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 */
 453 #define NETIF_F_NETNS_LOCAL     8192    /* Does not change network namespaces */
 454 #define NETIF_F_MULTI_QUEUE     16384   /* Has multiple TX/RX queues */
 455 #define NETIF_F_LRO             32768   /* large receive offload */
 456
 457         /* Segmentation offload features */
 458 #define NETIF_F_GSO_SHIFT       16
 459 #define NETIF_F_GSO_MASK        0xffff0000
 460 #define NETIF_F_TSO             (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
 461 #define NETIF_F_UFO             (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
 462 #define NETIF_F_GSO_ROBUST      (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
 463 #define NETIF_F_TSO_ECN         (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
 464 #define NETIF_F_TSO6            (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
 465
 466         /* List of features with software fallbacks. */
 467 #define NETIF_F_GSO_SOFTWARE    (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
 468
 469
 470 #define NETIF_F_GEN_CSUM        (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
 471 #define NETIF_F_V4_CSUM         (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
 472 #define NETIF_F_V6_CSUM         (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
 473 #define NETIF_F_ALL_CSUM        (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
 474
 475         struct net_device       *next_sched;
 476
 477         /* Interface index. Unique device identifier    */
 478         int                     ifindex;
 479         int                     iflink;
 480
 481
 482         struct net_device_stats* (*get_stats)(struct net_device *dev);
 483         struct net_device_stats stats;
 484
 485 #ifdef CONFIG_WIRELESS_EXT
 486         /* List of functions to handle Wireless Extensions (instead of ioctl).
 487          * See <net/iw_handler.h> for details. Jean II */
 488         const struct iw_handler_def *   wireless_handlers;
 489         /* Instance data managed by the core of Wireless Extensions. */
 490         struct iw_public_data * wireless_data;
 491 #endif
 492         const struct ethtool_ops *ethtool_ops;
 493
 494         /*
 495          * This marks the end of the "visible" part of the structure. All
 496          * fields hereafter are internal to the system, and may change at
 497          * will (read: may be cleaned up at will).
 498          */
 499
 500
 501         unsigned int            flags;  /* interface flags (a la BSD)   */
 502         unsigned short          gflags;
 503         unsigned short          priv_flags; /* Like 'flags' but invisible to userspace. */
 504         unsigned short          padded; /* How much padding added by alloc_netdev() */
 505
 506         unsigned char           operstate; /* RFC2863 operstate */
 507         unsigned char           link_mode; /* mapping policy to operstate */
 508
 509         unsigned                mtu;    /* interface MTU value          */
 510         unsigned short          type;   /* interface hardware type      */
 511         unsigned short          hard_header_len;        /* hardware hdr length  */
 512
 513         struct net_device       *master; /* Pointer to master device of a group,
 514                                           * which this device is member of.
 515                                           */
 516
 517         /* Interface address info. */
 518         unsigned char           perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
 519         unsigned char           addr_len;       /* hardware address length      */
 520         unsigned short          dev_id;         /* for shared network cards */
 521
 522         struct dev_addr_list    *uc_list;       /* Secondary unicast mac addresses */
 523         int                     uc_count;       /* Number of installed ucasts   */
 524         int                     uc_promisc;
 525         struct dev_addr_list    *mc_list;       /* Multicast mac addresses      */
 526         int                     mc_count;       /* Number of installed mcasts   */
 527         int                     promiscuity;
 528         int                     allmulti;
 529
 530
 531         /* Protocol specific pointers */
 532
 533         void                    *atalk_ptr;     /* AppleTalk link       */
 534         void                    *ip_ptr;        /* IPv4 specific data   */
 535         void                    *dn_ptr;        /* DECnet specific data */
 536         void                    *ip6_ptr;       /* IPv6 specific data */
 537         void                    *ec_ptr;        /* Econet specific data */
 538         void                    *ax25_ptr;      /* AX.25 specific data */
 539         struct wireless_dev     *ieee80211_ptr; /* IEEE 802.11 specific data,
 540                                                    assign before registering */
 541
 542 /*
 543  * Cache line mostly used on receive path (including eth_type_trans())
 544  */
 545         unsigned long           last_rx;        /* Time of last Rx      */
 546         /* Interface address info used in eth_type_trans() */
 547         unsigned char           dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast
 548                                                         because most packets are unicast) */
 549
 550         unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
 551
 552 /*
 553  * Cache line mostly used on queue transmit path (qdisc)
 554  */
 555         /* device queue lock */
 556         spinlock_t              queue_lock ____cacheline_aligned_in_smp;
 557         struct Qdisc            *qdisc;
 558         struct Qdisc            *qdisc_sleeping;
 559         struct list_head        qdisc_list;
 560         unsigned long           tx_queue_len;   /* Max frames per queue allowed */
 561
 562         /* Partially transmitted GSO packet. */
 563         struct sk_buff          *gso_skb;
 564
 565         /* ingress path synchronizer */
 566         spinlock_t              ingress_lock;
 567         struct Qdisc            *qdisc_ingress;
 568
 569 /*
 570  * One part is mostly used on xmit path (device)
 571  */
 572         /* hard_start_xmit synchronizer */
 573         spinlock_t              _xmit_lock ____cacheline_aligned_in_smp;
 574         /* cpu id of processor entered to hard_start_xmit or -1,
 575            if nobody entered there.
