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 };
 323
 324 extern void FASTCALL(__napi_schedule(struct napi_struct *n));
 325
 326 /**
 327  *      napi_schedule_prep - check if napi can be scheduled
 328  *      @n: napi context
 329  *
 330  * Test if NAPI routine is already running, and if not mark
 331  * it as running.  This is used as a condition variable
 332  * insure only one NAPI poll instance runs
 333  */
 334 static inline int napi_schedule_prep(struct napi_struct *n)
 335 {
 336         return !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
 337 }
 338
 339 /**
 340  *      napi_schedule - schedule NAPI poll
 341  *      @n: napi context
 342  *
 343  * Schedule NAPI poll routine to be called if it is not already
 344  * running.
 345  */
 346 static inline void napi_schedule(struct napi_struct *n)
 347 {
 348         if (napi_schedule_prep(n))
 349                 __napi_schedule(n);
 350 }
 351
 352 /* Try to reschedule poll. Called by dev->poll() after napi_complete().  */
 353 static inline int napi_reschedule(struct napi_struct *napi)
 354 {
 355         if (napi_schedule_prep(napi)) {
 356                 __napi_schedule(napi);
 357                 return 1;
 358         }
 359         return 0;
 360 }
 361
 362 /**
 363  *      napi_complete - NAPI processing complete
 364  *      @n: napi context
 365  *
 366  * Mark NAPI processing as complete.
 367  */
 368 static inline void __napi_complete(struct napi_struct *n)
 369 {
 370         BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
 371         list_del(&n->poll_list);
 372         smp_mb__before_clear_bit();
 373         clear_bit(NAPI_STATE_SCHED, &n->state);
 374 }
 375
 376 static inline void napi_complete(struct napi_struct *n)
 377 {
 378         local_irq_disable();
 379         __napi_complete(n);
 380         local_irq_enable();
 381 }
 382
 383 /**
 384  *      napi_disable - prevent NAPI from scheduling
 385  *      @n: napi context
 386  *
 387  * Stop NAPI from being scheduled on this context.
 388  * Waits till any outstanding processing completes.
 389  */
 390 static inline void napi_disable(struct napi_struct *n)
 391 {
 392         while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
 393                 msleep_interruptible(1);
 394 }
 395
 396 /**
 397  *      napi_enable - enable NAPI scheduling
 398  *      @n: napi context
 399  *
 400  * Resume NAPI from being scheduled on this context.
 401  * Must be paired with napi_disable.
 402  */
 403 static inline void napi_enable(struct napi_struct *n)
 404 {
 405         BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
 406         smp_mb__before_clear_bit();
 407         clear_bit(NAPI_STATE_SCHED, &n->state);
 408 }
 409
 410 #ifdef CONFIG_SMP
 411 /**
 412  *      napi_synchronize - wait until NAPI is not running
 413  *      @n: napi context
 414  *
 415  * Wait until NAPI is done being scheduled on this context.
 416  * Waits till any outstanding processing completes but
 417  * does not disable future activations.
 418  */
 419 static inline void napi_synchronize(const struct napi_struct *n)
 420 {
 421         while (test_bit(NAPI_STATE_SCHED, &n->state))
 422                 msleep(1);
 423 }
 424 #else
 425 # define napi_synchronize(n)    barrier()
 426 #endif
 427
 428 /*
 429  *      The DEVICE structure.
 430  *      Actually, this whole structure is a big mistake.  It mixes I/O
 431  *      data with strictly "high-level" data, and it has to know about
 432  *      almost every data structure used in the INET module.
 433  *
 434  *      FIXME: cleanup struct net_device such that network protocol info
 435  *      moves out.
 436  */
 437
 438 struct net_device
 439 {
 440
 441         /*
 442          * This is the first field of the "visible" part of this structure
 443          * (i.e. as seen by users in the "Space.c" file).  It is the name
 444          * the interface.
 445          */
 446         char                    name[IFNAMSIZ];
 447         /* device name hash chain */
 448         struct hlist_node       name_hlist;
 449
 450         /*
 451          *      I/O specific fields
 452          *      FIXME: Merge these and struct ifmap into one
 453          */
 454         unsigned long           mem_end;        /* shared mem end       */
 455         unsigned long           mem_start;      /* shared mem start     */
 456         unsigned long           base_addr;      /* device I/O address   */
 457         unsigned int            irq;            /* device IRQ number    */
 458
 459         /*
 460          *      Some hardware also needs these fields, but they are not
 461          *      part of the usual set specified in Space.c.
