1936        smp_mb();
1937
1938        /* check again in case another CPU has just made room avail */
1939        if (unlikely(dql_avail(&dev_queue->dql) >= 0))
1940                clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
1941#endif
1942}
1943
1944static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes)
1945{
1946        netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes);
1947}
1948
1949static inline void netdev_tx_completed_queue(struct netdev_queue *dev_queue,
1950                                             unsigned int pkts, unsigned int bytes)
1951{
1952#ifdef CONFIG_BQL
1953        if (unlikely(!bytes))
1954                return;
1955
1956        dql_completed(&dev_queue->dql, bytes);
1957
1958        /*
1959         * Without the memory barrier there is a small possiblity that
1960         * netdev_tx_sent_queue will miss the update and cause the queue to
1961         * be stopped forever
1962         */
1963        smp_mb();
1964
1965        if (dql_avail(&dev_queue->dql) < 0)
1966                return;
1967
1968        if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state))
1969                netif_schedule_queue(dev_queue);
1970#endif
1971}
1972
1973static inline void netdev_completed_queue(struct net_device *dev,
1974                                          unsigned int pkts, unsigned int bytes)
1975{
1976        netdev_tx_completed_queue(netdev_get_tx_queue(dev, 0), pkts, bytes);
1977}
1978
1979static inline void netdev_tx_reset_queue(struct netdev_queue *q)
1980{
1981#ifdef CONFIG_BQL
1982        clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state);
1983        dql_reset(&q->dql);
1984#endif
1985}
1986
1987static inline void netdev_reset_queue(struct net_device *dev_queue)
1988{
1989        netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
1990}
1991
1992/**
1993 *      netif_running - test if up
1994 *      @dev: network device
1995 *
1996 *      Test if the device has been brought up.
1997 */
1998static inline bool netif_running(const struct net_device *dev)
1999{
2000        return test_bit(__LINK_STATE_START, &dev->state);
2001}
2002
2003/*
2004 * Routines to manage the subqueues on a device.  We only need start
2005 * stop, and a check if it's stopped.  All other device management is
2006 * done at the overall netdevice level.
2007 * Also test the device if we're multiqueue.
2008 */
2009
2010/**
2011 *      netif_start_subqueue - allow sending packets on subqueue
2012 *      @dev: network device
2013 *      @queue_index: sub queue index
2014 *
2015 * Start individual transmit queue of a device with multiple transmit queues.
2016 */
2017static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
2018{
2019        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2020
2021        netif_tx_start_queue(txq);
2022}
2023
2024/**
2025 *      netif_stop_subqueue - stop sending packets on subqueue
2026 *      @dev: network device
2027 *      @queue_index: sub queue index
2028 *
2029 * Stop individual transmit queue of a device with multiple transmit queues.
2030 */
2031static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
2032{
2033        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2034#ifdef CONFIG_NETPOLL_TRAP
2035        if (netpoll_trap())
2036                return;
2037#endif
2038        netif_tx_stop_queue(txq);
2039}
2040
2041/**
2042 *      netif_subqueue_stopped - test status of subqueue
2043 *      @dev: network device
2044 *      @queue_index: sub queue index
2045 *
2046 * Check individual transmit queue of a device with multiple transmit queues.
2047 */
2048static inline bool __netif_subqueue_stopped(const struct net_device *dev,
2049                                            u16 queue_index)
2050{
2051        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2052
2053        return netif_tx_queue_stopped(txq);
2054}
2055
2056static inline bool netif_subqueue_stopped(const struct net_device *dev,
2057                                          struct sk_buff *skb)
2058{
2059        return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
2060}
2061
2062/**
2063 *      netif_wake_subqueue - allow sending packets on subqueue
2064 *      @dev: network device
2065 *      @queue_index: sub queue index
2066 *
2067 * Resume individual transmit queue of a device with multiple transmit queues.
2068 */
2069static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
2070{
2071        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2072#ifdef CONFIG_NETPOLL_TRAP
2073        if (netpoll_trap())
2074                return;
2075#endif
2076        if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &txq->state))
2077                __netif_schedule(txq->qdisc);
2078}
2079
2080/*
2081 * Returns a Tx hash for the given packet when dev->real_num_tx_queues is used
2082 * as a distribution range limit for the returned value.
