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| author | Vikas Chaudhary <vikas.chaudhary@qlogic.com> | 2011-03-21 11:34:31 +0100 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2011-03-23 18:53:02 +0100 |
| commit | 8bb4033d2b91e055a32e905e10a7034a4b077b7a (patch) | |
| tree | 4c7f2135700972370c886c430c2e9b87c5fee026 | |
| parent | [SCSI] qla4xxx: cleanup function qla4xxx_process_ddb_changed (diff) | |
| download | linux-8bb4033d2b91e055a32e905e10a7034a4b077b7a.tar.xz linux-8bb4033d2b91e055a32e905e10a7034a4b077b7a.zip | |
[SCSI] qla4xxx: Add support for ql4xmaxqdepth command line parameter
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>
| -rw-r--r-- | drivers/scsi/qla4xxx/ql4_os.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c index f80b702730ad..df46e5d8f74e 100644 --- a/drivers/scsi/qla4xxx/ql4_os.c +++ b/drivers/scsi/qla4xxx/ql4_os.c @@ -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; } |