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 <linux/timer.h>
  34 #include <linux/delay.h>
  35 #include <asm/atomic.h>
  36 #include <asm/cache.h>
  37 #include <asm/byteorder.h>
  38
  39 #include <linux/device.h>
  40 #include <linux/percpu.h>
  41 #include <linux/dmaengine.h>
  42 #include <linux/workqueue.h>
  43
  44 #include <net/net_namespace.h>
  45
  46 struct vlan_group;
  47 struct ethtool_ops;
  48 struct netpoll_info;
  49 /* 802.11 specific */
  50 struct wireless_dev;
  51                                         /* source back-compat hooks */
  52 #define SET_ETHTOOL_OPS(netdev,ops) \
  53         ( (netdev)->ethtool_ops = (ops) )
  54
  55 #define HAVE_ALLOC_NETDEV               /* feature macro: alloc_xxxdev
  56                                            functions are available. */
  57 #define HAVE_FREE_NETDEV                /* free_netdev() */
  58 #define HAVE_NETDEV_PRIV                /* netdev_priv() */
  59
  60 #define NET_XMIT_SUCCESS        0
  61 #define NET_XMIT_DROP           1       /* skb dropped                  */
  62 #define NET_XMIT_CN             2       /* congestion notification      */
  63 #define NET_XMIT_POLICED        3       /* skb is shot by police        */
  64 #define NET_XMIT_BYPASS         4       /* packet does not leave via dequeue;
  65                                            (TC use only - dev_queue_xmit
  66                                            returns this as NET_XMIT_SUCCESS) */
  67
  68 /* Backlog congestion levels */
  69 #define NET_RX_SUCCESS          0   /* keep 'em coming, baby */
  70 #define NET_RX_DROP             1  /* packet dropped */
  71 #define NET_RX_CN_LOW           2   /* storm alert, just in case */
  72 #define NET_RX_CN_MOD           3   /* Storm on its way! */
  73 #define NET_RX_CN_HIGH          4   /* The storm is here */
  74 #define NET_RX_BAD              5  /* packet dropped due to kernel error */
  75
  76 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
  77  * indicates that the device will soon be dropping packets, or already drops
  78  * some packets of the same priority; prompting us to send less aggressively. */
  79 #define net_xmit_eval(e)        ((e) == NET_XMIT_CN? 0 : (e))
  80 #define net_xmit_errno(e)       ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
  81
  82 #endif
  83
  84 #define MAX_ADDR_LEN    32              /* Largest hardware address length */
  85
  86 /* Driver transmit return codes */
  87 #define NETDEV_TX_OK 0          /* driver took care of packet */
  88 #define NETDEV_TX_BUSY 1        /* driver tx path was busy*/
  89 #define NETDEV_TX_LOCKED -1     /* driver tx lock was already taken */
  90
  91 /*
  92  *      Compute the worst case header length according to the protocols
  93  *      used.
  94  */
  95
  96 #if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR)
  97 #define LL_MAX_HEADER   32
  98 #else
  99 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
 100 #define LL_MAX_HEADER   96
 101 #else
 102 #define LL_MAX_HEADER   48
 103 #endif
 104 #endif
 105
 106 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \
 107     !defined(CONFIG_NET_IPGRE) &&  !defined(CONFIG_NET_IPGRE_MODULE) && \
 108     !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \
 109     !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE)
 110 #define MAX_HEADER LL_MAX_HEADER
 111 #else
 112 #define MAX_HEADER (LL_MAX_HEADER + 48)
 113 #endif
 114
 115 struct net_device_subqueue
 116 {
 117         /* Give a control state for each queue.  This struct may contain
 118          * per-queue locks in the future.
 119          */
 120         unsigned long   state;
 121 };
 122
 123 /*
 124  *      Network device statistics. Akin to the 2.0 ether stats but
 125  *      with byte counters.
 126  */
 127
 128 struct net_device_stats
 129 {
 130         unsigned long   rx_packets;             /* total packets received       */
 131         unsigned long   tx_packets;             /* total packets transmitted    */
 132         unsigned long   rx_bytes;               /* total bytes received         */
 133         unsigned long   tx_bytes;               /* total bytes transmitted      */
 134         unsigned long   rx_errors;              /* bad packets received         */
 135         unsigned long   tx_errors;              /* packet transmit problems     */
 136         unsigned long   rx_dropped;             /* no space in linux buffers    */
 137         unsigned long   tx_dropped;             /* no space available in linux  */
 138         unsigned long   multicast;              /* multicast packets received   */
 139         unsigned long   collisions;
 140
 141         /* detailed rx_errors: */
 142         unsigned long   rx_length_errors;
 143         unsigned long   rx_over_errors;         /* receiver ring buff overflow  */
 144         unsigned long   rx_crc_errors;          /* recved pkt with crc error    */
 145         unsigned long   rx_frame_errors;        /* recv'd frame alignment error */
 146         unsigned long   rx_fifo_errors;         /* recv'r fifo overrun          */
 147         unsigned long   rx_missed_errors;       /* receiver missed packet       */
 148
 149         /* detailed tx_errors */
 150         unsigned long   tx_aborted_errors;
 151         unsigned long   tx_carrier_errors;
 152         unsigned long   tx_fifo_errors;
 153         unsigned long   tx_heartbeat_errors;
 154         unsigned long   tx_window_errors;
 155
 156         /* for cslip etc */
 157         unsigned long   rx_compressed;
 158         unsigned long   tx_compressed;
 159 };
 160
 161
 162 /* Media selection options. */
 163 enum {
 164         IF_PORT_UNKNOWN = 0,
 165         IF_PORT_10BASE2,
 166         IF_PORT_10BASET,
 167         IF_PORT_AUI,
 168         IF_PORT_100BASET,
 169         IF_PORT_100BASETX,
 170         IF_PORT_100BASEFX
 171 };
 172
 173 #ifdef __KERNEL__
 174
 175 #include <linux/cache.h>
 176 #include <linux/skbuff.h>
 177
 178 struct neighbour;
 179 struct neigh_parms;
 180 struct sk_buff;
 181
 182 struct netif_rx_stats
 183 {
 184         unsigned total;
 185         unsigned dropped;
 186         unsigned time_squeeze;
 187         unsigned cpu_collision;
 188 };
 189
 190 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
 191
 192 struct dev_addr_list
 193 {
 194         struct dev_addr_list    *next;
 195         u8                      da_addr[MAX_ADDR_LEN];
 196         u8                      da_addrlen;
 197         u8                      da_synced;
 198         int                     da_users;
 199         int                     da_gusers;
 200 };
 201
 202 /*
 203  *      We tag multicasts with these structures.
