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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: *
1.1.1.2 ! root 38: * from: @(#)hd_timer.c 7.4 (Berkeley) 5/29/91
! 39: * hd_timer.c,v 1.2 1993/05/20 04:12:09 cgd Exp
1.1 root 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:
74: hd_timer ()
75: {
76: register struct hdcb *hdp;
77: register int s = splimp ();
78:
79: for (hdp = hdcbhead; hdp; hdp = hdp->hd_next) {
80: if (hdp->hd_rrtimer && (--hdp->hd_rrtimer == 0)) {
81: if (hdp->hd_lasttxnr != hdp->hd_vr)
82: hd_writeinternal (hdp, RR, POLLOFF);
83: }
84:
85: if (!(hdp->hd_timer && --hdp->hd_timer == 0))
86: continue;
87:
88: switch (hdp->hd_state) {
89: case INIT:
90: case DISC_SENT:
91: hd_writeinternal (hdp, DISC, POLLON);
92: break;
93:
94: case ABM:
95: if (hdp->hd_lastrxnr != hdp->hd_vs) { /* XXX */
96: hdp->hd_timeouts++;
97: hd_resend_iframe (hdp);
98: }
99: break;
100:
101: case WAIT_SABM:
102: hd_writeinternal (hdp, FRMR, POLLOFF);
103: if (++hdp->hd_retxcnt == hd_n2) {
104: hdp->hd_retxcnt = 0;
105: hd_writeinternal (hdp, SABM, POLLOFF);
106: hdp->hd_state = WAIT_UA;
107: }
108: break;
109:
110: case DM_SENT:
111: if (++hdp->hd_retxcnt == hd_n2) {
112: /* Notify the packet level. */
113: (void) pk_ctlinput (PRC_LINKDOWN, hdp->hd_pkp);
114: hdp->hd_retxcnt = 0;
115: hdp->hd_state = SABM_SENT;
116: hd_writeinternal (hdp, SABM, POLLOFF);
117: } else
118: hd_writeinternal (hdp, DM, POLLOFF);
119: break;
120:
121: case WAIT_UA:
122: if (++hdp->hd_retxcnt == hd_n2) {
123: hdp->hd_retxcnt = 0;
124: hd_writeinternal (hdp, DM, POLLOFF);
125: hdp->hd_state = DM_SENT;
126: } else
127: hd_writeinternal (hdp, SABM, POLLOFF);
128: break;
129:
130: case SABM_SENT:
131: /* Do this indefinitely. */
132: hd_writeinternal (hdp, SABM, POLLON);
133: break;
134:
135: case DISCONNECTED:
136: /*
137: * Poll the interface driver flags waiting
138: * for the IFF_UP bit to come on.
139: */
140: if (hdp->hd_ifp->if_flags & IFF_UP)
141: hdp->hd_state = INIT;
142:
143: }
144: SET_TIMER (hdp);
145: }
146:
147: splx (s);
148: }
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