linux/include/linux/netdevice.h
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   1/*
   2 * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3 *              operating system.  INET is implemented using the  BSD Socket
   4 *              interface as the means of communication with the user level.
   5 *
   6 *              Definitions for the Interfaces handler.
   7 *
   8 * Version:     @(#)dev.h       1.0.10  08/12/93
   9 *
  10 * Authors:     Ross Biro
  11 *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12 *              Corey Minyard <wf-rch!minyard@relay.EU.net>
  13 *              Donald J. Becker, <becker@cesdis.gsfc.nasa.gov>
  14 *              Alan Cox, <alan@lxorguk.ukuu.org.uk>
  15 *              Bjorn Ekwall. <bj0rn@blox.se>
  16 *              Pekka Riikonen <priikone@poseidon.pspt.fi>
  17 *
  18 *              This program is free software; you can redistribute it and/or
  19 *              modify it under the terms of the GNU General Public License
  20 *              as published by the Free Software Foundation; either version
  21 *              2 of the License, or (at your option) any later version.
  22 *
  23 *              Moved to /usr/include/linux for NET3
  24 */
  25#ifndef _LINUX_NETDEVICE_H
  26#define _LINUX_NETDEVICE_H
  27
  28#include <linux/pm_qos.h>
  29#include <linux/timer.h>
  30#include <linux/bug.h>
  31#include <linux/delay.h>
  32#include <linux/atomic.h>
  33#include <asm/cache.h>
  34#include <asm/byteorder.h>
  35
  36#include <linux/percpu.h>
  37#include <linux/rculist.h>
  38#include <linux/dmaengine.h>
  39#include <linux/workqueue.h>
  40#include <linux/dynamic_queue_limits.h>
  41
  42#include <linux/ethtool.h>
  43#include <net/net_namespace.h>
  44#include <net/dsa.h>
  45#ifdef CONFIG_DCB
  46#include <net/dcbnl.h>
  47#endif
  48#include <net/netprio_cgroup.h>
  49
  50#include <linux/netdev_features.h>
  51#include <linux/neighbour.h>
  52#include <uapi/linux/netdevice.h>
  53
  54struct netpoll_info;
  55struct device;
  56struct phy_device;
  57/* 802.11 specific */
  58struct wireless_dev;
  59                                        /* source back-compat hooks */
  60#define SET_ETHTOOL_OPS(netdev,ops) \
  61        ( (netdev)->ethtool_ops = (ops) )
  62
  63extern void netdev_set_default_ethtool_ops(struct net_device *dev,
  64                                           const struct ethtool_ops *ops);
  65
  66/* hardware address assignment types */
  67#define NET_ADDR_PERM           0       /* address is permanent (default) */
  68#define NET_ADDR_RANDOM         1       /* address is generated randomly */
  69#define NET_ADDR_STOLEN         2       /* address is stolen from other device */
  70#define NET_ADDR_SET            3       /* address is set using
  71                                         * dev_set_mac_address() */
  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/*
 137 *      Compute the worst case header length according to the protocols
 138 *      used.
 139 */
 140
 141#if defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
 142# if defined(CONFIG_MAC80211_MESH)
 143#  define LL_MAX_HEADER 128
 144# else
 145#  define LL_MAX_HEADER 96
 146# endif
 147#elif IS_ENABLED(CONFIG_TR)
 148# define LL_MAX_HEADER 48
 149#else
 150# define LL_MAX_HEADER 32
 151#endif
 152
 153#if !IS_ENABLED(CONFIG_NET_IPIP) && !IS_ENABLED(CONFIG_NET_IPGRE) && \
 154    !IS_ENABLED(CONFIG_IPV6_SIT) && !IS_ENABLED(CONFIG_IPV6_TUNNEL)
 155#define MAX_HEADER LL_MAX_HEADER
 156#else
 157#define MAX_HEADER (LL_MAX_HEADER + 48)
 158#endif
 159
 160/*
 161 *      Old network device statistics. Fields are native words
 162 *      (unsigned long) so they can be read and written atomically.
 163 */
 164
 165struct net_device_stats {
 166        unsigned long   rx_packets;
 167        unsigned long   tx_packets;
 168        unsigned long   rx_bytes;
 169        unsigned long   tx_bytes;
 170        unsigned long   rx_errors;
 171        unsigned long   tx_errors;
 172        unsigned long   rx_dropped;
 173        unsigned long   tx_dropped;
 174        unsigned long   multicast;
 175        unsigned long   collisions;
 176        unsigned long   rx_length_errors;
 177        unsigned long   rx_over_errors;
 178        unsigned long   rx_crc_errors;
 179        unsigned long   rx_frame_errors;
 180        unsigned long   rx_fifo_errors;
 181        unsigned long   rx_missed_errors;
 182        unsigned long   tx_aborted_errors;
 183        unsigned long   tx_carrier_errors;
 184        unsigned long   tx_fifo_errors;
 185        unsigned long   tx_heartbeat_errors;
 186        unsigned long   tx_window_errors;
 187        unsigned long   rx_compressed;
 188        unsigned long   tx_compressed;
 189};
 190
 191
 192#include <linux/cache.h>
 193#include <linux/skbuff.h>
 194
 195#ifdef CONFIG_RPS
 196#include <linux/static_key.h>
 197extern struct static_key rps_needed;
 198#endif
 199
 200struct neighbour;
 201struct neigh_parms;
 202struct sk_buff;
 203
 204struct netdev_hw_addr {
 205        struct list_head        list;
 206        unsigned char           addr[MAX_ADDR_LEN];
 207        unsigned char           type;
 208#define NETDEV_HW_ADDR_T_LAN            1
 209#define NETDEV_HW_ADDR_T_SAN            2
 210#define NETDEV_HW_ADDR_T_SLAVE          3
 211#define NETDEV_HW_ADDR_T_UNICAST        4
 212#define NETDEV_HW_ADDR_T_MULTICAST      5
 213        bool                    global_use;
 214        int                     refcount;
 215        int                     synced;
 216        struct rcu_head         rcu_head;
 217};
 218
 219struct netdev_hw_addr_list {
 220        struct list_head        list;
 221        int                     count;
 222};
 223
 224#define netdev_hw_addr_list_count(l) ((l)->count)
 225#define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0)
 226#define netdev_hw_addr_list_for_each(ha, l) \
 227        list_for_each_entry(ha, &(l)->list, list)
 228
 229#define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc)
 230#define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc)
 231#define netdev_for_each_uc_addr(ha, dev) \
 232        netdev_hw_addr_list_for_each(ha, &(dev)->uc)
 233
 234#define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc)
 235#define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc)
 236#define netdev_for_each_mc_addr(ha, dev) \
 237        netdev_hw_addr_list_for_each(ha, &(dev)->mc)
 238
 239struct hh_cache {
 240        u16             hh_len;
 241        u16             __pad;
 242        seqlock_t       hh_lock;
 243
 244        /* cached hardware header; allow for machine alignment needs.        */
 245#define HH_DATA_MOD     16
 246#define HH_DATA_OFF(__len) \
 247        (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
 248#define HH_DATA_ALIGN(__len) \
 249        (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
 250        unsigned long   hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
 251};
 252
 253/* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
 254 * Alternative is:
 255 *   dev->hard_header_len ? (dev->hard_header_len +
 256 *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
 257 *
 258 * We could use other alignment values, but we must maintain the
 259 * relationship HH alignment <= LL alignment.
 260 */
 261#define LL_RESERVED_SPACE(dev) \
 262        ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 263#define LL_RESERVED_SPACE_EXTRA(dev,extra) \
 264        ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 265
 266struct header_ops {
 267        int     (*create) (struct sk_buff *skb, struct net_device *dev,
 268                           unsigned short type, const void *daddr,
 269                           const void *saddr, unsigned int len);
 270        int     (*parse)(const struct sk_buff *skb, unsigned char *haddr);
 271        int     (*rebuild)(struct sk_buff *skb);
 272        int     (*cache)(const struct neighbour *neigh, struct hh_cache *hh, __be16 type);
 273        void    (*cache_update)(struct hh_cache *hh,
 274                                const struct net_device *dev,
 275                                const unsigned char *haddr);
 276};
 277
 278/* These flag bits are private to the generic network queueing
 279 * layer, they may not be explicitly referenced by any other
 280 * code.
 281 */
 282
 283enum netdev_state_t {
 284        __LINK_STATE_START,
 285        __LINK_STATE_PRESENT,
 286        __LINK_STATE_NOCARRIER,
 287        __LINK_STATE_LINKWATCH_PENDING,
 288        __LINK_STATE_DORMANT,
 289};
 290
 291
 292/*
 293 * This structure holds at boot time configured netdevice settings. They
 294 * are then used in the device probing.
 295 */
 296struct netdev_boot_setup {
 297        char name[IFNAMSIZ];
 298        struct ifmap map;
 299};
 300#define NETDEV_BOOT_SETUP_MAX 8
 301
 302extern int __init netdev_boot_setup(char *str);
 303
 304/*
 305 * Structure for NAPI scheduling similar to tasklet but with weighting
 306 */
 307struct napi_struct {
 308        /* The poll_list must only be managed by the entity which
 309         * changes the state of the NAPI_STATE_SCHED bit.  This means
 310         * whoever atomically sets that bit can add this napi_struct
 311         * to the per-cpu poll_list, and whoever clears that bit
 312         * can remove from the list right before clearing the bit.
 313         */
 314        struct list_head        poll_list;
 315
 316        unsigned long           state;
 317        int                     weight;
 318        unsigned int            gro_count;
 319        int                     (*poll)(struct napi_struct *, int);
 320#ifdef CONFIG_NETPOLL
 321        spinlock_t              poll_lock;
 322        int                     poll_owner;
 323#endif
 324        struct net_device       *dev;
 325        struct sk_buff          *gro_list;
 326        struct sk_buff          *skb;
 327        struct list_head        dev_list;
 328};
 329
 330enum {
 331        NAPI_STATE_SCHED,       /* Poll is scheduled */
 332        NAPI_STATE_DISABLE,     /* Disable pending */
 333        NAPI_STATE_NPSVC,       /* Netpoll - don't dequeue from poll_list */
 334};
 335
 336enum gro_result {
 337        GRO_MERGED,
 338        GRO_MERGED_FREE,
 339        GRO_HELD,
 340        GRO_NORMAL,
 341        GRO_DROP,
 342};
 343typedef enum gro_result gro_result_t;
 344
 345/*
 346 * enum rx_handler_result - Possible return values for rx_handlers.
 347 * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it
 348 * further.
 349 * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in
 350 * case skb->dev was changed by rx_handler.
 351 * @RX_HANDLER_EXACT: Force exact delivery, no wildcard.
 352 * @RX_HANDLER_PASS: Do nothing, passe the skb as if no rx_handler was called.
 353 *
 354 * rx_handlers are functions called from inside __netif_receive_skb(), to do
 355 * special processing of the skb, prior to delivery to protocol handlers.
 356 *
 357 * Currently, a net_device can only have a single rx_handler registered. Trying
 358 * to register a second rx_handler will return -EBUSY.
 359 *
 360 * To register a rx_handler on a net_device, use netdev_rx_handler_register().
 361 * To unregister a rx_handler on a net_device, use
 362 * netdev_rx_handler_unregister().
 363 *
 364 * Upon return, rx_handler is expected to tell __netif_receive_skb() what to
 365 * do with the skb.
 366 *
 367 * If the rx_handler consumed to skb in some way, it should return
 368 * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for
 369 * the skb to be delivered in some other ways.
 370 *
 371 * If the rx_handler changed skb->dev, to divert the skb to another
 372 * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the
 373 * new device will be called if it exists.
 374 *
 375 * If the rx_handler consider the skb should be ignored, it should return
 376 * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that
 377 * are registered on exact device (ptype->dev == skb->dev).
 378 *
 379 * If the rx_handler didn't changed skb->dev, but want the skb to be normally
 380 * delivered, it should return RX_HANDLER_PASS.
 381 *
 382 * A device without a registered rx_handler will behave as if rx_handler
 383 * returned RX_HANDLER_PASS.
 384 */
 385
 386enum rx_handler_result {
 387        RX_HANDLER_CONSUMED,
 388        RX_HANDLER_ANOTHER,
 389        RX_HANDLER_EXACT,
 390        RX_HANDLER_PASS,
 391};
 392typedef enum rx_handler_result rx_handler_result_t;
 393typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);
 394
 395extern void __napi_schedule(struct napi_struct *n);
 396
 397static inline bool napi_disable_pending(struct napi_struct *n)
 398{
 399        return test_bit(NAPI_STATE_DISABLE, &n->state);
 400}
 401
 402/**
 403 *      napi_schedule_prep - check if napi can be scheduled
 404 *      @n: napi context
 405 *
 406 * Test if NAPI routine is already running, and if not mark
 407 * it as running.  This is used as a condition variable
 408 * insure only one NAPI poll instance runs.  We also make
 409 * sure there is no pending NAPI disable.