 204  */
 205
 206 #define dev_mc_list     dev_addr_list
 207 #define dmi_addr        da_addr
 208 #define dmi_addrlen     da_addrlen
 209 #define dmi_users       da_users
 210 #define dmi_gusers      da_gusers
 211
 212 struct hh_cache
 213 {
 214         struct hh_cache *hh_next;       /* Next entry                        */
 215         atomic_t        hh_refcnt;      /* number of users                   */
 216 /*
 217  * We want hh_output, hh_len, hh_lock and hh_data be a in a separate
 218  * cache line on SMP.
 219  * They are mostly read, but hh_refcnt may be changed quite frequently,
 220  * incurring cache line ping pongs.
 221  */
 222         __be16          hh_type ____cacheline_aligned_in_smp;
 223                                         /* protocol identifier, f.e ETH_P_IP
 224                                          *  NOTE:  For VLANs, this will be the
 225                                          *  encapuslated type. --BLG
 226                                          */
 227         u16             hh_len;         /* length of header */
 228         int             (*hh_output)(struct sk_buff *skb);
 229         seqlock_t       hh_lock;
 230
 231         /* cached hardware header; allow for machine alignment needs.        */
 232 #define HH_DATA_MOD     16
 233 #define HH_DATA_OFF(__len) \
 234         (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
 235 #define HH_DATA_ALIGN(__len) \
 236         (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
 237         unsigned long   hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
 238 };
 239
 240 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
 241  * Alternative is:
 242  *   dev->hard_header_len ? (dev->hard_header_len +
 243  *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
 244  *
 245  * We could use other alignment values, but we must maintain the
 246  * relationship HH alignment <= LL alignment.
 247  */
 248 #define LL_RESERVED_SPACE(dev) \
 249         (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 250 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
 251         ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 252
 253 struct header_ops {
 254         int     (*create) (struct sk_buff *skb, struct net_device *dev,
 255                            unsigned short type, const void *daddr,
 256                            const void *saddr, unsigned len);
 257         int     (*parse)(const struct sk_buff *skb, unsigned char *haddr);
 258         int     (*rebuild)(struct sk_buff *skb);
 259 #define HAVE_HEADER_CACHE
 260         int     (*cache)(const struct neighbour *neigh, struct hh_cache *hh);
 261         void    (*cache_update)(struct hh_cache *hh,
 262                                 const struct net_device *dev,
 263                                 const unsigned char *haddr);
 264 };
 265
 266 /* These flag bits are private to the generic network queueing
 267  * layer, they may not be explicitly referenced by any other
 268  * code.
 269  */
 270
 271 enum netdev_state_t
 272 {
 273         __LINK_STATE_XOFF=0,
 274         __LINK_STATE_START,
 275         __LINK_STATE_PRESENT,
 276         __LINK_STATE_SCHED,
 277         __LINK_STATE_NOCARRIER,
 278         __LINK_STATE_LINKWATCH_PENDING,
 279         __LINK_STATE_DORMANT,
 280         __LINK_STATE_QDISC_RUNNING,
 281 };
 282
 283
 284 /*
 285  * This structure holds at boot time configured netdevice settings. They
 286  * are then used in the device probing.
 287  */
 288 struct netdev_boot_setup {
 289         char name[IFNAMSIZ];
 290         struct ifmap map;
 291 };
 292 #define NETDEV_BOOT_SETUP_MAX 8
 293
 294 extern int __init netdev_boot_setup(char *str);
 295
 296 /*
 297  * Structure for NAPI scheduling similar to tasklet but with weighting
 298  */
 299 struct napi_struct {
 300         /* The poll_list must only be managed by the entity which
 301          * changes the state of the NAPI_STATE_SCHED bit.  This means
 302          * whoever atomically sets that bit can add this napi_struct
 303          * to the per-cpu poll_list, and whoever clears that bit
 304          * can remove from the list right before clearing the bit.
 305          */
 306         struct list_head        poll_list;
 307
 308         unsigned long           state;
 309         int                     weight;
 310         int                     (*poll)(struct napi_struct *, int);
 311 #ifdef CONFIG_NETPOLL
 312         spinlock_t              poll_lock;
 313         int                     poll_owner;
 314         struct net_device       *dev;
 315         struct list_head        dev_list;
 316 #endif
 317 };
 318
 319 enum
 320 {
 321         NAPI_STATE_SCHED,       /* Poll is scheduled */
 322         NAPI_STATE_DISABLE,     /* Disable pending */
 323 };
 324
 325 extern void __napi_schedule(struct napi_struct *n);
 326
 327 static inline int napi_disable_pending(struct napi_struct *n)
 328 {
 329         return test_bit(NAPI_STATE_DISABLE, &n->state);
 330 }
 331
 332 /**
 333  *      napi_schedule_prep - check if napi can be scheduled
 334  *      @n: napi context
 335  *
 336  * Test if NAPI routine is already running, and if not mark
 337  * it as running.  This is used as a condition variable
 338  * insure only one NAPI poll instance runs.  We also make
 339  * sure there is no pending NAPI disable.
 340  */
 341 static inline int napi_schedule_prep(struct napi_struct *n)
 342 {
 343         return !napi_disable_pending(n) &&
 344                 !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
 345 }
 346
 347 /**
 348  *      napi_schedule - schedule NAPI poll
 349  *      @n: napi context
 350  *
 351  * Schedule NAPI poll routine to be called if it is not already
 352  * running.
 353  */
 354 static inline void napi_schedule(struct napi_struct *n)
 355 {
 356         if (napi_schedule_prep(n))
 357                 __napi_schedule(n);
 358 }
 359
 360 /* Try to reschedule poll. Called by dev->poll() after napi_complete().  */
 361 static inline int napi_reschedule(struct napi_struct *napi)
 362 {
 363         if (napi_schedule_prep(napi)) {
 364                 __napi_schedule(napi);
 365                 return 1;
 366         }
 367         return 0;
 368 }
 369
 370 /**
 371  *      napi_complete - NAPI processing complete
 372  *      @n: napi context
 373  *
 374  * Mark NAPI processing as complete.
 375  */
 376 static inline void __napi_complete(struct napi_struct *n)
 377 {
 378         BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
 379         list_del(&n->poll_list);
 380         smp_mb__before_clear_bit();
 381         clear_bit(NAPI_STATE_SCHED, &n->state);
 382 }
 383
 384 static inline void napi_complete(struct napi_struct *n)
 385 {
 386         local_irq_disable();
 387         __napi_complete(n);
 388         local_irq_enable();
 389 }
 390
 391 /**
 392  *      napi_disable - prevent NAPI from scheduling
 393  *      @n: napi context
 394  *
 395  * Stop NAPI from being scheduled on this context.
 396  * Waits till any outstanding processing completes.
 397  */
 398 static inline void napi_disable(struct napi_struct *n)
 399 {
 400         set_bit(NAPI_STATE_DISABLE, &n->state);
 401         while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
 402                 msleep(1);
 403         clear_bit(NAPI_STATE_DISABLE, &n->state);
 404 }
 405
 406 /**
 407  *      napi_enable - enable NAPI scheduling
 408  *      @n: napi context
 409  *
 410  * Resume NAPI from being scheduled on this context.
