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 extern int __init netdev_boot_setup(char *str);
 248
 249 /*
 250  *      The DEVICE structure.
 251  *      Actually, this whole structure is a big mistake.  It mixes I/O
 252  *      data with strictly "high-level" data, and it has to know about
 253  *      almost every data structure used in the INET module.
 254  *
 255  *      FIXME: cleanup struct net_device such that network protocol info
 256  *      moves out.
 257  */
 258
 259 struct net_device
 260 {
 261
 262         /*
 263          * This is the first field of the "visible" part of this structure
 264          * (i.e. as seen by users in the "Space.c" file).  It is the name
 265          * the interface.
 266          */
 267         char                    name[IFNAMSIZ];
 268         /* device name hash chain */
 269         struct hlist_node       name_hlist;
 270
 271         /*
 272          *      I/O specific fields
 273          *      FIXME: Merge these and struct ifmap into one
 274          */
 275         unsigned long           mem_end;        /* shared mem end       */
 276         unsigned long           mem_start;      /* shared mem start     */
 277         unsigned long           base_addr;      /* device I/O address   */
 278         unsigned int            irq;            /* device IRQ number    */
 279
 280         /*
 281          *      Some hardware also needs these fields, but they are not
 282          *      part of the usual set specified in Space.c.
 283          */
 284
 285         unsigned char           if_port;        /* Selectable AUI, TP,..*/
 286         unsigned char           dma;            /* DMA channel          */
 287
 288         unsigned long           state;
 289
 290         struct net_device       *next;
 291
 292         /* The device initialization function. Called only once. */
 293         int                     (*init)(struct net_device *dev);
 294
 295         /* ------- Fields preinitialized in Space.c finish here ------- */
 296
 297         /* Net device features */
 298         unsigned long           features;
 299 #define NETIF_F_SG              1       /* Scatter/gather IO. */
 300 #define NETIF_F_IP_CSUM         2       /* Can checksum only TCP/UDP over IPv4. */
 301 #define NETIF_F_NO_CSUM         4       /* Does not require checksum. F.e. loopack. */
 302 #define NETIF_F_HW_CSUM         8       /* Can checksum all the packets. */
 303 #define NETIF_F_HIGHDMA         32      /* Can DMA to high memory. */
 304 #define NETIF_F_FRAGLIST        64      /* Scatter/gather IO. */
 305 #define NETIF_F_HW_VLAN_TX      128     /* Transmit VLAN hw acceleration */
 306 #define NETIF_F_HW_VLAN_RX      256     /* Receive VLAN hw acceleration */
 307 #define NETIF_F_HW_VLAN_FILTER  512     /* Receive filtering on VLAN */
 308 #define NETIF_F_VLAN_CHALLENGED 1024    /* Device cannot handle VLAN packets */
 309 #define NETIF_F_TSO             2048    /* Can offload TCP/IP segmentation */
 310 #define NETIF_F_LLTX            4096    /* LockLess TX */
 311
 312         struct net_device       *next_sched;
 313
 314         /* Interface index. Unique device identifier    */
 315         int                     ifindex;
 316         int                     iflink;
 317
 318
 319         struct net_device_stats* (*get_stats)(struct net_device *dev);
 320         struct iw_statistics*   (*get_wireless_stats)(struct net_device *dev);
 321
 322         /* List of functions to handle Wireless Extensions (instead of ioctl).
 323          * See <net/iw_handler.h> for details. Jean II */
 324         const struct iw_handler_def *   wireless_handlers;
 325         /* Instance data managed by the core of Wireless Extensions. */
 326         struct iw_public_data * wireless_data;
 327
 328         struct ethtool_ops *ethtool_ops;
 329
 330         /*
 331          * This marks the end of the "visible" part of the structure. All
 332          * fields hereafter are internal to the system, and may change at
 333          * will (read: may be cleaned up at will).
