[apple/xnu.git] / bsd / netat / adsp_Read.c

/*
 * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
 * 
 * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code 
 * as defined in and that are subject to the Apple Public Source License 
 * Version 2.0 (the 'License'). You may not use this file except in 
 * compliance with the License.  The rights granted to you under the 
 * License may not be used to create, or enable the creation or 
 * redistribution of, unlawful or unlicensed copies of an Apple operating 
 * system, or to circumvent, violate, or enable the circumvention or 
 * violation of, any terms of an Apple operating system software license 
 * agreement.
 *
 * Please obtain a copy of the License at 
 * http://www.opensource.apple.com/apsl/ and read it before using this 
 * file.
 *
 * The Original Code and all software distributed under the License are 
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * Please see the License for the specific language governing rights and 
 * limitations under the License.
 *
 * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
 */
/*
 *
 * dspRead.c 
 *
 * From v01.17 08/22/90 mbs
 *    Modified for MP, 1996 by Tuyen Nguyen
 *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
 */

#include <sys/errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <machine/spl.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/filedesc.h>
#include <sys/fcntl.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>

#include <netat/sysglue.h>
#include <netat/appletalk.h>
#include <netat/at_pcb.h>
#include <netat/debug.h>
#include <netat/adsp.h>
#include <netat/adsp_internal.h>

/*
 * CheckReadQueue
 *
 * Checks to see if there is any data in the receive queue.  If there
 * is data, a pb and the data are queued to the user.
 * 
 * 	
 */
extern int adsp_check;

int CheckReadQueue(sp)		/* (CCBPtr sp) */
    register CCBPtr sp;
{
    register struct adspcmd *pb;
    int s;
    unsigned short cnt;
    char eom = 0;
    register gbuf_t *mp;
    register gbuf_t *tmp;
    gref_t *gref;
	
    dPrintf(D_M_ADSP, D_L_TRACE, ("CheckReadQueue: sp=0x%x\n", (unsigned)sp));
    KERNEL_DEBUG(DBG_ADSP_READ, 0, sp, sp->rbuf_mb, sp->rpb, sp->delay);
    trace_mbufs(D_M_ADSP_LOW, "    bCQR m", sp->rbuf_mb);
    ATDISABLE(s, sp->lock);

    while (sp->rData && (pb = sp->rpb)) {		/* have data */
        dPrintf(D_M_ADSP, D_L_TRACE, 
		 (" pb=0x%x, gref=0x%x, ioc=0x%x, reqCount=%d (have data)\n", 
		  pb, pb->gref, pb->ioc, pb->u.ioParams.reqCount));
    	KERNEL_DEBUG(DBG_ADSP_READ, 1, pb, pb->gref, pb->ioc, pb->u.ioParams.reqCount);
	if (pb->u.ioParams.reqCount == 0) {
	    pb->ioResult = 0;
	    sp->rpb = pb->qLink;
	    if (pb->ioc) {
    		KERNEL_DEBUG(DBG_ADSP_READ, 2, pb, pb->gref, pb->ioc, 0); 
		adspioc_ack(0, pb->ioc, pb->gref);
	    } else {
    		KERNEL_DEBUG(DBG_ADSP_READ, 3, pb, pb->gref, 0, 0);
		completepb(sp, pb);
	    }
	    continue;
	}
	    
	/* take the first packet off of sp->rbuf_mb or sp->crbuf_mb */
	if (mp = sp->rbuf_mb) {	/* Get header for oldest data */
    	    KERNEL_DEBUG(DBG_ADSP_READ, 4, pb, mp, gbuf_msgsize(mp), gbuf_next(mp));
	    sp->rbuf_mb = gbuf_next(mp);
	    gbuf_next(mp) = 0;
	    eom = 1;
	} else if (mp = sp->crbuf_mb) {
    	    KERNEL_DEBUG(DBG_ADSP_READ, 5, pb, mp, gbuf_msgsize(mp), gbuf_next(mp));
	    sp->crbuf_mb = 0;
	    eom = 0;
	}

