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Annotation of Gnu-Mach/device/if_hdr.h, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Mach Operating System
        !             3:  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
        !             4:  * All Rights Reserved.
        !             5:  * 
        !             6:  * Permission to use, copy, modify and distribute this software and its
        !             7:  * documentation is hereby granted, provided that both the copyright
        !             8:  * notice and this permission notice appear in all copies of the
        !             9:  * software, derivative works or modified versions, and any portions
        !            10:  * thereof, and that both notices appear in supporting documentation.
        !            11:  * 
        !            12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            15:  * 
        !            16:  * Carnegie Mellon requests users of this software to return to
        !            17:  * 
        !            18:  *  Software Distribution Coordinator  or  [email protected]
        !            19:  *  School of Computer Science
        !            20:  *  Carnegie Mellon University
        !            21:  *  Pittsburgh PA 15213-3890
        !            22:  * 
        !            23:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            24:  * the rights to redistribute these changes.
        !            25:  */
        !            26: /*
        !            27:  *     Taken from (bsd)net/if.h.  Modified for MACH kernel.
        !            28:  */
        !            29: /*
        !            30:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !            31:  * All rights reserved.
        !            32:  *
        !            33:  * Redistribution and use in source and binary forms are permitted
        !            34:  * provided that the above copyright notice and this paragraph are
        !            35:  * duplicated in all such forms and that any documentation,
        !            36:  * advertising materials, and other materials related to such
        !            37:  * distribution and use acknowledge that the software was developed
        !            38:  * by the University of California, Berkeley.  The name of the
        !            39:  * University may not be used to endorse or promote products derived
        !            40:  * from this software without specific prior written permission.
        !            41:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            42:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            43:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            44:  *
        !            45:  *     @(#)if.h        7.3 (Berkeley) 6/27/88
        !            46:  */
        !            47: 
        !            48: #ifndef        _IF_HDR_
        !            49: #define        _IF_HDR_
        !            50: 
        !            51: #include <kern/lock.h>
        !            52: #include <kern/queue.h>
        !            53: 
        !            54: /*
        !            55:  * Queue for network output and filter input.
        !            56:  */
        !            57: struct ifqueue {
        !            58:        queue_head_t    ifq_head;       /* queue of io_req_t */
        !            59:        int             ifq_len;        /* length of queue */
        !            60:        int             ifq_maxlen;     /* maximum length of queue */
        !            61:        int             ifq_drops;      /* number of packets dropped
        !            62:                                           because queue full */
        !            63:        decl_simple_lock_data(,
        !            64:                        ifq_lock)       /* lock for queue and counters */
        !            65: };
        !            66: 
        !            67: /*
        !            68:  * Header for network interface drivers.
        !            69:  */
        !            70: struct ifnet {
        !            71:        short   if_unit;                /* unit number */
        !            72:        short   if_flags;               /* up/down, broadcast, etc. */
        !            73:        short   if_timer;               /* time until if_watchdog called */
        !            74:        short   if_mtu;                 /* maximum transmission unit */
        !            75:        short   if_header_size;         /* length of header */
        !            76:        short   if_header_format;       /* format of hardware header */
        !            77:        short   if_address_size;        /* length of hardware address */
        !            78:        short   if_alloc_size;          /* size of read buffer to allocate */
        !            79:        char    *if_address;            /* pointer to hardware address */
        !            80:        struct ifqueue if_snd;          /* output queue */
        !            81:        queue_head_t if_rcv_port_list;  /* input filter list */
        !            82:        decl_simple_lock_data(,
        !            83:                if_rcv_port_list_lock)  /* lock for filter list */
        !            84: /* statistics */
        !            85:        int     if_ipackets;            /* packets received */
        !            86:        int     if_ierrors;             /* input errors */
        !            87:        int     if_opackets;            /* packets sent */
        !            88:        int     if_oerrors;             /* output errors */
        !            89:        int     if_collisions;          /* collisions on csma interfaces */
        !            90:        int     if_rcvdrops;            /* packets received but dropped */
        !            91: };
        !            92: 
        !            93: #define        IFF_UP          0x0001          /* interface is up */
        !            94: #define        IFF_BROADCAST   0x0002          /* interface can broadcast */
        !            95: #define        IFF_DEBUG       0x0004          /* turn on debugging */
        !            96: #define        IFF_LOOPBACK    0x0008          /* is a loopback net */
        !            97: #define        IFF_POINTOPOINT 0x0010          /* point-to-point link */
        !            98: #define        IFF_RUNNING     0x0040          /* resources allocated */
        !            99: #define        IFF_NOARP       0x0080          /* no address resolution protocol */
        !           100: #define        IFF_PROMISC     0x0100          /* receive all packets */
        !           101: #define        IFF_ALLMULTI    0x0200          /* receive all multicast packets */
        !           102: #define        IFF_BRIDGE      0x0100          /* support token ring routing field */
        !           103: #define        IFF_SNAP        0x0200          /* support extended sap header */
        !           104: 
        !           105: /* internal flags only: */
        !           106: #define        IFF_CANTCHANGE  (IFF_BROADCAST | IFF_POINTOPOINT | IFF_RUNNING)
        !           107: 
        !           108: /*
        !           109:  * Output queues (ifp->if_snd)
        !           110:  * have queues of messages stored on ifqueue structures.  Entries
        !           111:  * are added to and deleted from these structures by these macros, which
        !           112:  * should be called with ipl raised to splimp().
        !           113:  * XXX locking XXX
        !           114:  */
        !           115: 
        !           116: #define        IF_QFULL(ifq)           ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
        !           117: #define        IF_DROP(ifq)            ((ifq)->ifq_drops++)
        !           118: #define        IF_ENQUEUE(ifq, ior) { \
        !           119:        simple_lock(&(ifq)->ifq_lock); \
        !           120:        enqueue_tail(&(ifq)->ifq_head, (queue_entry_t)ior); \
        !           121:        (ifq)->ifq_len++; \
        !           122:        simple_unlock(&(ifq)->ifq_lock); \
        !           123: }
        !           124: #define        IF_PREPEND(ifq, ior) { \
        !           125:        simple_lock(&(ifq)->ifq_lock); \
        !           126:        enqueue_head(&(ifq)->ifq_head, (queue_entry_t)ior); \
        !           127:        (ifq)->ifq_len++; \
        !           128:        simple_unlock(&(ifq)->ifq_lock); \
        !           129: }
        !           130: 
        !           131: #define        IF_DEQUEUE(ifq, ior) { \
        !           132:        simple_lock(&(ifq)->ifq_lock); \
        !           133:        if (((ior) = (io_req_t)dequeue_head(&(ifq)->ifq_head)) != 0) \
        !           134:            (ifq)->ifq_len--; \
        !           135:        simple_unlock(&(ifq)->ifq_lock); \
        !           136: }
        !           137: 
        !           138: #define        IFQ_MAXLEN      50
        !           139: 
        !           140: #define        IFQ_INIT(ifq) { \
        !           141:        queue_init(&(ifq)->ifq_head); \
        !           142:        simple_lock_init(&(ifq)->ifq_lock); \
        !           143:        (ifq)->ifq_len = 0; \
        !           144:        (ifq)->ifq_maxlen = IFQ_MAXLEN; \
        !           145:        (ifq)->ifq_drops = 0; \
        !           146: }
        !           147: 
        !           148: #define        IFNET_SLOWHZ    1               /* granularity is 1 second */
        !           149: 
        !           150: #endif _IF_HDR_

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