include/linux/netdevice.h

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              Definitions for the Interfaces handler.
   7  *
   8  * Version:     @(#)dev.h       1.0.10  08/12/93
   9  *
  10  * Authors:     Ross Biro
  11  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12  *              Corey Minyard <wf-rch!minyard@relay.EU.net>
  13  *              Donald J. Becker, <becker@cesdis.gsfc.nasa.gov>
  14  *              Alan Cox, <Alan.Cox@linux.org>
  15  *              Bjorn Ekwall. <bj0rn@blox.se>
  16  *              Pekka Riikonen <priikone@poseidon.pspt.fi>
  17  *
  18  *              This program is free software; you can redistribute it and/or
  19  *              modify it under the terms of the GNU General Public License
  20  *              as published by the Free Software Foundation; either version
  21  *              2 of the License, or (at your option) any later version.
  22  *
  23  *              Moved to /usr/include/linux for NET3
  24  */
  25 #ifndef _LINUX_NETDEVICE_H
  26 #define _LINUX_NETDEVICE_H
  27
  28 #include <linux/if.h>
  29 #include <linux/if_ether.h>
  30 #include <linux/if_packet.h>
  31
  32 #ifdef __KERNEL__
  33 #include <asm/atomic.h>
  34 #include <asm/cache.h>
  35 #include <asm/byteorder.h>
  36
  37 #include <linux/config.h>
  38 #include <linux/device.h>
  39 #include <linux/percpu.h>
  40
  41 struct divert_blk;
  42 struct vlan_group;
  43 struct ethtool_ops;
  44 struct netpoll_info;
  45                                         /* source back-compat hooks */
  46 #define SET_ETHTOOL_OPS(netdev,ops) \
  47         ( (netdev)->ethtool_ops = (ops) )
  48
  49 #define HAVE_ALLOC_NETDEV               /* feature macro: alloc_xxxdev
  50                                            functions are available. */
  51 #define HAVE_FREE_NETDEV                /* free_netdev() */
  52 #define HAVE_NETDEV_PRIV                /* netdev_priv() */
  53
  54 #define NET_XMIT_SUCCESS        0
  55 #define NET_XMIT_DROP           1       /* skb dropped                  */
  56 #define NET_XMIT_CN             2       /* congestion notification      */
  57 #define NET_XMIT_POLICED        3       /* skb is shot by police        */
  58 #define NET_XMIT_BYPASS         4       /* packet does not leave via dequeue;
  59                                            (TC use only - dev_queue_xmit
  60                                            returns this as NET_XMIT_SUCCESS) */
  61
  62 /* Backlog congestion levels */
  63 #define NET_RX_SUCCESS          0   /* keep 'em coming, baby */
  64 #define NET_RX_DROP             1  /* packet dropped */
  65 #define NET_RX_CN_LOW           2   /* storm alert, just in case */
  66 #define NET_RX_CN_MOD           3   /* Storm on its way! */
  67 #define NET_RX_CN_HIGH          4   /* The storm is here */
  68 #define NET_RX_BAD              5  /* packet dropped due to kernel error */
  69
  70 #define net_xmit_errno(e)       ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
  71
  72 #endif
  73
  74 #define MAX_ADDR_LEN    32              /* Largest hardware address length */
  75
  76 /* Driver transmit return codes */
  77 #define NETDEV_TX_OK 0          /* driver took care of packet */
  78 #define NETDEV_TX_BUSY 1        /* driver tx path was busy*/
  79 #define NETDEV_TX_LOCKED -1     /* driver tx lock was already taken */
  80
  81 /*
  82  *      Compute the worst case header length according to the protocols
  83  *      used.
  84  */
  85
  86 #if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR)
  87 #define LL_MAX_HEADER   32
  88 #else
  89 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
  90 #define LL_MAX_HEADER   96
  91 #else
  92 #define LL_MAX_HEADER   48
  93 #endif
  94 #endif
  95
  96 #if !defined(CONFIG_NET_IPIP) && \
  97     !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE)
  98 #define MAX_HEADER LL_MAX_HEADER
  99 #else
 100 #define MAX_HEADER (LL_MAX_HEADER + 48)
 101 #endif
 102
 103 /*
 104  *      Network device statistics. Akin to the 2.0 ether stats but
 105  *      with byte counters.
