128 lines
4.3 KiB
C
128 lines
4.3 KiB
C
/*
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* Copyright (c) Computing Centre, University of British Columbia, 1984
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* Copyright (C) Computer Science Department IV,
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* University of Erlangen-Nuremberg, Germany, 1990, 1992
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* Copyright (c) 1990, 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by the
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* Laboratory for Computation Vision and the Computer Science Department
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* of the the University of British Columbia and the Computer Science
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* Department (IV) of the University of Erlangen-Nuremberg, Germany.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)pk_timer.c 8.1 (Berkeley) 6/10/93
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* $Id: pk_timer.c,v 1.2 1994/08/02 07:47:44 davidg Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/protosw.h>
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#include <sys/socketvar.h>
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#include <sys/errno.h>
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#include <net/if.h>
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#include <netccitt/x25.h>
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#include <netccitt/pk.h>
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#include <netccitt/pk_var.h>
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/*
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* Various timer values. They can be adjusted
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* by patching the binary with adb if necessary.
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*/
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int pk_t20 = 18 * PR_SLOWHZ; /* restart timer */
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int pk_t21 = 20 * PR_SLOWHZ; /* call timer */
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/* XXX pk_t22 is never used */
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int pk_t22 = 18 * PR_SLOWHZ; /* reset timer */
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int pk_t23 = 18 * PR_SLOWHZ; /* clear timer */
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pk_timer ()
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{
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register struct pkcb *pkp;
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register struct pklcd *lcp, **pp;
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register int lcns_jammed, cant_restart;
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FOR_ALL_PKCBS(pkp) {
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switch (pkp -> pk_state) {
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case DTE_SENT_RESTART:
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lcp = pkp -> pk_chan[0];
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/*
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* If restart failures are common, a link level
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* reset should be initiated here.
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*/
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if (lcp -> lcd_timer && --lcp -> lcd_timer == 0) {
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pk_message (0, pkp -> pk_xcp,
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"packet level restart failed");
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pkp -> pk_state = DTE_WAITING;
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}
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break;
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case DTE_READY:
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lcns_jammed = cant_restart = 0;
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for (pp = &pkp -> pk_chan[1]; pp <= &pkp -> pk_chan[pkp -> pk_maxlcn]; pp++) {
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if ((lcp = *pp) == 0)
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continue;
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switch (lcp -> lcd_state) {
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case SENT_CALL:
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if (--lcp -> lcd_timer == 0) {
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if (lcp -> lcd_so)
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lcp -> lcd_so -> so_error = ETIMEDOUT;
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pk_clear (lcp, 49, 1);
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}
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break;
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case SENT_CLEAR:
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if (lcp -> lcd_retry >= 3)
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lcns_jammed++;
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else
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if (--lcp -> lcd_timer == 0)
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pk_clear (lcp, 50, 1);
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break;
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case DATA_TRANSFER: /* lcn active */
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cant_restart++;
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break;
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case LCN_ZOMBIE: /* zombie state */
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pk_freelcd (lcp);
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break;
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}
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}
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if (lcns_jammed > pkp -> pk_maxlcn / 2 && cant_restart == 0) {
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pk_message (0, pkp -> pk_xcp, "%d lcns jammed: attempting restart", lcns_jammed);
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pk_restart (pkp, 0);
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}
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}
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}
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}
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