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Move status reads to chopen- there's no need to hang up the boot
process finding out the changer parameters.

Print out changer parameters only if they're changed from the last
read of changer parameters. This works for the first time, and for
99.9% of all other cases will be silent ever after. The only time
this will then be chatty afterwards is if you change something
within the changer (add a drive, etc.).

/*	$OpenBSD: ch.c,v 1.10 2001/03/15 20:08:43 mjacob Exp $	*/
/*	$NetBSD: ch.c,v 1.26 1997/02/21 22:06:52 thorpej Exp $	*/

/*
 * Copyright (c) 1996, 1997 Jason R. Thorpe <thorpej@and.com>
 * All rights reserved.
 *
 * Partially based on an autochanger driver written by Stefan Grefen
 * and on an autochanger driver written by the Systems Programming Group
 * at the University of Utah Computer Science Department.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgements:
 *	This product includes software developed by Jason R. Thorpe
 *	for And Communications, http://www.and.com/
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/chio.h> 
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/conf.h>
#include <sys/fcntl.h>

#include <scsi/scsi_all.h>
#include <scsi/scsi_changer.h>
#include <scsi/scsiconf.h>

#define CHRETRIES	2
#define CHUNIT(x)	(minor((x)))

struct ch_softc {
	struct device	sc_dev;		/* generic device info */
	struct scsi_link *sc_link;	/* link in the SCSI bus */

	int		sc_picker;	/* current picker */

	/*
	 * The following information is obtained from the
	 * element address assignment page.
	 */
	int		sc_firsts[4];	/* firsts, indexed by CHET_* */
	int		sc_counts[4];	/* counts, indexed by CHET_* */

	/*
	 * The following mask defines the legal combinations
	 * of elements for the MOVE MEDIUM command.
	 */
	u_int8_t	sc_movemask[4];

	/*
	 * As above, but for EXCHANGE MEDIUM.
	 */
	u_int8_t	sc_exchangemask[4];

	int		flags;		/* misc. info */

	/*
	 * Quirks; see below.
	 */
	int             sc_settledelay; /* delay for settle */

};

/* sc_flags */
#define CHF_ROTATE	0x01		/* picker can rotate */

/* Autoconfiguration glue */
int	chmatch __P((struct device *, void *, void *));
void	chattach __P((struct device *, struct device *, void *));

struct cfattach ch_ca = {
	sizeof(struct ch_softc), chmatch, chattach
};

struct cfdriver ch_cd = {
	NULL, "ch", DV_DULL
};

struct scsi_inquiry_pattern ch_patterns[] = {
	{T_CHANGER, T_REMOV,
	 "",		"",		""},
};

/* SCSI glue */
struct scsi_device ch_switch = {
	NULL, NULL, NULL, NULL
};

int	ch_move __P((struct ch_softc *, struct changer_move *));
int	ch_exchange __P((struct ch_softc *, struct changer_exchange *));
int	ch_position __P((struct ch_softc *, struct changer_position *));
int	ch_usergetelemstatus __P((struct ch_softc *, int, u_int8_t *));
int	ch_getelemstatus __P((struct ch_softc *, int, int, caddr_t, size_t));
int	ch_get_params __P((struct ch_softc *, int));
void	ch_get_quirks __P((struct ch_softc *, struct scsi_inquiry_data *));

/*
 * SCSI changer quirks.
 */
struct chquirk {
	struct	scsi_inquiry_pattern cq_match; /* device id pattern */
	int	cq_settledelay;	/* settle delay, in seconds */
};

struct chquirk chquirks[] = {
	{{T_CHANGER, T_REMOV,
	  "SPECTRA",	"9000",		"0200"},
	 75},
};

int
chmatch(parent, match, aux)
	struct device *parent;
	void *match, *aux;
{
	struct scsibus_attach_args *sa = aux;
	int priority;