 410 */
 411static inline bool napi_schedule_prep(struct napi_struct *n)
 412{
 413        return !napi_disable_pending(n) &&
 414                !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
 415}
 416
 417/**
 418 *      napi_schedule - schedule NAPI poll
 419 *      @n: napi context
 420 *
 421 * Schedule NAPI poll routine to be called if it is not already
 422 * running.
 423 */
 424static inline void napi_schedule(struct napi_struct *n)
 425{
 426        if (napi_schedule_prep(n))
 427                __napi_schedule(n);
 428}
 429
 430/* Try to reschedule poll. Called by dev->poll() after napi_complete().  */
 431static inline bool napi_reschedule(struct napi_struct *napi)
 432{
 433        if (napi_schedule_prep(napi)) {
 434                __napi_schedule(napi);
 435                return true;
 436        }
 437        return false;
 438}
 439
 440/**
 441 *      napi_complete - NAPI processing complete
 442 *      @n: napi context
 443 *
 444 * Mark NAPI processing as complete.
 445 */
 446extern void __napi_complete(struct napi_struct *n);
 447extern void napi_complete(struct napi_struct *n);
 448
 449/**
 450 *      napi_disable - prevent NAPI from scheduling
 451 *      @n: napi context
 452 *
 453 * Stop NAPI from being scheduled on this context.
 454 * Waits till any outstanding processing completes.
 455 */
 456static inline void napi_disable(struct napi_struct *n)
 457{
 458        set_bit(NAPI_STATE_DISABLE, &n->state);
 459        while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
 460                msleep(1);
 461        clear_bit(NAPI_STATE_DISABLE, &n->state);
 462}
 463
 464/**
 465 *      napi_enable - enable NAPI scheduling
 466 *      @n: napi context
 467 *
 468 * Resume NAPI from being scheduled on this context.
 469 * Must be paired with napi_disable.
 470 */
 471static inline void napi_enable(struct napi_struct *n)
 472{
 473        BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
 474        smp_mb__before_clear_bit();
 475        clear_bit(NAPI_STATE_SCHED, &n->state);
 476}
 477
 478#ifdef CONFIG_SMP
 479/**
 480 *      napi_synchronize - wait until NAPI is not running
 481 *      @n: napi context
 482 *
 483 * Wait until NAPI is done being scheduled on this context.
 484 * Waits till any outstanding processing completes but
 485 * does not disable future activations.
 486 */
 487static inline void napi_synchronize(const struct napi_struct *n)
 488{
 489        while (test_bit(NAPI_STATE_SCHED, &n->state))
 490                msleep(1);
 491}
 492#else
 493# define napi_synchronize(n)    barrier()
 494#endif
 495
 496enum netdev_queue_state_t {
 497        __QUEUE_STATE_DRV_XOFF,
 498        __QUEUE_STATE_STACK_XOFF,
 499        __QUEUE_STATE_FROZEN,
 500#define QUEUE_STATE_ANY_XOFF ((1 << __QUEUE_STATE_DRV_XOFF)             | \
 501                              (1 << __QUEUE_STATE_STACK_XOFF))
 502#define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF            | \
 503                                        (1 << __QUEUE_STATE_FROZEN))
 504};
 505/*
 506 * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue.  The
 507 * netif_tx_* functions below are used to manipulate this flag.  The
 508 * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit
 509 * queue independently.  The netif_xmit_*stopped functions below are called
 510 * to check if the queue has been stopped by the driver or stack (either
 511 * of the XOFF bits are set in the state).  Drivers should not need to call
 512 * netif_xmit*stopped functions, they should only be using netif_tx_*.
 513 */
 514
 515struct netdev_queue {
 516/*
 517 * read mostly part
 518 */
 519        struct net_device       *dev;
 520        struct Qdisc            *qdisc;
 521        struct Qdisc            *qdisc_sleeping;
 522#ifdef CONFIG_SYSFS
 523        struct kobject          kobj;
 524#endif
 525#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
 526        int                     numa_node;
 527#endif
 528/*
 529 * write mostly part
 530 */
 531        spinlock_t              _xmit_lock ____cacheline_aligned_in_smp;
 532        int                     xmit_lock_owner;
 533        /*
 534         * please use this field instead of dev->trans_start
 535         */
 536        unsigned long           trans_start;
 537
 538        /*
 539         * Number of TX timeouts for this queue
 540         * (/sys/class/net/DEV/Q/trans_timeout)
 541         */
 542        unsigned long           trans_timeout;
 543
 544        unsigned long           state;
 545
 546#ifdef CONFIG_BQL
 547        struct dql              dql;
 548#endif
 549} ____cacheline_aligned_in_smp;
 550
 551static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
 552{
 553#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
 554        return q->numa_node;
 555#else
 556        return NUMA_NO_NODE;
 557#endif
 558}
 559
 560static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node)
 561{
 562#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
 563        q->numa_node = node;
 564#endif
 565}
 566
 567#ifdef CONFIG_RPS
 568/*
 569 * This structure holds an RPS map which can be of variable length.  The
 570 * map is an array of CPUs.
 571 */
 572struct rps_map {
 573        unsigned int len;
 574        struct rcu_head rcu;
 575        u16 cpus[0];
 576};
 577#define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16)))
 578
 579/*
 580 * The rps_dev_flow structure contains the mapping of a flow to a CPU, the
 581 * tail pointer for that CPU's input queue at the time of last enqueue, and
 582 * a hardware filter index.
 583 */
 584struct rps_dev_flow {
 585        u16 cpu;
 586        u16 filter;
 587        unsigned int last_qtail;
 588};
 589#define RPS_NO_FILTER 0xffff
 590
 591/*
 592 * The rps_dev_flow_table structure contains a table of flow mappings.
 593 */
 594struct rps_dev_flow_table {
 595        unsigned int mask;
 596        struct rcu_head rcu;
 597        struct work_struct free_work;
 598        struct rps_dev_flow flows[0];
 599};
 600#define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
 601    ((_num) * sizeof(struct rps_dev_flow)))
 602
 603/*
 604 * The rps_sock_flow_table contains mappings of flows to the last CPU
 605 * on which they were processed by the application (set in recvmsg).
 606 */
 607struct rps_sock_flow_table {
 608        unsigned int mask;
 609        u16 ents[0];
 610};
 611#define RPS_SOCK_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_sock_flow_table) + \
 612    ((_num) * sizeof(u16)))
 613
 614#define RPS_NO_CPU 0xffff
 615
 616static inline void rps_record_sock_flow(struct rps_sock_flow_table *table,
 617                                        u32 hash)
 618{
 619        if (table && hash) {
 620                unsigned int cpu, index = hash & table->mask;
 621
 622                /* We only give a hint, preemption can change cpu under us */
 623                cpu = raw_smp_processor_id();
 624
 625                if (table->ents[index] != cpu)
 626                        table->ents[index] = cpu;
 627        }
 628}
 629
 630static inline void rps_reset_sock_flow(struct rps_sock_flow_table *table,
 631                                       u32 hash)
 632{
 633        if (table && hash)
 634                table->ents[hash & table->mask] = RPS_NO_CPU;
 635}
 636
 637extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;
 638
 639#ifdef CONFIG_RFS_ACCEL
 640extern bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
 641                                u32 flow_id, u16 filter_id);
 642#endif
 643
 644/* This structure contains an instance of an RX queue. */
 645struct netdev_rx_queue {
 646        struct rps_map __rcu            *rps_map;
 647        struct rps_dev_flow_table __rcu *rps_flow_table;
 648        struct kobject                  kobj;
 649        struct net_device               *dev;
 650} ____cacheline_aligned_in_smp;
 651#endif /* CONFIG_RPS */
 652
 653#ifdef CONFIG_XPS
 654/*
 655 * This structure holds an XPS map which can be of variable length.  The
 656 * map is an array of queues.
 657 */
 658struct xps_map {
 659        unsigned int len;
 660        unsigned int alloc_len;
 661        struct rcu_head rcu;
 662        u16 queues[0];
 663};
 664#define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16)))
 665#define XPS_MIN_MAP_ALLOC ((L1_CACHE_BYTES - sizeof(struct xps_map))    \
 666    / sizeof(u16))
 667
 668/*
 669 * This structure holds all XPS maps for device.  Maps are indexed by CPU.
 670 */
 671struct xps_dev_maps {
 672        struct rcu_head rcu;
 673        struct xps_map __rcu *cpu_map[0];
 674};
 675#define XPS_DEV_MAPS_SIZE (sizeof(struct xps_dev_maps) +                \
 676    (nr_cpu_ids * sizeof(struct xps_map *)))
 677#endif /* CONFIG_XPS */
 678
 679#define TC_MAX_QUEUE    16
 680#define TC_BITMASK      15
 681/* HW offloaded queuing disciplines txq count and offset maps */
 682struct netdev_tc_txq {
 683        u16 count;
 684        u16 offset;
 685};
 686
 687#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 688/*
 689 * This structure is to hold information about the device
 690 * configured to run FCoE protocol stack.
 691 */
 692struct netdev_fcoe_hbainfo {
 693        char    manufacturer[64];
 694        char    serial_number[64];
 695        char    hardware_version[64];
 696        char    driver_version[64];
 697        char    optionrom_version[64];
 698        char    firmware_version[64];
 699        char    model[256];
 700        char    model_description[256];
 701};
 702#endif
 703
 704/*
 705 * This structure defines the management hooks for network devices.
 706 * The following hooks can be defined; unless noted otherwise, they are
 707 * optional and can be filled with a null pointer.
 708 *
 709 * int (*ndo_init)(struct net_device *dev);
 710 *     This function is called once when network device is registered.
 711 *     The network device can use this to any late stage initializaton
 712 *     or semantic validattion. It can fail with an error code which will
 713 *     be propogated back to register_netdev
 714 *
 715 * void (*ndo_uninit)(struct net_device *dev);
 716 *     This function is called when device is unregistered or when registration
 717 *     fails. It is not called if init fails.
 718 *
 719 * int (*ndo_open)(struct net_device *dev);
 720 *     This function is called when network device transistions to the up
 721 *     state.
 722 *
 723 * int (*ndo_stop)(struct net_device *dev);
 724 *     This function is called when network device transistions to the down
 725 *     state.
 726 *
 727 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
 728 *                               struct net_device *dev);
 729 *      Called when a packet needs to be transmitted.
 730 *      Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
 731 *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
 732 *      Required can not be NULL.
 733 *
 734 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
 735 *      Called to decide which queue to when device supports multiple
 736 *      transmit queues.
 737 *
 738 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
 739 *      This function is called to allow device receiver to make
 740 *      changes to configuration when multicast or promiscious is enabled.
 741 *
 742 * void (*ndo_set_rx_mode)(struct net_device *dev);
 743 *      This function is called device changes address list filtering.
 744 *      If driver handles unicast address filtering, it should set
 745 *      IFF_UNICAST_FLT to its priv_flags.
 746 *
 747 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
 748 *      This function  is called when the Media Access Control address
 749 *      needs to be changed. If this interface is not defined, the
 750 *      mac address can not be changed.
 751 *
 752 * int (*ndo_validate_addr)(struct net_device *dev);
 753 *      Test if Media Access Control address is valid for the device.
 754 *
 755 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
 756 *      Called when a user request an ioctl which can't be handled by
 757 *      the generic interface code. If not defined ioctl's return
 758 *      not supported error code.
 759 *
 760 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
 761 *      Used to set network devices bus interface parameters. This interface
 762 *      is retained for legacy reason, new devices should use the bus
 763 *      interface (PCI) for low level management.
 764 *
 765 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
 766 *      Called when a user wants to change the Maximum Transfer Unit
 767 *      of a device. If not defined, any request to change MTU will
 768 *      will return an error.
 769 *
 770 * void (*ndo_tx_timeout)(struct net_device *dev);
 771 *      Callback uses when the transmitter has not made any progress
 772 *      for dev->watchdog ticks.
 773 *
 774 * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
 775 *                      struct rtnl_link_stats64 *storage);
 776 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
 777 *      Called when a user wants to get the network device usage
 778 *      statistics. Drivers must do one of the following:
 779 *      1. Define @ndo_get_stats64 to fill in a zero-initialised
 780 *         rtnl_link_stats64 structure passed by the caller.
 781 *      2. Define @ndo_get_stats to update a net_device_stats structure
 782 *         (which should normally be dev->stats) and return a pointer to
 783 *         it. The structure may be changed asynchronously only if each
 784 *         field is written atomically.
 785 *      3. Update dev->stats asynchronously and atomically, and define
 786 *         neither operation.
 787 *
 788 * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid);
 789 *      If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
 790 *      this function is called when a VLAN id is registered.
 791 *
 792 * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
 793 *      If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
 794 *      this function is called when a VLAN id is unregistered.
 795 *
 796 * void (*ndo_poll_controller)(struct net_device *dev);
 797 *
 798 *      SR-IOV management functions.
