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-rw-r--r--drivers/scsi/qla4xxx/ql4_os.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index 45144aa04433..f4ea58ee8673 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -68,6 +68,14 @@ MODULE_PARM_DESC(ql4xmaxqdepth,
" Maximum queue depth to report for target devices.\n"
"\t\t Default: 32.");
+static int ql4xqfulltracking = 1;
+module_param(ql4xqfulltracking, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(ql4xqfulltracking,
+ " Enable or disable dynamic tracking and adjustment of\n"
+ "\t\t scsi device queue depth.\n"
+ "\t\t 0 - Disable.\n"
+ "\t\t 1 - Enable. (Default)");
+
static int ql4xsess_recovery_tmo = QL4_SESS_RECOVERY_TMO;
module_param(ql4xsess_recovery_tmo, int, S_IRUGO);
MODULE_PARM_DESC(ql4xsess_recovery_tmo,
@@ -140,6 +148,8 @@ static int qla4xxx_slave_configure(struct scsi_device *device);
static void qla4xxx_slave_destroy(struct scsi_device *sdev);
static umode_t ql4_attr_is_visible(int param_type, int param);
static int qla4xxx_host_reset(struct Scsi_Host *shost, int reset_type);
+static int qla4xxx_change_queue_depth(struct scsi_device *sdev, int qdepth,
+ int reason);
static struct qla4_8xxx_legacy_intr_set legacy_intr[] =
QLA82XX_LEGACY_INTR_CONFIG;
@@ -159,6 +169,7 @@ static struct scsi_host_template qla4xxx_driver_template = {
.slave_configure = qla4xxx_slave_configure,
.slave_alloc = qla4xxx_slave_alloc,
.slave_destroy = qla4xxx_slave_destroy,
+ .change_queue_depth = qla4xxx_change_queue_depth,
.this_id = -1,
.cmd_per_lun = 3,
@@ -5251,6 +5262,15 @@ static void qla4xxx_slave_destroy(struct scsi_device *sdev)
scsi_deactivate_tcq(sdev, 1);
}
+static int qla4xxx_change_queue_depth(struct scsi_device *sdev, int qdepth,
+ int reason)
+{
+ if (!ql4xqfulltracking)
+ return -EOPNOTSUPP;
+
+ return iscsi_change_queue_depth(sdev, qdepth, reason);
+}
+
/**
* qla4xxx_del_from_active_array - returns an active srb
* @ha: Pointer to host adapter structure.