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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 | 38 | * from: @(#)hd_timer.c 7.4 (Berkeley) 5/29/91 |
4c45483e | 39 | * $Id: hd_timer.c,v 1.2 1993/10/16 19:46:40 rgrimes Exp $ |
15637ed4 RG |
40 | */ |
41 | ||
42 | #include "param.h" | |
43 | #include "systm.h" | |
44 | #include "mbuf.h" | |
45 | #include "domain.h" | |
46 | #include "socket.h" | |
47 | #include "protosw.h" | |
48 | #include "errno.h" | |
49 | #include "time.h" | |
50 | #include "kernel.h" | |
51 | ||
52 | #include "../net/if.h" | |
53 | ||
54 | #include "hdlc.h" | |
55 | #include "hd_var.h" | |
56 | #include "x25.h" | |
57 | ||
58 | /* | |
59 | * these can be patched with adb if the | |
60 | * default values are inappropriate | |
61 | */ | |
62 | ||
63 | int hd_t1 = T1; | |
64 | int hd_t3 = T3; | |
65 | int hd_n2 = N2; | |
66 | ||
67 | /* | |
68 | * HDLC TIMER | |
69 | * | |
70 | * This routine is called every 500ms by the kernel. Decrement timer by this | |
71 | * amount - if expired then process the event. | |
72 | */ | |
73 | ||
4c45483e | 74 | void |
15637ed4 RG |
75 | hd_timer () |
76 | { | |
77 | register struct hdcb *hdp; | |
78 | register int s = splimp (); | |
79 | ||
80 | for (hdp = hdcbhead; hdp; hdp = hdp->hd_next) { | |
81 | if (hdp->hd_rrtimer && (--hdp->hd_rrtimer == 0)) { | |
82 | if (hdp->hd_lasttxnr != hdp->hd_vr) | |
83 | hd_writeinternal (hdp, RR, POLLOFF); | |
84 | } | |
85 | ||
86 | if (!(hdp->hd_timer && --hdp->hd_timer == 0)) | |
87 | continue; | |
88 | ||
89 | switch (hdp->hd_state) { | |
90 | case INIT: | |
91 | case DISC_SENT: | |
92 | hd_writeinternal (hdp, DISC, POLLON); | |
93 | break; | |
94 | ||
95 | case ABM: | |
96 | if (hdp->hd_lastrxnr != hdp->hd_vs) { /* XXX */ | |
97 | hdp->hd_timeouts++; | |
98 | hd_resend_iframe (hdp); | |
99 | } | |
100 | break; | |
101 | ||
102 | case WAIT_SABM: | |
103 | hd_writeinternal (hdp, FRMR, POLLOFF); | |
104 | if (++hdp->hd_retxcnt == hd_n2) { | |
105 | hdp->hd_retxcnt = 0; | |
106 | hd_writeinternal (hdp, SABM, POLLOFF); | |
107 | hdp->hd_state = WAIT_UA; | |
108 | } | |
109 | break; | |
110 | ||
111 | case DM_SENT: | |
112 | if (++hdp->hd_retxcnt == hd_n2) { | |
113 | /* Notify the packet level. */ | |
114 | (void) pk_ctlinput (PRC_LINKDOWN, hdp->hd_pkp); | |
115 | hdp->hd_retxcnt = 0; | |
116 | hdp->hd_state = SABM_SENT; | |
117 | hd_writeinternal (hdp, SABM, POLLOFF); | |
118 | } else | |
119 | hd_writeinternal (hdp, DM, POLLOFF); | |
120 | break; | |
121 | ||
122 | case WAIT_UA: | |
123 | if (++hdp->hd_retxcnt == hd_n2) { | |
124 | hdp->hd_retxcnt = 0; | |
125 | hd_writeinternal (hdp, DM, POLLOFF); | |
126 | hdp->hd_state = DM_SENT; | |
127 | } else | |
128 | hd_writeinternal (hdp, SABM, POLLOFF); | |
129 | break; | |
130 | ||
131 | case SABM_SENT: | |
132 | /* Do this indefinitely. */ | |
133 | hd_writeinternal (hdp, SABM, POLLON); | |
134 | break; | |
135 | ||
136 | case DISCONNECTED: | |
137 | /* | |
138 | * Poll the interface driver flags waiting | |
139 | * for the IFF_UP bit to come on. | |
140 | */ | |
141 | if (hdp->hd_ifp->if_flags & IFF_UP) | |
142 | hdp->hd_state = INIT; | |
143 | ||
144 | } | |
145 | SET_TIMER (hdp); | |
146 | } | |
147 | ||
148 | splx (s); | |
149 | } |