tools/brcm/K24/hndtools-mipsel-uclibc-4.2.4/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, <bir7@leland.Stanford.Edu>
  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 #include <asm/atomic.h>
  33 #include <asm/cache.h>
  34 #include <asm/byteorder.h>
  35
  36 #ifdef __KERNEL__
  37 #include <linux/config.h>
  38 #ifdef CONFIG_NET_PROFILE
  39 #include <net/profile.h>
  40 #endif
  41
  42 struct divert_blk;
  43 struct vlan_group;
  44 struct ethtool_ops;
  45
  46                                         /* source back-compat hooks */
  47 #define SET_ETHTOOL_OPS(netdev,ops) \
  48         ( (netdev)->ethtool_ops = (ops) )
  49
  50 #define HAVE_ALLOC_NETDEV               /* feature macro: alloc_xxxdev
  51                                            functions are available. */
  52 #define HAVE_FREE_NETDEV                /* free_netdev() */
  53 #define HAVE_NETDEV_PRIV                /* netdev_priv() */
  54
  55 #define NET_XMIT_SUCCESS        0
  56 #define NET_XMIT_DROP           1       /* skb dropped                  */
  57 #define NET_XMIT_CN             2       /* congestion notification      */
  58 #define NET_XMIT_POLICED        3       /* skb is shot by police        */
  59 #define NET_XMIT_BYPASS         4       /* packet does not leave via dequeue;
  60                                            (TC use only - dev_queue_xmit
  61                                            returns this as NET_XMIT_SUCCESS) */
  62
  63 /* Backlog congestion levels */
  64 #define NET_RX_SUCCESS          0   /* keep 'em coming, baby */
  65 #define NET_RX_DROP             1  /* packet dropped */
  66 #define NET_RX_CN_LOW           2   /* storm alert, just in case */
  67 #define NET_RX_CN_MOD           3   /* Storm on its way! */
  68 #define NET_RX_CN_HIGH          4   /* The storm is here */
  69 #define NET_RX_BAD              5  /* packet dropped due to kernel error */
  70
  71 #define net_xmit_errno(e)       ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
  72
  73 #endif
  74
  75 #define MAX_ADDR_LEN    8               /* Largest hardware address length */
  76
  77 /*
  78  *      Compute the worst case header length according to the protocols
  79  *      used.
  80  */
  81
  82 #if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR)
  83 #define LL_MAX_HEADER   32
  84 #else
  85 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
  86 #define LL_MAX_HEADER   96
  87 #else
  88 #define LL_MAX_HEADER   48
  89 #endif
  90 #endif
  91
  92 #if !defined(CONFIG_NET_IPIP) && \
  93     !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE)
  94 #define MAX_HEADER LL_MAX_HEADER
  95 #else
  96 #define MAX_HEADER (LL_MAX_HEADER + 48)
  97 #endif
  98
  99 /*
 100  *      Network device statistics. Akin to the 2.0 ether stats but
 101  *      with byte counters.
 102  */
 103
 104 struct net_device_stats
 105 {
 106         unsigned long   rx_packets;             /* total packets received       */
 107         unsigned long   tx_packets;             /* total packets transmitted    */
 108         unsigned long   rx_bytes;               /* total bytes received         */
 109         unsigned long   tx_bytes;               /* total bytes transmitted      */
 110         unsigned long   rx_errors;              /* bad packets received         */
 111         unsigned long   tx_errors;              /* packet transmit problems     */
 112         unsigned long   rx_dropped;             /* no space in linux buffers    */
 113         unsigned long   tx_dropped;             /* no space available in linux  */
 114         unsigned long   multicast;              /* multicast packets received   */
 115         unsigned long   collisions;
 116
 117         /* detailed rx_errors: */
 118         unsigned long   rx_length_errors;
 119         unsigned long   rx_over_errors;         /* receiver ring buff overflow  */
 120         unsigned long   rx_crc_errors;          /* recved pkt with crc error    */
 121         unsigned long   rx_frame_errors;        /* recv'd frame alignment error */
 122         unsigned long   rx_fifo_errors;         /* recv'r fifo overrun          */
 123         unsigned long   rx_missed_errors;       /* receiver missed packet       */
