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;
  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 throttled;
 168         unsigned fastroute_hit;
 169         unsigned fastroute_success;
 170         unsigned fastroute_defer;
 171         unsigned fastroute_deferred_out;
 172         unsigned fastroute_latency_reduction;
 173         unsigned cpu_collision;
 174 };
 175
 176 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
 177
 178
 179 /*
 180  *      We tag multicasts with these structures.
 181  */
 182
 183 struct dev_mc_list
 184 {
 185         struct dev_mc_list      *next;
 186         __u8                    dmi_addr[MAX_ADDR_LEN];
 187         unsigned char           dmi_addrlen;
 188         int                     dmi_users;
 189         int                     dmi_gusers;
 190 };
 191
 192 struct hh_cache
 193 {
 194         struct hh_cache *hh_next;       /* Next entry                        */
 195         atomic_t        hh_refcnt;      /* number of users                   */
 196         unsigned short  hh_type;        /* protocol identifier, f.e ETH_P_IP
 197                                          *  NOTE:  For VLANs, this will be the
 198                                          *  encapuslated type. --BLG
 199                                          */
 200         int             hh_len;         /* length of header */
 201         int             (*hh_output)(struct sk_buff *skb);
 202         rwlock_t        hh_lock;
 203
 204         /* cached hardware header; allow for machine alignment needs.        */
 205 #define HH_DATA_MOD     16
 206 #define HH_DATA_OFF(__len) \
 207         (HH_DATA_MOD - ((__len) & (HH_DATA_MOD - 1)))
 208 #define HH_DATA_ALIGN(__len) \
 209         (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
 210         unsigned long   hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
 211 };
 212
 213 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
 214  * Alternative is:
 215  *   dev->hard_header_len ? (dev->hard_header_len +
 216  *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
 217  *
 218  * We could use other alignment values, but we must maintain the
 219  * relationship HH alignment <= LL alignment.
 220  */
 221 #define LL_RESERVED_SPACE(dev) \
 222         (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 223 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
 224         ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 225
 226 /* These flag bits are private to the generic network queueing
 227  * layer, they may not be explicitly referenced by any other
 228  * code.
 229  */
 230
 231 enum netdev_state_t
 232 {
 233         __LINK_STATE_XOFF=0,
 234         __LINK_STATE_START,
 235         __LINK_STATE_PRESENT,
 236         __LINK_STATE_SCHED,
 237         __LINK_STATE_NOCARRIER,
 238         __LINK_STATE_RX_SCHED,
 239         __LINK_STATE_LINKWATCH_PENDING
 240 };
 241
 242
 243 /*
 244  * This structure holds at boot time configured netdevice settings. They
 245  * are then used in the device probing.
 246  */
 247 struct netdev_boot_setup {
 248         char name[IFNAMSIZ];
 249         struct ifmap map;
 250 };
 251 #define NETDEV_BOOT_SETUP_MAX 8
 252
 253
 254 /*
 255  *      The DEVICE structure.
 256  *      Actually, this whole structure is a big mistake.  It mixes I/O
 257  *      data with strictly "high-level" data, and it has to know about
 258  *      almost every data structure used in the INET module.
 259  *
 260  *      FIXME: cleanup struct net_device such that network protocol info
 261  *      moves out.
 262  */
 263
 264 struct net_device
 265 {
 266
 267         /*
 268          * This is the first field of the "visible" part of this structure
 269          * (i.e. as seen by users in the "Space.c" file).  It is the name
 270          * the interface.
 271          */
 272         char                    name[IFNAMSIZ];
 273
 274         /*
 275          *      I/O specific fields
 276          *      FIXME: Merge these and struct ifmap into one
 277          */
 278         unsigned long           mem_end;        /* shared mem end       */
 279         unsigned long           mem_start;      /* shared mem start     */
 280         unsigned long           base_addr;      /* device I/O address   */
 281         unsigned int            irq;            /* device IRQ number    */
 282
 283         /*
 284          *      Some hardware also needs these fields, but they are not
 285          *      part of the usual set specified in Space.c.
