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[SCSI] qla4xxx: Add support for ql4xmaxqdepth command line parameter

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This provides the flexibility to modify the qdepth based on different
target devices to make the best use of system resources.

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Vikas Chaudhary 2011-03-21 03:34:31 -07:00 committed by James Bottomley
parent fc7657c9d9
commit 8bb4033d2b
1 changed files with 11 additions and 1 deletions
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12
drivers/scsi/qla4xxx/ql4_os.c
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@ -51,6 +51,11 @@ MODULE_PARM_DESC(ql4xenablemsix,
" 2 = enable MSI interrupt mechanism.");
#define QL4_DEF_QDEPTH 32
static int ql4xmaxqdepth = QL4_DEF_QDEPTH;
module_param(ql4xmaxqdepth, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(ql4xmaxqdepth,
"Maximum queue depth to report for target devices.\n"
" Default: 32.");
/*
* SCSI host template entry points
@ -1904,10 +1909,15 @@ static int qla4xxx_slave_alloc(struct scsi_device *sdev)
{
struct iscsi_cls_session *sess = starget_to_session(sdev->sdev_target);
struct ddb_entry *ddb = sess->dd_data;
int queue_depth = QL4_DEF_QDEPTH;
sdev->hostdata = ddb;
sdev->tagged_supported = 1;
scsi_activate_tcq(sdev, QL4_DEF_QDEPTH);
if (ql4xmaxqdepth != 0 && ql4xmaxqdepth <= 0xffffU)
queue_depth = ql4xmaxqdepth;
scsi_activate_tcq(sdev, queue_depth);
return 0;
}