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Annotation of kernel/bsd/netat/h/at_ddp_brt.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: 
        !            26: /*
        !            27:  *     Copyright (c) 1988, 1989 Apple Computer, Inc. 
        !            28:  *
        !            29:  *     The information contained herein is subject to change without
        !            30:  *     notice and  should not be  construed as a commitment by Apple
        !            31:  *     Computer, Inc. Apple Computer, Inc. assumes no responsibility
        !            32:  *     for any errors that may appear.
        !            33:  *
        !            34:  *     Confidential and Proprietary to Apple Computer, Inc.
        !            35:  */
        !            36: 
        !            37: /* "@(#)at_ddp_brt.h: 2.0, 1.7; 10/4/93; Copyright 1988-89, Apple Computer, Inc." */
        !            38: 
        !            39: typedef struct {
        !            40:        int                     age_flag;
        !            41:        at_if_t                 *ifID;
        !            42:        union   {
        !            43:                struct  etalk_addr      addr1;
        !            44:                struct  atalk_addr      addr2;
        !            45:        } addrs;
        !            46:        at_net_al                       net;
        !            47: #define et_addr        addrs.addr1
        !            48: #define at_addr        addrs.addr2
        !            49: } ddp_brt_t;
        !            50: 
        !            51: #define BRT_SWEEP_INT          10
        !            52: #define        BRT_BSIZ                 4      /* bucket size */
        !            53: #define        BRT_NB                  16      /* number of buckets */
        !            54: #define        BRTSIZE                 (BRT_BSIZ * BRT_NB)
        !            55: 
        !            56: /* age_flag values */
        !            57: #define        BRT_EMPTY               0       /* the BRT entry is empty     */
        !            58:                                        /* (or aged out).             */
        !            59: #define        BRT_VALID               1       /* BRT entry contains valid   */
        !            60:                                        /* tuple                      */
        !            61: #define        BRT_GETTING_OLD         2       /* BRT entry is a candidate   */
        !            62:                                        /* for aging                  */
        !            63: 
        !            64: #define        BRT_HASH(a)   ((a) % BRT_NB)
        !            65: 
        !            66: #define        BRT_LOOK(brt, dst_net) {                                \
        !            67:        register n;                                             \
        !            68:        brt = &at_ddp_brt[BRT_HASH(dst_net) * BRT_BSIZ];        \
        !            69:        for (n = 0 ; ; brt++) {                                 \
        !            70:                if (brt->net == dst_net)                        \
        !            71:                        break;                                  \
        !            72:                if (++n >= BRT_BSIZ) {                          \
        !            73:                        brt = NULL;                             \
        !            74:                        break;                                  \
        !            75:                }                                               \
        !            76:        }                                                       \
        !            77:        }
        !            78: 
        !            79: #define        NEW_BRT(brt, net) {                                     \
        !            80:        register n;                                             \
        !            81:        brt = &at_ddp_brt[BRT_HASH(net) * BRT_BSIZ];            \
        !            82:        for (n = 0 ; ; brt++) {                                 \
        !            83:                if (brt->age_flag == BRT_EMPTY)                 \
        !            84:                        break;                                  \
        !            85:                if (++n >= BRT_BSIZ) {                          \
        !            86:                        brt = NULL;                             \
        !            87:                        break;                                  \
        !            88:                }                                               \
        !            89:         }                                                       \
        !            90:        }
        !            91: 
        !            92: /* Best Router Cache */
        !            93: extern ddp_brt_t       at_ddp_brt[BRTSIZE];
        !            94: 
        !            95: 

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