 124
 125         /* detailed tx_errors */
 126         unsigned long   tx_aborted_errors;
 127         unsigned long   tx_carrier_errors;
 128         unsigned long   tx_fifo_errors;
 129         unsigned long   tx_heartbeat_errors;
 130         unsigned long   tx_window_errors;
 131
 132         /* for cslip etc */
 133         unsigned long   rx_compressed;
 134         unsigned long   tx_compressed;
 135 };
 136
 137
 138 /* Media selection options. */
 139 enum {
 140         IF_PORT_UNKNOWN = 0,
 141         IF_PORT_10BASE2,
 142         IF_PORT_10BASET,
 143         IF_PORT_AUI,
 144         IF_PORT_100BASET,
 145         IF_PORT_100BASETX,
 146         IF_PORT_100BASEFX
 147 };
 148
 149 #ifdef __KERNEL__
 150
 151 extern const char *if_port_text[];
 152
 153 #include <linux/cache.h>
 154 #include <linux/skbuff.h>
 155
 156 struct neighbour;
 157 struct neigh_parms;
 158 struct sk_buff;
 159
 160 struct netif_rx_stats
 161 {
 162         unsigned total;
 163         unsigned dropped;
 164         unsigned time_squeeze;
 165         unsigned throttled;
 166         unsigned fastroute_hit;
 167         unsigned fastroute_success;
 168         unsigned fastroute_defer;
 169         unsigned fastroute_deferred_out;
 170         unsigned fastroute_latency_reduction;
 171         unsigned cpu_collision;
 172 } ____cacheline_aligned;
 173
 174 extern struct netif_rx_stats netdev_rx_stat[];
 175
 176
 177 /*
 178  *      We tag multicasts with these structures.
 179  */
 180
 181 struct dev_mc_list
 182 {
 183         struct dev_mc_list      *next;
 184         __u8                    dmi_addr[MAX_ADDR_LEN];
 185         unsigned char           dmi_addrlen;
 186         int                     dmi_users;
 187         int                     dmi_gusers;
 188 };
 189
 190 struct hh_cache
 191 {
 192         struct hh_cache *hh_next;       /* Next entry                        */
 193         atomic_t        hh_refcnt;      /* number of users                   */
 194         unsigned short  hh_type;        /* protocol identifier, f.e ETH_P_IP
 195                                          *  NOTE:  For VLANs, this will be the
 196                                          *  encapuslated type. --BLG
 197                                          */
 198         int             hh_len;         /* length of header */
 199         int             (*hh_output)(struct sk_buff *skb);
 200         rwlock_t        hh_lock;
 201
 202         /* cached hardware header; allow for machine alignment needs.        */
 203 #define HH_DATA_MOD     16
 204 #define HH_DATA_OFF(__len) \
 205         (HH_DATA_MOD - ((__len) & (HH_DATA_MOD - 1)))
 206 #define HH_DATA_ALIGN(__len) \
 207         (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
 208         unsigned long   hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
 209 };
 210
 211 /* These flag bits are private to the generic network queueing
 212  * layer, they may not be explicitly referenced by any other
 213  * code.
 214  */
 215
 216 enum netdev_state_t
 217 {
 218         __LINK_STATE_XOFF=0,
 219         __LINK_STATE_START,
 220         __LINK_STATE_PRESENT,
 221         __LINK_STATE_SCHED,
 222         __LINK_STATE_NOCARRIER,
 223         __LINK_STATE_RX_SCHED
 224 };
 225
 226
 227 /*
 228  * This structure holds at boot time configured netdevice settings. They
 229  * are then used in the device probing.
 230  */
 231 struct netdev_boot_setup {
 232         char name[IFNAMSIZ];
 233         struct ifmap map;
 234 };
 235 #define NETDEV_BOOT_SETUP_MAX 8
 236
 237
 238 /*
 239  *      The DEVICE structure.
 240  *      Actually, this whole structure is a big mistake.  It mixes I/O
 241  *      data with strictly "high-level" data, and it has to know about
 242  *      almost every data structure used in the INET module.
 243  *
 244  *      FIXME: cleanup struct net_device such that network protocol info
 245  *      moves out.
 246  */
 247
 248 struct net_device
 249 {
 250
 251         /*
 252          * This is the first field of the "visible" part of this structure
 253          * (i.e. as seen by users in the "Space.c" file).  It is the name
 254          * the interface.
