diff options
Diffstat (limited to 'sys/netccitt/pk_timer.c')
| -rw-r--r-- | sys/netccitt/pk_timer.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/sys/netccitt/pk_timer.c b/sys/netccitt/pk_timer.c new file mode 100644 index 000000000000..34a3a73407d7 --- /dev/null +++ b/sys/netccitt/pk_timer.c @@ -0,0 +1,118 @@ +/* + * 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: @(#)pk_timer.c 7.5 (Berkeley) 5/29/91 + * $Id: pk_timer.c,v 1.2 1993/10/16 19:46:55 rgrimes Exp $ + */ + +#include "param.h" +#include "systm.h" +#include "mbuf.h" +#include "socket.h" +#include "protosw.h" +#include "socketvar.h" +#include "errno.h" + +#include "../net/if.h" + +#include "x25.h" +#include "pk.h" +#include "pk_var.h" + +/* + * Various timer values. They can be adjusted + * by patching the binary with adb if necessary. + */ +int pk_t20 = 18 * PR_SLOWHZ; /* restart timer */ +int pk_t21 = 20 * PR_SLOWHZ; /* call timer */ +/* XXX pk_t22 is never used */ +int pk_t22 = 18 * PR_SLOWHZ; /* reset timer */ +int pk_t23 = 18 * PR_SLOWHZ; /* clear timer */ + +pk_timer () +{ + register struct pkcb *pkp; + register struct pklcd *lcp, **pp; + register int lcns_jammed, cant_restart; + + for (pkp = pkcbhead; pkp; pkp = pkp->pk_next) { + switch (pkp -> pk_state) { + case DTE_SENT_RESTART: + lcp = pkp -> pk_chan[0]; + /* + * If restart failures are common, a link level + * reset should be initiated here. + */ + if (lcp -> lcd_timer && --lcp -> lcd_timer == 0) + pk_message (0, pkp -> pk_xcp, + "packet level restart failed"); + break; + + case DTE_READY: + lcns_jammed = cant_restart = 0; + for (pp = &pkp -> pk_chan[1]; pp <= &pkp -> pk_chan[pkp -> pk_maxlcn]; pp++) { + if ((lcp = *pp) == 0) + continue; + switch (lcp -> lcd_state) { + case SENT_CALL: + if (--lcp -> lcd_timer == 0) { + if (lcp -> lcd_so) + lcp -> lcd_so -> so_error = ETIMEDOUT; + pk_clear (lcp, 49, 1); + } + break; + + case SENT_CLEAR: + if (lcp -> lcd_retry >= 3) + lcns_jammed++; + else + if (--lcp -> lcd_timer == 0) + pk_clear (lcp, 50, 1); + break; + + case DATA_TRANSFER: /* lcn active */ + cant_restart++; + break; + } + } + if (lcns_jammed > pkp -> pk_maxlcn / 2 && cant_restart == 0) { + pk_message (0, pkp -> pk_xcp, "%d lcns jammed: attempting restart", lcns_jammed); + pk_restart (pkp, 0); + } + } + } +} |