 411  * Must be paired with napi_disable.
 412  */
 413 static inline void napi_enable(struct napi_struct *n)
 414 {
 415         BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
 416         smp_mb__before_clear_bit();
 417         clear_bit(NAPI_STATE_SCHED, &n->state);
 418 }
 419
 420 #ifdef CONFIG_SMP
 421 /**
 422  *      napi_synchronize - wait until NAPI is not running
 423  *      @n: napi context
 424  *
 425  * Wait until NAPI is done being scheduled on this context.
 426  * Waits till any outstanding processing completes but
 427  * does not disable future activations.
 428  */
 429 static inline void napi_synchronize(const struct napi_struct *n)
 430 {
 431         while (test_bit(NAPI_STATE_SCHED, &n->state))
 432                 msleep(1);
 433 }
 434 #else
 435 # define napi_synchronize(n)    barrier()
 436 #endif
 437
 438 /*
 439  *      The DEVICE structure.
 440  *      Actually, this whole structure is a big mistake.  It mixes I/O
 441  *      data with strictly "high-level" data, and it has to know about
 442  *      almost every data structure used in the INET module.
 443  *
 444  *      FIXME: cleanup struct net_device such that network protocol info
 445  *      moves out.
 446  */
 447
 448 struct net_device
 449 {
 450
 451         /*
 452          * This is the first field of the "visible" part of this structure
 453          * (i.e. as seen by users in the "Space.c" file).  It is the name
 454          * the interface.
 455          */
 456         char                    name[IFNAMSIZ];
 457         /* device name hash chain */
 458         struct hlist_node       name_hlist;
 459
 460         /*
 461          *      I/O specific fields
 462          *      FIXME: Merge these and struct ifmap into one
 463          */
 464         unsigned long           mem_end;        /* shared mem end       */
 465         unsigned long           mem_start;      /* shared mem start     */
 466         unsigned long           base_addr;      /* device I/O address   */
 467         unsigned int            irq;            /* device IRQ number    */
 468
 469         /*
 470          *      Some hardware also needs these fields, but they are not
 471          *      part of the usual set specified in Space.c.
 472          */
 473
 474         unsigned char           if_port;        /* Selectable AUI, TP,..*/
 475         unsigned char           dma;            /* DMA channel          */
 476
 477         unsigned long           state;
 478
 479         struct list_head        dev_list;
 480 #ifdef CONFIG_NETPOLL
 481         struct list_head        napi_list;
 482 #endif
 483
 484         /* The device initialization function. Called only once. */
 485         int                     (*init)(struct net_device *dev);
 486
 487         /* ------- Fields preinitialized in Space.c finish here ------- */
 488
 489         /* Net device features */
 490         unsigned long           features;
 491 #define NETIF_F_SG              1       /* Scatter/gather IO. */
 492 #define NETIF_F_IP_CSUM         2       /* Can checksum TCP/UDP over IPv4. */
 493 #define NETIF_F_NO_CSUM         4       /* Does not require checksum. F.e. loopack. */
 494 #define NETIF_F_HW_CSUM         8       /* Can checksum all the packets. */
 495 #define NETIF_F_IPV6_CSUM       16      /* Can checksum TCP/UDP over IPV6 */
 496 #define NETIF_F_HIGHDMA         32      /* Can DMA to high memory. */
 497 #define NETIF_F_FRAGLIST        64      /* Scatter/gather IO. */
 498 #define NETIF_F_HW_VLAN_TX      128     /* Transmit VLAN hw acceleration */
 499 #define NETIF_F_HW_VLAN_RX      256     /* Receive VLAN hw acceleration */
 500 #define NETIF_F_HW_VLAN_FILTER  512     /* Receive filtering on VLAN */
 501 #define NETIF_F_VLAN_CHALLENGED 1024    /* Device cannot handle VLAN packets */
 502 #define NETIF_F_GSO             2048    /* Enable software GSO. */
 503 #define NETIF_F_LLTX            4096    /* LockLess TX - deprecated. Please */
 504                                         /* do not use LLTX in new drivers */
 505 #define NETIF_F_NETNS_LOCAL     8192    /* Does not change network namespaces */
 506 #define NETIF_F_MULTI_QUEUE     16384   /* Has multiple TX/RX queues */
 507 #define NETIF_F_LRO             32768   /* large receive offload */
 508
 509         /* Segmentation offload features */
 510 #define NETIF_F_GSO_SHIFT       16
 511 #define NETIF_F_GSO_MASK        0xffff0000
 512 #define NETIF_F_TSO             (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
 513 #define NETIF_F_UFO             (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
 514 #define NETIF_F_GSO_ROBUST      (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
 515 #define NETIF_F_TSO_ECN         (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
 516 #define NETIF_F_TSO6            (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
 517
 518         /* List of features with software fallbacks. */
 519 #define NETIF_F_GSO_SOFTWARE    (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
 520
 521
 522 #define NETIF_F_GEN_CSUM        (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
 523 #define NETIF_F_V4_CSUM         (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
 524 #define NETIF_F_V6_CSUM         (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
 525 #define NETIF_F_ALL_CSUM        (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
 526
 527         struct net_device       *next_sched;
 528
 529         /* Interface index. Unique device identifier    */
 530         int                     ifindex;
 531         int                     iflink;
 532
 533
 534         struct net_device_stats* (*get_stats)(struct net_device *dev);
 535         struct net_device_stats stats;
 536
 537 #ifdef CONFIG_WIRELESS_EXT
 538         /* List of functions to handle Wireless Extensions (instead of ioctl).
 539          * See <net/iw_handler.h> for details. Jean II */
 540         const struct iw_handler_def *   wireless_handlers;
 541         /* Instance data managed by the core of Wireless Extensions. */
 542         struct iw_public_data * wireless_data;
 543 #endif
 544         const struct ethtool_ops *ethtool_ops;
 545
 546         /* Hardware header description */
 547         const struct header_ops *header_ops;
 548
 549         /*
 550          * This marks the end of the "visible" part of the structure. All
 551          * fields hereafter are internal to the system, and may change at
 552          * will (read: may be cleaned up at will).
 553          */
 554
 555
 556         unsigned int            flags;  /* interface flags (a la BSD)   */
 557         unsigned short          gflags;
 558         unsigned short          priv_flags; /* Like 'flags' but invisible to userspace. */
 559         unsigned short          padded; /* How much padding added by alloc_netdev() */
 560
 561         unsigned char           operstate; /* RFC2863 operstate */
 562         unsigned char           link_mode; /* mapping policy to operstate */
 563
 564         unsigned                mtu;    /* interface MTU value          */
 565         unsigned short          type;   /* interface hardware type      */
 566         unsigned short          hard_header_len;        /* hardware hdr length  */
 567
 568         struct net_device       *master; /* Pointer to master device of a group,
 569                                           * which this device is member of.
