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 <asm/atomic.h>
  34 #include <asm/cache.h>
  35 #include <asm/byteorder.h>
  36
  37 #include <linux/config.h>
  38 #include <linux/device.h>
  39 #include <linux/percpu.h>
  40
  41 struct divert_blk;
  42 struct vlan_group;
  43 struct ethtool_ops;
  44 struct netpoll_info;
  45                                         /* source back-compat hooks */
  46 #define SET_ETHTOOL_OPS(netdev,ops) \
  47         ( (netdev)->ethtool_ops = (ops) )
  48
  49 #define HAVE_ALLOC_NETDEV               /* feature macro: alloc_xxxdev
  50                                            functions are available. */
  51 #define HAVE_FREE_NETDEV                /* free_netdev() */
  52 #define HAVE_NETDEV_PRIV                /* netdev_priv() */
  53
  54 #define NET_XMIT_SUCCESS        0
  55 #define NET_XMIT_DROP           1       /* skb dropped                  */
  56 #define NET_XMIT_CN             2       /* congestion notification      */
  57 #define NET_XMIT_POLICED        3       /* skb is shot by police        */
  58 #define NET_XMIT_BYPASS         4       /* packet does not leave via dequeue;
  59                                            (TC use only - dev_queue_xmit
  60                                            returns this as NET_XMIT_SUCCESS) */
  61
  62 /* Backlog congestion levels */
  63 #define NET_RX_SUCCESS          0   /* keep 'em coming, baby */
  64 #define NET_RX_DROP             1  /* packet dropped */
  65 #define NET_RX_CN_LOW           2   /* storm alert, just in case */
  66 #define NET_RX_CN_MOD           3   /* Storm on its way! */
  67 #define NET_RX_CN_HIGH          4   /* The storm is here */
  68 #define NET_RX_BAD              5  /* packet dropped due to kernel error */
  69
  70 #define net_xmit_errno(e)       ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
  71
  72 #endif
  73
  74 #define MAX_ADDR_LEN    32              /* Largest hardware address length */
  75
  76 /* Driver transmit return codes */
  77 #define NETDEV_TX_OK 0          /* driver took care of packet */
  78 #define NETDEV_TX_BUSY 1        /* driver tx path was busy*/
  79 #define NETDEV_TX_LOCKED -1     /* driver tx lock was already taken */
  80
  81 /*
  82  *      Compute the worst case header length according to the protocols
  83  *      used.
  84  */
  85
  86 #if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR)
  87 #define LL_MAX_HEADER   32
  88 #else
  89 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
  90 #define LL_MAX_HEADER   96
  91 #else
  92 #define LL_MAX_HEADER   48
  93 #endif
  94 #endif
  95
  96 #if !defined(CONFIG_NET_IPIP) && \
  97     !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE)
  98 #define MAX_HEADER LL_MAX_HEADER
  99 #else
 100 #define MAX_HEADER (LL_MAX_HEADER + 48)
 101 #endif
 102
 103 /*
 104  *      Network device statistics. Akin to the 2.0 ether stats but
 105  *      with byte counters.