 576          */
 577         int                     xmit_lock_owner;
 578         void                    *priv;  /* pointer to private data      */
 579         int                     (*hard_start_xmit) (struct sk_buff *skb,
 580                                                     struct net_device *dev);
 581         /* These may be needed for future network-power-down code. */
 582         unsigned long           trans_start;    /* Time (in jiffies) of last Tx */
 583
 584         int                     watchdog_timeo; /* used by dev_watchdog() */
 585         struct timer_list       watchdog_timer;
 586
 587 /*
 588  * refcnt is a very hot point, so align it on SMP
 589  */
 590         /* Number of references to this device */
 591         atomic_t                refcnt ____cacheline_aligned_in_smp;
 592
 593         /* delayed register/unregister */
 594         struct list_head        todo_list;
 595         /* device index hash chain */
 596         struct hlist_node       index_hlist;
 597
 598         struct net_device       *link_watch_next;
 599
 600         /* register/unregister state machine */
 601         enum { NETREG_UNINITIALIZED=0,
 602                NETREG_REGISTERED,       /* completed register_netdevice */
 603                NETREG_UNREGISTERING,    /* called unregister_netdevice */
 604                NETREG_UNREGISTERED,     /* completed unregister todo */
 605                NETREG_RELEASED,         /* called free_netdev */
 606         } reg_state;
 607
 608         /* Called after device is detached from network. */
 609         void                    (*uninit)(struct net_device *dev);
 610         /* Called after last user reference disappears. */
 611         void                    (*destructor)(struct net_device *dev);
 612
 613         /* Pointers to interface service routines.      */
 614         int                     (*open)(struct net_device *dev);
 615         int                     (*stop)(struct net_device *dev);
 616 #define HAVE_NETDEV_POLL
 617         int                     (*hard_header) (struct sk_buff *skb,
 618                                                 struct net_device *dev,
 619                                                 unsigned short type,
 620                                                 void *daddr,
 621                                                 void *saddr,
 622                                                 unsigned len);
 623         int                     (*rebuild_header)(struct sk_buff *skb);
 624 #define HAVE_CHANGE_RX_FLAGS
 625         void                    (*change_rx_flags)(struct net_device *dev,
 626                                                    int flags);
 627 #define HAVE_SET_RX_MODE
 628         void                    (*set_rx_mode)(struct net_device *dev);
 629 #define HAVE_MULTICAST
 630         void                    (*set_multicast_list)(struct net_device *dev);
 631 #define HAVE_SET_MAC_ADDR
 632         int                     (*set_mac_address)(struct net_device *dev,
 633                                                    void *addr);
 634 #define HAVE_PRIVATE_IOCTL
 635         int                     (*do_ioctl)(struct net_device *dev,
 636                                             struct ifreq *ifr, int cmd);
 637 #define HAVE_SET_CONFIG
 638         int                     (*set_config)(struct net_device *dev,
 639                                               struct ifmap *map);
 640 #define HAVE_HEADER_CACHE
 641         int                     (*hard_header_cache)(struct neighbour *neigh,
 642                                                      struct hh_cache *hh);
 643         void                    (*header_cache_update)(struct hh_cache *hh,
 644                                                        struct net_device *dev,
 645                                                        unsigned char *  haddr);
 646 #define HAVE_CHANGE_MTU
 647         int                     (*change_mtu)(struct net_device *dev, int new_mtu);
 648
 649 #define HAVE_TX_TIMEOUT
 650         void                    (*tx_timeout) (struct net_device *dev);
 651
 652         void                    (*vlan_rx_register)(struct net_device *dev,
 653                                                     struct vlan_group *grp);
 654         void                    (*vlan_rx_add_vid)(struct net_device *dev,
 655                                                    unsigned short vid);
 656         void                    (*vlan_rx_kill_vid)(struct net_device *dev,
 657                                                     unsigned short vid);
 658