2083 */
2084static inline u16 skb_tx_hash(const struct net_device *dev,
2085                              const struct sk_buff *skb)
2086{
2087        return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
2088}
2089
2090/**
2091 *      netif_is_multiqueue - test if device has multiple transmit queues
2092 *      @dev: network device
2093 *
2094 * Check if device has multiple transmit queues
2095 */
2096static inline bool netif_is_multiqueue(const struct net_device *dev)
2097{
2098        return dev->num_tx_queues > 1;
2099}
2100
2101extern int netif_set_real_num_tx_queues(struct net_device *dev,
2102                                        unsigned int txq);
2103
2104#ifdef CONFIG_RPS
2105extern int netif_set_real_num_rx_queues(struct net_device *dev,
2106                                        unsigned int rxq);
2107#else
2108static inline int netif_set_real_num_rx_queues(struct net_device *dev,
2109                                                unsigned int rxq)
2110{
2111        return 0;
2112}
2113#endif
2114
2115static inline int netif_copy_real_num_queues(struct net_device *to_dev,
2116                                             const struct net_device *from_dev)
2117{
2118        int err;
2119
2120        err = netif_set_real_num_tx_queues(to_dev,
2121                                           from_dev->real_num_tx_queues);
2122        if (err)
2123                return err;
2124#ifdef CONFIG_RPS
2125        return netif_set_real_num_rx_queues(to_dev,
2126                                            from_dev->real_num_rx_queues);
2127#else
2128        return 0;
2129#endif
2130}
2131
2132#define DEFAULT_MAX_NUM_RSS_QUEUES      (8)
2133extern int netif_get_num_default_rss_queues(void);
2134
2135/* Use this variant when it is known for sure that it
2136 * is executing from hardware interrupt context or with hardware interrupts
2137 * disabled.
2138 */
2139extern void dev_kfree_skb_irq(struct sk_buff *skb);
2140
2141/* Use this variant in places where it could be invoked
2142 * from either hardware interrupt or other context, with hardware interrupts
2143 * either disabled or enabled.
2144 */
2145extern void dev_kfree_skb_any(struct sk_buff *skb);
2146
2147extern int              netif_rx(struct sk_buff *skb);
2148extern int              netif_rx_ni(struct sk_buff *skb);
2149extern int              netif_receive_skb(struct sk_buff *skb);
2150extern gro_result_t     dev_gro_receive(struct napi_struct *napi,
2151                                        struct sk_buff *skb);
2152extern gro_result_t     napi_skb_finish(gro_result_t ret, struct sk_buff *skb);
2153extern gro_result_t     napi_gro_receive(struct napi_struct *napi,
2154                                         struct sk_buff *skb);
2155extern void             napi_gro_flush(struct napi_struct *napi);
2156extern struct sk_buff * napi_get_frags(struct napi_struct *napi);
2157extern gro_result_t     napi_frags_finish(struct napi_struct *napi,
2158                                          struct sk_buff *skb,
2159                                          gro_result_t ret);
2160extern gro_result_t     napi_gro_frags(struct napi_struct *napi);
2161
2162static inline void napi_free_frags(struct napi_struct *napi)
2163{
2164        kfree_skb(napi->skb);
2165        napi->skb = NULL;
2166}
2167
2168extern int netdev_rx_handler_register(struct net_device *dev,
2169                                      rx_handler_func_t *rx_handler,
2170                                      void *rx_handler_data);
2171extern void netdev_rx_handler_unregister(struct net_device *dev);
2172
2173extern bool             dev_valid_name(const char *name);
2174extern int              dev_ioctl(struct net *net, unsigned int cmd, void __user *);
2175extern int              dev_ethtool(struct net *net, struct ifreq *);
2176extern unsigned int     dev_get_flags(const struct net_device *);
2177extern int              __dev_change_flags(struct net_device *, unsigned int flags);
2178extern int              dev_change_flags(struct net_device *, unsigned int);
2179extern void             __dev_notify_flags(struct net_device *, unsigned int old_flags);
2180extern int              dev_change_name(struct net_device *, const char *);
2181extern int              dev_set_alias(struct net_device *, const char *, size_t);
2182extern int              dev_change_net_namespace(struct net_device *,
2183                                                 struct net *, const char *);
2184extern int              dev_set_mtu(struct net_device *, int);
2185extern void             dev_set_group(struct net_device *, int);
2186extern int              dev_set_mac_address(struct net_device *,
2187                                            struct sockaddr *);
2188extern int              dev_hard_start_xmit(struct sk_buff *skb,
2189                                            struct net_device *dev,
2190                                            struct netdev_queue *txq);
2191extern int              dev_forward_skb(struct net_device *dev,
2192                                        struct sk_buff *skb);
2193
2194extern int              netdev_budget;
2195
2196/* Called by rtnetlink.c:rtnl_unlock() */
2197extern void netdev_run_todo(void);
2198
2199/**
2200 *      dev_put - release reference to device
2201 *      @dev: network device
2202 *
2203 * Release reference to device to allow it to be freed.
