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/device.h>
  38 #include <linux/percpu.h>
  39 #include <linux/dmaengine.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         __LINK_STATE_DORMANT,
 235         __LINK_STATE_QDISC_RUNNING,
 236 };
 237
 238
 239 /*
 240  * This structure holds at boot time configured netdevice settings. They
 241  * are then used in the device probing.
 242  */
 243 struct netdev_boot_setup {
 244         char name[IFNAMSIZ];
 245         struct ifmap map;
 246 };
 247 #define NETDEV_BOOT_SETUP_MAX 8
 248
 249 extern int __init netdev_boot_setup(char *str);
 250
 251 /*
 252  *      The DEVICE structure.
 253  *      Actually, this whole structure is a big mistake.  It mixes I/O
 254  *      data with strictly "high-level" data, and it has to know about
 255  *      almost every data structure used in the INET module.
 256  *
 257  *      FIXME: cleanup struct net_device such that network protocol info
 258  *      moves out.
 259  */
 260
 261 struct net_device
 262 {
 263
 264         /*
 265          * This is the first field of the "visible" part of this structure
 266          * (i.e. as seen by users in the "Space.c" file).  It is the name
 267          * the interface.
 268          */
 269         char                    name[IFNAMSIZ];
 270         /* device name hash chain */
 271         struct hlist_node       name_hlist;
 272
 273         /*
 274          *      I/O specific fields
 275          *      FIXME: Merge these and struct ifmap into one
 276          */
 277         unsigned long           mem_end;        /* shared mem end       */
 278         unsigned long           mem_start;      /* shared mem start     */
 279         unsigned long           base_addr;      /* device I/O address   */
 280         unsigned int            irq;            /* device IRQ number    */
 281
 282         /*
 283          *      Some hardware also needs these fields, but they are not
 284          *      part of the usual set specified in Space.c.
 285          */
 286
 287         unsigned char           if_port;        /* Selectable AUI, TP,..*/
 288         unsigned char           dma;            /* DMA channel          */
 289
 290         unsigned long           state;
 291
 292         struct net_device       *next;
 293
 294         /* The device initialization function. Called only once. */
 295         int                     (*init)(struct net_device *dev);
 296
 297         /* ------- Fields preinitialized in Space.c finish here ------- */
 298
 299         /* Net device features */
 300         unsigned long           features;
 301 #define NETIF_F_SG              1       /* Scatter/gather IO. */
 302 #define NETIF_F_IP_CSUM         2       /* Can checksum only TCP/UDP over IPv4. */
 303 #define NETIF_F_NO_CSUM         4       /* Does not require checksum. F.e. loopack. */
 304 #define NETIF_F_HW_CSUM         8       /* Can checksum all the packets. */
 305 #define NETIF_F_HIGHDMA         32      /* Can DMA to high memory. */
 306 #define NETIF_F_FRAGLIST        64      /* Scatter/gather IO. */
 307 #define NETIF_F_HW_VLAN_TX      128     /* Transmit VLAN hw acceleration */
 308 #define NETIF_F_HW_VLAN_RX      256     /* Receive VLAN hw acceleration */
 309 #define NETIF_F_HW_VLAN_FILTER  512     /* Receive filtering on VLAN */
 310 #define NETIF_F_VLAN_CHALLENGED 1024    /* Device cannot handle VLAN packets */
 311 #define NETIF_F_GSO             2048    /* Enable software GSO. */
 312 #define NETIF_F_LLTX            4096    /* LockLess TX */
 313
 314         /* Segmentation offload features */
 315 #define NETIF_F_GSO_SHIFT       16
 316 #define NETIF_F_GSO_MASK        0xffff0000
 317 #define NETIF_F_TSO             (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
 318 #define NETIF_F_UFO             (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
 319 #define NETIF_F_GSO_ROBUST      (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
 320 #define NETIF_F_TSO_ECN         (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
 321 #define NETIF_F_TSO6            (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
 322
 323 #define NETIF_F_GEN_CSUM        (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
 324 #define NETIF_F_ALL_CSUM        (NETIF_F_IP_CSUM | NETIF_F_GEN_CSUM)
 325
 326         struct net_device       *next_sched;
 327
 328         /* Interface index. Unique device identifier    */
 329         int                     ifindex;
 330         int                     iflink;
 331
 332
 333         struct net_device_stats* (*get_stats)(struct net_device *dev);
 334         struct iw_statistics*   (*get_wireless_stats)(struct net_device *dev);
 335
 336         /* List of functions to handle Wireless Extensions (instead of ioctl).
