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 #include <linux/dmaengine.h>
  41
  42 struct divert_blk;
  43 struct vlan_group;
  44 struct ethtool_ops;
  45 struct netpoll_info;
  46                                         /* source back-compat hooks */
  47 #define SET_ETHTOOL_OPS(netdev,ops) \
  48         ( (netdev)->ethtool_ops = (ops) )
  49
  50 #define HAVE_ALLOC_NETDEV               /* feature macro: alloc_xxxdev
  51                                            functions are available. */
  52 #define HAVE_FREE_NETDEV                /* free_netdev() */
  53 #define HAVE_NETDEV_PRIV                /* netdev_priv() */
  54
  55 #define NET_XMIT_SUCCESS        0
  56 #define NET_XMIT_DROP           1       /* skb dropped                  */
  57 #define NET_XMIT_CN             2       /* congestion notification      */
  58 #define NET_XMIT_POLICED        3       /* skb is shot by police        */
  59 #define NET_XMIT_BYPASS         4       /* packet does not leave via dequeue;
  60                                            (TC use only - dev_queue_xmit
  61                                            returns this as NET_XMIT_SUCCESS) */
  62
  63 /* Backlog congestion levels */
  64 #define NET_RX_SUCCESS          0   /* keep 'em coming, baby */
  65 #define NET_RX_DROP             1  /* packet dropped */
  66 #define NET_RX_CN_LOW           2   /* storm alert, just in case */
  67 #define NET_RX_CN_MOD           3   /* Storm on its way! */
  68 #define NET_RX_CN_HIGH          4   /* The storm is here */
  69 #define NET_RX_BAD              5  /* packet dropped due to kernel error */
  70
  71 #define net_xmit_errno(e)       ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
  72
  73 #endif
  74
  75 #define MAX_ADDR_LEN    32              /* Largest hardware address length */
  76
  77 /* Driver transmit return codes */
  78 #define NETDEV_TX_OK 0          /* driver took care of packet */
  79 #define NETDEV_TX_BUSY 1        /* driver tx path was busy*/
  80 #define NETDEV_TX_LOCKED -1     /* driver tx lock was already taken */
  81
  82 /*
  83  *      Compute the worst case header length according to the protocols
  84  *      used.
  85  */
  86
  87 #if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR)
  88 #define LL_MAX_HEADER   32
  89 #else
  90 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
  91 #define LL_MAX_HEADER   96
  92 #else
  93 #define LL_MAX_HEADER   48
  94 #endif
  95 #endif
  96
  97 #if !defined(CONFIG_NET_IPIP) && \
  98     !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE)
  99 #define MAX_HEADER LL_MAX_HEADER
 100 #else
 101 #define MAX_HEADER (LL_MAX_HEADER + 48)
 102 #endif
 103
 104 /*
 105  *      Network device statistics. Akin to the 2.0 ether stats but
 106  *      with byte counters.