 286          */
 287
 288         unsigned char           if_port;        /* Selectable AUI, TP,..*/
 289         unsigned char           dma;            /* DMA channel          */
 290
 291         unsigned long           state;
 292
 293         struct net_device       *next;
 294
 295         /* The device initialization function. Called only once. */
 296         int                     (*init)(struct net_device *dev);
 297
 298         /* ------- Fields preinitialized in Space.c finish here ------- */
 299
 300         struct net_device       *next_sched;
 301
 302         /* Interface index. Unique device identifier    */
 303         int                     ifindex;
 304         int                     iflink;
 305
 306
 307         struct net_device_stats* (*get_stats)(struct net_device *dev);
 308         struct iw_statistics*   (*get_wireless_stats)(struct net_device *dev);
 309
 310         /* List of functions to handle Wireless Extensions (instead of ioctl).
 311          * See <net/iw_handler.h> for details. Jean II */
 312         const struct iw_handler_def *   wireless_handlers;
 313         /* Instance data managed by the core of Wireless Extensions. */
 314         struct iw_public_data * wireless_data;
 315
 316         struct ethtool_ops *ethtool_ops;
 317
 318         /*
 319          * This marks the end of the "visible" part of the structure. All
 320          * fields hereafter are internal to the system, and may change at
 321          * will (read: may be cleaned up at will).
 322          */
 323
 324         /* These may be needed for future network-power-down code. */
 325         unsigned long           trans_start;    /* Time (in jiffies) of last Tx */
 326         unsigned long           last_rx;        /* Time of last Rx      */
 327
 328         unsigned short          flags;  /* interface flags (a la BSD)   */
 329         unsigned short          gflags;
 330         unsigned short          priv_flags; /* Like 'flags' but invisible to userspace. */
 331         unsigned short          padded; /* How much padding added by alloc_netdev() */
 332
 333         unsigned                mtu;    /* interface MTU value          */
 334         unsigned short          type;   /* interface hardware type      */
 335         unsigned short          hard_header_len;        /* hardware hdr length  */
 336         void                    *priv;  /* pointer to private data      */
 337
 338         struct net_device       *master; /* Pointer to master device of a group,
 339                                           * which this device is member of.
 340                                           */
 341
 342         /* Interface address info. */
 343         unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
 344         unsigned char           dev_addr[MAX_ADDR_LEN]; /* hw address   */
 345         unsigned char           addr_len;       /* hardware address length      */
 346         unsigned short          dev_id;         /* for shared network cards */
 347
 348         struct dev_mc_list      *mc_list;       /* Multicast mac addresses      */
 349         int                     mc_count;       /* Number of installed mcasts   */
 350         int                     promiscuity;
 351         int                     allmulti;
 352
 353         int                     watchdog_timeo;
 354         struct timer_list       watchdog_timer;
 355
 356         /* Protocol specific pointers */
 357
 358         void                    *atalk_ptr;     /* AppleTalk link       */
 359         void                    *ip_ptr;        /* IPv4 specific data   */
 360         void                    *dn_ptr;        /* DECnet specific data */
 361         void                    *ip6_ptr;       /* IPv6 specific data */
 362         void                    *ec_ptr;        /* Econet specific data */
 363         void                    *ax25_ptr;      /* AX.25 specific data */
 364
 365         struct list_head        poll_list;      /* Link to poll list    */
 366         int                     quota;
 367         int                     weight;
 368
 369         struct Qdisc            *qdisc;
 370         struct Qdisc            *qdisc_sleeping;
 371         struct Qdisc            *qdisc_ingress;
 372         struct list_head        qdisc_list;
 373         unsigned long           tx_queue_len;   /* Max frames per queue allowed */
 374
 375         /* ingress path synchronizer */
 376         spinlock_t              ingress_lock;
 377         /* hard_start_xmit synchronizer */
 378         spinlock_t              xmit_lock;
 379         /* cpu id of processor entered to hard_start_xmit or -1,
 380            if nobody entered there.
