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