include/linux/netdevice.h

   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.Cox@linux.org>
  15  *              Bjorn Ekwall. <bj0rn@blox.se>
  16  *              Pekka Riikonen <priikone@poseidon.pspt.fi>
  17  *
  18  *              This program is free software; you can redistribute it and/or
  19  *              modify it under the terms of the GNU General Public License
  20  *              as published by the Free Software Foundation; either version
  21  *              2 of the License, or (at your option) any later version.
  22  *
  23  *              Moved to /usr/include/linux for NET3
  24  */
  25 #ifndef _LINUX_NETDEVICE_H
  26 #define _LINUX_NETDEVICE_H
  27
  28 #include <linux/if.h>
  29 #include <linux/if_ether.h>
  30 #include <linux/if_packet.h>
  31
  32 #ifdef __KERNEL__
  33 #include <linux/timer.h>
  34 #include <linux/delay.h>
  35 #include <asm/atomic.h>
  36 #include <asm/cache.h>
  37 #include <asm/byteorder.h>
  38
  39 #include <linux/device.h>
  40 #include <linux/percpu.h>
  41 #include <linux/dmaengine.h>
  42 #include <linux/workqueue.h>
  43
  44 #include <net/net_namespace.h>
  45
  46 struct vlan_group;
  47 struct ethtool_ops;
  48 struct netpoll_info;
  49 /* 802.11 specific */
  50 struct wireless_dev;
  51                                         /* source back-compat hooks */
  52 #define SET_ETHTOOL_OPS(netdev,ops) \
  53         ( (netdev)->ethtool_ops = (ops) )
  54
  55 #define HAVE_ALLOC_NETDEV               /* feature macro: alloc_xxxdev
  56                                            functions are available. */
  57 #define HAVE_FREE_NETDEV                /* free_netdev() */
  58 #define HAVE_NETDEV_PRIV                /* netdev_priv() */
  59
  60 #define NET_XMIT_SUCCESS        0
  61 #define NET_XMIT_DROP           1       /* skb dropped                  */
  62 #define NET_XMIT_CN             2       /* congestion notification      */
  63 #define NET_XMIT_POLICED        3       /* skb is shot by police        */
  64 #define NET_XMIT_BYPASS         4       /* packet does not leave via dequeue;
  65                                            (TC use only - dev_queue_xmit
  66                                            returns this as NET_XMIT_SUCCESS) */
  67
  68 /* Backlog congestion levels */
  69 #define NET_RX_SUCCESS          0   /* keep 'em coming, baby */
  70 #define NET_RX_DROP             1  /* packet dropped */
  71 #define NET_RX_CN_LOW           2   /* storm alert, just in case */
  72 #define NET_RX_CN_MOD           3   /* Storm on its way! */
  73 #define NET_RX_CN_HIGH          4   /* The storm is here */
  74 #define NET_RX_BAD              5  /* packet dropped due to kernel error */
  75
  76 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
  77  * indicates that the device will soon be dropping packets, or already drops
  78  * some packets of the same priority; prompting us to send less aggressively. */
  79 #define net_xmit_eval(e)        ((e) == NET_XMIT_CN? 0 : (e))
  80 #define net_xmit_errno(e)       ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
  81
  82 #endif
  83
  84 #define MAX_ADDR_LEN    32              /* Largest hardware address length */
  85
  86 /* Driver transmit return codes */
  87 #define NETDEV_TX_OK 0          /* driver took care of packet */
  88 #define NETDEV_TX_BUSY 1        /* driver tx path was busy*/
  89 #define NETDEV_TX_LOCKED -1     /* driver tx lock was already taken */
  90
  91 /*
  92  *      Compute the worst case header length according to the protocols
  93  *      used.
  94  */
  95
  96 #if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR)
  97 #define LL_MAX_HEADER   32
  98 #else
  99 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
 100 #define LL_MAX_HEADER   96
 101 #else
 102 #define LL_MAX_HEADER   48
 103 #endif
 104 #endif
 105
 106 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \
 107     !defined(CONFIG_NET_IPGRE) &&  !defined(CONFIG_NET_IPGRE_MODULE) && \
 108     !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \
 109     !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE)
 110 #define MAX_HEADER LL_MAX_HEADER
 111 #else
 112 #define MAX_HEADER (LL_MAX_HEADER + 48)
 113 #endif
 114
 115 struct net_device_subqueue
 116 {
 117         /* Give a control state for each queue.  This struct may contain
 118          * per-queue locks in the future.
 119          */
 120         unsigned long   state;
 121 };
 122
 123 /*
 124  *      Network device statistics. Akin to the 2.0 ether stats but
 125  *      with byte counters.
 126  */
 127
 128 struct net_device_stats
 129 {
 130         unsigned long   rx_packets;             /* total packets received       */
 131         unsigned long   tx_packets;             /* total packets transmitted    */
 132         unsigned long   rx_bytes;               /* total bytes received         */
 133         unsigned long   tx_bytes;               /* total bytes transmitted      */
 134         unsigned long   rx_errors;              /* bad packets received         */
 135         unsigned long   tx_errors;              /* packet transmit problems     */
 136         unsigned long   rx_dropped;             /* no space in linux buffers    */
 137         unsigned long   tx_dropped;             /* no space available in linux  */
 138         unsigned long   multicast;              /* multicast packets received   */
 139         unsigned long   collisions;
 140
 141         /* detailed rx_errors: */
 142         unsigned long   rx_length_errors;
 143         unsigned long   rx_over_errors;         /* receiver ring buff overflow  */
 144         unsigned long   rx_crc_errors;          /* recved pkt with crc error    */
 145         unsigned long   rx_frame_errors;        /* recv'd frame alignment error */
 146         unsigned long   rx_fifo_errors;         /* recv'r fifo overrun          */
 147         unsigned long   rx_missed_errors;       /* receiver missed packet       */
 148
 149         /* detailed tx_errors */
 150         unsigned long   tx_aborted_errors;
 151         unsigned long   tx_carrier_errors;
 152         unsigned long   tx_fifo_errors;
 153         unsigned long   tx_heartbeat_errors;
 154         unsigned long   tx_window_errors;
 155
 156         /* for cslip etc */
 157         unsigned long   rx_compressed;
 158         unsigned long   tx_compressed;
 159 };
 160
 161
 162 /* Media selection options. */
 163 enum {
 164         IF_PORT_UNKNOWN = 0,
 165         IF_PORT_10BASE2,
 166         IF_PORT_10BASET,
 167         IF_PORT_AUI,
 168         IF_PORT_100BASET,
 169         IF_PORT_100BASETX,
 170         IF_PORT_100BASEFX
 171 };
 172
 173 #ifdef __KERNEL__
 174
 175 #include <linux/cache.h>
 176 #include <linux/skbuff.h>
 177
 178 struct neighbour;
 179 struct neigh_parms;
 180 struct sk_buff;
 181
 182 struct netif_rx_stats
 183 {
 184         unsigned total;
 185         unsigned dropped;
 186         unsigned time_squeeze;
 187         unsigned cpu_collision;
 188 };
 189
 190 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
 191
 192 struct dev_addr_list
 193 {
 194         struct dev_addr_list    *next;
 195         u8                      da_addr[MAX_ADDR_LEN];
 196         u8                      da_addrlen;
 197         u8                      da_synced;
 198         int                     da_users;
 199         int                     da_gusers;
 200 };
 201
 202 /*
 203  *      We tag multicasts with these structures.