 255          */
 256         char                    name[IFNAMSIZ];
 257
 258         /*
 259          *      I/O specific fields
 260          *      FIXME: Merge these and struct ifmap into one
 261          */
 262         unsigned long           rmem_end;       /* shmem "recv" end     */
 263         unsigned long           rmem_start;     /* shmem "recv" start   */
 264         unsigned long           mem_end;        /* shared mem end       */
 265         unsigned long           mem_start;      /* shared mem start     */
 266         unsigned long           base_addr;      /* device I/O address   */
 267         unsigned int            irq;            /* device IRQ number    */
 268
 269         /*
 270          *      Some hardware also needs these fields, but they are not
 271          *      part of the usual set specified in Space.c.
 272          */
 273
 274         unsigned char           if_port;        /* Selectable AUI, TP,..*/
 275         unsigned char           dma;            /* DMA channel          */
 276
 277         unsigned long           state;
 278
 279         struct net_device       *next;
 280
 281         /* The device initialization function. Called only once. */
 282         int                     (*init)(struct net_device *dev);
 283
 284         /* ------- Fields preinitialized in Space.c finish here ------- */
 285
 286         struct net_device       *next_sched;
 287
 288         /* Interface index. Unique device identifier    */
 289         int                     ifindex;
 290         int                     iflink;
 291
 292
 293         struct net_device_stats* (*get_stats)(struct net_device *dev);
 294         struct iw_statistics*   (*get_wireless_stats)(struct net_device *dev);
 295
 296         /* List of functions to handle Wireless Extensions (instead of ioctl).
 297          * See <net/iw_handler.h> for details. Jean II */
 298         const struct iw_handler_def *   wireless_handlers;
 299
 300
 301         /*
 302          * This marks the end of the "visible" part of the structure. All
 303          * fields hereafter are internal to the system, and may change at
 304          * will (read: may be cleaned up at will).
 305          */
 306
 307         /* These may be needed for future network-power-down code. */
 308         unsigned long           trans_start;    /* Time (in jiffies) of last Tx */
 309         unsigned long           last_rx;        /* Time of last Rx      */
 310
 311         unsigned short          flags;  /* interface flags (a la BSD)   */
 312         unsigned short          gflags;
 313         unsigned short          priv_flags; /* Like 'flags' but invisible to userspace. */
 314         unsigned short          unused_alignment_fixer; /* Because we need priv_flags,
 315                                                          * and we want to be 32-bit aligned.
 316                                                          */
 317
 318         unsigned                mtu;    /* interface MTU value          */
 319         unsigned short          type;   /* interface hardware type      */
 320         unsigned short          hard_header_len;        /* hardware hdr length  */
 321         void                    *priv;  /* pointer to private data      */
 322
 323         struct net_device       *master; /* Pointer to master device of a group,
 324                                           * which this device is member of.
 325                                           */
 326
 327         /* Interface address info. */
 328         unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
 329         unsigned char           dev_addr[MAX_ADDR_LEN]; /* hw address   */
 330         unsigned char           addr_len;       /* hardware address length      */
 331
 332         struct dev_mc_list      *mc_list;       /* Multicast mac addresses      */
 333         int                     mc_count;       /* Number of installed mcasts   */
 334         int                     promiscuity;
 335         int                     allmulti;
 336
 337         int                     watchdog_timeo;
 338         struct timer_list       watchdog_timer;
 339
 340         /* Protocol specific pointers */
 341
 342         void                    *atalk_ptr;     /* AppleTalk link       */
 343         void                    *ip_ptr;        /* IPv4 specific data   */
 344         void                    *dn_ptr;        /* DECnet specific data */
 345         void                    *ip6_ptr;       /* IPv6 specific data */
 346         void                    *ec_ptr;        /* Econet specific data */
 347
 348         struct list_head        poll_list;      /* Link to poll list    */
 349         int                     quota;
 350         int                     weight;
 351
 352         struct Qdisc            *qdisc;
 353         struct Qdisc            *qdisc_sleeping;
 354         struct Qdisc            *qdisc_list;
 355         struct Qdisc            *qdisc_ingress;
 356         unsigned long           tx_queue_len;   /* Max frames per queue allowed */
 357
 358         /* hard_start_xmit synchronizer */
 359         spinlock_t              xmit_lock;
 360         /* cpu id of processor entered to hard_start_xmit or -1,
 361            if nobody entered there.
