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 /*
  56  * TrashSession
  57  *
  58  * Cleanly abort a session that might be open.  Called if probe timer expires,
  59  * or from AppleTalk event handler (close or network gone away)
  60  *
  61  * Only call if the session is active (I.e. not for closed or listeners)
  62  *
  63  * INPUTS:
  64  *              session pointer
  65  * OUTPUTS:
  66  *              none
  67  */
  68 void TrashSession(sp)           /* (CCBPtr sp) */
  69     CCBPtr sp;
  70 {
  71     int s;
  72
  73     ATDISABLE(s, sp->lock);
  74     sp->userFlags |= eTearDown;
  75     sp->removing = 1;
  76     sp->state = sClosed;
  77     ATENABLE(s, sp->lock);
  78
  79     DoClose(sp, errAborted, 1);
  80 }
  81
  82
  83 /*
  84  * DoTimerElem
  85  *
  86  * INPUTS:
  87  *
  88  * OUTPUTS:
  89  *
  90  */
  91 void DoTimerElem(t) /* (TimerElemPtr t) */
  92     TimerElemPtr t;
  93 {
  94     CCBPtr sp;
  95     int s;
  96
  97     sp = (CCBPtr)((Ptr)t - t->type); /* Recover stream pointer for this guy */
  98     ATDISABLE(s, sp->lock);
  99
 100     if (t->type == kFlushTimerType) { /* flush write data time just fired */
 101         if (sp->sData) {        /* If there's any data, flush it. */
 102             sp->writeFlush = 1;
 103             goto send;
 104         }
 105     } else if (t->type == kRetryTimerType) {
 106         if (sp->waitingAck) {
 107
 108             sp->waitingAck = 0;
 109             sp->sendSeq = sp->firstRtmtSeq;
 110             sp->pktSendCnt = 0;
 111             sp->resentData = 1; /* Had to resend data */
 112             sp->noXmitFlow = 1; /* Don't incr. max packets. */
 113
 114             if ((sp->pktSendMax /= 2) == 0) /* Back off on max # packets
 115                                              * sent */
 116                 sp->pktSendMax = 1;
 117
 118             if ((sp->roundTrip *= 2) > sp->probeInterval)
 119                 sp->roundTrip = sp->probeInterval;
 120             sp->rtmtInterval = sp->roundTrip + ((short)2 *
 121                                                 (short)sp->deviation);
 122             goto send;
 123         }
 124     } else if (t->type == kAttnTimerType) {
 125         if (sp->sapb) {         /* Unacknowledged attn pkt */
 126             sp->sendAttnData = 1;
 127             goto send;
 128         }
 129     } else if (t->type == kResetTimerType) {
 130         if (sp->frpb) {         /* Unacknowledged forward reset */
 131             sp->sendCtl |= B_CTL_FRESET;
 132             goto send;
 133         }
 134     } else if (t->type == kProbeTimerType) {
 135         if (sp->state == sOpen || sp->state == sClosing) {
 136             if (--sp->probeCntr == 0) { /* Connection died */
 137                 ATENABLE(s, sp->lock);
 138                 TrashSession(sp);
 139                 return;
 140             } else {
 141                 InsertTimerElem(&adspGlobal.slowTimers, &sp->ProbeTimer,
 142                                 sp->probeInterval);
 143                 sp->sendCtl |= B_CTL_PROBE;
 144                 goto send;
 145             }
 146         } else if (sp->state == sOpening) {
 147             if ((sp->openState == O_STATE_OPENWAIT) ||
 148                 (sp->openState == O_STATE_ESTABLISHED))
 149             {
 150                 if (--sp->openRetrys == 0) { /* Oops, didn't open */
 151                     sp->state = sClosed;
 152                     ATENABLE(s, sp->lock);
 153                     DoClose(sp, errOpening, 1);
 154                     return;
 155                 }               /* open failed */
 156                 else            /* Send packet again */
 157                 {
 158                     sp->sendCtl |= (sp->openState == O_STATE_OPENWAIT) ?
 159                         B_CTL_OREQ : B_CTL_OREQACK;
 160                     goto send;
 161                 }
 162             }                   /* we're opening */
 163         }
 164     }
 165
 166     else {
 167         dPrintf(D_M_ADSP, D_L_ERROR, ("DoTimerElem:Unknown timer type!\n"));
 168     }
 169
 170     ATENABLE(s, sp->lock);
 171         return;
 172
 173 send:
 174     ATENABLE(s, sp->lock);
 175     CheckSend(sp);
 176 }
 177
 178 void TimerTick_funnel()
 179 {
 180         thread_funnel_set(network_flock, TRUE);
 181         TimerTick();
 182         thread_funnel_set(network_flock, FALSE);
 183 }
 184
 185 static StopTimer;
 186
 187 /*
 188  * TimerTick
 189  *
 190  * Called 6 times per second
 191  * INPUTS:
 192  *
 193  * OUTPUTS:
 194  *
 195  */
 196 void TimerTick()                /* (void) */
 197 {
 198
 199     if (StopTimer) {
 200         return;
 201     }
 202     TimerQueueTick(&adspGlobal.slowTimers);
 203     TimerQueueTick(&adspGlobal.fastTimers);
 204     timeout(TimerTick_funnel, (caddr_t)0, HZ/6);
 205 }
 206
 207 void TimerStop()
 208 {
 209     StopTimer = 1;
 210     untimeout(TimerTick_funnel, (caddr_t) 0);
 211 }