	/* Get the first (reqCount-actCount) bytes and tack them onto 
	   the end of pb->mp.  If eom is set, put the remainder of the 
	   data onto the front of sp->rbuf_mb, otherwise sp->crbuf_mb. */
	cnt = gbuf_msgsize(mp);	/* # of data bytes in it. */
	if (cnt > (unsigned short)(pb->u.ioParams.reqCount - pb->u.ioParams.actCount)) {
	    cnt = pb->u.ioParams.reqCount - pb->u.ioParams.actCount;
	    /* m_split returns the tail */
	    if (!(tmp = (gbuf_t *)m_split(mp, cnt, M_DONTWAIT))) {
	    	cnt = 0;
		tmp = mp;
	    }
	    if (eom) {
		gbuf_next(tmp) = sp->rbuf_mb;
		sp->rbuf_mb = tmp;
		eom = 0;
	    } else
	    	sp->crbuf_mb = tmp;	
	}
	if (cnt) {
	    pb->u.ioParams.actCount += cnt;
	    gbuf_linkb(pb->mp, mp);
        }

	pb->u.ioParams.eom = eom;
	/*
	 * Now clean up receive buffer to remove all of the data 
	 * we just copied
	 */
	if ((sp->rbuf_mb == 0) && 
	    (sp->crbuf_mb == 0)) /* no more data blocks */
	    sp->rData = 0;
	/*
	 * If we've filled the parameter block, unlink it from read 
	 * queue and complete it. We also need to do this if the connection
	 * is closed && there is no more stuff to read.
	 */
	if (eom || (pb->u.ioParams.actCount >= pb->u.ioParams.reqCount) ||
	    ((sp->state == sClosed) && (!sp->rData)) ) {
	      /* end of message, message is full, connection
	       * is closed and all data has been delivered,
	       * or we are not to "delay" data delivery.
	       */
	    pb->ioResult = 0;
	    sp->rpb = pb->qLink; /* dequeue request */
	    if (pb->ioc) {	/* data to be delivered at the time of the */
		mp = gbuf_cont(pb->mp); /* ioctl call */
		gbuf_cont(pb->mp) = 0;
		gref = (gref_t *)pb->gref;
		adspioc_ack(0, pb->ioc, pb->gref);
		dPrintf(D_M_ADSP, D_L_TRACE, ("    (pb->ioc) mp=%x\n", mp));
    		KERNEL_DEBUG(DBG_ADSP_READ, 0x0A, pb,  mp, 
			     gbuf_next(mp), gbuf_cont(mp));
		SndMsgUp(gref, mp);
		dPrintf(D_M_ADSP, D_L_TRACE, 
			("    (data) size req=%d\n", pb->u.ioParams.actCount));
    		KERNEL_DEBUG(DBG_ADSP_READ, 0x0B, pb, pb->ioc, 
			     pb->u.ioParams.reqCount, pb->u.ioParams.actCount);
	    } else {		/* complete an queued async request */
    		KERNEL_DEBUG(DBG_ADSP_READ, 0x0C, pb, sp, 
			     pb->u.ioParams.actCount, sp->delay);
		completepb(sp, pb);
	    }
	}
    }	/* while */

    if (pb = sp->rpb) {		/* if there is an outstanding request */
        dPrintf(D_M_ADSP, D_L_TRACE, 
		 (" pb=0x%x, ioc=0x%x, reqCount=%d (no more data)\n", 
		  pb, pb->ioc, pb->u.ioParams.reqCount));
    	KERNEL_DEBUG(DBG_ADSP_READ, 0x0D, pb, pb->ioc, 
		     pb->u.ioParams.reqCount, pb->u.ioParams.actCount);

