bsd/netat/adsp_Timer.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  *      Copyright (c) 1990, 1996-1998 Apple Computer, Inc.
  30  *      All Rights Reserved.
  31  */
  32
  33 /*
  34  * Timer.c
  35  *
  36  * From v01.12  06/22/90 mbs
  37  *    Modified for MP, 1996 by Tuyen Nguyen
  38  *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
  39  */
  40
  41 #include <sys/errno.h>
  42 #include <sys/types.h>
  43 #include <sys/param.h>
  44 #include <machine/spl.h>
  45 #include <sys/systm.h>
  46 #include <sys/kernel.h>
  47 #include <sys/proc.h>
  48 #include <sys/filedesc.h>
  49 #include <sys/fcntl.h>
  50 #include <sys/mbuf.h>
  51 #include <sys/socket.h>
  52 #include <sys/time.h>
  53
  54 #include <netat/sysglue.h>
  55 #include <netat/appletalk.h>
  56 #include <netat/at_pcb.h>
  57 #include <netat/debug.h>
  58 #include <netat/adsp.h>
  59 #include <netat/adsp_internal.h>
  60
  61 void TimerTick();
  62
  63 /*
  64  * TrashSession
  65  *
  66  * Cleanly abort a session that might be open.  Called if probe timer expires,
  67  * or from AppleTalk event handler (close or network gone away)
  68  *
  69  * Only call if the session is active (I.e. not for closed or listeners)
  70  *
  71  * INPUTS:
  72  *              session pointer
  73  * OUTPUTS:
  74  *              none
  75  */
  76 void TrashSession(sp)           /* (CCBPtr sp) */
  77     CCBPtr sp;
  78 {
  79
  80     sp->userFlags |= eTearDown;
  81     sp->removing = 1;
  82     sp->state = sClosed;
  83
  84     DoClose(sp, errAborted, 1);
  85 }
  86
  87
  88 /*
  89  * DoTimerElem
  90  *
  91  * INPUTS:
  92  *
  93  * OUTPUTS:
  94  *
  95  */
  96 void DoTimerElem(t) /* (TimerElemPtr t) */
  97     TimerElemPtr t;
  98 {
  99     CCBPtr sp;
 100
 101     sp = (CCBPtr)((Ptr)t - t->type); /* Recover stream pointer for this guy */
 102
 103     if (t->type == kFlushTimerType) { /* flush write data time just fired */
 104         if (sp->sData) {        /* If there's any data, flush it. */
 105             sp->writeFlush = 1;
 106             goto send;
 107         }
 108     } else if (t->type == kRetryTimerType) {
 109         if (sp->waitingAck) {
 110
 111             sp->waitingAck = 0;
 112             sp->sendSeq = sp->firstRtmtSeq;
 113             sp->pktSendCnt = 0;
 114             sp->resentData = 1; /* Had to resend data */
 115             sp->noXmitFlow = 1; /* Don't incr. max packets. */
 116
 117             if ((sp->pktSendMax /= 2) == 0) /* Back off on max # packets
 118                                              * sent */
 119                 sp->pktSendMax = 1;
 120
 121             if ((sp->roundTrip *= 2) > sp->probeInterval)
 122                 sp->roundTrip = sp->probeInterval;
 123             sp->rtmtInterval = sp->roundTrip + ((short)2 *
 124                                                 (short)sp->deviation);
 125             goto send;
 126         }
 127     } else if (t->type == kAttnTimerType) {
 128         if (sp->sapb) {         /* Unacknowledged attn pkt */
 129             sp->sendAttnData = 1;
 130             goto send;
 131         }
 132     } else if (t->type == kResetTimerType) {
 133         if (sp->frpb) {         /* Unacknowledged forward reset */
 134             sp->sendCtl |= B_CTL_FRESET;
 135             goto send;
 136         }
 137     } else if (t->type == kProbeTimerType) {
 138         if (sp->state == sOpen || sp->state == sClosing) {
 139             if (--sp->probeCntr == 0) { /* Connection died */
 140                 TrashSession(sp);
 141                 return;
 142             } else {
 143                 InsertTimerElem(&adspGlobal.slowTimers, &sp->ProbeTimer,
 144                                 sp->probeInterval);
 145                 sp->sendCtl |= B_CTL_PROBE;
 146                 goto send;
 147             }
 148         } else if (sp->state == sOpening) {
 149             if ((sp->openState == O_STATE_OPENWAIT) ||
 150                 (sp->openState == O_STATE_ESTABLISHED))
 151             {
 152                 if (--sp->openRetrys == 0) { /* Oops, didn't open */
 153                     sp->state = sClosed;
 154                     DoClose(sp, errOpening, 1);
 155                     return;
 156                 }               /* open failed */
 157                 else            /* Send packet again */
 158                 {
 159                     sp->sendCtl |= (sp->openState == O_STATE_OPENWAIT) ?
 160                         B_CTL_OREQ : B_CTL_OREQACK;
 161                     goto send;
 162                 }
 163             }                   /* we're opening */
 164         }
 165     }
 166
 167     else {
 168         dPrintf(D_M_ADSP, D_L_ERROR, ("DoTimerElem:Unknown timer type!\n"));
 169     }
 170
 171         return;
 172
 173 send:
 174     CheckSend(sp);
 175 }
 176
 177 void TimerTick_funnel(void *arg)
 178 {
 179         atalk_lock();
 180         TimerTick();
 181         atalk_unlock();
 182 }
 183
 184 static StopTimer;
 185
 186 /*
 187  * TimerTick
 188  *
 189  * Called 6 times per second
 190  * INPUTS:
 191  *
 192  * OUTPUTS:
 193  *
 194  */
 195 void TimerTick()                /* (void) */
 196 {
 197
 198     if (StopTimer) {
 199         return;
 200     }
 201     TimerQueueTick(&adspGlobal.slowTimers);
 202     TimerQueueTick(&adspGlobal.fastTimers);
 203     timeout(TimerTick_funnel, (caddr_t)0, HZ/6);
 204 }
 205
 206 void TimerStop()
 207 {
 208     StopTimer = 1;
 209     untimeout(TimerTick_funnel, (caddr_t) 0);
 210 }