 799 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
 800 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos);
 801 * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate);
 802 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
 803 * int (*ndo_get_vf_config)(struct net_device *dev,
 804 *                          int vf, struct ifla_vf_info *ivf);
 805 * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
 806 *                        struct nlattr *port[]);
 807 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
 808 * int (*ndo_setup_tc)(struct net_device *dev, u8 tc)
 809 *      Called to setup 'tc' number of traffic classes in the net device. This
 810 *      is always called from the stack with the rtnl lock held and netif tx
 811 *      queues stopped. This allows the netdevice to perform queue management
 812 *      safely.
 813 *
 814 *      Fiber Channel over Ethernet (FCoE) offload functions.
 815 * int (*ndo_fcoe_enable)(struct net_device *dev);
 816 *      Called when the FCoE protocol stack wants to start using LLD for FCoE
 817 *      so the underlying device can perform whatever needed configuration or
 818 *      initialization to support acceleration of FCoE traffic.
 819 *
 820 * int (*ndo_fcoe_disable)(struct net_device *dev);
 821 *      Called when the FCoE protocol stack wants to stop using LLD for FCoE
 822 *      so the underlying device can perform whatever needed clean-ups to
 823 *      stop supporting acceleration of FCoE traffic.
 824 *
 825 * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid,
 826 *                           struct scatterlist *sgl, unsigned int sgc);
 827 *      Called when the FCoE Initiator wants to initialize an I/O that
 828 *      is a possible candidate for Direct Data Placement (DDP). The LLD can
 829 *      perform necessary setup and returns 1 to indicate the device is set up
 830 *      successfully to perform DDP on this I/O, otherwise this returns 0.
 831 *
 832 * int (*ndo_fcoe_ddp_done)(struct net_device *dev,  u16 xid);
 833 *      Called when the FCoE Initiator/Target is done with the DDPed I/O as
 834 *      indicated by the FC exchange id 'xid', so the underlying device can
 835 *      clean up and reuse resources for later DDP requests.
 836 *
 837 * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid,
 838 *                            struct scatterlist *sgl, unsigned int sgc);
 839 *      Called when the FCoE Target wants to initialize an I/O that
 840 *      is a possible candidate for Direct Data Placement (DDP). The LLD can
 841 *      perform necessary setup and returns 1 to indicate the device is set up
 842 *      successfully to perform DDP on this I/O, otherwise this returns 0.
 843 *
 844 * int (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
 845 *                             struct netdev_fcoe_hbainfo *hbainfo);
 846 *      Called when the FCoE Protocol stack wants information on the underlying
 847 *      device. This information is utilized by the FCoE protocol stack to
 848 *      register attributes with Fiber Channel management service as per the
 849 *      FC-GS Fabric Device Management Information(FDMI) specification.
 850 *
 851 * int (*ndo_fcoe_get_wwn)(struct net_device *dev, u64 *wwn, int type);
 852 *      Called when the underlying device wants to override default World Wide
 853 *      Name (WWN) generation mechanism in FCoE protocol stack to pass its own
 854 *      World Wide Port Name (WWPN) or World Wide Node Name (WWNN) to the FCoE
 855 *      protocol stack to use.
 856 *
 857 *      RFS acceleration.
 858 * int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb,
 859 *                          u16 rxq_index, u32 flow_id);
 860 *      Set hardware filter for RFS.  rxq_index is the target queue index;
 861 *      flow_id is a flow ID to be passed to rps_may_expire_flow() later.
 862 *      Return the filter ID on success, or a negative error code.
 863 *
 864 *      Slave management functions (for bridge, bonding, etc).
 865 * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev);
 866 *      Called to make another netdev an underling.
 867 *
 868 * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev);
 869 *      Called to release previously enslaved netdev.
 870 *
 871 *      Feature/offload setting functions.
 872 * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
 873 *              netdev_features_t features);
 874 *      Adjusts the requested feature flags according to device-specific
 875 *      constraints, and returns the resulting flags. Must not modify
 876 *      the device state.
 877 *
 878 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
 879 *      Called to update device configuration to new features. Passed
 880 *      feature set might be less than what was returned by ndo_fix_features()).
 881 *      Must return >0 or -errno if it changed dev->features itself.
 882 *
 883 * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[],
 884 *                    struct net_device *dev,
 885 *                    const unsigned char *addr, u16 flags)
 886 *      Adds an FDB entry to dev for addr.
 887 * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[],
 888 *                    struct net_device *dev,
 889 *                    const unsigned char *addr)
 890 *      Deletes the FDB entry from dev coresponding to addr.
 891 * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb,
 892 *                     struct net_device *dev, int idx)
 893 *      Used to add FDB entries to dump requests. Implementers should add
 894 *      entries to skb and update idx with the number of entries.
 895 *
 896 * int (*ndo_bridge_setlink)(struct net_device *dev, struct nlmsghdr *nlh)
 897 * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq,
 898 *                           struct net_device *dev, u32 filter_mask)
 899 *
 900 * int (*ndo_change_carrier)(struct net_device *dev, bool new_carrier);
 901 *      Called to change device carrier. Soft-devices (like dummy, team, etc)
 902 *      which do not represent real hardware may define this to allow their
 903 *      userspace components to manage their virtual carrier state. Devices
 904 *      that determine carrier state from physical hardware properties (eg
 905 *      network cables) or protocol-dependent mechanisms (eg
 906 *      USB_CDC_NOTIFY_NETWORK_CONNECTION) should NOT implement this function.
 907 */
 908struct net_device_ops {
 909        int                     (*ndo_init)(struct net_device *dev);
 910        void                    (*ndo_uninit)(struct net_device *dev);
 911        int                     (*ndo_open)(struct net_device *dev);
 912        int                     (*ndo_stop)(struct net_device *dev);
 913        netdev_tx_t             (*ndo_start_xmit) (struct sk_buff *skb,
 914                                                   struct net_device *dev);
 915        u16                     (*ndo_select_queue)(struct net_device *dev,
 916                                                    struct sk_buff *skb);
 917        void                    (*ndo_change_rx_flags)(struct net_device *dev,
 918                                                       int flags);
 919        void                    (*ndo_set_rx_mode)(struct net_device *dev);
 920        int                     (*ndo_set_mac_address)(struct net_device *dev,
 921                                                       void *addr);
 922        int                     (*ndo_validate_addr)(struct net_device *dev);
 923        int                     (*ndo_do_ioctl)(struct net_device *dev,
 924                                                struct ifreq *ifr, int cmd);
 925        int                     (*ndo_set_config)(struct net_device *dev,
 926                                                  struct ifmap *map);
 927        int                     (*ndo_change_mtu)(struct net_device *dev,
 928                                                  int new_mtu);
 929        int                     (*ndo_neigh_setup)(struct net_device *dev,
 930                                                   struct neigh_parms *);
 931        void                    (*ndo_tx_timeout) (struct net_device *dev);
 932
 933        struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
 934                                                     struct rtnl_link_stats64 *storage);
 935        struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
 936
 937        int                     (*ndo_vlan_rx_add_vid)(struct net_device *dev,
 938                                                       unsigned short vid);
 939        int                     (*ndo_vlan_rx_kill_vid)(struct net_device *dev,
 940                                                        unsigned short vid);
 941#ifdef CONFIG_NET_POLL_CONTROLLER
 942        void                    (*ndo_poll_controller)(struct net_device *dev);
 943        int                     (*ndo_netpoll_setup)(struct net_device *dev,
 944                                                     struct netpoll_info *info,
 945                                                     gfp_t gfp);
 946        void                    (*ndo_netpoll_cleanup)(struct net_device *dev);
 947#endif
 948        int                     (*ndo_set_vf_mac)(struct net_device *dev,
 949                                                  int queue, u8 *mac);
 950        int                     (*ndo_set_vf_vlan)(struct net_device *dev,
 951                                                   int queue, u16 vlan, u8 qos);
 952        int                     (*ndo_set_vf_tx_rate)(struct net_device *dev,
 953                                                      int vf, int rate);
 954        int                     (*ndo_set_vf_spoofchk)(struct net_device *dev,
 955                                                       int vf, bool setting);
 956        int                     (*ndo_get_vf_config)(struct net_device *dev,
 957                                                     int vf,
 958                                                     struct ifla_vf_info *ivf);
 959        int                     (*ndo_set_vf_port)(struct net_device *dev,
 960                                                   int vf,
 961                                                   struct nlattr *port[]);
 962        int                     (*ndo_get_vf_port)(struct net_device *dev,
 963                                                   int vf, struct sk_buff *skb);
 964        int                     (*ndo_setup_tc)(struct net_device *dev, u8 tc);
 965#if IS_ENABLED(CONFIG_FCOE)
 966        int                     (*ndo_fcoe_enable)(struct net_device *dev);
 967        int                     (*ndo_fcoe_disable)(struct net_device *dev);
 968        int                     (*ndo_fcoe_ddp_setup)(struct net_device *dev,
 969                                                      u16 xid,
 970                                                      struct scatterlist *sgl,
 971                                                      unsigned int sgc);
 972        int                     (*ndo_fcoe_ddp_done)(struct net_device *dev,
 973                                                     u16 xid);
 974        int                     (*ndo_fcoe_ddp_target)(struct net_device *dev,
 975                                                       u16 xid,
 976                                                       struct scatterlist *sgl,
 977                                                       unsigned int sgc);
 978        int                     (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
 979                                                        struct netdev_fcoe_hbainfo *hbainfo);
 980#endif
 981
 982#if IS_ENABLED(CONFIG_LIBFCOE)
 983#define NETDEV_FCOE_WWNN 0
 984#define NETDEV_FCOE_WWPN 1
 985        int                     (*ndo_fcoe_get_wwn)(struct net_device *dev,
 986                                                    u64 *wwn, int type);
 987#endif
 988
 989#ifdef CONFIG_RFS_ACCEL
 990        int                     (*ndo_rx_flow_steer)(struct net_device *dev,
 991                                                     const struct sk_buff *skb,
 992                                                     u16 rxq_index,
 993                                                     u32 flow_id);
 994#endif
 995        int                     (*ndo_add_slave)(struct net_device *dev,
 996                                                 struct net_device *slave_dev);
 997        int                     (*ndo_del_slave)(struct net_device *dev,
 998                                                 struct net_device *slave_dev);
 999        netdev_features_t       (*ndo_fix_features)(struct net_device *dev,
1000                                                    netdev_features_t features);
1001        int                     (*ndo_set_features)(struct net_device *dev,
1002                                                    netdev_features_t features);
1003        int                     (*ndo_neigh_construct)(struct neighbour *n);
1004        void                    (*ndo_neigh_destroy)(struct neighbour *n);
1005
1006        int                     (*ndo_fdb_add)(struct ndmsg *ndm,
1007                                               struct nlattr *tb[],
1008                                               struct net_device *dev,
1009                                               const unsigned char *addr,
1010                                               u16 flags);
1011        int                     (*ndo_fdb_del)(struct ndmsg *ndm,
1012                                               struct nlattr *tb[],
1013                                               struct net_device *dev,
1014                                               const unsigned char *addr);
1015        int                     (*ndo_fdb_dump)(struct sk_buff *skb,
1016                                                struct netlink_callback *cb,
1017                                                struct net_device *dev,
1018                                                int idx);
1019
1020        int                     (*ndo_bridge_setlink)(struct net_device *dev,
1021                                                      struct nlmsghdr *nlh);
1022        int                     (*ndo_bridge_getlink)(struct sk_buff *skb,
1023                                                      u32 pid, u32 seq,
1024                                                      struct net_device *dev,
1025                                                      u32 filter_mask);
1026        int                     (*ndo_bridge_dellink)(struct net_device *dev,
1027                                                      struct nlmsghdr *nlh);
1028        int                     (*ndo_change_carrier)(struct net_device *dev,
1029                                                      bool new_carrier);
1030};
1031
1032/*
1033 *      The DEVICE structure.
1034 *      Actually, this whole structure is a big mistake.  It mixes I/O
1035 *      data with strictly "high-level" data, and it has to know about
1036 *      almost every data structure used in the INET module.
1037 *
1038 *      FIXME: cleanup struct net_device such that network protocol info
1039 *      moves out.
1040 */
1041
1042struct net_device {
1043
1044        /*
1045         * This is the first field of the "visible" part of this structure
1046         * (i.e. as seen by users in the "Space.c" file).  It is the name
1047         * of the interface.
1048         */
1049        char                    name[IFNAMSIZ];
1050
1051        /* device name hash chain, please keep it close to name[] */
1052        struct hlist_node       name_hlist;
1053
1054        /* snmp alias */
1055        char                    *ifalias;
1056
1057        /*
1058         *      I/O specific fields
1059         *      FIXME: Merge these and struct ifmap into one
1060         */
1061        unsigned long           mem_end;        /* shared mem end       */
1062        unsigned long           mem_start;      /* shared mem start     */
1063        unsigned long           base_addr;      /* device I/O address   */
1064        unsigned int            irq;            /* device IRQ number    */
1065
1066        /*
1067         *      Some hardware also needs these fields, but they are not
1068         *      part of the usual set specified in Space.c.