 659         int                     (*hard_header_parse)(struct sk_buff *skb,
 660                                                      unsigned char *haddr);
 661         int                     (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
 662 #ifdef CONFIG_NETPOLL
 663         struct netpoll_info     *npinfo;
 664 #endif
 665 #ifdef CONFIG_NET_POLL_CONTROLLER
 666         void                    (*poll_controller)(struct net_device *dev);
 667 #endif
 668
 669         /* Network namespace this network device is inside */
 670         struct net              *nd_net;
 671
 672         /* bridge stuff */
 673         struct net_bridge_port  *br_port;
 674         /* macvlan */
 675         struct macvlan_port     *macvlan_port;
 676
 677         /* class/net/name entry */
 678         struct device           dev;
 679         /* space for optional statistics and wireless sysfs groups */
 680         struct attribute_group  *sysfs_groups[3];
 681
 682         /* rtnetlink link ops */
 683         const struct rtnl_link_ops *rtnl_link_ops;
 684
 685         /* The TX queue control structures */
 686         unsigned int                    egress_subqueue_count;
 687         struct net_device_subqueue      egress_subqueue[1];
 688 };
 689 #define to_net_dev(d) container_of(d, struct net_device, dev)
 690
 691 #define NETDEV_ALIGN            32
 692 #define NETDEV_ALIGN_CONST      (NETDEV_ALIGN - 1)
 693
 694 /**
 695  *      netdev_priv - access network device private data
 696  *      @dev: network device
 697  *
 698  * Get network device private data
 699  */
 700 static inline void *netdev_priv(const struct net_device *dev)
 701 {
 702         return dev->priv;
 703 }
 704
 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 static inline struct net_device *next_net_device(struct net_device *dev)
 757 {
 758         struct list_head *lh;
 759         struct net *net;
 760
 761         net = dev->nd_net;
 762         lh = dev->dev_list.next;
 763         return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
 764 }
 765
 766 static inline struct net_device *first_net_device(struct net *net)
 767 {
 768         return list_empty(&net->dev_base_head) ? NULL :
 769                 net_device_entry(net->dev_base_head.next);
 770 }
 771
 772 extern int                      netdev_boot_setup_check(struct net_device *dev);
 773 extern unsigned long            netdev_boot_base(const char *prefix, int unit);
 774 extern struct net_device    *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr);
 775 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
 776 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
 777 extern void             dev_add_pack(struct packet_type *pt);
 778 extern void             dev_remove_pack(struct packet_type *pt);
 779 extern void             __dev_remove_pack(struct packet_type *pt);
 780
 781 extern struct net_device        *dev_get_by_flags(struct net *net, unsigned short flags,
 782                                                   unsigned short mask);
 783 extern struct net_device        *dev_get_by_name(struct net *net, const char *name);
 784 extern struct net_device        *__dev_get_by_name(struct net *net, const char *name);
 785 extern int              dev_alloc_name(struct net_device *dev, const char *name);
 786 extern int              dev_open(struct net_device *dev);
 787 extern int              dev_close(struct net_device *dev);
 788 extern int              dev_queue_xmit(struct sk_buff *skb);
 789 extern int              register_netdevice(struct net_device *dev);
 790 extern void             unregister_netdevice(struct net_device *dev);
 791 extern void             free_netdev(struct net_device *dev);
 792 extern void             synchronize_net(void);
 793 extern int              register_netdevice_notifier(struct notifier_block *nb);
 794 extern int              unregister_netdevice_notifier(struct notifier_block *nb);
 795 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
 796 extern struct net_device        *dev_get_by_index(struct net *net, int ifindex);
 797 extern struct net_device        *__dev_get_by_index(struct net *net, int ifindex);
 798 extern int              dev_restart(struct net_device *dev);
 799 #ifdef CONFIG_NETPOLL_TRAP
 800 extern int              netpoll_trap(void);
 801 #endif
 802
 803 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
 804 extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
 805 static inline int unregister_gifconf(unsigned int family)
 806 {
 807         return register_gifconf(family, NULL);
 808 }
 809
 810 /*
 811  * Incoming packets are placed on per-cpu queues so that
 812  * no locking is needed.