 106  */
 107
 108 struct net_device_stats
 109 {
 110         unsigned long   rx_packets;             /* total packets received       */
 111         unsigned long   tx_packets;             /* total packets transmitted    */
 112         unsigned long   rx_bytes;               /* total bytes received         */
 113         unsigned long   tx_bytes;               /* total bytes transmitted      */
 114         unsigned long   rx_errors;              /* bad packets received         */
 115         unsigned long   tx_errors;              /* packet transmit problems     */
 116         unsigned long   rx_dropped;             /* no space in linux buffers    */
 117         unsigned long   tx_dropped;             /* no space available in linux  */
 118         unsigned long   multicast;              /* multicast packets received   */
 119         unsigned long   collisions;
 120
 121         /* detailed rx_errors: */
 122         unsigned long   rx_length_errors;
 123         unsigned long   rx_over_errors;         /* receiver ring buff overflow  */
 124         unsigned long   rx_crc_errors;          /* recved pkt with crc error    */
 125         unsigned long   rx_frame_errors;        /* recv'd frame alignment error */
 126         unsigned long   rx_fifo_errors;         /* recv'r fifo overrun          */
 127         unsigned long   rx_missed_errors;       /* receiver missed packet       */
 128
 129         /* detailed tx_errors */
 130         unsigned long   tx_aborted_errors;
 131         unsigned long   tx_carrier_errors;
 132         unsigned long   tx_fifo_errors;
 133         unsigned long   tx_heartbeat_errors;
 134         unsigned long   tx_window_errors;
 135
 136         /* for cslip etc */
 137         unsigned long   rx_compressed;
 138         unsigned long   tx_compressed;
 139 };
 140
 141
 142 /* Media selection options. */
 143 enum {
 144         IF_PORT_UNKNOWN = 0,
 145         IF_PORT_10BASE2,
 146         IF_PORT_10BASET,
 147         IF_PORT_AUI,
 148         IF_PORT_100BASET,
 149         IF_PORT_100BASETX,
 150         IF_PORT_100BASEFX
 151 };
 152
 153 #ifdef __KERNEL__
 154
 155 #include <linux/cache.h>
 156 #include <linux/skbuff.h>
 157
 158 struct neighbour;
 159 struct neigh_parms;
 160 struct sk_buff;
 161
 162 struct netif_rx_stats
 163 {
 164         unsigned total;
 165         unsigned dropped;
 166         unsigned time_squeeze;
 167         unsigned cpu_collision;
 168 };
 169
 170 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
 171
 172
 173 /*
 174  *      We tag multicasts with these structures.
 175  */
 176
 177 struct dev_mc_list
 178 {
 179         struct dev_mc_list      *next;
 180         __u8                    dmi_addr[MAX_ADDR_LEN];
 181         unsigned char           dmi_addrlen;
 182         int                     dmi_users;
 183         int                     dmi_gusers;
 184 };
 185
 186 struct hh_cache
 187 {
 188         struct hh_cache *hh_next;       /* Next entry                        */
 189         atomic_t        hh_refcnt;      /* number of users                   */
 190         unsigned short  hh_type;        /* protocol identifier, f.e ETH_P_IP
 191                                          *  NOTE:  For VLANs, this will be the
 192                                          *  encapuslated type. --BLG
 193                                          */
 194         int             hh_len;         /* length of header */
 195         int             (*hh_output)(struct sk_buff *skb);
 196         rwlock_t        hh_lock;
 197
 198         /* cached hardware header; allow for machine alignment needs.        */
 199 #define HH_DATA_MOD     16
 200 #define HH_DATA_OFF(__len) \
 201         (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
 202 #define HH_DATA_ALIGN(__len) \
 203         (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
 204         unsigned long   hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
 205 };
 206
 207 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
 208  * Alternative is:
 209  *   dev->hard_header_len ? (dev->hard_header_len +
 210  *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
 211  *
 212  * We could use other alignment values, but we must maintain the
 213  * relationship HH alignment <= LL alignment.
 214  */
 215 #define LL_RESERVED_SPACE(dev) \
 216         (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 217 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
 218         ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 219
 220 /* These flag bits are private to the generic network queueing
 221  * layer, they may not be explicitly referenced by any other
 222  * code.
 223  */
 224
 225 enum netdev_state_t
 226 {
 227         __LINK_STATE_XOFF=0,
 228         __LINK_STATE_START,
 229         __LINK_STATE_PRESENT,
 230         __LINK_STATE_SCHED,
 231         __LINK_STATE_NOCARRIER,
 232         __LINK_STATE_RX_SCHED,
 233         __LINK_STATE_LINKWATCH_PENDING
 234 };
 235
 236
 237 /*
 238  * This structure holds at boot time configured netdevice settings. They
 239  * are then used in the device probing.