 381          */
 382         int                     xmit_lock_owner;
 383         /* device queue lock */
 384         spinlock_t              queue_lock;
 385         /* Number of references to this device */
 386         atomic_t                refcnt;
 387         /* delayed register/unregister */
 388         struct list_head        todo_list;
 389         /* device name hash chain */
 390         struct hlist_node       name_hlist;
 391         /* device index hash chain */
 392         struct hlist_node       index_hlist;
 393
 394         /* register/unregister state machine */
 395         enum { NETREG_UNINITIALIZED=0,
 396                NETREG_REGISTERING,      /* called register_netdevice */
 397                NETREG_REGISTERED,       /* completed register todo */
 398                NETREG_UNREGISTERING,    /* called unregister_netdevice */
 399                NETREG_UNREGISTERED,     /* completed unregister todo */
 400                NETREG_RELEASED,         /* called free_netdev */
 401         } reg_state;
 402
 403         /* Net device features */
 404         int                     features;
 405 #define NETIF_F_SG              1       /* Scatter/gather IO. */
 406 #define NETIF_F_IP_CSUM         2       /* Can checksum only TCP/UDP over IPv4. */
 407 #define NETIF_F_NO_CSUM         4       /* Does not require checksum. F.e. loopack. */
 408 #define NETIF_F_HW_CSUM         8       /* Can checksum all the packets. */
 409 #define NETIF_F_HIGHDMA         32      /* Can DMA to high memory. */
 410 #define NETIF_F_FRAGLIST        64      /* Scatter/gather IO. */
 411 #define NETIF_F_HW_VLAN_TX      128     /* Transmit VLAN hw acceleration */
 412 #define NETIF_F_HW_VLAN_RX      256     /* Receive VLAN hw acceleration */
 413 #define NETIF_F_HW_VLAN_FILTER  512     /* Receive filtering on VLAN */
 414 #define NETIF_F_VLAN_CHALLENGED 1024    /* Device cannot handle VLAN packets */
 415 #define NETIF_F_TSO             2048    /* Can offload TCP/IP segmentation */
 416 #define NETIF_F_LLTX            4096    /* LockLess TX */
 417
 418         /* Called after device is detached from network. */
 419         void                    (*uninit)(struct net_device *dev);
 420         /* Called after last user reference disappears. */
 421         void                    (*destructor)(struct net_device *dev);
 422
 423         /* Pointers to interface service routines.      */
 424         int                     (*open)(struct net_device *dev);
 425         int                     (*stop)(struct net_device *dev);
 426         int                     (*hard_start_xmit) (struct sk_buff *skb,
 427                                                     struct net_device *dev);
 428 #define HAVE_NETDEV_POLL
 429         int                     (*poll) (struct net_device *dev, int *quota);
 430         int                     (*hard_header) (struct sk_buff *skb,
 431                                                 struct net_device *dev,
 432                                                 unsigned short type,
 433                                                 void *daddr,
 434                                                 void *saddr,
 435                                                 unsigned len);
 436         int                     (*rebuild_header)(struct sk_buff *skb);
 437 #define HAVE_MULTICAST
 438         void                    (*set_multicast_list)(struct net_device *dev);
 439 #define HAVE_SET_MAC_ADDR
 440         int                     (*set_mac_address)(struct net_device *dev,
 441                                                    void *addr);
 442 #define HAVE_PRIVATE_IOCTL
 443         int                     (*do_ioctl)(struct net_device *dev,
 444                                             struct ifreq *ifr, int cmd);
 445 #define HAVE_SET_CONFIG
 446         int                     (*set_config)(struct net_device *dev,
 447                                               struct ifmap *map);
 448 #define HAVE_HEADER_CACHE
 449         int                     (*hard_header_cache)(struct neighbour *neigh,
 450                                                      struct hh_cache *hh);
 451         void                    (*header_cache_update)(struct hh_cache *hh,
 452                                                        struct net_device *dev,
 453                                                        unsigned char *  haddr);
 454 #define HAVE_CHANGE_MTU
 455         int                     (*change_mtu)(struct net_device *dev, int new_mtu);
 456
 457 #define HAVE_TX_TIMEOUT
 458         void                    (*tx_timeout) (struct net_device *dev);
 459
 460         void                    (*vlan_rx_register)(struct net_device *dev,
 461                                                     struct vlan_group *grp);
 462         void                    (*vlan_rx_add_vid)(struct net_device *dev,