2204 */
2205static inline void dev_put(struct net_device *dev)
2206{
2207        this_cpu_dec(*dev->pcpu_refcnt);
2208}
2209
2210/**
2211 *      dev_hold - get reference to device
2212 *      @dev: network device
2213 *
2214 * Hold reference to device to keep it from being freed.
2215 */
2216static inline void dev_hold(struct net_device *dev)
2217{
2218        this_cpu_inc(*dev->pcpu_refcnt);
2219}
2220
2221/* Carrier loss detection, dial on demand. The functions netif_carrier_on
2222 * and _off may be called from IRQ context, but it is caller
2223 * who is responsible for serialization of these calls.
2224 *
2225 * The name carrier is inappropriate, these functions should really be
2226 * called netif_lowerlayer_*() because they represent the state of any
2227 * kind of lower layer not just hardware media.
2228 */
2229
2230extern void linkwatch_fire_event(struct net_device *dev);
2231extern void linkwatch_forget_dev(struct net_device *dev);
2232
2233/**
2234 *      netif_carrier_ok - test if carrier present
2235 *      @dev: network device
2236 *
2237 * Check if carrier is present on device
2238 */
2239static inline bool netif_carrier_ok(const struct net_device *dev)
2240{
2241        return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
2242}
2243
2244extern unsigned long dev_trans_start(struct net_device *dev);
2245
2246extern void __netdev_watchdog_up(struct net_device *dev);
2247
2248extern void netif_carrier_on(struct net_device *dev);
2249
2250extern void netif_carrier_off(struct net_device *dev);
2251
2252extern void netif_notify_peers(struct net_device *dev);
2253
2254/**
2255 *      netif_dormant_on - mark device as dormant.
2256 *      @dev: network device
2257 *
2258 * Mark device as dormant (as per RFC2863).
2259 *
2260 * The dormant state indicates that the relevant interface is not
2261 * actually in a condition to pass packets (i.e., it is not 'up') but is
2262 * in a "pending" state, waiting for some external event.  For "on-
2263 * demand" interfaces, this new state identifies the situation where the
2264 * interface is waiting for events to place it in the up state.
2265 *
2266 */
2267static inline void netif_dormant_on(struct net_device *dev)
2268{
2269        if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
2270                linkwatch_fire_event(dev);
2271}
2272
2273/**
2274 *      netif_dormant_off - set device as not dormant.
2275 *      @dev: network device
2276 *
2277 * Device is not in dormant state.
2278 */
2279static inline void netif_dormant_off(struct net_device *dev)
2280{
2281        if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
2282                linkwatch_fire_event(dev);
2283}
2284
2285/**
2286 *      netif_dormant - test if carrier present
2287 *      @dev: network device
2288 *
2289 * Check if carrier is present on device
2290 */
2291static inline bool netif_dormant(const struct net_device *dev)
2292{
2293        return test_bit(__LINK_STATE_DORMANT, &dev->state);
2294}
2295
2296
2297/**
2298 *      netif_oper_up - test if device is operational
2299 *      @dev: network device
2300 *
2301 * Check if carrier is operational
2302 */
2303static inline bool netif_oper_up(const struct net_device *dev)
2304{
2305        return (dev->operstate == IF_OPER_UP ||
2306                dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
2307}
2308
2309/**
2310 *      netif_device_present - is device available or removed
2311 *      @dev: network device
2312 *
2313 * Check if device has not been removed from system.