 337          * See <net/iw_handler.h> for details. Jean II */
 338         const struct iw_handler_def *   wireless_handlers;
 339         /* Instance data managed by the core of Wireless Extensions. */
 340         struct iw_public_data * wireless_data;
 341
 342         struct ethtool_ops *ethtool_ops;
 343
 344         /*
 345          * This marks the end of the "visible" part of the structure. All
 346          * fields hereafter are internal to the system, and may change at
 347          * will (read: may be cleaned up at will).
 348          */
 349
 350
 351         unsigned int            flags;  /* interface flags (a la BSD)   */
 352         unsigned short          gflags;
 353         unsigned short          priv_flags; /* Like 'flags' but invisible to userspace. */
 354         unsigned short          padded; /* How much padding added by alloc_netdev() */
 355
 356         unsigned char           operstate; /* RFC2863 operstate */
 357         unsigned char           link_mode; /* mapping policy to operstate */
 358
 359         unsigned                mtu;    /* interface MTU value          */
 360         unsigned short          type;   /* interface hardware type      */
 361         unsigned short          hard_header_len;        /* hardware hdr length  */
 362
 363         struct net_device       *master; /* Pointer to master device of a group,
 364                                           * which this device is member of.
 365                                           */
 366
 367         /* Interface address info. */
 368         unsigned char           perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
 369         unsigned char           addr_len;       /* hardware address length      */
 370         unsigned short          dev_id;         /* for shared network cards */
 371
 372         struct dev_mc_list      *mc_list;       /* Multicast mac addresses      */
 373         int                     mc_count;       /* Number of installed mcasts   */
 374         int                     promiscuity;
 375         int                     allmulti;
 376
 377
 378         /* Protocol specific pointers */
 379
 380         void                    *atalk_ptr;     /* AppleTalk link       */
 381         void                    *ip_ptr;        /* IPv4 specific data   */
 382         void                    *dn_ptr;        /* DECnet specific data */
 383         void                    *ip6_ptr;       /* IPv6 specific data */
 384         void                    *ec_ptr;        /* Econet specific data */
 385         void                    *ax25_ptr;      /* AX.25 specific data */
 386
 387 /*
 388  * Cache line mostly used on receive path (including eth_type_trans())
 389  */
 390         struct list_head        poll_list ____cacheline_aligned_in_smp;
 391                                         /* Link to poll list    */
 392
 393         int                     (*poll) (struct net_device *dev, int *quota);
 394         int                     quota;
 395         int                     weight;
 396         unsigned long           last_rx;        /* Time of last Rx      */
 397         /* Interface address info used in eth_type_trans() */
 398         unsigned char           dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast
 399                                                         because most packets are unicast) */
 400
 401         unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
 402
 403 /*
 404  * Cache line mostly used on queue transmit path (qdisc)
 405  */
 406         /* device queue lock */
 407         spinlock_t              queue_lock ____cacheline_aligned_in_smp;
 408         struct Qdisc            *qdisc;
 409         struct Qdisc            *qdisc_sleeping;
 410         struct list_head        qdisc_list;
 411         unsigned long           tx_queue_len;   /* Max frames per queue allowed */
 412
 413         /* Partially transmitted GSO packet. */
 414         struct sk_buff          *gso_skb;
 415
 416         /* ingress path synchronizer */
 417         spinlock_t              ingress_lock;
 418         struct Qdisc            *qdisc_ingress;
 419
 420 /*
 421  * One part is mostly used on xmit path (device)
 422  */
 423         /* hard_start_xmit synchronizer */
 424         spinlock_t              _xmit_lock ____cacheline_aligned_in_smp;
 425         /* cpu id of processor entered to hard_start_xmit or -1,
 426            if nobody entered there.