 334          */
 335
 336
 337         unsigned short          flags;  /* interface flags (a la BSD)   */
 338         unsigned short          gflags;
 339         unsigned short          priv_flags; /* Like 'flags' but invisible to userspace. */
 340         unsigned short          padded; /* How much padding added by alloc_netdev() */
 341
 342         unsigned                mtu;    /* interface MTU value          */
 343         unsigned short          type;   /* interface hardware type      */
 344         unsigned short          hard_header_len;        /* hardware hdr length  */
 345
 346         struct net_device       *master; /* Pointer to master device of a group,
 347                                           * which this device is member of.
 348                                           */
 349
 350         /* Interface address info. */
 351         unsigned char           perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
 352         unsigned char           addr_len;       /* hardware address length      */
 353         unsigned short          dev_id;         /* for shared network cards */
 354
 355         struct dev_mc_list      *mc_list;       /* Multicast mac addresses      */
 356         int                     mc_count;       /* Number of installed mcasts   */
 357         int                     promiscuity;
 358         int                     allmulti;
 359
 360
 361         /* Protocol specific pointers */
 362
 363         void                    *atalk_ptr;     /* AppleTalk link       */
 364         void                    *ip_ptr;        /* IPv4 specific data   */
 365         void                    *dn_ptr;        /* DECnet specific data */
 366         void                    *ip6_ptr;       /* IPv6 specific data */
 367         void                    *ec_ptr;        /* Econet specific data */
 368         void                    *ax25_ptr;      /* AX.25 specific data */
 369
 370 /*
 371  * Cache line mostly used on receive path (including eth_type_trans())
 372  */
 373         struct list_head        poll_list ____cacheline_aligned_in_smp;
 374                                         /* Link to poll list    */
 375
 376         int                     (*poll) (struct net_device *dev, int *quota);
 377         int                     quota;
 378         int                     weight;
 379         unsigned long           last_rx;        /* Time of last Rx      */
 380         /* Interface address info used in eth_type_trans() */
 381         unsigned char           dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast
 382                                                         because most packets are unicast) */
 383
 384         unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
 385
 386 /*
 387  * Cache line mostly used on queue transmit path (qdisc)
 388  */
 389         /* device queue lock */
 390         spinlock_t              queue_lock ____cacheline_aligned_in_smp;
 391         struct Qdisc            *qdisc;
 392         struct Qdisc            *qdisc_sleeping;
 393         struct list_head        qdisc_list;
 394         unsigned long           tx_queue_len;   /* Max frames per queue allowed */
 395
 396         /* ingress path synchronizer */
 397         spinlock_t              ingress_lock;
 398         struct Qdisc            *qdisc_ingress;
 399
 400 /*
 401  * One part is mostly used on xmit path (device)
 402  */
 403         /* hard_start_xmit synchronizer */
 404         spinlock_t              xmit_lock ____cacheline_aligned_in_smp;
 405         /* cpu id of processor entered to hard_start_xmit or -1,
 406            if nobody entered there.