	(void)scsi_inqmatch(sa->sa_inqbuf,
	    (caddr_t)ch_patterns, sizeof(ch_patterns)/sizeof(ch_patterns[0]),
	    sizeof(ch_patterns[0]), &priority);

	return (priority);
}

void
chattach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct ch_softc *sc = (struct ch_softc *)self;
	struct scsibus_attach_args *sa = aux;
	struct scsi_link *link = sa->sa_sc_link;

	/* Glue into the SCSI bus */
	sc->sc_link = link;
	link->device = &ch_switch;
	link->device_softc = sc;
	link->openings = 1;

	printf("\n");

	/*
	 * Store our our device's quirks.
	 */
	ch_get_quirks(sc, sa->sa_inqbuf);

}

int
chopen(dev, flags, fmt, p)
	dev_t dev;
	int flags, fmt;
	struct proc *p;
{
	struct ch_softc *sc;
	int oldcounts[4];
	int i, unit, error = 0;

	unit = CHUNIT(dev);
	if ((unit >= ch_cd.cd_ndevs) ||
	    ((sc = ch_cd.cd_devs[unit]) == NULL))
		return (ENXIO);

	/*
	 * Only allow one open at a time.
	 */
	if (sc->sc_link->flags & SDEV_OPEN)
		return (EBUSY);

	sc->sc_link->flags |= SDEV_OPEN;

	/*
	 * Absorb any unit attention errors.  Ignore "not ready"
	 * since this might occur if e.g. a tape isn't actually
	 * loaded in the drive.
	 */
	error = scsi_test_unit_ready(sc->sc_link,
	    SCSI_IGNORE_NOT_READY|SCSI_IGNORE_MEDIA_CHANGE);
	if (error)
		goto bad;

	/*
	 * Get information about the device. Save old information
	 * so we can decide whether to be verbose about new parameters.
	 */
	for (i = 0; i < 4; i++) {
		oldcounts[i] = sc->sc_counts[i];
	}
	error = ch_get_params(sc, scsi_autoconf);
	if (error) {
		printf("%s: offline\n", sc->sc_dev.dv_xname);
		goto bad;
	}

	for (i = 0; i < 4; i++) {
		if (oldcounts[i] != sc->sc_counts[i]) {
			break;
		}
	}
	if (i < 4) {
#define PLURAL(c)	(c) == 1 ? "" : "s"
		printf("%s: %d slot%s, %d drive%s, %d picker%s, %d portal%s\n",
		    sc->sc_dev.dv_xname,
		    sc->sc_counts[CHET_ST], PLURAL(sc->sc_counts[CHET_ST]),
		    sc->sc_counts[CHET_DT], PLURAL(sc->sc_counts[CHET_DT]),
		    sc->sc_counts[CHET_MT], PLURAL(sc->sc_counts[CHET_MT]),
		    sc->sc_counts[CHET_IE], PLURAL(sc->sc_counts[CHET_IE]));
#undef PLURAL
#ifdef CHANGER_DEBUG
		printf("%s: move mask: 0x%x 0x%x 0x%x 0x%x\n",
		    sc->sc_dev.dv_xname,
		    sc->sc_movemask[CHET_MT], sc->sc_movemask[CHET_ST],
		    sc->sc_movemask[CHET_IE], sc->sc_movemask[CHET_DT]);
		printf("%s: exchange mask: 0x%x 0x%x 0x%x 0x%x\n",
		    sc->sc_dev.dv_xname,
		    sc->sc_exchangemask[CHET_MT], sc->sc_exchangemask[CHET_ST],
		    sc->sc_exchangemask[CHET_IE], sc->sc_exchangemask[CHET_DT]);
#endif /* CHANGER_DEBUG */
	}