 813  */
 814 struct softnet_data
 815 {
 816         struct net_device       *output_queue;
 817         struct sk_buff_head     input_pkt_queue;
 818         struct list_head        poll_list;
 819         struct sk_buff          *completion_queue;
 820
 821         struct napi_struct      backlog;
 822 #ifdef CONFIG_NET_DMA
 823         struct dma_chan         *net_dma;
 824 #endif
 825 };
 826
 827 DECLARE_PER_CPU(struct softnet_data,softnet_data);
 828
 829 #define HAVE_NETIF_QUEUE
 830
 831 extern void __netif_schedule(struct net_device *dev);
 832
 833 static inline void netif_schedule(struct net_device *dev)
 834 {
 835         if (!test_bit(__LINK_STATE_XOFF, &dev->state))
 836                 __netif_schedule(dev);
 837 }
 838
 839 /**
 840  *      netif_start_queue - allow transmit
 841  *      @dev: network device
 842  *
 843  *      Allow upper layers to call the device hard_start_xmit routine.
 844  */
 845 static inline void netif_start_queue(struct net_device *dev)
 846 {
 847         clear_bit(__LINK_STATE_XOFF, &dev->state);
 848 }
 849
 850 /**
 851  *      netif_wake_queue - restart transmit
 852  *      @dev: network device
 853  *
 854  *      Allow upper layers to call the device hard_start_xmit routine.
 855  *      Used for flow control when transmit resources are available.
 856  */
 857 static inline void netif_wake_queue(struct net_device *dev)
 858 {
 859 #ifdef CONFIG_NETPOLL_TRAP
 860         if (netpoll_trap()) {
 861                 clear_bit(__LINK_STATE_XOFF, &dev->state);
 862                 return;
 863         }
 864 #endif
 865         if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
 866                 __netif_schedule(dev);
 867 }
 868
 869 /**
 870  *      netif_stop_queue - stop transmitted packets
 871  *      @dev: network device
 872  *
 873  *      Stop upper layers calling the device hard_start_xmit routine.
 874  *      Used for flow control when transmit resources are unavailable.
 875  */
 876 static inline void netif_stop_queue(struct net_device *dev)
 877 {
 878         set_bit(__LINK_STATE_XOFF, &dev->state);
 879 }
 880
 881 /**
 882  *      netif_queue_stopped - test if transmit queue is flowblocked
 883  *      @dev: network device
 884  *
 885  *      Test if transmit queue on device is currently unable to send.
 886  */
 887 static inline int netif_queue_stopped(const struct net_device *dev)
 888 {
 889         return test_bit(__LINK_STATE_XOFF, &dev->state);
 890 }
 891
 892 /**
 893  *      netif_running - test if up
 894  *      @dev: network device
 895  *
 896  *      Test if the device has been brought up.
 897  */
 898 static inline int netif_running(const struct net_device *dev)
 899 {
 900         return test_bit(__LINK_STATE_START, &dev->state);
 901 }
 902
 903 /*
 904  * Routines to manage the subqueues on a device.  We only need start
 905  * stop, and a check if it's stopped.  All other device management is
 906  * done at the overall netdevice level.
 907  * Also test the device if we're multiqueue.
 908  */
 909
 910 /**
 911  *      netif_start_subqueue - allow sending packets on subqueue
 912  *      @dev: network device
 913  *      @queue_index: sub queue index
 914  *
 915  * Start individual transmit queue of a device with multiple transmit queues.
 916  */
 917 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
 918 {
 919 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
 920         clear_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state);
 921 #endif
 922 }
 923
 924 /**
 925  *      netif_stop_subqueue - stop sending packets on subqueue
 926  *      @dev: network device
 927  *      @queue_index: sub queue index
 928  *
 929  * Stop individual transmit queue of a device with multiple transmit queues.