 204  */
 205
 206 #define dev_mc_list     dev_addr_list
 207 #define dmi_addr        da_addr
 208 #define dmi_addrlen     da_addrlen
 209 #define dmi_users       da_users
 210 #define dmi_gusers      da_gusers
 211
 212 struct hh_cache
 213 {
 214         struct hh_cache *hh_next;       /* Next entry                        */
 215         atomic_t        hh_refcnt;      /* number of users                   */
 216 /*
 217  * We want hh_output, hh_len, hh_lock and hh_data be a in a separate
 218  * cache line on SMP.
 219  * They are mostly read, but hh_refcnt may be changed quite frequently,
 220  * incurring cache line ping pongs.
 221  */
 222         __be16          hh_type ____cacheline_aligned_in_smp;
 223                                         /* protocol identifier, f.e ETH_P_IP
 224                                          *  NOTE:  For VLANs, this will be the
 225                                          *  encapuslated type. --BLG
 226                                          */
 227         u16             hh_len;         /* length of header */
 228         int             (*hh_output)(struct sk_buff *skb);
 229         seqlock_t       hh_lock;
 230
 231         /* cached hardware header; allow for machine alignment needs.        */
 232 #define HH_DATA_MOD     16
 233 #define HH_DATA_OFF(__len) \
 234         (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
 235 #define HH_DATA_ALIGN(__len) \
 236         (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
 237         unsigned long   hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
 238 };
 239
 240 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
 241  * Alternative is:
 242  *   dev->hard_header_len ? (dev->hard_header_len +
 243  *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
 244  *
 245  * We could use other alignment values, but we must maintain the
 246  * relationship HH alignment <= LL alignment.
 247  */
 248 #define LL_RESERVED_SPACE(dev) \
 249         (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 250 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
 251         ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 252
 253 /* These flag bits are private to the generic network queueing
 254  * layer, they may not be explicitly referenced by any other
 255  * code.
 256  */
 257
 258 enum netdev_state_t
 259 {
 260         __LINK_STATE_XOFF=0,
 261         __LINK_STATE_START,
 262         __LINK_STATE_PRESENT,
 263         __LINK_STATE_SCHED,
 264         __LINK_STATE_NOCARRIER,
 265         __LINK_STATE_LINKWATCH_PENDING,
 266         __LINK_STATE_DORMANT,
 267         __LINK_STATE_QDISC_RUNNING,
 268 };
 269
 270
 271 /*
 272  * This structure holds at boot time configured netdevice settings. They
 273  * are then used in the device probing.
 274  */
 275 struct netdev_boot_setup {
 276         char name[IFNAMSIZ];
 277         struct ifmap map;
 278 };
 279 #define NETDEV_BOOT_SETUP_MAX 8
 280
 281 extern int __init netdev_boot_setup(char *str);
 282
 283 /*
 284  * Structure for NAPI scheduling similar to tasklet but with weighting
 285  */
 286 struct napi_struct {
 287         /* The poll_list must only be managed by the entity which
 288          * changes the state of the NAPI_STATE_SCHED bit.  This means
 289          * whoever atomically sets that bit can add this napi_struct
 290          * to the per-cpu poll_list, and whoever clears that bit
 291          * can remove from the list right before clearing the bit.
 292          */
 293         struct list_head        poll_list;
 294
 295         unsigned long           state;
 296         int                     weight;
 297         int                     (*poll)(struct napi_struct *, int);
 298 #ifdef CONFIG_NETPOLL
 299         spinlock_t              poll_lock;
 300         int                     poll_owner;
 301         struct net_device       *dev;
 302         struct list_head        dev_list;
 303 #endif
 304 };
 305
 306 enum
 307 {
 308         NAPI_STATE_SCHED,       /* Poll is scheduled */
 309 };
 310
 311 extern void FASTCALL(__napi_schedule(struct napi_struct *n));
 312
 313 /**
 314  *      napi_schedule_prep - check if napi can be scheduled
 315  *      @n: napi context
 316  *
 317  * Test if NAPI routine is already running, and if not mark
 318  * it as running.  This is used as a condition variable
 319  * insure only one NAPI poll instance runs
 320  */
 321 static inline int napi_schedule_prep(struct napi_struct *n)
 322 {
 323         return !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
 324 }
 325
 326 /**
 327  *      napi_schedule - schedule NAPI poll
 328  *      @n: napi context
 329  *
 330  * Schedule NAPI poll routine to be called if it is not already
 331  * running.
 332  */
 333 static inline void napi_schedule(struct napi_struct *n)
 334 {
 335         if (napi_schedule_prep(n))
 336                 __napi_schedule(n);
 337 }
 338
 339 /**
 340  *      napi_complete - NAPI processing complete
 341  *      @n: napi context
 342  *
 343  * Mark NAPI processing as complete.
 344  */
 345 static inline void __napi_complete(struct napi_struct *n)
 346 {
 347         BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
 348         list_del(&n->poll_list);
 349         smp_mb__before_clear_bit();
 350         clear_bit(NAPI_STATE_SCHED, &n->state);
 351 }
 352
 353 static inline void napi_complete(struct napi_struct *n)
 354 {
 355         local_irq_disable();
 356         __napi_complete(n);
 357         local_irq_enable();
 358 }
 359
 360 /**
 361  *      napi_disable - prevent NAPI from scheduling
 362  *      @n: napi context
 363  *
 364  * Stop NAPI from being scheduled on this context.
 365  * Waits till any outstanding processing completes.
 366  */
 367 static inline void napi_disable(struct napi_struct *n)
 368 {
 369         while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
 370                 msleep_interruptible(1);
 371 }
 372
 373 /**
 374  *      napi_enable - enable NAPI scheduling
 375  *      @n: napi context
 376  *
 377  * Resume NAPI from being scheduled on this context.
 378  * Must be paired with napi_disable.