 407          */
 408         int                     xmit_lock_owner;
 409         void                    *priv;  /* pointer to private data      */
 410         int                     (*hard_start_xmit) (struct sk_buff *skb,
 411                                                     struct net_device *dev);
 412         /* These may be needed for future network-power-down code. */
 413         unsigned long           trans_start;    /* Time (in jiffies) of last Tx */
 414
 415         int                     watchdog_timeo; /* used by dev_watchdog() */
 416         struct timer_list       watchdog_timer;
 417
 418 /*
 419  * refcnt is a very hot point, so align it on SMP
 420  */
 421         /* Number of references to this device */
 422         atomic_t                refcnt ____cacheline_aligned_in_smp;
 423
 424         /* delayed register/unregister */
 425         struct list_head        todo_list;
 426         /* device index hash chain */
 427         struct hlist_node       index_hlist;
 428
 429         /* register/unregister state machine */
 430         enum { NETREG_UNINITIALIZED=0,
 431                NETREG_REGISTERING,      /* called register_netdevice */
 432                NETREG_REGISTERED,       /* completed register todo */
 433                NETREG_UNREGISTERING,    /* called unregister_netdevice */
 434                NETREG_UNREGISTERED,     /* completed unregister todo */
 435                NETREG_RELEASED,         /* called free_netdev */
 436         } reg_state;
 437
 438         /* Called after device is detached from network. */
 439         void                    (*uninit)(struct net_device *dev);
 440         /* Called after last user reference disappears. */
 441         void                    (*destructor)(struct net_device *dev);
 442
 443         /* Pointers to interface service routines.      */
 444         int                     (*open)(struct net_device *dev);
 445         int                     (*stop)(struct net_device *dev);
 446 #define HAVE_NETDEV_POLL
 447         int                     (*hard_header) (struct sk_buff *skb,
 448                                                 struct net_device *dev,
 449                                                 unsigned short type,
 450                                                 void *daddr,
 451                                                 void *saddr,
 452                                                 unsigned len);
 453         int                     (*rebuild_header)(struct sk_buff *skb);
 454 #define HAVE_MULTICAST
 455         void                    (*set_multicast_list)(struct net_device *dev);
 456 #define HAVE_SET_MAC_ADDR
 457         int                     (*set_mac_address)(struct net_device *dev,
 458                                                    void *addr);
 459 #define HAVE_PRIVATE_IOCTL
 460         int                     (*do_ioctl)(struct net_device *dev,
 461                                             struct ifreq *ifr, int cmd);
 462 #define HAVE_SET_CONFIG
 463         int                     (*set_config)(struct net_device *dev,
 464                                               struct ifmap *map);
 465 #define HAVE_HEADER_CACHE
 466         int                     (*hard_header_cache)(struct neighbour *neigh,
 467                                                      struct hh_cache *hh);
 468         void                    (*header_cache_update)(struct hh_cache *hh,
 469                                                        struct net_device *dev,
 470                                                        unsigned char *  haddr);
 471 #define HAVE_CHANGE_MTU
 472         int                     (*change_mtu)(struct net_device *dev, int new_mtu);
 473
 474 #define HAVE_TX_TIMEOUT
 475         void                    (*tx_timeout) (struct net_device *dev);
 476
 477         void                    (*vlan_rx_register)(struct net_device *dev,
 478                                                     struct vlan_group *grp);
 479         void                    (*vlan_rx_add_vid)(struct net_device *dev,
 480                                                    unsigned short vid);
 481         void                    (*vlan_rx_kill_vid)(struct net_device *dev,
 482                                                     unsigned short vid);
 483
 484         int                     (*hard_header_parse)(struct sk_buff *skb,
 485                                                      unsigned char *haddr);
 486         int                     (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
 487 #ifdef CONFIG_NETPOLL
 488         struct netpoll_info     *npinfo;
 489 #endif
 490 #ifdef CONFIG_NET_POLL_CONTROLLER
 491         void                    (*poll_controller)(struct net_device *dev);
 492 #endif
 493
 494         /* bridge stuff */
 495         struct net_bridge_port  *br_port;
 496
 497 #ifdef CONFIG_NET_DIVERT
 498         /* this will get initialized at each interface type init routine */
 499         struct divert_blk       *divert;
 500 #endif /* CONFIG_NET_DIVERT */
 501
 502         /* class/net/name entry */
 503         struct class_device     class_dev;
 504 };
 505
 506 #define NETDEV_ALIGN            32
 507 #define NETDEV_ALIGN_CONST      (NETDEV_ALIGN - 1)
 508
 509 static inline void *netdev_priv(struct net_device *dev)
 510 {
 511         return (char *)dev + ((sizeof(struct net_device)
 512                                         + NETDEV_ALIGN_CONST)
 513                                 & ~NETDEV_ALIGN_CONST);
 514 }
 515
 516 #define SET_MODULE_OWNER(dev) do { } while (0)
 517 /* Set the sysfs physical device reference for the network logical device
 518  * if set prior to registration will cause a symlink during initialization.
