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 <net/if.h>
  55
  56 #include <netat/sysglue.h>
  57 #include <netat/appletalk.h>
  58 #include <netat/at_pcb.h>
  59 #include <netat/at_var.h>
  60 #include <netat/debug.h>
  61 #include <netat/adsp.h>
  62 #include <netat/adsp_internal.h>
  63
  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(CCBPtr);
  79
  80 void TrashSession(sp)           /* (CCBPtr sp) */
  81     CCBPtr sp;
  82 {
  83
  84     sp->userFlags |= eTearDown;
  85     sp->removing = 1;
  86     sp->state = sClosed;
  87
  88     DoClose(sp, errAborted, 1);
  89 }
  90
  91
  92 /*
  93  * DoTimerElem
  94  *
  95  * INPUTS:
  96  *
  97  * OUTPUTS:
  98  *
  99  */
 100 void DoTimerElem(TimerElemPtr);
 101
 102 void DoTimerElem(t) /* (TimerElemPtr t) */
 103     TimerElemPtr t;
 104 {
 105     CCBPtr sp;
 106
 107     sp = (CCBPtr)((Ptr)t - t->type); /* Recover stream pointer for this guy */
 108
 109     if (t->type == kFlushTimerType) { /* flush write data time just fired */
 110         if (sp->sData) {        /* If there's any data, flush it. */
 111             sp->writeFlush = 1;
 112             goto send;
 113         }
 114     } else if (t->type == kRetryTimerType) {
 115         if (sp->waitingAck) {
 116
 117             sp->waitingAck = 0;
 118             sp->sendSeq = sp->firstRtmtSeq;
 119             sp->pktSendCnt = 0;
 120             sp->resentData = 1; /* Had to resend data */
 121             sp->noXmitFlow = 1; /* Don't incr. max packets. */
 122
 123             if ((sp->pktSendMax /= 2) == 0) /* Back off on max # packets
 124                                              * sent */
 125                 sp->pktSendMax = 1;
 126
 127             if ((sp->roundTrip *= 2) > sp->probeInterval)
 128                 sp->roundTrip = sp->probeInterval;
 129             sp->rtmtInterval = sp->roundTrip + ((short)2 *
 130                                                 (short)sp->deviation);
 131             goto send;
 132         }
 133     } else if (t->type == kAttnTimerType) {
 134         if (sp->sapb) {         /* Unacknowledged attn pkt */
 135             sp->sendAttnData = 1;
 136             goto send;
 137         }
 138     } else if (t->type == kResetTimerType) {
 139         if (sp->frpb) {         /* Unacknowledged forward reset */
 140             sp->sendCtl |= B_CTL_FRESET;
 141             goto send;
 142         }
 143     } else if (t->type == kProbeTimerType) {
 144         if (sp->state == sOpen || sp->state == sClosing) {
 145             if (--sp->probeCntr == 0) { /* Connection died */
 146                 TrashSession(sp);
 147                 return;
 148             } else {
 149                 InsertTimerElem(&adspGlobal.slowTimers, &sp->ProbeTimer,
 150                                 sp->probeInterval);
 151                 sp->sendCtl |= B_CTL_PROBE;
 152                 goto send;
 153             }
 154         } else if (sp->state == sOpening) {
 155             if ((sp->openState == O_STATE_OPENWAIT) ||
 156                 (sp->openState == O_STATE_ESTABLISHED))
 157             {
 158                 if (--sp->openRetrys == 0) { /* Oops, didn't open */
 159                     sp->state = sClosed;
 160                     DoClose(sp, errOpening, 1);
 161                     return;
 162                 }               /* open failed */
 163                 else            /* Send packet again */
 164                 {
 165                     sp->sendCtl |= (sp->openState == O_STATE_OPENWAIT) ?
 166                         B_CTL_OREQ : B_CTL_OREQACK;
 167                     goto send;
 168                 }
 169             }                   /* we're opening */
 170         }
 171     }
 172
 173     else {
 174         dPrintf(D_M_ADSP, D_L_ERROR, ("DoTimerElem:Unknown timer type!\n"));
 175     }
 176
 177         return;
 178
 179 send:
 180     CheckSend(sp);
 181 }
 182
 183 void TimerTick_funnel(void *arg);
 184
 185 void TimerTick_funnel(__unused void *arg)
 186 {
 187         atalk_lock();
 188         TimerTick();
 189         atalk_unlock();
 190 }
 191
 192 static int StopTimer;
 193
 194 /*
 195  * TimerTick
 196  *
 197  * Called 6 times per second
 198  * INPUTS:
 199  *
 200  * OUTPUTS:
 201  *
 202  */
 203 void TimerTick()                /* (void) */
 204 {
 205
 206     if (StopTimer) {
 207         return;
 208     }
 209     TimerQueueTick(&adspGlobal.slowTimers);
 210     TimerQueueTick(&adspGlobal.fastTimers);
 211     timeout(TimerTick_funnel, (caddr_t)0, HZ/6);
 212 }
 213
 214 void TimerStop()
 215 {
 216     StopTimer = 1;
 217     untimeout(TimerTick_funnel, (caddr_t) 0);
 218 }