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[SCSI] ibmvscsi: Changeable queue depth

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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>
This commit is contained in:
Brian King 2007-05-29 15:46:14 -05:00 committed by James Bottomley
parent d5587d5dcd
commit 742d25b819
2 changed files with 19 additions and 0 deletions
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18
drivers/scsi/ibmvscsi/ibmvscsi.c
View File

@ -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,

1
drivers/scsi/ibmvscsi/ibmvscsi.h
View File

@ -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