 519  */
 520 #define SET_NETDEV_DEV(net, pdev)       ((net)->class_dev.dev = (pdev))
 521
 522 struct packet_type {
 523         __be16                  type;   /* This is really htons(ether_type). */
 524         struct net_device       *dev;   /* NULL is wildcarded here           */
 525         int                     (*func) (struct sk_buff *,
 526                                          struct net_device *,
 527                                          struct packet_type *,
 528                                          struct net_device *);
 529         void                    *af_packet_priv;
 530         struct list_head        list;
 531 };
 532
 533 #include <linux/interrupt.h>
 534 #include <linux/notifier.h>
 535
 536 extern struct net_device                loopback_dev;           /* The loopback */
 537 extern struct net_device                *dev_base;              /* All devices */
 538 extern rwlock_t                         dev_base_lock;          /* Device list lock */
 539
 540 extern int                      netdev_boot_setup_check(struct net_device *dev);
 541 extern unsigned long            netdev_boot_base(const char *prefix, int unit);
 542 extern struct net_device    *dev_getbyhwaddr(unsigned short type, char *hwaddr);
 543 extern struct net_device *dev_getfirstbyhwtype(unsigned short type);
 544 extern void             dev_add_pack(struct packet_type *pt);
 545 extern void             dev_remove_pack(struct packet_type *pt);
 546 extern void             __dev_remove_pack(struct packet_type *pt);
 547
 548 extern struct net_device        *dev_get_by_flags(unsigned short flags,
 549                                                   unsigned short mask);
 550 extern struct net_device        *dev_get_by_name(const char *name);
 551 extern struct net_device        *__dev_get_by_name(const char *name);
 552 extern int              dev_alloc_name(struct net_device *dev, const char *name);
 553 extern int              dev_open(struct net_device *dev);
 554 extern int              dev_close(struct net_device *dev);
 555 extern int              dev_queue_xmit(struct sk_buff *skb);
 556 extern int              register_netdevice(struct net_device *dev);
 557 extern int              unregister_netdevice(struct net_device *dev);
 558 extern void             free_netdev(struct net_device *dev);
 559 extern void             synchronize_net(void);
 560 extern int              register_netdevice_notifier(struct notifier_block *nb);
 561 extern int              unregister_netdevice_notifier(struct notifier_block *nb);
 562 extern int              call_netdevice_notifiers(unsigned long val, void *v);
 563 extern struct net_device        *dev_get_by_index(int ifindex);
 564 extern struct net_device        *__dev_get_by_index(int ifindex);
 565 extern int              dev_restart(struct net_device *dev);
 566 #ifdef CONFIG_NETPOLL_TRAP
 567 extern int              netpoll_trap(void);
 568 #endif
 569
 570 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
 571 extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
 572 static inline int unregister_gifconf(unsigned int family)
 573 {
 574         return register_gifconf(family, NULL);
 575 }
 576
 577 /*
 578  * Incoming packets are placed on per-cpu queues so that
 579  * no locking is needed.
