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1.1 root 1: /*
2: * Copyright (c) University of British Columbia, 1984
3: * Copyright (c) 1990 The Regents of the University of California.
4: * All rights reserved.
5: *
6: * This code is derived from software contributed to Berkeley by
7: * the Laboratory for Computation Vision and the Computer Science Department
8: * of the University of British Columbia.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by the University of
21: * California, Berkeley and its contributors.
22: * 4. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: *
38: * @(#)pk_timer.c 7.5 (Berkeley) 5/29/91
39: */
40:
41: #include "param.h"
42: #include "systm.h"
43: #include "mbuf.h"
44: #include "socket.h"
45: #include "protosw.h"
46: #include "socketvar.h"
47: #include "errno.h"
48:
49: #include "../net/if.h"
50:
51: #include "x25.h"
52: #include "pk.h"
53: #include "pk_var.h"
54:
55: /*
56: * Various timer values. They can be adjusted
57: * by patching the binary with adb if necessary.
58: */
59: int pk_t20 = 18 * PR_SLOWHZ; /* restart timer */
60: int pk_t21 = 20 * PR_SLOWHZ; /* call timer */
61: /* XXX pk_t22 is never used */
62: int pk_t22 = 18 * PR_SLOWHZ; /* reset timer */
63: int pk_t23 = 18 * PR_SLOWHZ; /* clear timer */
64:
65: pk_timer ()
66: {
67: register struct pkcb *pkp;
68: register struct pklcd *lcp, **pp;
69: register int lcns_jammed, cant_restart;
70:
71: for (pkp = pkcbhead; pkp; pkp = pkp->pk_next) {
72: switch (pkp -> pk_state) {
73: case DTE_SENT_RESTART:
74: lcp = pkp -> pk_chan[0];
75: /*
76: * If restart failures are common, a link level
77: * reset should be initiated here.
78: */
79: if (lcp -> lcd_timer && --lcp -> lcd_timer == 0)
80: pk_message (0, pkp -> pk_xcp,
81: "packet level restart failed");
82: break;
83:
84: case DTE_READY:
85: lcns_jammed = cant_restart = 0;
86: for (pp = &pkp -> pk_chan[1]; pp <= &pkp -> pk_chan[pkp -> pk_maxlcn]; pp++) {
87: if ((lcp = *pp) == 0)
88: continue;
89: switch (lcp -> lcd_state) {
90: case SENT_CALL:
91: if (--lcp -> lcd_timer == 0) {
92: if (lcp -> lcd_so)
93: lcp -> lcd_so -> so_error = ETIMEDOUT;
94: pk_clear (lcp, 49, 1);
95: }
96: break;
97:
98: case SENT_CLEAR:
99: if (lcp -> lcd_retry >= 3)
100: lcns_jammed++;
101: else
102: if (--lcp -> lcd_timer == 0)
103: pk_clear (lcp, 50, 1);
104: break;
105:
106: case DATA_TRANSFER: /* lcn active */
107: cant_restart++;
108: break;
109: }
110: }
111: if (lcns_jammed > pkp -> pk_maxlcn / 2 && cant_restart == 0) {
112: pk_message (0, pkp -> pk_xcp, "%d lcns jammed: attempting restart", lcns_jammed);
113: pk_restart (pkp, 0);
114: }
115: }
116: }
117: }
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