 106  */
 107
 108 struct net_device_stats
 109 {
 110         unsigned long   rx_packets;             /* total packets received       */
 111         unsigned long   tx_packets;             /* total packets transmitted    */
 112         unsigned long   rx_bytes;               /* total bytes received         */
 113         unsigned long   tx_bytes;               /* total bytes transmitted      */
 114         unsigned long   rx_errors;              /* bad packets received         */
 115         unsigned long   tx_errors;              /* packet transmit problems     */
 116         unsigned long   rx_dropped;             /* no space in linux buffers    */
 117         unsigned long   tx_dropped;             /* no space available in linux  */
 118         unsigned long   multicast;              /* multicast packets received   */
 119         unsigned long   collisions;
 120
 121         /* detailed rx_errors: */
 122         unsigned long   rx_length_errors;
 123         unsigned long   rx_over_errors;         /* receiver ring buff overflow  */
 124         unsigned long   rx_crc_errors;          /* recved pkt with crc error    */
 125         unsigned long   rx_frame_errors;        /* recv'd frame alignment error */
 126         unsigned long   rx_fifo_errors;         /* recv'r fifo overrun          */
 127         unsigned long   rx_missed_errors;       /* receiver missed packet       */
 128
 129         /* detailed tx_errors */
 130         unsigned long   tx_aborted_errors;
 131         unsigned long   tx_carrier_errors;
 132         unsigned long   tx_fifo_errors;
 133         unsigned long   tx_heartbeat_errors;
 134         unsigned long   tx_window_errors;
 135
 136         /* for cslip etc */
 137         unsigned long   rx_compressed;
 138         unsigned long   tx_compressed;
 139 };
 140
 141
 142 /* Media selection options. */
 143 enum {
 144         IF_PORT_UNKNOWN = 0,
 145         IF_PORT_10BASE2,
 146         IF_PORT_10BASET,
 147         IF_PORT_AUI,
 148         IF_PORT_100BASET,
 149         IF_PORT_100BASETX,
 150         IF_PORT_100BASEFX
 151 };
 152
 153 #ifdef __KERNEL__
 154
 155 #include <linux/cache.h>
 156 #include <linux/skbuff.h>
 157
 158 struct neighbour;
 159 struct neigh_parms;
 160 struct sk_buff;
 161
 162 struct netif_rx_stats
 163 {
 164         unsigned total;
 165         unsigned dropped;
 166         unsigned time_squeeze;
 167         unsigned cpu_collision;
 168 };
 169
 170 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
 171
 172
 173 /*
 174  *      We tag multicasts with these structures.
 175  */
 176
 177 struct dev_mc_list
 178 {
 179         struct dev_mc_list      *next;
 180         __u8                    dmi_addr[MAX_ADDR_LEN];
 181         unsigned char           dmi_addrlen;
 182         int                     dmi_users;
 183         int                     dmi_gusers;
 184 };
 185
 186 struct hh_cache
 187 {
 188         struct hh_cache *hh_next;       /* Next entry                        */
 189         atomic_t        hh_refcnt;      /* number of users                   */
 190         unsigned short  hh_type;        /* protocol identifier, f.e ETH_P_IP
 191                                          *  NOTE:  For VLANs, this will be the
 192                                          *  encapuslated type. --BLG
 193                                          */
 194         int             hh_len;         /* length of header */
 195         int             (*hh_output)(struct sk_buff *skb);
 196         rwlock_t        hh_lock;
 197
 198         /* cached hardware header; allow for machine alignment needs.        */
 199 #define HH_DATA_MOD     16
 200 #define HH_DATA_OFF(__len) \
 201         (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
 202 #define HH_DATA_ALIGN(__len) \
 203         (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
 204         unsigned long   hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
 205 };
 206
 207 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
 208  * Alternative is:
 209  *   dev->hard_header_len ? (dev->hard_header_len +
 210  *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
 211  *
 212  * We could use other alignment values, but we must maintain the
 213  * relationship HH alignment <= LL alignment.
 214  */
 215 #define LL_RESERVED_SPACE(dev) \
 216         (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 217 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
 218         ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 219
 220 /* These flag bits are private to the generic network queueing
 221  * layer, they may not be explicitly referenced by any other
 222  * code.
 223  */
 224
 225 enum netdev_state_t
 226 {
 227         __LINK_STATE_XOFF=0,
 228         __LINK_STATE_START,
 229         __LINK_STATE_PRESENT,
 230         __LINK_STATE_SCHED,
 231         __LINK_STATE_NOCARRIER,
 232         __LINK_STATE_RX_SCHED,
 233         __LINK_STATE_LINKWATCH_PENDING
 234 };
 235
 236
 237 /*
 238  * This structure holds at boot time configured netdevice settings. They
 239  * are then used in the device probing.
 240  */
 241 struct netdev_boot_setup {
 242         char name[IFNAMSIZ];
 243         struct ifmap map;
 244 };
 245 #define NETDEV_BOOT_SETUP_MAX 8
 246
 247
 248 /*
 249  *      The DEVICE structure.
 250  *      Actually, this whole structure is a big mistake.  It mixes I/O
 251  *      data with strictly "high-level" data, and it has to know about
 252  *      almost every data structure used in the INET module.
 253  *
 254  *      FIXME: cleanup struct net_device such that network protocol info
 255  *      moves out.
 256  */
 257
 258 struct net_device
 259 {
 260
 261         /*
 262          * This is the first field of the "visible" part of this structure
 263          * (i.e. as seen by users in the "Space.c" file).  It is the name
 264          * the interface.