 107  */
 108
 109 struct net_device_stats
 110 {
 111         unsigned long   rx_packets;             /* total packets received       */
 112         unsigned long   tx_packets;             /* total packets transmitted    */
 113         unsigned long   rx_bytes;               /* total bytes received         */
 114         unsigned long   tx_bytes;               /* total bytes transmitted      */
 115         unsigned long   rx_errors;              /* bad packets received         */
 116         unsigned long   tx_errors;              /* packet transmit problems     */
 117         unsigned long   rx_dropped;             /* no space in linux buffers    */
 118         unsigned long   tx_dropped;             /* no space available in linux  */
 119         unsigned long   multicast;              /* multicast packets received   */
 120         unsigned long   collisions;
 121
 122         /* detailed rx_errors: */
 123         unsigned long   rx_length_errors;
 124         unsigned long   rx_over_errors;         /* receiver ring buff overflow  */
 125         unsigned long   rx_crc_errors;          /* recved pkt with crc error    */
 126         unsigned long   rx_frame_errors;        /* recv'd frame alignment error */
 127         unsigned long   rx_fifo_errors;         /* recv'r fifo overrun          */
 128         unsigned long   rx_missed_errors;       /* receiver missed packet       */
 129
 130         /* detailed tx_errors */
 131         unsigned long   tx_aborted_errors;
 132         unsigned long   tx_carrier_errors;
 133         unsigned long   tx_fifo_errors;
 134         unsigned long   tx_heartbeat_errors;
 135         unsigned long   tx_window_errors;
 136
 137         /* for cslip etc */
 138         unsigned long   rx_compressed;
 139         unsigned long   tx_compressed;
 140 };
 141
 142
 143 /* Media selection options. */
 144 enum {
 145         IF_PORT_UNKNOWN = 0,
 146         IF_PORT_10BASE2,
 147         IF_PORT_10BASET,
 148         IF_PORT_AUI,
 149         IF_PORT_100BASET,
 150         IF_PORT_100BASETX,
 151         IF_PORT_100BASEFX
 152 };
 153
 154 #ifdef __KERNEL__
 155
 156 #include <linux/cache.h>
 157 #include <linux/skbuff.h>
 158
 159 struct neighbour;
 160 struct neigh_parms;
 161 struct sk_buff;
 162
 163 struct netif_rx_stats
 164 {
 165         unsigned total;
 166         unsigned dropped;
 167         unsigned time_squeeze;
 168         unsigned cpu_collision;
 169 };
 170
 171 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
 172
 173
 174 /*
 175  *      We tag multicasts with these structures.
 176  */
 177
 178 struct dev_mc_list
 179 {
 180         struct dev_mc_list      *next;
 181         __u8                    dmi_addr[MAX_ADDR_LEN];
 182         unsigned char           dmi_addrlen;
 183         int                     dmi_users;
 184         int                     dmi_gusers;
 185 };
 186
 187 struct hh_cache
 188 {
 189         struct hh_cache *hh_next;       /* Next entry                        */
 190         atomic_t        hh_refcnt;      /* number of users                   */
 191         unsigned short  hh_type;        /* protocol identifier, f.e ETH_P_IP
 192                                          *  NOTE:  For VLANs, this will be the
 193                                          *  encapuslated type. --BLG
 194                                          */
 195         int             hh_len;         /* length of header */
 196         int             (*hh_output)(struct sk_buff *skb);
 197         rwlock_t        hh_lock;
 198
 199         /* cached hardware header; allow for machine alignment needs.        */
 200 #define HH_DATA_MOD     16
 201 #define HH_DATA_OFF(__len) \
 202         (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
 203 #define HH_DATA_ALIGN(__len) \
 204         (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
 205         unsigned long   hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
 206 };
 207
 208 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
 209  * Alternative is:
 210  *   dev->hard_header_len ? (dev->hard_header_len +
 211  *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
 212  *
 213  * We could use other alignment values, but we must maintain the
 214  * relationship HH alignment <= LL alignment.
 215  */
 216 #define LL_RESERVED_SPACE(dev) \
 217         (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 218 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
 219         ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 220
 221 /* These flag bits are private to the generic network queueing
 222  * layer, they may not be explicitly referenced by any other
 223  * code.
 224  */
 225
 226 enum netdev_state_t
 227 {
 228         __LINK_STATE_XOFF=0,
 229         __LINK_STATE_START,
 230         __LINK_STATE_PRESENT,
 231         __LINK_STATE_SCHED,
 232         __LINK_STATE_NOCARRIER,
 233         __LINK_STATE_RX_SCHED,
 234         __LINK_STATE_LINKWATCH_PENDING,
 235         __LINK_STATE_DORMANT,
 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_TSO             2048    /* Can offload TCP/IP segmentation */
 312 #define NETIF_F_LLTX            4096    /* LockLess TX */
 313 #define NETIF_F_UFO             8192    /* Can offload UDP Large Send*/
 314
 315         struct net_device       *next_sched;
 316
 317         /* Interface index. Unique device identifier    */
 318         int                     ifindex;
 319         int                     iflink;
 320
 321
 322         struct net_device_stats* (*get_stats)(struct net_device *dev);
 323         struct iw_statistics*   (*get_wireless_stats)(struct net_device *dev);
 324
 325         /* List of functions to handle Wireless Extensions (instead of ioctl).
