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Annotation of kernel/bsd/netccitt/pk_timer.c, 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:  * Copyright (c) Computing Centre, University of British Columbia, 1984
        !            27:  * Copyright (C) Computer Science Department IV, 
        !            28:  *              University of Erlangen-Nuremberg, Germany, 1990, 1992
        !            29:  * Copyright (c) 1990, 1992, 1993
        !            30:  *     The Regents of the University of California.  All rights reserved.
        !            31:  * 
        !            32:  * This code is derived from software contributed to Berkeley by the
        !            33:  * Laboratory for Computation Vision and the Computer Science Department
        !            34:  * of the the University of British Columbia and the Computer Science
        !            35:  * Department (IV) of the University of Erlangen-Nuremberg, Germany.
        !            36:  *
        !            37:  * Redistribution and use in source and binary forms, with or without
        !            38:  * modification, are permitted provided that the following conditions
        !            39:  * are met:
        !            40:  * 1. Redistributions of source code must retain the above copyright
        !            41:  *    notice, this list of conditions and the following disclaimer.
        !            42:  * 2. Redistributions in binary form must reproduce the above copyright
        !            43:  *    notice, this list of conditions and the following disclaimer in the
        !            44:  *    documentation and/or other materials provided with the distribution.
        !            45:  * 3. All advertising materials mentioning features or use of this software
        !            46:  *    must display the following acknowledgement:
        !            47:  *     This product includes software developed by the University of
        !            48:  *     California, Berkeley and its contributors.
        !            49:  * 4. Neither the name of the University nor the names of its contributors
        !            50:  *    may be used to endorse or promote products derived from this software
        !            51:  *    without specific prior written permission.
        !            52:  *
        !            53:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            54:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            55:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            56:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            57:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            58:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            59:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            60:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            61:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            62:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            63:  * SUCH DAMAGE.
        !            64:  *
        !            65:  *     @(#)pk_timer.c  8.1 (Berkeley) 6/10/93
        !            66:  */
        !            67: 
        !            68: #include <sys/param.h>
        !            69: #include <sys/systm.h>
        !            70: #include <sys/mbuf.h>
        !            71: #include <sys/socket.h>
        !            72: #include <sys/protosw.h>
        !            73: #include <sys/socketvar.h>
        !            74: #include <sys/errno.h>
        !            75: 
        !            76: #include <net/if.h>
        !            77: 
        !            78: #include <netccitt/x25.h>
        !            79: #include <netccitt/pk.h>
        !            80: #include <netccitt/pk_var.h>
        !            81: 
        !            82: /*
        !            83:  * Various timer values.  They can be adjusted
        !            84:  * by patching the binary with adb if necessary.
        !            85:  */
        !            86: int    pk_t20 = 18 * PR_SLOWHZ;        /* restart timer */
        !            87: int    pk_t21 = 20 * PR_SLOWHZ;        /* call timer */
        !            88: /* XXX pk_t22 is never used */
        !            89: int    pk_t22 = 18 * PR_SLOWHZ;        /* reset timer */
        !            90: int    pk_t23 = 18 * PR_SLOWHZ;        /* clear timer */
        !            91: 
        !            92: pk_timer ()
        !            93: {
        !            94:        register struct pkcb *pkp;
        !            95:        register struct pklcd *lcp, **pp;
        !            96:        register int lcns_jammed, cant_restart;
        !            97: 
        !            98:        FOR_ALL_PKCBS(pkp) {
        !            99:                switch (pkp -> pk_state) {
        !           100:                case DTE_SENT_RESTART:
        !           101:                        lcp = pkp -> pk_chan[0];
        !           102:                        /*
        !           103:                         * If restart failures are common, a link level
        !           104:                         * reset should be initiated here.
        !           105:                         */
        !           106:                        if (lcp -> lcd_timer && --lcp -> lcd_timer == 0) {
        !           107:                                pk_message (0, pkp -> pk_xcp,
        !           108:                                        "packet level restart failed");
        !           109:                                pkp -> pk_state = DTE_WAITING;
        !           110:                        }
        !           111:                        break;
        !           112: 
        !           113:                case DTE_READY:
        !           114:                        lcns_jammed = cant_restart = 0;
        !           115:                        for (pp = &pkp -> pk_chan[1]; pp <= &pkp -> pk_chan[pkp -> pk_maxlcn]; pp++) {
        !           116:                                if ((lcp = *pp) == 0)
        !           117:                                        continue;
        !           118:                                switch (lcp -> lcd_state) {
        !           119:                                case SENT_CALL: 
        !           120:                                        if (--lcp -> lcd_timer == 0) {
        !           121:                                            if (lcp -> lcd_so)
        !           122:                                                lcp -> lcd_so -> so_error = ETIMEDOUT;
        !           123:                                            pk_clear (lcp, 49, 1);
        !           124:                                        }
        !           125:                                        break;
        !           126: 
        !           127:                                case SENT_CLEAR: 
        !           128:                                        if (lcp -> lcd_retry >= 3)
        !           129:                                                lcns_jammed++;
        !           130:                                        else
        !           131:                                                if (--lcp -> lcd_timer == 0)
        !           132:                                                        pk_clear (lcp, 50, 1);
        !           133:                                        break;
        !           134: 
        !           135:                                case DATA_TRANSFER:     /* lcn active */
        !           136:                                        cant_restart++;
        !           137:                                        break;
        !           138: 
        !           139:                                case LCN_ZOMBIE:       /* zombie state */
        !           140:                                        pk_freelcd (lcp);
        !           141:                                        break;
        !           142:                                }
        !           143:                        }
        !           144:                        if (lcns_jammed > pkp -> pk_maxlcn / 2 && cant_restart == 0) {
        !           145:                                pk_message (0, pkp -> pk_xcp, "%d lcns jammed: attempting restart", lcns_jammed);
        !           146:                                pk_restart (pkp, 0);
        !           147:                        }
        !           148:                }
        !           149:        }
        !           150: }

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