bsd/netat/adsp_reset.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  * Reset.c
  32  *
  33  * From  v01.15 07/11/90 mbs
  34  */
  35 /*
  36  * Change log:
  37  *   06/29/95 - Modified to handle flow control for writing (Tuyen Nguyen)
  38  *    Modified for MP, 1996 by Tuyen Nguyen
  39  *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
  40  */
  41
  42 #include <sys/errno.h>
  43 #include <sys/types.h>
  44 #include <sys/param.h>
  45 #include <machine/spl.h>
  46 #include <sys/systm.h>
  47 #include <sys/kernel.h>
  48 #include <sys/proc.h>
  49 #include <sys/filedesc.h>
  50 #include <sys/fcntl.h>
  51 #include <sys/mbuf.h>
  52 #include <sys/socket.h>
  53 #include <sys/time.h>
  54
  55 #include <netat/sysglue.h>
  56 #include <netat/appletalk.h>
  57 #include <netat/at_pcb.h>
  58 #include <netat/debug.h>
  59 #include <netat/adsp.h>
  60 #include <netat/adsp_internal.h>
  61
  62 /*
  63  * RXFReset
  64  *
  65  * We just got a Forward Reset Packet.
  66  *
  67  * Called with interrupts OFF
  68  *
  69  * INPUTS:
  70  *      stream pointer
  71  *      Pointer to ADSP header,
  72  * OUTPUTS:
  73  *      Returns 1 if packet was ignored
  74  */
  75 int RXFReset(sp, f)             /* (CCBPtr sp, ADSP_FRAMEPtr f) */
  76     CCBPtr sp;
  77     ADSP_FRAMEPtr f;
  78 {
  79     unsigned int pktFirstByteSeq;
  80     unsigned int hi;
  81     register gbuf_t *mp;
  82     register struct adspcmd *pb;
  83
  84     pktFirstByteSeq = UAL_VALUE_NTOH(f->pktFirstByteSeq);
  85
  86     hi = sp->recvSeq + CalcRecvWdw(sp);
  87
  88     /*
  89      * Must do this with interrupts OFF
  90      */
  91     if (BETWEEN(sp->recvSeq, pktFirstByteSeq, hi)) /* Is this acceptable? */
  92     {
  93         sp->recvSeq = pktFirstByteSeq;
  94         while (mp = sp->rbuf_mb) { /* clear the receive queue */
  95             sp->rbuf_mb = gbuf_next(mp);
  96             gbuf_freem(mp);
  97         }
  98         if (sp->crbuf_mb) {
  99             gbuf_freem(sp->crbuf_mb);
 100             sp->crbuf_mb = 0;
 101         }
 102         sp->rData = 0;
 103         sp->rbufFull = 0;
 104         sp->userFlags |= eFwdReset; /* Set forward reset received Flag */
 105
 106         mp = gbuf_alloc(sizeof(struct adspcmd), PRI_HI);
 107         pb = (struct adspcmd *)gbuf_rptr(mp);
 108         gbuf_winc(mp,sizeof(struct adspcmd));
 109         pb->ioc = 0;
 110         pb->mp = mp;
 111
 112         pb->csCode = dspReset;
 113         pb->ioResult = 0;
 114         completepb(sp, pb);
 115         sp->userFlags &= ~eFwdReset;
 116     }
 117
 118     if (LTE(pktFirstByteSeq, hi)) {
 119         sp->sendCtl |= B_CTL_FRESETACK; /* Ack it if it's OK, or a duplicate */
 120         sp->callSend = 1;
 121     }
 122
 123     return 0;
 124 }
 125
 126
 127 /*
 128  * RXFResetAck
 129  *
 130  * We just got a Forward Reset Acknowledgement packet
 131  *
 132  * Called with interrupts OFF
 133  *
 134  * INPUTS:
 135  *        stream pointer
 136  *    Pointer to ADSP header,
 137  * OUTPUTS:
 138  *    Returns 1 if packet was ignored
 139  */
 140 int RXFResetAck(sp, f)          /* (CCBPtr sp, ADSP_FRAMEPtr f) */
 141     CCBPtr sp;