 462          */
 463
 464         unsigned char           if_port;        /* Selectable AUI, TP,..*/
 465         unsigned char           dma;            /* DMA channel          */
 466
 467         unsigned long           state;
 468
 469         struct list_head        dev_list;
 470 #ifdef CONFIG_NETPOLL
 471         struct list_head        napi_list;
 472 #endif
 473
 474         /* The device initialization function. Called only once. */
 475         int                     (*init)(struct net_device *dev);
 476
 477         /* ------- Fields preinitialized in Space.c finish here ------- */
 478
 479         /* Net device features */
 480         unsigned long           features;
 481 #define NETIF_F_SG              1       /* Scatter/gather IO. */
 482 #define NETIF_F_IP_CSUM         2       /* Can checksum TCP/UDP over IPv4. */
 483 #define NETIF_F_NO_CSUM         4       /* Does not require checksum. F.e. loopack. */
 484 #define NETIF_F_HW_CSUM         8       /* Can checksum all the packets. */
 485 #define NETIF_F_IPV6_CSUM       16      /* Can checksum TCP/UDP over IPV6 */
 486 #define NETIF_F_HIGHDMA         32      /* Can DMA to high memory. */
 487 #define NETIF_F_FRAGLIST        64      /* Scatter/gather IO. */
 488 #define NETIF_F_HW_VLAN_TX      128     /* Transmit VLAN hw acceleration */
 489 #define NETIF_F_HW_VLAN_RX      256     /* Receive VLAN hw acceleration */
 490 #define NETIF_F_HW_VLAN_FILTER  512     /* Receive filtering on VLAN */
 491 #define NETIF_F_VLAN_CHALLENGED 1024    /* Device cannot handle VLAN packets */
 492 #define NETIF_F_GSO             2048    /* Enable software GSO. */
 493 #define NETIF_F_LLTX            4096    /* LockLess TX - deprecated. Please */
 494                                         /* do not use LLTX in new drivers */
 495 #define NETIF_F_NETNS_LOCAL     8192    /* Does not change network namespaces */
 496 #define NETIF_F_MULTI_QUEUE     16384   /* Has multiple TX/RX queues */
 497 #define NETIF_F_LRO             32768   /* large receive offload */
 498
 499         /* Segmentation offload features */
 500 #define NETIF_F_GSO_SHIFT       16
 501 #define NETIF_F_GSO_MASK        0xffff0000
 502 #define NETIF_F_TSO             (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
 503 #define NETIF_F_UFO             (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
 504 #define NETIF_F_GSO_ROBUST      (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
 505 #define NETIF_F_TSO_ECN         (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
 506 #define NETIF_F_TSO6            (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
 507
 508         /* List of features with software fallbacks. */
 509 #define NETIF_F_GSO_SOFTWARE    (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
 510
 511
 512 #define NETIF_F_GEN_CSUM        (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
 513 #define NETIF_F_V4_CSUM         (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
 514 #define NETIF_F_V6_CSUM         (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
 515 #define NETIF_F_ALL_CSUM        (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
 516
 517         struct net_device       *next_sched;
 518
 519         /* Interface index. Unique device identifier    */
 520         int                     ifindex;
 521         int                     iflink;
 522
 523
 524         struct net_device_stats* (*get_stats)(struct net_device *dev);
 525         struct net_device_stats stats;
 526
 527 #ifdef CONFIG_WIRELESS_EXT
 528         /* List of functions to handle Wireless Extensions (instead of ioctl).
 529          * See <net/iw_handler.h> for details. Jean II */
 530         const struct iw_handler_def *   wireless_handlers;
 531         /* Instance data managed by the core of Wireless Extensions. */
 532         struct iw_public_data * wireless_data;
 533 #endif
 534         const struct ethtool_ops *ethtool_ops;
 535
 536         /* Hardware header description */
 537         const struct header_ops *header_ops;
 538
 539         /*
 540          * This marks the end of the "visible" part of the structure. All
 541          * fields hereafter are internal to the system, and may change at
 542          * will (read: may be cleaned up at will).
 543          */
 544
 545
 546         unsigned int            flags;  /* interface flags (a la BSD)   */
 547         unsigned short          gflags;
 548         unsigned short          priv_flags; /* Like 'flags' but invisible to userspace. */
 549         unsigned short          padded; /* How much padding added by alloc_netdev() */
 550
 551         unsigned char           operstate; /* RFC2863 operstate */
 552         unsigned char           link_mode; /* mapping policy to operstate */
 553
 554         unsigned                mtu;    /* interface MTU value          */
 555         unsigned short          type;   /* interface hardware type      */
 556         unsigned short          hard_header_len;        /* hardware hdr length  */
 557
 558         struct net_device       *master; /* Pointer to master device of a group,
 559                                           * which this device is member of.
 560                                           */
 561
 562         /* Interface address info. */
 563         unsigned char           perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
 564         unsigned char           addr_len;       /* hardware address length      */
 565         unsigned short          dev_id;         /* for shared network cards */
 566
 567         struct dev_addr_list    *uc_list;       /* Secondary unicast mac addresses */
 568         int                     uc_count;       /* Number of installed ucasts   */
 569         int                     uc_promisc;
 570         struct dev_addr_list    *mc_list;       /* Multicast mac addresses      */
 571         int                     mc_count;       /* Number of installed mcasts   */
 572         int                     promiscuity;
 573         int                     allmulti;
 574
 575
 576         /* Protocol specific pointers */
 577
 578         void                    *atalk_ptr;     /* AppleTalk link       */
 579         void                    *ip_ptr;        /* IPv4 specific data   */
 580         void                    *dn_ptr;        /* DECnet specific data */
 581         void                    *ip6_ptr;       /* IPv6 specific data */
 582         void                    *ec_ptr;        /* Econet specific data */
 583         void                    *ax25_ptr;      /* AX.25 specific data */
 584         struct wireless_dev     *ieee80211_ptr; /* IEEE 802.11 specific data,
 585                                                    assign before registering */
 586
 587 /*
 588  * Cache line mostly used on receive path (including eth_type_trans())
 589  */
 590         unsigned long           last_rx;        /* Time of last Rx      */
 591         /* Interface address info used in eth_type_trans() */
 592         unsigned char           dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast
 593                                                         because most packets are unicast) */
 594
 595         unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
 596
 597 /*
 598  * Cache line mostly used on queue transmit path (qdisc)
 599  */
 600         /* device queue lock */
 601         spinlock_t              queue_lock ____cacheline_aligned_in_smp;
 602         struct Qdisc            *qdisc;
 603         struct Qdisc            *qdisc_sleeping;
 604         struct list_head        qdisc_list;
 605         unsigned long           tx_queue_len;   /* Max frames per queue allowed */
 606
 607         /* Partially transmitted GSO packet. */
 608         struct sk_buff          *gso_skb;
 609
 610         /* ingress path synchronizer */
 611         spinlock_t              ingress_lock;
 612         struct Qdisc            *qdisc_ingress;
 613
 614 /*
 615  * One part is mostly used on xmit path (device)
 616  */
 617         /* hard_start_xmit synchronizer */
 618         spinlock_t              _xmit_lock ____cacheline_aligned_in_smp;
 619         /* cpu id of processor entered to hard_start_xmit or -1,
 620            if nobody entered there.
