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