	if (sp->state == sClosed) {
	    while (pb) {
    		    KERNEL_DEBUG(DBG_ADSP_READ, 0x0E, pb, sp, pb->ioc, 0);
		    pb->ioResult = 0;
		    pb->u.ioParams.actCount = 0;
		    pb->u.ioParams.eom = 0;
		    sp->rpb = pb->qLink;
		    if (pb->ioc) {
			    adspioc_ack(0, pb->ioc, pb->gref);
		    } else {
			    completepb(sp, pb);
		    }
		    pb = sp->rpb;
	    }
	} else if (pb->ioc) {	/* if request not complete and this
				 * is an active ioctl, release user */
	    sp->rpb = pb->qLink;
	    pb->ioResult = 1;
	    tmp = gbuf_cont(pb->mp); /* detatch perhaps delayed data */
	    gbuf_cont(pb->mp) = 0;
	    if (mp = gbuf_copym(pb->mp)) { /* otherwise, duplicate user request */
    		    KERNEL_DEBUG(DBG_ADSP_READ, 0x0F, pb, sp, pb->mp, 0);
		    adspioc_ack(0, pb->ioc, pb->gref); 	/* release user */
		    pb = (struct adspcmd *)gbuf_rptr(mp); /* get new parameter block */
		    pb->ioc = 0;
		    pb->mp = mp;
		    gbuf_cont(pb->mp) = tmp; /* reattach data */
		    pb->qLink = sp->rpb; /* requeue the duplicate at the head */
		    sp->rpb = pb;
	    } else {		/* there is no data left, but no space
				 * to duplicate the parameter block, so
				 * put what must be a non EOM message 
				 * back on the current receive queue, and
				 * error out the user
				 */
    		    KERNEL_DEBUG(DBG_ADSP_READ, 0x10, pb, sp, pb->mp, 0);
		    if (tmp) {
			    sp->crbuf_mb = tmp;
			    sp->rData = 1;
		    }
		    pb->ioResult = errDSPQueueSize;
		    adspioc_ack(ENOBUFS, pb->ioc, pb->gref);
	    }
	} 
    }
    /* 
     * The receive window has opened.  If was previously closed, then we
     * need to notify the other guy that we now have room to receive more
     * data.  But, in order to cut down on lots of small data packets,
     * we'll wait until the recieve buffer  is /14 empy before telling
     * him that there's room in our receive buffer.
     */
    if (sp->rbufFull && (CalcRecvWdw(sp) > (sp->rbuflen >> 2))) {
	sp->rbufFull = 0;
	sp->sendDataAck = 1;
	sp->callSend = 1;
    }
    ATENABLE(s, sp->lock);

    KERNEL_DEBUG(DBG_ADSP_READ, 0x11, sp, 0, 0, 0);
    trace_mbufs(D_M_ADSP_LOW, "    eCQR m", sp->rbuf_mb);
    return 0;
}

/*
 * CheckAttn
 *
 * Checks to see if there is any attention data and passes the data back
 * in the passed in pb.
 * 
 * INPUTS:
 *	sp
 *	pb
 * 	
 * OUTPUTS:
 * 	
 */
int CheckAttn(sp, pb)		/* (CCBPtr sp) */
    register CCBPtr sp;
    register struct adspcmd *pb;
{
    int s;
    gbuf_t *mp;
    gref_t *gref;
	
    dPrintf(D_M_ADSP, D_L_TRACE, 
	    ("CheckAttn: sp=0x%x, pb=0x%x\n", (unsigned)sp, (unsigned)pb));

    ATDISABLE(s, sp->lock);
    if (mp = sp->attn_mb) {

	/*
	 * Deliver the attention data to the user. 
	 */
	gref = (gref_t *)pb->gref;
	pb->u.attnParams.attnSize = sp->attnSize;
	pb->u.attnParams.attnCode = sp->attnCode;
	if (!sp->attnSize) {
	    gbuf_freem(mp);
	    mp = 0;
	}
	sp->userFlags &= ~eAttention;
	/*
	 * Now clean up receive buffer to remove all of the data 
	 * we just copied
	 */
	sp->attn_mb = 0;
	pb->ioResult = 0;
    } else {
	/*
	 * No data...
	 */
	pb->u.attnParams.attnSize = 0;
	pb->u.attnParams.attnCode = 0;
	pb->ioResult = 1;	/* not done */
    }
    adspioc_ack(0, pb->ioc, pb->gref);
    if (mp) {
	SndMsgUp(gref, mp);
	}
    ATENABLE(s, sp->lock);
    return 0;
}

/*
 * adspRead
 * 
 * INPUTS:
 *	--> sp			stream pointer
 *	--> pb			user request parameter block
 *
 * OUTPUTS:
 *	<-- actCount		actual number of bytes read
 *	<-- eom			one if end-of-message, zero otherwise
 *
 * ERRORS:
 *	errRefNum		bad connection refnum
 *	errState
 *	errFwdReset		read terminated by forward reset
 *	errAborted		request aborted by Remove or Close call
 */
int adspRead(sp, pb)		/* (DSPPBPtr pb) */
    register CCBPtr sp;
    register struct adspcmd *pb;
{
    register gbuf_t *mp;
    int	s;

    dPrintf(D_M_ADSP, D_L_TRACE, 
	    ("adspRead: sp=0x%x, pb=0x%x\n", (unsigned)sp, (unsigned)pb));