 240  */
 241 struct netdev_boot_setup {
 242         char name[IFNAMSIZ];
 243         struct ifmap map;
 244 };
 245 #define NETDEV_BOOT_SETUP_MAX 8
 246
 247 extern int __init netdev_boot_setup(char *str);
 248
 249 /*
 250  *      The DEVICE structure.
 251  *      Actually, this whole structure is a big mistake.  It mixes I/O
 252  *      data with strictly "high-level" data, and it has to know about
 253  *      almost every data structure used in the INET module.
 254  *
 255  *      FIXME: cleanup struct net_device such that network protocol info
 256  *      moves out.
 257  */
 258
 259 struct net_device
 260 {
 261
 262         /*
 263          * This is the first field of the "visible" part of this structure
 264          * (i.e. as seen by users in the "Space.c" file).  It is the name
 265          * the interface.
 266          */
 267         char                    name[IFNAMSIZ];
 268
 269         /*
 270          *      I/O specific fields
 271          *      FIXME: Merge these and struct ifmap into one
 272          */
 273         unsigned long           mem_end;        /* shared mem end       */
 274         unsigned long           mem_start;      /* shared mem start     */
 275         unsigned long           base_addr;      /* device I/O address   */
 276         unsigned int            irq;            /* device IRQ number    */
 277
 278         /*
 279          *      Some hardware also needs these fields, but they are not
 280          *      part of the usual set specified in Space.c.
 281          */
 282
 283         unsigned char           if_port;        /* Selectable AUI, TP,..*/
 284         unsigned char           dma;            /* DMA channel          */
 285
 286         unsigned long           state;
 287
 288         struct net_device       *next;
 289
 290         /* The device initialization function. Called only once. */
 291         int                     (*init)(struct net_device *dev);
 292
 293         /* ------- Fields preinitialized in Space.c finish here ------- */
 294
 295         struct net_device       *next_sched;
 296
 297         /* Interface index. Unique device identifier    */
 298         int                     ifindex;
 299         int                     iflink;
 300
 301
 302         struct net_device_stats* (*get_stats)(struct net_device *dev);
 303         struct iw_statistics*   (*get_wireless_stats)(struct net_device *dev);
 304
 305         /* List of functions to handle Wireless Extensions (instead of ioctl).
 306          * See <net/iw_handler.h> for details. Jean II */
 307         const struct iw_handler_def *   wireless_handlers;
 308         /* Instance data managed by the core of Wireless Extensions. */
 309         struct iw_public_data * wireless_data;
 310
 311         struct ethtool_ops *ethtool_ops;
 312
 313         /*
 314          * This marks the end of the "visible" part of the structure. All
 315          * fields hereafter are internal to the system, and may change at
 316          * will (read: may be cleaned up at will).
 317          */
 318
 319         /* These may be needed for future network-power-down code. */
 320         unsigned long           trans_start;    /* Time (in jiffies) of last Tx */
 321         unsigned long           last_rx;        /* Time of last Rx      */
 322
 323         unsigned short          flags;  /* interface flags (a la BSD)   */
 324         unsigned short          gflags;
 325         unsigned short          priv_flags; /* Like 'flags' but invisible to userspace. */
 326         unsigned short          padded; /* How much padding added by alloc_netdev() */
 327
 328         unsigned                mtu;    /* interface MTU value          */
 329         unsigned short          type;   /* interface hardware type      */
 330         unsigned short          hard_header_len;        /* hardware hdr length  */
 331         void                    *priv;  /* pointer to private data      */
 332
 333         struct net_device       *master; /* Pointer to master device of a group,
 334                                           * which this device is member of.
