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| author |   Brian King <brking@linux.vnet.ibm.com> | 2007-05-29 15:46:14 -0500 |
|---|---|---|
| committer |   James Bottomley <jejb@mulgrave.il.steeleye.com> | 2007-05-29 22:52:31 -0500 |
| commit | 742d25b819f11dce91b89e6c9ac17402a119f20a (patch) | |
| tree | 542323687fa594b0fecf2136585998668124a957 /drivers/scsi/ibmvscsi | |
| parent | [SCSI] stex: convert to use the data buffer accessors (diff) | |
| download | linux-dev-742d25b819f11dce91b89e6c9ac17402a119f20a.tar.xz linux-dev-742d25b819f11dce91b89e6c9ac17402a119f20a.zip | |
[SCSI] ibmvscsi: Changeable queue depth
Adds support for a changeable queue depth to ibmvscsi.
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi/ibmvscsi')
| -rw-r--r-- | drivers/scsi/ibmvscsi/ibmvscsi.c | 18 | ||||
| -rw-r--r-- | drivers/scsi/ibmvscsi/ibmvscsi.h | 1 |
2 files changed, 19 insertions, 0 deletions
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c index b10eefe735c5..b580af95956b 100644 --- a/drivers/scsi/ibmvscsi/ibmvscsi.c +++ b/drivers/scsi/ibmvscsi/ibmvscsi.c @@ -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, diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.h b/drivers/scsi/ibmvscsi/ibmvscsi.h index 77cc1d40f5bb..727ca7c95926 100644 --- a/drivers/scsi/ibmvscsi/ibmvscsi.h +++ b/drivers/scsi/ibmvscsi/ibmvscsi.h @@ -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 |