diff --git a/include/net/dsa.h b/include/net/dsa.h
index 4e13e69..3276547 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -31,6 +31,7 @@ enum dsa_tag_protocol {
 	DSA_TAG_PROTO_EDSA,
 	DSA_TAG_PROTO_BRCM,
 	DSA_TAG_PROTO_QCA,
+	DSA_TAG_PROTO_MTK,
 	DSA_TAG_LAST,		/* MUST BE LAST */
 };
 
diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
index 9649238..d78789b 100644
--- a/net/dsa/Kconfig
+++ b/net/dsa/Kconfig
@@ -31,4 +31,6 @@ config NET_DSA_TAG_TRAILER
 config NET_DSA_TAG_QCA
 	bool
 
+config NET_DSA_TAG_MTK
+	bool
 endif
diff --git a/net/dsa/Makefile b/net/dsa/Makefile
index 31d3437..9b1d478 100644
--- a/net/dsa/Makefile
+++ b/net/dsa/Makefile
@@ -8,3 +8,4 @@ dsa_core-$(CONFIG_NET_DSA_TAG_DSA) += tag_dsa.o
 dsa_core-$(CONFIG_NET_DSA_TAG_EDSA) += tag_edsa.o
 dsa_core-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o
 dsa_core-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o
+dsa_core-$(CONFIG_NET_DSA_TAG_MTK) += tag_mtk.o
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index b6d4f6a..617f736 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -53,6 +53,9 @@ static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
 #ifdef CONFIG_NET_DSA_TAG_QCA
 	[DSA_TAG_PROTO_QCA] = &qca_netdev_ops,
 #endif
+#ifdef CONFIG_NET_DSA_TAG_MTK
+	[DSA_TAG_PROTO_MTK] = &mtk_netdev_ops,
+#endif
 	[DSA_TAG_PROTO_NONE] = &none_ops,
 };
 
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index 0706a51..2a31399 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -85,4 +85,7 @@ int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
 /* tag_qca.c */
 extern const struct dsa_device_ops qca_netdev_ops;
 
+/* tag_mtk.c */
+extern const struct dsa_device_ops mtk_netdev_ops;
+
 #endif
diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c
new file mode 100644
index 0000000..44ae635
--- /dev/null
+++ b/net/dsa/tag_mtk.c
@@ -0,0 +1,118 @@
+/*
+ * Mediatek DSA Tag support
+ * Copyright (C) 2017 Landen Chao <landen.chao@mediatek.com>
+ *		      Sean Wang <sean.wang@mediatek.com>
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/etherdevice.h>
+#include <net/dsa.h>
+#include "dsa_priv.h"
+
+#define MTK_HDR_LEN		4
+#define MTK_HDR_RECV_SOURCE_PORT_MASK	GENMASK(2, 0)
+#define MTK_HDR_XMIT_DP_BIT_MASK	GENMASK(5, 0)
+
+static struct sk_buff *mtk_tag_xmit(struct sk_buff *skb,
+				    struct net_device *dev)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	u8 *mtk_tag;
+
+	if (skb_cow_head(skb, MTK_HDR_LEN) < 0)
+		goto out_free;
+
+	skb_push(skb, MTK_HDR_LEN);
+
+	memmove(skb->data, skb->data + MTK_HDR_LEN, 2 * ETH_ALEN);
+
+	/* Build the tag after the MAC Source Address */
+	mtk_tag = skb->data + 2 * ETH_ALEN;
+	mtk_tag[0] = 0;
+	mtk_tag[1] = (1 << p->dp->index) & MTK_HDR_XMIT_DP_BIT_MASK;
+	mtk_tag[2] = 0;
+	mtk_tag[3] = 0;
+
+	return skb;
+
+out_free:
+	kfree_skb(skb);
+	return NULL;
+}
+
+static int mtk_tag_rcv(struct sk_buff *skb, struct net_device *dev,
+		       struct packet_type *pt, struct net_device *orig_dev)
+{
+	struct dsa_switch_tree *dst = dev->dsa_ptr;
+	struct dsa_switch *ds;
+	int port;
+	__be16 *phdr, hdr;
+
+	if (unlikely(!dst))
+		goto out_drop;
+
+	skb = skb_unshare(skb, GFP_ATOMIC);
+	if (!skb)
+		goto out;
+
+	if (unlikely(!pskb_may_pull(skb, MTK_HDR_LEN)))
+		goto out_drop;
+
+	/* The MTK header is added by the switch between src addr
+	 * and ethertype at this point, skb->data points to 2 bytes
+	 * after src addr so header should be 2 bytes right before.
+	 */
+	phdr = (__be16 *)(skb->data - 2);
+	hdr = ntohs(*phdr);
+
+	/* Remove MTK tag and recalculate checksum. */
+	skb_pull_rcsum(skb, MTK_HDR_LEN);
+
+	memmove(skb->data - ETH_HLEN,
+		skb->data - ETH_HLEN - MTK_HDR_LEN,
+		2 * ETH_ALEN);
+
+	/* This protocol doesn't support cascading multiple
+	 * switches so it's safe to assume the switch is first
+	 * in the tree.
+	 */
+	ds = dst->ds[0];
+	if (!ds)
+		goto out_drop;
+
+	/* Get source port information */
+	port = (hdr & MTK_HDR_RECV_SOURCE_PORT_MASK);
+	if (!ds->ports[port].netdev)
+		goto out_drop;
+
+	/* Update skb & forward the frame accordingly */
+	skb_push(skb, ETH_HLEN);
+
+	skb->pkt_type = PACKET_HOST;
+	skb->dev = ds->ports[port].netdev;
+	skb->protocol = eth_type_trans(skb, skb->dev);
+
+	skb->dev->stats.rx_packets++;
+	skb->dev->stats.rx_bytes += skb->len;
+
+	netif_receive_skb(skb);
+
+	return 0;
+
+out_drop:
+	kfree_skb(skb);
+out:
+	return 0;
+}
+
+const struct dsa_device_ops mtk_netdev_ops = {
+	.xmit	= mtk_tag_xmit,
+	.rcv	= mtk_tag_rcv,
+};