 362          */
 363         int                     xmit_lock_owner;
 364         /* device queue lock */
 365         spinlock_t              queue_lock;
 366         /* Number of references to this device */
 367         atomic_t                refcnt;
 368         /* The flag marking that device is unregistered, but held by an user */
 369         int                     deadbeaf;
 370
 371         /* Net device features */
 372         int                     features;
 373 #define NETIF_F_SG              1       /* Scatter/gather IO. */
 374 #define NETIF_F_IP_CSUM         2       /* Can checksum only TCP/UDP over IPv4. */
 375 #define NETIF_F_NO_CSUM         4       /* Does not require checksum. F.e. loopack. */
 376 #define NETIF_F_HW_CSUM         8       /* Can checksum all the packets. */
 377 #define NETIF_F_DYNALLOC        16      /* Self-dectructable device. */
 378 #define NETIF_F_HIGHDMA         32      /* Can DMA to high memory. */
 379 #define NETIF_F_FRAGLIST        64      /* Scatter/gather IO. */
 380 #define NETIF_F_HW_VLAN_TX      128     /* Transmit VLAN hw acceleration */
 381 #define NETIF_F_HW_VLAN_RX      256     /* Receive VLAN hw acceleration */
 382 #define NETIF_F_HW_VLAN_FILTER  512     /* Receive filtering on VLAN */
 383 #define NETIF_F_VLAN_CHALLENGED 1024    /* Device cannot handle VLAN packets */
 384
 385         /* Called after device is detached from network. */
 386         void                    (*uninit)(struct net_device *dev);
 387         /* Called after last user reference disappears. */
 388         void                    (*destructor)(struct net_device *dev);
 389
 390         /* Pointers to interface service routines.      */
 391         int                     (*open)(struct net_device *dev);
 392         int                     (*stop)(struct net_device *dev);
 393         int                     (*hard_start_xmit) (struct sk_buff *skb,
 394                                                     struct net_device *dev);
 395 #define HAVE_NETDEV_POLL
 396         int                     (*poll) (struct net_device *dev, int *quota);
 397         int                     (*hard_header) (struct sk_buff *skb,
 398                                                 struct net_device *dev,
 399                                                 unsigned short type,
 400                                                 void *daddr,
 401                                                 void *saddr,
 402                                                 unsigned len);
 403         int                     (*rebuild_header)(struct sk_buff *skb);
 404 #define HAVE_MULTICAST
 405         void                    (*set_multicast_list)(struct net_device *dev);
 406 #define HAVE_SET_MAC_ADDR
 407         int                     (*set_mac_address)(struct net_device *dev,
 408                                                    void *addr);
 409 #define HAVE_PRIVATE_IOCTL
 410         int                     (*do_ioctl)(struct net_device *dev,
 411                                             struct ifreq *ifr, int cmd);
 412 #define HAVE_SET_CONFIG
 413         int                     (*set_config)(struct net_device *dev,
 414                                               struct ifmap *map);
 415 #define HAVE_HEADER_CACHE
 416         int                     (*hard_header_cache)(struct neighbour *neigh,
 417                                                      struct hh_cache *hh);
 418         void                    (*header_cache_update)(struct hh_cache *hh,
 419                                                        struct net_device *dev,
 420                                                        unsigned char *  haddr);
 421 #define HAVE_CHANGE_MTU
 422         int                     (*change_mtu)(struct net_device *dev, int new_mtu);
 423
 424 #define HAVE_TX_TIMEOUT
 425         void                    (*tx_timeout) (struct net_device *dev);
 426
 427         void                    (*vlan_rx_register)(struct net_device *dev,
 428                                                     struct vlan_group *grp);
 429         void                    (*vlan_rx_add_vid)(struct net_device *dev,
 430                                                    unsigned short vid);
 431         void                    (*vlan_rx_kill_vid)(struct net_device *dev,
 432                                                     unsigned short vid);
 433