2314 */
2315static inline bool netif_device_present(struct net_device *dev)
2316{
2317        return test_bit(__LINK_STATE_PRESENT, &dev->state);
2318}
2319
2320extern void netif_device_detach(struct net_device *dev);
2321
2322extern void netif_device_attach(struct net_device *dev);
2323
2324/*
2325 * Network interface message level settings
2326 */
2327
2328enum {
2329        NETIF_MSG_DRV           = 0x0001,
2330        NETIF_MSG_PROBE         = 0x0002,
2331        NETIF_MSG_LINK          = 0x0004,
2332        NETIF_MSG_TIMER         = 0x0008,
2333        NETIF_MSG_IFDOWN        = 0x0010,
2334        NETIF_MSG_IFUP          = 0x0020,
2335        NETIF_MSG_RX_ERR        = 0x0040,
2336        NETIF_MSG_TX_ERR        = 0x0080,
2337        NETIF_MSG_TX_QUEUED     = 0x0100,
2338        NETIF_MSG_INTR          = 0x0200,
2339        NETIF_MSG_TX_DONE       = 0x0400,
2340        NETIF_MSG_RX_STATUS     = 0x0800,
2341        NETIF_MSG_PKTDATA       = 0x1000,
2342        NETIF_MSG_HW            = 0x2000,
2343        NETIF_MSG_WOL           = 0x4000,
2344};
2345
2346#define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
2347#define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
2348#define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
2349#define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
2350#define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
2351#define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
2352#define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
2353#define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
2354#define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
2355#define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
2356#define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
2357#define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
2358#define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
2359#define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
2360#define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
2361
2362static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
2363{
2364        /* use default */
2365        if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
2366                return default_msg_enable_bits;
2367        if (debug_value == 0)   /* no output */
2368                return 0;
2369        /* set low N bits */
2370        return (1 << debug_value) - 1;
2371}
2372
2373static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
2374{
2375        spin_lock(&txq->_xmit_lock);
2376        txq->xmit_lock_owner = cpu;
2377}
2378
2379static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
2380{
2381        spin_lock_bh(&txq->_xmit_lock);
2382        txq->xmit_lock_owner = smp_processor_id();
2383}
2384
2385static inline bool __netif_tx_trylock(struct netdev_queue *txq)
2386{
2387        bool ok = spin_trylock(&txq->_xmit_lock);
2388        if (likely(ok))
2389                txq->xmit_lock_owner = smp_processor_id();
2390        return ok;
2391}
2392
2393static inline void __netif_tx_unlock(struct netdev_queue *txq)
2394{
2395        txq->xmit_lock_owner = -1;
2396        spin_unlock(&txq->_xmit_lock);
2397}
2398
2399static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
2400{
2401        txq->xmit_lock_owner = -1;
2402        spin_unlock_bh(&txq->_xmit_lock);
2403}
2404
2405static inline void txq_trans_update(struct netdev_queue *txq)
2406{
2407        if (txq->xmit_lock_owner != -1)
2408                txq->trans_start = jiffies;
2409}
2410
2411/**
2412 *      netif_tx_lock - grab network device transmit lock
2413 *      @dev: network device
2414 *
2415 * Get network device transmit lock
2416 */
2417static inline void netif_tx_lock(struct net_device *dev)
2418{
2419        unsigned int i;
2420        int cpu;
2421
2422        spin_lock(&dev->tx_global_lock);
2423        cpu = smp_processor_id();
2424        for (i = 0; i < dev->num_tx_queues; i++) {
2425                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2426
2427                /* We are the only thread of execution doing a
2428                 * freeze, but we have to grab the _xmit_lock in
2429                 * order to synchronize with threads which are in
2430                 * the ->hard_start_xmit() handler and already
2431                 * checked the frozen bit.