 621          */
 622         int                     xmit_lock_owner;
 623         void                    *priv;  /* pointer to private data      */
 624         int                     (*hard_start_xmit) (struct sk_buff *skb,
 625                                                     struct net_device *dev);
 626         /* These may be needed for future network-power-down code. */
 627         unsigned long           trans_start;    /* Time (in jiffies) of last Tx */
 628
 629         int                     watchdog_timeo; /* used by dev_watchdog() */
 630         struct timer_list       watchdog_timer;
 631
 632 /*
 633  * refcnt is a very hot point, so align it on SMP
 634  */
 635         /* Number of references to this device */
 636         atomic_t                refcnt ____cacheline_aligned_in_smp;
 637
 638         /* delayed register/unregister */
 639         struct list_head        todo_list;
 640         /* device index hash chain */
 641         struct hlist_node       index_hlist;
 642
 643         struct net_device       *link_watch_next;
 644
 645         /* register/unregister state machine */
 646         enum { NETREG_UNINITIALIZED=0,
 647                NETREG_REGISTERED,       /* completed register_netdevice */
 648                NETREG_UNREGISTERING,    /* called unregister_netdevice */
 649                NETREG_UNREGISTERED,     /* completed unregister todo */
 650                NETREG_RELEASED,         /* called free_netdev */
 651         } reg_state;
 652
 653         /* Called after device is detached from network. */
 654         void                    (*uninit)(struct net_device *dev);
 655         /* Called after last user reference disappears. */
 656         void                    (*destructor)(struct net_device *dev);
 657
 658         /* Pointers to interface service routines.      */
 659         int                     (*open)(struct net_device *dev);
 660         int                     (*stop)(struct net_device *dev);
 661 #define HAVE_NETDEV_POLL
 662 #define HAVE_CHANGE_RX_FLAGS
 663         void                    (*change_rx_flags)(struct net_device *dev,
 664                                                    int flags);
 665 #define HAVE_SET_RX_MODE
 666         void                    (*set_rx_mode)(struct net_device *dev);
 667 #define HAVE_MULTICAST
 668         void                    (*set_multicast_list)(struct net_device *dev);
 669 #define HAVE_SET_MAC_ADDR
 670         int                     (*set_mac_address)(struct net_device *dev,
 671                                                    void *addr);
 672 #define HAVE_PRIVATE_IOCTL
 673         int                     (*do_ioctl)(struct net_device *dev,
 674                                             struct ifreq *ifr, int cmd);
 675 #define HAVE_SET_CONFIG
 676         int                     (*set_config)(struct net_device *dev,
 677                                               struct ifmap *map);
 678 #define HAVE_CHANGE_MTU
 679         int                     (*change_mtu)(struct net_device *dev, int new_mtu);
 680
 681 #define HAVE_TX_TIMEOUT
 682         void                    (*tx_timeout) (struct net_device *dev);
 683
 684         void                    (*vlan_rx_register)(struct net_device *dev,
 685                                                     struct vlan_group *grp);
 686         void                    (*vlan_rx_add_vid)(struct net_device *dev,
 687                                                    unsigned short vid);
 688         void                    (*vlan_rx_kill_vid)(struct net_device *dev,
 689                                                     unsigned short vid);
 690
 691         int                     (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
 692 #ifdef CONFIG_NETPOLL
 693         struct netpoll_info     *npinfo;
 694 #endif
 695 #ifdef CONFIG_NET_POLL_CONTROLLER
 696         void                    (*poll_controller)(struct net_device *dev);
 697 #endif
 698
 699         /* Network namespace this network device is inside */
 700         struct net              *nd_net;
 701
 702         /* bridge stuff */
 703         struct net_bridge_port  *br_port;
 704         /* macvlan */
 705         struct macvlan_port     *macvlan_port;
 706
 707         /* class/net/name entry */
 708         struct device           dev;
 709         /* space for optional statistics and wireless sysfs groups */
 710         struct attribute_group  *sysfs_groups[3];
 711
 712         /* rtnetlink link ops */
 713         const struct rtnl_link_ops *rtnl_link_ops;
 714
 715         /* The TX queue control structures */
 716         unsigned int                    egress_subqueue_count;
 717         struct net_device_subqueue      egress_subqueue[1];
 718 };
 719 #define to_net_dev(d) container_of(d, struct net_device, dev)
 720
 721 #define NETDEV_ALIGN            32
 722 #define NETDEV_ALIGN_CONST      (NETDEV_ALIGN - 1)
 723
 724 /**
 725  *      netdev_priv - access network device private data
 726  *      @dev: network device
 727  *
 728  * Get network device private data
 729  */
 730 static inline void *netdev_priv(const struct net_device *dev)
 731 {
 732         return dev->priv;
 733 }
 734
 735 /* Set the sysfs physical device reference for the network logical device
 736  * if set prior to registration will cause a symlink during initialization.