 930  */
 931 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
 932 {
 933 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
 934 #ifdef CONFIG_NETPOLL_TRAP
 935         if (netpoll_trap())
 936                 return;
 937 #endif
 938         set_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state);
 939 #endif
 940 }
 941
 942 /**
 943  *      netif_subqueue_stopped - test status of subqueue
 944  *      @dev: network device
 945  *      @queue_index: sub queue index
 946  *
 947  * Check individual transmit queue of a device with multiple transmit queues.
 948  */
 949 static inline int netif_subqueue_stopped(const struct net_device *dev,
 950                                          u16 queue_index)
 951 {
 952 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
 953         return test_bit(__LINK_STATE_XOFF,
 954                         &dev->egress_subqueue[queue_index].state);
 955 #else
 956         return 0;
 957 #endif
 958 }
 959
 960
 961 /**
 962  *      netif_wake_subqueue - allow sending packets on subqueue
 963  *      @dev: network device
 964  *      @queue_index: sub queue index
 965  *
 966  * Resume individual transmit queue of a device with multiple transmit queues.
 967  */
 968 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
 969 {
 970 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
 971 #ifdef CONFIG_NETPOLL_TRAP
 972         if (netpoll_trap())
 973                 return;
 974 #endif
 975         if (test_and_clear_bit(__LINK_STATE_XOFF,
 976                                &dev->egress_subqueue[queue_index].state))
 977                 __netif_schedule(dev);
 978 #endif
 979 }
 980
 981 /**
 982  *      netif_is_multiqueue - test if device has multiple transmit queues
 983  *      @dev: network device
 984  *
 985  * Check if device has multiple transmit queues
 986  * Always falls if NETDEVICE_MULTIQUEUE is not configured
 987  */
 988 static inline int netif_is_multiqueue(const struct net_device *dev)
 989 {
 990 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
 991         return (!!(NETIF_F_MULTI_QUEUE & dev->features));
 992 #else
 993         return 0;
 994 #endif
 995 }
 996
 997 /* Use this variant when it is known for sure that it
 998  * is executing from interrupt context.
 999  */
1000 extern void dev_kfree_skb_irq(struct sk_buff *skb);
1001
1002 /* Use this variant in places where it could be invoked
1003  * either from interrupt or non-interrupt context.
1004  */
1005 extern void dev_kfree_skb_any(struct sk_buff *skb);
1006
1007 #define HAVE_NETIF_RX 1
1008 extern int              netif_rx(struct sk_buff *skb);
1009 extern int              netif_rx_ni(struct sk_buff *skb);
1010 #define HAVE_NETIF_RECEIVE_SKB 1
1011 extern int              netif_receive_skb(struct sk_buff *skb);
1012 extern int              dev_valid_name(const char *name);
1013 extern int              dev_ioctl(struct net *net, unsigned int cmd, void __user *);
1014 extern int              dev_ethtool(struct net *net, struct ifreq *);
1015 extern unsigned         dev_get_flags(const struct net_device *);
1016 extern int              dev_change_flags(struct net_device *, unsigned);
1017 extern int              dev_change_name(struct net_device *, char *);
1018 extern int              dev_change_net_namespace(struct net_device *,
1019                                                  struct net *, const char *);
1020 extern int              dev_set_mtu(struct net_device *, int);
1021 extern int              dev_set_mac_address(struct net_device *,
1022                                             struct sockaddr *);
1023 extern int              dev_hard_start_xmit(struct sk_buff *skb,
1024                                             struct net_device *dev);
1025
1026 extern int              netdev_budget;
1027
1028 /* Called by rtnetlink.c:rtnl_unlock() */
1029 extern void netdev_run_todo(void);
1030
1031 /**
1032  *      dev_put - release reference to device
1033  *      @dev: network device
1034  *
1035  * Hold reference to device to keep it from being freed.
1036  */
1037 static inline void dev_put(struct net_device *dev)
1038 {
1039         atomic_dec(&dev->refcnt);
1040 }
1041
1042 /**
1043  *      dev_hold - get reference to device
1044  *      @dev: network device
1045  *
1046  * Release reference to device to allow it to be freed.
1047  */
1048 static inline void dev_hold(struct net_device *dev)
1049 {
1050         atomic_inc(&dev->refcnt);
1051 }
1052
1053 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
1054  * and _off may be called from IRQ context, but it is caller
1055  * who is responsible for serialization of these calls.
1056  *
1057  * The name carrier is inappropriate, these functions should really be
1058  * called netif_lowerlayer_*() because they represent the state of any
1059  * kind of lower layer not just hardware media.