1069         */
1070
1071        unsigned long           state;
1072
1073        struct list_head        dev_list;
1074        struct list_head        napi_list;
1075        struct list_head        unreg_list;
1076
1077        /* currently active device features */
1078        netdev_features_t       features;
1079        /* user-changeable features */
1080        netdev_features_t       hw_features;
1081        /* user-requested features */
1082        netdev_features_t       wanted_features;
1083        /* mask of features inheritable by VLAN devices */
1084        netdev_features_t       vlan_features;
1085        /* mask of features inherited by encapsulating devices
1086         * This field indicates what encapsulation offloads
1087         * the hardware is capable of doing, and drivers will
1088         * need to set them appropriately.
1089         */
1090        netdev_features_t       hw_enc_features;
1091
1092        /* Interface index. Unique device identifier    */
1093        int                     ifindex;
1094        int                     iflink;
1095
1096        struct net_device_stats stats;
1097        atomic_long_t           rx_dropped; /* dropped packets by core network
1098                                             * Do not use this in drivers.
1099                                             */
1100
1101#ifdef CONFIG_WIRELESS_EXT
1102        /* List of functions to handle Wireless Extensions (instead of ioctl).
1103         * See <net/iw_handler.h> for details. Jean II */
1104        const struct iw_handler_def *   wireless_handlers;
1105        /* Instance data managed by the core of Wireless Extensions. */
1106        struct iw_public_data * wireless_data;
1107#endif
1108        /* Management operations */
1109        const struct net_device_ops *netdev_ops;
1110        const struct ethtool_ops *ethtool_ops;
1111
1112        /* Hardware header description */
1113        const struct header_ops *header_ops;
1114
1115        unsigned int            flags;  /* interface flags (a la BSD)   */
1116        unsigned int            priv_flags; /* Like 'flags' but invisible to userspace.
1117                                             * See if.h for definitions. */
1118        unsigned short          gflags;
1119        unsigned short          padded; /* How much padding added by alloc_netdev() */
1120
1121        unsigned char           operstate; /* RFC2863 operstate */
1122        unsigned char           link_mode; /* mapping policy to operstate */
1123
1124        unsigned char           if_port;        /* Selectable AUI, TP,..*/
1125        unsigned char           dma;            /* DMA channel          */
1126
1127        unsigned int            mtu;    /* interface MTU value          */
1128        unsigned short          type;   /* interface hardware type      */
1129        unsigned short          hard_header_len;        /* hardware hdr length  */
1130
1131        /* extra head- and tailroom the hardware may need, but not in all cases
1132         * can this be guaranteed, especially tailroom. Some cases also use
1133         * LL_MAX_HEADER instead to allocate the skb.
1134         */
1135        unsigned short          needed_headroom;
1136        unsigned short          needed_tailroom;
1137
1138        /* Interface address info. */
1139        unsigned char           perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
1140        unsigned char           addr_assign_type; /* hw address assignment type */
1141        unsigned char           addr_len;       /* hardware address length      */
1142        unsigned char           neigh_priv_len;
1143        unsigned short          dev_id;         /* for shared network cards */
1144
1145        spinlock_t              addr_list_lock;
1146        struct netdev_hw_addr_list      uc;     /* Unicast mac addresses */
1147        struct netdev_hw_addr_list      mc;     /* Multicast mac addresses */
1148        bool                    uc_promisc;
1149        unsigned int            promiscuity;
1150        unsigned int            allmulti;
1151
1152
1153        /* Protocol specific pointers */
1154
1155#if IS_ENABLED(CONFIG_VLAN_8021Q)
1156        struct vlan_info __rcu  *vlan_info;     /* VLAN info */
1157#endif
1158#if IS_ENABLED(CONFIG_NET_DSA)
1159        struct dsa_switch_tree  *dsa_ptr;       /* dsa specific data */
1160#endif
1161        void                    *atalk_ptr;     /* AppleTalk link       */
1162        struct in_device __rcu  *ip_ptr;        /* IPv4 specific data   */
1163        struct dn_dev __rcu     *dn_ptr;        /* DECnet specific data */
1164        struct inet6_dev __rcu  *ip6_ptr;       /* IPv6 specific data */
1165        void                    *ax25_ptr;      /* AX.25 specific data */
1166        struct wireless_dev     *ieee80211_ptr; /* IEEE 802.11 specific data,
1167                                                   assign before registering */
1168
1169/*
1170 * Cache lines mostly used on receive path (including eth_type_trans())
1171 */
1172        unsigned long           last_rx;        /* Time of last Rx
1173                                                 * This should not be set in
1174                                                 * drivers, unless really needed,
1175                                                 * because network stack (bonding)
1176                                                 * use it if/when necessary, to
1177                                                 * avoid dirtying this cache line.
1178                                                 */
1179
1180        struct list_head        upper_dev_list; /* List of upper devices */
1181
1182        /* Interface address info used in eth_type_trans() */
1183        unsigned char           *dev_addr;      /* hw address, (before bcast
1184                                                   because most packets are
1185                                                   unicast) */
1186
1187        struct netdev_hw_addr_list      dev_addrs; /* list of device
1188                                                      hw addresses */
1189
1190        unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
1191
1192#ifdef CONFIG_SYSFS
1193        struct kset             *queues_kset;
1194#endif
1195
1196#ifdef CONFIG_RPS
1197        struct netdev_rx_queue  *_rx;
1198
1199        /* Number of RX queues allocated at register_netdev() time */
1200        unsigned int            num_rx_queues;
1201
1202        /* Number of RX queues currently active in device */
1203        unsigned int            real_num_rx_queues;
1204
1205#ifdef CONFIG_RFS_ACCEL
1206        /* CPU reverse-mapping for RX completion interrupts, indexed
1207         * by RX queue number.  Assigned by driver.  This must only be
1208         * set if the ndo_rx_flow_steer operation is defined. */
1209        struct cpu_rmap         *rx_cpu_rmap;
1210#endif
1211#endif
1212
1213        rx_handler_func_t __rcu *rx_handler;
1214        void __rcu              *rx_handler_data;
1215
1216        struct netdev_queue __rcu *ingress_queue;
1217
1218/*
1219 * Cache lines mostly used on transmit path
1220 */
1221        struct netdev_queue     *_tx ____cacheline_aligned_in_smp;
1222
1223        /* Number of TX queues allocated at alloc_netdev_mq() time  */
1224        unsigned int            num_tx_queues;
1225
1226        /* Number of TX queues currently active in device  */
1227        unsigned int            real_num_tx_queues;
1228
1229        /* root qdisc from userspace point of view */
1230        struct Qdisc            *qdisc;
1231
1232        unsigned long           tx_queue_len;   /* Max frames per queue allowed */
1233        spinlock_t              tx_global_lock;
1234
1235#ifdef CONFIG_XPS
1236        struct xps_dev_maps __rcu *xps_maps;
1237#endif
1238
1239        /* These may be needed for future network-power-down code. */
1240
1241        /*
1242         * trans_start here is expensive for high speed devices on SMP,
1243         * please use netdev_queue->trans_start instead.
1244         */
1245        unsigned long           trans_start;    /* Time (in jiffies) of last Tx */
1246
1247        int                     watchdog_timeo; /* used by dev_watchdog() */
1248        struct timer_list       watchdog_timer;
1249
1250        /* Number of references to this device */
1251        int __percpu            *pcpu_refcnt;
1252
1253        /* delayed register/unregister */
1254        struct list_head        todo_list;
1255        /* device index hash chain */
1256        struct hlist_node       index_hlist;
1257
1258        struct list_head        link_watch_list;
1259
1260        /* register/unregister state machine */
1261        enum { NETREG_UNINITIALIZED=0,
1262               NETREG_REGISTERED,       /* completed register_netdevice */
1263               NETREG_UNREGISTERING,    /* called unregister_netdevice */
1264               NETREG_UNREGISTERED,     /* completed unregister todo */
1265               NETREG_RELEASED,         /* called free_netdev */
1266               NETREG_DUMMY,            /* dummy device for NAPI poll */
1267        } reg_state:8;
1268
1269        bool dismantle; /* device is going do be freed */
1270
1271        enum {
1272                RTNL_LINK_INITIALIZED,
1273                RTNL_LINK_INITIALIZING,
1274        } rtnl_link_state:16;
1275
1276        /* Called from unregister, can be used to call free_netdev */
1277        void (*destructor)(struct net_device *dev);
1278
1279#ifdef CONFIG_NETPOLL
1280        struct netpoll_info __rcu       *npinfo;
1281#endif
1282
1283#ifdef CONFIG_NET_NS
1284        /* Network namespace this network device is inside */
1285        struct net              *nd_net;
1286#endif
1287
1288        /* mid-layer private */
1289        union {
1290                void                            *ml_priv;
1291                struct pcpu_lstats __percpu     *lstats; /* loopback stats */
1292                struct pcpu_tstats __percpu     *tstats; /* tunnel stats */
1293                struct pcpu_dstats __percpu     *dstats; /* dummy stats */
1294                struct pcpu_vstats __percpu     *vstats; /* veth stats */
1295        };
1296        /* GARP */
1297        struct garp_port __rcu  *garp_port;
1298        /* MRP */
1299        struct mrp_port __rcu   *mrp_port;
1300
1301        /* class/net/name entry */
1302        struct device           dev;
1303        /* space for optional device, statistics, and wireless sysfs groups */
1304        const struct attribute_group *sysfs_groups[4];
1305
1306        /* rtnetlink link ops */
1307        const struct rtnl_link_ops *rtnl_link_ops;
1308
1309        /* for setting kernel sock attribute on TCP connection setup */
1310#define GSO_MAX_SIZE            65536
1311        unsigned int            gso_max_size;
1312#define GSO_MAX_SEGS            65535
1313        u16                     gso_max_segs;
1314
1315#ifdef CONFIG_DCB
1316        /* Data Center Bridging netlink ops */
1317        const struct dcbnl_rtnl_ops *dcbnl_ops;
1318#endif
1319        u8 num_tc;
1320        struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
1321        u8 prio_tc_map[TC_BITMASK + 1];
1322
1323#if IS_ENABLED(CONFIG_FCOE)
1324        /* max exchange id for FCoE LRO by ddp */
1325        unsigned int            fcoe_ddp_xid;
1326#endif
1327#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
1328        struct netprio_map __rcu *priomap;
1329#endif
1330        /* phy device may attach itself for hardware timestamping */
1331        struct phy_device *phydev;
1332
1333        struct lock_class_key *qdisc_tx_busylock;
1334
1335        /* group the device belongs to */
1336        int group;
1337
1338        struct pm_qos_request   pm_qos_req;
1339};
1340#define to_net_dev(d) container_of(d, struct net_device, dev)
1341
1342#define NETDEV_ALIGN            32
1343
1344static inline
1345int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio)
1346{
1347        return dev->prio_tc_map[prio & TC_BITMASK];
1348}
1349
1350static inline
1351int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc)
1352{
1353        if (tc >= dev->num_tc)
1354                return -EINVAL;
1355
1356        dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK;
1357        return 0;
1358}
1359
1360static inline
1361void netdev_reset_tc(struct net_device *dev)
1362{
1363        dev->num_tc = 0;
1364        memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq));
1365        memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map));
1366}
1367
1368static inline
1369int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset)
1370{
1371        if (tc >= dev->num_tc)
1372                return -EINVAL;
1373
1374        dev->tc_to_txq[tc].count = count;
1375        dev->tc_to_txq[tc].offset = offset;
1376        return 0;
1377}
1378
1379static inline
1380int netdev_set_num_tc(struct net_device *dev, u8 num_tc)
1381{
1382        if (num_tc > TC_MAX_QUEUE)
1383                return -EINVAL;
1384
1385        dev->num_tc = num_tc;
1386        return 0;
1387}
1388
1389static inline
1390int netdev_get_num_tc(struct net_device *dev)
1391{
1392        return dev->num_tc;
1393}
1394
1395static inline
1396struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
1397                                         unsigned int index)
1398{
1399        return &dev->_tx[index];
1400}
1401
1402static inline void netdev_for_each_tx_queue(struct net_device *dev,
1403                                            void (*f)(struct net_device *,
1404                                                      struct netdev_queue *,
1405                                                      void *),
1406                                            void *arg)
1407{
1408        unsigned int i;
1409
1410        for (i = 0; i < dev->num_tx_queues; i++)
1411                f(dev, &dev->_tx[i], arg);
1412}
1413
1414extern struct netdev_queue *netdev_pick_tx(struct net_device *dev,
1415                                           struct sk_buff *skb);
1416extern u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb);
1417
1418/*
1419 * Net namespace inlines
1420 */
1421static inline
1422struct net *dev_net(const struct net_device *dev)
1423{
1424        return read_pnet(&dev->nd_net);
1425}
1426
1427static inline
1428void dev_net_set(struct net_device *dev, struct net *net)
1429{
1430#ifdef CONFIG_NET_NS
1431        release_net(dev->nd_net);
1432        dev->nd_net = hold_net(net);
1433#endif
1434}
1435
1436static inline bool netdev_uses_dsa_tags(struct net_device *dev)
1437{
1438#ifdef CONFIG_NET_DSA_TAG_DSA
1439        if (dev->dsa_ptr != NULL)
1440                return dsa_uses_dsa_tags(dev->dsa_ptr);
1441#endif
1442
1443        return 0;
1444}
1445
1446static inline bool netdev_uses_trailer_tags(struct net_device *dev)
1447{
1448#ifdef CONFIG_NET_DSA_TAG_TRAILER
1449        if (dev->dsa_ptr != NULL)
1450                return dsa_uses_trailer_tags(dev->dsa_ptr);
1451#endif
1452
1453        return 0;
1454}
1455
1456/**
1457 *      netdev_priv - access network device private data
1458 *      @dev: network device
1459 *
1460 * Get network device private data
1461 */
1462static inline void *netdev_priv(const struct net_device *dev)
1463{
1464        return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
1465}
1466
1467/* Set the sysfs physical device reference for the network logical device
1468 * if set prior to registration will cause a symlink during initialization.
