bsd/netat/adsp_Control.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, 1995-1998 Apple Computer, Inc.
  30  *      All Rights Reserved.
  31  */
  32
  33 /* Control.c
  34  * From Mike Shoemaker v01.25 07/02/90 for MacOS
  35  * 09/07/95 - Modified for performance (Tuyen Nguyen)
  36  *    Modified for MP, 1996 by Tuyen Nguyen
  37  *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
  38  */
  39
  40 #include <sys/errno.h>
  41 #include <sys/types.h>
  42 #include <sys/param.h>
  43 #include <machine/spl.h>
  44 #include <sys/systm.h>
  45 #include <sys/kernel.h>
  46 #include <sys/proc.h>
  47 #include <sys/filedesc.h>
  48 #include <sys/fcntl.h>
  49 #include <sys/mbuf.h>
  50 #include <sys/time.h>
  51 #include <sys/socket.h>
  52
  53 #include <netat/sysglue.h>
  54 #include <netat/appletalk.h>
  55 #include <netat/ddp.h>
  56 #include <netat/at_pcb.h>
  57 #include <netat/debug.h>
  58 #include <netat/adsp.h>
  59 #include <netat/adsp_internal.h>
  60
  61 /* # of additional ticks to add to any timer that we're queuing up.  For
  62  * very short delays (1 and 2), the timer fires before the transmit
  63  * even takes place */
  64 #define TX_DLY  2
  65
  66 int adsp_window = 1;
  67
  68 /*
  69  * CalcRecvWdw
  70  *
  71  * INPUTS:
  72  *              sp              ADSP Stream
  73  * OUTPUTS:
  74  *              # of bytes in avail in local receive queue
  75  */
  76 int CalcRecvWdw(sp)             /* (CCBPtr sp) */
  77     CCBPtr sp;
  78 {
  79     int bytes;
  80
  81     bytes = calcRecvQ(sp);
  82     bytes = sp->rbuflen - bytes; /* get what is left */
  83
  84     if (bytes <= 16) {          /* %%% this should be zero */
  85         sp->rbufFull = 1;       /* Save flag that our recv buf is full */
  86         return 0;
  87     }
  88     else
  89         return ((bytes+bytes+bytes) >> 2) + 1; /* %%% */
  90 }
  91
  92 calcRecvQ(sp)
  93     CCBPtr sp;
  94 {
  95     int bytes = 0;
  96 #ifdef AT_Socket
  97     register struct mbuf *m, *p;
  98
  99     if (((sp->gref)->so)->so_rcv.sb_mb)
 100       for (p = ((sp->gref)->so)->so_rcv.sb_mb; p; p = p->m_nextpkt)
 101         for (m = p; m; m = m->m_next)
 102           bytes += m->m_len;
 103 #else
 104     register gbuf_t *mb;
 105
 106     if (sp->rData) {            /* There is data in buffer */
 107         if (mb = sp->rbuf_mb) {
 108             do {
 109                 bytes += gbuf_msgsize(mb);
 110                 mb = gbuf_next(mb);
 111             } while (mb);
 112         }
 113         if (mb = sp->crbuf_mb)
 114             bytes += gbuf_msgsize(mb);
 115     }
 116 #endif
 117     return bytes;
 118 }
 119
 120 /*
 121  * CheckSend
 122  *
 123  * Check to see if the transmit PB is available and if there is anything
 124  * to transmit. Start off any pending transmit.