 570                                           */
 571
 572         /* Interface address info. */
 573         unsigned char           perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
 574         unsigned char           addr_len;       /* hardware address length      */
 575         unsigned short          dev_id;         /* for shared network cards */
 576
 577         struct dev_addr_list    *uc_list;       /* Secondary unicast mac addresses */
 578         int                     uc_count;       /* Number of installed ucasts   */
 579         int                     uc_promisc;
 580         struct dev_addr_list    *mc_list;       /* Multicast mac addresses      */
 581         int                     mc_count;       /* Number of installed mcasts   */
 582         int                     promiscuity;
 583         int                     allmulti;
 584
 585
 586         /* Protocol specific pointers */
 587
 588         void                    *atalk_ptr;     /* AppleTalk link       */
 589         void                    *ip_ptr;        /* IPv4 specific data   */
 590         void                    *dn_ptr;        /* DECnet specific data */
 591         void                    *ip6_ptr;       /* IPv6 specific data */
 592         void                    *ec_ptr;        /* Econet specific data */
 593         void                    *ax25_ptr;      /* AX.25 specific data */
 594         struct wireless_dev     *ieee80211_ptr; /* IEEE 802.11 specific data,
 595                                                    assign before registering */
 596
 597 /*
 598  * Cache line mostly used on receive path (including eth_type_trans())
 599  */
 600         unsigned long           last_rx;        /* Time of last Rx      */
 601         /* Interface address info used in eth_type_trans() */
 602         unsigned char           dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast
 603                                                         because most packets are unicast) */
 604
 605         unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
 606
 607         /* ingress path synchronizer */
 608         spinlock_t              ingress_lock;
 609         struct Qdisc            *qdisc_ingress;
 610
 611 /*
 612  * Cache line mostly used on queue transmit path (qdisc)
 613  */
 614         /* device queue lock */
 615         spinlock_t              queue_lock ____cacheline_aligned_in_smp;
 616         struct Qdisc            *qdisc;
 617         struct Qdisc            *qdisc_sleeping;
 618         struct list_head        qdisc_list;
 619         unsigned long           tx_queue_len;   /* Max frames per queue allowed */
 620
 621         /* Partially transmitted GSO packet. */
 622         struct sk_buff          *gso_skb;
 623
 624 /*
 625  * One part is mostly used on xmit path (device)
 626  */
 627         /* hard_start_xmit synchronizer */
 628         spinlock_t              _xmit_lock ____cacheline_aligned_in_smp;
 629         /* cpu id of processor entered to hard_start_xmit or -1,
 630            if nobody entered there.
 631          */
 632         int                     xmit_lock_owner;
 633         void                    *priv;  /* pointer to private data      */
 634         int                     (*hard_start_xmit) (struct sk_buff *skb,
 635                                                     struct net_device *dev);
 636         /* These may be needed for future network-power-down code. */
 637         unsigned long           trans_start;    /* Time (in jiffies) of last Tx */
 638
 639         int                     watchdog_timeo; /* used by dev_watchdog() */
 640         struct timer_list       watchdog_timer;
 641
 642 /*
 643  * refcnt is a very hot point, so align it on SMP
 644  */
 645         /* Number of references to this device */
 646         atomic_t                refcnt ____cacheline_aligned_in_smp;
 647
 648         /* delayed register/unregister */
 649         struct list_head        todo_list;
 650         /* device index hash chain */
 651         struct hlist_node       index_hlist;
 652
 653         struct net_device       *link_watch_next;
 654
 655         /* register/unregister state machine */
 656         enum { NETREG_UNINITIALIZED=0,
 657                NETREG_REGISTERED,       /* completed register_netdevice */
 658                NETREG_UNREGISTERING,    /* called unregister_netdevice */
 659                NETREG_UNREGISTERED,     /* completed unregister todo */
 660                NETREG_RELEASED,         /* called free_netdev */
 661         } reg_state;
 662
 663         /* Called after device is detached from network. */
 664         void                    (*uninit)(struct net_device *dev);
 665         /* Called after last user reference disappears. */
 666         void                    (*destructor)(struct net_device *dev);
 667
 668         /* Pointers to interface service routines.      */
 669         int                     (*open)(struct net_device *dev);
 670         int                     (*stop)(struct net_device *dev);
 671 #define HAVE_NETDEV_POLL
 672 #define HAVE_CHANGE_RX_FLAGS
 673         void                    (*change_rx_flags)(struct net_device *dev,
 674                                                    int flags);
 675 #define HAVE_SET_RX_MODE
 676         void                    (*set_rx_mode)(struct net_device *dev);
 677 #define HAVE_MULTICAST
 678         void                    (*set_multicast_list)(struct net_device *dev);
 679 #define HAVE_SET_MAC_ADDR
 680         int                     (*set_mac_address)(struct net_device *dev,
 681                                                    void *addr);
 682 #define HAVE_VALIDATE_ADDR
 683         int                     (*validate_addr)(struct net_device *dev);
 684 #define HAVE_PRIVATE_IOCTL
 685         int                     (*do_ioctl)(struct net_device *dev,
 686                                             struct ifreq *ifr, int cmd);
 687 #define HAVE_SET_CONFIG
 688         int                     (*set_config)(struct net_device *dev,
 689                                               struct ifmap *map);
 690 #define HAVE_CHANGE_MTU
 691         int                     (*change_mtu)(struct net_device *dev, int new_mtu);
 692
 693 #define HAVE_TX_TIMEOUT
 694         void                    (*tx_timeout) (struct net_device *dev);
 695
 696         void                    (*vlan_rx_register)(struct net_device *dev,
 697                                                     struct vlan_group *grp);
 698         void                    (*vlan_rx_add_vid)(struct net_device *dev,
 699                                                    unsigned short vid);
 700         void                    (*vlan_rx_kill_vid)(struct net_device *dev,
 701                                                     unsigned short vid);
 702
 703         int                     (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
 704 #ifdef CONFIG_NETPOLL
 705         struct netpoll_info     *npinfo;
 706 #endif
 707 #ifdef CONFIG_NET_POLL_CONTROLLER
 708         void                    (*poll_controller)(struct net_device *dev);
 709 #endif
 710
 711         /* Network namespace this network device is inside */
 712         struct net              *nd_net;
 713
 714         /* bridge stuff */
 715         struct net_bridge_port  *br_port;
 716         /* macvlan */
 717         struct macvlan_port     *macvlan_port;
 718
 719         /* class/net/name entry */
 720         struct device           dev;
 721         /* space for optional statistics and wireless sysfs groups */
 722         struct attribute_group  *sysfs_groups[3];
 723
 724         /* rtnetlink link ops */
 725         const struct rtnl_link_ops *rtnl_link_ops;
 726
 727         /* The TX queue control structures */
 728         unsigned int                    egress_subqueue_count;
 729         struct net_device_subqueue      egress_subqueue[1];
 730 };
 731 #define to_net_dev(d) container_of(d, struct net_device, dev)
 732
 733 #define NETDEV_ALIGN            32
 734 #define NETDEV_ALIGN_CONST      (NETDEV_ALIGN - 1)
 735
 736 /**
 737  *      netdev_priv - access network device private data
 738  *      @dev: network device
 739  *
 740  * Get network device private data
 741  */
 742 static inline void *netdev_priv(const struct net_device *dev)
 743 {
 744         return dev->priv;
 745 }
 746
 747 /* Set the sysfs physical device reference for the network logical device
 748  * if set prior to registration will cause a symlink during initialization.