 326          * See <net/iw_handler.h> for details. Jean II */
 327         const struct iw_handler_def *   wireless_handlers;
 328         /* Instance data managed by the core of Wireless Extensions. */
 329         struct iw_public_data * wireless_data;
 330
 331         struct ethtool_ops *ethtool_ops;
 332
 333         /*
 334          * This marks the end of the "visible" part of the structure. All
 335          * fields hereafter are internal to the system, and may change at
 336          * will (read: may be cleaned up at will).
 337          */
 338
 339
 340         unsigned int            flags;  /* interface flags (a la BSD)   */
 341         unsigned short          gflags;
 342         unsigned short          priv_flags; /* Like 'flags' but invisible to userspace. */
 343         unsigned short          padded; /* How much padding added by alloc_netdev() */
 344
 345         unsigned char           operstate; /* RFC2863 operstate */
 346         unsigned char           link_mode; /* mapping policy to operstate */
 347
 348         unsigned                mtu;    /* interface MTU value          */
 349         unsigned short          type;   /* interface hardware type      */
 350         unsigned short          hard_header_len;        /* hardware hdr length  */
 351
 352         struct net_device       *master; /* Pointer to master device of a group,
 353                                           * which this device is member of.
 354                                           */
 355
 356         /* Interface address info. */
 357         unsigned char           perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
 358         unsigned char           addr_len;       /* hardware address length      */
 359         unsigned short          dev_id;         /* for shared network cards */
 360
 361         struct dev_mc_list      *mc_list;       /* Multicast mac addresses      */
 362         int                     mc_count;       /* Number of installed mcasts   */
 363         int                     promiscuity;
 364         int                     allmulti;
 365
 366
 367         /* Protocol specific pointers */
 368
 369         void                    *atalk_ptr;     /* AppleTalk link       */
 370         void                    *ip_ptr;        /* IPv4 specific data   */
 371         void                    *dn_ptr;        /* DECnet specific data */
 372         void                    *ip6_ptr;       /* IPv6 specific data */
 373         void                    *ec_ptr;        /* Econet specific data */
 374         void                    *ax25_ptr;      /* AX.25 specific data */
 375
 376 /*
 377  * Cache line mostly used on receive path (including eth_type_trans())
 378  */
 379         struct list_head        poll_list ____cacheline_aligned_in_smp;
 380                                         /* Link to poll list    */
 381
 382         int                     (*poll) (struct net_device *dev, int *quota);
 383         int                     quota;
 384         int                     weight;
 385         unsigned long           last_rx;        /* Time of last Rx      */
 386         /* Interface address info used in eth_type_trans() */
 387         unsigned char           dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast
 388                                                         because most packets are unicast) */
 389
 390         unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
 391
 392 /*
 393  * Cache line mostly used on queue transmit path (qdisc)
 394  */
 395         /* device queue lock */
 396         spinlock_t              queue_lock ____cacheline_aligned_in_smp;
 397         struct Qdisc            *qdisc;
 398         struct Qdisc            *qdisc_sleeping;
 399         struct list_head        qdisc_list;
 400         unsigned long           tx_queue_len;   /* Max frames per queue allowed */
 401
 402         /* ingress path synchronizer */
 403         spinlock_t              ingress_lock;
 404         struct Qdisc            *qdisc_ingress;
 405
 406 /*
 407  * One part is mostly used on xmit path (device)
 408  */
 409         /* hard_start_xmit synchronizer */
 410         spinlock_t              xmit_lock ____cacheline_aligned_in_smp;
 411         /* cpu id of processor entered to hard_start_xmit or -1,
 412            if nobody entered there.
