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Commit a40a1baf authored by Christof Schmitt's avatar Christof Schmitt Committed by James Bottomley
Browse files

[SCSI] zfcp: Make queue_depth adjustable 



zfcp did always set the queue_depth for SCSI devices to 32, not
allowing to change this. Introduce a kernel parameter zfcp.queue_depth
and the change_queue_depth callback to allow changing the queue_depth
when it is required.

Reviewed-by: default avatarSwen Schillig <swen@vnet.ibm.com>
Signed-off-by: default avatarChristof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
parent 955a2155

drivers/s390/scsi/zfcp_scsi.c

+12 −1
Original line number Diff line number Diff line
@@ -12,6 +12,10 @@ 
#include "zfcp_ext.h"

#include <asm/atomic.h>



static unsigned int default_depth = 32;

module_param_named(queue_depth, default_depth, uint, 0600);

MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");



/* Find start of Sense Information in FCP response unit*/

char *zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)

{
@@ -24,6 +28,12 @@ char *zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) 
	return fcp_sns_info_ptr;

}



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

{

	scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);

	return sdev->queue_depth;

}



static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)

{

	struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
@@ -34,7 +44,7 @@ static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt) 
static int zfcp_scsi_slave_configure(struct scsi_device *sdp)

{

	if (sdp->tagged_supported)

		scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, 32);

		scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);

	else

		scsi_adjust_queue_depth(sdp, 0, 1);

	return 0;
@@ -647,6 +657,7 @@ struct zfcp_data zfcp_data = { 
		.name			 = "zfcp",

		.module			 = THIS_MODULE,

		.proc_name		 = "zfcp",

		.change_queue_depth	 = zfcp_scsi_change_queue_depth,

		.slave_alloc		 = zfcp_scsi_slave_alloc,

		.slave_configure	 = zfcp_scsi_slave_configure,

		.slave_destroy		 = zfcp_scsi_slave_destroy,