 427          */
 428         int                     xmit_lock_owner;
 429         void                    *priv;  /* pointer to private data      */
 430         int                     (*hard_start_xmit) (struct sk_buff *skb,
 431                                                     struct net_device *dev);
 432         /* These may be needed for future network-power-down code. */
 433         unsigned long           trans_start;    /* Time (in jiffies) of last Tx */
 434
 435         int                     watchdog_timeo; /* used by dev_watchdog() */
 436         struct timer_list       watchdog_timer;
 437
 438 /*
 439  * refcnt is a very hot point, so align it on SMP
 440  */
 441         /* Number of references to this device */
 442         atomic_t                refcnt ____cacheline_aligned_in_smp;
 443
 444         /* delayed register/unregister */
 445         struct list_head        todo_list;
 446         /* device index hash chain */
 447         struct hlist_node       index_hlist;
 448
 449         /* register/unregister state machine */
 450         enum { NETREG_UNINITIALIZED=0,
 451                NETREG_REGISTERED,       /* completed register_netdevice */
 452                NETREG_UNREGISTERING,    /* called unregister_netdevice */
 453                NETREG_UNREGISTERED,     /* completed unregister todo */
 454                NETREG_RELEASED,         /* called free_netdev */
 455         } reg_state;
 456
 457         /* Called after device is detached from network. */
 458         void                    (*uninit)(struct net_device *dev);
 459         /* Called after last user reference disappears. */
 460         void                    (*destructor)(struct net_device *dev);
 461
 462         /* Pointers to interface service routines.      */
 463         int                     (*open)(struct net_device *dev);
 464         int                     (*stop)(struct net_device *dev);
 465 #define HAVE_NETDEV_POLL
 466         int                     (*hard_header) (struct sk_buff *skb,
 467                                                 struct net_device *dev,
 468                                                 unsigned short type,
 469                                                 void *daddr,
 470                                                 void *saddr,
 471                                                 unsigned len);
 472         int                     (*rebuild_header)(struct sk_buff *skb);
 473 #define HAVE_MULTICAST
 474         void                    (*set_multicast_list)(struct net_device *dev);
 475 #define HAVE_SET_MAC_ADDR
 476         int                     (*set_mac_address)(struct net_device *dev,
 477                                                    void *addr);
 478 #define HAVE_PRIVATE_IOCTL
 479         int                     (*do_ioctl)(struct net_device *dev,
 480                                             struct ifreq *ifr, int cmd);
 481 #define HAVE_SET_CONFIG
 482         int                     (*set_config)(struct net_device *dev,
 483                                               struct ifmap *map);
 484 #define HAVE_HEADER_CACHE
 485         int                     (*hard_header_cache)(struct neighbour *neigh,
 486                                                      struct hh_cache *hh);
 487         void                    (*header_cache_update)(struct hh_cache *hh,
 488                                                        struct net_device *dev,
 489                                                        unsigned char *  haddr);
 490 #define HAVE_CHANGE_MTU
 491         int                     (*change_mtu)(struct net_device *dev, int new_mtu);
 492
 493 #define HAVE_TX_TIMEOUT
 494         void                    (*tx_timeout) (struct net_device *dev);
 495
 496         void                    (*vlan_rx_register)(struct net_device *dev,
 497                                                     struct vlan_group *grp);
 498         void                    (*vlan_rx_add_vid)(struct net_device *dev,
 499                                                    unsigned short vid);
 500         void                    (*vlan_rx_kill_vid)(struct net_device *dev,
 501                                                     unsigned short vid);
 502
 503         int                     (*hard_header_parse)(struct sk_buff *skb,
 504                                                      unsigned char *haddr);
 505         int                     (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
 506 #ifdef CONFIG_NETPOLL
 507         struct netpoll_info     *npinfo;
 508 #endif
 509 #ifdef CONFIG_NET_POLL_CONTROLLER
 510         void                    (*poll_controller)(struct net_device *dev);
 511 #endif
 512
 513         /* bridge stuff */
 514         struct net_bridge_port  *br_port;
 515
 516 #ifdef CONFIG_NET_DIVERT
 517         /* this will get initialized at each interface type init routine */
 518         struct divert_blk       *divert;
 519 #endif /* CONFIG_NET_DIVERT */
 520
 521         /* class/net/name entry */
 522         struct class_device     class_dev;
 523         /* space for optional statistics and wireless sysfs groups */
 524         struct attribute_group  *sysfs_groups[3];
 525 };
 526
 527 #define NETDEV_ALIGN            32
 528 #define NETDEV_ALIGN_CONST      (NETDEV_ALIGN - 1)
 529
 530 static inline void *netdev_priv(struct net_device *dev)
 531 {
 532         return (char *)dev + ((sizeof(struct net_device)
 533                                         + NETDEV_ALIGN_CONST)
 534                                 & ~NETDEV_ALIGN_CONST);
 535 }
 536
 537 #define SET_MODULE_OWNER(dev) do { } while (0)
 538 /* Set the sysfs physical device reference for the network logical device
 539  * if set prior to registration will cause a symlink during initialization.