 335                                           */
 336
 337         /* Interface address info. */
 338         unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
 339         unsigned char           dev_addr[MAX_ADDR_LEN]; /* hw address   */
 340         unsigned char           addr_len;       /* hardware address length      */
 341         unsigned short          dev_id;         /* for shared network cards */
 342
 343         struct dev_mc_list      *mc_list;       /* Multicast mac addresses      */
 344         int                     mc_count;       /* Number of installed mcasts   */
 345         int                     promiscuity;
 346         int                     allmulti;
 347
 348         int                     watchdog_timeo;
 349         struct timer_list       watchdog_timer;
 350
 351         /* Protocol specific pointers */
 352
 353         void                    *atalk_ptr;     /* AppleTalk link       */
 354         void                    *ip_ptr;        /* IPv4 specific data   */
 355         void                    *dn_ptr;        /* DECnet specific data */
 356         void                    *ip6_ptr;       /* IPv6 specific data */
 357         void                    *ec_ptr;        /* Econet specific data */
 358         void                    *ax25_ptr;      /* AX.25 specific data */
 359
 360         struct list_head        poll_list;      /* Link to poll list    */
 361         int                     quota;
 362         int                     weight;
 363
 364         struct Qdisc            *qdisc;
 365         struct Qdisc            *qdisc_sleeping;
 366         struct Qdisc            *qdisc_ingress;
 367         struct list_head        qdisc_list;
 368         unsigned long           tx_queue_len;   /* Max frames per queue allowed */
 369
 370         /* ingress path synchronizer */
 371         spinlock_t              ingress_lock;
 372         /* hard_start_xmit synchronizer */
 373         spinlock_t              xmit_lock;
 374         /* cpu id of processor entered to hard_start_xmit or -1,
 375            if nobody entered there.
 376          */
 377         int                     xmit_lock_owner;
 378         /* device queue lock */
 379         spinlock_t              queue_lock;
 380         /* Number of references to this device */
 381         atomic_t                refcnt;
 382         /* delayed register/unregister */
 383         struct list_head        todo_list;
 384         /* device name hash chain */
 385         struct hlist_node       name_hlist;
 386         /* device index hash chain */
 387         struct hlist_node       index_hlist;
 388
 389         /* register/unregister state machine */
 390         enum { NETREG_UNINITIALIZED=0,
 391                NETREG_REGISTERING,      /* called register_netdevice */
 392                NETREG_REGISTERED,       /* completed register todo */
 393                NETREG_UNREGISTERING,    /* called unregister_netdevice */
 394                NETREG_UNREGISTERED,     /* completed unregister todo */
 395                NETREG_RELEASED,         /* called free_netdev */
 396         } reg_state;
 397
 398         /* Net device features */
 399         unsigned long           features;
 400 #define NETIF_F_SG              1       /* Scatter/gather IO. */
 401 #define NETIF_F_IP_CSUM         2       /* Can checksum only TCP/UDP over IPv4. */
 402 #define NETIF_F_NO_CSUM         4       /* Does not require checksum. F.e. loopack. */
 403 #define NETIF_F_HW_CSUM         8       /* Can checksum all the packets. */
 404 #define NETIF_F_HIGHDMA         32      /* Can DMA to high memory. */
 405 #define NETIF_F_FRAGLIST        64      /* Scatter/gather IO. */
 406 #define NETIF_F_HW_VLAN_TX      128     /* Transmit VLAN hw acceleration */
 407 #define NETIF_F_HW_VLAN_RX      256     /* Receive VLAN hw acceleration */
 408 #define NETIF_F_HW_VLAN_FILTER  512     /* Receive filtering on VLAN */
 409 #define NETIF_F_VLAN_CHALLENGED 1024    /* Device cannot handle VLAN packets */
 410 #define NETIF_F_TSO             2048    /* Can offload TCP/IP segmentation */
 411 #define NETIF_F_LLTX            4096    /* LockLess TX */
 412
 413         /* Called after device is detached from network. */
 414         void                    (*uninit)(struct net_device *dev);
 415         /* Called after last user reference disappears. */
 416         void                    (*destructor)(struct net_device *dev);
 417
 418         /* Pointers to interface service routines.      */
 419         int                     (*open)(struct net_device *dev);
 420         int                     (*stop)(struct net_device *dev);
 421         int                     (*hard_start_xmit) (struct sk_buff *skb,
 422                                                     struct net_device *dev);
 423 #define HAVE_NETDEV_POLL
 424         int                     (*poll) (struct net_device *dev, int *quota);
 425         int                     (*hard_header) (struct sk_buff *skb,
 426                                                 struct net_device *dev,
 427                                                 unsigned short type,
 428                                                 void *daddr,
 429                                                 void *saddr,
 430                                                 unsigned len);
 431         int                     (*rebuild_header)(struct sk_buff *skb);
 432 #define HAVE_MULTICAST
 433         void                    (*set_multicast_list)(struct net_device *dev);
 434 #define HAVE_SET_MAC_ADDR
 435         int                     (*set_mac_address)(struct net_device *dev,
 436                                                    void *addr);
 437 #define HAVE_PRIVATE_IOCTL
 438         int                     (*do_ioctl)(struct net_device *dev,
 439                                             struct ifreq *ifr, int cmd);
 440 #define HAVE_SET_CONFIG
 441         int                     (*set_config)(struct net_device *dev,