 379  */
 380 static inline void napi_enable(struct napi_struct *n)
 381 {
 382         BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
 383         smp_mb__before_clear_bit();
 384         clear_bit(NAPI_STATE_SCHED, &n->state);
 385 }
 386
 387 /*
 388  *      The DEVICE structure.
 389  *      Actually, this whole structure is a big mistake.  It mixes I/O
 390  *      data with strictly "high-level" data, and it has to know about
 391  *      almost every data structure used in the INET module.
 392  *
 393  *      FIXME: cleanup struct net_device such that network protocol info
 394  *      moves out.
 395  */
 396
 397 struct net_device
 398 {
 399
 400         /*
 401          * This is the first field of the "visible" part of this structure
 402          * (i.e. as seen by users in the "Space.c" file).  It is the name
 403          * the interface.
 404          */
 405         char                    name[IFNAMSIZ];
 406         /* device name hash chain */
 407         struct hlist_node       name_hlist;
 408
 409         /*
 410          *      I/O specific fields
 411          *      FIXME: Merge these and struct ifmap into one
 412          */
 413         unsigned long           mem_end;        /* shared mem end       */
 414         unsigned long           mem_start;      /* shared mem start     */
 415         unsigned long           base_addr;      /* device I/O address   */
 416         unsigned int            irq;            /* device IRQ number    */
 417
 418         /*
 419          *      Some hardware also needs these fields, but they are not
 420          *      part of the usual set specified in Space.c.
 421          */
 422
 423         unsigned char           if_port;        /* Selectable AUI, TP,..*/
 424         unsigned char           dma;            /* DMA channel          */
 425
 426         unsigned long           state;
 427
 428         struct list_head        dev_list;
 429 #ifdef CONFIG_NETPOLL
 430         struct list_head        napi_list;
 431 #endif
 432
 433         /* The device initialization function. Called only once. */
 434         int                     (*init)(struct net_device *dev);
 435
 436         /* ------- Fields preinitialized in Space.c finish here ------- */
 437
 438         /* Net device features */
 439         unsigned long           features;
 440 #define NETIF_F_SG              1       /* Scatter/gather IO. */
 441 #define NETIF_F_IP_CSUM         2       /* Can checksum TCP/UDP over IPv4. */
 442 #define NETIF_F_NO_CSUM         4       /* Does not require checksum. F.e. loopack. */
 443 #define NETIF_F_HW_CSUM         8       /* Can checksum all the packets. */
 444 #define NETIF_F_IPV6_CSUM       16      /* Can checksum TCP/UDP over IPV6 */
 445 #define NETIF_F_HIGHDMA         32      /* Can DMA to high memory. */
 446 #define NETIF_F_FRAGLIST        64      /* Scatter/gather IO. */
 447 #define NETIF_F_HW_VLAN_TX      128     /* Transmit VLAN hw acceleration */
 448 #define NETIF_F_HW_VLAN_RX      256     /* Receive VLAN hw acceleration */
 449 #define NETIF_F_HW_VLAN_FILTER  512     /* Receive filtering on VLAN */
 450 #define NETIF_F_VLAN_CHALLENGED 1024    /* Device cannot handle VLAN packets */
 451 #define NETIF_F_GSO             2048    /* Enable software GSO. */
 452 #define NETIF_F_LLTX            4096    /* LockLess TX - deprecated. Please */
 453                                         /* do not use LLTX in new drivers */
 454 #define NETIF_F_NETNS_LOCAL     8192    /* Does not change network namespaces */
 455 #define NETIF_F_MULTI_QUEUE     16384   /* Has multiple TX/RX queues */
 456 #define NETIF_F_LRO             32768   /* large receive offload */
 457
 458         /* Segmentation offload features */
 459 #define NETIF_F_GSO_SHIFT       16
 460 #define NETIF_F_GSO_MASK        0xffff0000
 461 #define NETIF_F_TSO             (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
 462 #define NETIF_F_UFO             (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
 463 #define NETIF_F_GSO_ROBUST      (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
 464 #define NETIF_F_TSO_ECN         (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
 465 #define NETIF_F_TSO6            (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
 466
 467         /* List of features with software fallbacks. */
 468 #define NETIF_F_GSO_SOFTWARE    (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
 469
 470
 471 #define NETIF_F_GEN_CSUM        (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
 472 #define NETIF_F_V4_CSUM         (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
 473 #define NETIF_F_V6_CSUM         (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
 474 #define NETIF_F_ALL_CSUM        (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
 475
 476         struct net_device       *next_sched;
 477
 478         /* Interface index. Unique device identifier    */
 479         int                     ifindex;
 480         int                     iflink;
 481
 482
 483         struct net_device_stats* (*get_stats)(struct net_device *dev);
 484         struct net_device_stats stats;
 485
 486 #ifdef CONFIG_WIRELESS_EXT
 487         /* List of functions to handle Wireless Extensions (instead of ioctl).
 488          * See <net/iw_handler.h> for details. Jean II */
 489         const struct iw_handler_def *   wireless_handlers;
 490         /* Instance data managed by the core of Wireless Extensions. */
 491         struct iw_public_data * wireless_data;
 492 #endif
 493         const struct ethtool_ops *ethtool_ops;
 494
 495         /*
 496          * This marks the end of the "visible" part of the structure. All
 497          * fields hereafter are internal to the system, and may change at
 498          * will (read: may be cleaned up at will).
 499          */
 500
 501
 502         unsigned int            flags;  /* interface flags (a la BSD)   */
 503         unsigned short          gflags;
 504         unsigned short          priv_flags; /* Like 'flags' but invisible to userspace. */
 505         unsigned short          padded; /* How much padding added by alloc_netdev() */
 506
 507         unsigned char           operstate; /* RFC2863 operstate */
 508         unsigned char           link_mode; /* mapping policy to operstate */
 509
 510         unsigned                mtu;    /* interface MTU value          */
 511         unsigned short          type;   /* interface hardware type      */
 512         unsigned short          hard_header_len;        /* hardware hdr length  */
 513
 514         struct net_device       *master; /* Pointer to master device of a group,
 515                                           * which this device is member of.