 580  */
 581
 582 struct softnet_data
 583 {
 584         struct net_device       *output_queue;
 585         struct sk_buff_head     input_pkt_queue;
 586         struct list_head        poll_list;
 587         struct sk_buff          *completion_queue;
 588
 589         struct net_device       backlog_dev;    /* Sorry. 8) */
 590 };
 591
 592 DECLARE_PER_CPU(struct softnet_data,softnet_data);
 593
 594 #define HAVE_NETIF_QUEUE
 595
 596 static inline void __netif_schedule(struct net_device *dev)
 597 {
 598         if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
 599                 unsigned long flags;
 600                 struct softnet_data *sd;
 601
 602                 local_irq_save(flags);
 603                 sd = &__get_cpu_var(softnet_data);
 604                 dev->next_sched = sd->output_queue;
 605                 sd->output_queue = dev;
 606                 raise_softirq_irqoff(NET_TX_SOFTIRQ);
 607                 local_irq_restore(flags);
 608         }
 609 }
 610
 611 static inline void netif_schedule(struct net_device *dev)
 612 {
 613         if (!test_bit(__LINK_STATE_XOFF, &dev->state))
 614                 __netif_schedule(dev);
 615 }
 616
 617 static inline void netif_start_queue(struct net_device *dev)
 618 {
 619         clear_bit(__LINK_STATE_XOFF, &dev->state);
 620 }
 621
 622 static inline void netif_wake_queue(struct net_device *dev)
 623 {
 624 #ifdef CONFIG_NETPOLL_TRAP
 625         if (netpoll_trap())
 626                 return;
 627 #endif
 628         if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
 629                 __netif_schedule(dev);
 630 }
 631
 632 static inline void netif_stop_queue(struct net_device *dev)
 633 {
 634 #ifdef CONFIG_NETPOLL_TRAP
 635         if (netpoll_trap())
 636                 return;
 637 #endif
 638         set_bit(__LINK_STATE_XOFF, &dev->state);
 639 }
 640
 641 static inline int netif_queue_stopped(const struct net_device *dev)
 642 {
 643         return test_bit(__LINK_STATE_XOFF, &dev->state);
 644 }
 645
 646 static inline int netif_running(const struct net_device *dev)
 647 {
 648         return test_bit(__LINK_STATE_START, &dev->state);
 649 }
 650
 651
 652 /* Use this variant when it is known for sure that it
 653  * is executing from interrupt context.
 654  */
 655 static inline void dev_kfree_skb_irq(struct sk_buff *skb)
 656 {
 657         if (atomic_dec_and_test(&skb->users)) {
 658                 struct softnet_data *sd;
 659                 unsigned long flags;
 660
 661                 local_irq_save(flags);
 662                 sd = &__get_cpu_var(softnet_data);
 663                 skb->next = sd->completion_queue;
 664                 sd->completion_queue = skb;
 665                 raise_softirq_irqoff(NET_TX_SOFTIRQ);
 666                 local_irq_restore(flags);
 667         }
 668 }
 669
 670 /* Use this variant in places where it could be invoked
 671  * either from interrupt or non-interrupt context.
 672  */
 673 static inline void dev_kfree_skb_any(struct sk_buff *skb)
 674 {
 675         if (in_irq() || irqs_disabled())
 676                 dev_kfree_skb_irq(skb);
 677         else
 678                 dev_kfree_skb(skb);
 679 }
 680
 681 #define HAVE_NETIF_RX 1
 682 extern int              netif_rx(struct sk_buff *skb);
 683 extern int              netif_rx_ni(struct sk_buff *skb);
 684 #define HAVE_NETIF_RECEIVE_SKB 1
 685 extern int              netif_receive_skb(struct sk_buff *skb);
 686 extern int              dev_ioctl(unsigned int cmd, void __user *);
 687 extern int              dev_ethtool(struct ifreq *);
 688 extern unsigned         dev_get_flags(const struct net_device *);
 689 extern int              dev_change_flags(struct net_device *, unsigned);
 690 extern int              dev_change_name(struct net_device *, char *);
 691 extern int              dev_set_mtu(struct net_device *, int);
 692 extern int              dev_set_mac_address(struct net_device *,
 693                                             struct sockaddr *);
 694 extern void             dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev);
 695
 696 extern void             dev_init(void);
 697
 698 extern int              netdev_nit;
 699 extern int              netdev_budget;
 700
 701 /* Called by rtnetlink.c:rtnl_unlock() */
 702 extern void netdev_run_todo(void);
 703
 704 static inline void dev_put(struct net_device *dev)
 705 {
 706         atomic_dec(&dev->refcnt);
 707 }
 708
 709 #define __dev_put(dev) atomic_dec(&(dev)->refcnt)
 710 #define dev_hold(dev) atomic_inc(&(dev)->refcnt)
 711
 712 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
 713  * and _off may be called from IRQ context, but it is caller
 714  * who is responsible for serialization of these calls.