 442                                               struct ifmap *map);
 443 #define HAVE_HEADER_CACHE
 444         int                     (*hard_header_cache)(struct neighbour *neigh,
 445                                                      struct hh_cache *hh);
 446         void                    (*header_cache_update)(struct hh_cache *hh,
 447                                                        struct net_device *dev,
 448                                                        unsigned char *  haddr);
 449 #define HAVE_CHANGE_MTU
 450         int                     (*change_mtu)(struct net_device *dev, int new_mtu);
 451
 452 #define HAVE_TX_TIMEOUT
 453         void                    (*tx_timeout) (struct net_device *dev);
 454
 455         void                    (*vlan_rx_register)(struct net_device *dev,
 456                                                     struct vlan_group *grp);
 457         void                    (*vlan_rx_add_vid)(struct net_device *dev,
 458                                                    unsigned short vid);
 459         void                    (*vlan_rx_kill_vid)(struct net_device *dev,
 460                                                     unsigned short vid);
 461
 462         int                     (*hard_header_parse)(struct sk_buff *skb,
 463                                                      unsigned char *haddr);
 464         int                     (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
 465 #ifdef CONFIG_NETPOLL
 466         struct netpoll_info     *npinfo;
 467 #endif
 468 #ifdef CONFIG_NET_POLL_CONTROLLER
 469         void                    (*poll_controller)(struct net_device *dev);
 470 #endif
 471
 472         /* bridge stuff */
 473         struct net_bridge_port  *br_port;
 474
 475 #ifdef CONFIG_NET_DIVERT
 476         /* this will get initialized at each interface type init routine */
 477         struct divert_blk       *divert;
 478 #endif /* CONFIG_NET_DIVERT */
 479
 480         /* class/net/name entry */
 481         struct class_device     class_dev;
 482 };
 483
 484 #define NETDEV_ALIGN            32
 485 #define NETDEV_ALIGN_CONST      (NETDEV_ALIGN - 1)
 486
 487 static inline void *netdev_priv(struct net_device *dev)
 488 {
 489         return (char *)dev + ((sizeof(struct net_device)
 490                                         + NETDEV_ALIGN_CONST)
 491                                 & ~NETDEV_ALIGN_CONST);
 492 }
 493
 494 #define SET_MODULE_OWNER(dev) do { } while (0)
 495 /* Set the sysfs physical device reference for the network logical device
 496  * if set prior to registration will cause a symlink during initialization.
 497  */
 498 #define SET_NETDEV_DEV(net, pdev)       ((net)->class_dev.dev = (pdev))
 499
 500 struct packet_type {
 501         __be16                  type;   /* This is really htons(ether_type). */
 502         struct net_device       *dev;   /* NULL is wildcarded here           */
 503         int                     (*func) (struct sk_buff *,
 504                                          struct net_device *,
 505                                          struct packet_type *,
 506                                          struct net_device *);
 507         void                    *af_packet_priv;
 508         struct list_head        list;
 509 };
 510
 511 #include <linux/interrupt.h>
 512 #include <linux/notifier.h>
 513
 514 extern struct net_device                loopback_dev;           /* The loopback */
 515 extern struct net_device                *dev_base;              /* All devices */
 516 extern rwlock_t                         dev_base_lock;          /* Device list lock */
 517
 518 extern int                      netdev_boot_setup_check(struct net_device *dev);
 519 extern unsigned long            netdev_boot_base(const char *prefix, int unit);
 520 extern struct net_device    *dev_getbyhwaddr(unsigned short type, char *hwaddr);
 521 extern struct net_device *dev_getfirstbyhwtype(unsigned short type);
 522 extern void             dev_add_pack(struct packet_type *pt);
 523 extern void             dev_remove_pack(struct packet_type *pt);
 524 extern void             __dev_remove_pack(struct packet_type *pt);
 525
 526 extern struct net_device        *dev_get_by_flags(unsigned short flags,
 527                                                   unsigned short mask);
 528 extern struct net_device        *dev_get_by_name(const char *name);
 529 extern struct net_device        *__dev_get_by_name(const char *name);
 530 extern int              dev_alloc_name(struct net_device *dev, const char *name);
 531 extern int              dev_open(struct net_device *dev);
 532 extern int              dev_close(struct net_device *dev);
 533 extern int              dev_queue_xmit(struct sk_buff *skb);
 534 extern int              register_netdevice(struct net_device *dev);
 535 extern int              unregister_netdevice(struct net_device *dev);
 536 extern void             free_netdev(struct net_device *dev);
 537 extern void             synchronize_net(void);
 538 extern int              register_netdevice_notifier(struct notifier_block *nb);
 539 extern int              unregister_netdevice_notifier(struct notifier_block *nb);
 540 extern int              call_netdevice_notifiers(unsigned long val, void *v);
 541 extern struct net_device        *dev_get_by_index(int ifindex);
 542 extern struct net_device        *__dev_get_by_index(int ifindex);
 543 extern int              dev_restart(struct net_device *dev);
 544 #ifdef CONFIG_NETPOLL_TRAP
 545 extern int              netpoll_trap(void);
 546 #endif
 547
 548 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
 549 extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
 550 static inline int unregister_gifconf(unsigned int family)
 551 {
 552         return register_gifconf(family, NULL);
 553 }
 554
 555 /*
 556  * Incoming packets are placed on per-cpu queues so that
 557  * no locking is needed.
