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authorTej Parkash <tej.parkash@qlogic.com>2012-04-30 04:12:19 -0700
committerJames Bottomley <JBottomley@Parallels.com>2012-05-30 12:59:26 +0400
commitf7b4aa63650484e6ab11e8e00a6625fa57a67bd1 (patch)
tree0aaebf6b365ee6545b4a029a709948d34cf10bde /drivers
parent90599b62ca80a0d2f88aa88bc05bf8795731fab8 (diff)
downloadlinux-f7b4aa63650484e6ab11e8e00a6625fa57a67bd1.tar.gz
[SCSI] qla4xxx: Add change_queue_depth API support
change_queue_depth will adjust device queuedepth upon receiving "SAM_STAT_TASK_SET_FULL" scsi status from the target. Also added ql4xqfulltracking command line param to enable or disable queuefull tracking. One can disabling queuefull tracking to ensure user set scsi device queuedepth is not altered. Signed-off-by: Tej Parkash <tej.parkash@qlogic.com> Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers')
-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 45144aa0443..f4ea58ee867 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.