1060  */
1061
1062 extern void linkwatch_fire_event(struct net_device *dev);
1063
1064 /**
1065  *      netif_carrier_ok - test if carrier present
1066  *      @dev: network device
1067  *
1068  * Check if carrier is present on device
1069  */
1070 static inline int netif_carrier_ok(const struct net_device *dev)
1071 {
1072         return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
1073 }
1074
1075 extern void __netdev_watchdog_up(struct net_device *dev);
1076
1077 extern void netif_carrier_on(struct net_device *dev);
1078
1079 extern void netif_carrier_off(struct net_device *dev);
1080
1081 /**
1082  *      netif_dormant_on - mark device as dormant.
1083  *      @dev: network device
1084  *
1085  * Mark device as dormant (as per RFC2863).
1086  *
1087  * The dormant state indicates that the relevant interface is not
1088  * actually in a condition to pass packets (i.e., it is not 'up') but is
1089  * in a "pending" state, waiting for some external event.  For "on-
1090  * demand" interfaces, this new state identifies the situation where the
1091  * interface is waiting for events to place it in the up state.
1092  *
1093  */
1094 static inline void netif_dormant_on(struct net_device *dev)
1095 {
1096         if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
1097                 linkwatch_fire_event(dev);
1098 }
1099
1100 /**
1101  *      netif_dormant_off - set device as not dormant.
1102  *      @dev: network device
1103  *
1104  * Device is not in dormant state.
1105  */
1106 static inline void netif_dormant_off(struct net_device *dev)
1107 {
1108         if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
1109                 linkwatch_fire_event(dev);
1110 }
1111
1112 /**
1113  *      netif_dormant - test if carrier present
1114  *      @dev: network device
1115  *
1116  * Check if carrier is present on device
1117  */
1118 static inline int netif_dormant(const struct net_device *dev)
1119 {
1120         return test_bit(__LINK_STATE_DORMANT, &dev->state);
1121 }
1122
1123
1124 /**
1125  *      netif_oper_up - test if device is operational
1126  *      @dev: network device
1127  *
1128  * Check if carrier is operational
1129  */
1130 static inline int netif_oper_up(const struct net_device *dev) {
1131         return (dev->operstate == IF_OPER_UP ||
1132                 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
1133 }
1134
1135 /**
1136  *      netif_device_present - is device available or removed
1137  *      @dev: network device
1138  *
1139  * Check if device has not been removed from system.
1140  */
1141 static inline int netif_device_present(struct net_device *dev)
1142 {
1143         return test_bit(__LINK_STATE_PRESENT, &dev->state);
1144 }
1145
1146 extern void netif_device_detach(struct net_device *dev);
1147
1148 extern void netif_device_attach(struct net_device *dev);
1149
1150 /*
1151  * Network interface message level settings
1152  */
1153 #define HAVE_NETIF_MSG 1
1154
1155 enum {
1156         NETIF_MSG_DRV           = 0x0001,
1157         NETIF_MSG_PROBE         = 0x0002,
1158         NETIF_MSG_LINK          = 0x0004,
1159         NETIF_MSG_TIMER         = 0x0008,
1160         NETIF_MSG_IFDOWN        = 0x0010,
1161         NETIF_MSG_IFUP          = 0x0020,
1162         NETIF_MSG_RX_ERR        = 0x0040,
1163         NETIF_MSG_TX_ERR        = 0x0080,
1164         NETIF_MSG_TX_QUEUED     = 0x0100,
1165         NETIF_MSG_INTR          = 0x0200,
1166         NETIF_MSG_TX_DONE       = 0x0400,
1167         NETIF_MSG_RX_STATUS     = 0x0800,
1168         NETIF_MSG_PKTDATA       = 0x1000,
1169         NETIF_MSG_HW            = 0x2000,
1170         NETIF_MSG_WOL           = 0x4000,
1171 };
1172
1173 #define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
1174 #define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
1175 #define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
1176 #define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
1177 #define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
1178 #define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
1179 #define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
1180 #define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
1181 #define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
1182 #define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
1183 #define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
1184 #define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
1185 #define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
1186 #define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
1187 #define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
1188
1189 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
1190 {
1191         /* use default */
1192         if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
1193                 return default_msg_enable_bits;
1194         if (debug_value == 0)   /* no output */
1195                 return 0;
1196         /* set low N bits */
1197         return (1 << debug_value) - 1;
1198 }
1199
1200 /* Test if receive needs to be scheduled but only if up */
1201 static inline int netif_rx_schedule_prep(struct net_device *dev,
1202                                          struct napi_struct *napi)
1203 {
1204         return netif_running(dev) && napi_schedule_prep(napi);
1205 }
1206
1207 /* Add interface to tail of rx poll list. This assumes that _prep has
1208  * already been called and returned 1.