2432                 */
2433                __netif_tx_lock(txq, cpu);
2434                set_bit(__QUEUE_STATE_FROZEN, &txq->state);
2435                __netif_tx_unlock(txq);
2436        }
2437}
2438
2439static inline void netif_tx_lock_bh(struct net_device *dev)
2440{
2441        local_bh_disable();
2442        netif_tx_lock(dev);
2443}
2444
2445static inline void netif_tx_unlock(struct net_device *dev)
2446{
2447        unsigned int i;
2448
2449        for (i = 0; i < dev->num_tx_queues; i++) {
2450                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2451
2452                /* No need to grab the _xmit_lock here.  If the
2453                 * queue is not stopped for another reason, we
2454                 * force a schedule.
2455                 */
2456                clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
2457                netif_schedule_queue(txq);
2458        }
2459        spin_unlock(&dev->tx_global_lock);
2460}
2461
2462static inline void netif_tx_unlock_bh(struct net_device *dev)
2463{
2464        netif_tx_unlock(dev);
2465        local_bh_enable();
2466}
2467
2468#define HARD_TX_LOCK(dev, txq, cpu) {                   \
2469        if ((dev->features & NETIF_F_LLTX) == 0) {      \
2470                __netif_tx_lock(txq, cpu);              \
2471        }                                               \
2472}
2473
2474#define HARD_TX_UNLOCK(dev, txq) {                      \
2475        if ((dev->features & NETIF_F_LLTX) == 0) {      \
2476                __netif_tx_unlock(txq);                 \
2477        }                                               \
2478}
2479
2480static inline void netif_tx_disable(struct net_device *dev)
2481{
2482        unsigned int i;
2483        int cpu;
2484
2485        local_bh_disable();
2486        cpu = smp_processor_id();
2487        for (i = 0; i < dev->num_tx_queues; i++) {
2488                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2489
2490                __netif_tx_lock(txq, cpu);
2491                netif_tx_stop_queue(txq);
2492                __netif_tx_unlock(txq);
2493        }
2494        local_bh_enable();
2495}
2496
2497static inline void netif_addr_lock(struct net_device *dev)
2498{
2499        spin_lock(&dev->addr_list_lock);
2500}
2501
2502static inline void netif_addr_lock_nested(struct net_device *dev)
2503{
2504        spin_lock_nested(&dev->addr_list_lock, SINGLE_DEPTH_NESTING);
2505}
2506
2507static inline void netif_addr_lock_bh(struct net_device *dev)
2508{
2509        spin_lock_bh(&dev->addr_list_lock);
2510}
2511
2512static inline void netif_addr_unlock(struct net_device *dev)
2513{
2514        spin_unlock(&dev->addr_list_lock);
2515}
2516
2517static inline void netif_addr_unlock_bh(struct net_device *dev)
2518{
2519        spin_unlock_bh(&dev->addr_list_lock);
2520}
2521
2522/*
2523 * dev_addrs walker. Should be used only for read access. Call with
2524 * rcu_read_lock held.
