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Commit 5c9cfedd authored by Salyzyn, Mark's avatar Salyzyn, Mark Committed by James Bottomley
Browse files

[SCSI] aacraid: Changeable queue depth 



Inspired by Brian King's patch to the ibmvscsi driver. Adds support for
a changeable queue depth to the aacraid driver.

Signed-off-by: default avatarMark Salyzyn <aacraid@adaptec.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent 32fbac22

drivers/scsi/aacraid/linit.c

+38 −0
Original line number Diff line number Diff line
@@ -446,6 +446,43 @@ static int aac_slave_configure(struct scsi_device *sdev) 
	return 0;

}



/**

 *	aac_change_queue_depth		-	alter queue depths

 *	@sdev:	SCSI device we are considering

 *	@depth:	desired queue depth

 *

 *	Alters queue depths for target device based on the host adapter's

 *	total capacity and the queue depth supported by the target device.

 */



static int aac_change_queue_depth(struct scsi_device *sdev, int depth)

{

	if (sdev->tagged_supported && (sdev->type == TYPE_DISK) &&

	    (sdev_channel(sdev) == CONTAINER_CHANNEL)) {

		struct scsi_device * dev;

		struct Scsi_Host *host = sdev->host;

		unsigned num = 0;



		__shost_for_each_device(dev, host) {

			if (dev->tagged_supported && (dev->type == TYPE_DISK) &&

			    (sdev_channel(dev) == CONTAINER_CHANNEL))

				++num;

			++num;

		}

		if (num >= host->can_queue)

			num = host->can_queue - 1;

		if (depth > (host->can_queue - num))

			depth = host->can_queue - num;

		if (depth > 256)

			depth = 256;

		else if (depth < 2)

			depth = 2;

		scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, depth);

	} else

		scsi_adjust_queue_depth(sdev, 0, 1);

	return sdev->queue_depth;

}



static int aac_ioctl(struct scsi_device *sdev, int cmd, void __user * arg)

{

	struct aac_dev *dev = (struct aac_dev *)sdev->host->hostdata;
@@ -844,6 +881,7 @@ static struct scsi_host_template aac_driver_template = { 
	.bios_param     		= aac_biosparm,	

	.shost_attrs			= aac_attrs,

	.slave_configure		= aac_slave_configure,

	.change_queue_depth		= aac_change_queue_depth,

	.eh_abort_handler		= aac_eh_abort,

	.eh_host_reset_handler		= aac_eh_reset,

	.can_queue      		= AAC_NUM_IO_FIB,