1469 */
1470#define SET_NETDEV_DEV(net, pdev)       ((net)->dev.parent = (pdev))
1471
1472/* Set the sysfs device type for the network logical device to allow
1473 * fin grained indentification of different network device types. For
1474 * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
1475 */
1476#define SET_NETDEV_DEVTYPE(net, devtype)        ((net)->dev.type = (devtype))
1477
1478/**
1479 *      netif_napi_add - initialize a napi context
1480 *      @dev:  network device
1481 *      @napi: napi context
1482 *      @poll: polling function
1483 *      @weight: default weight
1484 *
1485 * netif_napi_add() must be used to initialize a napi context prior to calling
1486 * *any* of the other napi related functions.
1487 */
1488void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
1489                    int (*poll)(struct napi_struct *, int), int weight);
1490
1491/**
1492 *  netif_napi_del - remove a napi context
1493 *  @napi: napi context
1494 *
1495 *  netif_napi_del() removes a napi context from the network device napi list
1496 */
1497void netif_napi_del(struct napi_struct *napi);
1498
1499struct napi_gro_cb {
1500        /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
1501        void *frag0;
1502
1503        /* Length of frag0. */
1504        unsigned int frag0_len;
1505
1506        /* This indicates where we are processing relative to skb->data. */
1507        int data_offset;
1508
1509        /* This is non-zero if the packet cannot be merged with the new skb. */
1510        int flush;
1511
1512        /* Number of segments aggregated. */
1513        u16     count;
1514
1515        /* This is non-zero if the packet may be of the same flow. */
1516        u8      same_flow;
1517
1518        /* Free the skb? */
1519        u8      free;
1520#define NAPI_GRO_FREE             1
1521#define NAPI_GRO_FREE_STOLEN_HEAD 2
1522
1523        /* jiffies when first packet was created/queued */
1524        unsigned long age;
1525
1526        /* Used in ipv6_gro_receive() */
1527        int     proto;
1528
1529        /* used in skb_gro_receive() slow path */
1530        struct sk_buff *last;
1531};
1532
1533#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1534
1535struct packet_type {
1536        __be16                  type;   /* This is really htons(ether_type). */
1537        struct net_device       *dev;   /* NULL is wildcarded here           */
1538        int                     (*func) (struct sk_buff *,
1539                                         struct net_device *,
1540                                         struct packet_type *,
1541                                         struct net_device *);
1542        bool                    (*id_match)(struct packet_type *ptype,
1543                                            struct sock *sk);
1544        void                    *af_packet_priv;
1545        struct list_head        list;
1546};
1547
1548struct offload_callbacks {
1549        struct sk_buff          *(*gso_segment)(struct sk_buff *skb,
1550                                                netdev_features_t features);
1551        int                     (*gso_send_check)(struct sk_buff *skb);
1552        struct sk_buff          **(*gro_receive)(struct sk_buff **head,
1553                                               struct sk_buff *skb);
1554        int                     (*gro_complete)(struct sk_buff *skb);
1555};
1556
1557struct packet_offload {
1558        __be16                   type;  /* This is really htons(ether_type). */
1559        struct offload_callbacks callbacks;
1560        struct list_head         list;
1561};
1562
1563#include <linux/notifier.h>
1564
1565/* netdevice notifier chain. Please remember to update the rtnetlink
1566 * notification exclusion list in rtnetlink_event() when adding new
1567 * types.
1568 */
1569#define NETDEV_UP       0x0001  /* For now you can't veto a device up/down */
1570#define NETDEV_DOWN     0x0002
1571#define NETDEV_REBOOT   0x0003  /* Tell a protocol stack a network interface
1572                                   detected a hardware crash and restarted
1573                                   - we can use this eg to kick tcp sessions
1574                                   once done */
1575#define NETDEV_CHANGE   0x0004  /* Notify device state change */
1576#define NETDEV_REGISTER 0x0005
1577#define NETDEV_UNREGISTER       0x0006
1578#define NETDEV_CHANGEMTU        0x0007
1579#define NETDEV_CHANGEADDR       0x0008
1580#define NETDEV_GOING_DOWN       0x0009
1581#define NETDEV_CHANGENAME       0x000A
1582#define NETDEV_FEAT_CHANGE      0x000B
1583#define NETDEV_BONDING_FAILOVER 0x000C
1584#define NETDEV_PRE_UP           0x000D
1585#define NETDEV_PRE_TYPE_CHANGE  0x000E
1586#define NETDEV_POST_TYPE_CHANGE 0x000F
1587#define NETDEV_POST_INIT        0x0010
1588#define NETDEV_UNREGISTER_FINAL 0x0011
1589#define NETDEV_RELEASE          0x0012
1590#define NETDEV_NOTIFY_PEERS     0x0013
1591#define NETDEV_JOIN             0x0014
1592
1593extern int register_netdevice_notifier(struct notifier_block *nb);
1594extern int unregister_netdevice_notifier(struct notifier_block *nb);
1595extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1596
1597
1598extern rwlock_t                         dev_base_lock;          /* Device list lock */
1599
1600extern seqcount_t       devnet_rename_seq;      /* Device rename seq */
1601
1602
1603#define for_each_netdev(net, d)         \
1604                list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1605#define for_each_netdev_reverse(net, d) \
1606                list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
1607#define for_each_netdev_rcu(net, d)             \
1608                list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
1609#define for_each_netdev_safe(net, d, n) \
1610                list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
1611#define for_each_netdev_continue(net, d)                \
1612                list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
1613#define for_each_netdev_continue_rcu(net, d)            \
1614        list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
1615#define net_device_entry(lh)    list_entry(lh, struct net_device, dev_list)
1616
1617static inline struct net_device *next_net_device(struct net_device *dev)
1618{
1619        struct list_head *lh;
1620        struct net *net;
1621
1622        net = dev_net(dev);
1623        lh = dev->dev_list.next;
1624        return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1625}
1626
1627static inline struct net_device *next_net_device_rcu(struct net_device *dev)
1628{
1629        struct list_head *lh;
1630        struct net *net;
1631
1632        net = dev_net(dev);
1633        lh = rcu_dereference(list_next_rcu(&dev->dev_list));
1634        return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1635}
1636
1637static inline struct net_device *first_net_device(struct net *net)
1638{
1639        return list_empty(&net->dev_base_head) ? NULL :
1640                net_device_entry(net->dev_base_head.next);
1641}
1642
1643static inline struct net_device *first_net_device_rcu(struct net *net)
1644{
1645        struct list_head *lh = rcu_dereference(list_next_rcu(&net->dev_base_head));
1646
1647        return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1648}
1649
1650extern int                      netdev_boot_setup_check(struct net_device *dev);
1651extern unsigned long            netdev_boot_base(const char *prefix, int unit);
1652extern struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
1653                                              const char *hwaddr);
1654extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
1655extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
1656extern void             dev_add_pack(struct packet_type *pt);
1657extern void             dev_remove_pack(struct packet_type *pt);
1658extern void             __dev_remove_pack(struct packet_type *pt);
1659extern void             dev_add_offload(struct packet_offload *po);
1660extern void             dev_remove_offload(struct packet_offload *po);
1661extern void             __dev_remove_offload(struct packet_offload *po);
1662
1663extern struct net_device        *dev_get_by_flags_rcu(struct net *net, unsigned short flags,
1664                                                      unsigned short mask);
1665extern struct net_device        *dev_get_by_name(struct net *net, const char *name);
1666extern struct net_device        *dev_get_by_name_rcu(struct net *net, const char *name);
1667extern struct net_device        *__dev_get_by_name(struct net *net, const char *name);
1668extern int              dev_alloc_name(struct net_device *dev, const char *name);
1669extern int              dev_open(struct net_device *dev);
1670extern int              dev_close(struct net_device *dev);
1671extern void             dev_disable_lro(struct net_device *dev);
1672extern int              dev_loopback_xmit(struct sk_buff *newskb);
1673extern int              dev_queue_xmit(struct sk_buff *skb);
1674extern int              register_netdevice(struct net_device *dev);
1675extern void             unregister_netdevice_queue(struct net_device *dev,
1676                                                   struct list_head *head);
1677extern void             unregister_netdevice_many(struct list_head *head);
1678static inline void unregister_netdevice(struct net_device *dev)
1679{
1680        unregister_netdevice_queue(dev, NULL);
1681}
1682
1683extern int              netdev_refcnt_read(const struct net_device *dev);
1684extern void             free_netdev(struct net_device *dev);
1685extern void             synchronize_net(void);
1686extern int              init_dummy_netdev(struct net_device *dev);
1687extern void             netdev_resync_ops(struct net_device *dev);
1688
1689extern struct net_device        *dev_get_by_index(struct net *net, int ifindex);
1690extern struct net_device        *__dev_get_by_index(struct net *net, int ifindex);
1691extern struct net_device        *dev_get_by_index_rcu(struct net *net, int ifindex);
1692extern int              dev_restart(struct net_device *dev);
1693#ifdef CONFIG_NETPOLL_TRAP
1694extern int              netpoll_trap(void);
1695#endif
1696extern int             skb_gro_receive(struct sk_buff **head,
1697                                       struct sk_buff *skb);
1698
1699static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
1700{
1701        return NAPI_GRO_CB(skb)->data_offset;
1702}
1703
1704static inline unsigned int skb_gro_len(const struct sk_buff *skb)
1705{
1706        return skb->len - NAPI_GRO_CB(skb)->data_offset;
1707}
1708
1709static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
1710{
1711        NAPI_GRO_CB(skb)->data_offset += len;
1712}
1713
1714static inline void *skb_gro_header_fast(struct sk_buff *skb,
1715                                        unsigned int offset)
1716{
1717        return NAPI_GRO_CB(skb)->frag0 + offset;
1718}
1719
1720static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
1721{
1722        return NAPI_GRO_CB(skb)->frag0_len < hlen;
1723}
1724
1725static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
1726                                        unsigned int offset)
1727{
1728        if (!pskb_may_pull(skb, hlen))
1729                return NULL;
1730
1731        NAPI_GRO_CB(skb)->frag0 = NULL;
1732        NAPI_GRO_CB(skb)->frag0_len = 0;
1733        return skb->data + offset;
1734}
1735
1736static inline void *skb_gro_mac_header(struct sk_buff *skb)
1737{
1738        return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1739}
1740
1741static inline void *skb_gro_network_header(struct sk_buff *skb)
1742{
1743        return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
1744               skb_network_offset(skb);
1745}
1746
1747static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
1748                                  unsigned short type,
1749                                  const void *daddr, const void *saddr,
1750                                  unsigned int len)
1751{
1752        if (!dev->header_ops || !dev->header_ops->create)
1753                return 0;
1754
1755        return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1756}
1757
1758static inline int dev_parse_header(const struct sk_buff *skb,
1759                                   unsigned char *haddr)
1760{
1761        const struct net_device *dev = skb->dev;
1762
1763        if (!dev->header_ops || !dev->header_ops->parse)
1764                return 0;
1765        return dev->header_ops->parse(skb, haddr);
1766}
1767
1768typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
1769extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
1770static inline int unregister_gifconf(unsigned int family)
1771{
1772        return register_gifconf(family, NULL);
1773}
1774
1775/*
1776 * Incoming packets are placed on per-cpu queues
1777 */
1778struct softnet_data {
1779        struct Qdisc            *output_queue;
1780        struct Qdisc            **output_queue_tailp;
1781        struct list_head        poll_list;
1782        struct sk_buff          *completion_queue;
1783        struct sk_buff_head     process_queue;
1784
1785        /* stats */
1786        unsigned int            processed;
1787        unsigned int            time_squeeze;
1788        unsigned int            cpu_collision;
1789        unsigned int            received_rps;
1790
1791#ifdef CONFIG_RPS
1792        struct softnet_data     *rps_ipi_list;
1793
1794        /* Elements below can be accessed between CPUs for RPS */
1795        struct call_single_data csd ____cacheline_aligned_in_smp;
1796        struct softnet_data     *rps_ipi_next;
1797        unsigned int            cpu;
1798        unsigned int            input_queue_head;
1799        unsigned int            input_queue_tail;
1800#endif
1801        unsigned int            dropped;
1802        struct sk_buff_head     input_pkt_queue;
1803        struct napi_struct      backlog;
1804};
1805
1806static inline void input_queue_head_incr(struct softnet_data *sd)
1807{
1808#ifdef CONFIG_RPS
1809        sd->input_queue_head++;
1810#endif
1811}
1812
1813static inline void input_queue_tail_incr_save(struct softnet_data *sd,
1814                                              unsigned int *qtail)
1815{
1816#ifdef CONFIG_RPS
1817        *qtail = ++sd->input_queue_tail;
1818#endif
1819}
1820
1821DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
1822
1823extern void __netif_schedule(struct Qdisc *q);
1824
1825static inline void netif_schedule_queue(struct netdev_queue *txq)
1826{
1827        if (!(txq->state & QUEUE_STATE_ANY_XOFF))
1828                __netif_schedule(txq->qdisc);
1829}
1830
1831static inline void netif_tx_schedule_all(struct net_device *dev)
1832{
1833        unsigned int i;
1834
1835        for (i = 0; i < dev->num_tx_queues; i++)
1836                netif_schedule_queue(netdev_get_tx_queue(dev, i));
1837}
1838
1839static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
1840{
1841        clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1842}
1843
1844/**
1845 *      netif_start_queue - allow transmit
1846 *      @dev: network device
1847 *
1848 *      Allow upper layers to call the device hard_start_xmit routine.