 413          */
 414         int                     xmit_lock_owner;
 415         void                    *priv;  /* pointer to private data      */
 416         int                     (*hard_start_xmit) (struct sk_buff *skb,
 417                                                     struct net_device *dev);
 418         /* These may be needed for future network-power-down code. */
 419         unsigned long           trans_start;    /* Time (in jiffies) of last Tx */
 420
 421         int                     watchdog_timeo; /* used by dev_watchdog() */
 422         struct timer_list       watchdog_timer;
 423
 424 /*
 425  * refcnt is a very hot point, so align it on SMP
 426  */
 427         /* Number of references to this device */
 428         atomic_t                refcnt ____cacheline_aligned_in_smp;
 429
 430         /* delayed register/unregister */
 431         struct list_head        todo_list;
 432         /* device index hash chain */
 433         struct hlist_node       index_hlist;
 434
 435         /* register/unregister state machine */
 436         enum { NETREG_UNINITIALIZED=0,
 437                NETREG_REGISTERED,       /* completed register_netdevice */
 438                NETREG_UNREGISTERING,    /* called unregister_netdevice */
 439                NETREG_UNREGISTERED,     /* completed unregister todo */
 440                NETREG_RELEASED,         /* called free_netdev */
 441         } reg_state;
 442
 443         /* Called after device is detached from network. */
 444         void                    (*uninit)(struct net_device *dev);
 445         /* Called after last user reference disappears. */
 446         void                    (*destructor)(struct net_device *dev);
 447
 448         /* Pointers to interface service routines.      */
 449         int                     (*open)(struct net_device *dev);
 450         int                     (*stop)(struct net_device *dev);
 451 #define HAVE_NETDEV_POLL
 452         int                     (*hard_header) (struct sk_buff *skb,
 453                                                 struct net_device *dev,
 454                                                 unsigned short type,
 455                                                 void *daddr,
 456                                                 void *saddr,
 457                                                 unsigned len);
 458         int                     (*rebuild_header)(struct sk_buff *skb);
 459 #define HAVE_MULTICAST
 460         void                    (*set_multicast_list)(struct net_device *dev);
 461 #define HAVE_SET_MAC_ADDR
 462         int                     (*set_mac_address)(struct net_device *dev,
 463                                                    void *addr);
 464 #define HAVE_PRIVATE_IOCTL
 465         int                     (*do_ioctl)(struct net_device *dev,
 466                                             struct ifreq *ifr, int cmd);
 467 #define HAVE_SET_CONFIG
 468         int                     (*set_config)(struct net_device *dev,
 469                                               struct ifmap *map);
 470 #define HAVE_HEADER_CACHE
 471         int                     (*hard_header_cache)(struct neighbour *neigh,
 472                                                      struct hh_cache *hh);
 473         void                    (*header_cache_update)(struct hh_cache *hh,
 474                                                        struct net_device *dev,
 475                                                        unsigned char *  haddr);
 476 #define HAVE_CHANGE_MTU
 477         int                     (*change_mtu)(struct net_device *dev, int new_mtu);
 478
 479 #define HAVE_TX_TIMEOUT
 480         void                    (*tx_timeout) (struct net_device *dev);
 481
 482         void                    (*vlan_rx_register)(struct net_device *dev,
 483                                                     struct vlan_group *grp);
 484         void                    (*vlan_rx_add_vid)(struct net_device *dev,
 485                                                    unsigned short vid);
 486         void                    (*vlan_rx_kill_vid)(struct net_device *dev,
 487                                                     unsigned short vid);
 488
 489         int                     (*hard_header_parse)(struct sk_buff *skb,
 490                                                      unsigned char *haddr);
 491         int                     (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
 492 #ifdef CONFIG_NETPOLL
 493         struct netpoll_info     *npinfo;
 494 #endif
 495 #ifdef CONFIG_NET_POLL_CONTROLLER
 496         void                    (*poll_controller)(struct net_device *dev);
 497 #endif
 498
 499         /* bridge stuff */
 500         struct net_bridge_port  *br_port;
 501
 502 #ifdef CONFIG_NET_DIVERT
 503         /* this will get initialized at each interface type init routine */
 504         struct divert_blk       *divert;
 505 #endif /* CONFIG_NET_DIVERT */
 506
 507         /* class/net/name entry */
 508         struct class_device     class_dev;
 509         /* space for optional statistics and wireless sysfs groups */
 510         struct attribute_group  *sysfs_groups[3];
 511 };
 512
 513 #define NETDEV_ALIGN            32
 514 #define NETDEV_ALIGN_CONST      (NETDEV_ALIGN - 1)
 515
 516 static inline void *netdev_priv(struct net_device *dev)
 517 {
 518         return (char *)dev + ((sizeof(struct net_device)
 519                                         + NETDEV_ALIGN_CONST)
 520                                 & ~NETDEV_ALIGN_CONST);
 521 }
 522
 523 #define SET_MODULE_OWNER(dev) do { } while (0)
 524 /* Set the sysfs physical device reference for the network logical device
 525  * if set prior to registration will cause a symlink during initialization.
