diff options
| author | Christof Schmitt <christof.schmitt@de.ibm.com> | 2009-05-15 13:18:16 +0200 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2009-05-23 15:44:14 -0500 |
| commit | a40a1bafe7da0afe61b1c20fc50e18c07ce724f9 (patch) | |
| tree | 458e45f4568a55fbf2a00015e6b4474f055beaec /drivers | |
| parent | 955a21555dc8dc4a81da7063d595cd7558f413ce (diff) | |
[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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/s390/scsi/zfcp_scsi.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c index e8fbeaeb5fb..7d0da230eb6 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, |