 749  */
 750 #define SET_NETDEV_DEV(net, pdev)       ((net)->dev.parent = (pdev))
 751
 752 /**
 753  *      netif_napi_add - initialize a napi context
 754  *      @dev:  network device
 755  *      @napi: napi context
 756  *      @poll: polling function
 757  *      @weight: default weight
 758  *
 759  * netif_napi_add() must be used to initialize a napi context prior to calling
 760  * *any* of the other napi related functions.
 761  */
 762 static inline void netif_napi_add(struct net_device *dev,
 763                                   struct napi_struct *napi,
 764                                   int (*poll)(struct napi_struct *, int),
 765                                   int weight)
 766 {
 767         INIT_LIST_HEAD(&napi->poll_list);
 768         napi->poll = poll;
 769         napi->weight = weight;
 770 #ifdef CONFIG_NETPOLL
 771         napi->dev = dev;
 772         list_add(&napi->dev_list, &dev->napi_list);
 773         spin_lock_init(&napi->poll_lock);
 774         napi->poll_owner = -1;
 775 #endif
 776         set_bit(NAPI_STATE_SCHED, &napi->state);
 777 }
 778
 779 struct packet_type {
 780         __be16                  type;   /* This is really htons(ether_type). */
 781         struct net_device       *dev;   /* NULL is wildcarded here           */
 782         int                     (*func) (struct sk_buff *,
 783                                          struct net_device *,
 784                                          struct packet_type *,
 785                                          struct net_device *);
 786         struct sk_buff          *(*gso_segment)(struct sk_buff *skb,
 787                                                 int features);
 788         int                     (*gso_send_check)(struct sk_buff *skb);
 789         void                    *af_packet_priv;
 790         struct list_head        list;
 791 };
 792
 793 #include <linux/interrupt.h>
 794 #include <linux/notifier.h>
 795
 796 extern rwlock_t                         dev_base_lock;          /* Device list lock */
 797
 798
 799 #define for_each_netdev(net, d)         \
 800                 list_for_each_entry(d, &(net)->dev_base_head, dev_list)
 801 #define for_each_netdev_safe(net, d, n) \
 802                 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
 803 #define for_each_netdev_continue(net, d)                \
 804                 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
 805 #define net_device_entry(lh)    list_entry(lh, struct net_device, dev_list)
 806
 807 static inline struct net_device *next_net_device(struct net_device *dev)
 808 {
 809         struct list_head *lh;
 810         struct net *net;
 811
 812         net = dev->nd_net;
 813         lh = dev->dev_list.next;
 814         return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
 815 }
 816
 817 static inline struct net_device *first_net_device(struct net *net)
 818 {
 819         return list_empty(&net->dev_base_head) ? NULL :
 820                 net_device_entry(net->dev_base_head.next);
 821 }
 822
 823 extern int                      netdev_boot_setup_check(struct net_device *dev);
 824 extern unsigned long            netdev_boot_base(const char *prefix, int unit);
 825 extern struct net_device    *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr);
 826 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
 827 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
 828 extern void             dev_add_pack(struct packet_type *pt);
 829 extern void             dev_remove_pack(struct packet_type *pt);
 830 extern void             __dev_remove_pack(struct packet_type *pt);
 831
 832 extern struct net_device        *dev_get_by_flags(struct net *net, unsigned short flags,
 833                                                   unsigned short mask);
 834 extern struct net_device        *dev_get_by_name(struct net *net, const char *name);
 835 extern struct net_device        *__dev_get_by_name(struct net *net, const char *name);
 836 extern int              dev_alloc_name(struct net_device *dev, const char *name);
 837 extern int              dev_open(struct net_device *dev);
 838 extern int              dev_close(struct net_device *dev);
 839 extern int              dev_queue_xmit(struct sk_buff *skb);
 840 extern int              register_netdevice(struct net_device *dev);
 841 extern void             unregister_netdevice(struct net_device *dev);
 842 extern void             free_netdev(struct net_device *dev);
 843 extern void             synchronize_net(void);
 844 extern int              register_netdevice_notifier(struct notifier_block *nb);
 845 extern int              unregister_netdevice_notifier(struct notifier_block *nb);
 846 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
 847 extern struct net_device        *dev_get_by_index(struct net *net, int ifindex);
 848 extern struct net_device        *__dev_get_by_index(struct net *net, int ifindex);
 849 extern int              dev_restart(struct net_device *dev);
 850 #ifdef CONFIG_NETPOLL_TRAP
 851 extern int              netpoll_trap(void);
 852 #endif
 853
 854 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 855                                   unsigned short type,
 856                                   const void *daddr, const void *saddr,
 857                                   unsigned len)
 858 {
 859         if (!dev->header_ops || !dev->header_ops->create)
 860                 return 0;
 861
 862         return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
 863 }
 864
 865 static inline int dev_parse_header(const struct sk_buff *skb,
 866                                    unsigned char *haddr)
 867 {
 868         const struct net_device *dev = skb->dev;
 869
 870         if (!dev->header_ops || !dev->header_ops->parse)
 871                 return 0;
 872         return dev->header_ops->parse(skb, haddr);
 873 }
 874
 875 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
 876 extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
 877 static inline int unregister_gifconf(unsigned int family)
 878 {
 879         return register_gifconf(family, NULL);
 880 }
 881
 882 /*
 883  * Incoming packets are placed on per-cpu queues so that
 884  * no locking is needed.
 885  */
 886 struct softnet_data
 887 {
 888         struct net_device       *output_queue;
 889         struct sk_buff_head     input_pkt_queue;
 890         struct list_head        poll_list;
 891         struct sk_buff          *completion_queue;
 892
 893         struct napi_struct      backlog;
 894 #ifdef CONFIG_NET_DMA
 895         struct dma_chan         *net_dma;
 896 #endif
 897 };
 898
 899 DECLARE_PER_CPU(struct softnet_data,softnet_data);
 900
 901 #define HAVE_NETIF_QUEUE
 902
 903 extern void __netif_schedule(struct net_device *dev);
 904
 905 static inline void netif_schedule(struct net_device *dev)
 906 {
 907         if (!test_bit(__LINK_STATE_XOFF, &dev->state))
 908                 __netif_schedule(dev);
 909 }
 910
 911 /**
 912  *      netif_start_queue - allow transmit
 913  *      @dev: network device
 914  *
 915  *      Allow upper layers to call the device hard_start_xmit routine.