 516                                           */
 517
 518         /* Interface address info. */
 519         unsigned char           perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
 520         unsigned char           addr_len;       /* hardware address length      */
 521         unsigned short          dev_id;         /* for shared network cards */
 522
 523         struct dev_addr_list    *uc_list;       /* Secondary unicast mac addresses */
 524         int                     uc_count;       /* Number of installed ucasts   */
 525         int                     uc_promisc;
 526         struct dev_addr_list    *mc_list;       /* Multicast mac addresses      */
 527         int                     mc_count;       /* Number of installed mcasts   */
 528         int                     promiscuity;
 529         int                     allmulti;
 530
 531
 532         /* Protocol specific pointers */
 533
 534         void                    *atalk_ptr;     /* AppleTalk link       */
 535         void                    *ip_ptr;        /* IPv4 specific data   */
 536         void                    *dn_ptr;        /* DECnet specific data */
 537         void                    *ip6_ptr;       /* IPv6 specific data */
 538         void                    *ec_ptr;        /* Econet specific data */
 539         void                    *ax25_ptr;      /* AX.25 specific data */
 540         struct wireless_dev     *ieee80211_ptr; /* IEEE 802.11 specific data,
 541                                                    assign before registering */
 542
 543 /*
 544  * Cache line mostly used on receive path (including eth_type_trans())
 545  */
 546         unsigned long           last_rx;        /* Time of last Rx      */
 547         /* Interface address info used in eth_type_trans() */
 548         unsigned char           dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast
 549                                                         because most packets are unicast) */
 550
 551         unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
 552
 553 /*
 554  * Cache line mostly used on queue transmit path (qdisc)
 555  */
 556         /* device queue lock */
 557         spinlock_t              queue_lock ____cacheline_aligned_in_smp;
 558         struct Qdisc            *qdisc;
 559         struct Qdisc            *qdisc_sleeping;
 560         struct list_head        qdisc_list;
 561         unsigned long           tx_queue_len;   /* Max frames per queue allowed */
 562
 563         /* Partially transmitted GSO packet. */
 564         struct sk_buff          *gso_skb;
 565
 566         /* ingress path synchronizer */
 567         spinlock_t              ingress_lock;
 568         struct Qdisc            *qdisc_ingress;
 569
 570 /*
 571  * One part is mostly used on xmit path (device)
 572  */
 573         /* hard_start_xmit synchronizer */
 574         spinlock_t              _xmit_lock ____cacheline_aligned_in_smp;
 575         /* cpu id of processor entered to hard_start_xmit or -1,
 576            if nobody entered there.
 577          */
 578         int                     xmit_lock_owner;
 579         void                    *priv;  /* pointer to private data      */
 580         int                     (*hard_start_xmit) (struct sk_buff *skb,
 581                                                     struct net_device *dev);
 582         /* These may be needed for future network-power-down code. */
 583         unsigned long           trans_start;    /* Time (in jiffies) of last Tx */
 584
 585         int                     watchdog_timeo; /* used by dev_watchdog() */
 586         struct timer_list       watchdog_timer;
 587
 588 /*
 589  * refcnt is a very hot point, so align it on SMP
 590  */
 591         /* Number of references to this device */
 592         atomic_t                refcnt ____cacheline_aligned_in_smp;
 593
 594         /* delayed register/unregister */
 595         struct list_head        todo_list;
 596         /* device index hash chain */
 597         struct hlist_node       index_hlist;
 598
 599         struct net_device       *link_watch_next;
 600
 601         /* register/unregister state machine */
 602         enum { NETREG_UNINITIALIZED=0,
 603                NETREG_REGISTERED,       /* completed register_netdevice */
 604                NETREG_UNREGISTERING,    /* called unregister_netdevice */
 605                NETREG_UNREGISTERED,     /* completed unregister todo */
 606                NETREG_RELEASED,         /* called free_netdev */
 607         } reg_state;
 608
 609         /* Called after device is detached from network. */
 610         void                    (*uninit)(struct net_device *dev);
 611         /* Called after last user reference disappears. */
 612         void                    (*destructor)(struct net_device *dev);
 613
 614         /* Pointers to interface service routines.      */
 615         int                     (*open)(struct net_device *dev);
 616         int                     (*stop)(struct net_device *dev);
 617 #define HAVE_NETDEV_POLL
 618         int                     (*hard_header) (struct sk_buff *skb,
 619                                                 struct net_device *dev,
 620                                                 unsigned short type,
 621                                                 void *daddr,
 622                                                 void *saddr,
 623                                                 unsigned len);
 624         int                     (*rebuild_header)(struct sk_buff *skb);
 625 #define HAVE_CHANGE_RX_FLAGS
 626         void                    (*change_rx_flags)(struct net_device *dev,
 627                                                    int flags);
 628 #define HAVE_SET_RX_MODE
 629         void                    (*set_rx_mode)(struct net_device *dev);
 630 #define HAVE_MULTICAST
 631         void                    (*set_multicast_list)(struct net_device *dev);
 632 #define HAVE_SET_MAC_ADDR
 633         int                     (*set_mac_address)(struct net_device *dev,
 634                                                    void *addr);
 635 #define HAVE_PRIVATE_IOCTL
 636         int                     (*do_ioctl)(struct net_device *dev,
 637                                             struct ifreq *ifr, int cmd);
 638 #define HAVE_SET_CONFIG
 639         int                     (*set_config)(struct net_device *dev,
 640                                               struct ifmap *map);
 641 #define HAVE_HEADER_CACHE
 642         int                     (*hard_header_cache)(struct neighbour *neigh,
 643                                                      struct hh_cache *hh);
 644         void                    (*header_cache_update)(struct hh_cache *hh,
 645                                                        struct net_device *dev,
 646                                                        unsigned char *  haddr);
 647 #define HAVE_CHANGE_MTU
 648         int                     (*change_mtu)(struct net_device *dev, int new_mtu);
 649
 650 #define HAVE_TX_TIMEOUT
 651         void                    (*tx_timeout) (struct net_device *dev);
 652
 653         void                    (*vlan_rx_register)(struct net_device *dev,
 654                                                     struct vlan_group *grp);
 655         void                    (*vlan_rx_add_vid)(struct net_device *dev,
 656                                                    unsigned short vid);
 657         void                    (*vlan_rx_kill_vid)(struct net_device *dev,
 658                                                     unsigned short vid);
 659
 660         int                     (*hard_header_parse)(struct sk_buff *skb,
 661                                                      unsigned char *haddr);
 662         int                     (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
 663 #ifdef CONFIG_NETPOLL
 664         struct netpoll_info     *npinfo;
 665 #endif
 666 #ifdef CONFIG_NET_POLL_CONTROLLER
 667         void                    (*poll_controller)(struct net_device *dev);
 668 #endif
 669
 670         /* Network namespace this network device is inside */
 671         struct net              *nd_net;
 672
 673         /* bridge stuff */
 674         struct net_bridge_port  *br_port;
 675         /* macvlan */
 676         struct macvlan_port     *macvlan_port;
 677
 678         /* class/net/name entry */
 679         struct device           dev;
 680         /* space for optional statistics and wireless sysfs groups */
 681         struct attribute_group  *sysfs_groups[3];
 682
 683         /* rtnetlink link ops */
 684         const struct rtnl_link_ops *rtnl_link_ops;
 685
 686         /* The TX queue control structures */
 687         unsigned int                    egress_subqueue_count;
 688         struct net_device_subqueue      egress_subqueue[1];
 689 };
 690 #define to_net_dev(d) container_of(d, struct net_device, dev)
 691
 692 #define NETDEV_ALIGN            32
 693 #define NETDEV_ALIGN_CONST      (NETDEV_ALIGN - 1)
 694
 695 /**
 696  *      netdev_priv - access network device private data
 697  *      @dev: network device
 698  *
 699  * Get network device private data
 700  */
 701 static inline void *netdev_priv(const struct net_device *dev)
 702 {
 703         return dev->priv;
 704 }
 705
 706 /* Set the sysfs physical device reference for the network logical device
 707  * if set prior to registration will cause a symlink during initialization.
