[PATCH 08/13] qla4xxx: Add support for ql4xmaxqdepth command line parameter
From: <hidden>
Date: 2011-03-21 11:01:15
Subsystem:
qlogic qla4xxx iscsi driver, scsi subsystem, the rest · Maintainers:
Nilesh Javali, Manish Rangankar, "James E.J. Bottomley", "Martin K. Petersen", Linus Torvalds
From: Vikas Chaudhary <redacted> 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 <redacted> --- 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 277c45f..051c049 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; }
--
1.7.3.2