    KERNEL_DEBUG(DBG_ADSP_READ, 0x12, sp, pb, sp->state, sp->rData); 

    if (sp == 0) {
	pb->ioResult = errRefNum;
	return EINVAL;
    }
	
    /*
     * It's OK to read on a closed, or closing session
     */
    ATDISABLE(s, sp->lock);
    if (sp->state != sOpen && sp->state != sClosing && sp->state != sClosed) {
	ATENABLE(s, sp->lock);
	pb->ioResult = errState;
	return EINVAL;
    }
    if (sp->rData && (sp->rpb == 0)) { /* if data, and no queue of pbs */
	qAddToEnd(&sp->rpb, pb); /* deliver data to user directly */
	ATENABLE(s, sp->lock);
	CheckReadQueue(sp);
    } else if ((pb->u.ioParams.reqCount == 0) && (sp->rpb == 0)) {
	    /* empty read */
	    ATENABLE(s, sp->lock);
	    pb->ioResult = 0;
	    adspioc_ack(0, pb->ioc, pb->gref);
	    return 0;
    } else {
	pb->ioResult = 1;
	if (mp = gbuf_copym(pb->mp)) { /* otherwise, duplicate user request */
		adspioc_ack(0, pb->ioc, pb->gref); 	/* release user */
		pb = (struct adspcmd *)gbuf_rptr(mp); 	/* get new parameter block */
		pb->ioc = 0;
		pb->mp = mp;
		qAddToEnd(&sp->rpb, pb); /* and queue it for later */
		ATENABLE(s, sp->lock);
	} else {
		ATENABLE(s, sp->lock);
		pb->ioResult = errDSPQueueSize;
		return ENOBUFS;
	}
    }

    if (sp->callSend) {
	CheckSend(sp);		/* If recv window opened, we might */
				/* send an unsolicited ACK. */
    }
    return 0;
}

/*
 * dspReadAttention
 * 
 * INPUTS:
 *	--> sp			stream pointer
 *	--> pb			user request parameter block
 *
 * OUTPUTS:
 *	<-- NONE
 *
 * ERRORS:
 *	errRefNum		bad connection refnum
 *	errState		connection is not in the right state
 */
int adspReadAttention(sp, pb)		/* (DSPPBPtr pb) */
    register CCBPtr sp;
    register struct adspcmd *pb;
{
    dPrintf(D_M_ADSP, D_L_TRACE, 
	    ("adspReadAttention: sp=0x%x, pb=0x%x\n", (unsigned)sp, (unsigned)pb));
    if (sp == 0) {
	pb->ioResult = errRefNum;
	return EINVAL;
    }
	
    /*
     * It's OK to read on a closed, or closing session
     */
    if (sp->state != sOpen && sp->state != sClosing && sp->state != sClosed) {
	pb->ioResult = errState;
	return EINVAL;
    }