 142     ADSP_FRAMEPtr f;
 143 {
 144     unsigned int  PktNextRecvSeq;
 145
 146     if (sp->frpb == 0)          /* Not expecting frwd reset Ack packet */
 147         return 1;
 148
 149     PktNextRecvSeq = UAL_VALUE_NTOH(f->pktNextRecvSeq);
 150
 151     if (BETWEEN(sp->sendSeq, PktNextRecvSeq, sp->sendWdwSeq+1)) {
 152         struct adspcmd *pb;
 153
 154         RemoveTimerElem(&adspGlobal.fastTimers, &sp->ResetTimer);
 155                                 /* Remove timer */
 156
 157         /*
 158          * Interrupts are OFF here while we muck with the linked list
 159          */
 160         pb = sp->frpb;          /* Unlink copy of user's parameter block */
 161         sp->frpb = (struct adspcmd *)pb->qLink;
 162
 163         pb->ioResult = 0;
 164         completepb(sp, pb);     /* complete(pb, 0); */
 165
 166         if (sp->state == sClosing) /* this ack may allow us to close... */
 167             CheckOkToClose(sp);
 168
 169         if (sp->frpb)           /* Another to send? */
 170         {
 171             sp->callSend = 1;
 172             sp->sendCtl |= B_CTL_FRESET;
 173         }
 174     }
 175
 176     return 0;
 177 }
 178
 179
 180 /*
 181  * dspReset
 182  *
 183  * INPUTS:
 184  *      --> ccbRefNum           refnum of connection end
 185  *
 186  * OUTPUTS:
 187  *      none
 188  *
 189  * ERRORS:
 190  *      errRefNum               bad connection refnum
 191  *      errState                connection is not open
 192  *      errAborted              request aborted by Remove or Close call
 193  */
 194 int adspReset(sp, pb)           /* (DSPPBPtr pb) */
 195     CCBPtr sp;
 196     struct adspcmd *pb;
 197 {
 198     register gbuf_t *mp;
 199     register struct adspcmd *rpb;
 200
 201     if (sp == 0) {
 202         pb->ioResult = errRefNum;
 203         return EINVAL;
 204     }
 205
 206     if (sp->state != sOpen) {
 207         pb->ioResult = errState;
 208         return EINVAL;
 209     }
 210
 211
 212     while (mp = sp->sbuf_mb) { /* clear the send queue */
 213         sp->sbuf_mb = gbuf_next(mp);
 214         gbuf_freem(mp);
 215     }
 216     if (sp->csbuf_mb) {
 217         gbuf_freem(sp->csbuf_mb);
 218         sp->csbuf_mb = 0;
 219     }
 220     sp->sData = 0;
 221     sp->writeFlush = 0;
 222     sp->sendCtl |= B_CTL_FRESET;
 223
 224     sp->firstRtmtSeq = sp->sendSeq; /* Reset sequence #'s */
 225     if (mp = gbuf_copym(pb->mp)) {      /* copy the parameter block */
 226             adspioc_ack(0, pb->ioc, pb->gref); /* release user */
 227             rpb = (struct adspcmd *)gbuf_rptr(mp);
 228             rpb->ioc = 0;               /* unlink copy */
 229             rpb->mp = mp;
 230
 231             qAddToEnd(&sp->frpb, rpb);
 232                                 /* Hold on to pb (will be completed when */
 233                                 /* forward reset ack is received). */
 234     } else {                    /* assume it will work... but keep no
 235                                  * bookkeeping for it.  yetch! */
 236             adspioc_ack(0, pb->ioc, pb->gref);
 237     }
 238
 239     CheckSend(sp);
 240     return STR_IGNORE;
 241
 242 }