 708  */
 709 #define SET_NETDEV_DEV(net, pdev)       ((net)->dev.parent = (pdev))
 710
 711 static inline void netif_napi_add(struct net_device *dev,
 712                                   struct napi_struct *napi,
 713                                   int (*poll)(struct napi_struct *, int),
 714                                   int weight)
 715 {
 716         INIT_LIST_HEAD(&napi->poll_list);
 717         napi->poll = poll;
 718         napi->weight = weight;
 719 #ifdef CONFIG_NETPOLL
 720         napi->dev = dev;
 721         list_add(&napi->dev_list, &dev->napi_list);
 722         spin_lock_init(&napi->poll_lock);
 723         napi->poll_owner = -1;
 724 #endif
 725         set_bit(NAPI_STATE_SCHED, &napi->state);
 726 }
 727
 728 struct packet_type {
 729         __be16                  type;   /* This is really htons(ether_type). */
 730         struct net_device       *dev;   /* NULL is wildcarded here           */
 731         int                     (*func) (struct sk_buff *,
 732                                          struct net_device *,
 733                                          struct packet_type *,
 734                                          struct net_device *);
 735         struct sk_buff          *(*gso_segment)(struct sk_buff *skb,
 736                                                 int features);
 737         int                     (*gso_send_check)(struct sk_buff *skb);
 738         void                    *af_packet_priv;
 739         struct list_head        list;
 740 };
 741
 742 #include <linux/interrupt.h>
 743 #include <linux/notifier.h>
 744
 745 extern struct net_device                *loopback_dev;          /* The loopback */
 746 extern rwlock_t                         dev_base_lock;          /* Device list lock */
 747
 748
 749 #define for_each_netdev(net, d)         \
 750                 list_for_each_entry(d, &(net)->dev_base_head, dev_list)
 751 #define for_each_netdev_safe(net, d, n) \
 752                 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
 753 #define for_each_netdev_continue(net, d)                \
 754                 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
 755 #define net_device_entry(lh)    list_entry(lh, struct net_device, dev_list)
 756
 757 static inline struct net_device *next_net_device(struct net_device *dev)
 758 {
 759         struct list_head *lh;
 760         struct net *net;
 761
 762         net = dev->nd_net;
 763         lh = dev->dev_list.next;
 764         return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
 765 }
 766
 767 static inline struct net_device *first_net_device(struct net *net)
 768 {
 769         return list_empty(&net->dev_base_head) ? NULL :
 770                 net_device_entry(net->dev_base_head.next);
 771 }
 772
 773 extern int                      netdev_boot_setup_check(struct net_device *dev);
 774 extern unsigned long            netdev_boot_base(const char *prefix, int unit);
 775 extern struct net_device    *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr);
 776 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
 777 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
 778 extern void             dev_add_pack(struct packet_type *pt);
 779 extern void             dev_remove_pack(struct packet_type *pt);
 780 extern void             __dev_remove_pack(struct packet_type *pt);
 781
 782 extern struct net_device        *dev_get_by_flags(struct net *net, unsigned short flags,
 783                                                   unsigned short mask);
 784 extern struct net_device        *dev_get_by_name(struct net *net, const char *name);
 785 extern struct net_device        *__dev_get_by_name(struct net *net, const char *name);
 786 extern int              dev_alloc_name(struct net_device *dev, const char *name);
 787 extern int              dev_open(struct net_device *dev);
 788 extern int              dev_close(struct net_device *dev);
 789 extern int              dev_queue_xmit(struct sk_buff *skb);
 790 extern int              register_netdevice(struct net_device *dev);
 791 extern void             unregister_netdevice(struct net_device *dev);
 792 extern void             free_netdev(struct net_device *dev);
 793 extern void             synchronize_net(void);
 794 extern int              register_netdevice_notifier(struct notifier_block *nb);
 795 extern int              unregister_netdevice_notifier(struct notifier_block *nb);
 796 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
 797 extern struct net_device        *dev_get_by_index(struct net *net, int ifindex);
 798 extern struct net_device        *__dev_get_by_index(struct net *net, int ifindex);
 799 extern int              dev_restart(struct net_device *dev);
 800 #ifdef CONFIG_NETPOLL_TRAP
 801 extern int              netpoll_trap(void);
 802 #endif
 803
 804 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
 805 extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
 806 static inline int unregister_gifconf(unsigned int family)
 807 {
 808         return register_gifconf(family, NULL);
 809 }
 810
 811 /*
 812  * Incoming packets are placed on per-cpu queues so that
 813  * no locking is needed.
 814  */
 815 struct softnet_data
 816 {
 817         struct net_device       *output_queue;
 818         struct sk_buff_head     input_pkt_queue;
 819         struct list_head        poll_list;
 820         struct sk_buff          *completion_queue;
 821
 822         struct napi_struct      backlog;
 823 #ifdef CONFIG_NET_DMA
 824         struct dma_chan         *net_dma;
 825 #endif
 826 };
 827
 828 DECLARE_PER_CPU(struct softnet_data,softnet_data);
 829
 830 #define HAVE_NETIF_QUEUE
 831
 832 extern void __netif_schedule(struct net_device *dev);
 833
 834 static inline void netif_schedule(struct net_device *dev)
 835 {
 836         if (!test_bit(__LINK_STATE_XOFF, &dev->state))
 837                 __netif_schedule(dev);
 838 }
 839
 840 /**
 841  *      netif_start_queue - allow transmit
 842  *      @dev: network device
 843  *
 844  *      Allow upper layers to call the device hard_start_xmit routine.
 845  */
 846 static inline void netif_start_queue(struct net_device *dev)
 847 {
 848         clear_bit(__LINK_STATE_XOFF, &dev->state);
 849 }
 850
 851 /**
 852  *      netif_wake_queue - restart transmit
 853  *      @dev: network device
 854  *
 855  *      Allow upper layers to call the device hard_start_xmit routine.