 265          */
 266         char                    name[IFNAMSIZ];
 267
 268         /*
 269          *      I/O specific fields
 270          *      FIXME: Merge these and struct ifmap into one
 271          */
 272         unsigned long           mem_end;        /* shared mem end       */
 273         unsigned long           mem_start;      /* shared mem start     */
 274         unsigned long           base_addr;      /* device I/O address   */
 275         unsigned int            irq;            /* device IRQ number    */
 276
 277         /*
 278          *      Some hardware also needs these fields, but they are not
 279          *      part of the usual set specified in Space.c.
 280          */
 281
 282         unsigned char           if_port;        /* Selectable AUI, TP,..*/
 283         unsigned char           dma;            /* DMA channel          */
 284
 285         unsigned long           state;
 286
 287         struct net_device       *next;
 288
 289         /* The device initialization function. Called only once. */
 290         int                     (*init)(struct net_device *dev);
 291
 292         /* ------- Fields preinitialized in Space.c finish here ------- */
 293
 294         struct net_device       *next_sched;
 295
 296         /* Interface index. Unique device identifier    */
 297         int                     ifindex;
 298         int                     iflink;
 299
 300
 301         struct net_device_stats* (*get_stats)(struct net_device *dev);
 302         struct iw_statistics*   (*get_wireless_stats)(struct net_device *dev);
 303
 304         /* List of functions to handle Wireless Extensions (instead of ioctl).
 305          * See <net/iw_handler.h> for details. Jean II */
 306         const struct iw_handler_def *   wireless_handlers;
 307         /* Instance data managed by the core of Wireless Extensions. */
 308         struct iw_public_data * wireless_data;
 309
 310         struct ethtool_ops *ethtool_ops;
 311
 312         /*
 313          * This marks the end of the "visible" part of the structure. All
 314          * fields hereafter are internal to the system, and may change at
 315          * will (read: may be cleaned up at will).
 316          */
 317
 318         /* These may be needed for future network-power-down code. */
 319         unsigned long           trans_start;    /* Time (in jiffies) of last Tx */
 320         unsigned long           last_rx;        /* Time of last Rx      */
 321
 322         unsigned short          flags;  /* interface flags (a la BSD)   */
 323         unsigned short          gflags;
 324         unsigned short          priv_flags; /* Like 'flags' but invisible to userspace. */
 325         unsigned short          padded; /* How much padding added by alloc_netdev() */
 326
 327         unsigned                mtu;    /* interface MTU value          */
 328         unsigned short          type;   /* interface hardware type      */
 329         unsigned short          hard_header_len;        /* hardware hdr length  */
 330         void                    *priv;  /* pointer to private data      */
 331
 332         struct net_device       *master; /* Pointer to master device of a group,
 333                                           * which this device is member of.
 334                                           */
 335
 336         /* Interface address info. */
 337         unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
 338         unsigned char           dev_addr[MAX_ADDR_LEN]; /* hw address   */
 339         unsigned char           addr_len;       /* hardware address length      */
 340         unsigned short          dev_id;         /* for shared network cards */
 341
 342         struct dev_mc_list      *mc_list;       /* Multicast mac addresses      */
 343         int                     mc_count;       /* Number of installed mcasts   */
 344         int                     promiscuity;
 345         int                     allmulti;
 346
 347         int                     watchdog_timeo;
 348         struct timer_list       watchdog_timer;
 349
 350         /* Protocol specific pointers */
 351
 352         void                    *atalk_ptr;     /* AppleTalk link       */
 353         void                    *ip_ptr;        /* IPv4 specific data   */
 354         void                    *dn_ptr;        /* DECnet specific data */
 355         void                    *ip6_ptr;       /* IPv6 specific data */
 356         void                    *ec_ptr;        /* Econet specific data */
 357         void                    *ax25_ptr;      /* AX.25 specific data */
 358
 359         struct list_head        poll_list;      /* Link to poll list    */
 360         int                     quota;
 361         int                     weight;
 362
 363         struct Qdisc            *qdisc;
 364         struct Qdisc            *qdisc_sleeping;
 365         struct Qdisc            *qdisc_ingress;
 366         struct list_head        qdisc_list;
 367         unsigned long           tx_queue_len;   /* Max frames per queue allowed */
 368
 369         /* ingress path synchronizer */
 370         spinlock_t              ingress_lock;
 371         /* hard_start_xmit synchronizer */
 372         spinlock_t              xmit_lock;
 373         /* cpu id of processor entered to hard_start_xmit or -1,
 374            if nobody entered there.
