bsd/netat/adsp_Timer.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  *      Copyright (c) 1990, 1996-1998 Apple Computer, Inc.
  32  *      All Rights Reserved.
  33  */
  34
  35 /*
  36  * Timer.c
  37  *
  38  * From v01.12  06/22/90 mbs
  39  *    Modified for MP, 1996 by Tuyen Nguyen
  40  *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
  41  */
  42
  43 #include <sys/errno.h>
  44 #include <sys/types.h>
  45 #include <sys/param.h>
  46 #include <machine/spl.h>
  47 #include <sys/systm.h>
  48 #include <sys/kernel.h>
  49 #include <sys/proc.h>
  50 #include <sys/filedesc.h>
  51 #include <sys/fcntl.h>
  52 #include <sys/mbuf.h>
  53 #include <sys/socket.h>
  54 #include <sys/time.h>
  55
  56 #include <netat/sysglue.h>
  57 #include <netat/appletalk.h>
  58 #include <netat/at_pcb.h>
  59 #include <netat/debug.h>
  60 #include <netat/adsp.h>
  61 #include <netat/adsp_internal.h>
  62
  63 void TimerTick();
  64
  65 /*
  66  * TrashSession
  67  *
  68  * Cleanly abort a session that might be open.  Called if probe timer expires,
  69  * or from AppleTalk event handler (close or network gone away)
  70  *
  71  * Only call if the session is active (I.e. not for closed or listeners)
  72  *
  73  * INPUTS:
  74  *              session pointer
  75  * OUTPUTS:
  76  *              none
  77  */
  78 void TrashSession(sp)           /* (CCBPtr sp) */
  79     CCBPtr sp;
  80 {
  81
  82     sp->userFlags |= eTearDown;
  83     sp->removing = 1;
  84     sp->state = sClosed;
  85
  86     DoClose(sp, errAborted, 1);
  87 }
  88
  89
  90 /*
  91  * DoTimerElem
  92  *
  93  * INPUTS:
  94  *
  95  * OUTPUTS:
  96  *
  97  */
  98 void DoTimerElem(t) /* (TimerElemPtr t) */
  99     TimerElemPtr t;
 100 {
 101     CCBPtr sp;
 102
 103     sp = (CCBPtr)((Ptr)t - t->type); /* Recover stream pointer for this guy */
 104
 105     if (t->type == kFlushTimerType) { /* flush write data time just fired */
 106         if (sp->sData) {        /* If there's any data, flush it. */
 107             sp->writeFlush = 1;
 108             goto send;
 109         }
 110     } else if (t->type == kRetryTimerType) {
 111         if (sp->waitingAck) {
 112
 113             sp->waitingAck = 0;
 114             sp->sendSeq = sp->firstRtmtSeq;
 115             sp->pktSendCnt = 0;
 116             sp->resentData = 1; /* Had to resend data */
 117             sp->noXmitFlow = 1; /* Don't incr. max packets. */
 118
 119             if ((sp->pktSendMax /= 2) == 0) /* Back off on max # packets
 120                                              * sent */
 121                 sp->pktSendMax = 1;
 122
 123             if ((sp->roundTrip *= 2) > sp->probeInterval)
 124                 sp->roundTrip = sp->probeInterval;
 125             sp->rtmtInterval = sp->roundTrip + ((short)2 *
 126                                                 (short)sp->deviation);
 127             goto send;
 128         }
 129     } else if (t->type == kAttnTimerType) {
 130         if (sp->sapb) {         /* Unacknowledged attn pkt */
 131             sp->sendAttnData = 1;
 132             goto send;
 133         }
 134     } else if (t->type == kResetTimerType) {
 135         if (sp->frpb) {         /* Unacknowledged forward reset */
 136             sp->sendCtl |= B_CTL_FRESET;
 137             goto send;
 138         }
 139     } else if (t->type == kProbeTimerType) {
 140         if (sp->state == sOpen || sp->state == sClosing) {
 141             if (--sp->probeCntr == 0) { /* Connection died */
 142                 TrashSession(sp);
 143                 return;
 144             } else {
 145                 InsertTimerElem(&adspGlobal.slowTimers, &sp->ProbeTimer,
 146                                 sp->probeInterval);
 147                 sp->sendCtl |= B_CTL_PROBE;
 148                 goto send;
 149             }
 150         } else if (sp->state == sOpening) {
 151             if ((sp->openState == O_STATE_OPENWAIT) ||
 152                 (sp->openState == O_STATE_ESTABLISHED))
 153             {
 154                 if (--sp->openRetrys == 0) { /* Oops, didn't open */
 155                     sp->state = sClosed;
 156                     DoClose(sp, errOpening, 1);
 157                     return;
 158                 }               /* open failed */
 159                 else            /* Send packet again */
 160                 {
 161                     sp->sendCtl |= (sp->openState == O_STATE_OPENWAIT) ?
 162                         B_CTL_OREQ : B_CTL_OREQACK;
 163                     goto send;
 164                 }
 165             }                   /* we're opening */
 166         }
 167     }
 168
 169     else {
 170         dPrintf(D_M_ADSP, D_L_ERROR, ("DoTimerElem:Unknown timer type!\n"));
 171     }
 172
 173         return;
 174
 175 send:
 176     CheckSend(sp);
 177 }
 178
 179 void TimerTick_funnel(void *arg)
 180 {
 181         atalk_lock();
 182         TimerTick();
 183         atalk_unlock();
 184 }
 185
 186 static StopTimer;
 187
 188 /*
 189  * TimerTick
 190  *
 191  * Called 6 times per second
 192  * INPUTS:
 193  *
 194  * OUTPUTS:
 195  *
 196  */
 197 void TimerTick()                /* (void) */
 198 {
 199
 200     if (StopTimer) {
 201         return;
 202     }
 203     TimerQueueTick(&adspGlobal.slowTimers);
 204     TimerQueueTick(&adspGlobal.fastTimers);
 205     timeout(TimerTick_funnel, (caddr_t)0, HZ/6);
 206 }
 207
 208 void TimerStop()
 209 {
 210     StopTimer = 1;
 211     untimeout(TimerTick_funnel, (caddr_t) 0);
 212 }