diff options
Diffstat (limited to 'sys/netccitt/llc_timer.c')
| -rw-r--r-- | sys/netccitt/llc_timer.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/sys/netccitt/llc_timer.c b/sys/netccitt/llc_timer.c new file mode 100644 index 0000000..0aecd08 --- /dev/null +++ b/sys/netccitt/llc_timer.c @@ -0,0 +1,180 @@ +/* + * Copyright (C) Dirk Husemann, Computer Science Department IV, + * University of Erlangen-Nuremberg, Germany, 1990, 1991, 1992 + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Dirk Husemann and the Computer Science Department (IV) of + * the University of Erlangen-Nuremberg, Germany. + * + * 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. + * + * @(#)llc_timer.c 8.1 (Berkeley) 6/10/93 + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/mbuf.h> +#include <sys/domain.h> +#include <sys/socket.h> +#include <sys/protosw.h> +#include <sys/errno.h> +#include <sys/time.h> +#include <sys/kernel.h> + +#include <net/if.h> +#include <net/if_dl.h> +#include <net/if_llc.h> + +#include <netccitt/dll.h> +#include <netccitt/llc_var.h> + + +/* + * Various timer values. They can be adjusted + * by patching the binary with adb if necessary. + */ +/* ISO 8802-2 timers */ +int llc_n2 = LLC_N2_VALUE; +int llc_ACK_timer = LLC_ACK_TIMER; +int llc_P_timer = LLC_P_TIMER; +int llc_BUSY_timer = LLC_BUSY_TIMER; +int llc_REJ_timer = LLC_REJ_TIMER; +/* Implementation specific timers */ +int llc_AGE_timer = LLC_AGE_TIMER; +int llc_DACTION_timer = LLC_DACTION_TIMER; + +/* + * The timer routine. We are called every 500ms by the kernel. + * Handle the various virtual timers. + */ + +void +llc_timer() +{ + register struct llc_linkcb *linkp; + register struct llc_linkcb *nlinkp; + register int timer; + register int action; + register int s = splimp(); + + /* + * All links are accessible over the doubly linked list llccb_q + */ + if (!LQEMPTY) { + /* + * A for-loop is not that great an idea as the linkp + * might get deleted if the age timer has expired ... + */ + linkp = LQFIRST; + while (LQVALID(linkp)) { + nlinkp = LQNEXT(linkp); + /* + * Check implementation specific timers first + */ + /* The delayed action/acknowledge idle timer */ + switch (LLC_TIMERXPIRED(linkp, DACTION)) { + case LLC_TIMER_RUNNING: + LLC_AGETIMER(linkp, DACTION); + break; + case LLC_TIMER_EXPIRED: { + register int cmdrsp; + register int pollfinal; + + switch (LLC_GETFLAG(linkp, DACTION)) { + case LLC_DACKCMD: + cmdrsp = LLC_CMD, pollfinal = 0; + break; + case LLC_DACKCMDPOLL: + cmdrsp = LLC_CMD, pollfinal = 1; + break; + case LLC_DACKRSP: + cmdrsp = LLC_RSP, pollfinal = 0; + break; + case LLC_DACKRSPFINAL: + cmdrsp = LLC_RSP, pollfinal = 1; + break; + } + llc_send(linkp, LLCFT_RR, cmdrsp, pollfinal); + LLC_STOPTIMER(linkp, DACTION); + break; + } + } + /* The link idle timer */ + switch (LLC_TIMERXPIRED(linkp, AGE)) { + case LLC_TIMER_RUNNING: + LLC_AGETIMER(linkp, AGE); + break; + case LLC_TIMER_EXPIRED: + /* + * Only crunch the link when really no + * timers are running any more. + */ + if (llc_anytimersup(linkp) == 0) { + llc_dellink(linkp); + LLC_STOPTIMER(linkp, AGE); + goto gone; + } else { + LLC_STARTTIMER(linkp, AGE); + } + break; + } + /* + * Now, check all the ISO 8802-2 timers + */ + FOR_ALL_LLC_TIMERS(timer) { + action = 0; + if ((linkp->llcl_timerflags & (1<<timer)) && + (linkp->llcl_timers[timer] == 0)) { + switch (timer) { + case LLC_ACK_SHIFT: + action = LLC_ACK_TIMER_EXPIRED; + break; + case LLC_P_SHIFT: + action = LLC_P_TIMER_EXPIRED; + break; + case LLC_BUSY_SHIFT: + action = LLC_BUSY_TIMER_EXPIRED; + break; + case LLC_REJ_SHIFT: + action = LLC_REJ_TIMER_EXPIRED; + break; + } + linkp->llcl_timerflags &= ~(1<<timer); + (void)llc_statehandler(linkp, (struct llc *)0, action, 0, 1); + } else if (linkp->llcl_timers[timer] > 0) + linkp->llcl_timers[timer]--; + } + +gone: linkp = nlinkp; + } + } + splx (s); +} |