 375          */
 376         int                     xmit_lock_owner;
 377         /* device queue lock */
 378         spinlock_t              queue_lock;
 379         /* Number of references to this device */
 380         atomic_t                refcnt;
 381         /* delayed register/unregister */
 382         struct list_head        todo_list;
 383         /* device name hash chain */
 384         struct hlist_node       name_hlist;
 385         /* device index hash chain */
 386         struct hlist_node       index_hlist;
 387
 388         /* register/unregister state machine */
 389         enum { NETREG_UNINITIALIZED=0,
 390                NETREG_REGISTERING,      /* called register_netdevice */
 391                NETREG_REGISTERED,       /* completed register todo */
 392                NETREG_UNREGISTERING,    /* called unregister_netdevice */
 393                NETREG_UNREGISTERED,     /* completed unregister todo */
 394                NETREG_RELEASED,         /* called free_netdev */
 395         } reg_state;
 396
 397         /* Net device features */
 398         unsigned long           features;
 399 #define NETIF_F_SG              1       /* Scatter/gather IO. */
 400 #define NETIF_F_IP_CSUM         2       /* Can checksum only TCP/UDP over IPv4. */
 401 #define NETIF_F_NO_CSUM         4       /* Does not require checksum. F.e. loopack. */
 402 #define NETIF_F_HW_CSUM         8       /* Can checksum all the packets. */
 403 #define NETIF_F_HIGHDMA         32      /* Can DMA to high memory. */
 404 #define NETIF_F_FRAGLIST        64      /* Scatter/gather IO. */
 405 #define NETIF_F_HW_VLAN_TX      128     /* Transmit VLAN hw acceleration */
 406 #define NETIF_F_HW_VLAN_RX      256     /* Receive VLAN hw acceleration */
 407 #define NETIF_F_HW_VLAN_FILTER  512     /* Receive filtering on VLAN */
 408 #define NETIF_F_VLAN_CHALLENGED 1024    /* Device cannot handle VLAN packets */
 409 #define NETIF_F_TSO             2048    /* Can offload TCP/IP segmentation */
 410 #define NETIF_F_LLTX            4096    /* LockLess TX */
 411
 412         /* Called after device is detached from network. */
 413         void                    (*uninit)(struct net_device *dev);
 414         /* Called after last user reference disappears. */
 415         void                    (*destructor)(struct net_device *dev);
 416
 417         /* Pointers to interface service routines.      */
 418         int                     (*open)(struct net_device *dev);
 419         int                     (*stop)(struct net_device *dev);
 420         int                     (*hard_start_xmit) (struct sk_buff *skb,
 421                                                     struct net_device *dev);
 422 #define HAVE_NETDEV_POLL
 423         int                     (*poll) (struct net_device *dev, int *quota);
 424         int                     (*hard_header) (struct sk_buff *skb,
 425                                                 struct net_device *dev,
 426                                                 unsigned short type,
 427                                                 void *daddr,
 428                                                 void *saddr,
 429                                                 unsigned len);
 430         int                     (*rebuild_header)(struct sk_buff *skb);
 431 #define HAVE_MULTICAST
 432         void                    (*set_multicast_list)(struct net_device *dev);
 433 #define HAVE_SET_MAC_ADDR
 434         int                     (*set_mac_address)(struct net_device *dev,
 435                                                    void *addr);
 436 #define HAVE_PRIVATE_IOCTL
 437         int                     (*do_ioctl)(struct net_device *dev,
 438                                             struct ifreq *ifr, int cmd);
 439 #define HAVE_SET_CONFIG
 440         int                     (*set_config)(struct net_device *dev,
 441                                               struct ifmap *map);
 442 #define HAVE_HEADER_CACHE
 443         int                     (*hard_header_cache)(struct neighbour *neigh,
 444                                                      struct hh_cache *hh);
 445         void                    (*header_cache_update)(struct hh_cache *hh,
 446                                                        struct net_device *dev,
 447                                                        unsigned char *  haddr);
 448 #define HAVE_CHANGE_MTU
 449         int                     (*change_mtu)(struct net_device *dev, int new_mtu);
 450
 451 #define HAVE_TX_TIMEOUT
 452         void                    (*tx_timeout) (struct net_device *dev);
 453
 454         void                    (*vlan_rx_register)(struct net_device *dev,
 455                                                     struct vlan_group *grp);
 456         void                    (*vlan_rx_add_vid)(struct net_device *dev,
