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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_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. 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_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 A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
ff6e181a 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. Please obtain a copy of the License at
	10	* http://www.opensource.apple.com/apsl/ and read it before using this
	11	* file.
1c79356b	12	*
ff6e181a A	13	* The Original Code and all software distributed under the License are
ff6e181a A	14	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	15	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	16	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
ff6e181a A	17	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	18	* Please see the License for the specific language governing rights and
	19	* limitations under the License.
1c79356b A	20	*
	21	* @APPLE_LICENSE_HEADER_END@
	22	*/
	23	/*
	24	*
	25	* dspRead.c
	26	*
	27	* From v01.17 08/22/90 mbs
	28	* Modified for MP, 1996 by Tuyen Nguyen
	29	* Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
	30	*/
	31
	32	#include <sys/errno.h>
	33	#include <sys/types.h>
	34	#include <sys/param.h>
	35	#include <machine/spl.h>
	36	#include <sys/systm.h>
	37	#include <sys/kernel.h>
	38	#include <sys/proc.h>
	39	#include <sys/filedesc.h>
	40	#include <sys/fcntl.h>
	41	#include <sys/mbuf.h>
	42	#include <sys/socket.h>
	43	#include <sys/socketvar.h>
	44
	45	#include <netat/sysglue.h>
	46	#include <netat/appletalk.h>
	47	#include <netat/at_pcb.h>
	48	#include <netat/debug.h>
	49	#include <netat/adsp.h>
	50	#include <netat/adsp_internal.h>
	51
	52	/*
	53	* CheckReadQueue
	54	*
	55	* Checks to see if there is any data in the receive queue. If there
	56	* is data, a pb and the data are queued to the user.
	57	*
	58	*
	59	*/
	60	extern int adsp_check;
	61
	62	int CheckReadQueue(sp) /* (CCBPtr sp) */
	63	register CCBPtr sp;
	64	{
	65	register struct adspcmd *pb;
	66	int s;
	67	unsigned short cnt;
	68	char eom = 0;
	69	register gbuf_t *mp;
	70	register gbuf_t *tmp;
	71	gref_t *gref;
	72
	73	dPrintf(D_M_ADSP, D_L_TRACE, ("CheckReadQueue: sp=0x%x\n", (unsigned)sp));
	74	KERNEL_DEBUG(DBG_ADSP_READ, 0, sp, sp->rbuf_mb, sp->rpb, sp->delay);
	75	trace_mbufs(D_M_ADSP_LOW, " bCQR m", sp->rbuf_mb);
	76	ATDISABLE(s, sp->lock);
	77
	78	while (sp->rData && (pb = sp->rpb)) { /* have data */
	79	dPrintf(D_M_ADSP, D_L_TRACE,
	80	(" pb=0x%x, gref=0x%x, ioc=0x%x, reqCount=%d (have data)\n",
	81	pb, pb->gref, pb->ioc, pb->u.ioParams.reqCount));
	82	KERNEL_DEBUG(DBG_ADSP_READ, 1, pb, pb->gref, pb->ioc, pb->u.ioParams.reqCount);
	83	if (pb->u.ioParams.reqCount == 0) {
84	pb->ioResult = 0;
85	sp->rpb = pb->qLink;
86	if (pb->ioc) {
87	KERNEL_DEBUG(DBG_ADSP_READ, 2, pb, pb->gref, pb->ioc, 0);
88	adspioc_ack(0, pb->ioc, pb->gref);
89	} else {
90	KERNEL_DEBUG(DBG_ADSP_READ, 3, pb, pb->gref, 0, 0);
91	completepb(sp, pb);
92	}
93	continue;
94	}
95
