[unix-history] / sys / netccitt / hd_timer.c

/*
 * Copyright (c) University of British Columbia, 1984
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Laboratory for Computation Vision and the Computer Science Department
 * of the University of British Columbia.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	from: @(#)hd_timer.c	7.4 (Berkeley) 5/29/91
 *	$Id$
 */

#include "param.h"
#include "systm.h"
#include "mbuf.h"
#include "domain.h"
#include "socket.h"
#include "protosw.h"
#include "errno.h"
#include "time.h"
#include "kernel.h"

#include "../net/if.h"

#include "hdlc.h"
#include "hd_var.h"
#include "x25.h"

/*
 * these can be patched with adb if the
 * default values are inappropriate
 */

int	hd_t1 = T1;
int	hd_t3 = T3;
int	hd_n2 = N2;

/*
 *  HDLC TIMER 
 *
 *  This routine is called every 500ms by the kernel. Decrement timer by this
 *  amount - if expired then process the event.
 */

hd_timer ()
{
	register struct hdcb *hdp;
	register int s = splimp ();

	for (hdp = hdcbhead; hdp; hdp = hdp->hd_next) {
		if (hdp->hd_rrtimer && (--hdp->hd_rrtimer == 0)) {
			if (hdp->hd_lasttxnr != hdp->hd_vr)
				hd_writeinternal (hdp, RR, POLLOFF);
		}

		if (!(hdp->hd_timer && --hdp->hd_timer == 0))
			continue;

		switch (hdp->hd_state) {
		case INIT: 
		case DISC_SENT:
			hd_writeinternal (hdp, DISC, POLLON);
			break;

		case ABM: 
			if (hdp->hd_lastrxnr != hdp->hd_vs) {	/* XXX */
				hdp->hd_timeouts++;
				hd_resend_iframe (hdp);
			}
			break;

		case WAIT_SABM: 
			hd_writeinternal (hdp, FRMR, POLLOFF);
			if (++hdp->hd_retxcnt == hd_n2) {
				hdp->hd_retxcnt = 0;
				hd_writeinternal (hdp, SABM, POLLOFF);
				hdp->hd_state = WAIT_UA;
			}
			break;

		case DM_SENT: 
			if (++hdp->hd_retxcnt == hd_n2) {
				/* Notify the packet level. */
				(void) pk_ctlinput (PRC_LINKDOWN, hdp->hd_pkp);
				hdp->hd_retxcnt = 0;
				hdp->hd_state = SABM_SENT;
				hd_writeinternal (hdp, SABM, POLLOFF);
			} else
				hd_writeinternal (hdp, DM, POLLOFF);
			break;

		case WAIT_UA: 
			if (++hdp->hd_retxcnt == hd_n2) {
				hdp->hd_retxcnt = 0;
				hd_writeinternal (hdp, DM, POLLOFF);
				hdp->hd_state = DM_SENT;
			} else
				hd_writeinternal (hdp, SABM, POLLOFF);
			break;

		case SABM_SENT: 
			/* Do this indefinitely. */
			hd_writeinternal (hdp, SABM, POLLON);
			break;

		case DISCONNECTED:
			/*
			 * Poll the interface driver flags waiting
			 * for the IFF_UP bit to come on.
			 */
			if (hdp->hd_ifp->if_flags & IFF_UP)
				hdp->hd_state = INIT;

		}
		SET_TIMER (hdp);
	}

	splx (s);
}
Commit	Line	Data
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: @(#)hd_timer.c 7.4 (Berkeley) 5/29/91
1cdffd64 RG	39	* $Id$
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
	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	}