 434         int                     (*hard_header_parse)(struct sk_buff *skb,
 435                                                      unsigned char *haddr);
 436         int                     (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
 437         int                     (*accept_fastpath)(struct net_device *, struct dst_entry*);
 438
 439         /* open/release and usage marking */
 440         struct module *owner;
 441
 442         /* bridge stuff */
 443         struct net_bridge_port  *br_port;
 444
 445 #ifdef CONFIG_NET_FASTROUTE
 446 #define NETDEV_FASTROUTE_HMASK 0xF
 447         /* Semi-private data. Keep it at the end of device struct. */
 448         rwlock_t                fastpath_lock;
 449         struct dst_entry        *fastpath[NETDEV_FASTROUTE_HMASK+1];
 450 #endif
 451 #ifdef CONFIG_NET_DIVERT
 452         /* this will get initialized at each interface type init routine */
 453         struct divert_blk       *divert;
 454 #endif /* CONFIG_NET_DIVERT */
 455         struct ethtool_ops *ethtool_ops;
 456
 457         /* Instance data managed by the core of Wireless Extensions. */
 458         struct iw_public_data * wireless_data;
 459 };
 460
 461 /* 2.6 compatibility */
 462 #define SET_NETDEV_DEV(net, pdev) do { } while (0)
 463
 464 struct packet_type
 465 {
 466         unsigned short          type;   /* This is really htons(ether_type).    */
 467         struct net_device               *dev;   /* NULL is wildcarded here              */
 468         int                     (*func) (struct sk_buff *, struct net_device *,
 469                                          struct packet_type *);
 470         void                    *data;  /* Private to the packet type           */
 471         struct packet_type      *next;
 472 };
 473
 474 static inline void *netdev_priv(struct net_device *dev)
 475 {
 476         return dev->priv;
 477 }
 478
 479 #include <linux/interrupt.h>
 480 #include <linux/notifier.h>
 481
 482 extern struct net_device                loopback_dev;           /* The loopback */
 483 extern struct net_device                *dev_base;              /* All devices */
 484 extern rwlock_t                         dev_base_lock;          /* Device list lock */
 485
 486 extern int                      netdev_boot_setup_add(char *name, struct ifmap *map);
 487 extern int                      netdev_boot_setup_check(struct net_device *dev);
 488 extern struct net_device    *dev_getbyhwaddr(unsigned short type, char *hwaddr);
 489 extern void             dev_add_pack(struct packet_type *pt);
 490 extern void             dev_remove_pack(struct packet_type *pt);
 491 extern int              dev_get(const char *name);
 492 extern struct net_device        *dev_get_by_flags(unsigned short flags,
 493                                         unsigned short mask);
 494 extern struct net_device        *__dev_get_by_flags(unsigned short flags,
 495                                         unsigned short mask);
 496 extern struct net_device        *dev_get_by_name(const char *name);
 497 extern struct net_device        *__dev_get_by_name(const char *name);
 498 extern struct net_device        *dev_alloc(const char *name, int *err);
 499 extern int              dev_alloc_name(struct net_device *dev, const char *name);
 500 extern int              dev_open(struct net_device *dev);
 501 extern int              dev_close(struct net_device *dev);
 502 extern int              dev_queue_xmit(struct sk_buff *skb);
 503 extern int              register_netdevice(struct net_device *dev);
 504 extern int              unregister_netdevice(struct net_device *dev);
 505 extern int              register_netdevice_notifier(struct notifier_block *nb);
 506 extern int              unregister_netdevice_notifier(struct notifier_block *nb);
 507 extern int              dev_new_index(void);
 508 extern struct net_device        *dev_get_by_index(int ifindex);
 509 extern struct net_device        *__dev_get_by_index(int ifindex);
 510 extern int              dev_restart(struct net_device *dev);
 511
 512 typedef int gifconf_func_t(struct net_device * dev, char * bufptr, int len);
 513 extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
 514 static inline int unregister_gifconf(unsigned int family)
 515 {
 516         return register_gifconf(family, 0);
 517 }
 518
 519 /*
 520  * Incoming packets are placed on per-cpu queues so that
 521  * no locking is needed.