 856  *      Used for flow control when transmit resources are available.
 857  */
 858 static inline void netif_wake_queue(struct net_device *dev)
 859 {
 860 #ifdef CONFIG_NETPOLL_TRAP
 861         if (netpoll_trap()) {
 862                 clear_bit(__LINK_STATE_XOFF, &dev->state);
 863                 return;
 864         }
 865 #endif
 866         if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
 867                 __netif_schedule(dev);
 868 }
 869
 870 /**
 871  *      netif_stop_queue - stop transmitted packets
 872  *      @dev: network device
 873  *
 874  *      Stop upper layers calling the device hard_start_xmit routine.
 875  *      Used for flow control when transmit resources are unavailable.
 876  */
 877 static inline void netif_stop_queue(struct net_device *dev)
 878 {
 879         set_bit(__LINK_STATE_XOFF, &dev->state);
 880 }
 881
 882 /**
 883  *      netif_queue_stopped - test if transmit queue is flowblocked
 884  *      @dev: network device
 885  *
 886  *      Test if transmit queue on device is currently unable to send.
 887  */
 888 static inline int netif_queue_stopped(const struct net_device *dev)
 889 {
 890         return test_bit(__LINK_STATE_XOFF, &dev->state);
 891 }
 892
 893 /**
 894  *      netif_running - test if up
 895  *      @dev: network device
 896  *
 897  *      Test if the device has been brought up.
 898  */
 899 static inline int netif_running(const struct net_device *dev)
 900 {
 901         return test_bit(__LINK_STATE_START, &dev->state);
 902 }
 903
 904 /*
 905  * Routines to manage the subqueues on a device.  We only need start
 906  * stop, and a check if it's stopped.  All other device management is
 907  * done at the overall netdevice level.
 908  * Also test the device if we're multiqueue.
 909  */
 910
 911 /**
 912  *      netif_start_subqueue - allow sending packets on subqueue
 913  *      @dev: network device
 914  *      @queue_index: sub queue index
 915  *
 916  * Start individual transmit queue of a device with multiple transmit queues.
 917  */
 918 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
 919 {
 920 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
 921         clear_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state);
 922 #endif
 923 }
 924
 925 /**
 926  *      netif_stop_subqueue - stop sending packets on subqueue
 927  *      @dev: network device
 928  *      @queue_index: sub queue index
 929  *
 930  * Stop individual transmit queue of a device with multiple transmit queues.
 931  */
 932 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
 933 {
 934 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
 935 #ifdef CONFIG_NETPOLL_TRAP
 936         if (netpoll_trap())
 937                 return;
 938 #endif
 939         set_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state);
 940 #endif
 941 }
 942
 943 /**
 944  *      netif_subqueue_stopped - test status of subqueue
 945  *      @dev: network device
 946  *      @queue_index: sub queue index
 947  *
 948  * Check individual transmit queue of a device with multiple transmit queues.
 949  */
 950 static inline int netif_subqueue_stopped(const struct net_device *dev,
 951                                          u16 queue_index)
 952 {
 953 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
 954         return test_bit(__LINK_STATE_XOFF,
 955                         &dev->egress_subqueue[queue_index].state);
 956 #else
 957         return 0;
 958 #endif
 959 }
 960
 961
 962 /**
 963  *      netif_wake_subqueue - allow sending packets on subqueue
 964  *      @dev: network device
 965  *      @queue_index: sub queue index
 966  *
 967  * Resume individual transmit queue of a device with multiple transmit queues.
 968  */
 969 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
 970 {
 971 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
 972 #ifdef CONFIG_NETPOLL_TRAP
 973         if (netpoll_trap())
 974                 return;
 975 #endif
 976         if (test_and_clear_bit(__LINK_STATE_XOFF,
 977                                &dev->egress_subqueue[queue_index].state))
 978                 __netif_schedule(dev);
 979 #endif
 980 }
 981
 982 /**
 983  *      netif_is_multiqueue - test if device has multiple transmit queues
 984  *      @dev: network device
 985  *
 986  * Check if device has multiple transmit queues
 987  * Always falls if NETDEVICE_MULTIQUEUE is not configured
 988  */
 989 static inline int netif_is_multiqueue(const struct net_device *dev)
 990 {
 991 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
 992         return (!!(NETIF_F_MULTI_QUEUE & dev->features));
 993 #else
 994         return 0;
 995 #endif
 996 }
 997
 998 /* Use this variant when it is known for sure that it
 999  * is executing from interrupt context.
1000  */
1001 extern void dev_kfree_skb_irq(struct sk_buff *skb);
1002
1003 /* Use this variant in places where it could be invoked
1004  * either from interrupt or non-interrupt context.
1005  */
1006 extern void dev_kfree_skb_any(struct sk_buff *skb);
1007
1008 #define HAVE_NETIF_RX 1
1009 extern int              netif_rx(struct sk_buff *skb);
1010 extern int              netif_rx_ni(struct sk_buff *skb);
1011 #define HAVE_NETIF_RECEIVE_SKB 1
1012 extern int              netif_receive_skb(struct sk_buff *skb);
1013 extern int              dev_valid_name(const char *name);
1014 extern int              dev_ioctl(struct net *net, unsigned int cmd, void __user *);
1015 extern int              dev_ethtool(struct net *net, struct ifreq *);
1016 extern unsigned         dev_get_flags(const struct net_device *);
1017 extern int              dev_change_flags(struct net_device *, unsigned);
1018 extern int              dev_change_name(struct net_device *, char *);
1019 extern int              dev_change_net_namespace(struct net_device *,
1020                                                  struct net *, const char *);
1021 extern int              dev_set_mtu(struct net_device *, int);
1022 extern int              dev_set_mac_address(struct net_device *,
1023                                             struct sockaddr *);
1024 extern int              dev_hard_start_xmit(struct sk_buff *skb,
1025                                             struct net_device *dev);
1026
1027 extern int              netdev_budget;
1028
1029 /* Called by rtnetlink.c:rtnl_unlock() */
1030 extern void netdev_run_todo(void);
1031
1032 /**
1033  *      dev_put - release reference to device
1034  *      @dev: network device
1035  *
1036  * Hold reference to device to keep it from being freed.
1037  */
1038 static inline void dev_put(struct net_device *dev)
1039 {
1040         atomic_dec(&dev->refcnt);
1041 }
1042
1043 /**
1044  *      dev_hold - get reference to device
1045  *      @dev: network device
1046  *
1047  * Release reference to device to allow it to be freed.