 715  */
 716
 717 extern void linkwatch_fire_event(struct net_device *dev);
 718
 719 static inline int netif_carrier_ok(const struct net_device *dev)
 720 {
 721         return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
 722 }
 723
 724 extern void __netdev_watchdog_up(struct net_device *dev);
 725
 726 extern void netif_carrier_on(struct net_device *dev);
 727
 728 extern void netif_carrier_off(struct net_device *dev);
 729
 730 /* Hot-plugging. */
 731 static inline int netif_device_present(struct net_device *dev)
 732 {
 733         return test_bit(__LINK_STATE_PRESENT, &dev->state);
 734 }
 735
 736 static inline void netif_device_detach(struct net_device *dev)
 737 {
 738         if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
 739             netif_running(dev)) {
 740                 netif_stop_queue(dev);
 741         }
 742 }
 743
 744 static inline void netif_device_attach(struct net_device *dev)
 745 {
 746         if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
 747             netif_running(dev)) {
 748                 netif_wake_queue(dev);
 749                 __netdev_watchdog_up(dev);
 750         }
 751 }
 752
 753 /*
 754  * Network interface message level settings
 755  */
 756 #define HAVE_NETIF_MSG 1
 757
 758 enum {
 759         NETIF_MSG_DRV           = 0x0001,
 760         NETIF_MSG_PROBE         = 0x0002,
 761         NETIF_MSG_LINK          = 0x0004,
 762         NETIF_MSG_TIMER         = 0x0008,
 763         NETIF_MSG_IFDOWN        = 0x0010,
 764         NETIF_MSG_IFUP          = 0x0020,
 765         NETIF_MSG_RX_ERR        = 0x0040,
 766         NETIF_MSG_TX_ERR        = 0x0080,
 767         NETIF_MSG_TX_QUEUED     = 0x0100,
 768         NETIF_MSG_INTR          = 0x0200,
 769         NETIF_MSG_TX_DONE       = 0x0400,
 770         NETIF_MSG_RX_STATUS     = 0x0800,
 771         NETIF_MSG_PKTDATA       = 0x1000,
 772         NETIF_MSG_HW            = 0x2000,
 773         NETIF_MSG_WOL           = 0x4000,
 774 };
 775
 776 #define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
 777 #define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
 778 #define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
 779 #define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
 780 #define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
 781 #define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
 782 #define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
 783 #define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
 784 #define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
 785 #define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
 786 #define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
 787 #define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
 788 #define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
 789 #define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
 790 #define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
 791
 792 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
 793 {
 794         /* use default */
 795         if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
 796                 return default_msg_enable_bits;
 797         if (debug_value == 0)   /* no output */
 798                 return 0;
 799         /* set low N bits */
 800         return (1 << debug_value) - 1;
 801 }
 802
 803 /* Schedule rx intr now? */
 804
 805 static inline int netif_rx_schedule_prep(struct net_device *dev)
 806 {
 807         return netif_running(dev) &&
 808                 !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state);
 809 }
 810
 811 /* Add interface to tail of rx poll list. This assumes that _prep has
 812  * already been called and returned 1.
 813  */
 814
 815 static inline void __netif_rx_schedule(struct net_device *dev)
 816 {
 817         unsigned long flags;
 818
 819         local_irq_save(flags);
 820         dev_hold(dev);
 821         list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
 822         if (dev->quota < 0)
 823                 dev->quota += dev->weight;
 824         else
 825                 dev->quota = dev->weight;
 826         __raise_softirq_irqoff(NET_RX_SOFTIRQ);
 827         local_irq_restore(flags);
 828 }
 829
 830 /* Try to reschedule poll. Called by irq handler. */
 831
 832 static inline void netif_rx_schedule(struct net_device *dev)
 833 {
 834         if (netif_rx_schedule_prep(dev))
 835                 __netif_rx_schedule(dev);
 836 }
 837
 838 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().