1849 */
1850static inline void netif_start_queue(struct net_device *dev)
1851{
1852        netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
1853}
1854
1855static inline void netif_tx_start_all_queues(struct net_device *dev)
1856{
1857        unsigned int i;
1858
1859        for (i = 0; i < dev->num_tx_queues; i++) {
1860                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1861                netif_tx_start_queue(txq);
1862        }
1863}
1864
1865static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
1866{
1867#ifdef CONFIG_NETPOLL_TRAP
1868        if (netpoll_trap()) {
1869                netif_tx_start_queue(dev_queue);
1870                return;
1871        }
1872#endif
1873        if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state))
1874                __netif_schedule(dev_queue->qdisc);
1875}
1876
1877/**
1878 *      netif_wake_queue - restart transmit
1879 *      @dev: network device
1880 *
1881 *      Allow upper layers to call the device hard_start_xmit routine.
1882 *      Used for flow control when transmit resources are available.
1883 */
1884static inline void netif_wake_queue(struct net_device *dev)
1885{
1886        netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
1887}
1888
1889static inline void netif_tx_wake_all_queues(struct net_device *dev)
1890{
1891        unsigned int i;
1892
1893        for (i = 0; i < dev->num_tx_queues; i++) {
1894                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1895                netif_tx_wake_queue(txq);
1896        }
1897}
1898
1899static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
1900{
1901        if (WARN_ON(!dev_queue)) {
1902                pr_info("netif_stop_queue() cannot be called before register_netdev()\n");
1903                return;
1904        }
1905        set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1906}
1907
1908/**
1909 *      netif_stop_queue - stop transmitted packets
1910 *      @dev: network device
1911 *
1912 *      Stop upper layers calling the device hard_start_xmit routine.
1913 *      Used for flow control when transmit resources are unavailable.
1914 */
1915static inline void netif_stop_queue(struct net_device *dev)
1916{
1917        netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
1918}
1919
1920static inline void netif_tx_stop_all_queues(struct net_device *dev)
1921{
1922        unsigned int i;
1923
1924        for (i = 0; i < dev->num_tx_queues; i++) {
1925                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1926                netif_tx_stop_queue(txq);
1927        }
1928}
1929
1930static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
1931{
1932        return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1933}
1934
1935/**
1936 *      netif_queue_stopped - test if transmit queue is flowblocked
1937 *      @dev: network device
1938 *
1939 *      Test if transmit queue on device is currently unable to send.
1940 */
1941static inline bool netif_queue_stopped(const struct net_device *dev)
1942{
1943        return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
1944}
1945
1946static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue)
1947{
1948        return dev_queue->state & QUEUE_STATE_ANY_XOFF;
1949}
1950
1951static inline bool netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
1952{
1953        return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
1954}
1955
1956static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
1957                                        unsigned int bytes)
1958{
1959#ifdef CONFIG_BQL
1960        dql_queued(&dev_queue->dql, bytes);
1961
1962        if (likely(dql_avail(&dev_queue->dql) >= 0))
1963                return;
1964
1965        set_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
1966
1967        /*
1968         * The XOFF flag must be set before checking the dql_avail below,
1969         * because in netdev_tx_completed_queue we update the dql_completed
1970         * before checking the XOFF flag.
1971         */
1972        smp_mb();
1973
1974        /* check again in case another CPU has just made room avail */
1975        if (unlikely(dql_avail(&dev_queue->dql) >= 0))
1976                clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
1977#endif
1978}
1979
1980static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes)
1981{
1982        netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes);
1983}
1984
1985static inline void netdev_tx_completed_queue(struct netdev_queue *dev_queue,
1986                                             unsigned int pkts, unsigned int bytes)
1987{
1988#ifdef CONFIG_BQL
1989        if (unlikely(!bytes))
1990                return;
1991
1992        dql_completed(&dev_queue->dql, bytes);
1993
1994        /*
1995         * Without the memory barrier there is a small possiblity that
1996         * netdev_tx_sent_queue will miss the update and cause the queue to
1997         * be stopped forever
1998         */
1999        smp_mb();
2000
2001        if (dql_avail(&dev_queue->dql) < 0)
2002                return;
2003
2004        if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state))
2005                netif_schedule_queue(dev_queue);
2006#endif
2007}
2008
2009static inline void netdev_completed_queue(struct net_device *dev,
2010                                          unsigned int pkts, unsigned int bytes)
2011{
2012        netdev_tx_completed_queue(netdev_get_tx_queue(dev, 0), pkts, bytes);
2013}
2014
2015static inline void netdev_tx_reset_queue(struct netdev_queue *q)
2016{
2017#ifdef CONFIG_BQL
2018        clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state);
2019        dql_reset(&q->dql);
2020#endif
2021}
2022
2023static inline void netdev_reset_queue(struct net_device *dev_queue)
2024{
2025        netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
2026}
2027
2028/**
2029 *      netif_running - test if up
2030 *      @dev: network device
2031 *
2032 *      Test if the device has been brought up.
2033 */
2034static inline bool netif_running(const struct net_device *dev)
2035{
2036        return test_bit(__LINK_STATE_START, &dev->state);
2037}
2038
2039/*
2040 * Routines to manage the subqueues on a device.  We only need start
2041 * stop, and a check if it's stopped.  All other device management is
2042 * done at the overall netdevice level.
2043 * Also test the device if we're multiqueue.
2044 */
2045
2046/**
2047 *      netif_start_subqueue - allow sending packets on subqueue
2048 *      @dev: network device
2049 *      @queue_index: sub queue index
2050 *
2051 * Start individual transmit queue of a device with multiple transmit queues.
2052 */
2053static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
2054{
2055        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2056
2057        netif_tx_start_queue(txq);
2058}
2059
2060/**
2061 *      netif_stop_subqueue - stop sending packets on subqueue
2062 *      @dev: network device
2063 *      @queue_index: sub queue index
2064 *
2065 * Stop individual transmit queue of a device with multiple transmit queues.
2066 */
2067static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
2068{
2069        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2070#ifdef CONFIG_NETPOLL_TRAP
2071        if (netpoll_trap())
2072                return;
2073#endif
2074        netif_tx_stop_queue(txq);
2075}
2076
2077/**
2078 *      netif_subqueue_stopped - test status of subqueue
2079 *      @dev: network device
2080 *      @queue_index: sub queue index
2081 *
2082 * Check individual transmit queue of a device with multiple transmit queues.
2083 */
2084static inline bool __netif_subqueue_stopped(const struct net_device *dev,
2085                                            u16 queue_index)
2086{
2087        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2088
2089        return netif_tx_queue_stopped(txq);
2090}
2091
2092static inline bool netif_subqueue_stopped(const struct net_device *dev,
2093                                          struct sk_buff *skb)
2094{
2095        return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
2096}
2097
2098/**
2099 *      netif_wake_subqueue - allow sending packets on subqueue
2100 *      @dev: network device
2101 *      @queue_index: sub queue index
2102 *
2103 * Resume individual transmit queue of a device with multiple transmit queues.
2104 */
2105static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
2106{
2107        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2108#ifdef CONFIG_NETPOLL_TRAP
2109        if (netpoll_trap())
2110                return;
2111#endif
2112        if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &txq->state))
2113                __netif_schedule(txq->qdisc);
2114}
2115
2116#ifdef CONFIG_XPS
2117extern int netif_set_xps_queue(struct net_device *dev, struct cpumask *mask,
2118                               u16 index);
2119#else
2120static inline int netif_set_xps_queue(struct net_device *dev,
2121                                      struct cpumask *mask,
2122                                      u16 index)
2123{
2124        return 0;
2125}
2126#endif
2127
2128/*
2129 * Returns a Tx hash for the given packet when dev->real_num_tx_queues is used
2130 * as a distribution range limit for the returned value.
2131 */
2132static inline u16 skb_tx_hash(const struct net_device *dev,
2133                              const struct sk_buff *skb)
2134{
2135        return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
2136}
2137
2138/**
2139 *      netif_is_multiqueue - test if device has multiple transmit queues
2140 *      @dev: network device
2141 *
2142 * Check if device has multiple transmit queues
2143 */
2144static inline bool netif_is_multiqueue(const struct net_device *dev)
2145{
2146        return dev->num_tx_queues > 1;
2147}
2148
2149extern int netif_set_real_num_tx_queues(struct net_device *dev,
2150                                        unsigned int txq);
2151
2152#ifdef CONFIG_RPS
2153extern int netif_set_real_num_rx_queues(struct net_device *dev,
2154                                        unsigned int rxq);
2155#else
2156static inline int netif_set_real_num_rx_queues(struct net_device *dev,
2157                                                unsigned int rxq)
2158{
2159        return 0;
2160}
2161#endif
2162
2163static inline int netif_copy_real_num_queues(struct net_device *to_dev,
2164                                             const struct net_device *from_dev)
2165{
2166        int err;
2167
2168        err = netif_set_real_num_tx_queues(to_dev,
2169                                           from_dev->real_num_tx_queues);
2170        if (err)
2171                return err;
2172#ifdef CONFIG_RPS
2173        return netif_set_real_num_rx_queues(to_dev,
2174                                            from_dev->real_num_rx_queues);
2175#else
2176        return 0;
2177#endif
2178}
2179
2180#define DEFAULT_MAX_NUM_RSS_QUEUES      (8)
2181extern int netif_get_num_default_rss_queues(void);
2182
2183/* Use this variant when it is known for sure that it
2184 * is executing from hardware interrupt context or with hardware interrupts
2185 * disabled.
2186 */
2187extern void dev_kfree_skb_irq(struct sk_buff *skb);
2188
2189/* Use this variant in places where it could be invoked
2190 * from either hardware interrupt or other context, with hardware interrupts
2191 * either disabled or enabled.
2192 */
2193extern void dev_kfree_skb_any(struct sk_buff *skb);
2194
2195extern int              netif_rx(struct sk_buff *skb);
2196extern int              netif_rx_ni(struct sk_buff *skb);
2197extern int              netif_receive_skb(struct sk_buff *skb);
2198extern gro_result_t     napi_gro_receive(struct napi_struct *napi,
2199                                         struct sk_buff *skb);
2200extern void             napi_gro_flush(struct napi_struct *napi, bool flush_old);
2201extern struct sk_buff * napi_get_frags(struct napi_struct *napi);
2202extern gro_result_t     napi_gro_frags(struct napi_struct *napi);
2203
2204static inline void napi_free_frags(struct napi_struct *napi)
2205{
2206        kfree_skb(napi->skb);
2207        napi->skb = NULL;
2208}
2209
2210extern int netdev_rx_handler_register(struct net_device *dev,
2211                                      rx_handler_func_t *rx_handler,
2212                                      void *rx_handler_data);
2213extern void netdev_rx_handler_unregister(struct net_device *dev);
2214
2215extern bool             dev_valid_name(const char *name);
2216extern int              dev_ioctl(struct net *net, unsigned int cmd, void __user *);
2217extern int              dev_ethtool(struct net *net, struct ifreq *);
2218extern unsigned int     dev_get_flags(const struct net_device *);
2219extern int              __dev_change_flags(struct net_device *, unsigned int flags);
2220extern int              dev_change_flags(struct net_device *, unsigned int);
2221extern void             __dev_notify_flags(struct net_device *, unsigned int old_flags);
2222extern int              dev_change_name(struct net_device *, const char *);
2223extern int              dev_set_alias(struct net_device *, const char *, size_t);
2224extern int              dev_change_net_namespace(struct net_device *,
2225                                                 struct net *, const char *);
2226extern int              dev_set_mtu(struct net_device *, int);
2227extern void             dev_set_group(struct net_device *, int);
2228extern int              dev_set_mac_address(struct net_device *,
2229                                            struct sockaddr *);
2230extern int              dev_change_carrier(struct net_device *,
2231                                           bool new_carrier);
2232extern int              dev_hard_start_xmit(struct sk_buff *skb,
2233                                            struct net_device *dev,
2234                                            struct netdev_queue *txq);
2235extern int              dev_forward_skb(struct net_device *dev,
2236                                        struct sk_buff *skb);
2237
2238extern int              netdev_budget;
2239
2240/* Called by rtnetlink.c:rtnl_unlock() */
2241extern void netdev_run_todo(void);
2242
2243/**
2244 *      dev_put - release reference to device
2245 *      @dev: network device
2246 *
2247 * Release reference to device to allow it to be freed.