 558  */
 559
 560 struct softnet_data
 561 {
 562         struct net_device       *output_queue;
 563         struct sk_buff_head     input_pkt_queue;
 564         struct list_head        poll_list;
 565         struct sk_buff          *completion_queue;
 566
 567         struct net_device       backlog_dev;    /* Sorry. 8) */
 568 };
 569
 570 DECLARE_PER_CPU(struct softnet_data,softnet_data);
 571
 572 #define HAVE_NETIF_QUEUE
 573
 574 static inline void __netif_schedule(struct net_device *dev)
 575 {
 576         if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
 577                 unsigned long flags;
 578                 struct softnet_data *sd;
 579
 580                 local_irq_save(flags);
 581                 sd = &__get_cpu_var(softnet_data);
 582                 dev->next_sched = sd->output_queue;
 583                 sd->output_queue = dev;
 584                 raise_softirq_irqoff(NET_TX_SOFTIRQ);
 585                 local_irq_restore(flags);
 586         }
 587 }
 588
 589 static inline void netif_schedule(struct net_device *dev)
 590 {
 591         if (!test_bit(__LINK_STATE_XOFF, &dev->state))
 592                 __netif_schedule(dev);
 593 }
 594
 595 static inline void netif_start_queue(struct net_device *dev)
 596 {
 597         clear_bit(__LINK_STATE_XOFF, &dev->state);
 598 }
 599
 600 static inline void netif_wake_queue(struct net_device *dev)
 601 {
 602 #ifdef CONFIG_NETPOLL_TRAP
 603         if (netpoll_trap())
 604                 return;
 605 #endif
 606         if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
 607                 __netif_schedule(dev);
 608 }
 609
 610 static inline void netif_stop_queue(struct net_device *dev)
 611 {
 612 #ifdef CONFIG_NETPOLL_TRAP
 613         if (netpoll_trap())
 614                 return;
 615 #endif
 616         set_bit(__LINK_STATE_XOFF, &dev->state);
 617 }
 618
 619 static inline int netif_queue_stopped(const struct net_device *dev)
 620 {
 621         return test_bit(__LINK_STATE_XOFF, &dev->state);
 622 }
 623
 624 static inline int netif_running(const struct net_device *dev)
 625 {
 626         return test_bit(__LINK_STATE_START, &dev->state);
 627 }
 628
 629
 630 /* Use this variant when it is known for sure that it
 631  * is executing from interrupt context.
 632  */
 633 static inline void dev_kfree_skb_irq(struct sk_buff *skb)
 634 {
 635         if (atomic_dec_and_test(&skb->users)) {
 636                 struct softnet_data *sd;
 637                 unsigned long flags;
 638
 639                 local_irq_save(flags);
 640                 sd = &__get_cpu_var(softnet_data);
 641                 skb->next = sd->completion_queue;
 642                 sd->completion_queue = skb;
 643                 raise_softirq_irqoff(NET_TX_SOFTIRQ);
 644                 local_irq_restore(flags);
 645         }
 646 }
 647
 648 /* Use this variant in places where it could be invoked
 649  * either from interrupt or non-interrupt context.