 526  */
 527 #define SET_NETDEV_DEV(net, pdev)       ((net)->class_dev.dev = (pdev))
 528
 529 struct packet_type {
 530         __be16                  type;   /* This is really htons(ether_type). */
 531         struct net_device       *dev;   /* NULL is wildcarded here           */
 532         int                     (*func) (struct sk_buff *,
 533                                          struct net_device *,
 534                                          struct packet_type *,
 535                                          struct net_device *);
 536         void                    *af_packet_priv;
 537         struct list_head        list;
 538 };
 539
 540 #include <linux/interrupt.h>
 541 #include <linux/notifier.h>
 542
 543 extern struct net_device                loopback_dev;           /* The loopback */
 544 extern struct net_device                *dev_base;              /* All devices */
 545 extern rwlock_t                         dev_base_lock;          /* Device list lock */
 546
 547 extern int                      netdev_boot_setup_check(struct net_device *dev);
 548 extern unsigned long            netdev_boot_base(const char *prefix, int unit);
 549 extern struct net_device    *dev_getbyhwaddr(unsigned short type, char *hwaddr);
 550 extern struct net_device *dev_getfirstbyhwtype(unsigned short type);
 551 extern void             dev_add_pack(struct packet_type *pt);
 552 extern void             dev_remove_pack(struct packet_type *pt);
 553 extern void             __dev_remove_pack(struct packet_type *pt);
 554
 555 extern struct net_device        *dev_get_by_flags(unsigned short flags,
 556                                                   unsigned short mask);
 557 extern struct net_device        *dev_get_by_name(const char *name);
 558 extern struct net_device        *__dev_get_by_name(const char *name);
 559 extern int              dev_alloc_name(struct net_device *dev, const char *name);
 560 extern int              dev_open(struct net_device *dev);
 561 extern int              dev_close(struct net_device *dev);
 562 extern int              dev_queue_xmit(struct sk_buff *skb);
 563 extern int              register_netdevice(struct net_device *dev);
 564 extern int              unregister_netdevice(struct net_device *dev);
 565 extern void             free_netdev(struct net_device *dev);
 566 extern void             synchronize_net(void);
 567 extern int              register_netdevice_notifier(struct notifier_block *nb);
 568 extern int              unregister_netdevice_notifier(struct notifier_block *nb);
 569 extern int              call_netdevice_notifiers(unsigned long val, void *v);
 570 extern struct net_device        *dev_get_by_index(int ifindex);
 571 extern struct net_device        *__dev_get_by_index(int ifindex);
 572 extern int              dev_restart(struct net_device *dev);
 573 #ifdef CONFIG_NETPOLL_TRAP
 574 extern int              netpoll_trap(void);
 575 #endif
 576
 577 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
 578 extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
 579 static inline int unregister_gifconf(unsigned int family)
 580 {
 581         return register_gifconf(family, NULL);
 582 }
 583
 584 /*
 585  * Incoming packets are placed on per-cpu queues so that
 586  * no locking is needed.