 463                                                    unsigned short vid);
 464         void                    (*vlan_rx_kill_vid)(struct net_device *dev,
 465                                                     unsigned short vid);
 466
 467         int                     (*hard_header_parse)(struct sk_buff *skb,
 468                                                      unsigned char *haddr);
 469         int                     (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
 470 #ifdef CONFIG_NETPOLL
 471         struct netpoll          *np;
 472 #endif
 473 #ifdef CONFIG_NET_POLL_CONTROLLER
 474         void                    (*poll_controller)(struct net_device *dev);
 475 #endif
 476
 477         /* bridge stuff */
 478         struct net_bridge_port  *br_port;
 479
 480 #ifdef CONFIG_NET_DIVERT
 481         /* this will get initialized at each interface type init routine */
 482         struct divert_blk       *divert;
 483 #endif /* CONFIG_NET_DIVERT */
 484
 485         /* class/net/name entry */
 486         struct class_device     class_dev;
 487 };
 488
 489 #define NETDEV_ALIGN            32
 490 #define NETDEV_ALIGN_CONST      (NETDEV_ALIGN - 1)
 491
 492 static inline void *netdev_priv(struct net_device *dev)
 493 {
 494         return (char *)dev + ((sizeof(struct net_device)
 495                                         + NETDEV_ALIGN_CONST)
 496                                 & ~NETDEV_ALIGN_CONST);
 497 }
 498
 499 #define SET_MODULE_OWNER(dev) do { } while (0)
 500 /* Set the sysfs physical device reference for the network logical device
 501  * if set prior to registration will cause a symlink during initialization.
 502  */
 503 #define SET_NETDEV_DEV(net, pdev)       ((net)->class_dev.dev = (pdev))
 504
 505 struct packet_type {
 506         unsigned short          type;   /* This is really htons(ether_type).    */
 507         struct net_device               *dev;   /* NULL is wildcarded here              */
 508         int                     (*func) (struct sk_buff *, struct net_device *,
 509                                          struct packet_type *);
 510         void                    *af_packet_priv;
 511         struct list_head        list;
 512 };
 513
 514 #include <linux/interrupt.h>
 515 #include <linux/notifier.h>
 516
 517 extern struct net_device                loopback_dev;           /* The loopback */
 518 extern struct net_device                *dev_base;              /* All devices */
 519 extern rwlock_t                         dev_base_lock;          /* Device list lock */
 520
 521 extern int                      netdev_boot_setup_check(struct net_device *dev);
 522 extern unsigned long            netdev_boot_base(const char *prefix, int unit);
 523 extern struct net_device    *dev_getbyhwaddr(unsigned short type, char *hwaddr);
 524 extern struct net_device *dev_getfirstbyhwtype(unsigned short type);
 525 extern void             dev_add_pack(struct packet_type *pt);
 526 extern void             dev_remove_pack(struct packet_type *pt);
 527 extern void             __dev_remove_pack(struct packet_type *pt);
 528
 529 extern struct net_device        *dev_get_by_flags(unsigned short flags,
 530                                                   unsigned short mask);
 531 extern struct net_device        *dev_get_by_name(const char *name);
 532 extern struct net_device        *__dev_get_by_name(const char *name);
 533 extern int              dev_alloc_name(struct net_device *dev, const char *name);
 534 extern int              dev_open(struct net_device *dev);
 535 extern int              dev_close(struct net_device *dev);
 536 extern int              dev_queue_xmit(struct sk_buff *skb);
 537 extern int              register_netdevice(struct net_device *dev);
 538 extern int              unregister_netdevice(struct net_device *dev);
 539 extern void             free_netdev(struct net_device *dev);
 540 extern void             synchronize_net(void);
 541 extern int              register_netdevice_notifier(struct notifier_block *nb);
 542 extern int              unregister_netdevice_notifier(struct notifier_block *nb);
 543 extern int              call_netdevice_notifiers(unsigned long val, void *v);
 544 extern struct net_device        *dev_get_by_index(int ifindex);
 545 extern struct net_device        *__dev_get_by_index(int ifindex);
 546 extern int              dev_restart(struct net_device *dev);
 547 #ifdef CONFIG_NETPOLL_TRAP
 548 extern int              netpoll_trap(void);
 549 #endif
 550
 551 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
 552 extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
 553 static inline int unregister_gifconf(unsigned int family)
 554 {
 555         return register_gifconf(family, NULL);
 556 }
 557
 558 /*
 559  * Incoming packets are placed on per-cpu queues so that
 560  * no locking is needed.
