[PATCH v2 8/8] scsi: target: Export fabric driver direct submit settings

[Mike Christie <michael.christie@oracle.com>]

This exports the fabric driver's direct submit settings, so users know
what the driver supports. It will be helpful when they are exporting
a device through different targets and one doesn't support direct
submission.

The new files allow the fabric to report what submission types they
default to and if they support direct submission:

default_submit_type:
1 - TARGET_DIRECT_SUBMIT - If the user has not requested a specific
value then the fabric requests direction submission.
2 - TARGET_QUEUE_SUBMIT - If the user has not requested a specific
value then the fabric requests queued submission.

Note that these fabric values are based on what the fabric driver
currently defaults to for compat with exiting setups.

direct_submit_supported:
0 - The fabric does not support direct submission.
1 - The fabric supports direct submission.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
 drivers/target/target_core_fabric_configfs.c | 24 ++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/target/target_core_fabric_configfs.c b/drivers/target/target_core_fabric_configfs.c
index b7c637644cd4..7156a4dc1ca7 100644
--- a/drivers/target/target_core_fabric_configfs.c
+++ b/drivers/target/target_core_fabric_configfs.c
@@ -1065,8 +1065,32 @@ target_fabric_wwn_cmd_completion_affinity_store(struct config_item *item,
 }
 CONFIGFS_ATTR(target_fabric_wwn_, cmd_completion_affinity);
 
+static ssize_t
+target_fabric_wwn_default_submit_type_show(struct config_item *item,
+					   char *page)
+{
+	struct se_wwn *wwn = container_of(to_config_group(item), struct se_wwn,
+					  param_group);
+	return sysfs_emit(page, "%u\n",
+			  wwn->wwn_tf->tf_ops->default_submit_type);
+}
+CONFIGFS_ATTR_RO(target_fabric_wwn_, default_submit_type);
+
+static ssize_t
+target_fabric_wwn_direct_submit_supported_show(struct config_item *item,
+					       char *page)
+{
+	struct se_wwn *wwn = container_of(to_config_group(item), struct se_wwn,
+					  param_group);
+	return sysfs_emit(page, "%u\n",
+			  wwn->wwn_tf->tf_ops->direct_submit_supp);
+}
+CONFIGFS_ATTR_RO(target_fabric_wwn_, direct_submit_supported);
+
 static struct configfs_attribute *target_fabric_wwn_param_attrs[] = {
 	&target_fabric_wwn_attr_cmd_completion_affinity,
+	&target_fabric_wwn_attr_default_submit_type,
+	&target_fabric_wwn_attr_direct_submit_supported,
 	NULL,
 };
 
-- 
2.34.1