223 lines
7.3 KiB
C
223 lines
7.3 KiB
C
/* $NetBSD: llc_timer.c,v 1.9 2005/02/26 22:45:10 perry Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Dirk Husemann and the Computer Science Department (IV) of
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* the University of Erlangen-Nuremberg, Germany.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)llc_timer.c 8.1 (Berkeley) 6/10/93
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*/
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/*
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* Copyright (c) 1990, 1991, 1992
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* Dirk Husemann, Computer Science Department IV,
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* University of Erlangen-Nuremberg, Germany.
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*
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* This code is derived from software contributed to Berkeley by
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* Dirk Husemann and the Computer Science Department (IV) of
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* the University of Erlangen-Nuremberg, Germany.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)llc_timer.c 8.1 (Berkeley) 6/10/93
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: llc_timer.c,v 1.9 2005/02/26 22:45:10 perry Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/domain.h>
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#include <sys/socket.h>
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#include <sys/protosw.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_llc.h>
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#include <netccitt/dll.h>
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#include <netccitt/llc_var.h>
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/*
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* Various timer values. They can be adjusted
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* by patching the binary with adb if necessary.
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*/
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/* ISO 8802-2 timers */
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int llc_n2 = LLC_N2_VALUE;
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int llc_ACK_timer = LLC_ACK_TIMER;
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int llc_P_timer = LLC_P_TIMER;
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int llc_BUSY_timer = LLC_BUSY_TIMER;
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int llc_REJ_timer = LLC_REJ_TIMER;
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/* Implementation specific timers */
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int llc_AGE_timer = LLC_AGE_TIMER;
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int llc_DACTION_timer = LLC_DACTION_TIMER;
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/*
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* The timer routine. We are called every 500ms by the kernel.
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* Handle the various virtual timers.
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*/
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void
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llc_timer()
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{
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struct llc_linkcb *linkp;
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struct llc_linkcb *nlinkp;
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int timer;
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int action;
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int s = splnet();
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/*
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* All links are accessible over the doubly linked list llccb_q
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*/
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if (!LQEMPTY) {
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/*
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* A for-loop is not that great an idea as the linkp
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* might get deleted if the age timer has expired ...
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*/
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linkp = LQFIRST;
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while (LQVALID(linkp)) {
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nlinkp = LQNEXT(linkp);
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/*
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* Check implementation specific timers first
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*/
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/* The delayed action/acknowledge idle timer */
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switch (LLC_TIMERXPIRED(linkp,DACTION)) {
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case LLC_TIMER_RUNNING:
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LLC_AGETIMER(linkp,DACTION);
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break;
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case LLC_TIMER_EXPIRED: {
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int cmdrsp;
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int pollfinal;
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switch (LLC_GETFLAG(linkp,DACTION)) {
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case LLC_DACKCMD:
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cmdrsp = LLC_CMD, pollfinal = 0;
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break;
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case LLC_DACKCMDPOLL:
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cmdrsp = LLC_CMD, pollfinal = 1;
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break;
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case LLC_DACKRSP:
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cmdrsp = LLC_RSP, pollfinal = 0;
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break;
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case LLC_DACKRSPFINAL:
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cmdrsp = LLC_RSP, pollfinal = 1;
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break;
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default:
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panic("Unexpected LLC_GETFLAG");
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return;
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}
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llc_send(linkp, LLCFT_RR, cmdrsp, pollfinal);
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LLC_STOPTIMER(linkp,DACTION);
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break;
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}
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}
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/* The link idle timer */
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switch (LLC_TIMERXPIRED(linkp,AGE)) {
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case LLC_TIMER_RUNNING:
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LLC_AGETIMER(linkp,AGE);
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break;
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case LLC_TIMER_EXPIRED:
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/*
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* Only crunch the link when really no
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* timers are running any more.
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*/
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if (llc_anytimersup(linkp) == 0) {
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llc_dellink(linkp);
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LLC_STOPTIMER(linkp,AGE);
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goto gone;
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} else {
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LLC_STARTTIMER(linkp,AGE);
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}
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break;
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}
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/*
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* Now, check all the ISO 8802-2 timers
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*/
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FOR_ALL_LLC_TIMERS(timer) {
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action = 0;
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if ((linkp->llcl_timerflags & (1<<timer)) &&
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(linkp->llcl_timers[timer] == 0)) {
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switch (timer) {
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case LLC_ACK_SHIFT:
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action = LLC_ACK_TIMER_EXPIRED;
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break;
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case LLC_P_SHIFT:
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action = LLC_P_TIMER_EXPIRED;
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break;
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case LLC_BUSY_SHIFT:
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action = LLC_BUSY_TIMER_EXPIRED;
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break;
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case LLC_REJ_SHIFT:
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action = LLC_REJ_TIMER_EXPIRED;
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break;
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}
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linkp->llcl_timerflags &= ~(1<<timer);
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(void)llc_statehandler(linkp, (struct llc *)0, action, 0, 1);
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} else if (linkp->llcl_timers[timer] > 0)
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linkp->llcl_timers[timer]--;
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}
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gone: linkp = nlinkp;
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}
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}
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splx (s);
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}
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