 522  */
 523
 524 struct softnet_data
 525 {
 526         int                     throttle;
 527         int                     cng_level;
 528         int                     avg_blog;
 529         struct sk_buff_head     input_pkt_queue;
 530         struct list_head        poll_list;
 531         struct net_device       *output_queue;
 532         struct sk_buff          *completion_queue;
 533
 534         struct net_device       blog_dev;       /* Sorry. 8) */
 535 } ____cacheline_aligned;
 536
 537
 538 extern struct softnet_data softnet_data[NR_CPUS];
 539
 540 #define HAVE_NETIF_QUEUE
 541
 542 static inline void __netif_schedule(struct net_device *dev)
 543 {
 544         if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
 545                 unsigned long flags;
 546                 int cpu = smp_processor_id();
 547
 548                 local_irq_save(flags);
 549                 dev->next_sched = softnet_data[cpu].output_queue;
 550                 softnet_data[cpu].output_queue = dev;
 551                 cpu_raise_softirq(cpu, NET_TX_SOFTIRQ);
 552                 local_irq_restore(flags);
 553         }
 554 }
 555
 556 static inline void netif_schedule(struct net_device *dev)
 557 {
 558         if (!test_bit(__LINK_STATE_XOFF, &dev->state))
 559                 __netif_schedule(dev);
 560 }
 561
 562 static inline void netif_start_queue(struct net_device *dev)
 563 {
 564         clear_bit(__LINK_STATE_XOFF, &dev->state);
 565 }
 566
 567 static inline void netif_wake_queue(struct net_device *dev)
 568 {
 569         if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
 570                 __netif_schedule(dev);
 571 }
 572
 573 static inline void netif_stop_queue(struct net_device *dev)
 574 {
 575         set_bit(__LINK_STATE_XOFF, &dev->state);
 576 }
 577
 578 static inline int netif_queue_stopped(struct net_device *dev)
 579 {
 580         return test_bit(__LINK_STATE_XOFF, &dev->state);
 581 }
 582
 583 static inline int netif_running(struct net_device *dev)
 584 {
 585         return test_bit(__LINK_STATE_START, &dev->state);
 586 }
 587
 588
 589 /* Use this variant when it is known for sure that it
 590  * is executing from interrupt context.
 591  */
 592 static inline void dev_kfree_skb_irq(struct sk_buff *skb)
 593 {
 594         if (atomic_dec_and_test(&skb->users)) {
 595                 int cpu =smp_processor_id();
 596                 unsigned long flags;
 597
 598                 local_irq_save(flags);
 599                 skb->next = softnet_data[cpu].completion_queue;
 600                 softnet_data[cpu].completion_queue = skb;
 601                 cpu_raise_softirq(cpu, NET_TX_SOFTIRQ);
 602                 local_irq_restore(flags);
 603         }
 604 }
 605
 606 /* Use this variant in places where it could be invoked
 607  * either from interrupt or non-interrupt context.
 608  */
 609 static inline void dev_kfree_skb_any(struct sk_buff *skb)
 610 {
 611         if (in_irq())
 612                 dev_kfree_skb_irq(skb);
 613         else
 614                 dev_kfree_skb(skb);
 615 }
 616
 617 #define HAVE_NETIF_RX 1
 618 extern int              netif_rx(struct sk_buff *skb);
 619 #define HAVE_NETIF_RECEIVE_SKB 1
 620 extern int              netif_receive_skb(struct sk_buff *skb);
 621 extern int              dev_ioctl(unsigned int cmd, void *);
 622 extern int              dev_ethtool(struct ifreq *);
 623 extern int              dev_change_flags(struct net_device *, unsigned);
 624 extern void             dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev);
 625
 626 extern void             dev_init(void);
 627
 628 extern int              netdev_nit;
 629
 630 /* Post buffer to the network code from _non interrupt_ context.
 631  * see net/core/dev.c for netif_rx description.
 632  */
 633 static inline int netif_rx_ni(struct sk_buff *skb)
 634 {
 635        int err = netif_rx(skb);
 636        if (softirq_pending(smp_processor_id()))
 637                do_softirq();
 638        return err;
 639 }
 640
 641 static inline void dev_init_buffers(struct net_device *dev)
 642 {
 643         /* WILL BE REMOVED IN 2.5.0 */
 644 }
 645
 646 extern int netdev_finish_unregister(struct net_device *dev);
 647
 648 static inline void dev_put(struct net_device *dev)
 649 {
 650         if (atomic_dec_and_test(&dev->refcnt))
 651                 netdev_finish_unregister(dev);
 652 }
 653
 654 #define __dev_put(dev) atomic_dec(&(dev)->refcnt)
 655 #define dev_hold(dev) atomic_inc(&(dev)->refcnt)
 656
 657 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
 658  * and _off may be called from IRQ context, but it is caller
 659  * who is responsible for serialization of these calls.