2525 */
2526#define for_each_dev_addr(dev, ha) \
2527                list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
2528
2529/* These functions live elsewhere (drivers/net/net_init.c, but related) */
2530
2531extern void             ether_setup(struct net_device *dev);
2532
2533/* Support for loadable net-drivers */
2534extern struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
2535                                       void (*setup)(struct net_device *),
2536                                       unsigned int txqs, unsigned int rxqs);
2537#define alloc_netdev(sizeof_priv, name, setup) \
2538        alloc_netdev_mqs(sizeof_priv, name, setup, 1, 1)
2539
2540#define alloc_netdev_mq(sizeof_priv, name, setup, count) \
2541        alloc_netdev_mqs(sizeof_priv, name, setup, count, count)
2542
2543extern int              register_netdev(struct net_device *dev);
2544extern void             unregister_netdev(struct net_device *dev);
2545
2546/* General hardware address lists handling functions */
2547extern int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
2548                                  struct netdev_hw_addr_list *from_list,
2549                                  int addr_len, unsigned char addr_type);
2550extern void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
2551                                   struct netdev_hw_addr_list *from_list,
2552                                   int addr_len, unsigned char addr_type);
2553extern int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
2554                          struct netdev_hw_addr_list *from_list,
2555                          int addr_len);
2556extern void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
2557                             struct netdev_hw_addr_list *from_list,
2558                             int addr_len);
2559extern void __hw_addr_flush(struct netdev_hw_addr_list *list);
2560extern void __hw_addr_init(struct netdev_hw_addr_list *list);
2561
2562/* Functions used for device addresses handling */
2563extern int dev_addr_add(struct net_device *dev, unsigned char *addr,
2564                        unsigned char addr_type);
2565extern int dev_addr_del(struct net_device *dev, unsigned char *addr,
2566                        unsigned char addr_type);
2567extern int dev_addr_add_multiple(struct net_device *to_dev,
2568                                 struct net_device *from_dev,
2569                                 unsigned char addr_type);
2570extern int dev_addr_del_multiple(struct net_device *to_dev,
2571                                 struct net_device *from_dev,
2572                                 unsigned char addr_type);
2573extern void dev_addr_flush(struct net_device *dev);
2574extern int dev_addr_init(struct net_device *dev);
2575
2576/* Functions used for unicast addresses handling */
2577extern int dev_uc_add(struct net_device *dev, unsigned char *addr);
2578extern int dev_uc_add_excl(struct net_device *dev, unsigned char *addr);
2579extern int dev_uc_del(struct net_device *dev, unsigned char *addr);
2580extern int dev_uc_sync(struct net_device *to, struct net_device *from);
2581extern void dev_uc_unsync(struct net_device *to, struct net_device *from);
2582extern void dev_uc_flush(struct net_device *dev);
2583extern void dev_uc_init(struct net_device *dev);
2584
2585/* Functions used for multicast addresses handling */
2586extern int dev_mc_add(struct net_device *dev, unsigned char *addr);
2587extern int dev_mc_add_global(struct net_device *dev, unsigned char *addr);
2588extern int dev_mc_add_excl(struct net_device *dev, unsigned char *addr);
2589extern int dev_mc_del(struct net_device *dev, unsigned char *addr);
2590extern int dev_mc_del_global(struct net_device *dev, unsigned char *addr);
2591extern int dev_mc_sync(struct net_device *to, struct net_device *from);
2592extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
2593extern void dev_mc_flush(struct net_device *dev);
2594extern void dev_mc_init(struct net_device *dev);
2595
2596/* Functions used for secondary unicast and multicast support */
2597extern void             dev_set_rx_mode(struct net_device *dev);
2598extern void             __dev_set_rx_mode(struct net_device *dev);
2599extern int              dev_set_promiscuity(struct net_device *dev, int inc);
2600extern int              dev_set_allmulti(struct net_device *dev, int inc);
2601extern void             netdev_state_change(struct net_device *dev);
2602extern int              netdev_bonding_change(struct net_device *dev,
2603                                              unsigned long event);
2604extern void             netdev_features_change(struct net_device *dev);
2605/* Load a device via the kmod */
2606extern void             dev_load(struct net *net, const char *name);
2607extern void             dev_mcast_init(void);
2608extern struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
2609                                               struct rtnl_link_stats64 *storage);
2610extern void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
2611                                    const struct net_device_stats *netdev_stats);
