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1.1 root 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: }
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