 540  */
 541 #define SET_NETDEV_DEV(net, pdev)       ((net)->class_dev.dev = (pdev))
 542
 543 struct packet_type {
 544         __be16                  type;   /* This is really htons(ether_type). */
 545         struct net_device       *dev;   /* NULL is wildcarded here           */
 546         int                     (*func) (struct sk_buff *,
 547                                          struct net_device *,
 548                                          struct packet_type *,
 549                                          struct net_device *);
 550         struct sk_buff          *(*gso_segment)(struct sk_buff *skb,
 551                                                 int features);
 552         int                     (*gso_send_check)(struct sk_buff *skb);
 553         void                    *af_packet_priv;
 554         struct list_head        list;
 555 };
 556
 557 #include <linux/interrupt.h>
 558 #include <linux/notifier.h>
 559
 560 extern struct net_device                loopback_dev;           /* The loopback */
 561 extern struct net_device                *dev_base;              /* All devices */
 562 extern rwlock_t                         dev_base_lock;          /* Device list lock */
 563
 564 extern int                      netdev_boot_setup_check(struct net_device *dev);
 565 extern unsigned long            netdev_boot_base(const char *prefix, int unit);
 566 extern struct net_device    *dev_getbyhwaddr(unsigned short type, char *hwaddr);
 567 extern struct net_device *dev_getfirstbyhwtype(unsigned short type);
 568 extern void             dev_add_pack(struct packet_type *pt);
 569 extern void             dev_remove_pack(struct packet_type *pt);
 570 extern void             __dev_remove_pack(struct packet_type *pt);
 571
 572 extern struct net_device        *dev_get_by_flags(unsigned short flags,
 573                                                   unsigned short mask);
 574 extern struct net_device        *dev_get_by_name(const char *name);
 575 extern struct net_device        *__dev_get_by_name(const char *name);
 576 extern int              dev_alloc_name(struct net_device *dev, const char *name);
 577 extern int              dev_open(struct net_device *dev);
 578 extern int              dev_close(struct net_device *dev);
 579 extern int              dev_queue_xmit(struct sk_buff *skb);
 580 extern int              register_netdevice(struct net_device *dev);
 581 extern int              unregister_netdevice(struct net_device *dev);
 582 extern void             free_netdev(struct net_device *dev);
 583 extern void             synchronize_net(void);
 584 extern int              register_netdevice_notifier(struct notifier_block *nb);
 585 extern int              unregister_netdevice_notifier(struct notifier_block *nb);
 586 extern int              call_netdevice_notifiers(unsigned long val, void *v);
 587 extern struct net_device        *dev_get_by_index(int ifindex);
 588 extern struct net_device        *__dev_get_by_index(int ifindex);
 589 extern int              dev_restart(struct net_device *dev);
 590 #ifdef CONFIG_NETPOLL_TRAP
 591 extern int              netpoll_trap(void);
 592 #endif
 593
 594 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
 595 extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
 596 static inline int unregister_gifconf(unsigned int family)
 597 {
 598         return register_gifconf(family, NULL);
 599 }
 600
 601 /*
 602  * Incoming packets are placed on per-cpu queues so that
 603  * no locking is needed.
 604  */
 605
 606 struct softnet_data
 607 {
 608         struct net_device       *output_queue;
 609         struct sk_buff_head     input_pkt_queue;
 610         struct list_head        poll_list;
 611         struct sk_buff          *completion_queue;
 612
 613         struct net_device       backlog_dev;    /* Sorry. 8) */
 614 #ifdef CONFIG_NET_DMA
 615         struct dma_chan         *net_dma;
 616 #endif
 617 };
 618
 619 DECLARE_PER_CPU(struct softnet_data,softnet_data);
 620
 621 #define HAVE_NETIF_QUEUE
 622
 623 extern void __netif_schedule(struct net_device *dev);
 624
 625 static inline void netif_schedule(struct net_device *dev)
 626 {
 627         if (!test_bit(__LINK_STATE_XOFF, &dev->state))
 628                 __netif_schedule(dev);
 629 }
 630
 631 static inline void netif_start_queue(struct net_device *dev)
 632 {
 633         clear_bit(__LINK_STATE_XOFF, &dev->state);
 634 }
 635
 636 static inline void netif_wake_queue(struct net_device *dev)
 637 {
 638 #ifdef CONFIG_NETPOLL_TRAP
 639         if (netpoll_trap())
 640                 return;
 641 #endif
 642         if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
 643                 __netif_schedule(dev);
 644 }
 645
 646 static inline void netif_stop_queue(struct net_device *dev)
 647 {
 648 #ifdef CONFIG_NETPOLL_TRAP
 649         if (netpoll_trap())
 650                 return;
 651 #endif
 652         set_bit(__LINK_STATE_XOFF, &dev->state);
 653 }
 654
 655 static inline int netif_queue_stopped(const struct net_device *dev)
 656 {
 657         return test_bit(__LINK_STATE_XOFF, &dev->state);
 658 }
 659
 660 static inline int netif_running(const struct net_device *dev)
 661 {
 662         return test_bit(__LINK_STATE_START, &dev->state);
 663 }
 664
 665
 666 /* Use this variant when it is known for sure that it
 667  * is executing from interrupt context.