96	/* take the first packet off of sp->rbuf_mb or sp->crbuf_mb */
97	if (mp = sp->rbuf_mb) { /* Get header for oldest data */
98	KERNEL_DEBUG(DBG_ADSP_READ, 4, pb, mp, gbuf_msgsize(mp), gbuf_next(mp));
99	sp->rbuf_mb = gbuf_next(mp);
100	gbuf_next(mp) = 0;
101	eom = 1;
102	} else if (mp = sp->crbuf_mb) {
103	KERNEL_DEBUG(DBG_ADSP_READ, 5, pb, mp, gbuf_msgsize(mp), gbuf_next(mp));
104	sp->crbuf_mb = 0;
105	eom = 0;
106	}
107
108	/* Get the first (reqCount-actCount) bytes and tack them onto
109	the end of pb->mp. If eom is set, put the remainder of the
110	data onto the front of sp->rbuf_mb, otherwise sp->crbuf_mb. */
111	cnt = gbuf_msgsize(mp); /* # of data bytes in it. */
112	if (cnt > (unsigned short)(pb->u.ioParams.reqCount - pb->u.ioParams.actCount)) {
113	cnt = pb->u.ioParams.reqCount - pb->u.ioParams.actCount;
114	/* m_split returns the tail */
115	if (!(tmp = (gbuf_t *)m_split(mp, cnt, M_DONTWAIT))) {
116	cnt = 0;
117	tmp = mp;
118	}
119	if (eom) {
120	gbuf_next(tmp) = sp->rbuf_mb;
121	sp->rbuf_mb = tmp;
122	eom = 0;
123	} else
124	sp->crbuf_mb = tmp;
125	}
126	if (cnt) {
127	pb->u.ioParams.actCount += cnt;
128	gbuf_linkb(pb->mp, mp);
129	}
130
131	pb->u.ioParams.eom = eom;
132	/*
133	* Now clean up receive buffer to remove all of the data
134	* we just copied
135	*/
136	if ((sp->rbuf_mb == 0) &&
137	(sp->crbuf_mb == 0)) /* no more data blocks */
138	sp->rData = 0;
139	/*
140	* If we've filled the parameter block, unlink it from read
141	* queue and complete it. We also need to do this if the connection
142	* is closed && there is no more stuff to read.
143	*/
144	if (eom \|\| (pb->u.ioParams.actCount >= pb->u.ioParams.reqCount) \|\|
145	((sp->state == sClosed) && (!sp->rData)) ) {
146	/* end of message, message is full, connection
147	* is closed and all data has been delivered,
148	* or we are not to "delay" data delivery.
149	*/
150	pb->ioResult = 0;
151	sp->rpb = pb->qLink; /* dequeue request */
152	if (pb->ioc) { /* data to be delivered at the time of the */
153	mp = gbuf_cont(pb->mp); /* ioctl call */
154	gbuf_cont(pb->mp) = 0;
155	gref = (gref_t *)pb->gref;
156	adspioc_ack(0, pb->ioc, pb->gref);
157	dPrintf(D_M_ADSP, D_L_TRACE, (" (pb->ioc) mp=%x\n", mp));
158	KERNEL_DEBUG(DBG_ADSP_READ, 0x0A, pb, mp,
159	gbuf_next(mp), gbuf_cont(mp));
160	SndMsgUp(gref, mp);
161	dPrintf(D_M_ADSP, D_L_TRACE,
162	(" (data) size req=%d\n", pb->u.ioParams.actCount));
163	KERNEL_DEBUG(DBG_ADSP_READ, 0x0B, pb, pb->ioc,
164	pb->u.ioParams.reqCount, pb->u.ioParams.actCount);
165	} else { /* complete an queued async request */
166	KERNEL_DEBUG(DBG_ADSP_READ, 0x0C, pb, sp,
167	pb->u.ioParams.actCount, sp->delay);
168	completepb(sp, pb);
169	}
170	}
171	} /* while */
172
173	if (pb = sp->rpb) { /* if there is an outstanding request */
174	dPrintf(D_M_ADSP, D_L_TRACE,
175	(" pb=0x%x, ioc=0x%x, reqCount=%d (no more data)\n",
176	pb, pb->ioc, pb->u.ioParams.reqCount));
177	KERNEL_DEBUG(DBG_ADSP_READ, 0x0D, pb, pb->ioc,
178	pb->u.ioParams.reqCount, pb->u.ioParams.actCount);
179
180	if (sp->state == sClosed) {