2612
2613extern int              netdev_max_backlog;
2614extern int              netdev_tstamp_prequeue;
2615extern int              weight_p;
2616extern int              bpf_jit_enable;
2617extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
2618extern int netdev_set_bond_master(struct net_device *dev,
2619                                  struct net_device *master);
2620extern int skb_checksum_help(struct sk_buff *skb);
2621extern struct sk_buff *skb_gso_segment(struct sk_buff *skb,
2622        netdev_features_t features);
2623#ifdef CONFIG_BUG
2624extern void netdev_rx_csum_fault(struct net_device *dev);
2625#else
2626static inline void netdev_rx_csum_fault(struct net_device *dev)
2627{
2628}
2629#endif
2630/* rx skb timestamps */
2631extern void             net_enable_timestamp(void);
2632extern void             net_disable_timestamp(void);
2633
2634#ifdef CONFIG_PROC_FS
2635extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
2636extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
2637extern void dev_seq_stop(struct seq_file *seq, void *v);
2638#endif
2639
2640extern int netdev_class_create_file(struct class_attribute *class_attr);
2641extern void netdev_class_remove_file(struct class_attribute *class_attr);
2642
2643extern struct kobj_ns_type_operations net_ns_type_operations;
2644
2645extern const char *netdev_drivername(const struct net_device *dev);
2646
2647extern void linkwatch_run_queue(void);
2648
2649static inline netdev_features_t netdev_get_wanted_features(
2650        struct net_device *dev)
2651{
2652        return (dev->features & ~dev->hw_features) | dev->wanted_features;
2653}
2654netdev_features_t netdev_increment_features(netdev_features_t all,
2655        netdev_features_t one, netdev_features_t mask);
2656int __netdev_update_features(struct net_device *dev);
2657void netdev_update_features(struct net_device *dev);
2658void netdev_change_features(struct net_device *dev);
2659
2660void netif_stacked_transfer_operstate(const struct net_device *rootdev,
2661                                        struct net_device *dev);
2662
2663netdev_features_t netif_skb_features(struct sk_buff *skb);
2664
2665static inline bool net_gso_ok(netdev_features_t features, int gso_type)
2666{
2667        netdev_features_t feature = gso_type << NETIF_F_GSO_SHIFT;
2668
2669        /* check flags correspondence */
2670        BUILD_BUG_ON(SKB_GSO_TCPV4   != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT));
2671        BUILD_BUG_ON(SKB_GSO_UDP     != (NETIF_F_UFO >> NETIF_F_GSO_SHIFT));
2672        BUILD_BUG_ON(SKB_GSO_DODGY   != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT));
2673        BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT));
2674        BUILD_BUG_ON(SKB_GSO_TCPV6   != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT));
2675        BUILD_BUG_ON(SKB_GSO_FCOE    != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT));
2676
2677        return (features & feature) == feature;
2678}
2679
2680static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
2681{
2682        return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
2683               (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
2684}
2685
2686static inline bool netif_needs_gso(struct sk_buff *skb,
2687                                   netdev_features_t features)
2688{
2689        return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
2690                unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
2691                         (skb->ip_summed != CHECKSUM_UNNECESSARY)));
2692}
2693
2694static inline void netif_set_gso_max_size(struct net_device *dev,
2695                                          unsigned int size)
2696{
2697        dev->gso_max_size = size;
2698}
2699
2700static inline bool netif_is_bond_slave(struct net_device *dev)
2701{
2702        return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
2703}
2704
2705static inline bool netif_supports_nofcs(struct net_device *dev)
2706{
2707        return dev->priv_flags & IFF_SUPP_NOFCS;
2708}
2709
2710extern struct pernet_operations __net_initdata loopback_net_ops;
2711
2712/* Logging, debugging and troubleshooting/diagnostic helpers. */
2713
2714/* netdev_printk helpers, similar to dev_printk */
2715
2716static inline const char *netdev_name(const struct net_device *dev)
2717{
2718        if (dev->reg_state != NETREG_REGISTERED)
2719                return "(unregistered net_device)";
2720        return dev->name;
2721}
2722
2723extern int __netdev_printk(const char *level, const struct net_device *dev,
2724                        struct va_format *vaf);
2725
2726extern __printf(3, 4)
2727int netdev_printk(const char *level, const struct net_device *dev,
2728                  const char *format, ...);
2729extern __printf(2, 3)
2730int netdev_emerg(const struct net_device *dev, const char *format, ...);
2731extern __printf(2, 3)
2732int netdev_alert(const struct net_device *dev, const char *format, ...);
2733extern __printf(2, 3)
2734int netdev_crit(const struct net_device *dev, const char *format, ...);
2735extern __printf(2, 3)
