diff --git a/include/net/dsa.h b/include/net/dsa.h
index 6700dff46a80..8198efcc8ced 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -296,20 +296,23 @@ static inline u32 dsa_user_ports(struct dsa_switch *ds)
 	return mask;
 }
 
+/* Return the local port used to reach an arbitrary switch port */
+static inline unsigned int dsa_towards_port(struct dsa_switch *ds, int device,
+					    int port)
+{
+	if (device == ds->index)
+		return port;
+	else
+		return ds->rtable[device];
+}
+
+/* Return the local port used to reach the dedicated CPU port */
 static inline u8 dsa_upstream_port(struct dsa_switch *ds)
 {
 	struct dsa_switch_tree *dst = ds->dst;
+	struct dsa_port *cpu_dp = dst->cpu_dp;
 
-	/*
-	 * If this is the root switch (i.e. the switch that connects
-	 * to the CPU), return the cpu port number on this switch.
-	 * Else return the (DSA) port number that connects to the
-	 * switch that is one hop closer to the cpu.
-	 */
-	if (dst->cpu_dp->ds == ds)
-		return dst->cpu_dp->index;
-	else
-		return ds->rtable[dst->cpu_dp->ds->index];
+	return dsa_towards_port(ds, cpu_dp->ds->index, cpu_dp->index);
 }
 
 typedef int dsa_fdb_dump_cb_t(const unsigned char *addr, u16 vid,
diff --git a/net/dsa/switch.c b/net/dsa/switch.c
index 9a01514ea9f3..b93511726069 100644
--- a/net/dsa/switch.c
+++ b/net/dsa/switch.c
@@ -83,29 +83,23 @@ static int dsa_switch_bridge_leave(struct dsa_switch *ds,
 static int dsa_switch_fdb_add(struct dsa_switch *ds,
 			      struct dsa_notifier_fdb_info *info)
 {
-	/* Do not care yet about other switch chips of the fabric */
-	if (ds->index != info->sw_index)
-		return 0;
+	int port = dsa_towards_port(ds, info->sw_index, info->port);
 
 	if (!ds->ops->port_fdb_add)
 		return -EOPNOTSUPP;
 
-	return ds->ops->port_fdb_add(ds, info->port, info->addr,
-				     info->vid);
+	return ds->ops->port_fdb_add(ds, port, info->addr, info->vid);
 }
 
 static int dsa_switch_fdb_del(struct dsa_switch *ds,
 			      struct dsa_notifier_fdb_info *info)
 {
-	/* Do not care yet about other switch chips of the fabric */
-	if (ds->index != info->sw_index)
-		return 0;
+	int port = dsa_towards_port(ds, info->sw_index, info->port);
 
 	if (!ds->ops->port_fdb_del)
 		return -EOPNOTSUPP;
 
-	return ds->ops->port_fdb_del(ds, info->port, info->addr,
-				     info->vid);
+	return ds->ops->port_fdb_del(ds, port, info->addr, info->vid);
 }
 
 static int