 668  */
 669 static inline void dev_kfree_skb_irq(struct sk_buff *skb)
 670 {
 671         if (atomic_dec_and_test(&skb->users)) {
 672                 struct softnet_data *sd;
 673                 unsigned long flags;
 674
 675                 local_irq_save(flags);
 676                 sd = &__get_cpu_var(softnet_data);
 677                 skb->next = sd->completion_queue;
 678                 sd->completion_queue = skb;
 679                 raise_softirq_irqoff(NET_TX_SOFTIRQ);
 680                 local_irq_restore(flags);
 681         }
 682 }
 683
 684 /* Use this variant in places where it could be invoked
 685  * either from interrupt or non-interrupt context.
 686  */
 687 extern void dev_kfree_skb_any(struct sk_buff *skb);
 688
 689 #define HAVE_NETIF_RX 1
 690 extern int              netif_rx(struct sk_buff *skb);
 691 extern int              netif_rx_ni(struct sk_buff *skb);
 692 #define HAVE_NETIF_RECEIVE_SKB 1
 693 extern int              netif_receive_skb(struct sk_buff *skb);
 694 extern int              dev_valid_name(const char *name);
 695 extern int              dev_ioctl(unsigned int cmd, void __user *);
 696 extern int              dev_ethtool(struct ifreq *);
 697 extern unsigned         dev_get_flags(const struct net_device *);
 698 extern int              dev_change_flags(struct net_device *, unsigned);
 699 extern int              dev_change_name(struct net_device *, char *);
 700 extern int              dev_set_mtu(struct net_device *, int);
 701 extern int              dev_set_mac_address(struct net_device *,
 702                                             struct sockaddr *);
 703 extern int              dev_hard_start_xmit(struct sk_buff *skb,
 704                                             struct net_device *dev);
 705
 706 extern void             dev_init(void);
 707
 708 extern int              netdev_budget;
 709
 710 /* Called by rtnetlink.c:rtnl_unlock() */
 711 extern void netdev_run_todo(void);
 712
 713 static inline void dev_put(struct net_device *dev)
 714 {
 715         atomic_dec(&dev->refcnt);
 716 }
 717
 718 static inline void dev_hold(struct net_device *dev)
 719 {
 720         atomic_inc(&dev->refcnt);
 721 }
 722
 723 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
 724  * and _off may be called from IRQ context, but it is caller
 725  * who is responsible for serialization of these calls.
 726  *
 727  * The name carrier is inappropriate, these functions should really be
 728  * called netif_lowerlayer_*() because they represent the state of any
 729  * kind of lower layer not just hardware media.