1209  */
1210 static inline void __netif_rx_schedule(struct net_device *dev,
1211                                        struct napi_struct *napi)
1212 {
1213         dev_hold(dev);
1214         __napi_schedule(napi);
1215 }
1216
1217 /* Try to reschedule poll. Called by irq handler. */
1218
1219 static inline void netif_rx_schedule(struct net_device *dev,
1220                                      struct napi_struct *napi)
1221 {
1222         if (netif_rx_schedule_prep(dev, napi))
1223                 __netif_rx_schedule(dev, napi);
1224 }
1225
1226 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().  */
1227 static inline int netif_rx_reschedule(struct net_device *dev,
1228                                       struct napi_struct *napi)
1229 {
1230         if (napi_schedule_prep(napi)) {
1231                 __netif_rx_schedule(dev, napi);
1232                 return 1;
1233         }
1234         return 0;
1235 }
1236
1237 /* same as netif_rx_complete, except that local_irq_save(flags)
1238  * has already been issued
1239  */
1240 static inline void __netif_rx_complete(struct net_device *dev,
1241                                        struct napi_struct *napi)
1242 {
1243         __napi_complete(napi);
1244         dev_put(dev);
1245 }
1246
1247 /* Remove interface from poll list: it must be in the poll list
1248  * on current cpu. This primitive is called by dev->poll(), when
1249  * it completes the work. The device cannot be out of poll list at this
1250  * moment, it is BUG().
1251  */
1252 static inline void netif_rx_complete(struct net_device *dev,
1253                                      struct napi_struct *napi)
1254 {
1255         unsigned long flags;
1256
1257         local_irq_save(flags);
1258         __netif_rx_complete(dev, napi);
1259         local_irq_restore(flags);
1260 }
1261
1262 /**
1263  *      netif_tx_lock - grab network device transmit lock
1264  *      @dev: network device
1265  *
1266  * Get network device transmit lock
1267  */
1268 static inline void __netif_tx_lock(struct net_device *dev, int cpu)
1269 {
1270         spin_lock(&dev->_xmit_lock);
1271         dev->xmit_lock_owner = cpu;
1272 }
1273
1274 static inline void netif_tx_lock(struct net_device *dev)
1275 {
1276         __netif_tx_lock(dev, smp_processor_id());
1277 }
1278
1279 static inline void netif_tx_lock_bh(struct net_device *dev)
1280 {
1281         spin_lock_bh(&dev->_xmit_lock);
1282         dev->xmit_lock_owner = smp_processor_id();
1283 }
1284
1285 static inline int netif_tx_trylock(struct net_device *dev)
1286 {
1287         int ok = spin_trylock(&dev->_xmit_lock);
1288         if (likely(ok))
1289                 dev->xmit_lock_owner = smp_processor_id();
1290         return ok;
1291 }
1292
1293 static inline void netif_tx_unlock(struct net_device *dev)
1294 {
1295         dev->xmit_lock_owner = -1;
1296         spin_unlock(&dev->_xmit_lock);
1297 }
1298
1299 static inline void netif_tx_unlock_bh(struct net_device *dev)
1300 {
1301         dev->xmit_lock_owner = -1;
1302         spin_unlock_bh(&dev->_xmit_lock);
1303 }
1304
1305 #define HARD_TX_LOCK(dev, cpu) {                        \
1306         if ((dev->features & NETIF_F_LLTX) == 0) {      \
1307                 __netif_tx_lock(dev, cpu);                      \
1308         }                                               \
1309 }
1310
1311 #define HARD_TX_UNLOCK(dev) {                           \
1312         if ((dev->features & NETIF_F_LLTX) == 0) {      \
1313                 netif_tx_unlock(dev);                   \
1314         }                                               \
1315 }
1316
1317 static inline void netif_tx_disable(struct net_device *dev)
1318 {
1319         netif_tx_lock_bh(dev);
1320         netif_stop_queue(dev);
1321         netif_tx_unlock_bh(dev);
1322 }
1323
1324 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
1325
1326 extern void             ether_setup(struct net_device *dev);
1327
1328 /* Support for loadable net-drivers */
1329 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
1330                                        void (*setup)(struct net_device *),
1331                                        unsigned int queue_count);
1332 #define alloc_netdev(sizeof_priv, name, setup) \
1333         alloc_netdev_mq(sizeof_priv, name, setup, 1)
