[SCSI] scsi_transport_iscsi: Added support to update mtu

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h
index 629ca42..d1f0927 100644
--- a/include/scsi/iscsi_if.h
+++ b/include/scsi/iscsi_if.h
@@ -313,6 +313,7 @@
 	ISCSI_NET_PARAM_VLAN_ENABLED		= 15,
 	ISCSI_NET_PARAM_IFACE_TYPE		= 16,
 	ISCSI_NET_PARAM_IFACE_NAME		= 17,
+	ISCSI_NET_PARAM_MTU			= 18,
 };
 
 enum iscsi_conn_state {