 737  */
 738 #define SET_NETDEV_DEV(net, pdev)       ((net)->dev.parent = (pdev))
 739
 740 static inline void netif_napi_add(struct net_device *dev,
 741                                   struct napi_struct *napi,
 742                                   int (*poll)(struct napi_struct *, int),
 743                                   int weight)
 744 {
 745         INIT_LIST_HEAD(&napi->poll_list);
 746         napi->poll = poll;
 747         napi->weight = weight;
 748 #ifdef CONFIG_NETPOLL
 749         napi->dev = dev;
 750         list_add(&napi->dev_list, &dev->napi_list);
 751         spin_lock_init(&napi->poll_lock);
 752         napi->poll_owner = -1;
 753 #endif
 754         set_bit(NAPI_STATE_SCHED, &napi->state);
 755 }
 756
 757 struct packet_type {
 758         __be16                  type;   /* This is really htons(ether_type). */
 759         struct net_device       *dev;   /* NULL is wildcarded here           */
 760         int                     (*func) (struct sk_buff *,
 761                                          struct net_device *,
 762                                          struct packet_type *,
 763                                          struct net_device *);
 764         struct sk_buff          *(*gso_segment)(struct sk_buff *skb,
 765                                                 int features);
 766         int                     (*gso_send_check)(struct sk_buff *skb);
 767         void                    *af_packet_priv;
 768         struct list_head        list;
 769 };
 770
 771 #include <linux/interrupt.h>
 772 #include <linux/notifier.h>
 773
 774 extern rwlock_t                         dev_base_lock;          /* Device list lock */
 775
 776
 777 #define for_each_netdev(net, d)         \
 778                 list_for_each_entry(d, &(net)->dev_base_head, dev_list)
 779 #define for_each_netdev_safe(net, d, n) \
 780                 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
 781 #define for_each_netdev_continue(net, d)                \
 782                 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
 783 #define net_device_entry(lh)    list_entry(lh, struct net_device, dev_list)
 784
 785 static inline struct net_device *next_net_device(struct net_device *dev)
 786 {
 787         struct list_head *lh;
 788         struct net *net;
 789
 790         net = dev->nd_net;
 791         lh = dev->dev_list.next;
 792         return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
 793 }
 794
 795 static inline struct net_device *first_net_device(struct net *net)
 796 {
 797         return list_empty(&net->dev_base_head) ? NULL :
 798                 net_device_entry(net->dev_base_head.next);
 799 }
 800
 801 extern int                      netdev_boot_setup_check(struct net_device *dev);
 802 extern unsigned long            netdev_boot_base(const char *prefix, int unit);
 803 extern struct net_device    *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr);
 804 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
 805 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
 806 extern void             dev_add_pack(struct packet_type *pt);
 807 extern void             dev_remove_pack(struct packet_type *pt);
 808 extern void             __dev_remove_pack(struct packet_type *pt);
 809
 810 extern struct net_device        *dev_get_by_flags(struct net *net, unsigned short flags,
 811                                                   unsigned short mask);
 812 extern struct net_device        *dev_get_by_name(struct net *net, const char *name);
 813 extern struct net_device        *__dev_get_by_name(struct net *net, const char *name);
 814 extern int              dev_alloc_name(struct net_device *dev, const char *name);
 815 extern int              dev_open(struct net_device *dev);
 816 extern int              dev_close(struct net_device *dev);
 817 extern int              dev_queue_xmit(struct sk_buff *skb);
 818 extern int              register_netdevice(struct net_device *dev);
 819 extern void             unregister_netdevice(struct net_device *dev);
 820 extern void             free_netdev(struct net_device *dev);
 821 extern void             synchronize_net(void);
 822 extern int              register_netdevice_notifier(struct notifier_block *nb);
 823 extern int              unregister_netdevice_notifier(struct notifier_block *nb);
 824 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
 825 extern struct net_device        *dev_get_by_index(struct net *net, int ifindex);
 826 extern struct net_device        *__dev_get_by_index(struct net *net, int ifindex);
 827 extern int              dev_restart(struct net_device *dev);
 828 #ifdef CONFIG_NETPOLL_TRAP
 829 extern int              netpoll_trap(void);
 830 #endif
 831
 832 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 833                                   unsigned short type,
 834                                   const void *daddr, const void *saddr,
 835                                   unsigned len)
 836 {
 837         if (!dev->header_ops)
 838                 return 0;
 839
 840         return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
 841 }
 842
 843 static inline int dev_parse_header(const struct sk_buff *skb,
 844                                    unsigned char *haddr)
 845 {
 846         const struct net_device *dev = skb->dev;
 847
 848         if (!dev->header_ops || !dev->header_ops->parse)
 849                 return 0;
 850         return dev->header_ops->parse(skb, haddr);
 851 }
 852
 853 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
 854 extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
 855 static inline int unregister_gifconf(unsigned int family)
 856 {
 857         return register_gifconf(family, NULL);
 858 }
 859
 860 /*
 861  * Incoming packets are placed on per-cpu queues so that
 862  * no locking is needed.