 457                                                    unsigned short vid);
 458         void                    (*vlan_rx_kill_vid)(struct net_device *dev,
 459                                                     unsigned short vid);
 460
 461         int                     (*hard_header_parse)(struct sk_buff *skb,
 462                                                      unsigned char *haddr);
 463         int                     (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
 464 #ifdef CONFIG_NETPOLL
 465         struct netpoll_info     *npinfo;
 466 #endif
 467 #ifdef CONFIG_NET_POLL_CONTROLLER
 468         void                    (*poll_controller)(struct net_device *dev);
 469 #endif
 470
 471         /* bridge stuff */
 472         struct net_bridge_port  *br_port;
 473
 474 #ifdef CONFIG_NET_DIVERT
 475         /* this will get initialized at each interface type init routine */
 476         struct divert_blk       *divert;
 477 #endif /* CONFIG_NET_DIVERT */
 478
 479         /* class/net/name entry */
 480         struct class_device     class_dev;
 481 };
 482
 483 #define NETDEV_ALIGN            32
 484 #define NETDEV_ALIGN_CONST      (NETDEV_ALIGN - 1)
 485
 486 static inline void *netdev_priv(struct net_device *dev)
 487 {
 488         return (char *)dev + ((sizeof(struct net_device)
 489                                         + NETDEV_ALIGN_CONST)
 490                                 & ~NETDEV_ALIGN_CONST);
 491 }
 492
 493 #define SET_MODULE_OWNER(dev) do { } while (0)
 494 /* Set the sysfs physical device reference for the network logical device
 495  * if set prior to registration will cause a symlink during initialization.
 496  */
 497 #define SET_NETDEV_DEV(net, pdev)       ((net)->class_dev.dev = (pdev))
 498
 499 struct packet_type {
 500         __be16                  type;   /* This is really htons(ether_type).    */
 501         struct net_device               *dev;   /* NULL is wildcarded here              */
 502         int                     (*func) (struct sk_buff *, struct net_device *,
 503                                          struct packet_type *);
 504         void                    *af_packet_priv;
 505         struct list_head        list;
 506 };
 507
 508 #include <linux/interrupt.h>
 509 #include <linux/notifier.h>
 510
 511 extern struct net_device                loopback_dev;           /* The loopback */
 512 extern struct net_device                *dev_base;              /* All devices */
 513 extern rwlock_t                         dev_base_lock;          /* Device list lock */
 514
 515 extern int                      netdev_boot_setup_check(struct net_device *dev);
 516 extern unsigned long            netdev_boot_base(const char *prefix, int unit);
 517 extern struct net_device    *dev_getbyhwaddr(unsigned short type, char *hwaddr);
 518 extern struct net_device *dev_getfirstbyhwtype(unsigned short type);
 519 extern void             dev_add_pack(struct packet_type *pt);
 520 extern void             dev_remove_pack(struct packet_type *pt);
 521 extern void             __dev_remove_pack(struct packet_type *pt);
 522
 523 extern struct net_device        *dev_get_by_flags(unsigned short flags,
 524                                                   unsigned short mask);
 525 extern struct net_device        *dev_get_by_name(const char *name);
 526 extern struct net_device        *__dev_get_by_name(const char *name);
 527 extern int              dev_alloc_name(struct net_device *dev, const char *name);
 528 extern int              dev_open(struct net_device *dev);
 529 extern int              dev_close(struct net_device *dev);
 530 extern int              dev_queue_xmit(struct sk_buff *skb);
 531 extern int              register_netdevice(struct net_device *dev);
 532 extern int              unregister_netdevice(struct net_device *dev);
 533 extern void             free_netdev(struct net_device *dev);
 534 extern void             synchronize_net(void);
 535 extern int              register_netdevice_notifier(struct notifier_block *nb);
 536 extern int              unregister_netdevice_notifier(struct notifier_block *nb);
 537 extern int              call_netdevice_notifiers(unsigned long val, void *v);
 538 extern struct net_device        *dev_get_by_index(int ifindex);
 539 extern struct net_device        *__dev_get_by_index(int ifindex);
 540 extern int              dev_restart(struct net_device *dev);
 541 #ifdef CONFIG_NETPOLL_TRAP
 542 extern int              netpoll_trap(void);
 543 #endif
 544
 545 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
 546 extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
 547 static inline int unregister_gifconf(unsigned int family)
 548 {
 549         return register_gifconf(family, NULL);
 550 }
 551
 552 /*
 553  * Incoming packets are placed on per-cpu queues so that
 554  * no locking is needed.
