diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index f8c5492..33e9946 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -217,6 +217,13 @@
 	return !!(ds->tag_protocol == htons(ETH_P_DSA));
 }
 
+bool dsa_uses_trailer_tags(void *dsa_ptr)
+{
+	struct dsa_switch *ds = dsa_ptr;
+
+	return !!(ds->tag_protocol == htons(ETH_P_TRAILER));
+}
+
 
 /* link polling *************************************************************/
 static void dsa_link_poll_work(struct work_struct *ugly)