 125  *
 126  * Normally called from the write completion routine
 127  *
 128  * INPUTS:
 129  *              sp              Connection control block
 130  * OUTPUTS:
 131  *              true if sent a packet
 132  */
 133 void CheckSend(sp)              /* (CCBPtr sp) */
 134     register CCBPtr sp;
 135 {
 136     int i;
 137     int attnMsg;                /* True if attention message */
 138     int s;
 139     register gbuf_t *mp;        /* send message block */
 140 #ifdef notdef
 141     register gbuf_t *tmp;
 142     u_char current;
 143 #endif
 144     char *dp;                   /* a data pointer */
 145     int use_attention_code;
 146     int len;                    /* length used in allocd mblk */
 147     int datalen;                /* amount of data attached to mblk */
 148     gbuf_t *mprev, *mlist = 0;
 149
 150 top:
 151
 152     if (sp->state == sClosed)
 153         return;
 154
 155                                 /* get a message block to hold DDP and
 156                                  * ADSP headers + 2 bytes of attention
 157                                  * code if necessary */
 158     if ((mp = gbuf_alloc(AT_WR_OFFSET + DDPL_FRAME_LEN + ADSP_FRAME_LEN + ADSP_OPEN_FRAME_LEN + 2,
 159                      PRI_LO)) == 0) {
 160         if (mlist)
 161                 gbuf_freel(mlist);
 162         return;         /* can't get buffers... do nothing! */
 163     }
 164     ATDISABLE(s, sp->lock);
 165     sp->callSend = 0;           /* Clear flag */
 166     use_attention_code = 0;
 167     len = 0;
 168     datalen = 0;
 169
 170     gbuf_rinc(mp,AT_WR_OFFSET);
 171     gbuf_wset(mp,DDPL_FRAME_LEN); /* leave room for DDP header */
 172
 173     if (sp->sendCtl) {
 174         short mask = 0;
 175
 176         i = sp->sendCtl;        /* get local copy bitmap of */
 177                                 /* which ctl packets to send. */
 178         attnMsg = 0;
 179
 180         if (i & 0x1E)           /* One of the open ctrl packets */
 181         {
 182
 183             /* point past ADSP header (no attention) */
 184             dp = ((char *) gbuf_wptr(mp)) + ADSP_FRAME_LEN;
 185             UAL_ASSIGN(sp->f.pktFirstByteSeq, netdw(sp->firstRtmtSeq));
 186
 187             UAS_ASSIGN(sp->of.version, netw(0x0100)); /* Fill in open connection parms */
 188             UAS_ASSIGN(sp->of.dstCID, sp->remCID);      /* Destination CID */
 189             UAL_ASSIGN(sp->of.pktAttnRecvSeq, netdw(sp->attnRecvSeq));
 190             bcopy((caddr_t) &sp->of, (caddr_t) dp, ADSP_OPEN_FRAME_LEN);
 191             len += ADSP_OPEN_FRAME_LEN;
 192
 193             if (i & B_CTL_OREQ) {
 194                 UAS_ASSIGN(sp->f.CID, sp->locCID);
 195                 mask = B_CTL_OREQ;
 196                 sp->f.descriptor = ADSP_CONTROL_BIT | ADSP_CTL_OREQ;
 197             } else if (i & B_CTL_OACK) {
 198                 UAS_ASSIGN(sp->f.CID, sp->locCID);
 199                 mask = B_CTL_OACK;
 200                 sp->f.descriptor = ADSP_CONTROL_BIT | ADSP_CTL_OACK;
 201             } else if (i & B_CTL_OREQACK) {
 202                 UAS_ASSIGN(sp->f.CID, sp->locCID);
 203                 mask = B_CTL_OREQACK;
 204                 sp->f.descriptor = ADSP_CONTROL_BIT | ADSP_CTL_OREQACK;
 205             } else              /* Deny */
 206             {
 207                 UAS_ASSIGN(sp->f.CID, 0);
 208                 mask = B_CTL_ODENY;
 209                 sp->f.descriptor = ADSP_CONTROL_BIT | ADSP_CTL_ODENY;
 210                 UAL_ASSIGN(sp->f.pktFirstByteSeq, 0);
 211             }
 212
 213             if (i & (B_CTL_OREQ | B_CTL_OREQACK))
 214                 /* Need to start up a timer for it */
 215             {
 216                 /* It's possible that we've received a duplicate
 217                  * open request.  In this case, there will already be
 218                  * a timer queued up for the request+ack
 219                  *  packet we sent the first time.  So remove the timer
 220                  * and start another.