 660  */
 661
 662 static inline int netif_carrier_ok(struct net_device *dev)
 663 {
 664         return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
 665 }
 666
 667 extern void __netdev_watchdog_up(struct net_device *dev);
 668
 669 static inline void netif_carrier_on(struct net_device *dev)
 670 {
 671         clear_bit(__LINK_STATE_NOCARRIER, &dev->state);
 672         if (netif_running(dev))
 673                 __netdev_watchdog_up(dev);
 674 }
 675
 676 static inline void netif_carrier_off(struct net_device *dev)
 677 {
 678         set_bit(__LINK_STATE_NOCARRIER, &dev->state);
 679 }
 680
 681 /* Hot-plugging. */
 682 static inline int netif_device_present(struct net_device *dev)
 683 {
 684         return test_bit(__LINK_STATE_PRESENT, &dev->state);
 685 }
 686
 687 static inline void netif_device_detach(struct net_device *dev)
 688 {
 689         if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
 690             netif_running(dev)) {
 691                 netif_stop_queue(dev);
 692         }
 693 }
 694
 695 static inline void netif_device_attach(struct net_device *dev)
 696 {
 697         if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
 698             netif_running(dev)) {
 699                 netif_wake_queue(dev);
 700                 __netdev_watchdog_up(dev);
 701         }
 702 }
 703
 704 /*
 705  * Network interface message level settings
 706  */
 707 #define HAVE_NETIF_MSG 1
 708
 709 enum {
 710         NETIF_MSG_DRV           = 0x0001,
 711         NETIF_MSG_PROBE         = 0x0002,
 712         NETIF_MSG_LINK          = 0x0004,
 713         NETIF_MSG_TIMER         = 0x0008,
 714         NETIF_MSG_IFDOWN        = 0x0010,
 715         NETIF_MSG_IFUP          = 0x0020,
 716         NETIF_MSG_RX_ERR        = 0x0040,
 717         NETIF_MSG_TX_ERR        = 0x0080,
 718         NETIF_MSG_TX_QUEUED     = 0x0100,
 719         NETIF_MSG_INTR          = 0x0200,
 720         NETIF_MSG_TX_DONE       = 0x0400,
 721         NETIF_MSG_RX_STATUS     = 0x0800,
 722         NETIF_MSG_PKTDATA       = 0x1000,
 723         NETIF_MSG_HW            = 0x2000,
 724         NETIF_MSG_WOL           = 0x4000,
 725 };
 726
 727 #define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
 728 #define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
 729 #define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
 730 #define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
 731 #define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
 732 #define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
 733 #define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
 734 #define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
 735 #define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
 736 #define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
 737 #define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
 738 #define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
 739 #define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
 740 #define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
 741 #define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
 742
 743 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
 744 {
 745         /* use default */
 746         if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
 747                 return default_msg_enable_bits;
 748         if (debug_value == 0)   /* no output */
 749                 return 0;
 750         /* set low N bits */
 751         return (1 << debug_value) - 1;
 752 }
 753
 754 /* Schedule rx intr now? */
 755
 756 static inline int netif_rx_schedule_prep(struct net_device *dev)
 757 {
 758         return netif_running(dev) &&
 759                 !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state);
 760 }
 761
 762 /* Add interface to tail of rx poll list. This assumes that _prep has
 763  * already been called and returned 1.
 764  */
 765
 766 static inline void __netif_rx_schedule(struct net_device *dev)
 767 {
 768         unsigned long flags;
 769         int cpu = smp_processor_id();
 770
 771         local_irq_save(flags);
 772         dev_hold(dev);
 773         list_add_tail(&dev->poll_list, &softnet_data[cpu].poll_list);
 774         if (dev->quota < 0)
 775                 dev->quota += dev->weight;
 776         else
 777                 dev->quota = dev->weight;
 778         __cpu_raise_softirq(cpu, NET_RX_SOFTIRQ);
 779         local_irq_restore(flags);
 780 }
 781
 782 /* Try to reschedule poll. Called by irq handler. */
 783
 784 static inline void netif_rx_schedule(struct net_device *dev)
 785 {
 786         if (netif_rx_schedule_prep(dev))
 787                 __netif_rx_schedule(dev);
 788 }
 789
 790 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().
 791  * Do not inline this?