	/* Default the current picker. */
	sc->sc_picker = sc->sc_firsts[CHET_MT];

	return (0);

 bad:
	sc->sc_link->flags &= ~SDEV_OPEN;
	return (error);
}

int
chclose(dev, flags, fmt, p)
	dev_t dev;
	int flags, fmt;
	struct proc *p;
{
	struct ch_softc *sc = ch_cd.cd_devs[CHUNIT(dev)];

	sc->sc_link->flags &= ~SDEV_OPEN;
	return (0);
}

int
chioctl(dev, cmd, data, flags, p)
	dev_t dev;
	u_long cmd;
	caddr_t data;
	int flags;
	struct proc *p;
{
	struct ch_softc *sc = ch_cd.cd_devs[CHUNIT(dev)];
	int error = 0;

	/*
	 * If this command can change the device's state, we must
	 * have the device open for writing.
	 */
	switch (cmd) {
	case CHIOGPICKER:
	case CHIOGPARAMS:
	case CHIOGSTATUS:
		break;

	default:
		if ((flags & FWRITE) == 0)
			return (EBADF);
	}

	switch (cmd) {
	case CHIOMOVE:
		error = ch_move(sc, (struct changer_move *)data);
		break;

	case CHIOEXCHANGE:
		error = ch_exchange(sc, (struct changer_exchange *)data);
		break;

	case CHIOPOSITION:
		error = ch_position(sc, (struct changer_position *)data);
		break;

	case CHIOGPICKER:
		*(int *)data = sc->sc_picker - sc->sc_firsts[CHET_MT];
		break;

	case CHIOSPICKER:	{
		int new_picker = *(int *)data;

		if (new_picker > (sc->sc_counts[CHET_MT] - 1))
			return (EINVAL);
		sc->sc_picker = sc->sc_firsts[CHET_MT] + new_picker;
		break;		}

	case CHIOGPARAMS:	{
		struct changer_params *cp = (struct changer_params *)data;

		cp->cp_curpicker = sc->sc_picker - sc->sc_firsts[CHET_MT];
		cp->cp_npickers = sc->sc_counts[CHET_MT];
		cp->cp_nslots = sc->sc_counts[CHET_ST];
		cp->cp_nportals = sc->sc_counts[CHET_IE];
		cp->cp_ndrives = sc->sc_counts[CHET_DT];
		break;		}

	case CHIOGSTATUS:	{
		struct changer_element_status *ces =
		    (struct changer_element_status *)data;

		error = ch_usergetelemstatus(sc, ces->ces_type, ces->ces_data);
		break;		}

	/* Implement prevent/allow? */

	default:
		error = scsi_do_safeioctl(sc->sc_link, dev, cmd, data,
		    flags, p);
		break;
	}

	return (error);
}

int
ch_move(sc, cm)
	struct ch_softc *sc;
	struct changer_move *cm;
{
	struct scsi_move_medium cmd;
	u_int16_t fromelem, toelem;

	/*
	 * Check arguments.
	 */
	if ((cm->cm_fromtype > CHET_DT) || (cm->cm_totype > CHET_DT))
		return (EINVAL);
	if ((cm->cm_fromunit > (sc->sc_counts[cm->cm_fromtype] - 1)) ||
	    (cm->cm_tounit > (sc->sc_counts[cm->cm_totype] - 1)))
		return (ENODEV);

	/*
	 * Check the request against the changer's capabilities.
	 */
	if ((sc->sc_movemask[cm->cm_fromtype] & (1 << cm->cm_totype)) == 0)
		return (EINVAL);

	/*
	 * Calculate the source and destination elements.
	 */
	fromelem = sc->sc_firsts[cm->cm_fromtype] + cm->cm_fromunit;
	toelem = sc->sc_firsts[cm->cm_totype] + cm->cm_tounit;

	/*
	 * Build the SCSI command.
	 */
	bzero(&cmd, sizeof(cmd));
	cmd.opcode = MOVE_MEDIUM;
	_lto2b(sc->sc_picker, cmd.tea);
	_lto2b(fromelem, cmd.src);
	_lto2b(toelem, cmd.dst);
	if (cm->cm_flags & CM_INVERT)
		cmd.flags |= MOVE_MEDIUM_INVERT;