 863  */
 864 struct softnet_data
 865 {
 866         struct net_device       *output_queue;
 867         struct sk_buff_head     input_pkt_queue;
 868         struct list_head        poll_list;
 869         struct sk_buff          *completion_queue;
 870
 871         struct napi_struct      backlog;
 872 #ifdef CONFIG_NET_DMA
 873         struct dma_chan         *net_dma;
 874 #endif
 875 };
 876
 877 DECLARE_PER_CPU(struct softnet_data,softnet_data);
 878
 879 #define HAVE_NETIF_QUEUE
 880
 881 extern void __netif_schedule(struct net_device *dev);
 882
 883 static inline void netif_schedule(struct net_device *dev)
 884 {
 885         if (!test_bit(__LINK_STATE_XOFF, &dev->state))
 886                 __netif_schedule(dev);
 887 }
 888
 889 /**
 890  *      netif_start_queue - allow transmit
 891  *      @dev: network device
 892  *
 893  *      Allow upper layers to call the device hard_start_xmit routine.
 894  */
 895 static inline void netif_start_queue(struct net_device *dev)
 896 {
 897         clear_bit(__LINK_STATE_XOFF, &dev->state);
 898 }
 899
 900 /**
 901  *      netif_wake_queue - restart transmit
 902  *      @dev: network device
 903  *
 904  *      Allow upper layers to call the device hard_start_xmit routine.
 905  *      Used for flow control when transmit resources are available.
 906  */
 907 static inline void netif_wake_queue(struct net_device *dev)
 908 {
 909 #ifdef CONFIG_NETPOLL_TRAP
 910         if (netpoll_trap()) {
 911                 clear_bit(__LINK_STATE_XOFF, &dev->state);
 912                 return;
 913         }
 914 #endif
 915         if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
 916                 __netif_schedule(dev);
 917 }
 918
 919 /**
 920  *      netif_stop_queue - stop transmitted packets
 921  *      @dev: network device
 922  *
 923  *      Stop upper layers calling the device hard_start_xmit routine.
 924  *      Used for flow control when transmit resources are unavailable.
 925  */
 926 static inline void netif_stop_queue(struct net_device *dev)
 927 {
 928         set_bit(__LINK_STATE_XOFF, &dev->state);
 929 }
 930
 931 /**
 932  *      netif_queue_stopped - test if transmit queue is flowblocked
 933  *      @dev: network device
 934  *
 935  *      Test if transmit queue on device is currently unable to send.
 936  */
 937 static inline int netif_queue_stopped(const struct net_device *dev)
 938 {
 939         return test_bit(__LINK_STATE_XOFF, &dev->state);
 940 }
 941
 942 /**
 943  *      netif_running - test if up
 944  *      @dev: network device
 945  *
 946  *      Test if the device has been brought up.
 947  */
 948 static inline int netif_running(const struct net_device *dev)
 949 {
 950         return test_bit(__LINK_STATE_START, &dev->state);
 951 }
 952
 953 /*
 954  * Routines to manage the subqueues on a device.  We only need start
 955  * stop, and a check if it's stopped.  All other device management is
 956  * done at the overall netdevice level.
 957  * Also test the device if we're multiqueue.
 958  */
 959
 960 /**
 961  *      netif_start_subqueue - allow sending packets on subqueue
 962  *      @dev: network device
 963  *      @queue_index: sub queue index
 964  *
 965  * Start individual transmit queue of a device with multiple transmit queues.
 966  */
 967 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
 968 {
 969 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
 970         clear_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state);
 971 #endif
 972 }
 973
 974 /**
 975  *      netif_stop_subqueue - stop sending packets on subqueue
 976  *      @dev: network device
 977  *      @queue_index: sub queue index
 978  *
 979  * Stop individual transmit queue of a device with multiple transmit queues.
 980  */
 981 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
 982 {
 983 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
 984 #ifdef CONFIG_NETPOLL_TRAP
 985         if (netpoll_trap())
 986                 return;
 987 #endif
 988         set_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state);
 989 #endif
 990 }
 991
 992 /**
 993  *      netif_subqueue_stopped - test status of subqueue
 994  *      @dev: network device
 995  *      @queue_index: sub queue index
 996  *
 997  * Check individual transmit queue of a device with multiple transmit queues.
 998  */
 999 static inline int netif_subqueue_stopped(const struct net_device *dev,
1000                                          u16 queue_index)
1001 {
1002 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
1003         return test_bit(__LINK_STATE_XOFF,
1004                         &dev->egress_subqueue[queue_index].state);
1005 #else
1006         return 0;
1007 #endif
1008 }
1009
1010
1011 /**
1012  *      netif_wake_subqueue - allow sending packets on subqueue
1013  *      @dev: network device
1014  *      @queue_index: sub queue index
1015  *
1016  * Resume individual transmit queue of a device with multiple transmit queues.
