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15637ed4 RG |
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 | * | |
1cdffd64 RG |
38 | * from: @(#)pk_timer.c 7.5 (Berkeley) 5/29/91 |
39 | * $Id$ | |
15637ed4 RG |
40 | */ |
41 | ||
42 | #include "param.h" | |
43 | #include "systm.h" | |
44 | #include "mbuf.h" | |
45 | #include "socket.h" | |
46 | #include "protosw.h" | |
47 | #include "socketvar.h" | |
48 | #include "errno.h" | |
49 | ||
50 | #include "../net/if.h" | |
51 | ||
52 | #include "x25.h" | |
53 | #include "pk.h" | |
54 | #include "pk_var.h" | |
55 | ||
56 | /* | |
57 | * Various timer values. They can be adjusted | |
58 | * by patching the binary with adb if necessary. | |
59 | */ | |
60 | int pk_t20 = 18 * PR_SLOWHZ; /* restart timer */ | |
61 | int pk_t21 = 20 * PR_SLOWHZ; /* call timer */ | |
62 | /* XXX pk_t22 is never used */ | |
63 | int pk_t22 = 18 * PR_SLOWHZ; /* reset timer */ | |
64 | int pk_t23 = 18 * PR_SLOWHZ; /* clear timer */ | |
65 | ||
66 | pk_timer () | |
67 | { | |
68 | register struct pkcb *pkp; | |
69 | register struct pklcd *lcp, **pp; | |
70 | register int lcns_jammed, cant_restart; | |
71 | ||
72 | for (pkp = pkcbhead; pkp; pkp = pkp->pk_next) { | |
73 | switch (pkp -> pk_state) { | |
74 | case DTE_SENT_RESTART: | |
75 | lcp = pkp -> pk_chan[0]; | |
76 | /* | |
77 | * If restart failures are common, a link level | |
78 | * reset should be initiated here. | |
79 | */ | |
80 | if (lcp -> lcd_timer && --lcp -> lcd_timer == 0) | |
81 | pk_message (0, pkp -> pk_xcp, | |
82 | "packet level restart failed"); | |
83 | break; | |
84 | ||
85 | case DTE_READY: | |
86 | lcns_jammed = cant_restart = 0; | |
87 | for (pp = &pkp -> pk_chan[1]; pp <= &pkp -> pk_chan[pkp -> pk_maxlcn]; pp++) { | |
88 | if ((lcp = *pp) == 0) | |
89 | continue; | |
90 | switch (lcp -> lcd_state) { | |
91 | case SENT_CALL: | |
92 | if (--lcp -> lcd_timer == 0) { | |
93 | if (lcp -> lcd_so) | |
94 | lcp -> lcd_so -> so_error = ETIMEDOUT; | |
95 | pk_clear (lcp, 49, 1); | |
96 | } | |
97 | break; | |
98 | ||
99 | case SENT_CLEAR: | |
100 | if (lcp -> lcd_retry >= 3) | |
101 | lcns_jammed++; | |
102 | else | |
103 | if (--lcp -> lcd_timer == 0) | |
104 | pk_clear (lcp, 50, 1); | |
105 | break; | |
106 | ||
107 | case DATA_TRANSFER: /* lcn active */ | |
108 | cant_restart++; | |
109 | break; | |
110 | } | |
111 | } | |
112 | if (lcns_jammed > pkp -> pk_maxlcn / 2 && cant_restart == 0) { | |
113 | pk_message (0, pkp -> pk_xcp, "%d lcns jammed: attempting restart", lcns_jammed); | |
114 | pk_restart (pkp, 0); | |
115 | } | |
116 | } | |
117 | } | |
118 | } |