2736int netdev_err(const struct net_device *dev, const char *format, ...);
2737extern __printf(2, 3)
2738int netdev_warn(const struct net_device *dev, const char *format, ...);
2739extern __printf(2, 3)
2740int netdev_notice(const struct net_device *dev, const char *format, ...);
2741extern __printf(2, 3)
2742int netdev_info(const struct net_device *dev, const char *format, ...);
2743
2744#define MODULE_ALIAS_NETDEV(device) \
2745        MODULE_ALIAS("netdev-" device)
2746
2747#if defined(CONFIG_DYNAMIC_DEBUG)
2748#define netdev_dbg(__dev, format, args...)                      \
2749do {                                                            \
2750        dynamic_netdev_dbg(__dev, format, ##args);              \
2751} while (0)
2752#elif defined(DEBUG)
2753#define netdev_dbg(__dev, format, args...)                      \
2754        netdev_printk(KERN_DEBUG, __dev, format, ##args)
2755#else
2756#define netdev_dbg(__dev, format, args...)                      \
2757({                                                              \
2758        if (0)                                                  \
2759                netdev_printk(KERN_DEBUG, __dev, format, ##args); \
2760        0;                                                      \
2761})
2762#endif
2763
2764#if defined(VERBOSE_DEBUG)
2765#define netdev_vdbg     netdev_dbg
2766#else
2767
2768#define netdev_vdbg(dev, format, args...)                       \
2769({                                                              \
2770        if (0)                                                  \
2771                netdev_printk(KERN_DEBUG, dev, format, ##args); \
2772        0;                                                      \
2773})
2774#endif
2775
2776/*
2777 * netdev_WARN() acts like dev_printk(), but with the key difference
2778 * of using a WARN/WARN_ON to get the message out, including the
2779 * file/line information and a backtrace.
2780 */
2781#define netdev_WARN(dev, format, args...)                       \
2782        WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args);
2783
2784/* netif printk helpers, similar to netdev_printk */
2785
2786#define netif_printk(priv, type, level, dev, fmt, args...)      \
2787do {                                                            \
2788        if (netif_msg_##type(priv))                             \
2789                netdev_printk(level, (dev), fmt, ##args);       \
2790} while (0)
2791
2792#define netif_level(level, priv, type, dev, fmt, args...)       \
2793do {                                                            \
2794        if (netif_msg_##type(priv))                             \
2795                netdev_##level(dev, fmt, ##args);               \
2796} while (0)
2797
2798#define netif_emerg(priv, type, dev, fmt, args...)              \
2799        netif_level(emerg, priv, type, dev, fmt, ##args)
2800#define netif_alert(priv, type, dev, fmt, args...)              \
2801        netif_level(alert, priv, type, dev, fmt, ##args)
2802#define netif_crit(priv, type, dev, fmt, args...)               \
2803        netif_level(crit, priv, type, dev, fmt, ##args)
2804#define netif_err(priv, type, dev, fmt, args...)                \
2805        netif_level(err, priv, type, dev, fmt, ##args)
2806#define netif_warn(priv, type, dev, fmt, args...)               \
2807        netif_level(warn, priv, type, dev, fmt, ##args)
2808#define netif_notice(priv, type, dev, fmt, args...)             \
2809        netif_level(notice, priv, type, dev, fmt, ##args)
2810#define netif_info(priv, type, dev, fmt, args...)               \
2811        netif_level(info, priv, type, dev, fmt, ##args)
2812
2813#if defined(CONFIG_DYNAMIC_DEBUG)
2814#define netif_dbg(priv, type, netdev, format, args...)          \
2815do {                                                            \
2816        if (netif_msg_##type(priv))                             \
2817                dynamic_netdev_dbg(netdev, format, ##args);     \
2818} while (0)
2819#elif defined(DEBUG)
2820#define netif_dbg(priv, type, dev, format, args...)             \
2821        netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
2822#else
2823#define netif_dbg(priv, type, dev, format, args...)                     \
2824({                                                                      \
2825        if (0)                                                          \
2826                netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2827        0;                                                              \
2828})
2829#endif
2830
2831#if defined(VERBOSE_DEBUG)
2832#define netif_vdbg      netif_dbg
2833#else
2834#define netif_vdbg(priv, type, dev, format, args...)            \
2835({                                                              \
2836        if (0)                                                  \
2837                netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2838        0;                                                      \
2839})
2840#endif
2841
2842#endif /* __KERNEL__ */
2843
2844#endif  /* _LINUX_NETDEVICE_H */
2845
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