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[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: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Christof Schmitt 2009-05-15 13:18:16 +02:00 committed by James Bottomley
parent 955a21555d
commit a40a1bafe7
1 changed files with 12 additions and 1 deletions
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13
drivers/s390/scsi/zfcp_scsi.c
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@ -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,