 555  */
 556
 557 struct softnet_data
 558 {
 559         struct net_device       *output_queue;
 560         struct sk_buff_head     input_pkt_queue;
 561         struct list_head        poll_list;
 562         struct sk_buff          *completion_queue;
 563
 564         struct net_device       backlog_dev;    /* Sorry. 8) */
 565 };
 566
 567 DECLARE_PER_CPU(struct softnet_data,softnet_data);
 568
 569 #define HAVE_NETIF_QUEUE
 570
 571 static inline void __netif_schedule(struct net_device *dev)
 572 {
 573         if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
 574                 unsigned long flags;
 575                 struct softnet_data *sd;
 576
 577                 local_irq_save(flags);
 578                 sd = &__get_cpu_var(softnet_data);
 579                 dev->next_sched = sd->output_queue;
 580                 sd->output_queue = dev;
 581                 raise_softirq_irqoff(NET_TX_SOFTIRQ);
 582                 local_irq_restore(flags);
 583         }
 584 }
 585
 586 static inline void netif_schedule(struct net_device *dev)
 587 {
 588         if (!test_bit(__LINK_STATE_XOFF, &dev->state))
 589                 __netif_schedule(dev);
 590 }
 591
 592 static inline void netif_start_queue(struct net_device *dev)
 593 {
 594         clear_bit(__LINK_STATE_XOFF, &dev->state);
 595 }
 596
 597 static inline void netif_wake_queue(struct net_device *dev)
 598 {
 599 #ifdef CONFIG_NETPOLL_TRAP
 600         if (netpoll_trap())
 601                 return;
 602 #endif
 603         if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
 604                 __netif_schedule(dev);
 605 }
 606
 607 static inline void netif_stop_queue(struct net_device *dev)
 608 {
 609 #ifdef CONFIG_NETPOLL_TRAP
 610         if (netpoll_trap())
 611                 return;
 612 #endif
 613         set_bit(__LINK_STATE_XOFF, &dev->state);
 614 }
 615
 616 static inline int netif_queue_stopped(const struct net_device *dev)
 617 {
 618         return test_bit(__LINK_STATE_XOFF, &dev->state);
 619 }
 620
 621 static inline int netif_running(const struct net_device *dev)
 622 {
 623         return test_bit(__LINK_STATE_START, &dev->state);
 624 }
 625
 626
 627 /* Use this variant when it is known for sure that it
 628  * is executing from interrupt context.
 629  */
 630 static inline void dev_kfree_skb_irq(struct sk_buff *skb)
 631 {
 632         if (atomic_dec_and_test(&skb->users)) {
 633                 struct softnet_data *sd;
 634                 unsigned long flags;
 635
 636                 local_irq_save(flags);
 637                 sd = &__get_cpu_var(softnet_data);
 638                 skb->next = sd->completion_queue;
 639                 sd->completion_queue = skb;
 640                 raise_softirq_irqoff(NET_TX_SOFTIRQ);
 641                 local_irq_restore(flags);
 642         }
 643 }
 644
 645 /* Use this variant in places where it could be invoked
 646  * either from interrupt or non-interrupt context.