 587  */
 588
 589 struct softnet_data
 590 {
 591         struct net_device       *output_queue;
 592         struct sk_buff_head     input_pkt_queue;
 593         struct list_head        poll_list;
 594         struct sk_buff          *completion_queue;
 595
 596         struct net_device       backlog_dev;    /* Sorry. 8) */
 597 #ifdef CONFIG_NET_DMA
 598         struct dma_chan         *net_dma;
 599 #endif
 600 };
 601
 602 DECLARE_PER_CPU(struct softnet_data,softnet_data);
 603
 604 #define HAVE_NETIF_QUEUE
 605
 606 extern void __netif_schedule(struct net_device *dev);
 607
 608 static inline void netif_schedule(struct net_device *dev)
 609 {
 610         if (!test_bit(__LINK_STATE_XOFF, &dev->state))
 611                 __netif_schedule(dev);
 612 }
 613
 614 static inline void netif_start_queue(struct net_device *dev)
 615 {
 616         clear_bit(__LINK_STATE_XOFF, &dev->state);
 617 }
 618
 619 static inline void netif_wake_queue(struct net_device *dev)
 620 {
 621 #ifdef CONFIG_NETPOLL_TRAP
 622         if (netpoll_trap())
 623                 return;
 624 #endif
 625         if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
 626                 __netif_schedule(dev);
 627 }
 628
 629 static inline void netif_stop_queue(struct net_device *dev)
 630 {
 631 #ifdef CONFIG_NETPOLL_TRAP
 632         if (netpoll_trap())
 633                 return;
 634 #endif
 635         set_bit(__LINK_STATE_XOFF, &dev->state);
 636 }
 637
 638 static inline int netif_queue_stopped(const struct net_device *dev)
 639 {
 640         return test_bit(__LINK_STATE_XOFF, &dev->state);
 641 }
 642
 643 static inline int netif_running(const struct net_device *dev)
 644 {
 645         return test_bit(__LINK_STATE_START, &dev->state);
 646 }
 647
 648
 649 /* Use this variant when it is known for sure that it
 650  * is executing from interrupt context.
 651  */
 652 static inline void dev_kfree_skb_irq(struct sk_buff *skb)
 653 {
 654         if (atomic_dec_and_test(&skb->users)) {
 655                 struct softnet_data *sd;
 656                 unsigned long flags;
 657
 658                 local_irq_save(flags);
 659                 sd = &__get_cpu_var(softnet_data);
 660                 skb->next = sd->completion_queue;
 661                 sd->completion_queue = skb;
 662                 raise_softirq_irqoff(NET_TX_SOFTIRQ);
 663                 local_irq_restore(flags);
 664         }
 665 }
 666
 667 /* Use this variant in places where it could be invoked
 668  * either from interrupt or non-interrupt context.
 669  */
 670 extern void dev_kfree_skb_any(struct sk_buff *skb);
 671
 672 #define HAVE_NETIF_RX 1
 673 extern int              netif_rx(struct sk_buff *skb);
 674 extern int              netif_rx_ni(struct sk_buff *skb);
 675 #define HAVE_NETIF_RECEIVE_SKB 1
 676 extern int              netif_receive_skb(struct sk_buff *skb);
 677 extern int              dev_valid_name(const char *name);
 678 extern int              dev_ioctl(unsigned int cmd, void __user *);
 679 extern int              dev_ethtool(struct ifreq *);
 680 extern unsigned         dev_get_flags(const struct net_device *);
 681 extern int              dev_change_flags(struct net_device *, unsigned);
 682 extern int              dev_change_name(struct net_device *, char *);
 683 extern int              dev_set_mtu(struct net_device *, int);
 684 extern int              dev_set_mac_address(struct net_device *,
 685                                             struct sockaddr *);
 686 extern void             dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev);
 687
 688 extern void             dev_init(void);
 689
 690 extern int              netdev_nit;
 691 extern int              netdev_budget;
 692
 693 /* Called by rtnetlink.c:rtnl_unlock() */
 694 extern void netdev_run_todo(void);
 695
 696 static inline void dev_put(struct net_device *dev)
 697 {
 698         atomic_dec(&dev->refcnt);
 699 }
 700
 701 static inline void dev_hold(struct net_device *dev)
 702 {
 703         atomic_inc(&dev->refcnt);
 704 }
 705
 706 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
 707  * and _off may be called from IRQ context, but it is caller
 708  * who is responsible for serialization of these calls.