1048  */
1049 static inline void dev_hold(struct net_device *dev)
1050 {
1051         atomic_inc(&dev->refcnt);
1052 }
1053
1054 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
1055  * and _off may be called from IRQ context, but it is caller
1056  * who is responsible for serialization of these calls.
1057  *
1058  * The name carrier is inappropriate, these functions should really be
1059  * called netif_lowerlayer_*() because they represent the state of any
1060  * kind of lower layer not just hardware media.
1061  */
1062
1063 extern void linkwatch_fire_event(struct net_device *dev);
1064
1065 /**
1066  *      netif_carrier_ok - test if carrier present
1067  *      @dev: network device
1068  *
1069  * Check if carrier is present on device
1070  */
1071 static inline int netif_carrier_ok(const struct net_device *dev)
1072 {
1073         return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
1074 }
1075
1076 extern void __netdev_watchdog_up(struct net_device *dev);
1077
1078 extern void netif_carrier_on(struct net_device *dev);
1079
1080 extern void netif_carrier_off(struct net_device *dev);
1081
1082 /**
1083  *      netif_dormant_on - mark device as dormant.
1084  *      @dev: network device
1085  *
1086  * Mark device as dormant (as per RFC2863).
1087  *
1088  * The dormant state indicates that the relevant interface is not
1089  * actually in a condition to pass packets (i.e., it is not 'up') but is
1090  * in a "pending" state, waiting for some external event.  For "on-
1091  * demand" interfaces, this new state identifies the situation where the
1092  * interface is waiting for events to place it in the up state.
1093  *
1094  */
1095 static inline void netif_dormant_on(struct net_device *dev)
1096 {
1097         if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
1098                 linkwatch_fire_event(dev);
1099 }
1100
1101 /**
1102  *      netif_dormant_off - set device as not dormant.
1103  *      @dev: network device
1104  *
1105  * Device is not in dormant state.
1106  */
1107 static inline void netif_dormant_off(struct net_device *dev)
1108 {
1109         if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
1110                 linkwatch_fire_event(dev);
1111 }
1112
1113 /**
1114  *      netif_dormant - test if carrier present
1115  *      @dev: network device
1116  *
1117  * Check if carrier is present on device
1118  */
1119 static inline int netif_dormant(const struct net_device *dev)
1120 {
1121         return test_bit(__LINK_STATE_DORMANT, &dev->state);
1122 }
1123
1124
1125 /**
1126  *      netif_oper_up - test if device is operational
1127  *      @dev: network device
1128  *
1129  * Check if carrier is operational
1130  */
1131 static inline int netif_oper_up(const struct net_device *dev) {
1132         return (dev->operstate == IF_OPER_UP ||
1133                 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
1134 }
1135
1136 /**
1137  *      netif_device_present - is device available or removed
1138  *      @dev: network device
1139  *
1140  * Check if device has not been removed from system.
1141  */
1142 static inline int netif_device_present(struct net_device *dev)
1143 {
1144         return test_bit(__LINK_STATE_PRESENT, &dev->state);
1145 }
1146
1147 extern void netif_device_detach(struct net_device *dev);
1148
1149 extern void netif_device_attach(struct net_device *dev);
1150
1151 /*
1152  * Network interface message level settings
1153  */
1154 #define HAVE_NETIF_MSG 1
1155
1156 enum {
1157         NETIF_MSG_DRV           = 0x0001,
1158         NETIF_MSG_PROBE         = 0x0002,
1159         NETIF_MSG_LINK          = 0x0004,
1160         NETIF_MSG_TIMER         = 0x0008,
1161         NETIF_MSG_IFDOWN        = 0x0010,
1162         NETIF_MSG_IFUP          = 0x0020,
1163         NETIF_MSG_RX_ERR        = 0x0040,
1164         NETIF_MSG_TX_ERR        = 0x0080,
1165         NETIF_MSG_TX_QUEUED     = 0x0100,
1166         NETIF_MSG_INTR          = 0x0200,
1167         NETIF_MSG_TX_DONE       = 0x0400,
1168         NETIF_MSG_RX_STATUS     = 0x0800,
1169         NETIF_MSG_PKTDATA       = 0x1000,
1170         NETIF_MSG_HW            = 0x2000,
1171         NETIF_MSG_WOL           = 0x4000,
1172 };
1173
1174 #define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
1175 #define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
1176 #define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
1177 #define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
1178 #define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
1179 #define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
1180 #define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
1181 #define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
1182 #define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
1183 #define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
1184 #define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
1185 #define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
1186 #define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
1187 #define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
1188 #define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
1189
1190 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
1191 {
1192         /* use default */
1193         if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
1194                 return default_msg_enable_bits;
1195         if (debug_value == 0)   /* no output */
1196                 return 0;
1197         /* set low N bits */
1198         return (1 << debug_value) - 1;
1199 }
1200
1201 /* Test if receive needs to be scheduled but only if up */
1202 static inline int netif_rx_schedule_prep(struct net_device *dev,
1203                                          struct napi_struct *napi)
1204 {
1205         return netif_running(dev) && napi_schedule_prep(napi);
1206 }
1207
1208 /* Add interface to tail of rx poll list. This assumes that _prep has
1209  * already been called and returned 1.
1210  */
1211 static inline void __netif_rx_schedule(struct net_device *dev,
1212                                        struct napi_struct *napi)
1213 {
1214         dev_hold(dev);
1215         __napi_schedule(napi);
1216 }
1217
1218 /* Try to reschedule poll. Called by irq handler. */
1219
1220 static inline void netif_rx_schedule(struct net_device *dev,
1221                                      struct napi_struct *napi)
1222 {
1223         if (netif_rx_schedule_prep(dev, napi))
1224                 __netif_rx_schedule(dev, napi);
1225 }
1226
1227 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().  */
1228 static inline int netif_rx_reschedule(struct net_device *dev,
1229                                       struct napi_struct *napi)
1230 {
1231         if (napi_schedule_prep(napi)) {
1232                 __netif_rx_schedule(dev, napi);
1233                 return 1;
1234         }
1235         return 0;
1236 }
1237
1238 /* same as netif_rx_complete, except that local_irq_save(flags)
1239  * has already been issued
1240  */
1241 static inline void __netif_rx_complete(struct net_device *dev,
1242                                        struct napi_struct *napi)
1243 {
1244         __napi_complete(napi);
1245         dev_put(dev);
1246 }
1247
1248 /* Remove interface from poll list: it must be in the poll list
1249  * on current cpu. This primitive is called by dev->poll(), when
1250  * it completes the work. The device cannot be out of poll list at this
1251  * moment, it is BUG().