 839  * Do not inline this?
 840  */
 841 static inline int netif_rx_reschedule(struct net_device *dev, int undo)
 842 {
 843         if (netif_rx_schedule_prep(dev)) {
 844                 unsigned long flags;
 845
 846                 dev->quota += undo;
 847
 848                 local_irq_save(flags);
 849                 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
 850                 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
 851                 local_irq_restore(flags);
 852                 return 1;
 853         }
 854         return 0;
 855 }
 856
 857 /* Remove interface from poll list: it must be in the poll list
 858  * on current cpu. This primitive is called by dev->poll(), when
 859  * it completes the work. The device cannot be out of poll list at this
 860  * moment, it is BUG().
 861  */
 862 static inline void netif_rx_complete(struct net_device *dev)
 863 {
 864         unsigned long flags;
 865
 866         local_irq_save(flags);
 867         BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
 868         list_del(&dev->poll_list);
 869         smp_mb__before_clear_bit();
 870         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 871         local_irq_restore(flags);
 872 }
 873
 874 static inline void netif_poll_disable(struct net_device *dev)
 875 {
 876         while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
 877                 /* No hurry. */
 878                 current->state = TASK_INTERRUPTIBLE;
 879                 schedule_timeout(1);
 880         }
 881 }
 882
 883 static inline void netif_poll_enable(struct net_device *dev)
 884 {
 885         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 886 }
 887
 888 /* same as netif_rx_complete, except that local_irq_save(flags)
 889  * has already been issued
 890  */
 891 static inline void __netif_rx_complete(struct net_device *dev)
 892 {
 893         BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
 894         list_del(&dev->poll_list);
 895         smp_mb__before_clear_bit();
 896         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 897 }
 898
 899 static inline void netif_tx_disable(struct net_device *dev)
 900 {
 901         spin_lock_bh(&dev->xmit_lock);
 902         netif_stop_queue(dev);
 903         spin_unlock_bh(&dev->xmit_lock);
 904 }
 905
 906 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
 907
 908 extern void             ether_setup(struct net_device *dev);
 909
 910 /* Support for loadable net-drivers */
 911 extern struct net_device *alloc_netdev(int sizeof_priv, const char *name,
 912                                        void (*setup)(struct net_device *));
 913 extern int              register_netdev(struct net_device *dev);
 914 extern void             unregister_netdev(struct net_device *dev);
 915 /* Functions used for multicast support */
 916 extern void             dev_mc_upload(struct net_device *dev);
 917 extern int              dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
 918 extern int              dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
 919 extern void             dev_mc_discard(struct net_device *dev);
 920 extern void             dev_set_promiscuity(struct net_device *dev, int inc);
 921 extern void             dev_set_allmulti(struct net_device *dev, int inc);
 922 extern void             netdev_state_change(struct net_device *dev);
 923 extern void             netdev_features_change(struct net_device *dev);
 924 /* Load a device via the kmod */
 925 extern void             dev_load(const char *name);
 926 extern void             dev_mcast_init(void);
 927 extern int              netdev_max_backlog;
 928 extern int              weight_p;
 929 extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
 930 extern int skb_checksum_help(struct sk_buff *skb, int inward);
 931 /* rx skb timestamps */
 932 extern void             net_enable_timestamp(void);
 933 extern void             net_disable_timestamp(void);
 934
 935 #ifdef CONFIG_PROC_FS
 936 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
 937 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
 938 extern void dev_seq_stop(struct seq_file *seq, void *v);
 939 #endif
 940
 941 extern void linkwatch_run_queue(void);
 942
 943 #endif /* __KERNEL__ */
 944
 945 #endif  /* _LINUX_DEV_H */