 561  */
 562
 563 struct softnet_data
 564 {
 565         int                     throttle;
 566         int                     cng_level;
 567         int                     avg_blog;
 568         struct sk_buff_head     input_pkt_queue;
 569         struct list_head        poll_list;
 570         struct net_device       *output_queue;
 571         struct sk_buff          *completion_queue;
 572
 573         struct net_device       backlog_dev;    /* Sorry. 8) */
 574 };
 575
 576 DECLARE_PER_CPU(struct softnet_data,softnet_data);
 577
 578 #define HAVE_NETIF_QUEUE
 579
 580 static inline void __netif_schedule(struct net_device *dev)
 581 {
 582         if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
 583                 unsigned long flags;
 584                 struct softnet_data *sd;
 585
 586                 local_irq_save(flags);
 587                 sd = &__get_cpu_var(softnet_data);
 588                 dev->next_sched = sd->output_queue;
 589                 sd->output_queue = dev;
 590                 raise_softirq_irqoff(NET_TX_SOFTIRQ);
 591                 local_irq_restore(flags);
 592         }
 593 }
 594
 595 static inline void netif_schedule(struct net_device *dev)
 596 {
 597         if (!test_bit(__LINK_STATE_XOFF, &dev->state))
 598                 __netif_schedule(dev);
 599 }
 600
 601 static inline void netif_start_queue(struct net_device *dev)
 602 {
 603         clear_bit(__LINK_STATE_XOFF, &dev->state);
 604 }
 605
 606 static inline void netif_wake_queue(struct net_device *dev)
 607 {
 608 #ifdef CONFIG_NETPOLL_TRAP
 609         if (netpoll_trap())
 610                 return;
 611 #endif
 612         if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
 613                 __netif_schedule(dev);
 614 }
 615
 616 static inline void netif_stop_queue(struct net_device *dev)
 617 {
 618 #ifdef CONFIG_NETPOLL_TRAP
 619         if (netpoll_trap())
 620                 return;
 621 #endif
 622         set_bit(__LINK_STATE_XOFF, &dev->state);
 623 }
 624
 625 static inline int netif_queue_stopped(const struct net_device *dev)
 626 {
 627         return test_bit(__LINK_STATE_XOFF, &dev->state);
 628 }
 629
 630 static inline int netif_running(const struct net_device *dev)
 631 {
 632         return test_bit(__LINK_STATE_START, &dev->state);
 633 }
 634
 635
 636 /* Use this variant when it is known for sure that it
 637  * is executing from interrupt context.
 638  */
 639 static inline void dev_kfree_skb_irq(struct sk_buff *skb)
 640 {
 641         if (atomic_dec_and_test(&skb->users)) {
 642                 struct softnet_data *sd;
 643                 unsigned long flags;
 644
 645                 local_irq_save(flags);
 646                 sd = &__get_cpu_var(softnet_data);
 647                 skb->next = sd->completion_queue;
 648                 sd->completion_queue = skb;
 649                 raise_softirq_irqoff(NET_TX_SOFTIRQ);
 650                 local_irq_restore(flags);
 651         }
 652 }
 653
 654 /* Use this variant in places where it could be invoked
 655  * either from interrupt or non-interrupt context.
 656  */
 657 static inline void dev_kfree_skb_any(struct sk_buff *skb)
 658 {
 659         if (in_irq() || irqs_disabled())
 660                 dev_kfree_skb_irq(skb);
 661         else
 662                 dev_kfree_skb(skb);
 663 }
 664
 665 #define HAVE_NETIF_RX 1
 666 extern int              netif_rx(struct sk_buff *skb);
 667 extern int              netif_rx_ni(struct sk_buff *skb);
 668 #define HAVE_NETIF_RECEIVE_SKB 1
 669 extern int              netif_receive_skb(struct sk_buff *skb);
 670 extern int              dev_ioctl(unsigned int cmd, void __user *);
 671 extern int              dev_ethtool(struct ifreq *);
 672 extern unsigned         dev_get_flags(const struct net_device *);
 673 extern int              dev_change_flags(struct net_device *, unsigned);
 674 extern int              dev_change_name(struct net_device *, char *);
 675 extern int              dev_set_mtu(struct net_device *, int);
 676 extern int              dev_set_mac_address(struct net_device *,
 677                                             struct sockaddr *);
 678 extern void             dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev);
 679
 680 extern void             dev_init(void);
 681
 682 extern int              netdev_nit;
 683
 684 /* Called by rtnetlink.c:rtnl_unlock() */
 685 extern void netdev_run_todo(void);
 686
 687 static inline void dev_put(struct net_device *dev)
 688 {
 689         atomic_dec(&dev->refcnt);
 690 }
 691
 692 #define __dev_put(dev) atomic_dec(&(dev)->refcnt)
 693 #define dev_hold(dev) atomic_inc(&(dev)->refcnt)
 694
 695 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
 696  * and _off may be called from IRQ context, but it is caller
 697  * who is responsible for serialization of these calls.