	/*
	 * Send command to changer.
	 */
	return (scsi_scsi_cmd(sc->sc_link, (struct scsi_generic *)&cmd,
	    sizeof(cmd), NULL, 0, CHRETRIES, 100000, NULL, 0));
}

int
ch_exchange(sc, ce)
	struct ch_softc *sc;
	struct changer_exchange *ce;
{
	struct scsi_exchange_medium cmd;
	u_int16_t src, dst1, dst2;

	/*
	 * Check arguments.
	 */
	if ((ce->ce_srctype > CHET_DT) || (ce->ce_fdsttype > CHET_DT) ||
	    (ce->ce_sdsttype > CHET_DT))
		return (EINVAL);
	if ((ce->ce_srcunit > (sc->sc_counts[ce->ce_srctype] - 1)) ||
	    (ce->ce_fdstunit > (sc->sc_counts[ce->ce_fdsttype] - 1)) ||
	    (ce->ce_sdstunit > (sc->sc_counts[ce->ce_sdsttype] - 1)))
		return (ENODEV);

	/*
	 * Check the request against the changer's capabilities.
	 */
	if (((sc->sc_exchangemask[ce->ce_srctype] &
	     (1 << ce->ce_fdsttype)) == 0) ||
	    ((sc->sc_exchangemask[ce->ce_fdsttype] &
	     (1 << ce->ce_sdsttype)) == 0))
		return (EINVAL);

	/*
	 * Calculate the source and destination elements.
	 */
	src = sc->sc_firsts[ce->ce_srctype] + ce->ce_srcunit;
	dst1 = sc->sc_firsts[ce->ce_fdsttype] + ce->ce_fdstunit;
	dst2 = sc->sc_firsts[ce->ce_sdsttype] + ce->ce_sdstunit;

	/*
	 * Build the SCSI command.
	 */
	bzero(&cmd, sizeof(cmd));
	cmd.opcode = EXCHANGE_MEDIUM;
	_lto2b(sc->sc_picker, cmd.tea);
	_lto2b(src, cmd.src);
	_lto2b(dst1, cmd.fdst);
	_lto2b(dst2, cmd.sdst);
	if (ce->ce_flags & CE_INVERT1)
		cmd.flags |= EXCHANGE_MEDIUM_INV1;
	if (ce->ce_flags & CE_INVERT2)
		cmd.flags |= EXCHANGE_MEDIUM_INV2;

	/*
	 * Send command to changer.
	 */
	return (scsi_scsi_cmd(sc->sc_link, (struct scsi_generic *)&cmd,
	    sizeof(cmd), NULL, 0, CHRETRIES, 100000, NULL, 0));
}

int
ch_position(sc, cp)
	struct ch_softc *sc;
	struct changer_position *cp;
{
	struct scsi_position_to_element cmd;
	u_int16_t dst;

	/*
	 * Check arguments.
	 */
	if (cp->cp_type > CHET_DT)
		return (EINVAL);
	if (cp->cp_unit > (sc->sc_counts[cp->cp_type] - 1))
		return (ENODEV);

	/*
	 * Calculate the destination element.
	 */
	dst = sc->sc_firsts[cp->cp_type] + cp->cp_unit;

	/*
	 * Build the SCSI command.
	 */
	bzero(&cmd, sizeof(cmd));
	cmd.opcode = POSITION_TO_ELEMENT;
	_lto2b(sc->sc_picker, cmd.tea);
	_lto2b(dst, cmd.dst);
	if (cp->cp_flags & CP_INVERT)
		cmd.flags |= POSITION_TO_ELEMENT_INVERT;

	/*
	 * Send command to changer.
	 */
	return (scsi_scsi_cmd(sc->sc_link, (struct scsi_generic *)&cmd,
	    sizeof(cmd), NULL, 0, CHRETRIES, 100000, NULL, 0));
}