 221                  */
 222                 RemoveTimerElem(&adspGlobal.slowTimers, &sp->ProbeTimer);
 223                 InsertTimerElem(&adspGlobal.slowTimers, &sp->ProbeTimer,
 224                                 sp->openInterval+1);
 225             }
 226         } else {
 227             /* seq # of next byte to send */
 228             UAL_ASSIGN(sp->f.pktFirstByteSeq, netdw(sp->sendSeq));
 229
 230             if (i & B_CTL_CLOSE) {
 231                 sp->state = sClosed; /* Now we're closed */
 232                 mask = B_CTL_CLOSE;
 233                 sp->f.descriptor = ADSP_CONTROL_BIT | ADSP_CTL_CLOSE;
 234             } else if (i & B_CTL_PROBE) {
 235                 mask = B_CTL_PROBE;
 236                 sp->f.descriptor =
 237                     ADSP_CONTROL_BIT | ADSP_CTL_PROBE | ADSP_ACK_REQ_BIT;
 238             } else if (i & B_CTL_FRESET) {
 239                 mask = B_CTL_FRESET;
 240                 sp->f.descriptor = ADSP_CONTROL_BIT | ADSP_CTL_FRESET;
 241                 InsertTimerElem(&adspGlobal.fastTimers,
 242                                 &sp->ResetTimer, sp->rtmtInterval+TX_DLY);
 243             } else if (i & B_CTL_FRESETACK) {
 244                 mask = B_CTL_FRESETACK;
 245                 sp->f.descriptor = ADSP_CONTROL_BIT | ADSP_CTL_FRESET_ACK;
 246             }
 247             else if (i & B_CTL_RETRANSMIT) {
 248                 mask = B_CTL_RETRANSMIT;
 249                 sp->f.descriptor = ADSP_CONTROL_BIT | ADSP_CTL_RETRANSMIT;
 250             }
 251             else {
 252                 dPrintf(D_M_ADSP, D_L_ERROR, ("CheckSend: Control bit error\n"));
 253            }
 254         }                       /* non open control packet */
 255
 256         sp->sendCtl &= ~mask;
 257         goto sendit;
 258     }                           /* send control packet */
 259
 260     if (sp->sendAttnData)       /* Send attn ready to go? */
 261     {
 262         sp->sendAttnData = 0;   /* Clear Flags */
 263         if (sp->sapb) {
 264             sp->sendAttnAck  = 0; /* This will also do an Attn Ack */
 265
 266             attnMsg = 1;
 267             sp->f.descriptor = ADSP_ATTENTION_BIT | ADSP_ACK_REQ_BIT;
 268             if (gbuf_cont(sp->sapb->mp)) {
 269                 gbuf_cont(mp) = gbuf_dupm(gbuf_cont(sp->sapb->mp));
 270                 /* Major hack here.  The ADSP Attn code is butted up against
 271                  * the end of the adsp packet header, and the length is
 272                  * increased by 2.  (There is a pad field behind the adsp
 273                  * header in the CCB just for this purpose.)
 274                  */
 275             }
 276             use_attention_code++;
 277
 278             sp->f.data[0] = high(sp->sapb->u.attnParams.attnCode);
 279             sp->f.data[1] = low(sp->sapb->u.attnParams.attnCode);
 280             InsertTimerElem(&adspGlobal.fastTimers, &sp->AttnTimer,
 281                                                      sp->rtmtInterval+TX_DLY);
 282             goto sendit;
 283         }
 284     }                           /* attn data */
 285
 286     if (sp->sendAttnAck)        /* Send attn ack ready to go? */
 287     {
 288         attnMsg = 1;
 289         sp->f.descriptor = ADSP_CONTROL_BIT | ADSP_ATTENTION_BIT;
 290         sp->sendAttnAck = 0;
 291         goto sendit;
 292     }                           /* attn ack */
 293
 294     if ((sp->state == sOpen || sp->state == sClosing) && /* Correct state */
 295         (!sp->waitingAck) &&    /* not waiting for an ACK */
 296         (sp->sData) &&          /* have data to send */
 297         (GTE(sp->sendWdwSeq,sp->sendSeq)) && /* he has room to accept it */
 298         (sp->pktSendCnt < sp->pktSendMax)) /* haven't sent too many pkts
 299                                             * in a row. */
 300     {
 301         attnMsg = 0;
 302         if (datalen = attachData(sp, mp)) /* attach data to mp */
 303             goto sendit;        /* if successful, sendit */
 304     }
 305
 306     if (sp->sendDataAck) {
 307         UAL_ASSIGN(sp->f.pktFirstByteSeq, netdw(sp->sendSeq)); /* seq # of next byte */
 308         attnMsg = 0;
 309         sp->f.descriptor = ADSP_CONTROL_BIT;
 310         goto sendit;
 311     }
 312
 313     /*
 314      * Nothing left to do...