1334 extern int              register_netdev(struct net_device *dev);
1335 extern void             unregister_netdev(struct net_device *dev);
1336 /* Functions used for secondary unicast and multicast support */
1337 extern void             dev_set_rx_mode(struct net_device *dev);
1338 extern void             __dev_set_rx_mode(struct net_device *dev);
1339 extern int              dev_unicast_delete(struct net_device *dev, void *addr, int alen);
1340 extern int              dev_unicast_add(struct net_device *dev, void *addr, int alen);
1341 extern int              dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
1342 extern int              dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
1343 extern int              dev_mc_sync(struct net_device *to, struct net_device *from);
1344 extern void             dev_mc_unsync(struct net_device *to, struct net_device *from);
1345 extern int              __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all);
1346 extern int              __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly);
1347 extern void             dev_set_promiscuity(struct net_device *dev, int inc);
1348 extern void             dev_set_allmulti(struct net_device *dev, int inc);
1349 extern void             netdev_state_change(struct net_device *dev);
1350 extern void             netdev_features_change(struct net_device *dev);
1351 /* Load a device via the kmod */
1352 extern void             dev_load(struct net *net, const char *name);
1353 extern void             dev_mcast_init(void);
1354 extern int              netdev_max_backlog;
1355 extern int              weight_p;
1356 extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
1357 extern int skb_checksum_help(struct sk_buff *skb);
1358 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
1359 #ifdef CONFIG_BUG
1360 extern void netdev_rx_csum_fault(struct net_device *dev);
1361 #else
1362 static inline void netdev_rx_csum_fault(struct net_device *dev)
1363 {
1364 }
1365 #endif
1366 /* rx skb timestamps */
1367 extern void             net_enable_timestamp(void);
1368 extern void             net_disable_timestamp(void);
1369
1370 #ifdef CONFIG_PROC_FS
1371 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
1372 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
1373 extern void dev_seq_stop(struct seq_file *seq, void *v);
1374 #endif
1375
1376 extern void linkwatch_run_queue(void);
1377
1378 extern int netdev_compute_features(unsigned long all, unsigned long one);
1379
1380 static inline int net_gso_ok(int features, int gso_type)
1381 {
1382         int feature = gso_type << NETIF_F_GSO_SHIFT;
1383         return (features & feature) == feature;
1384 }
1385
1386 static inline int skb_gso_ok(struct sk_buff *skb, int features)
1387 {
1388         return net_gso_ok(features, skb_shinfo(skb)->gso_type);
1389 }
1390
1391 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
1392 {
1393         return skb_is_gso(skb) &&
1394                (!skb_gso_ok(skb, dev->features) ||
1395                 unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
1396 }
1397
1398 /* On bonding slaves other than the currently active slave, suppress
1399  * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
1400  * ARP on active-backup slaves with arp_validate enabled.
1401  */
1402 static inline int skb_bond_should_drop(struct sk_buff *skb)
1403 {
1404         struct net_device *dev = skb->dev;
1405         struct net_device *master = dev->master;
1406
1407         if (master &&
1408             (dev->priv_flags & IFF_SLAVE_INACTIVE)) {
1409                 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
1410                     skb->protocol == __constant_htons(ETH_P_ARP))
1411                         return 0;
1412
1413                 if (master->priv_flags & IFF_MASTER_ALB) {
1414                         if (skb->pkt_type != PACKET_BROADCAST &&
1415                             skb->pkt_type != PACKET_MULTICAST)
1416                                 return 0;
1417                 }
1418                 if (master->priv_flags & IFF_MASTER_8023AD &&
1419                     skb->protocol == __constant_htons(ETH_P_SLOW))
1420                         return 0;
1421
1422                 return 1;
1423         }
1424         return 0;
1425 }
1426
1427 #endif /* __KERNEL__ */
1428
1429 #endif  /* _LINUX_DEV_H */