/*
 * Perform a READ ELEMENT STATUS on behalf of the user, and return to
 * the user only the data the user is interested in (i.e. an array of
 * flags bytes).
 */
int
ch_usergetelemstatus(sc, chet, uptr)
	struct ch_softc *sc;
	int chet;
	u_int8_t *uptr;
{
	struct read_element_status_header *st_hdr;
	struct read_element_status_page_header *pg_hdr;
	struct read_element_status_descriptor *desc;
	caddr_t data = NULL;
	size_t size, desclen;
	int avail, i, error = 0;
	u_int8_t *user_data = NULL;

	/*
	 * If there are no elements of the requested type in the changer,
	 * the request is invalid.
	 */
	if (sc->sc_counts[chet] == 0)
		return (EINVAL);

	/*
	 * Request one descriptor for the given element type.  This
	 * is used to determine the size of the descriptor so that
	 * we can allocate enough storage for all of them.  We assume
	 * that the first one can fit into 1k.
	 */
	data = (caddr_t)malloc(1024, M_DEVBUF, M_WAITOK);
	error = ch_getelemstatus(sc, sc->sc_firsts[chet], 1, data, 1024);
	if (error)
		goto done;

	st_hdr = (struct read_element_status_header *)data;
	pg_hdr = (struct read_element_status_page_header *)((u_long)st_hdr +
	    sizeof(struct read_element_status_header));
	desclen = _2btol(pg_hdr->edl);

	size = sizeof(struct read_element_status_header) +
	    sizeof(struct read_element_status_page_header) +
	    (desclen * sc->sc_counts[chet]);

	/*
	 * Reallocate storage for descriptors and get them from the
	 * device.
	 */
	free(data, M_DEVBUF);
	data = (caddr_t)malloc(size, M_DEVBUF, M_WAITOK);
	error = ch_getelemstatus(sc, sc->sc_firsts[chet],
	    sc->sc_counts[chet], data, size);
	if (error)
		goto done;

	/*
	 * Fill in the user status array.
	 */
	st_hdr = (struct read_element_status_header *)data;
	avail = _2btol(st_hdr->count);
	if (avail != sc->sc_counts[chet])
		printf("%s: warning, READ ELEMENT STATUS avail != count\n",
		    sc->sc_dev.dv_xname);

	user_data = (u_int8_t *)malloc(avail, M_DEVBUF, M_WAITOK);

	desc = (struct read_element_status_descriptor *)((u_long)data +
	    sizeof(struct read_element_status_header) +
	    sizeof(struct read_element_status_page_header));
	for (i = 0; i < avail; ++i) {
		user_data[i] = desc->flags1;
		(u_long)desc += desclen;
	}

	/* Copy flags array out to userspace. */
	error = copyout(user_data, uptr, avail);

 done:
	if (data != NULL)
		free(data, M_DEVBUF);
	if (user_data != NULL)
		free(user_data, M_DEVBUF);
	return (error);
}

int
ch_getelemstatus(sc, first, count, data, datalen)
	struct ch_softc *sc;
	int first, count;
	caddr_t data;
	size_t datalen;
{
	struct scsi_read_element_status cmd;

	/*
	 * Build SCSI command.
	 */
	bzero(&cmd, sizeof(cmd));
	cmd.opcode = READ_ELEMENT_STATUS;
	_lto2b(first, cmd.sea);
	_lto2b(count, cmd.count);
	_lto3b(datalen, cmd.len);

	/*
	 * Send command to changer.
	 */
	return (scsi_scsi_cmd(sc->sc_link, (struct scsi_generic *)&cmd,
	    sizeof(cmd), (u_char *)data, datalen, CHRETRIES, 100000, NULL, SCSI_DATA_IN));
}