    CheckAttn(sp, pb);		/* Anything in the attention queue */
    CheckReadQueue(sp);		/* check to see if receive window has opened */
    if (sp->callSend) {
	CheckSend(sp);		/* If recv window opened, we might */
				/* send an unsolicited ACK. */
	}
    return 0;
} /* adspReadAttention */
Commit	Line	Data
1c79356b	1	/*
8ad349bb	2	* Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
1c79356b	3	*
8ad349bb	4	* @APPLE_LICENSE_OSREFERENCE_HEADER_START@
1c79356b	5	*
8ad349bb A	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@
1c79356b A	29	*/
	30	/*
	31	*
	32	* dspRead.c
	33	*
	34	* From v01.17 08/22/90 mbs
	35	* Modified for MP, 1996 by Tuyen Nguyen
	36	* Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
	37	*/
	38
	39	#include <sys/errno.h>
	40	#include <sys/types.h>
	41	#include <sys/param.h>
	42	#include <machine/spl.h>
	43	#include <sys/systm.h>
	44	#include <sys/kernel.h>
	45	#include <sys/proc.h>
	46	#include <sys/filedesc.h>
	47	#include <sys/fcntl.h>
	48	#include <sys/mbuf.h>
	49	#include <sys/socket.h>
	50	#include <sys/socketvar.h>
	51
	52	#include <netat/sysglue.h>
	53	#include <netat/appletalk.h>
	54	#include <netat/at_pcb.h>
	55	#include <netat/debug.h>
	56	#include <netat/adsp.h>
	57	#include <netat/adsp_internal.h>
	58
	59	/*
	60	* CheckReadQueue
	61	*
	62	* Checks to see if there is any data in the receive queue. If there
	63	* is data, a pb and the data are queued to the user.
	64	*
	65	*
	66	*/
	67	extern int adsp_check;
	68
	69	int CheckReadQueue(sp) /* (CCBPtr sp) */
	70	register CCBPtr sp;
	71	{
	72	register struct adspcmd *pb;
8ad349bb	73	int s;
1c79356b A	74	unsigned short cnt;
	75	char eom = 0;
	76	register gbuf_t *mp;
	77	register gbuf_t *tmp;
	78	gref_t *gref;
	79
	80	dPrintf(D_M_ADSP, D_L_TRACE, ("CheckReadQueue: sp=0x%x\n", (unsigned)sp));
	81	KERNEL_DEBUG(DBG_ADSP_READ, 0, sp, sp->rbuf_mb, sp->rpb, sp->delay);
	82	trace_mbufs(D_M_ADSP_LOW, " bCQR m", sp->rbuf_mb);
8ad349bb	83	ATDISABLE(s, sp->lock);
1c79356b A	84
	85	while (sp->rData && (pb = sp->rpb)) { /* have data */
	86	dPrintf(D_M_ADSP, D_L_TRACE,
	87	(" pb=0x%x, gref=0x%x, ioc=0x%x, reqCount=%d (have data)\n",
	88	pb, pb->gref, pb->ioc, pb->u.ioParams.reqCount));
	89	KERNEL_DEBUG(DBG_ADSP_READ, 1, pb, pb->gref, pb->ioc, pb->u.ioParams.reqCount);
	90	if (pb->u.ioParams.reqCount == 0) {
	91	pb->ioResult = 0;
	92	sp->rpb = pb->qLink;
	93	if (pb->ioc) {
	94	KERNEL_DEBUG(DBG_ADSP_READ, 2, pb, pb->gref, pb->ioc, 0);
	95	adspioc_ack(0, pb->ioc, pb->gref);
	96	} else {
	97	KERNEL_DEBUG(DBG_ADSP_READ, 3, pb, pb->gref, 0, 0);
	98	completepb(sp, pb);
	99	}
	100	continue;
	101	}
	102
	103	/* take the first packet off of sp->rbuf_mb or sp->crbuf_mb */
	104	if (mp = sp->rbuf_mb) { /* Get header for oldest data */
	105	KERNEL_DEBUG(DBG_ADSP_READ, 4, pb, mp, gbuf_msgsize(mp), gbuf_next(mp));
	106	sp->rbuf_mb = gbuf_next(mp);
	107	gbuf_next(mp) = 0;
	108	eom = 1;
	109	} else if (mp = sp->crbuf_mb) {
	110	KERNEL_DEBUG(DBG_ADSP_READ, 5, pb, mp, gbuf_msgsize(mp), gbuf_next(mp));
	111	sp->crbuf_mb = 0;
	112	eom = 0;
	113	}
	114
	115	/* Get the first (reqCount-actCount) bytes and tack them onto