2248 */
2249static inline void dev_put(struct net_device *dev)
2250{
2251        this_cpu_dec(*dev->pcpu_refcnt);
2252}
2253
2254/**
2255 *      dev_hold - get reference to device
2256 *      @dev: network device
2257 *
2258 * Hold reference to device to keep it from being freed.
2259 */
2260static inline void dev_hold(struct net_device *dev)
2261{
2262        this_cpu_inc(*dev->pcpu_refcnt);
2263}
2264
2265/* Carrier loss detection, dial on demand. The functions netif_carrier_on
2266 * and _off may be called from IRQ context, but it is caller
2267 * who is responsible for serialization of these calls.
2268 *
2269 * The name carrier is inappropriate, these functions should really be
2270 * called netif_lowerlayer_*() because they represent the state of any
2271 * kind of lower layer not just hardware media.
2272 */
2273
2274extern void linkwatch_init_dev(struct net_device *dev);
2275extern void linkwatch_fire_event(struct net_device *dev);
2276extern void linkwatch_forget_dev(struct net_device *dev);
2277
2278/**
2279 *      netif_carrier_ok - test if carrier present
2280 *      @dev: network device
2281 *
2282 * Check if carrier is present on device
2283 */
2284static inline bool netif_carrier_ok(const struct net_device *dev)
2285{
2286        return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
2287}
2288
2289extern unsigned long dev_trans_start(struct net_device *dev);
2290
2291extern void __netdev_watchdog_up(struct net_device *dev);
2292
2293extern void netif_carrier_on(struct net_device *dev);
2294
2295extern void netif_carrier_off(struct net_device *dev);
2296
2297/**
2298 *      netif_dormant_on - mark device as dormant.
2299 *      @dev: network device
2300 *
2301 * Mark device as dormant (as per RFC2863).
2302 *
2303 * The dormant state indicates that the relevant interface is not
2304 * actually in a condition to pass packets (i.e., it is not 'up') but is
2305 * in a "pending" state, waiting for some external event.  For "on-
2306 * demand" interfaces, this new state identifies the situation where the
2307 * interface is waiting for events to place it in the up state.
2308 *
2309 */
2310static inline void netif_dormant_on(struct net_device *dev)
2311{
2312        if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
2313                linkwatch_fire_event(dev);
2314}
2315
2316/**
2317 *      netif_dormant_off - set device as not dormant.
2318 *      @dev: network device
2319 *
2320 * Device is not in dormant state.
2321 */
2322static inline void netif_dormant_off(struct net_device *dev)
2323{
2324        if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
2325                linkwatch_fire_event(dev);
2326}
2327
2328/**
2329 *      netif_dormant - test if carrier present
2330 *      @dev: network device
2331 *
2332 * Check if carrier is present on device
2333 */
2334static inline bool netif_dormant(const struct net_device *dev)
2335{
2336        return test_bit(__LINK_STATE_DORMANT, &dev->state);
2337}
2338
2339
2340/**
2341 *      netif_oper_up - test if device is operational
2342 *      @dev: network device
2343 *
2344 * Check if carrier is operational
2345 */
2346static inline bool netif_oper_up(const struct net_device *dev)
2347{
2348        return (dev->operstate == IF_OPER_UP ||
2349                dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
2350}
2351
2352/**
2353 *      netif_device_present - is device available or removed
2354 *      @dev: network device
2355 *
2356 * Check if device has not been removed from system.
2357 */
2358static inline bool netif_device_present(struct net_device *dev)
2359{
2360        return test_bit(__LINK_STATE_PRESENT, &dev->state);
2361}
2362
2363extern void netif_device_detach(struct net_device *dev);
2364
2365extern void netif_device_attach(struct net_device *dev);
2366
2367/*
2368 * Network interface message level settings
2369 */
2370
2371enum {
2372        NETIF_MSG_DRV           = 0x0001,
2373        NETIF_MSG_PROBE         = 0x0002,
2374        NETIF_MSG_LINK          = 0x0004,
2375        NETIF_MSG_TIMER         = 0x0008,
2376        NETIF_MSG_IFDOWN        = 0x0010,
2377        NETIF_MSG_IFUP          = 0x0020,
2378        NETIF_MSG_RX_ERR        = 0x0040,
2379        NETIF_MSG_TX_ERR        = 0x0080,
2380        NETIF_MSG_TX_QUEUED     = 0x0100,
2381        NETIF_MSG_INTR          = 0x0200,
2382        NETIF_MSG_TX_DONE       = 0x0400,
2383        NETIF_MSG_RX_STATUS     = 0x0800,
2384        NETIF_MSG_PKTDATA       = 0x1000,
2385        NETIF_MSG_HW            = 0x2000,
2386        NETIF_MSG_WOL           = 0x4000,
2387};
2388
2389#define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
2390#define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
2391#define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
2392#define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
2393#define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
2394#define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
2395#define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
2396#define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
2397#define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
2398#define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
2399#define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
2400#define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
2401#define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
2402#define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
2403#define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
2404
2405static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
2406{
2407        /* use default */
2408        if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
2409                return default_msg_enable_bits;
2410        if (debug_value == 0)   /* no output */
2411                return 0;
2412        /* set low N bits */
2413        return (1 << debug_value) - 1;
2414}
2415
2416static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
2417{
2418        spin_lock(&txq->_xmit_lock);
2419        txq->xmit_lock_owner = cpu;
2420}
2421
2422static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
2423{
2424        spin_lock_bh(&txq->_xmit_lock);
2425        txq->xmit_lock_owner = smp_processor_id();
2426}
2427
2428static inline bool __netif_tx_trylock(struct netdev_queue *txq)
2429{
2430        bool ok = spin_trylock(&txq->_xmit_lock);
2431        if (likely(ok))
2432                txq->xmit_lock_owner = smp_processor_id();
2433        return ok;
2434}
2435
2436static inline void __netif_tx_unlock(struct netdev_queue *txq)
2437{
2438        txq->xmit_lock_owner = -1;
2439        spin_unlock(&txq->_xmit_lock);
2440}
2441
2442static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
2443{
2444        txq->xmit_lock_owner = -1;
2445        spin_unlock_bh(&txq->_xmit_lock);
2446}
2447
2448static inline void txq_trans_update(struct netdev_queue *txq)
2449{
2450        if (txq->xmit_lock_owner != -1)
2451                txq->trans_start = jiffies;
2452}
2453
2454/**
2455 *      netif_tx_lock - grab network device transmit lock
2456 *      @dev: network device
2457 *
2458 * Get network device transmit lock
2459 */
2460static inline void netif_tx_lock(struct net_device *dev)
2461{
2462        unsigned int i;
2463        int cpu;
2464
2465        spin_lock(&dev->tx_global_lock);
2466        cpu = smp_processor_id();
2467        for (i = 0; i < dev->num_tx_queues; i++) {
2468                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2469
2470                /* We are the only thread of execution doing a
2471                 * freeze, but we have to grab the _xmit_lock in
2472                 * order to synchronize with threads which are in
2473                 * the ->hard_start_xmit() handler and already
2474                 * checked the frozen bit.
2475                 */
2476                __netif_tx_lock(txq, cpu);
2477                set_bit(__QUEUE_STATE_FROZEN, &txq->state);
2478                __netif_tx_unlock(txq);
2479        }
2480}
2481
2482static inline void netif_tx_lock_bh(struct net_device *dev)
2483{
2484        local_bh_disable();
2485        netif_tx_lock(dev);
2486}
2487
2488static inline void netif_tx_unlock(struct net_device *dev)
2489{
2490        unsigned int i;
2491
2492        for (i = 0; i < dev->num_tx_queues; i++) {
2493                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2494
2495                /* No need to grab the _xmit_lock here.  If the
2496                 * queue is not stopped for another reason, we
2497                 * force a schedule.
2498                 */
2499                clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
2500                netif_schedule_queue(txq);
2501        }
2502        spin_unlock(&dev->tx_global_lock);
2503}
2504
2505static inline void netif_tx_unlock_bh(struct net_device *dev)
2506{
2507        netif_tx_unlock(dev);
2508        local_bh_enable();
2509}
2510
2511#define HARD_TX_LOCK(dev, txq, cpu) {                   \
2512        if ((dev->features & NETIF_F_LLTX) == 0) {      \
2513                __netif_tx_lock(txq, cpu);              \
2514        }                                               \
2515}
2516
2517#define HARD_TX_UNLOCK(dev, txq) {                      \
2518        if ((dev->features & NETIF_F_LLTX) == 0) {      \
2519                __netif_tx_unlock(txq);                 \
2520        }                                               \
2521}
2522
2523static inline void netif_tx_disable(struct net_device *dev)
2524{
2525        unsigned int i;
2526        int cpu;
2527
2528        local_bh_disable();
2529        cpu = smp_processor_id();
2530        for (i = 0; i < dev->num_tx_queues; i++) {
2531                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2532
2533                __netif_tx_lock(txq, cpu);
2534                netif_tx_stop_queue(txq);
2535                __netif_tx_unlock(txq);
2536        }
2537        local_bh_enable();
2538}
2539
2540static inline void netif_addr_lock(struct net_device *dev)
2541{
2542        spin_lock(&dev->addr_list_lock);
2543}
2544
2545static inline void netif_addr_lock_nested(struct net_device *dev)
2546{
2547        spin_lock_nested(&dev->addr_list_lock, SINGLE_DEPTH_NESTING);
2548}
2549
2550static inline void netif_addr_lock_bh(struct net_device *dev)
2551{
2552        spin_lock_bh(&dev->addr_list_lock);
2553}
2554
2555static inline void netif_addr_unlock(struct net_device *dev)
2556{
2557        spin_unlock(&dev->addr_list_lock);
2558}
2559
2560static inline void netif_addr_unlock_bh(struct net_device *dev)
2561{
2562        spin_unlock_bh(&dev->addr_list_lock);
2563}
2564
2565/*
2566 * dev_addrs walker. Should be used only for read access. Call with
2567 * rcu_read_lock held.