 916  */
 917 static inline void netif_start_queue(struct net_device *dev)
 918 {
 919         clear_bit(__LINK_STATE_XOFF, &dev->state);
 920 }
 921
 922 /**
 923  *      netif_wake_queue - restart transmit
 924  *      @dev: network device
 925  *
 926  *      Allow upper layers to call the device hard_start_xmit routine.
 927  *      Used for flow control when transmit resources are available.
 928  */
 929 static inline void netif_wake_queue(struct net_device *dev)
 930 {
 931 #ifdef CONFIG_NETPOLL_TRAP
 932         if (netpoll_trap()) {
 933                 clear_bit(__LINK_STATE_XOFF, &dev->state);
 934                 return;
 935         }
 936 #endif
 937         if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
 938                 __netif_schedule(dev);
 939 }
 940
 941 /**
 942  *      netif_stop_queue - stop transmitted packets
 943  *      @dev: network device
 944  *
 945  *      Stop upper layers calling the device hard_start_xmit routine.
 946  *      Used for flow control when transmit resources are unavailable.
 947  */
 948 static inline void netif_stop_queue(struct net_device *dev)
 949 {
 950         set_bit(__LINK_STATE_XOFF, &dev->state);
 951 }
 952
 953 /**
 954  *      netif_queue_stopped - test if transmit queue is flowblocked
 955  *      @dev: network device
 956  *
 957  *      Test if transmit queue on device is currently unable to send.
 958  */
 959 static inline int netif_queue_stopped(const struct net_device *dev)
 960 {
 961         return test_bit(__LINK_STATE_XOFF, &dev->state);
 962 }
 963
 964 /**
 965  *      netif_running - test if up
 966  *      @dev: network device
 967  *
 968  *      Test if the device has been brought up.
 969  */
 970 static inline int netif_running(const struct net_device *dev)
 971 {
 972         return test_bit(__LINK_STATE_START, &dev->state);
 973 }
 974
 975 /*
 976  * Routines to manage the subqueues on a device.  We only need start
 977  * stop, and a check if it's stopped.  All other device management is
 978  * done at the overall netdevice level.
 979  * Also test the device if we're multiqueue.
 980  */
 981
 982 /**
 983  *      netif_start_subqueue - allow sending packets on subqueue
 984  *      @dev: network device
 985  *      @queue_index: sub queue index
 986  *
 987  * Start individual transmit queue of a device with multiple transmit queues.
 988  */
 989 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
 990 {
 991 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
 992         clear_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state);
 993 #endif
 994 }
 995
 996 /**
 997  *      netif_stop_subqueue - stop sending packets on subqueue
 998  *      @dev: network device
 999  *      @queue_index: sub queue index
1000  *
1001  * Stop individual transmit queue of a device with multiple transmit queues.
1002  */
1003 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
1004 {
1005 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
1006 #ifdef CONFIG_NETPOLL_TRAP
1007         if (netpoll_trap())
1008                 return;
1009 #endif
1010         set_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state);
1011 #endif
1012 }
1013
1014 /**
1015  *      netif_subqueue_stopped - test status of subqueue
1016  *      @dev: network device
1017  *      @queue_index: sub queue index
1018  *
1019  * Check individual transmit queue of a device with multiple transmit queues.
1020  */
1021 static inline int __netif_subqueue_stopped(const struct net_device *dev,
1022                                          u16 queue_index)
1023 {
1024 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
1025         return test_bit(__LINK_STATE_XOFF,
1026                         &dev->egress_subqueue[queue_index].state);
1027 #else
1028         return 0;
1029 #endif
1030 }
1031
1032 static inline int netif_subqueue_stopped(const struct net_device *dev,
1033                                          struct sk_buff *skb)
1034 {
1035         return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
1036 }
1037
1038 /**
1039  *      netif_wake_subqueue - allow sending packets on subqueue
1040  *      @dev: network device
1041  *      @queue_index: sub queue index
1042  *
1043  * Resume individual transmit queue of a device with multiple transmit queues.
1044  */
1045 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
1046 {
1047 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
1048 #ifdef CONFIG_NETPOLL_TRAP
1049         if (netpoll_trap())
1050                 return;
1051 #endif
1052         if (test_and_clear_bit(__LINK_STATE_XOFF,
1053                                &dev->egress_subqueue[queue_index].state))
1054                 __netif_schedule(dev);
1055 #endif
1056 }
1057
1058 /**
1059  *      netif_is_multiqueue - test if device has multiple transmit queues
1060  *      @dev: network device
1061  *
1062  * Check if device has multiple transmit queues
1063  * Always falls if NETDEVICE_MULTIQUEUE is not configured
1064  */
1065 static inline int netif_is_multiqueue(const struct net_device *dev)
1066 {
1067 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
1068         return (!!(NETIF_F_MULTI_QUEUE & dev->features));
1069 #else
1070         return 0;
1071 #endif
1072 }
1073
1074 /* Use this variant when it is known for sure that it
1075  * is executing from interrupt context.
1076  */
1077 extern void dev_kfree_skb_irq(struct sk_buff *skb);
1078
1079 /* Use this variant in places where it could be invoked
1080  * either from interrupt or non-interrupt context.
1081  */
1082 extern void dev_kfree_skb_any(struct sk_buff *skb);
1083
1084 #define HAVE_NETIF_RX 1
1085 extern int              netif_rx(struct sk_buff *skb);
1086 extern int              netif_rx_ni(struct sk_buff *skb);
1087 #define HAVE_NETIF_RECEIVE_SKB 1
1088 extern int              netif_receive_skb(struct sk_buff *skb);
1089 extern int              dev_valid_name(const char *name);
1090 extern int              dev_ioctl(struct net *net, unsigned int cmd, void __user *);
1091 extern int              dev_ethtool(struct net *net, struct ifreq *);
1092 extern unsigned         dev_get_flags(const struct net_device *);
1093 extern int              dev_change_flags(struct net_device *, unsigned);
1094 extern int              dev_change_name(struct net_device *, char *);
1095 extern int              dev_change_net_namespace(struct net_device *,
1096                                                  struct net *, const char *);
1097 extern int              dev_set_mtu(struct net_device *, int);
1098 extern int              dev_set_mac_address(struct net_device *,
1099                                             struct sockaddr *);
1100 extern int              dev_hard_start_xmit(struct sk_buff *skb,
1101                                             struct net_device *dev);
1102
1103 extern int              netdev_budget;
1104
1105 /* Called by rtnetlink.c:rtnl_unlock() */
1106 extern void netdev_run_todo(void);
1107
1108 /**
1109  *      dev_put - release reference to device
1110  *      @dev: network device
1111  *
1112  * Release reference to device to allow it to be freed.
