target: export protocol identifier

I think the transport statistics device file was supposed
to show scsiTransportProtocolType. It instead shows the
fabric name which is normally closer to the driver name.

I was thinking I cannot change from fabric name to protocol
type name incase people are expecting the driver name, so
this patch adds another file proto_id that exports the SCSI
protocol identifier ID.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/target/target_core_stat.c b/drivers/target/target_core_stat.c
index 1a39033d2bff..be380e4acfcd 100644
--- a/drivers/target/target_core_stat.c
+++ b/drivers/target/target_core_stat.c
@@ -795,16 +795,34 @@ static ssize_t target_stat_transport_dev_name_show(struct config_item *item,
         return ret;
 }
 
+static ssize_t target_stat_transport_proto_id_show(struct config_item *item,
+                char *page)
+{
+        struct se_lun *lun = to_transport_stat(item);
+        struct se_device *dev;
+        struct se_portal_group *tpg = lun->lun_tpg;
+        ssize_t ret = -ENODEV;
+
+        rcu_read_lock();
+        dev = rcu_dereference(lun->lun_se_dev);
+        if (dev)
+                ret = snprintf(page, PAGE_SIZE, "%u\n", tpg->proto_id);
+        rcu_read_unlock();
+        return ret;
+}
+
 CONFIGFS_ATTR_RO(target_stat_transport_, inst);
 CONFIGFS_ATTR_RO(target_stat_transport_, device);
 CONFIGFS_ATTR_RO(target_stat_transport_, indx);
 CONFIGFS_ATTR_RO(target_stat_transport_, dev_name);
+CONFIGFS_ATTR_RO(target_stat_transport_, proto_id);
 
 static struct configfs_attribute *target_stat_scsi_transport_attrs[] = {
         &target_stat_transport_attr_inst,
         &target_stat_transport_attr_device,
         &target_stat_transport_attr_indx,
         &target_stat_transport_attr_dev_name,
+        &target_stat_transport_attr_proto_id,
         NULL,
 };