 792  */
 793 static inline int netif_rx_reschedule(struct net_device *dev, int undo)
 794 {
 795         if (netif_rx_schedule_prep(dev)) {
 796                 unsigned long flags;
 797                 int cpu = smp_processor_id();
 798
 799                 dev->quota += undo;
 800
 801                 local_irq_save(flags);
 802                 list_add_tail(&dev->poll_list, &softnet_data[cpu].poll_list);
 803                 __cpu_raise_softirq(cpu, NET_RX_SOFTIRQ);
 804                 local_irq_restore(flags);
 805                 return 1;
 806         }
 807         return 0;
 808 }
 809
 810 /* Remove interface from poll list: it must be in the poll list
 811  * on current cpu. This primitive is called by dev->poll(), when
 812  * it completes the work. The device cannot be out of poll list at this
 813  * moment, it is BUG().
 814  */
 815 static inline void netif_rx_complete(struct net_device *dev)
 816 {
 817         unsigned long flags;
 818
 819         local_irq_save(flags);
 820         if (!test_bit(__LINK_STATE_RX_SCHED, &dev->state)) BUG();
 821         list_del(&dev->poll_list);
 822         smp_mb__before_clear_bit();
 823         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 824         local_irq_restore(flags);
 825 }
 826
 827 static inline void netif_poll_disable(struct net_device *dev)
 828 {
 829         while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
 830                 /* No hurry. */
 831                 current->state = TASK_INTERRUPTIBLE;
 832                 schedule_timeout(1);
 833         }
 834 }
 835
 836 static inline void netif_poll_enable(struct net_device *dev)
 837 {
 838         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 839 }
 840
 841 /* same as netif_rx_complete, except that local_irq_save(flags)
 842  * has already been issued
 843  */
 844 static inline void __netif_rx_complete(struct net_device *dev)
 845 {
 846         if (!test_bit(__LINK_STATE_RX_SCHED, &dev->state)) BUG();
 847         list_del(&dev->poll_list);
 848         smp_mb__before_clear_bit();
 849         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 850 }
 851
 852 static inline void netif_tx_disable(struct net_device *dev)
 853 {
 854         spin_lock_bh(&dev->xmit_lock);
 855         netif_stop_queue(dev);
 856         spin_unlock_bh(&dev->xmit_lock);
 857 }
 858
 859 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
 860
 861 extern void             ether_setup(struct net_device *dev);
 862 extern void             fddi_setup(struct net_device *dev);
 863 extern void             tr_setup(struct net_device *dev);
 864 extern void             fc_setup(struct net_device *dev);
 865 extern void             fc_freedev(struct net_device *dev);
 866 /* Support for loadable net-drivers */
 867 extern struct net_device *alloc_netdev(int sizeof_priv, const char *name,
 868                                        void (*setup)(struct net_device *));
 869 extern int              register_netdev(struct net_device *dev);
 870 extern void             unregister_netdev(struct net_device *dev);
 871 /* Functions used for multicast support */
 872 extern void             dev_mc_upload(struct net_device *dev);
 873 extern int              dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
 874 extern int              dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
 875 extern void             dev_mc_discard(struct net_device *dev);
 876 extern void             dev_set_promiscuity(struct net_device *dev, int inc);
 877 extern void             dev_set_allmulti(struct net_device *dev, int inc);
 878 extern void             netdev_state_change(struct net_device *dev);
 879 /* Load a device via the kmod */
 880 extern void             dev_load(const char *name);
 881 extern void             dev_mcast_init(void);
 882 extern int              netdev_register_fc(struct net_device *dev, void (*stimul)(struct net_device *dev));
 883 extern void             netdev_unregister_fc(int bit);
 884 extern int              netdev_max_backlog;
 885 extern int              weight_p;
 886 extern unsigned long    netdev_fc_xoff;
 887 extern atomic_t netdev_dropping;
 888 extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
 889 extern struct sk_buff * skb_checksum_help(struct sk_buff *skb);
 890 #ifdef CONFIG_NET_FASTROUTE
 891 extern int              netdev_fastroute;
 892 extern int              netdev_fastroute_obstacles;
 893 extern void             dev_clear_fastroute(struct net_device *dev);
 894 #endif
 895
 896 static inline void free_netdev(struct net_device *dev)
 897 {
 898         kfree(dev);
 899 }
 900
 901 #endif /* __KERNEL__ */
 902
 903 #endif  /* _LINUX_DEV_H */