bsd/netat/adsp_Timer.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  *      Copyright (c) 1990, 1996-1998 Apple Computer, Inc.
  24  *      All Rights Reserved.
  25  */
  26
  27 /*
  28  * Timer.c
  29  *
  30  * From v01.12  06/22/90 mbs
  31  *    Modified for MP, 1996 by Tuyen Nguyen
  32  *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
  33  */
  34
  35 #include <sys/errno.h>
  36 #include <sys/types.h>
  37 #include <sys/param.h>
  38 #include <machine/spl.h>
  39 #include <sys/systm.h>
  40 #include <sys/kernel.h>
  41 #include <sys/proc.h>
  42 #include <sys/filedesc.h>
  43 #include <sys/fcntl.h>
  44 #include <sys/mbuf.h>
  45 #include <sys/socket.h>
  46 #include <sys/time.h>
  47
  48 #include <netat/sysglue.h>
  49 #include <netat/appletalk.h>
  50 #include <netat/at_pcb.h>
  51 #include <netat/debug.h>
  52 #include <netat/adsp.h>
  53 #include <netat/adsp_internal.h>
  54
  55 void TimerTick();
  56
  57 /*
  58  * TrashSession
  59  *
  60  * Cleanly abort a session that might be open.  Called if probe timer expires,
  61  * or from AppleTalk event handler (close or network gone away)
  62  *
  63  * Only call if the session is active (I.e. not for closed or listeners)
  64  *
  65  * INPUTS:
  66  *              session pointer
  67  * OUTPUTS:
  68  *              none
  69  */
  70 void TrashSession(sp)           /* (CCBPtr sp) */
  71     CCBPtr sp;
  72 {
  73     int s;
  74
  75     ATDISABLE(s, sp->lock);
  76     sp->userFlags |= eTearDown;
  77     sp->removing = 1;
  78     sp->state = sClosed;
  79     ATENABLE(s, sp->lock);
  80
  81     DoClose(sp, errAborted, 1);
  82 }
  83
  84
  85 /*
  86  * DoTimerElem
  87  *
  88  * INPUTS:
  89  *
  90  * OUTPUTS:
  91  *
  92  */
  93 void DoTimerElem(t) /* (TimerElemPtr t) */
  94     TimerElemPtr t;
  95 {
  96     CCBPtr sp;
  97     int s;
  98
  99     sp = (CCBPtr)((Ptr)t - t->type); /* Recover stream pointer for this guy */
 100     ATDISABLE(s, sp->lock);
 101
 102     if (t->type == kFlushTimerType) { /* flush write data time just fired */
 103         if (sp->sData) {        /* If there's any data, flush it. */
 104             sp->writeFlush = 1;
 105             goto send;
 106         }
 107     } else if (t->type == kRetryTimerType) {
 108         if (sp->waitingAck) {
 109
 110             sp->waitingAck = 0;
 111             sp->sendSeq = sp->firstRtmtSeq;
 112             sp->pktSendCnt = 0;
 113             sp->resentData = 1; /* Had to resend data */
 114             sp->noXmitFlow = 1; /* Don't incr. max packets. */
 115
 116             if ((sp->pktSendMax /= 2) == 0) /* Back off on max # packets
 117                                              * sent */
 118                 sp->pktSendMax = 1;
 119
 120             if ((sp->roundTrip *= 2) > sp->probeInterval)
 121                 sp->roundTrip = sp->probeInterval;
 122             sp->rtmtInterval = sp->roundTrip + ((short)2 *
 123                                                 (short)sp->deviation);
 124             goto send;
 125         }
 126     } else if (t->type == kAttnTimerType) {
 127         if (sp->sapb) {         /* Unacknowledged attn pkt */
 128             sp->sendAttnData = 1;
 129             goto send;
 130         }
 131     } else if (t->type == kResetTimerType) {
 132         if (sp->frpb) {         /* Unacknowledged forward reset */
 133             sp->sendCtl |= B_CTL_FRESET;
 134             goto send;
 135         }
 136     } else if (t->type == kProbeTimerType) {
 137         if (sp->state == sOpen || sp->state == sClosing) {
 138             if (--sp->probeCntr == 0) { /* Connection died */
 139                 ATENABLE(s, sp->lock);
 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                     ATENABLE(s, sp->lock);
 155                     DoClose(sp, errOpening, 1);
 156                     return;
 157                 }               /* open failed */
 158                 else            /* Send packet again */
 159                 {
 160                     sp->sendCtl |= (sp->openState == O_STATE_OPENWAIT) ?
 161                         B_CTL_OREQ : B_CTL_OREQACK;
 162                     goto send;
 163                 }
 164             }                   /* we're opening */
 165         }
 166     }
 167
 168     else {
 169         dPrintf(D_M_ADSP, D_L_ERROR, ("DoTimerElem:Unknown timer type!\n"));
 170     }
 171
 172     ATENABLE(s, sp->lock);
 173         return;
 174
 175 send:
 176     ATENABLE(s, sp->lock);
 177     CheckSend(sp);
 178 }
 179
 180 void TimerTick_funnel(void *arg)
 181 {
 182         atalk_lock();
 183         TimerTick();
 184         atalk_unlock();
 185 }
 186
 187 static StopTimer;
 188
 189 /*
 190  * TimerTick
 191  *
 192  * Called 6 times per second
 193  * INPUTS:
 194  *
 195  * OUTPUTS:
 196  *
 197  */
 198 void TimerTick()                /* (void) */
 199 {
 200
 201     if (StopTimer) {
 202         return;
 203     }
 204     TimerQueueTick(&adspGlobal.slowTimers);
 205     TimerQueueTick(&adspGlobal.fastTimers);
 206     timeout(TimerTick_funnel, (caddr_t)0, HZ/6);
 207 }
 208
 209 void TimerStop()
 210 {
 211     StopTimer = 1;
 212     untimeout(TimerTick_funnel, (caddr_t) 0);
 213 }