 709  *
 710  * The name carrier is inappropriate, these functions should really be
 711  * called netif_lowerlayer_*() because they represent the state of any
 712  * kind of lower layer not just hardware media.
 713  */
 714
 715 extern void linkwatch_fire_event(struct net_device *dev);
 716
 717 static inline int netif_carrier_ok(const struct net_device *dev)
 718 {
 719         return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
 720 }
 721
 722 extern void __netdev_watchdog_up(struct net_device *dev);
 723
 724 extern void netif_carrier_on(struct net_device *dev);
 725
 726 extern void netif_carrier_off(struct net_device *dev);
 727
 728 static inline void netif_dormant_on(struct net_device *dev)
 729 {
 730         if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
 731                 linkwatch_fire_event(dev);
 732 }
 733
 734 static inline void netif_dormant_off(struct net_device *dev)
 735 {
 736         if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
 737                 linkwatch_fire_event(dev);
 738 }
 739
 740 static inline int netif_dormant(const struct net_device *dev)
 741 {
 742         return test_bit(__LINK_STATE_DORMANT, &dev->state);
 743 }
 744
 745
 746 static inline int netif_oper_up(const struct net_device *dev) {
 747         return (dev->operstate == IF_OPER_UP ||
 748                 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
 749 }
 750
 751 /* Hot-plugging. */
 752 static inline int netif_device_present(struct net_device *dev)
 753 {
 754         return test_bit(__LINK_STATE_PRESENT, &dev->state);
 755 }
 756
 757 extern void netif_device_detach(struct net_device *dev);
 758
 759 extern void netif_device_attach(struct net_device *dev);
 760
 761 /*
 762  * Network interface message level settings
 763  */
 764 #define HAVE_NETIF_MSG 1
 765
 766 enum {
 767         NETIF_MSG_DRV           = 0x0001,
 768         NETIF_MSG_PROBE         = 0x0002,
 769         NETIF_MSG_LINK          = 0x0004,
 770         NETIF_MSG_TIMER         = 0x0008,
 771         NETIF_MSG_IFDOWN        = 0x0010,
 772         NETIF_MSG_IFUP          = 0x0020,
 773         NETIF_MSG_RX_ERR        = 0x0040,
 774         NETIF_MSG_TX_ERR        = 0x0080,
 775         NETIF_MSG_TX_QUEUED     = 0x0100,
 776         NETIF_MSG_INTR          = 0x0200,
 777         NETIF_MSG_TX_DONE       = 0x0400,
 778         NETIF_MSG_RX_STATUS     = 0x0800,
 779         NETIF_MSG_PKTDATA       = 0x1000,
 780         NETIF_MSG_HW            = 0x2000,
 781         NETIF_MSG_WOL           = 0x4000,
 782 };
 783
 784 #define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
 785 #define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
 786 #define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
 787 #define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
 788 #define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
 789 #define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
 790 #define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
 791 #define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
 792 #define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
 793 #define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
 794 #define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
 795 #define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
 796 #define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
 797 #define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
 798 #define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
 799
 800 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
 801 {
 802         /* use default */
 803         if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
 804                 return default_msg_enable_bits;
 805         if (debug_value == 0)   /* no output */
 806                 return 0;
 807         /* set low N bits */
 808         return (1 << debug_value) - 1;
 809 }
 810
 811 /* Test if receive needs to be scheduled */
 812 static inline int __netif_rx_schedule_prep(struct net_device *dev)
 813 {
 814         return !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state);
 815 }
 816
 817 /* Test if receive needs to be scheduled but only if up */
 818 static inline int netif_rx_schedule_prep(struct net_device *dev)
 819 {
 820         return netif_running(dev) && __netif_rx_schedule_prep(dev);
 821 }
 822
 823 /* Add interface to tail of rx poll list. This assumes that _prep has
 824  * already been called and returned 1.