 730  */
 731
 732 extern void linkwatch_fire_event(struct net_device *dev);
 733
 734 static inline int netif_carrier_ok(const struct net_device *dev)
 735 {
 736         return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
 737 }
 738
 739 extern void __netdev_watchdog_up(struct net_device *dev);
 740
 741 extern void netif_carrier_on(struct net_device *dev);
 742
 743 extern void netif_carrier_off(struct net_device *dev);
 744
 745 static inline void netif_dormant_on(struct net_device *dev)
 746 {
 747         if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
 748                 linkwatch_fire_event(dev);
 749 }
 750
 751 static inline void netif_dormant_off(struct net_device *dev)
 752 {
 753         if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
 754                 linkwatch_fire_event(dev);
 755 }
 756
 757 static inline int netif_dormant(const struct net_device *dev)
 758 {
 759         return test_bit(__LINK_STATE_DORMANT, &dev->state);
 760 }
 761
 762
 763 static inline int netif_oper_up(const struct net_device *dev) {
 764         return (dev->operstate == IF_OPER_UP ||
 765                 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
 766 }
 767
 768 /* Hot-plugging. */
 769 static inline int netif_device_present(struct net_device *dev)
 770 {
 771         return test_bit(__LINK_STATE_PRESENT, &dev->state);
 772 }
 773
 774 extern void netif_device_detach(struct net_device *dev);
 775
 776 extern void netif_device_attach(struct net_device *dev);
 777
 778 /*
 779  * Network interface message level settings
 780  */
 781 #define HAVE_NETIF_MSG 1
 782
 783 enum {
 784         NETIF_MSG_DRV           = 0x0001,
 785         NETIF_MSG_PROBE         = 0x0002,
 786         NETIF_MSG_LINK          = 0x0004,
 787         NETIF_MSG_TIMER         = 0x0008,
 788         NETIF_MSG_IFDOWN        = 0x0010,
 789         NETIF_MSG_IFUP          = 0x0020,
 790         NETIF_MSG_RX_ERR        = 0x0040,
 791         NETIF_MSG_TX_ERR        = 0x0080,
 792         NETIF_MSG_TX_QUEUED     = 0x0100,
 793         NETIF_MSG_INTR          = 0x0200,
 794         NETIF_MSG_TX_DONE       = 0x0400,
 795         NETIF_MSG_RX_STATUS     = 0x0800,
 796         NETIF_MSG_PKTDATA       = 0x1000,
 797         NETIF_MSG_HW            = 0x2000,
 798         NETIF_MSG_WOL           = 0x4000,
 799 };
 800
 801 #define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
 802 #define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
 803 #define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
 804 #define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
 805 #define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
 806 #define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
 807 #define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
 808 #define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
 809 #define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
 810 #define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
 811 #define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
 812 #define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
 813 #define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
 814 #define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
 815 #define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
 816
 817 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
 818 {
 819         /* use default */
 820         if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
 821                 return default_msg_enable_bits;
 822         if (debug_value == 0)   /* no output */
 823                 return 0;
 824         /* set low N bits */
 825         return (1 << debug_value) - 1;
 826 }
 827
 828 /* Test if receive needs to be scheduled */
 829 static inline int __netif_rx_schedule_prep(struct net_device *dev)
 830 {
 831         return !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state);
 832 }
 833
 834 /* Test if receive needs to be scheduled but only if up */
 835 static inline int netif_rx_schedule_prep(struct net_device *dev)
 836 {
 837         return netif_running(dev) && __netif_rx_schedule_prep(dev);
 838 }
 839
 840 /* Add interface to tail of rx poll list. This assumes that _prep has
 841  * already been called and returned 1.
 842  */
 843
 844 extern void __netif_rx_schedule(struct net_device *dev);
 845
 846 /* Try to reschedule poll. Called by irq handler. */
 847
 848 static inline void netif_rx_schedule(struct net_device *dev)
 849 {
 850         if (netif_rx_schedule_prep(dev))
 851                 __netif_rx_schedule(dev);
 852 }
 853
 854 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().
 855  * Do not inline this?
 856  */
 857 static inline int netif_rx_reschedule(struct net_device *dev, int undo)
 858 {
 859         if (netif_rx_schedule_prep(dev)) {
 860                 unsigned long flags;
 861
 862                 dev->quota += undo;
 863
 864                 local_irq_save(flags);
 865                 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
 866                 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
 867                 local_irq_restore(flags);
 868                 return 1;
 869         }
 870         return 0;
 871 }
 872
 873 /* Remove interface from poll list: it must be in the poll list
 874  * on current cpu. This primitive is called by dev->poll(), when
 875  * it completes the work. The device cannot be out of poll list at this
 876  * moment, it is BUG().