1113  */
1114 static inline void dev_put(struct net_device *dev)
1115 {
1116         atomic_dec(&dev->refcnt);
1117 }
1118
1119 /**
1120  *      dev_hold - get reference to device
1121  *      @dev: network device
1122  *
1123  * Hold reference to device to keep it from being freed.
1124  */
1125 static inline void dev_hold(struct net_device *dev)
1126 {
1127         atomic_inc(&dev->refcnt);
1128 }
1129
1130 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
1131  * and _off may be called from IRQ context, but it is caller
1132  * who is responsible for serialization of these calls.
1133  *
1134  * The name carrier is inappropriate, these functions should really be
1135  * called netif_lowerlayer_*() because they represent the state of any
1136  * kind of lower layer not just hardware media.
1137  */
1138
1139 extern void linkwatch_fire_event(struct net_device *dev);
1140
1141 /**
1142  *      netif_carrier_ok - test if carrier present
1143  *      @dev: network device
1144  *
1145  * Check if carrier is present on device
1146  */
1147 static inline int netif_carrier_ok(const struct net_device *dev)
1148 {
1149         return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
1150 }
1151
1152 extern void __netdev_watchdog_up(struct net_device *dev);
1153
1154 extern void netif_carrier_on(struct net_device *dev);
1155
1156 extern void netif_carrier_off(struct net_device *dev);
1157
1158 /**
1159  *      netif_dormant_on - mark device as dormant.
1160  *      @dev: network device
1161  *
1162  * Mark device as dormant (as per RFC2863).
1163  *
1164  * The dormant state indicates that the relevant interface is not
1165  * actually in a condition to pass packets (i.e., it is not 'up') but is
1166  * in a "pending" state, waiting for some external event.  For "on-
1167  * demand" interfaces, this new state identifies the situation where the
1168  * interface is waiting for events to place it in the up state.
1169  *
1170  */
1171 static inline void netif_dormant_on(struct net_device *dev)
1172 {
1173         if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
1174                 linkwatch_fire_event(dev);
1175 }
1176
1177 /**
1178  *      netif_dormant_off - set device as not dormant.
1179  *      @dev: network device
1180  *
1181  * Device is not in dormant state.
1182  */
1183 static inline void netif_dormant_off(struct net_device *dev)
1184 {
1185         if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
1186                 linkwatch_fire_event(dev);
1187 }
1188
1189 /**
1190  *      netif_dormant - test if carrier present
1191  *      @dev: network device
1192  *
1193  * Check if carrier is present on device
1194  */
1195 static inline int netif_dormant(const struct net_device *dev)
1196 {
1197         return test_bit(__LINK_STATE_DORMANT, &dev->state);
1198 }
1199
1200
1201 /**
1202  *      netif_oper_up - test if device is operational
1203  *      @dev: network device
1204  *
1205  * Check if carrier is operational
1206  */
1207 static inline int netif_oper_up(const struct net_device *dev) {
1208         return (dev->operstate == IF_OPER_UP ||
1209                 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
1210 }
1211
1212 /**
1213  *      netif_device_present - is device available or removed
1214  *      @dev: network device
1215  *
1216  * Check if device has not been removed from system.
1217  */
1218 static inline int netif_device_present(struct net_device *dev)
1219 {
1220         return test_bit(__LINK_STATE_PRESENT, &dev->state);
1221 }
1222
1223 extern void netif_device_detach(struct net_device *dev);
1224
1225 extern void netif_device_attach(struct net_device *dev);
1226
1227 /*
1228  * Network interface message level settings
1229  */
1230 #define HAVE_NETIF_MSG 1
1231
1232 enum {
1233         NETIF_MSG_DRV           = 0x0001,
1234         NETIF_MSG_PROBE         = 0x0002,
1235         NETIF_MSG_LINK          = 0x0004,
1236         NETIF_MSG_TIMER         = 0x0008,
1237         NETIF_MSG_IFDOWN        = 0x0010,
1238         NETIF_MSG_IFUP          = 0x0020,
1239         NETIF_MSG_RX_ERR        = 0x0040,
1240         NETIF_MSG_TX_ERR        = 0x0080,
1241         NETIF_MSG_TX_QUEUED     = 0x0100,
1242         NETIF_MSG_INTR          = 0x0200,
1243         NETIF_MSG_TX_DONE       = 0x0400,
1244         NETIF_MSG_RX_STATUS     = 0x0800,
1245         NETIF_MSG_PKTDATA       = 0x1000,
1246         NETIF_MSG_HW            = 0x2000,
1247         NETIF_MSG_WOL           = 0x4000,
1248 };
1249
1250 #define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
1251 #define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
1252 #define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
1253 #define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
1254 #define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
1255 #define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
1256 #define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
1257 #define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
1258 #define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
1259 #define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
1260 #define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
1261 #define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
1262 #define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
1263 #define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
1264 #define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
1265
1266 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
1267 {
1268         /* use default */
1269         if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
1270                 return default_msg_enable_bits;
1271         if (debug_value == 0)   /* no output */
1272                 return 0;
1273         /* set low N bits */
1274         return (1 << debug_value) - 1;
1275 }
1276
1277 /* Test if receive needs to be scheduled but only if up */
1278 static inline int netif_rx_schedule_prep(struct net_device *dev,
1279                                          struct napi_struct *napi)
1280 {
1281         return napi_schedule_prep(napi);
1282 }
1283
1284 /* Add interface to tail of rx poll list. This assumes that _prep has
1285  * already been called and returned 1.
1286  */
1287 static inline void __netif_rx_schedule(struct net_device *dev,
1288                                        struct napi_struct *napi)
1289 {
1290         __napi_schedule(napi);
1291 }
1292
1293 /* Try to reschedule poll. Called by irq handler. */
1294
1295 static inline void netif_rx_schedule(struct net_device *dev,
1296                                      struct napi_struct *napi)
1297 {
1298         if (netif_rx_schedule_prep(dev, napi))
1299                 __netif_rx_schedule(dev, napi);
1300 }
1301
1302 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().  */
1303 static inline int netif_rx_reschedule(struct net_device *dev,
1304                                       struct napi_struct *napi)
1305 {
1306         if (napi_schedule_prep(napi)) {
1307                 __netif_rx_schedule(dev, napi);
1308                 return 1;
1309         }
1310         return 0;
1311 }
1312
1313 /* same as netif_rx_complete, except that local_irq_save(flags)
1314  * has already been issued
1315  */
1316 static inline void __netif_rx_complete(struct net_device *dev,
1317                                        struct napi_struct *napi)
1318 {
1319         __napi_complete(napi);
1320 }
1321
1322 /* Remove interface from poll list: it must be in the poll list
1323  * on current cpu. This primitive is called by dev->poll(), when
1324  * it completes the work. The device cannot be out of poll list at this
1325  * moment, it is BUG().