1017  */
1018 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
1019 {
1020 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
1021 #ifdef CONFIG_NETPOLL_TRAP
1022         if (netpoll_trap())
1023                 return;
1024 #endif
1025         if (test_and_clear_bit(__LINK_STATE_XOFF,
1026                                &dev->egress_subqueue[queue_index].state))
1027                 __netif_schedule(dev);
1028 #endif
1029 }
1030
1031 /**
1032  *      netif_is_multiqueue - test if device has multiple transmit queues
1033  *      @dev: network device
1034  *
1035  * Check if device has multiple transmit queues
1036  * Always falls if NETDEVICE_MULTIQUEUE is not configured
1037  */
1038 static inline int netif_is_multiqueue(const struct net_device *dev)
1039 {
1040 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
1041         return (!!(NETIF_F_MULTI_QUEUE & dev->features));
1042 #else
1043         return 0;
1044 #endif
1045 }
1046
1047 /* Use this variant when it is known for sure that it
1048  * is executing from interrupt context.
1049  */
1050 extern void dev_kfree_skb_irq(struct sk_buff *skb);
1051
1052 /* Use this variant in places where it could be invoked
1053  * either from interrupt or non-interrupt context.
1054  */
1055 extern void dev_kfree_skb_any(struct sk_buff *skb);
1056
1057 #define HAVE_NETIF_RX 1
1058 extern int              netif_rx(struct sk_buff *skb);
1059 extern int              netif_rx_ni(struct sk_buff *skb);
1060 #define HAVE_NETIF_RECEIVE_SKB 1
1061 extern int              netif_receive_skb(struct sk_buff *skb);
1062 extern int              dev_valid_name(const char *name);
1063 extern int              dev_ioctl(struct net *net, unsigned int cmd, void __user *);
1064 extern int              dev_ethtool(struct net *net, struct ifreq *);
1065 extern unsigned         dev_get_flags(const struct net_device *);
1066 extern int              dev_change_flags(struct net_device *, unsigned);
1067 extern int              dev_change_name(struct net_device *, char *);
1068 extern int              dev_change_net_namespace(struct net_device *,
1069                                                  struct net *, const char *);
1070 extern int              dev_set_mtu(struct net_device *, int);
1071 extern int              dev_set_mac_address(struct net_device *,
1072                                             struct sockaddr *);
1073 extern int              dev_hard_start_xmit(struct sk_buff *skb,
1074                                             struct net_device *dev);
1075
1076 extern int              netdev_budget;
1077
1078 /* Called by rtnetlink.c:rtnl_unlock() */
1079 extern void netdev_run_todo(void);
1080
1081 /**
1082  *      dev_put - release reference to device
1083  *      @dev: network device
1084  *
1085  * Release reference to device to allow it to be freed.
1086  */
1087 static inline void dev_put(struct net_device *dev)
1088 {
1089         atomic_dec(&dev->refcnt);
1090 }
1091
1092 /**
1093  *      dev_hold - get reference to device
1094  *      @dev: network device
1095  *
1096  * Hold reference to device to keep it from being freed.
1097  */
1098 static inline void dev_hold(struct net_device *dev)
1099 {
1100         atomic_inc(&dev->refcnt);
1101 }
1102
1103 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
1104  * and _off may be called from IRQ context, but it is caller
1105  * who is responsible for serialization of these calls.
1106  *
1107  * The name carrier is inappropriate, these functions should really be
1108  * called netif_lowerlayer_*() because they represent the state of any
1109  * kind of lower layer not just hardware media.
1110  */
1111
1112 extern void linkwatch_fire_event(struct net_device *dev);
1113
1114 /**
1115  *      netif_carrier_ok - test if carrier present
1116  *      @dev: network device
1117  *
1118  * Check if carrier is present on device
1119  */
1120 static inline int netif_carrier_ok(const struct net_device *dev)
1121 {
1122         return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
1123 }
1124
1125 extern void __netdev_watchdog_up(struct net_device *dev);
1126
1127 extern void netif_carrier_on(struct net_device *dev);
1128
1129 extern void netif_carrier_off(struct net_device *dev);
1130
1131 /**
1132  *      netif_dormant_on - mark device as dormant.
1133  *      @dev: network device
1134  *
1135  * Mark device as dormant (as per RFC2863).
1136  *
1137  * The dormant state indicates that the relevant interface is not
1138  * actually in a condition to pass packets (i.e., it is not 'up') but is
1139  * in a "pending" state, waiting for some external event.  For "on-
1140  * demand" interfaces, this new state identifies the situation where the
1141  * interface is waiting for events to place it in the up state.
1142  *
1143  */
1144 static inline void netif_dormant_on(struct net_device *dev)
1145 {
1146         if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
1147                 linkwatch_fire_event(dev);
1148 }
1149
1150 /**
1151  *      netif_dormant_off - set device as not dormant.
1152  *      @dev: network device
1153  *
1154  * Device is not in dormant state.
1155  */
1156 static inline void netif_dormant_off(struct net_device *dev)
1157 {
1158         if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
1159                 linkwatch_fire_event(dev);
1160 }
1161
1162 /**
1163  *      netif_dormant - test if carrier present
1164  *      @dev: network device
1165  *
1166  * Check if carrier is present on device
1167  */
1168 static inline int netif_dormant(const struct net_device *dev)
1169 {
1170         return test_bit(__LINK_STATE_DORMANT, &dev->state);
1171 }
1172
1173
1174 /**
1175  *      netif_oper_up - test if device is operational
1176  *      @dev: network device
1177  *
1178  * Check if carrier is operational
1179  */
1180 static inline int netif_oper_up(const struct net_device *dev) {
1181         return (dev->operstate == IF_OPER_UP ||
1182                 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
1183 }
1184
1185 /**
1186  *      netif_device_present - is device available or removed
1187  *      @dev: network device
1188  *
1189  * Check if device has not been removed from system.
