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- /*
- * Copyright (c) University of British Columbia, 1984
- * Copyright (c) 1990 The Regents of the University of California.
- * All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * the Laboratory for Computation Vision and the Computer Science Department
- * of the University of British Columbia.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)pk_timer.c 7.5 (Berkeley) 5/29/91
- */
-
- #include "param.h"
- #include "systm.h"
- #include "mbuf.h"
- #include "socket.h"
- #include "protosw.h"
- #include "socketvar.h"
- #include "errno.h"
-
- #include "../net/if.h"
-
- #include "x25.h"
- #include "pk.h"
- #include "pk_var.h"
-
- /*
- * Various timer values. They can be adjusted
- * by patching the binary with adb if necessary.
- */
- int pk_t20 = 18 * PR_SLOWHZ; /* restart timer */
- int pk_t21 = 20 * PR_SLOWHZ; /* call timer */
- /* XXX pk_t22 is never used */
- int pk_t22 = 18 * PR_SLOWHZ; /* reset timer */
- int pk_t23 = 18 * PR_SLOWHZ; /* clear timer */
-
- pk_timer ()
- {
- register struct pkcb *pkp;
- register struct pklcd *lcp, **pp;
- register int lcns_jammed, cant_restart;
-
- for (pkp = pkcbhead; pkp; pkp = pkp->pk_next) {
- switch (pkp -> pk_state) {
- case DTE_SENT_RESTART:
- lcp = pkp -> pk_chan[0];
- /*
- * If restart failures are common, a link level
- * reset should be initiated here.
- */
- if (lcp -> lcd_timer && --lcp -> lcd_timer == 0)
- pk_message (0, pkp -> pk_xcp,
- "packet level restart failed");
- break;
-
- case DTE_READY:
- lcns_jammed = cant_restart = 0;
- for (pp = &pkp -> pk_chan[1]; pp <= &pkp -> pk_chan[pkp -> pk_maxlcn]; pp++) {
- if ((lcp = *pp) == 0)
- continue;
- switch (lcp -> lcd_state) {
- case SENT_CALL:
- if (--lcp -> lcd_timer == 0) {
- if (lcp -> lcd_so)
- lcp -> lcd_so -> so_error = ETIMEDOUT;
- pk_clear (lcp, 49, 1);
- }
- break;
-
- case SENT_CLEAR:
- if (lcp -> lcd_retry >= 3)
- lcns_jammed++;
- else
- if (--lcp -> lcd_timer == 0)
- pk_clear (lcp, 50, 1);
- break;
-
- case DATA_TRANSFER: /* lcn active */
- cant_restart++;
- break;
- }
- }
- if (lcns_jammed > pkp -> pk_maxlcn / 2 && cant_restart == 0) {
- pk_message (0, pkp -> pk_xcp, "%d lcns jammed: attempting restart", lcns_jammed);
- pk_restart (pkp, 0);
- }
- }
- }
- }
-