 877  */
 878 static inline void netif_rx_complete(struct net_device *dev)
 879 {
 880         unsigned long flags;
 881
 882         local_irq_save(flags);
 883         BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
 884         list_del(&dev->poll_list);
 885         smp_mb__before_clear_bit();
 886         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 887         local_irq_restore(flags);
 888 }
 889
 890 static inline void netif_poll_disable(struct net_device *dev)
 891 {
 892         while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state))
 893                 /* No hurry. */
 894                 schedule_timeout_interruptible(1);
 895 }
 896
 897 static inline void netif_poll_enable(struct net_device *dev)
 898 {
 899         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 900 }
 901
 902 /* same as netif_rx_complete, except that local_irq_save(flags)
 903  * has already been issued
 904  */
 905 static inline void __netif_rx_complete(struct net_device *dev)
 906 {
 907         BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
 908         list_del(&dev->poll_list);
 909         smp_mb__before_clear_bit();
 910         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 911 }
 912
 913 static inline void netif_tx_lock(struct net_device *dev)
 914 {
 915         spin_lock(&dev->_xmit_lock);
 916         dev->xmit_lock_owner = smp_processor_id();
 917 }
 918
 919 static inline void netif_tx_lock_bh(struct net_device *dev)
 920 {
 921         spin_lock_bh(&dev->_xmit_lock);
 922         dev->xmit_lock_owner = smp_processor_id();
 923 }
 924
 925 static inline int netif_tx_trylock(struct net_device *dev)
 926 {
 927         int ok = spin_trylock(&dev->_xmit_lock);
 928         if (likely(ok))
 929                 dev->xmit_lock_owner = smp_processor_id();
 930         return ok;
 931 }
 932
 933 static inline void netif_tx_unlock(struct net_device *dev)
 934 {
 935         dev->xmit_lock_owner = -1;
 936         spin_unlock(&dev->_xmit_lock);
 937 }
 938
 939 static inline void netif_tx_unlock_bh(struct net_device *dev)
 940 {
 941         dev->xmit_lock_owner = -1;
 942         spin_unlock_bh(&dev->_xmit_lock);
 943 }
 944
 945 static inline void netif_tx_disable(struct net_device *dev)
 946 {
 947         netif_tx_lock_bh(dev);
 948         netif_stop_queue(dev);
 949         netif_tx_unlock_bh(dev);
 950 }
 951
 952 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
 953
 954 extern void             ether_setup(struct net_device *dev);
 955
 956 /* Support for loadable net-drivers */
 957 extern struct net_device *alloc_netdev(int sizeof_priv, const char *name,
 958                                        void (*setup)(struct net_device *));
 959 extern int              register_netdev(struct net_device *dev);
 960 extern void             unregister_netdev(struct net_device *dev);
 961 /* Functions used for multicast support */
 962 extern void             dev_mc_upload(struct net_device *dev);
 963 extern int              dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
 964 extern int              dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
 965 extern void             dev_mc_discard(struct net_device *dev);
 966 extern void             dev_set_promiscuity(struct net_device *dev, int inc);
 967 extern void             dev_set_allmulti(struct net_device *dev, int inc);
 968 extern void             netdev_state_change(struct net_device *dev);
 969 extern void             netdev_features_change(struct net_device *dev);
 970 /* Load a device via the kmod */
 971 extern void             dev_load(const char *name);
 972 extern void             dev_mcast_init(void);
 973 extern int              netdev_max_backlog;
 974 extern int              weight_p;
 975 extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
 976 extern int skb_checksum_help(struct sk_buff *skb, int inward);
 977 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
 978 #ifdef CONFIG_BUG
 979 extern void netdev_rx_csum_fault(struct net_device *dev);
 980 #else
 981 static inline void netdev_rx_csum_fault(struct net_device *dev)
 982 {
 983 }
 984 #endif
 985 /* rx skb timestamps */
 986 extern void             net_enable_timestamp(void);
 987 extern void             net_disable_timestamp(void);
 988
 989 #ifdef CONFIG_PROC_FS
 990 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
 991 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
 992 extern void dev_seq_stop(struct seq_file *seq, void *v);
 993 #endif
 994
 995 extern void linkwatch_run_queue(void);
 996
 997 static inline int net_gso_ok(int features, int gso_type)
 998 {
 999         int feature = gso_type << NETIF_F_GSO_SHIFT;
1000         return (features & feature) == feature;
1001 }
1002
1003 static inline int skb_gso_ok(struct sk_buff *skb, int features)
1004 {
1005         return net_gso_ok(features, skb_shinfo(skb)->gso_type);
1006 }
1007
1008 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
1009 {
1010         return skb_is_gso(skb) &&
1011                (!skb_gso_ok(skb, dev->features) ||
1012                 unlikely(skb->ip_summed != CHECKSUM_HW));
1013 }
1014
1015 #endif /* __KERNEL__ */
1016
1017 #endif  /* _LINUX_DEV_H */