/*
 * Ask the device about itself and fill in the parameters in our
 * softc.
 */
int
ch_get_params(sc, scsiflags)
	struct ch_softc *sc;
	int scsiflags;
{
	struct scsi_mode_sense cmd;
	struct scsi_mode_sense_data {
		struct scsi_mode_header header;
		union {
			struct page_element_address_assignment ea;
			struct page_transport_geometry_parameters tg;
			struct page_device_capabilities cap;
		} pages;
	} sense_data;
	int error, from;
	u_int8_t *moves, *exchanges;

	/*
	 * Grab info from the element address assignment page.
	 */
	bzero(&cmd, sizeof(cmd));
	bzero(&sense_data, sizeof(sense_data));
	cmd.opcode = MODE_SENSE;
	cmd.byte2 |= 0x08;	/* disable block descriptors */
	cmd.page = 0x1d;
	cmd.length = (sizeof(sense_data) & 0xff);
	error = scsi_scsi_cmd(sc->sc_link, (struct scsi_generic *)&cmd,
	    sizeof(cmd), (u_char *)&sense_data, sizeof(sense_data), CHRETRIES,
	    6000, NULL, scsiflags | SCSI_DATA_IN);
	if (error) {
		printf("%s: could not sense element address page\n",
		    sc->sc_dev.dv_xname);
		return (error);
	}

	sc->sc_firsts[CHET_MT] = _2btol(sense_data.pages.ea.mtea);
	sc->sc_counts[CHET_MT] = _2btol(sense_data.pages.ea.nmte);
	sc->sc_firsts[CHET_ST] = _2btol(sense_data.pages.ea.fsea);
	sc->sc_counts[CHET_ST] = _2btol(sense_data.pages.ea.nse);
	sc->sc_firsts[CHET_IE] = _2btol(sense_data.pages.ea.fieea);
	sc->sc_counts[CHET_IE] = _2btol(sense_data.pages.ea.niee);
	sc->sc_firsts[CHET_DT] = _2btol(sense_data.pages.ea.fdtea);
	sc->sc_counts[CHET_DT] = _2btol(sense_data.pages.ea.ndte);

	/* XXX ask for page trasport geom */

	/*
	 * Grab info from the capabilities page.
	 */
	bzero(&cmd, sizeof(cmd));
	bzero(&sense_data, sizeof(sense_data));
	cmd.opcode = MODE_SENSE;
	cmd.byte2 |= 0x08;	/* disable block descriptors */
	cmd.page = 0x1f;
	cmd.length = (sizeof(sense_data) & 0xff);
	error = scsi_scsi_cmd(sc->sc_link, (struct scsi_generic *)&cmd,
	    sizeof(cmd), (u_char *)&sense_data, sizeof(sense_data), CHRETRIES,
	    6000, NULL, scsiflags | SCSI_DATA_IN);
	if (error) {
		printf("%s: could not sense capabilities page\n",
		    sc->sc_dev.dv_xname);
		return (error);
	}

	bzero(sc->sc_movemask, sizeof(sc->sc_movemask));
	bzero(sc->sc_exchangemask, sizeof(sc->sc_exchangemask));
	moves = &sense_data.pages.cap.move_from_mt;
	exchanges = &sense_data.pages.cap.exchange_with_mt;
	for (from = CHET_MT; from <= CHET_DT; ++from) {
		sc->sc_movemask[from] = moves[from];
		sc->sc_exchangemask[from] = exchanges[from];
	}

	sc->sc_link->flags |= SDEV_MEDIA_LOADED;
	return (0);
}

void
ch_get_quirks(sc, inqbuf)
	struct ch_softc *sc;
	struct scsi_inquiry_data *inqbuf;
{
	struct chquirk *match;
	int priority;

	sc->sc_settledelay = 0;

	match = (struct chquirk *)scsi_inqmatch(inqbuf,
	    (caddr_t)chquirks,
	    sizeof(chquirks) / sizeof(chquirks[0]),
	    sizeof(chquirks[0]), &priority);
	if (priority != 0) {
		sc->sc_settledelay = match->cq_settledelay;
	}
}