diff mbox series

[v3,8/8] scsi: target: tcmu: Make TMR notification optional

Message ID 20200726153510.13077-9-bstroesser@ts.fujitsu.com (mailing list archive)
State Accepted
Commit 59526d7a187f4340bfc9b91f8a9ecb7cb39f982c
Headers show
Series scsi: target: tcmu: Add TMR notification for tcmu | expand

Commit Message

Bodo Stroesser July 26, 2020, 3:35 p.m. UTC 
Add "tmr_notification" configFS attribute to tcmu devices.
If default value 0 of the attribute is used, tcmu only
removes aborted commands from qfull_queue.
If user changes tmr_notification to 1, additionally
TMR notifications will be written to the cmd ring.

Signed-off-by: Bodo Stroesser <bstroesser@ts.fujitsu.com>
---
 drivers/target/target_core_user.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
diff mbox series

Patch

diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index cb5a561a46e8..9b7592350502 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -118,6 +118,7 @@  struct tcmu_dev {
 #define TCMU_DEV_BIT_OPEN 0
 #define TCMU_DEV_BIT_BROKEN 1
 #define TCMU_DEV_BIT_BLOCKED 2
+#define TCMU_DEV_BIT_TMR_NOTIFY 3
 	unsigned long flags;
 
 	struct uio_info uio_info;
@@ -1260,6 +1261,9 @@  tcmu_tmr_notify(struct se_device *se_dev, enum tcm_tmreq_table tmf,
 	if (unqueued)
 		tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer);
 
+	if (!test_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags))
+		goto unlock;
+
 	pr_debug("TMR event %d on dev %s, aborted cmds %d, afflicted cmd_ids %d\n",
 		 tcmu_tmr_type(tmf), udev->name, i, cmd_cnt);
 
@@ -2706,6 +2710,39 @@  static ssize_t tcmu_emulate_write_cache_store(struct config_item *item,
 }
 CONFIGFS_ATTR(tcmu_, emulate_write_cache);
 
+static ssize_t tcmu_tmr_notification_show(struct config_item *item, char *page)
+{
+	struct se_dev_attrib *da = container_of(to_config_group(item),
+					struct se_dev_attrib, da_group);
+	struct tcmu_dev *udev = TCMU_DEV(da->da_dev);
+
+	return snprintf(page, PAGE_SIZE, "%i\n",
+			test_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags));
+}
+
+static ssize_t tcmu_tmr_notification_store(struct config_item *item,
+					   const char *page, size_t count)
+{
+	struct se_dev_attrib *da = container_of(to_config_group(item),
+					struct se_dev_attrib, da_group);
+	struct tcmu_dev *udev = TCMU_DEV(da->da_dev);
+	u8 val;
+	int ret;
+
+	ret = kstrtou8(page, 0, &val);
+	if (ret < 0)
+		return ret;
+	if (val > 1)
+		return -EINVAL;
+
+	if (val)
+		set_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags);
+	else
+		clear_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags);
+	return count;
+}
+CONFIGFS_ATTR(tcmu_, tmr_notification);
+
 static ssize_t tcmu_block_dev_show(struct config_item *item, char *page)
 {
 	struct se_device *se_dev = container_of(to_config_group(item),
@@ -2787,6 +2824,7 @@  static struct configfs_attribute *tcmu_attrib_attrs[] = {
 	&tcmu_attr_dev_config,
 	&tcmu_attr_dev_size,
 	&tcmu_attr_emulate_write_cache,
+	&tcmu_attr_tmr_notification,
 	&tcmu_attr_nl_reply_supported,
 	NULL,
 };