 698  */
 699
 700 extern void linkwatch_fire_event(struct net_device *dev);
 701
 702 static inline int netif_carrier_ok(const struct net_device *dev)
 703 {
 704         return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
 705 }
 706
 707 extern void __netdev_watchdog_up(struct net_device *dev);
 708
 709 static inline void netif_carrier_on(struct net_device *dev)
 710 {
 711         if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state))
 712                 linkwatch_fire_event(dev);
 713         if (netif_running(dev))
 714                 __netdev_watchdog_up(dev);
 715 }
 716
 717 static inline void netif_carrier_off(struct net_device *dev)
 718 {
 719         if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state))
 720                 linkwatch_fire_event(dev);
 721 }
 722
 723 /* Hot-plugging. */
 724 static inline int netif_device_present(struct net_device *dev)
 725 {
 726         return test_bit(__LINK_STATE_PRESENT, &dev->state);
 727 }
 728
 729 static inline void netif_device_detach(struct net_device *dev)
 730 {
 731         if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
 732             netif_running(dev)) {
 733                 netif_stop_queue(dev);
 734         }
 735 }
 736
 737 static inline void netif_device_attach(struct net_device *dev)
 738 {
 739         if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
 740             netif_running(dev)) {
 741                 netif_wake_queue(dev);
 742                 __netdev_watchdog_up(dev);
 743         }
 744 }
 745
 746 /*
 747  * Network interface message level settings
 748  */
 749 #define HAVE_NETIF_MSG 1
 750
 751 enum {
 752         NETIF_MSG_DRV           = 0x0001,
 753         NETIF_MSG_PROBE         = 0x0002,
 754         NETIF_MSG_LINK          = 0x0004,
 755         NETIF_MSG_TIMER         = 0x0008,
 756         NETIF_MSG_IFDOWN        = 0x0010,
 757         NETIF_MSG_IFUP          = 0x0020,
 758         NETIF_MSG_RX_ERR        = 0x0040,
 759         NETIF_MSG_TX_ERR        = 0x0080,
 760         NETIF_MSG_TX_QUEUED     = 0x0100,
 761         NETIF_MSG_INTR          = 0x0200,
 762         NETIF_MSG_TX_DONE       = 0x0400,
 763         NETIF_MSG_RX_STATUS     = 0x0800,
 764         NETIF_MSG_PKTDATA       = 0x1000,
 765         NETIF_MSG_HW            = 0x2000,
 766         NETIF_MSG_WOL           = 0x4000,
 767 };
 768
 769 #define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
 770 #define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
 771 #define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
 772 #define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
 773 #define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
 774 #define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
 775 #define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
 776 #define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
 777 #define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
 778 #define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
 779 #define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
 780 #define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
 781 #define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
 782 #define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
 783 #define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
 784
 785 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
 786 {
 787         /* use default */
 788         if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
 789                 return default_msg_enable_bits;
 790         if (debug_value == 0)   /* no output */
 791                 return 0;
 792         /* set low N bits */
 793         return (1 << debug_value) - 1;
 794 }
 795
 796 /* Schedule rx intr now? */
 797
 798 static inline int netif_rx_schedule_prep(struct net_device *dev)
 799 {
 800         return netif_running(dev) &&
 801                 !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state);
 802 }
 803
 804 /* Add interface to tail of rx poll list. This assumes that _prep has
 805  * already been called and returned 1.