1190  */
1191 static inline int netif_device_present(struct net_device *dev)
1192 {
1193         return test_bit(__LINK_STATE_PRESENT, &dev->state);
1194 }
1195
1196 extern void netif_device_detach(struct net_device *dev);
1197
1198 extern void netif_device_attach(struct net_device *dev);
1199
1200 /*
1201  * Network interface message level settings
1202  */
1203 #define HAVE_NETIF_MSG 1
1204
1205 enum {
1206         NETIF_MSG_DRV           = 0x0001,
1207         NETIF_MSG_PROBE         = 0x0002,
1208         NETIF_MSG_LINK          = 0x0004,
1209         NETIF_MSG_TIMER         = 0x0008,
1210         NETIF_MSG_IFDOWN        = 0x0010,
1211         NETIF_MSG_IFUP          = 0x0020,
1212         NETIF_MSG_RX_ERR        = 0x0040,
1213         NETIF_MSG_TX_ERR        = 0x0080,
1214         NETIF_MSG_TX_QUEUED     = 0x0100,
1215         NETIF_MSG_INTR          = 0x0200,
1216         NETIF_MSG_TX_DONE       = 0x0400,
1217         NETIF_MSG_RX_STATUS     = 0x0800,
1218         NETIF_MSG_PKTDATA       = 0x1000,
1219         NETIF_MSG_HW            = 0x2000,
1220         NETIF_MSG_WOL           = 0x4000,
1221 };
1222
1223 #define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
1224 #define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
1225 #define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
1226 #define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
1227 #define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
1228 #define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
1229 #define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
1230 #define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
1231 #define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
1232 #define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
1233 #define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
1234 #define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
1235 #define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
1236 #define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
1237 #define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)
1238
1239 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
1240 {
1241         /* use default */
1242         if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
1243                 return default_msg_enable_bits;
1244         if (debug_value == 0)   /* no output */
1245                 return 0;
1246         /* set low N bits */
1247         return (1 << debug_value) - 1;
1248 }
1249
1250 /* Test if receive needs to be scheduled but only if up */
1251 static inline int netif_rx_schedule_prep(struct net_device *dev,
1252                                          struct napi_struct *napi)
1253 {
1254         return netif_running(dev) && napi_schedule_prep(napi);
1255 }
1256
1257 /* Add interface to tail of rx poll list. This assumes that _prep has
1258  * already been called and returned 1.
1259  */
1260 static inline void __netif_rx_schedule(struct net_device *dev,
1261                                        struct napi_struct *napi)
1262 {
1263         dev_hold(dev);
1264         __napi_schedule(napi);
1265 }
1266
1267 /* Try to reschedule poll. Called by irq handler. */
1268
1269 static inline void netif_rx_schedule(struct net_device *dev,
1270                                      struct napi_struct *napi)
1271 {
1272         if (netif_rx_schedule_prep(dev, napi))
1273                 __netif_rx_schedule(dev, napi);
1274 }
1275
1276 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().  */
1277 static inline int netif_rx_reschedule(struct net_device *dev,
1278                                       struct napi_struct *napi)
1279 {
1280         if (napi_schedule_prep(napi)) {
1281                 __netif_rx_schedule(dev, napi);
1282                 return 1;
1283         }
1284         return 0;
1285 }
1286
1287 /* same as netif_rx_complete, except that local_irq_save(flags)
1288  * has already been issued
1289  */
1290 static inline void __netif_rx_complete(struct net_device *dev,
1291                                        struct napi_struct *napi)
1292 {
1293         __napi_complete(napi);
1294         dev_put(dev);
1295 }
1296
1297 /* Remove interface from poll list: it must be in the poll list
1298  * on current cpu. This primitive is called by dev->poll(), when
1299  * it completes the work. The device cannot be out of poll list at this
1300  * moment, it is BUG().
