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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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