1252  */
1253 static inline void netif_rx_complete(struct net_device *dev,
1254                                      struct napi_struct *napi)
1255 {
1256         unsigned long flags;
1257
1258         local_irq_save(flags);
1259         __netif_rx_complete(dev, napi);
1260         local_irq_restore(flags);
1261 }
1262
1263 /**
1264  *      netif_tx_lock - grab network device transmit lock
1265  *      @dev: network device
1266  *
1267  * Get network device transmit lock
1268  */
1269 static inline void __netif_tx_lock(struct net_device *dev, int cpu)
1270 {
1271         spin_lock(&dev->_xmit_lock);
1272         dev->xmit_lock_owner = cpu;
1273 }
1274
1275 static inline void netif_tx_lock(struct net_device *dev)
1276 {
1277         __netif_tx_lock(dev, smp_processor_id());
1278 }
1279
1280 static inline void netif_tx_lock_bh(struct net_device *dev)
1281 {
1282         spin_lock_bh(&dev->_xmit_lock);
1283         dev->xmit_lock_owner = smp_processor_id();
1284 }
1285
1286 static inline int netif_tx_trylock(struct net_device *dev)
1287 {
1288         int ok = spin_trylock(&dev->_xmit_lock);
1289         if (likely(ok))
1290                 dev->xmit_lock_owner = smp_processor_id();
1291         return ok;
1292 }
1293
1294 static inline void netif_tx_unlock(struct net_device *dev)
1295 {
1296         dev->xmit_lock_owner = -1;
1297         spin_unlock(&dev->_xmit_lock);
1298 }
1299
1300 static inline void netif_tx_unlock_bh(struct net_device *dev)
1301 {
1302         dev->xmit_lock_owner = -1;
1303         spin_unlock_bh(&dev->_xmit_lock);
1304 }
1305
1306 #define HARD_TX_LOCK(dev, cpu) {                        \
1307         if ((dev->features & NETIF_F_LLTX) == 0) {      \
1308                 __netif_tx_lock(dev, cpu);                      \
1309         }                                               \
1310 }
1311
1312 #define HARD_TX_UNLOCK(dev) {                           \
1313         if ((dev->features & NETIF_F_LLTX) == 0) {      \
1314                 netif_tx_unlock(dev);                   \
1315         }                                               \
1316 }
1317
1318 static inline void netif_tx_disable(struct net_device *dev)
1319 {
1320         netif_tx_lock_bh(dev);
1321         netif_stop_queue(dev);
1322         netif_tx_unlock_bh(dev);
1323 }
1324
1325 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
1326
1327 extern void             ether_setup(struct net_device *dev);
1328
1329 /* Support for loadable net-drivers */
1330 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
1331                                        void (*setup)(struct net_device *),
1332                                        unsigned int queue_count);
1333 #define alloc_netdev(sizeof_priv, name, setup) \
1334         alloc_netdev_mq(sizeof_priv, name, setup, 1)
1335 extern int              register_netdev(struct net_device *dev);
1336 extern void             unregister_netdev(struct net_device *dev);
1337 /* Functions used for secondary unicast and multicast support */
1338 extern void             dev_set_rx_mode(struct net_device *dev);
1339 extern void             __dev_set_rx_mode(struct net_device *dev);
1340 extern int              dev_unicast_delete(struct net_device *dev, void *addr, int alen);
1341 extern int              dev_unicast_add(struct net_device *dev, void *addr, int alen);
1342 extern int              dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
1343 extern int              dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
1344 extern int              dev_mc_sync(struct net_device *to, struct net_device *from);
1345 extern void             dev_mc_unsync(struct net_device *to, struct net_device *from);
1346 extern int              __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all);
1347 extern int              __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly);
1348 extern void             dev_set_promiscuity(struct net_device *dev, int inc);
1349 extern void             dev_set_allmulti(struct net_device *dev, int inc);
1350 extern void             netdev_state_change(struct net_device *dev);
1351 extern void             netdev_features_change(struct net_device *dev);
1352 /* Load a device via the kmod */
1353 extern void             dev_load(struct net *net, const char *name);
1354 extern void             dev_mcast_init(void);
1355 extern int              netdev_max_backlog;
1356 extern int              weight_p;
1357 extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
1358 extern int skb_checksum_help(struct sk_buff *skb);
1359 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
1360 #ifdef CONFIG_BUG
1361 extern void netdev_rx_csum_fault(struct net_device *dev);
1362 #else
1363 static inline void netdev_rx_csum_fault(struct net_device *dev)
1364 {
1365 }
1366 #endif
1367 /* rx skb timestamps */
1368 extern void             net_enable_timestamp(void);
1369 extern void             net_disable_timestamp(void);
1370
1371 #ifdef CONFIG_PROC_FS
1372 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
1373 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
1374 extern void dev_seq_stop(struct seq_file *seq, void *v);
1375 #endif
1376
1377 extern void linkwatch_run_queue(void);
1378
1379 extern int netdev_compute_features(unsigned long all, unsigned long one);
1380
1381 static inline int net_gso_ok(int features, int gso_type)
1382 {
1383         int feature = gso_type << NETIF_F_GSO_SHIFT;
1384         return (features & feature) == feature;
1385 }
1386
1387 static inline int skb_gso_ok(struct sk_buff *skb, int features)
1388 {
1389         return net_gso_ok(features, skb_shinfo(skb)->gso_type);
1390 }
1391
1392 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
1393 {
1394         return skb_is_gso(skb) &&
1395                (!skb_gso_ok(skb, dev->features) ||
1396                 unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
1397 }
1398
1399 /* On bonding slaves other than the currently active slave, suppress
1400  * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
1401  * ARP on active-backup slaves with arp_validate enabled.
1402  */
1403 static inline int skb_bond_should_drop(struct sk_buff *skb)
1404 {
1405         struct net_device *dev = skb->dev;
1406         struct net_device *master = dev->master;
1407
1408         if (master &&
1409             (dev->priv_flags & IFF_SLAVE_INACTIVE)) {
1410                 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
1411                     skb->protocol == __constant_htons(ETH_P_ARP))
1412                         return 0;
1413
1414                 if (master->priv_flags & IFF_MASTER_ALB) {
1415                         if (skb->pkt_type != PACKET_BROADCAST &&
1416                             skb->pkt_type != PACKET_MULTICAST)
1417                                 return 0;
1418                 }
1419                 if (master->priv_flags & IFF_MASTER_8023AD &&
1420                     skb->protocol == __constant_htons(ETH_P_SLOW))
1421                         return 0;
1422
1423                 return 1;
1424         }
1425         return 0;
1426 }
1427
1428 #endif /* __KERNEL__ */
1429
1430 #endif  /* _LINUX_DEV_H */