1326  */
1327 static inline void netif_rx_complete(struct net_device *dev,
1328                                      struct napi_struct *napi)
1329 {
1330         unsigned long flags;
1331
1332         local_irq_save(flags);
1333         __netif_rx_complete(dev, napi);
1334         local_irq_restore(flags);
1335 }
1336
1337 /**
1338  *      netif_tx_lock - grab network device transmit lock
1339  *      @dev: network device
1340  *      @cpu: cpu number of lock owner
1341  *
1342  * Get network device transmit lock
1343  */
1344 static inline void __netif_tx_lock(struct net_device *dev, int cpu)
1345 {
1346         spin_lock(&dev->_xmit_lock);
1347         dev->xmit_lock_owner = cpu;
1348 }
1349
1350 static inline void netif_tx_lock(struct net_device *dev)
1351 {
1352         __netif_tx_lock(dev, smp_processor_id());
1353 }
1354
1355 static inline void netif_tx_lock_bh(struct net_device *dev)
1356 {
1357         spin_lock_bh(&dev->_xmit_lock);
1358         dev->xmit_lock_owner = smp_processor_id();
1359 }
1360
1361 static inline int netif_tx_trylock(struct net_device *dev)
1362 {
1363         int ok = spin_trylock(&dev->_xmit_lock);
1364         if (likely(ok))
1365                 dev->xmit_lock_owner = smp_processor_id();
1366         return ok;
1367 }
1368
1369 static inline void netif_tx_unlock(struct net_device *dev)
1370 {
1371         dev->xmit_lock_owner = -1;
1372         spin_unlock(&dev->_xmit_lock);
1373 }
1374
1375 static inline void netif_tx_unlock_bh(struct net_device *dev)
1376 {
1377         dev->xmit_lock_owner = -1;
1378         spin_unlock_bh(&dev->_xmit_lock);
1379 }
1380
1381 #define HARD_TX_LOCK(dev, cpu) {                        \
1382         if ((dev->features & NETIF_F_LLTX) == 0) {      \
1383                 __netif_tx_lock(dev, cpu);                      \
1384         }                                               \
1385 }
1386
1387 #define HARD_TX_UNLOCK(dev) {                           \
1388         if ((dev->features & NETIF_F_LLTX) == 0) {      \
1389                 netif_tx_unlock(dev);                   \
1390         }                                               \
1391 }
1392
1393 static inline void netif_tx_disable(struct net_device *dev)
1394 {
1395         netif_tx_lock_bh(dev);
1396         netif_stop_queue(dev);
1397         netif_tx_unlock_bh(dev);
1398 }
1399
1400 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
1401
1402 extern void             ether_setup(struct net_device *dev);
1403
1404 /* Support for loadable net-drivers */
1405 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
1406                                        void (*setup)(struct net_device *),
1407                                        unsigned int queue_count);
1408 #define alloc_netdev(sizeof_priv, name, setup) \
1409         alloc_netdev_mq(sizeof_priv, name, setup, 1)
1410 extern int              register_netdev(struct net_device *dev);
1411 extern void             unregister_netdev(struct net_device *dev);
1412 /* Functions used for secondary unicast and multicast support */
1413 extern void             dev_set_rx_mode(struct net_device *dev);
1414 extern void             __dev_set_rx_mode(struct net_device *dev);
1415 extern int              dev_unicast_delete(struct net_device *dev, void *addr, int alen);
1416 extern int              dev_unicast_add(struct net_device *dev, void *addr, int alen);
1417 extern int              dev_unicast_sync(struct net_device *to, struct net_device *from);
1418 extern void             dev_unicast_unsync(struct net_device *to, struct net_device *from);
1419 extern int              dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
1420 extern int              dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
1421 extern int              dev_mc_sync(struct net_device *to, struct net_device *from);
1422 extern void             dev_mc_unsync(struct net_device *to, struct net_device *from);
1423 extern int              __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all);
1424 extern int              __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly);
1425 extern int              __dev_addr_sync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count);
1426 extern void             __dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count);
1427 extern void             dev_set_promiscuity(struct net_device *dev, int inc);
1428 extern void             dev_set_allmulti(struct net_device *dev, int inc);
1429 extern void             netdev_state_change(struct net_device *dev);
1430 extern void             netdev_features_change(struct net_device *dev);
1431 /* Load a device via the kmod */
1432 extern void             dev_load(struct net *net, const char *name);
1433 extern void             dev_mcast_init(void);
1434 extern int              netdev_max_backlog;
1435 extern int              weight_p;
1436 extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
1437 extern int skb_checksum_help(struct sk_buff *skb);
1438 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
1439 #ifdef CONFIG_BUG
1440 extern void netdev_rx_csum_fault(struct net_device *dev);
1441 #else
1442 static inline void netdev_rx_csum_fault(struct net_device *dev)
1443 {
1444 }
1445 #endif
1446 /* rx skb timestamps */
1447 extern void             net_enable_timestamp(void);
1448 extern void             net_disable_timestamp(void);
1449
1450 #ifdef CONFIG_PROC_FS
1451 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
1452 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
1453 extern void dev_seq_stop(struct seq_file *seq, void *v);
1454 #endif
1455
1456 extern void linkwatch_run_queue(void);
1457
1458 extern int netdev_compute_features(unsigned long all, unsigned long one);
1459
1460 static inline int net_gso_ok(int features, int gso_type)
1461 {
1462         int feature = gso_type << NETIF_F_GSO_SHIFT;
1463         return (features & feature) == feature;
1464 }
1465
1466 static inline int skb_gso_ok(struct sk_buff *skb, int features)
1467 {
1468         return net_gso_ok(features, skb_shinfo(skb)->gso_type);
1469 }
1470
1471 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
1472 {
1473         return skb_is_gso(skb) &&
1474                (!skb_gso_ok(skb, dev->features) ||
1475                 unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
1476 }
1477
1478 /* On bonding slaves other than the currently active slave, suppress
1479  * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
1480  * ARP on active-backup slaves with arp_validate enabled.
1481  */
1482 static inline int skb_bond_should_drop(struct sk_buff *skb)
1483 {
1484         struct net_device *dev = skb->dev;
1485         struct net_device *master = dev->master;
1486
1487         if (master &&
1488             (dev->priv_flags & IFF_SLAVE_INACTIVE)) {
1489                 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
1490                     skb->protocol == __constant_htons(ETH_P_ARP))
1491                         return 0;
1492
1493                 if (master->priv_flags & IFF_MASTER_ALB) {
1494                         if (skb->pkt_type != PACKET_BROADCAST &&
1495                             skb->pkt_type != PACKET_MULTICAST)
1496                                 return 0;
1497                 }
1498                 if (master->priv_flags & IFF_MASTER_8023AD &&
1499                     skb->protocol == __constant_htons(ETH_P_SLOW))
1500                         return 0;
1501
1502                 return 1;
1503         }
1504         return 0;
1505 }
1506
1507 #endif /* __KERNEL__ */
1508
1509 #endif  /* _LINUX_DEV_H */