2568 */
2569#define for_each_dev_addr(dev, ha) \
2570                list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
2571
2572/* These functions live elsewhere (drivers/net/net_init.c, but related) */
2573
2574extern void             ether_setup(struct net_device *dev);
2575
2576/* Support for loadable net-drivers */
2577extern struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
2578                                       void (*setup)(struct net_device *),
2579                                       unsigned int txqs, unsigned int rxqs);
2580#define alloc_netdev(sizeof_priv, name, setup) \
2581        alloc_netdev_mqs(sizeof_priv, name, setup, 1, 1)
2582
2583#define alloc_netdev_mq(sizeof_priv, name, setup, count) \
2584        alloc_netdev_mqs(sizeof_priv, name, setup, count, count)
2585
2586extern int              register_netdev(struct net_device *dev);
2587extern void             unregister_netdev(struct net_device *dev);
2588
2589/* General hardware address lists handling functions */
2590extern int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
2591                                  struct netdev_hw_addr_list *from_list,
2592                                  int addr_len, unsigned char addr_type);
2593extern void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
2594                                   struct netdev_hw_addr_list *from_list,
2595                                   int addr_len, unsigned char addr_type);
2596extern int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
2597                          struct netdev_hw_addr_list *from_list,
2598                          int addr_len);
2599extern void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
2600                             struct netdev_hw_addr_list *from_list,
2601                             int addr_len);
2602extern void __hw_addr_flush(struct netdev_hw_addr_list *list);
2603extern void __hw_addr_init(struct netdev_hw_addr_list *list);
2604
2605/* Functions used for device addresses handling */
2606extern int dev_addr_add(struct net_device *dev, const unsigned char *addr,
2607                        unsigned char addr_type);
2608extern int dev_addr_del(struct net_device *dev, const unsigned char *addr,
2609                        unsigned char addr_type);
2610extern int dev_addr_add_multiple(struct net_device *to_dev,
2611                                 struct net_device *from_dev,
2612                                 unsigned char addr_type);
2613extern int dev_addr_del_multiple(struct net_device *to_dev,
2614                                 struct net_device *from_dev,
2615                                 unsigned char addr_type);
2616extern void dev_addr_flush(struct net_device *dev);
2617extern int dev_addr_init(struct net_device *dev);
2618
2619/* Functions used for unicast addresses handling */
2620extern int dev_uc_add(struct net_device *dev, const unsigned char *addr);
2621extern int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr);
2622extern int dev_uc_del(struct net_device *dev, const unsigned char *addr);
2623extern int dev_uc_sync(struct net_device *to, struct net_device *from);
2624extern void dev_uc_unsync(struct net_device *to, struct net_device *from);
2625extern void dev_uc_flush(struct net_device *dev);
2626extern void dev_uc_init(struct net_device *dev);
2627
2628/* Functions used for multicast addresses handling */
2629extern int dev_mc_add(struct net_device *dev, const unsigned char *addr);
2630extern int dev_mc_add_global(struct net_device *dev, const unsigned char *addr);
2631extern int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr);
2632extern int dev_mc_del(struct net_device *dev, const unsigned char *addr);
2633extern int dev_mc_del_global(struct net_device *dev, const unsigned char *addr);
2634extern int dev_mc_sync(struct net_device *to, struct net_device *from);
2635extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
2636extern void dev_mc_flush(struct net_device *dev);
2637extern void dev_mc_init(struct net_device *dev);
2638
2639/* Functions used for secondary unicast and multicast support */
2640extern void             dev_set_rx_mode(struct net_device *dev);
2641extern void             __dev_set_rx_mode(struct net_device *dev);
2642extern int              dev_set_promiscuity(struct net_device *dev, int inc);
2643extern int              dev_set_allmulti(struct net_device *dev, int inc);
2644extern void             netdev_state_change(struct net_device *dev);
2645extern void             netdev_notify_peers(struct net_device *dev);
2646extern void             netdev_features_change(struct net_device *dev);
2647/* Load a device via the kmod */
2648extern void             dev_load(struct net *net, const char *name);
2649extern struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
2650                                               struct rtnl_link_stats64 *storage);
2651extern void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
2652                                    const struct net_device_stats *netdev_stats);
2653
2654extern int              netdev_max_backlog;
2655extern int              netdev_tstamp_prequeue;
2656extern int              weight_p;
2657extern int              bpf_jit_enable;
2658
2659extern bool netdev_has_upper_dev(struct net_device *dev,
2660                                 struct net_device *upper_dev);
2661extern bool netdev_has_any_upper_dev(struct net_device *dev);
2662extern struct net_device *netdev_master_upper_dev_get(struct net_device *dev);
2663extern struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev);
2664extern int netdev_upper_dev_link(struct net_device *dev,
2665                                 struct net_device *upper_dev);
2666extern int netdev_master_upper_dev_link(struct net_device *dev,
2667                                        struct net_device *upper_dev);
2668extern void netdev_upper_dev_unlink(struct net_device *dev,
2669                                    struct net_device *upper_dev);
2670extern int skb_checksum_help(struct sk_buff *skb);
2671extern struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
2672        netdev_features_t features, bool tx_path);
2673extern struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
2674                                          netdev_features_t features);
2675
2676static inline
2677struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features)
2678{
2679        return __skb_gso_segment(skb, features, true);
2680}
2681
2682#ifdef CONFIG_BUG
2683extern void netdev_rx_csum_fault(struct net_device *dev);
2684#else
2685static inline void netdev_rx_csum_fault(struct net_device *dev)
2686{
2687}
2688#endif
2689/* rx skb timestamps */
2690extern void             net_enable_timestamp(void);
2691extern void             net_disable_timestamp(void);
2692
2693#ifdef CONFIG_PROC_FS
2694extern int __init dev_proc_init(void);
2695#else
2696#define dev_proc_init() 0
2697#endif
2698
2699extern int netdev_class_create_file(struct class_attribute *class_attr);
2700extern void netdev_class_remove_file(struct class_attribute *class_attr);
2701
2702extern struct kobj_ns_type_operations net_ns_type_operations;
2703
2704extern const char *netdev_drivername(const struct net_device *dev);
2705
2706extern void linkwatch_run_queue(void);
2707
2708static inline netdev_features_t netdev_get_wanted_features(
2709        struct net_device *dev)
2710{
2711        return (dev->features & ~dev->hw_features) | dev->wanted_features;
2712}
2713netdev_features_t netdev_increment_features(netdev_features_t all,
2714        netdev_features_t one, netdev_features_t mask);
2715int __netdev_update_features(struct net_device *dev);
2716void netdev_update_features(struct net_device *dev);
2717void netdev_change_features(struct net_device *dev);
2718
2719void netif_stacked_transfer_operstate(const struct net_device *rootdev,
2720                                        struct net_device *dev);
2721
2722netdev_features_t netif_skb_features(struct sk_buff *skb);
2723
2724static inline bool net_gso_ok(netdev_features_t features, int gso_type)
2725{
2726        netdev_features_t feature = gso_type << NETIF_F_GSO_SHIFT;
2727
2728        /* check flags correspondence */
2729        BUILD_BUG_ON(SKB_GSO_TCPV4   != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT));
2730        BUILD_BUG_ON(SKB_GSO_UDP     != (NETIF_F_UFO >> NETIF_F_GSO_SHIFT));
2731        BUILD_BUG_ON(SKB_GSO_DODGY   != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT));
2732        BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT));
2733        BUILD_BUG_ON(SKB_GSO_TCPV6   != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT));
2734        BUILD_BUG_ON(SKB_GSO_FCOE    != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT));
2735
2736        return (features & feature) == feature;
2737}
2738
2739static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
2740{
2741        return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
2742               (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
2743}
2744
2745static inline bool netif_needs_gso(struct sk_buff *skb,
2746                                   netdev_features_t features)
2747{
2748        return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
2749                unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
2750                         (skb->ip_summed != CHECKSUM_UNNECESSARY)));
2751}
2752
2753static inline void netif_set_gso_max_size(struct net_device *dev,
2754                                          unsigned int size)
2755{
2756        dev->gso_max_size = size;
2757}
2758
2759static inline bool netif_is_bond_slave(struct net_device *dev)
2760{
2761        return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
2762}
2763
2764static inline bool netif_supports_nofcs(struct net_device *dev)
2765{
2766        return dev->priv_flags & IFF_SUPP_NOFCS;
2767}
2768
2769extern struct pernet_operations __net_initdata loopback_net_ops;
2770
2771/* Logging, debugging and troubleshooting/diagnostic helpers. */
2772
2773/* netdev_printk helpers, similar to dev_printk */
2774
2775static inline const char *netdev_name(const struct net_device *dev)
2776{
2777        if (dev->reg_state != NETREG_REGISTERED)
2778                return "(unregistered net_device)";
2779        return dev->name;
2780}
2781
2782extern __printf(3, 4)
2783int netdev_printk(const char *level, const struct net_device *dev,
2784                  const char *format, ...);
2785extern __printf(2, 3)
2786int netdev_emerg(const struct net_device *dev, const char *format, ...);
2787extern __printf(2, 3)
2788int netdev_alert(const struct net_device *dev, const char *format, ...);
2789extern __printf(2, 3)
2790int netdev_crit(const struct net_device *dev, const char *format, ...);
2791extern __printf(2, 3)
2792int netdev_err(const struct net_device *dev, const char *format, ...);
2793extern __printf(2, 3)
2794int netdev_warn(const struct net_device *dev, const char *format, ...);
2795extern __printf(2, 3)
2796int netdev_notice(const struct net_device *dev, const char *format, ...);
2797extern __printf(2, 3)
2798int netdev_info(const struct net_device *dev, const char *format, ...);
2799
2800#define MODULE_ALIAS_NETDEV(device) \
2801        MODULE_ALIAS("netdev-" device)
2802
2803#if defined(CONFIG_DYNAMIC_DEBUG)
2804#define netdev_dbg(__dev, format, args...)                      \
2805do {                                                            \
2806        dynamic_netdev_dbg(__dev, format, ##args);              \
2807} while (0)
2808#elif defined(DEBUG)
2809#define netdev_dbg(__dev, format, args...)                      \
2810        netdev_printk(KERN_DEBUG, __dev, format, ##args)
2811#else
2812#define netdev_dbg(__dev, format, args...)                      \
2813({                                                              \
2814        if (0)                                                  \
2815                netdev_printk(KERN_DEBUG, __dev, format, ##args); \
2816        0;                                                      \
2817})
2818#endif
2819
2820#if defined(VERBOSE_DEBUG)
2821#define netdev_vdbg     netdev_dbg
2822#else
2823
2824#define netdev_vdbg(dev, format, args...)                       \
2825({                                                              \
2826        if (0)                                                  \
2827                netdev_printk(KERN_DEBUG, dev, format, ##args); \
2828        0;                                                      \
2829})
2830#endif
2831
2832/*
2833 * netdev_WARN() acts like dev_printk(), but with the key difference
2834 * of using a WARN/WARN_ON to get the message out, including the
2835 * file/line information and a backtrace.
2836 */
2837#define netdev_WARN(dev, format, args...)                       \
2838        WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args);
2839
2840/* netif printk helpers, similar to netdev_printk */
2841
2842#define netif_printk(priv, type, level, dev, fmt, args...)      \
2843do {                                                            \
2844        if (netif_msg_##type(priv))                             \
2845                netdev_printk(level, (dev), fmt, ##args);       \
2846} while (0)
2847
2848#define netif_level(level, priv, type, dev, fmt, args...)       \
2849do {                                                            \
2850        if (netif_msg_##type(priv))                             \
2851                netdev_##level(dev, fmt, ##args);               \
2852} while (0)
2853
2854#define netif_emerg(priv, type, dev, fmt, args...)              \
2855        netif_level(emerg, priv, type, dev, fmt, ##args)
2856#define netif_alert(priv, type, dev, fmt, args...)              \
2857        netif_level(alert, priv, type, dev, fmt, ##args)
2858#define netif_crit(priv, type, dev, fmt, args...)               \
2859        netif_level(crit, priv, type, dev, fmt, ##args)
2860#define netif_err(priv, type, dev, fmt, args...)                \
2861        netif_level(err, priv, type, dev, fmt, ##args)
2862#define netif_warn(priv, type, dev, fmt, args...)               \
2863        netif_level(warn, priv, type, dev, fmt, ##args)
2864#define netif_notice(priv, type, dev, fmt, args...)             \
2865        netif_level(notice, priv, type, dev, fmt, ##args)
2866#define netif_info(priv, type, dev, fmt, args...)               \
2867        netif_level(info, priv, type, dev, fmt, ##args)
2868
2869#if defined(CONFIG_DYNAMIC_DEBUG)
2870#define netif_dbg(priv, type, netdev, format, args...)          \
2871do {                                                            \
2872        if (netif_msg_##type(priv))                             \
2873                dynamic_netdev_dbg(netdev, format, ##args);     \
2874} while (0)
2875#elif defined(DEBUG)
2876#define netif_dbg(priv, type, dev, format, args...)             \
2877        netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
2878#else
2879#define netif_dbg(priv, type, dev, format, args...)                     \
2880({                                                                      \
2881        if (0)                                                          \
2882                netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2883        0;                                                              \
2884})
2885#endif
2886
2887#if defined(VERBOSE_DEBUG)
2888#define netif_vdbg      netif_dbg
2889#else
2890#define netif_vdbg(priv, type, dev, format, args...)            \
2891({                                                              \
2892        if (0)                                                  \
2893                netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2894        0;                                                      \
2895})
2896#endif
2897
2898/*
2899 *      The list of packet types we will receive (as opposed to discard)
2900 *      and the routines to invoke.
2901 *
2902 *      Why 16. Because with 16 the only overlap we get on a hash of the
2903 *      low nibble of the protocol value is RARP/SNAP/X.25.
2904 *
2905 *      NOTE:  That is no longer true with the addition of VLAN tags.  Not
2906 *             sure which should go first, but I bet it won't make much
2907 *             difference if we are running VLANs.  The good news is that
2908 *             this protocol won't be in the list unless compiled in, so
2909 *             the average user (w/out VLANs) will not be adversely affected.
2910 *             --BLG
2911 *
2912 *              0800    IP
2913 *              8100    802.1Q VLAN
2914 *              0001    802.3
2915 *              0002    AX.25
2916 *              0004    802.2
2917 *              8035    RARP
2918 *              0005    SNAP
2919 *              0805    X.25
2920 *              0806    ARP
2921 *              8137    IPX
2922 *              0009    Localtalk
2923 *              86DD    IPv6
2924 */
2925#define PTYPE_HASH_SIZE (16)
2926#define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
2927
2928#endif  /* _LINUX_NETDEVICE_H */
2929
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