bsd/netccitt/pk_timer.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) Computing Centre, University of British Columbia, 1984
  24  * Copyright (C) Computer Science Department IV,
  25  *               University of Erlangen-Nuremberg, Germany, 1990, 1992
  26  * Copyright (c) 1990, 1992, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * This code is derived from software contributed to Berkeley by the
  30  * Laboratory for Computation Vision and the Computer Science Department
  31  * of the the University of British Columbia and the Computer Science
  32  * Department (IV) of the University of Erlangen-Nuremberg, Germany.
  33  *
  34  * Redistribution and use in source and binary forms, with or without
  35  * modification, are permitted provided that the following conditions
  36  * are met:
  37  * 1. Redistributions of source code must retain the above copyright
  38  *    notice, this list of conditions and the following disclaimer.
  39  * 2. Redistributions in binary form must reproduce the above copyright
  40  *    notice, this list of conditions and the following disclaimer in the
  41  *    documentation and/or other materials provided with the distribution.
  42  * 3. All advertising materials mentioning features or use of this software
  43  *    must display the following acknowledgement:
  44  *      This product includes software developed by the University of
  45  *      California, Berkeley and its contributors.
  46  * 4. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  *
  62  *      @(#)pk_timer.c  8.1 (Berkeley) 6/10/93
  63  */
  64
  65 #include <sys/param.h>
  66 #include <sys/systm.h>
  67 #include <sys/mbuf.h>
  68 #include <sys/socket.h>
  69 #include <sys/protosw.h>
  70 #include <sys/socketvar.h>
  71 #include <sys/errno.h>
  72
  73 #include <net/if.h>
  74
  75 #include <netccitt/x25.h>
  76 #include <netccitt/pk.h>
  77 #include <netccitt/pk_var.h>
  78
  79 /*
  80  * Various timer values.  They can be adjusted
  81  * by patching the binary with adb if necessary.
  82  */
  83 int     pk_t20 = 18 * PR_SLOWHZ;        /* restart timer */
  84 int     pk_t21 = 20 * PR_SLOWHZ;        /* call timer */
  85 /* XXX pk_t22 is never used */
  86 int     pk_t22 = 18 * PR_SLOWHZ;        /* reset timer */
  87 int     pk_t23 = 18 * PR_SLOWHZ;        /* clear timer */
  88
  89 pk_timer ()
  90 {
  91         register struct pkcb *pkp;
  92         register struct pklcd *lcp, **pp;
  93         register int lcns_jammed, cant_restart;
  94
  95         FOR_ALL_PKCBS(pkp) {
  96                 switch (pkp -> pk_state) {
  97                 case DTE_SENT_RESTART:
  98                         lcp = pkp -> pk_chan[0];
  99                         /*
 100                          * If restart failures are common, a link level
 101                          * reset should be initiated here.
 102                          */
 103                         if (lcp -> lcd_timer && --lcp -> lcd_timer == 0) {
 104                                 pk_message (0, pkp -> pk_xcp,
 105                                         "packet level restart failed");
 106                                 pkp -> pk_state = DTE_WAITING;
 107                         }
 108                         break;
 109
 110                 case DTE_READY:
 111                         lcns_jammed = cant_restart = 0;
 112                         for (pp = &pkp -> pk_chan[1]; pp <= &pkp -> pk_chan[pkp -> pk_maxlcn]; pp++) {
 113                                 if ((lcp = *pp) == 0)
 114                                         continue;
 115                                 switch (lcp -> lcd_state) {
 116                                 case SENT_CALL:
 117                                         if (--lcp -> lcd_timer == 0) {
 118                                             if (lcp -> lcd_so)
 119                                                 lcp -> lcd_so -> so_error = ETIMEDOUT;
 120                                             pk_clear (lcp, 49, 1);
 121                                         }
 122                                         break;
 123
 124                                 case SENT_CLEAR:
 125                                         if (lcp -> lcd_retry >= 3)
 126                                                 lcns_jammed++;
 127                                         else
 128                                                 if (--lcp -> lcd_timer == 0)
 129                                                         pk_clear (lcp, 50, 1);
 130                                         break;
 131
 132                                 case DATA_TRANSFER:     /* lcn active */
 133                                         cant_restart++;
 134                                         break;
 135
 136                                 case LCN_ZOMBIE:       /* zombie state */
 137                                         pk_freelcd (lcp);
 138                                         break;
 139                                 }
 140                         }
 141                         if (lcns_jammed > pkp -> pk_maxlcn / 2 && cant_restart == 0) {
 142                                 pk_message (0, pkp -> pk_xcp, "%d lcns jammed: attempting restart", lcns_jammed);
 143                                 pk_restart (pkp, 0);
 144                         }
 145                 }
 146         }
 147 }