 825  */
 826
 827 extern void __netif_rx_schedule(struct net_device *dev);
 828
 829 /* Try to reschedule poll. Called by irq handler. */
 830
 831 static inline void netif_rx_schedule(struct net_device *dev)
 832 {
 833         if (netif_rx_schedule_prep(dev))
 834                 __netif_rx_schedule(dev);
 835 }
 836
 837 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().
 838  * Do not inline this?
 839  */
 840 static inline int netif_rx_reschedule(struct net_device *dev, int undo)
 841 {
 842         if (netif_rx_schedule_prep(dev)) {
 843                 unsigned long flags;
 844
 845                 dev->quota += undo;
 846
 847                 local_irq_save(flags);
 848                 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
 849                 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
 850                 local_irq_restore(flags);
 851                 return 1;
 852         }
 853         return 0;
 854 }
 855
 856 /* Remove interface from poll list: it must be in the poll list
 857  * on current cpu. This primitive is called by dev->poll(), when
 858  * it completes the work. The device cannot be out of poll list at this
 859  * moment, it is BUG().
 860  */
 861 static inline void netif_rx_complete(struct net_device *dev)
 862 {
 863         unsigned long flags;
 864
 865         local_irq_save(flags);
 866         BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
 867         list_del(&dev->poll_list);
 868         smp_mb__before_clear_bit();
 869         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 870         local_irq_restore(flags);
 871 }
 872
 873 static inline void netif_poll_disable(struct net_device *dev)
 874 {
 875         while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state))
 876                 /* No hurry. */
 877                 schedule_timeout_interruptible(1);
 878 }
 879
 880 static inline void netif_poll_enable(struct net_device *dev)
 881 {
 882         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 883 }
 884
 885 /* same as netif_rx_complete, except that local_irq_save(flags)
 886  * has already been issued
 887  */
 888 static inline void __netif_rx_complete(struct net_device *dev)
 889 {
 890         BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
 891         list_del(&dev->poll_list);
 892         smp_mb__before_clear_bit();
 893         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 894 }
 895
 896 static inline void netif_tx_disable(struct net_device *dev)
 897 {
 898         spin_lock_bh(&dev->xmit_lock);
 899         netif_stop_queue(dev);
 900         spin_unlock_bh(&dev->xmit_lock);
 901 }
 902
 903 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
 904
 905 extern void             ether_setup(struct net_device *dev);
 906
 907 /* Support for loadable net-drivers */
 908 extern struct net_device *alloc_netdev(int sizeof_priv, const char *name,
 909                                        void (*setup)(struct net_device *));
 910 extern int              register_netdev(struct net_device *dev);
 911 extern void             unregister_netdev(struct net_device *dev);
 912 /* Functions used for multicast support */
 913 extern void             dev_mc_upload(struct net_device *dev);
 914 extern int              dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
 915 extern int              dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
 916 extern void             dev_mc_discard(struct net_device *dev);
 917 extern void             dev_set_promiscuity(struct net_device *dev, int inc);
 918 extern void             dev_set_allmulti(struct net_device *dev, int inc);
 919 extern void             netdev_state_change(struct net_device *dev);
 920 extern void             netdev_features_change(struct net_device *dev);
 921 /* Load a device via the kmod */
 922 extern void             dev_load(const char *name);
 923 extern void             dev_mcast_init(void);
 924 extern int              netdev_max_backlog;
 925 extern int              weight_p;
 926 extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
 927 extern int skb_checksum_help(struct sk_buff *skb, int inward);
 928 #ifdef CONFIG_BUG
 929 extern void netdev_rx_csum_fault(struct net_device *dev);
 930 #else
 931 static inline void netdev_rx_csum_fault(struct net_device *dev)
 932 {
 933 }
 934 #endif
 935 /* rx skb timestamps */
 936 extern void             net_enable_timestamp(void);
 937 extern void             net_disable_timestamp(void);
 938
 939 #ifdef CONFIG_PROC_FS
 940 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
 941 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
 942 extern void dev_seq_stop(struct seq_file *seq, void *v);
 943 #endif
 944
 945 extern void linkwatch_run_queue(void);
 946
 947 #endif /* __KERNEL__ */
 948
 949 #endif  /* _LINUX_DEV_H */