 315      */
 316     if (mp)
 317         gbuf_freem(mp);
 318     ATENABLE(s, sp->lock);
 319     if (mlist)
 320         adsp_sendddp(sp, mlist, 0, &sp->remoteAddress, DDP_ADSP);
 321     return;
 322
 323 sendit:
 324
 325     if (attnMsg) {
 326         UAL_ASSIGN(sp->f.pktFirstByteSeq, netdw(sp->attnSendSeq));
 327         UAL_ASSIGN(sp->f.pktNextRecvSeq, netdw(sp->attnRecvSeq));
 328         UAS_ASSIGN(sp->f.pktRecvWdw, 0);        /* Always zero in attn pkt */
 329     } else {
 330         sp->sendDataAck = 0;
 331         UAL_ASSIGN(sp->f.pktNextRecvSeq, netdw(sp->recvSeq));
 332         UAS_ASSIGN(sp->f.pktRecvWdw, netw(CalcRecvWdw(sp)));
 333     }
 334     if (use_attention_code) {
 335         bcopy((caddr_t) &sp->f, (caddr_t) gbuf_wptr(mp), ADSP_FRAME_LEN + 2);
 336         len += ADSP_FRAME_LEN + 2;
 337     } else {
 338         bcopy((caddr_t) &sp->f, (caddr_t) gbuf_wptr(mp), ADSP_FRAME_LEN);
 339         len += ADSP_FRAME_LEN;
 340     }
 341     gbuf_winc(mp,len);          /* update mblk length  */
 342     if (mlist)
 343         gbuf_next(mprev) = mp;
 344     else
 345         mlist = mp;
 346     mprev = mp;
 347
 348     if (sp->state == sClosed) { /* must have sent a close advice */
 349                                 /* send header + data */
 350         ATENABLE(s, sp->lock);
 351         adsp_sendddp(sp, mlist, 0, &sp->remoteAddress, DDP_ADSP);
 352         DoClose(sp, 0, -1);     /* complete close! */
 353         return;
 354     }
 355     ATENABLE(s, sp->lock);
 356     if (sp->state == sClosing) /* See if we were waiting on this write */
 357         CheckOkToClose(sp);
 358     goto top;
 359 }
 360
 361 /*
 362  * completepb delivers a paramater block with all its appropriate fields
 363  * set back to the user.
 364  *
 365  * The assumptions here are that the PB is not linked to any queue,
 366  * that the fields including ioResult are set, and that the
 367  * kernel is no longer interested in the mblks that may or
 368  * maynot be linked to this pb.
 369  */
 370 void completepb(sp, pb)
 371     register CCBPtr sp;
 372     register struct adspcmd *pb;
 373 {
 374     if (sp->gref && (sp->gref->info == (caddr_t)sp->sp_mp)) {
 375         if (gbuf_len(pb->mp) > sizeof(struct adspcmd))
 376                 gbuf_wset(pb->mp,sizeof(struct adspcmd));
 377         SndMsgUp(sp->gref, pb->mp);
 378         NotifyUser(sp);
 379     } else
 380         gbuf_freem(pb->mp);
 381 }
 382
 383 attachData(sp, mp)
 384     register CCBPtr sp;
 385     register gbuf_t *mp;
 386 {
 387     int seq;
 388     int cnt;
 389     char eom = 0;
 390     int bsize;
 391     int diff;
 392     char sendAckReq;
 393     int partial = 0;            /* flag for a partial send */
 394     int tcnt = 0;
 395     register gbuf_t *smp;       /* send data message block */
 396     register gbuf_t *psmp;      /* previous message block */
 397
 398     sendAckReq = 0;
 399
 400     if (LT(sp->sendSeq, sp->firstRtmtSeq)) /* Sanity check on send seq */
 401         sp->sendSeq = sp->firstRtmtSeq; /* seq must be oldest in buffer. */
 402
 403     /* This test and assignment was necessary because the retry VBL could
 404      * have fired and reset send Seq to first Rtmt Seq, and then an
 405      * expected ACK comes in that bumps first Rtmt Seq up.  Then we
 406      * have the problem that send Seq is less than first Rtmt Seq.
 407      * The easiest fix to this timing dilemma seems to be to reset
 408      * sendSeq to first Rtmt Seq if we're sending the first packet.
 409      */
 410     UAL_ASSIGN(sp->f.pktFirstByteSeq, netdw(sp->sendSeq));
 411
 412     if (smp = sp->sbuf_mb) /* Get oldest header */
 413         eom = 1;
 414     else if (smp = sp->csbuf_mb)
 415         eom = 0;
 416
 417     if (smp == 0) {             /* this shouldn't happen... */
 418             sp->sData = 0;
 419             return 0;
 420     }
 421     /*
 422      * Must find next byte to transmit
 423      */
 424     seq = sp->firstRtmtSeq;     /* Seq # of oldest in buffer */
 425     while ((diff = (sp->sendSeq - seq)) >= ((bsize = gbuf_msgsize(smp)) + eom)) {
 426         seq += bsize + eom;     /* update sequence # */
 427         if (gbuf_next(smp)) { /* if another send buffer */
 428             smp = gbuf_next(smp);
 429             eom = 1;
 430         } else if (smp == sp->csbuf_mb) { /* seen the current one? */
 431             smp = 0;
 432             break;
 433         } else if (sp->csbuf_mb) { /* look at it */
 434             smp = sp->csbuf_mb;
 435             eom = 0;
 436         } else {                /* no more buffers */
 437             smp = 0;
 438             break;
 439         }
 440     }                   /* while */
 441
 442     if (smp) {
 443         if (gbuf_next(smp) == 0)        /* last block */
 444             sendAckReq = 1;
 445         cnt = bsize - diff;     /* # of bytes in this block */
 446     } else
 447         cnt = 0;
 448
 449     /*
 450      * Check to see if the number of bytes is less than the 'send
 451      * Blocking' setting. If so, then we won't send this data unless
 452      * we're flushing.  So we set up a timer to force a flush later.
