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path: root/drivers/s390/scsi/zfcp_scsi.c
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Diffstat (limited to 'drivers/s390/scsi/zfcp_scsi.c')
-rw-r--r--drivers/s390/scsi/zfcp_scsi.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c
index e8fbeaeb5fbf..7d0da230eb63 100644
--- a/drivers/s390/scsi/zfcp_scsi.c
+++ b/drivers/s390/scsi/zfcp_scsi.c
@@ -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,