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Commit 742d25b8 authored by Brian King's avatar Brian King Committed by James Bottomley
Browse files

[SCSI] ibmvscsi: Changeable queue depth 



Adds support for a changeable queue depth to ibmvscsi.

Signed-off-by: default avatarBrian King <brking@linux.vnet.ibm.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent d5587d5d

drivers/scsi/ibmvscsi/ibmvscsi.c

+18 −0
Original line number Diff line number Diff line
@@ -1375,6 +1375,23 @@ static int ibmvscsi_slave_configure(struct scsi_device *sdev) 
	return 0;

}



/**

 * ibmvscsi_change_queue_depth - Change the device's queue depth

 * @sdev:	scsi device struct

 * @qdepth:	depth to set

 *

 * Return value:

 * 	actual depth set

 **/

static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)

{

	if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)

		qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;



	scsi_adjust_queue_depth(sdev, 0, qdepth);

	return sdev->queue_depth;

}



/* ------------------------------------------------------------

 * sysfs attributes

 */
@@ -1521,6 +1538,7 @@ static struct scsi_host_template driver_template = { 
	.eh_abort_handler = ibmvscsi_eh_abort_handler,

	.eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,

	.slave_configure = ibmvscsi_slave_configure,

	.change_queue_depth = ibmvscsi_change_queue_depth,

	.cmd_per_lun = 16,

	.can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,

	.this_id = -1,

drivers/scsi/ibmvscsi/ibmvscsi.h

+1 −0
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ struct Scsi_Host; 
#define MAX_INDIRECT_BUFS 10



#define IBMVSCSI_MAX_REQUESTS_DEFAULT 100

#define IBMVSCSI_MAX_CMDS_PER_LUN 64



/* ------------------------------------------------------------

 * Data Structures