 650  */
 651 static inline void dev_kfree_skb_any(struct sk_buff *skb)
 652 {
 653         if (in_irq() || irqs_disabled())
 654                 dev_kfree_skb_irq(skb);
 655         else
 656                 dev_kfree_skb(skb);
 657 }
 658
 659 #define HAVE_NETIF_RX 1
 660 extern int              netif_rx(struct sk_buff *skb);
 661 extern int              netif_rx_ni(struct sk_buff *skb);
 662 #define HAVE_NETIF_RECEIVE_SKB 1
 663 extern int              netif_receive_skb(struct sk_buff *skb);
 664 extern int              dev_ioctl(unsigned int cmd, void __user *);
 665 extern int              dev_ethtool(struct ifreq *);
 666 extern unsigned         dev_get_flags(const struct net_device *);
 667 extern int              dev_change_flags(struct net_device *, unsigned);
 668 extern int              dev_change_name(struct net_device *, char *);
 669 extern int              dev_set_mtu(struct net_device *, int);
 670 extern int              dev_set_mac_address(struct net_device *,
 671                                             struct sockaddr *);
 672 extern void             dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev);
 673
 674 extern void             dev_init(void);
 675
 676 extern int              netdev_nit;
 677 extern int              netdev_budget;
 678
 679 /* Called by rtnetlink.c:rtnl_unlock() */
 680 extern void netdev_run_todo(void);
 681
 682 static inline void dev_put(struct net_device *dev)
 683 {
 684         atomic_dec(&dev->refcnt);
 685 }
 686
 687 #define __dev_put(dev) atomic_dec(&(dev)->refcnt)
 688 #define dev_hold(dev) atomic_inc(&(dev)->refcnt)
 689
 690 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
 691  * and _off may be called from IRQ context, but it is caller
 692  * who is responsible for serialization of these calls.
 693  */
 694
 695 extern void linkwatch_fire_event(struct net_device *dev);
 696
 697 static inline int netif_carrier_ok(const struct net_device *dev)
 698 {
 699         return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
 700 }
 701
 702 extern void __netdev_watchdog_up(struct net_device *dev);
 703
 704 extern void netif_carrier_on(struct net_device *dev);
 705
 706 extern void netif_carrier_off(struct net_device *dev);
 707
 708 /* Hot-plugging. */
 709 static inline int netif_device_present(struct net_device *dev)
 710 {
 711         return test_bit(__LINK_STATE_PRESENT, &dev->state);
 712 }
 713
 714 static inline void netif_device_detach(struct net_device *dev)
 715 {
 716         if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
 717             netif_running(dev)) {
 718                 netif_stop_queue(dev);
 719         }
 720 }
 721
 722 static inline void netif_device_attach(struct net_device *dev)
 723 {
 724         if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
 725             netif_running(dev)) {
 726                 netif_wake_queue(dev);
 727                 __netdev_watchdog_up(dev);
 728         }
 729 }
 730
 731 /*
 732  * Network interface message level settings
 733  */
 734 #define HAVE_NETIF_MSG 1
 735
 736 enum {
 737         NETIF_MSG_DRV           = 0x0001,
 738         NETIF_MSG_PROBE         = 0x0002,
 739         NETIF_MSG_LINK          = 0x0004,
 740         NETIF_MSG_TIMER         = 0x0008,
 741         NETIF_MSG_IFDOWN        = 0x0010,
 742         NETIF_MSG_IFUP          = 0x0020,
 743         NETIF_MSG_RX_ERR        = 0x0040,
 744         NETIF_MSG_TX_ERR        = 0x0080,
 745         NETIF_MSG_TX_QUEUED     = 0x0100,
 746         NETIF_MSG_INTR          = 0x0200,
 747         NETIF_MSG_TX_DONE       = 0x0400,
 748         NETIF_MSG_RX_STATUS     = 0x0800,
 749         NETIF_MSG_PKTDATA       = 0x1000,
 750         NETIF_MSG_HW            = 0x2000,
 751         NETIF_MSG_WOL           = 0x4000,
 752 };
 753
 754 #define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
 755 #define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
 756 #define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
 757 #define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
 758 #define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
 759 #define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
 760 #define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
 761 #define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
 762 #define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
 763 #define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
 764 #define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
 765 #define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
 766 #define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
 767 #define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
 768 #define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
 769
 770 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
 771 {
 772         /* use default */
 773         if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
 774                 return default_msg_enable_bits;
 775         if (debug_value == 0)   /* no output */
 776                 return 0;
 777         /* set low N bits */
 778         return (1 << debug_value) - 1;
 779 }
 780
 781 /* Schedule rx intr now? */
 782
 783 static inline int netif_rx_schedule_prep(struct net_device *dev)
 784 {
 785         return netif_running(dev) &&
 786                 !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state);
 787 }
 788
 789 /* Add interface to tail of rx poll list. This assumes that _prep has
 790  * already been called and returned 1.