 647  */
 648 static inline void dev_kfree_skb_any(struct sk_buff *skb)
 649 {
 650         if (in_irq() || irqs_disabled())
 651                 dev_kfree_skb_irq(skb);
 652         else
 653                 dev_kfree_skb(skb);
 654 }
 655
 656 #define HAVE_NETIF_RX 1
 657 extern int              netif_rx(struct sk_buff *skb);
 658 extern int              netif_rx_ni(struct sk_buff *skb);
 659 #define HAVE_NETIF_RECEIVE_SKB 1
 660 extern int              netif_receive_skb(struct sk_buff *skb);
 661 extern int              dev_ioctl(unsigned int cmd, void __user *);
 662 extern int              dev_ethtool(struct ifreq *);
 663 extern unsigned         dev_get_flags(const struct net_device *);
 664 extern int              dev_change_flags(struct net_device *, unsigned);
 665 extern int              dev_change_name(struct net_device *, char *);
 666 extern int              dev_set_mtu(struct net_device *, int);
 667 extern int              dev_set_mac_address(struct net_device *,
 668                                             struct sockaddr *);
 669 extern void             dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev);
 670
 671 extern void             dev_init(void);
 672
 673 extern int              netdev_nit;
 674
 675 /* Called by rtnetlink.c:rtnl_unlock() */
 676 extern void netdev_run_todo(void);
 677
 678 static inline void dev_put(struct net_device *dev)
 679 {
 680         atomic_dec(&dev->refcnt);
 681 }
 682
 683 #define __dev_put(dev) atomic_dec(&(dev)->refcnt)
 684 #define dev_hold(dev) atomic_inc(&(dev)->refcnt)
 685
 686 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
 687  * and _off may be called from IRQ context, but it is caller
 688  * who is responsible for serialization of these calls.
 689  */
 690
 691 extern void linkwatch_fire_event(struct net_device *dev);
 692
 693 static inline int netif_carrier_ok(const struct net_device *dev)
 694 {
 695         return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
 696 }
 697
 698 extern void __netdev_watchdog_up(struct net_device *dev);
 699
 700 static inline void netif_carrier_on(struct net_device *dev)
 701 {
 702         if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state))
 703                 linkwatch_fire_event(dev);
 704         if (netif_running(dev))
 705                 __netdev_watchdog_up(dev);
 706 }
 707
 708 static inline void netif_carrier_off(struct net_device *dev)
 709 {
 710         if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state))
 711                 linkwatch_fire_event(dev);
 712 }
 713
 714 /* Hot-plugging. */
 715 static inline int netif_device_present(struct net_device *dev)
 716 {
 717         return test_bit(__LINK_STATE_PRESENT, &dev->state);
 718 }
 719
 720 static inline void netif_device_detach(struct net_device *dev)
 721 {
 722         if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
 723             netif_running(dev)) {
 724                 netif_stop_queue(dev);
 725         }
 726 }
 727
 728 static inline void netif_device_attach(struct net_device *dev)
 729 {
 730         if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
 731             netif_running(dev)) {
 732                 netif_wake_queue(dev);
 733                 __netdev_watchdog_up(dev);
 734         }
 735 }
 736
 737 /*
 738  * Network interface message level settings
 739  */
 740 #define HAVE_NETIF_MSG 1
 741
 742 enum {
 743         NETIF_MSG_DRV           = 0x0001,
 744         NETIF_MSG_PROBE         = 0x0002,
 745         NETIF_MSG_LINK          = 0x0004,
 746         NETIF_MSG_TIMER         = 0x0008,
 747         NETIF_MSG_IFDOWN        = 0x0010,
 748         NETIF_MSG_IFUP          = 0x0020,
 749         NETIF_MSG_RX_ERR        = 0x0040,
 750         NETIF_MSG_TX_ERR        = 0x0080,
 751         NETIF_MSG_TX_QUEUED     = 0x0100,
 752         NETIF_MSG_INTR          = 0x0200,
 753         NETIF_MSG_TX_DONE       = 0x0400,
 754         NETIF_MSG_RX_STATUS     = 0x0800,
 755         NETIF_MSG_PKTDATA       = 0x1000,
 756         NETIF_MSG_HW            = 0x2000,
 757         NETIF_MSG_WOL           = 0x4000,
 758 };
 759
 760 #define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
 761 #define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
 762 #define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
 763 #define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
 764 #define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
 765 #define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
 766 #define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
 767 #define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
 768 #define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
 769 #define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
 770 #define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
 771 #define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
 772 #define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
 773 #define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
 774 #define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
 775
 776 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
 777 {
 778         /* use default */
 779         if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
 780                 return default_msg_enable_bits;
 781         if (debug_value == 0)   /* no output */
 782                 return 0;
 783         /* set low N bits */
 784         return (1 << debug_value) - 1;
 785 }
 786
 787 /* Schedule rx intr now? */
 788
 789 static inline int netif_rx_schedule_prep(struct net_device *dev)
 790 {
 791         return netif_running(dev) &&
 792                 !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state);
 793 }
 794
 795 /* Add interface to tail of rx poll list. This assumes that _prep has
 796  * already been called and returned 1.