	116	the end of pb->mp. If eom is set, put the remainder of the
	117	data onto the front of sp->rbuf_mb, otherwise sp->crbuf_mb. */
	118	cnt = gbuf_msgsize(mp); /* # of data bytes in it. */
	119	if (cnt > (unsigned short)(pb->u.ioParams.reqCount - pb->u.ioParams.actCount)) {
	120	cnt = pb->u.ioParams.reqCount - pb->u.ioParams.actCount;
	121	/* m_split returns the tail */
	122	if (!(tmp = (gbuf_t *)m_split(mp, cnt, M_DONTWAIT))) {
	123	cnt = 0;
	124	tmp = mp;
	125	}
	126	if (eom) {
	127	gbuf_next(tmp) = sp->rbuf_mb;
	128	sp->rbuf_mb = tmp;
	129	eom = 0;
	130	} else
	131	sp->crbuf_mb = tmp;
	132	}
	133	if (cnt) {
	134	pb->u.ioParams.actCount += cnt;
	135	gbuf_linkb(pb->mp, mp);
	136	}
	137
	138	pb->u.ioParams.eom = eom;
	139	/*
	140	* Now clean up receive buffer to remove all of the data
	141	* we just copied
	142	*/
	143	if ((sp->rbuf_mb == 0) &&
	144	(sp->crbuf_mb == 0)) /* no more data blocks */
	145	sp->rData = 0;
	146	/*
	147	* If we've filled the parameter block, unlink it from read
148	* queue and complete it. We also need to do this if the connection
149	* is closed && there is no more stuff to read.
150	*/
151	if (eom \|\| (pb->u.ioParams.actCount >= pb->u.ioParams.reqCount) \|\|
152	((sp->state == sClosed) && (!sp->rData)) ) {
153	/* end of message, message is full, connection
154	* is closed and all data has been delivered,
155	* or we are not to "delay" data delivery.
156	*/
157	pb->ioResult = 0;
158	sp->rpb = pb->qLink; /* dequeue request */
159	if (pb->ioc) { /* data to be delivered at the time of the */
160	mp = gbuf_cont(pb->mp); /* ioctl call */
161	gbuf_cont(pb->mp) = 0;
162	gref = (gref_t *)pb->gref;
163	adspioc_ack(0, pb->ioc, pb->gref);
164	dPrintf(D_M_ADSP, D_L_TRACE, (" (pb->ioc) mp=%x\n", mp));
165	KERNEL_DEBUG(DBG_ADSP_READ, 0x0A, pb, mp,
166	gbuf_next(mp), gbuf_cont(mp));
167	SndMsgUp(gref, mp);
168	dPrintf(D_M_ADSP, D_L_TRACE,
169	(" (data) size req=%d\n", pb->u.ioParams.actCount));
170	KERNEL_DEBUG(DBG_ADSP_READ, 0x0B, pb, pb->ioc,
171	pb->u.ioParams.reqCount, pb->u.ioParams.actCount);
172	} else { /* complete an queued async request */
173	KERNEL_DEBUG(DBG_ADSP_READ, 0x0C, pb, sp,
174	pb->u.ioParams.actCount, sp->delay);
175	completepb(sp, pb);
176	}
177	}
178	} /* while */
179
180	if (pb = sp->rpb) { /* if there is an outstanding request */
181	dPrintf(D_M_ADSP, D_L_TRACE,
182	(" pb=0x%x, ioc=0x%x, reqCount=%d (no more data)\n",
183	pb, pb->ioc, pb->u.ioParams.reqCount));
184	KERNEL_DEBUG(DBG_ADSP_READ, 0x0D, pb, pb->ioc,
185	pb->u.ioParams.reqCount, pb->u.ioParams.actCount);
186
187	if (sp->state == sClosed) {
188	while (pb) {
189	KERNEL_DEBUG(DBG_ADSP_READ, 0x0E, pb, sp, pb->ioc, 0);
190	pb->ioResult = 0;
191	pb->u.ioParams.actCount = 0;
192	pb->u.ioParams.eom = 0;
193	sp->rpb = pb->qLink;
194	if (pb->ioc) {
195	adspioc_ack(0, pb->ioc, pb->gref);
196	} else {
197	completepb(sp, pb);
198	}
199	pb = sp->rpb;
200	}
201	} else if (pb->ioc) { /* if request not complete and this
202	* is an active ioctl, release user */
203	sp->rpb = pb->qLink;
204	pb->ioResult = 1;
205	tmp = gbuf_cont(pb->mp); /* detatch perhaps delayed data */
206	gbuf_cont(pb->mp) = 0;