 806  */
 807
 808 static inline void __netif_rx_schedule(struct net_device *dev)
 809 {
 810         unsigned long flags;
 811
 812         local_irq_save(flags);
 813         dev_hold(dev);
 814         list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
 815         if (dev->quota < 0)
 816                 dev->quota += dev->weight;
 817         else
 818                 dev->quota = dev->weight;
 819         __raise_softirq_irqoff(NET_RX_SOFTIRQ);
 820         local_irq_restore(flags);
 821 }
 822
 823 /* Try to reschedule poll. Called by irq handler. */
 824
 825 static inline void netif_rx_schedule(struct net_device *dev)
 826 {
 827         if (netif_rx_schedule_prep(dev))
 828                 __netif_rx_schedule(dev);
 829 }
 830
 831 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().
 832  * Do not inline this?
 833  */
 834 static inline int netif_rx_reschedule(struct net_device *dev, int undo)
 835 {
 836         if (netif_rx_schedule_prep(dev)) {
 837                 unsigned long flags;
 838
 839                 dev->quota += undo;
 840
 841                 local_irq_save(flags);
 842                 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
 843                 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
 844                 local_irq_restore(flags);
 845                 return 1;
 846         }
 847         return 0;
 848 }
 849
 850 /* Remove interface from poll list: it must be in the poll list
 851  * on current cpu. This primitive is called by dev->poll(), when
 852  * it completes the work. The device cannot be out of poll list at this
 853  * moment, it is BUG().
 854  */
 855 static inline void netif_rx_complete(struct net_device *dev)
 856 {
 857         unsigned long flags;
 858
 859         local_irq_save(flags);
 860         BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
 861         list_del(&dev->poll_list);
 862         smp_mb__before_clear_bit();
 863         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 864         local_irq_restore(flags);
 865 }
 866
 867 static inline void netif_poll_disable(struct net_device *dev)
 868 {
 869         while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
 870                 /* No hurry. */
 871                 current->state = TASK_INTERRUPTIBLE;
 872                 schedule_timeout(1);
 873         }
 874 }
 875
 876 static inline void netif_poll_enable(struct net_device *dev)
 877 {
 878         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 879 }
 880
 881 /* same as netif_rx_complete, except that local_irq_save(flags)
 882  * has already been issued
 883  */
 884 static inline void __netif_rx_complete(struct net_device *dev)
 885 {
 886         BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
 887         list_del(&dev->poll_list);
 888         smp_mb__before_clear_bit();
 889         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 890 }
 891
 892 static inline void netif_tx_disable(struct net_device *dev)
 893 {
 894         spin_lock_bh(&dev->xmit_lock);
 895         netif_stop_queue(dev);
 896         spin_unlock_bh(&dev->xmit_lock);
 897 }
 898
 899 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
 900
 901 extern void             ether_setup(struct net_device *dev);
 902
 903 /* Support for loadable net-drivers */
 904 extern struct net_device *alloc_netdev(int sizeof_priv, const char *name,
 905                                        void (*setup)(struct net_device *));
 906 extern int              register_netdev(struct net_device *dev);
 907 extern void             unregister_netdev(struct net_device *dev);
 908 /* Functions used for multicast support */
 909 extern void             dev_mc_upload(struct net_device *dev);
 910 extern int              dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
 911 extern int              dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
 912 extern void             dev_mc_discard(struct net_device *dev);
 913 extern void             dev_set_promiscuity(struct net_device *dev, int inc);
 914 extern void             dev_set_allmulti(struct net_device *dev, int inc);
 915 extern void             netdev_state_change(struct net_device *dev);
 916 /* Load a device via the kmod */
 917 extern void             dev_load(const char *name);
 918 extern void             dev_mcast_init(void);
 919 extern int              netdev_max_backlog;
 920 extern int              weight_p;
 921 extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
 922 extern int skb_checksum_help(struct sk_buff *skb, int inward);
 923 /* rx skb timestamps */
 924 extern void             net_enable_timestamp(void);
 925 extern void             net_disable_timestamp(void);
 926
 927 #ifdef CONFIG_SYSCTL
 928 extern char *net_sysctl_strdup(const char *s);
 929 #endif
 930
 931 #endif /* __KERNEL__ */
 932
 933 #endif  /* _LINUX_DEV_H */