1301  */
1302 static inline void netif_rx_complete(struct net_device *dev,
1303                                      struct napi_struct *napi)
1304 {
1305         unsigned long flags;
1306
1307         local_irq_save(flags);
1308         __netif_rx_complete(dev, napi);
1309         local_irq_restore(flags);
1310 }
1311
1312 /**
1313  *      netif_tx_lock - grab network device transmit lock
1314  *      @dev: network device
1315  *      @cpu: cpu number of lock owner
1316  *
1317  * Get network device transmit lock
1318  */
1319 static inline void __netif_tx_lock(struct net_device *dev, int cpu)
1320 {
1321         spin_lock(&dev->_xmit_lock);
1322         dev->xmit_lock_owner = cpu;
1323 }
1324
1325 static inline void netif_tx_lock(struct net_device *dev)
1326 {
1327         __netif_tx_lock(dev, smp_processor_id());
1328 }
1329
1330 static inline void netif_tx_lock_bh(struct net_device *dev)
1331 {
1332         spin_lock_bh(&dev->_xmit_lock);
1333         dev->xmit_lock_owner = smp_processor_id();
1334 }
1335
1336 static inline int netif_tx_trylock(struct net_device *dev)
1337 {
1338         int ok = spin_trylock(&dev->_xmit_lock);
1339         if (likely(ok))
1340                 dev->xmit_lock_owner = smp_processor_id();
1341         return ok;
1342 }
1343
1344 static inline void netif_tx_unlock(struct net_device *dev)
1345 {
1346         dev->xmit_lock_owner = -1;
1347         spin_unlock(&dev->_xmit_lock);
1348 }
1349
1350 static inline void netif_tx_unlock_bh(struct net_device *dev)
1351 {
1352         dev->xmit_lock_owner = -1;
1353         spin_unlock_bh(&dev->_xmit_lock);
1354 }
1355
1356 #define HARD_TX_LOCK(dev, cpu) {                        \
1357         if ((dev->features & NETIF_F_LLTX) == 0) {      \
1358                 __netif_tx_lock(dev, cpu);                      \
1359         }                                               \
1360 }
1361
1362 #define HARD_TX_UNLOCK(dev) {                           \
1363         if ((dev->features & NETIF_F_LLTX) == 0) {      \
1364                 netif_tx_unlock(dev);                   \
1365         }                                               \
1366 }
1367
1368 static inline void netif_tx_disable(struct net_device *dev)
1369 {
1370         netif_tx_lock_bh(dev);
1371         netif_stop_queue(dev);
1372         netif_tx_unlock_bh(dev);
1373 }
1374
1375 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
1376
1377 extern void             ether_setup(struct net_device *dev);
1378
1379 /* Support for loadable net-drivers */
1380 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
1381                                        void (*setup)(struct net_device *),
1382                                        unsigned int queue_count);
1383 #define alloc_netdev(sizeof_priv, name, setup) \
1384         alloc_netdev_mq(sizeof_priv, name, setup, 1)
1385 extern int              register_netdev(struct net_device *dev);
1386 extern void             unregister_netdev(struct net_device *dev);
1387 /* Functions used for secondary unicast and multicast support */
1388 extern void             dev_set_rx_mode(struct net_device *dev);
1389 extern void             __dev_set_rx_mode(struct net_device *dev);
1390 extern int              dev_unicast_delete(struct net_device *dev, void *addr, int alen);
1391 extern int              dev_unicast_add(struct net_device *dev, void *addr, int alen);
1392 extern int              dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
1393 extern int              dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
1394 extern int              dev_mc_sync(struct net_device *to, struct net_device *from);
1395 extern void             dev_mc_unsync(struct net_device *to, struct net_device *from);
1396 extern int              __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all);
1397 extern int              __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly);
1398 extern void             dev_set_promiscuity(struct net_device *dev, int inc);
1399 extern void             dev_set_allmulti(struct net_device *dev, int inc);
1400 extern void             netdev_state_change(struct net_device *dev);
1401 extern void             netdev_features_change(struct net_device *dev);
1402 /* Load a device via the kmod */
1403 extern void             dev_load(struct net *net, const char *name);
1404 extern void             dev_mcast_init(void);
1405 extern int              netdev_max_backlog;
1406 extern int              weight_p;
1407 extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
1408 extern int skb_checksum_help(struct sk_buff *skb);
1409 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
1410 #ifdef CONFIG_BUG
1411 extern void netdev_rx_csum_fault(struct net_device *dev);
1412 #else
1413 static inline void netdev_rx_csum_fault(struct net_device *dev)
1414 {
1415 }
1416 #endif
1417 /* rx skb timestamps */
1418 extern void             net_enable_timestamp(void);
1419 extern void             net_disable_timestamp(void);
1420
1421 #ifdef CONFIG_PROC_FS
1422 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
1423 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
1424 extern void dev_seq_stop(struct seq_file *seq, void *v);
1425 #endif
1426
1427 extern void linkwatch_run_queue(void);
1428
1429 extern int netdev_compute_features(unsigned long all, unsigned long one);
1430
1431 static inline int net_gso_ok(int features, int gso_type)
1432 {
1433         int feature = gso_type << NETIF_F_GSO_SHIFT;
1434         return (features & feature) == feature;
1435 }
1436
1437 static inline int skb_gso_ok(struct sk_buff *skb, int features)
1438 {
1439         return net_gso_ok(features, skb_shinfo(skb)->gso_type);
1440 }
1441
1442 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
1443 {
1444         return skb_is_gso(skb) &&
1445                (!skb_gso_ok(skb, dev->features) ||
1446                 unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
1447 }
1448
1449 /* On bonding slaves other than the currently active slave, suppress
1450  * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
1451  * ARP on active-backup slaves with arp_validate enabled.
1452  */
1453 static inline int skb_bond_should_drop(struct sk_buff *skb)
1454 {
1455         struct net_device *dev = skb->dev;
1456         struct net_device *master = dev->master;
1457
1458         if (master &&
1459             (dev->priv_flags & IFF_SLAVE_INACTIVE)) {
1460                 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
1461                     skb->protocol == __constant_htons(ETH_P_ARP))
1462                         return 0;
1463
1464                 if (master->priv_flags & IFF_MASTER_ALB) {
1465                         if (skb->pkt_type != PACKET_BROADCAST &&
1466                             skb->pkt_type != PACKET_MULTICAST)
1467                                 return 0;
1468                 }
1469                 if (master->priv_flags & IFF_MASTER_8023AD &&
1470                     skb->protocol == __constant_htons(ETH_P_SLOW))
1471                         return 0;
1472
1473                 return 1;
1474         }
1475         return 0;
1476 }
1477
1478 #endif /* __KERNEL__ */
1479
1480 #endif  /* _LINUX_DEV_H */