207	if (mp = gbuf_copym(pb->mp)) { /* otherwise, duplicate user request */
208	KERNEL_DEBUG(DBG_ADSP_READ, 0x0F, pb, sp, pb->mp, 0);
209	adspioc_ack(0, pb->ioc, pb->gref); /* release user */
210	pb = (struct adspcmd )gbuf_rptr(mp); / get new parameter block */
211	pb->ioc = 0;
212	pb->mp = mp;
213	gbuf_cont(pb->mp) = tmp; /* reattach data */
214	pb->qLink = sp->rpb; /* requeue the duplicate at the head */
215	sp->rpb = pb;
216	} else { /* there is no data left, but no space
217	* to duplicate the parameter block, so
218	* put what must be a non EOM message
219	* back on the current receive queue, and
220	* error out the user
221	*/
222	KERNEL_DEBUG(DBG_ADSP_READ, 0x10, pb, sp, pb->mp, 0);
223	if (tmp) {
224	sp->crbuf_mb = tmp;
225	sp->rData = 1;
226	}
227	pb->ioResult = errDSPQueueSize;
228	adspioc_ack(ENOBUFS, pb->ioc, pb->gref);
229	}
230	}
231	}
232	/*
233	* The receive window has opened. If was previously closed, then we
234	* need to notify the other guy that we now have room to receive more
235	* data. But, in order to cut down on lots of small data packets,
236	* we'll wait until the recieve buffer is /14 empy before telling
237	* him that there's room in our receive buffer.
238	*/
239	if (sp->rbufFull && (CalcRecvWdw(sp) > (sp->rbuflen >> 2))) {
240	sp->rbufFull = 0;
241	sp->sendDataAck = 1;
242	sp->callSend = 1;
243	}
8ad349bb	244	ATENABLE(s, sp->lock);
1c79356b A	245
	246	KERNEL_DEBUG(DBG_ADSP_READ, 0x11, sp, 0, 0, 0);
	247	trace_mbufs(D_M_ADSP_LOW, " eCQR m", sp->rbuf_mb);
	248	return 0;
	249	}
	250
	251	/*
	252	* CheckAttn
	253	*
	254	* Checks to see if there is any attention data and passes the data back
	255	* in the passed in pb.
	256	*
	257	* INPUTS:
	258	* sp
	259	* pb
	260	*
	261	* OUTPUTS:
	262	*
	263	*/
	264	int CheckAttn(sp, pb) /* (CCBPtr sp) */
	265	register CCBPtr sp;
	266	register struct adspcmd *pb;
	267	{
8ad349bb	268	int s;
1c79356b A	269	gbuf_t *mp;
	270	gref_t *gref;
	271
	272	dPrintf(D_M_ADSP, D_L_TRACE,
	273	("CheckAttn: sp=0x%x, pb=0x%x\n", (unsigned)sp, (unsigned)pb));
	274
8ad349bb	275	ATDISABLE(s, sp->lock);
1c79356b A	276	if (mp = sp->attn_mb) {
	277
	278	/*
	279	* Deliver the attention data to the user.
	280	*/
	281	gref = (gref_t *)pb->gref;
	282	pb->u.attnParams.attnSize = sp->attnSize;
	283	pb->u.attnParams.attnCode = sp->attnCode;
	284	if (!sp->attnSize) {
	285	gbuf_freem(mp);
	286	mp = 0;
	287	}
	288	sp->userFlags &= ~eAttention;
	289	/*
	290	* Now clean up receive buffer to remove all of the data
	291	* we just copied
	292	*/
	293	sp->attn_mb = 0;
	294	pb->ioResult = 0;
	295	} else {
	296	/*
	297	* No data...
	298	*/
	299	pb->u.attnParams.attnSize = 0;
	300	pb->u.attnParams.attnCode = 0;
	301	pb->ioResult = 1; /* not done */
	302	}
	303	adspioc_ack(0, pb->ioc, pb->gref);
	304	if (mp) {
	305	SndMsgUp(gref, mp);
	306	}
8ad349bb	307	ATENABLE(s, sp->lock);
1c79356b A	308	return 0;
	309	}
	310
	311	/*
	312	* adspRead
	313	*
	314	* INPUTS:
	315	* --> sp stream pointer
	316	* --> pb user request parameter block
	317	*
	318	* OUTPUTS:
	319	* <-- actCount actual number of bytes read
	320	* <-- eom one if end-of-message, zero otherwise
	321	*
	322	* ERRORS:
	323	* errRefNum bad connection refnum
	324	* errState
	325	* errFwdReset read terminated by forward reset
	326	* errAborted request aborted by Remove or Close call
	327	*/
	328	int adspRead(sp, pb) /* (DSPPBPtr pb) */
	329	register CCBPtr sp;
	330	register struct adspcmd *pb;
	331	{
	332	register gbuf_t *mp;
8ad349bb	333	int s;
1c79356b A	334
	335	dPrintf(D_M_ADSP, D_L_TRACE,
	336	("adspRead: sp=0x%x, pb=0x%x\n", (unsigned)sp, (unsigned)pb));
	337
	338	KERNEL_DEBUG(DBG_ADSP_READ, 0x12, sp, pb, sp->state, sp->rData);
	339
	340	if (sp == 0) {
	341	pb->ioResult = errRefNum;
	342	return EINVAL;
	343	}
	344
	345	/*
	346	* It's OK to read on a closed, or closing session
	347	*/
8ad349bb	348	ATDISABLE(s, sp->lock);
1c79356b	349	if (sp->state != sOpen && sp->state != sClosing && sp->state != sClosed) {
8ad349bb	350	ATENABLE(s, sp->lock);
1c79356b A	351	pb->ioResult = errState;
	352	return EINVAL;
	353	}
	354	if (sp->rData && (sp->rpb == 0)) { /* if data, and no queue of pbs */
	355	qAddToEnd(&sp->rpb, pb); /* deliver data to user directly */
8ad349bb	356	ATENABLE(s, sp->lock);
1c79356b A	357	CheckReadQueue(sp);
	358	} else if ((pb->u.ioParams.reqCount == 0) && (sp->rpb == 0)) {
	359	/* empty read */
8ad349bb	360	ATENABLE(s, sp->lock);
1c79356b A	361	pb->ioResult = 0;
	362	adspioc_ack(0, pb->ioc, pb->gref);
	363	return 0;
	364	} else {
	365	pb->ioResult = 1;
	366	if (mp = gbuf_copym(pb->mp)) { /* otherwise, duplicate user request */
	367	adspioc_ack(0, pb->ioc, pb->gref); /* release user */
	368	pb = (struct adspcmd )gbuf_rptr(mp); / get new parameter block */
	369	pb->ioc = 0;
	370	pb->mp = mp;
	371	qAddToEnd(&sp->rpb, pb); /* and queue it for later */
8ad349bb	372	ATENABLE(s, sp->lock);
1c79356b	373	} else {
8ad349bb	374	ATENABLE(s, sp->lock);
1c79356b A	375	pb->ioResult = errDSPQueueSize;
	376	return ENOBUFS;
	377	}
	378	}
	379
	380	if (sp->callSend) {
	381	CheckSend(sp); /* If recv window opened, we might */
	382	/* send an unsolicited ACK. */
	383	}
	384	return 0;
	385	}
	386
	387	/*
	388	* dspReadAttention
	389	*
	390	* INPUTS:
	391	* --> sp stream pointer
	392	* --> pb user request parameter block
	393	*
	394	* OUTPUTS:
	395	* <-- NONE
	396	*
	397	* ERRORS:
	398	* errRefNum bad connection refnum
	399	* errState connection is not in the right state
	400	*/
	401	int adspReadAttention(sp, pb) /* (DSPPBPtr pb) */
	402	register CCBPtr sp;
	403	register struct adspcmd *pb;
	404	{
	405	dPrintf(D_M_ADSP, D_L_TRACE,
	406	("adspReadAttention: sp=0x%x, pb=0x%x\n", (unsigned)sp, (unsigned)pb));
	407	if (sp == 0) {
	408	pb->ioResult = errRefNum;
	409	return EINVAL;
	410	}
	411
	412	/*
	413	* It's OK to read on a closed, or closing session
	414	*/
	415	if (sp->state != sOpen && sp->state != sClosing && sp->state != sClosed) {
	416	pb->ioResult = errState;
	417	return EINVAL;
	418	}
	419
	420	CheckAttn(sp, pb); /* Anything in the attention queue */
	421	CheckReadQueue(sp); /* check to see if receive window has opened */
	422	if (sp->callSend) {
	423	CheckSend(sp); /* If recv window opened, we might */
	424	/* send an unsolicited ACK. */
	425	}
	426	return 0;
	427	} /* adspReadAttention */