 791  */
 792
 793 static inline void __netif_rx_schedule(struct net_device *dev)
 794 {
 795         unsigned long flags;
 796
 797         local_irq_save(flags);
 798         dev_hold(dev);
 799         list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
 800         if (dev->quota < 0)
 801                 dev->quota += dev->weight;
 802         else
 803                 dev->quota = dev->weight;
 804         __raise_softirq_irqoff(NET_RX_SOFTIRQ);
 805         local_irq_restore(flags);
 806 }
 807
 808 /* Try to reschedule poll. Called by irq handler. */
 809
 810 static inline void netif_rx_schedule(struct net_device *dev)
 811 {
 812         if (netif_rx_schedule_prep(dev))
 813                 __netif_rx_schedule(dev);
 814 }
 815
 816 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().
 817  * Do not inline this?
 818  */
 819 static inline int netif_rx_reschedule(struct net_device *dev, int undo)
 820 {
 821         if (netif_rx_schedule_prep(dev)) {
 822                 unsigned long flags;
 823
 824                 dev->quota += undo;
 825
 826                 local_irq_save(flags);
 827                 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
 828                 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
 829                 local_irq_restore(flags);
 830                 return 1;
 831         }
 832         return 0;
 833 }
 834
 835 /* Remove interface from poll list: it must be in the poll list
 836  * on current cpu. This primitive is called by dev->poll(), when
 837  * it completes the work. The device cannot be out of poll list at this
 838  * moment, it is BUG().
 839  */
 840 static inline void netif_rx_complete(struct net_device *dev)
 841 {
 842         unsigned long flags;
 843
 844         local_irq_save(flags);
 845         BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
 846         list_del(&dev->poll_list);
 847         smp_mb__before_clear_bit();
 848         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 849         local_irq_restore(flags);
 850 }
 851
 852 static inline void netif_poll_disable(struct net_device *dev)
 853 {
 854         while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
 855                 /* No hurry. */
 856                 current->state = TASK_INTERRUPTIBLE;
 857                 schedule_timeout(1);
 858         }
 859 }
 860
 861 static inline void netif_poll_enable(struct net_device *dev)
 862 {
 863         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 864 }
 865
 866 /* same as netif_rx_complete, except that local_irq_save(flags)
 867  * has already been issued
 868  */
 869 static inline void __netif_rx_complete(struct net_device *dev)
 870 {
 871         BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
 872         list_del(&dev->poll_list);
 873         smp_mb__before_clear_bit();
 874         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 875 }
 876
 877 static inline void netif_tx_disable(struct net_device *dev)
 878 {
 879         spin_lock_bh(&dev->xmit_lock);
 880         netif_stop_queue(dev);
 881         spin_unlock_bh(&dev->xmit_lock);
 882 }
 883
 884 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
 885
 886 extern void             ether_setup(struct net_device *dev);
 887
 888 /* Support for loadable net-drivers */
 889 extern struct net_device *alloc_netdev(int sizeof_priv, const char *name,
 890                                        void (*setup)(struct net_device *));
 891 extern int              register_netdev(struct net_device *dev);
 892 extern void             unregister_netdev(struct net_device *dev);
 893 /* Functions used for multicast support */
 894 extern void             dev_mc_upload(struct net_device *dev);
 895 extern int              dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
 896 extern int              dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
 897 extern void             dev_mc_discard(struct net_device *dev);
 898 extern void             dev_set_promiscuity(struct net_device *dev, int inc);
 899 extern void             dev_set_allmulti(struct net_device *dev, int inc);
 900 extern void             netdev_state_change(struct net_device *dev);
 901 extern void             netdev_features_change(struct net_device *dev);
 902 /* Load a device via the kmod */
 903 extern void             dev_load(const char *name);
 904 extern void             dev_mcast_init(void);
 905 extern int              netdev_max_backlog;
 906 extern int              weight_p;
 907 extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
 908 extern int skb_checksum_help(struct sk_buff *skb, int inward);
 909 /* rx skb timestamps */
 910 extern void             net_enable_timestamp(void);
 911 extern void             net_disable_timestamp(void);
 912
 913 #ifdef CONFIG_PROC_FS
 914 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
 915 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
 916 extern void dev_seq_stop(struct seq_file *seq, void *v);
 917 #endif
 918
 919 extern void linkwatch_run_queue(void);
 920
 921 #endif /* __KERNEL__ */
 922
 923 #endif  /* _LINUX_DEV_H */