diff --git a/include/net/dsa.h b/include/net/dsa.h
index a4f66dbb4b7c06f3bae090802ca408ac197be479..7f46b521313e51fdd032bd957f386d704c30e2c8 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -101,6 +101,15 @@ struct dsa_platform_data {
 
 struct packet_type;
 
+struct dsa_device_ops {
+	struct sk_buff *(*xmit)(struct sk_buff *skb, struct net_device *dev);
+	struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev,
+			       struct packet_type *pt,
+			       struct net_device *orig_dev);
+	int (*flow_dissect)(const struct sk_buff *skb, __be16 *proto,
+			    int *offset);
+};
+
 struct dsa_switch_tree {
 	struct list_head	list;
 
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 0cc672aba1f00e58ecdaa83d6fdc1d53ef9eec19..5b5be9577257308cb143b2c98eaf3d47881bbf3f 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -4,6 +4,7 @@
 #include <linux/ip.h>
 #include <linux/ipv6.h>
 #include <linux/if_vlan.h>
+#include <net/dsa.h>
 #include <net/ip.h>
 #include <net/ipv6.h>
 #include <net/gre.h>
@@ -440,6 +441,17 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
 			 skb->vlan_proto : skb->protocol;
 		nhoff = skb_network_offset(skb);
 		hlen = skb_headlen(skb);
+		if (unlikely(netdev_uses_dsa(skb->dev))) {
+			const struct dsa_device_ops *ops;
+			int offset;
+
+			ops = skb->dev->dsa_ptr->tag_ops;
+			if (ops->flow_dissect &&
+			    !ops->flow_dissect(skb, &proto, &offset)) {
+				hlen -= offset;
+				nhoff += offset;
+			}
+		}
 	}
 
 	/* It is ensured by skb_flow_dissector_init() that control key will
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index 1debf9c42fc4219c29bd8738b797d2168276a3c8..9c3eeb72462d88cfa77704884ad083c8e462bf5b 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -65,13 +65,6 @@ struct dsa_notifier_vlan_info {
 	int port;
 };
 
-struct dsa_device_ops {
-	struct sk_buff *(*xmit)(struct sk_buff *skb, struct net_device *dev);
-	struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev,
-			       struct packet_type *pt,
-			       struct net_device *orig_dev);
-};
-
 struct dsa_slave_priv {
 	/* Copy of dp->ds->dst->tag_ops->xmit for faster access in hot path */
 	struct sk_buff *	(*xmit)(struct sk_buff *skb,
diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c
index 2f32b7ea3365ce87f61e6a5002fbe45a4228e85f..02163c045a96ac639891931583585881eac08b2e 100644
--- a/net/dsa/tag_mtk.c
+++ b/net/dsa/tag_mtk.c
@@ -87,7 +87,17 @@ static struct sk_buff *mtk_tag_rcv(struct sk_buff *skb, struct net_device *dev,
 	return skb;
 }
 
+static int mtk_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto,
+				int *offset)
+{
+	*offset = 4;
+	*proto = ((__be16 *)skb->data)[1];
+
+	return 0;
+}
+
 const struct dsa_device_ops mtk_netdev_ops = {
-	.xmit	= mtk_tag_xmit,
-	.rcv	= mtk_tag_rcv,
+	.xmit		= mtk_tag_xmit,
+	.rcv		= mtk_tag_rcv,
+	.flow_dissect	= mtk_tag_flow_dissect,
 };