181	while (pb) {
182	KERNEL_DEBUG(DBG_ADSP_READ, 0x0E, pb, sp, pb->ioc, 0);
183	pb->ioResult = 0;
184	pb->u.ioParams.actCount = 0;
185	pb->u.ioParams.eom = 0;
186	sp->rpb = pb->qLink;
187	if (pb->ioc) {
188	adspioc_ack(0, pb->ioc, pb->gref);
189	} else {
190	completepb(sp, pb);
191	}
192	pb = sp->rpb;
193	}
194	} else if (pb->ioc) { /* if request not complete and this
195	* is an active ioctl, release user */
196	sp->rpb = pb->qLink;
197	pb->ioResult = 1;
198	tmp = gbuf_cont(pb->mp); /* detatch perhaps delayed data */
199	gbuf_cont(pb->mp) = 0;
200	if (mp = gbuf_copym(pb->mp)) { /* otherwise, duplicate user request */
201	KERNEL_DEBUG(DBG_ADSP_READ, 0x0F, pb, sp, pb->mp, 0);
202	adspioc_ack(0, pb->ioc, pb->gref); /* release user */
203	pb = (struct adspcmd )gbuf_rptr(mp); / get new parameter block */
204	pb->ioc = 0;
205	pb->mp = mp;
206	gbuf_cont(pb->mp) = tmp; /* reattach data */
207	pb->qLink = sp->rpb; /* requeue the duplicate at the head */
208	sp->rpb = pb;
209	} else { /* there is no data left, but no space
210	* to duplicate the parameter block, so
211	* put what must be a non EOM message
212	* back on the current receive queue, and
213	* error out the user
214	*/
215	KERNEL_DEBUG(DBG_ADSP_READ, 0x10, pb, sp, pb->mp, 0);
216	if (tmp) {
217	sp->crbuf_mb = tmp;
218	sp->rData = 1;
219	}
220	pb->ioResult = errDSPQueueSize;
221	adspioc_ack(ENOBUFS, pb->ioc, pb->gref);
222	}
223	}
224	}
225	/*
226	* The receive window has opened. If was previously closed, then we
227	* need to notify the other guy that we now have room to receive more
228	* data. But, in order to cut down on lots of small data packets,
229	* we'll wait until the recieve buffer is /14 empy before telling
230	* him that there's room in our receive buffer.
231	*/
232	if (sp->rbufFull && (CalcRecvWdw(sp) > (sp->rbuflen >> 2))) {
233	sp->rbufFull = 0;
234	sp->sendDataAck = 1;
235	sp->callSend = 1;
236	}
237	ATENABLE(s, sp->lock);
238
239	KERNEL_DEBUG(DBG_ADSP_READ, 0x11, sp, 0, 0, 0);
240	trace_mbufs(D_M_ADSP_LOW, " eCQR m", sp->rbuf_mb);
241	return 0;
242	}
243
244	/*
245	* CheckAttn
246	*
247	* Checks to see if there is any attention data and passes the data back
248	* in the passed in pb.
249	*
250	* INPUTS:
251	* sp
252	* pb
253	*
254	* OUTPUTS:
255	*
256	*/
257	int CheckAttn(sp, pb) /* (CCBPtr sp) */
258	register CCBPtr sp;
259	register struct adspcmd *pb;
260	{
261	int s;
262	gbuf_t *mp;
263	gref_t *gref;
264
265	dPrintf(D_M_ADSP, D_L_TRACE,
266	("CheckAttn: sp=0x%x, pb=0x%x\n", (unsigned)sp, (unsigned)pb));
267
268	ATDISABLE(s, sp->lock);
269	if (mp = sp->attn_mb) {
270
271	/*
272	* Deliver the attention data to the user.
273	*/
274	gref = (gref_t *)pb->gref;
275	pb->u.attnParams.attnSize = sp->attnSize;
276	pb->u.attnParams.attnCode = sp->attnCode;
277	if (!sp->attnSize) {
278	gbuf_freem(mp);
279	mp = 0;
280	}
281	sp->userFlags &= ~eAttention;
282	/*
283	* Now clean up receive buffer to remove all of the data
284	* we just copied
285	*/
286	sp->attn_mb = 0;
287	pb->ioResult = 0;
288	} else {
289	/*
290	* No data...