 453      */
 454     if ((cnt < sp->sendBlocking) && !sp->writeFlush) {
 455         InsertTimerElem(&adspGlobal.fastTimers, &sp->FlushTimer,
 456                                                  sp->sendInterval);
 457         return 0;               /* no data to send */
 458     }
 459
 460     if (cnt > ADSP_MAX_DATA_LEN) { /* truncate to one packet */
 461         cnt = ADSP_MAX_DATA_LEN;
 462         eom = 0;
 463         sendAckReq = 0; /* Won't send ack because end of data */
 464         partial++;
 465     }
 466
 467     if (smp) {
 468         /* trim extra bytes off the beginning of the "block" before the copy */
 469         while (diff) {
 470             if (gbuf_len(smp) > diff)
 471                 break;
 472             else
 473                 diff -= gbuf_len(smp);
 474             smp = gbuf_cont(smp);
 475         }
 476         if((gbuf_cont(mp) = gbuf_dupm(smp)) == 0) /* copy the data */
 477             return 0;
 478         smp = gbuf_cont(mp);    /* use the new message blocks */
 479         gbuf_rinc(smp,diff);    /* and get to the first byte of data to send */
 480     }
 481     /*
 482      * Check to see if this many bytes will close the other end's
 483      * receive window. If so, we need to send an ack request along
 484      * with this.  sendWdwSeq is the seq # of the last byte that
 485      * the remote has room for
 486      */
 487     if ((diff = sp->sendWdwSeq + 1 - sp->sendSeq) <= cnt) {
 488         if (diff < cnt) { /* Won't fit exactly */
 489             eom = 0;    /* so can't send EOM */
 490             cnt = diff;
 491             partial++;
 492         }
 493         sendAckReq = 1;         /* Make him tell us new recv. window */
 494         sp->noXmitFlow = 1;     /* Don't do flow control calc. */
 495     }
 496
 497     /* trim extra bytes off the tail of the "block" after the copy */
 498     if (partial && smp) {
 499         psmp = smp;
 500         tcnt = cnt;
 501         while (tcnt && smp) { /* while there are message blocks and data */
 502             if (tcnt >= gbuf_len(smp)) {
 503                 tcnt -= gbuf_len(smp);
 504                 if (tcnt) {
 505                     psmp = smp;
 506                     smp = gbuf_cont(smp);
 507                 } else {
 508                     if (psmp != smp) { /* not the first item on the list */
 509                         gbuf_cont(psmp) = 0;
 510                         gbuf_freem(smp);
 511                         smp = psmp;
 512                     } else {
 513                         gbuf_freem(gbuf_cont(smp));
 514                         gbuf_cont(smp) = 0;
 515                     }
 516                     break;
 517                 }
 518             } else {
 519                 gbuf_wset(smp,tcnt);
 520                 if (gbuf_cont(smp)) {
 521                     gbuf_freem(gbuf_cont(smp));
 522                     gbuf_cont(smp) = 0;
 523                 }
 524                 break;
 525             }
 526         }
 527     }
 528
 529     sp->sendSeq += cnt + eom;   /* Update sendSeq field */
 530
 531     if (GT(sp->sendSeq, sp->maxSendSeq)) /* Keep track of >st ever sent */
 532         sp->maxSendSeq = sp->sendSeq;
 533
 534     if (eom)
 535         sp->f.descriptor = ADSP_EOM_BIT;
 536     else
 537         sp->f.descriptor = 0;
 538
 539     if (sendAckReq || (++sp->pktSendCnt >= sp->pktSendMax)) {
 540         /* Last packet in a series */
 541         sp->f.descriptor |= ADSP_ACK_REQ_BIT; /* We want an ack to this */
 542         sp->waitingAck = 1;     /* Flag that we're waiting */
 543         sp->sendStamp = SysTicks(); /* Save time we sent request */
 544         sp->timerSeq = sp->sendSeq; /* Save seq # we want acked */
 545         InsertTimerElem(&adspGlobal.fastTimers, &sp->RetryTimer,
 546                         sp->rtmtInterval+TX_DLY);
 547     }
 548     return cnt + eom;
 549 }
 550
 551
 552