 797  */
 798
 799 static inline void __netif_rx_schedule(struct net_device *dev)
 800 {
 801         unsigned long flags;
 802
 803         local_irq_save(flags);
 804         dev_hold(dev);
 805         list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
 806         if (dev->quota < 0)
 807                 dev->quota += dev->weight;
 808         else
 809                 dev->quota = dev->weight;
 810         __raise_softirq_irqoff(NET_RX_SOFTIRQ);
 811         local_irq_restore(flags);
 812 }
 813
 814 /* Try to reschedule poll. Called by irq handler. */
 815
 816 static inline void netif_rx_schedule(struct net_device *dev)
 817 {
 818         if (netif_rx_schedule_prep(dev))
 819                 __netif_rx_schedule(dev);
 820 }
 821
 822 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().
 823  * Do not inline this?
 824  */
 825 static inline int netif_rx_reschedule(struct net_device *dev, int undo)
 826 {
 827         if (netif_rx_schedule_prep(dev)) {
 828                 unsigned long flags;
 829
 830                 dev->quota += undo;
 831
 832                 local_irq_save(flags);
 833                 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
 834                 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
 835                 local_irq_restore(flags);
 836                 return 1;
 837         }
 838         return 0;
 839 }
 840
 841 /* Remove interface from poll list: it must be in the poll list
 842  * on current cpu. This primitive is called by dev->poll(), when
 843  * it completes the work. The device cannot be out of poll list at this
 844  * moment, it is BUG().
 845  */
 846 static inline void netif_rx_complete(struct net_device *dev)
 847 {
 848         unsigned long flags;
 849
 850         local_irq_save(flags);
 851         BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
 852         list_del(&dev->poll_list);
 853         smp_mb__before_clear_bit();
 854         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 855         local_irq_restore(flags);
 856 }
 857
 858 static inline void netif_poll_disable(struct net_device *dev)
 859 {
 860         while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
 861                 /* No hurry. */
 862                 current->state = TASK_INTERRUPTIBLE;
 863                 schedule_timeout(1);
 864         }
 865 }
 866
 867 static inline void netif_poll_enable(struct net_device *dev)
 868 {
 869         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 870 }
 871
 872 /* same as netif_rx_complete, except that local_irq_save(flags)
 873  * has already been issued
 874  */
 875 static inline void __netif_rx_complete(struct net_device *dev)
 876 {
 877         BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
 878         list_del(&dev->poll_list);
 879         smp_mb__before_clear_bit();
 880         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 881 }
 882
 883 static inline void netif_tx_disable(struct net_device *dev)
 884 {
 885         spin_lock_bh(&dev->xmit_lock);
 886         netif_stop_queue(dev);
 887         spin_unlock_bh(&dev->xmit_lock);
 888 }
 889
 890 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
 891
 892 extern void             ether_setup(struct net_device *dev);
 893
 894 /* Support for loadable net-drivers */
 895 extern struct net_device *alloc_netdev(int sizeof_priv, const char *name,
 896                                        void (*setup)(struct net_device *));
 897 extern int              register_netdev(struct net_device *dev);
 898 extern void             unregister_netdev(struct net_device *dev);
 899 /* Functions used for multicast support */
 900 extern void             dev_mc_upload(struct net_device *dev);
 901 extern int              dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
 902 extern int              dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
 903 extern void             dev_mc_discard(struct net_device *dev);
 904 extern void             dev_set_promiscuity(struct net_device *dev, int inc);
 905 extern void             dev_set_allmulti(struct net_device *dev, int inc);
 906 extern void             netdev_state_change(struct net_device *dev);
 907 extern void             netdev_features_change(struct net_device *dev);
 908 /* Load a device via the kmod */
 909 extern void             dev_load(const char *name);
 910 extern void             dev_mcast_init(void);
 911 extern int              netdev_max_backlog;
 912 extern int              weight_p;
 913 extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
 914 extern int skb_checksum_help(struct sk_buff *skb, int inward);
 915 /* rx skb timestamps */
 916 extern void             net_enable_timestamp(void);
 917 extern void             net_disable_timestamp(void);
 918
 919 #endif /* __KERNEL__ */
 920
 921 #endif  /* _LINUX_DEV_H */