291	*/
292	pb->u.attnParams.attnSize = 0;
293	pb->u.attnParams.attnCode = 0;
294	pb->ioResult = 1; /* not done */
295	}
296	adspioc_ack(0, pb->ioc, pb->gref);
297	if (mp) {
298	SndMsgUp(gref, mp);
299	}
300	ATENABLE(s, sp->lock);
301	return 0;
302	}
303
304	/*
305	* adspRead
306	*
307	* INPUTS:
308	* --> sp stream pointer
309	* --> pb user request parameter block
310	*
311	* OUTPUTS:
312	* <-- actCount actual number of bytes read
313	* <-- eom one if end-of-message, zero otherwise
314	*
315	* ERRORS:
316	* errRefNum bad connection refnum
317	* errState
318	* errFwdReset read terminated by forward reset
319	* errAborted request aborted by Remove or Close call
320	*/
321	int adspRead(sp, pb) /* (DSPPBPtr pb) */
322	register CCBPtr sp;
323	register struct adspcmd *pb;
324	{
325	register gbuf_t *mp;
326	int s;
327
328	dPrintf(D_M_ADSP, D_L_TRACE,
329	("adspRead: sp=0x%x, pb=0x%x\n", (unsigned)sp, (unsigned)pb));
330
331	KERNEL_DEBUG(DBG_ADSP_READ, 0x12, sp, pb, sp->state, sp->rData);
332
333	if (sp == 0) {
334	pb->ioResult = errRefNum;
335	return EINVAL;
336	}
337
338	/*
339	* It's OK to read on a closed, or closing session
340	*/
341	ATDISABLE(s, sp->lock);
342	if (sp->state != sOpen && sp->state != sClosing && sp->state != sClosed) {
343	ATENABLE(s, sp->lock);
344	pb->ioResult = errState;
345	return EINVAL;
346	}
347	if (sp->rData && (sp->rpb == 0)) { /* if data, and no queue of pbs */
348	qAddToEnd(&sp->rpb, pb); /* deliver data to user directly */
349	ATENABLE(s, sp->lock);
350	CheckReadQueue(sp);
351	} else if ((pb->u.ioParams.reqCount == 0) && (sp->rpb == 0)) {
352	/* empty read */
353	ATENABLE(s, sp->lock);
354	pb->ioResult = 0;
355	adspioc_ack(0, pb->ioc, pb->gref);
356	return 0;
357	} else {
358	pb->ioResult = 1;
359	if (mp = gbuf_copym(pb->mp)) { /* otherwise, duplicate user request */
360	adspioc_ack(0, pb->ioc, pb->gref); /* release user */
361	pb = (struct adspcmd )gbuf_rptr(mp); / get new parameter block */
362	pb->ioc = 0;
363	pb->mp = mp;
364	qAddToEnd(&sp->rpb, pb); /* and queue it for later */
365	ATENABLE(s, sp->lock);
366	} else {
367	ATENABLE(s, sp->lock);
368	pb->ioResult = errDSPQueueSize;
369	return ENOBUFS;
370	}
371	}
372
373	if (sp->callSend) {
374	CheckSend(sp); /* If recv window opened, we might */
375	/* send an unsolicited ACK. */
376	}
377	return 0;
378	}
379
380	/*
381	* dspReadAttention
382	*
383	* INPUTS:
384	* --> sp stream pointer
385	* --> pb user request parameter block
386	*
387	* OUTPUTS:
388	* <-- NONE
389	*
390	* ERRORS:
391	* errRefNum bad connection refnum
392	* errState connection is not in the right state
393	*/
394	int adspReadAttention(sp, pb) /* (DSPPBPtr pb) */
395	register CCBPtr sp;
396	register struct adspcmd *pb;
397	{
398	dPrintf(D_M_ADSP, D_L_TRACE,
399	("adspReadAttention: sp=0x%x, pb=0x%x\n", (unsigned)sp, (unsigned)pb));
400	if (sp == 0) {
401	pb->ioResult = errRefNum;
402	return EINVAL;
403	}
404
405	/*
406	* It's OK to read on a closed, or closing session
407	*/
408	if (sp->state != sOpen && sp->state != sClosing && sp->state != sClosed) {
409	pb->ioResult = errState;
410	return EINVAL;
411	}
412
413	CheckAttn(sp, pb); /* Anything in the attention queue */
414	CheckReadQueue(sp); /* check to see if receive window has opened */
415	if (sp->callSend) {
416	CheckSend(sp); /* If recv window opened, we might */
417	/* send an unsolicited ACK. */
418	}
419	return 0;
420	} /* adspReadAttention */