diff --git a/include/linux/if_ether.h b/include/linux/if_ether.h
index a85f5a2..864982b 100644
--- a/include/linux/if_ether.h
+++ b/include/linux/if_ether.h
@@ -100,6 +100,7 @@
 #define ETH_P_ECONET	0x0018		/* Acorn Econet			*/
 #define ETH_P_HDLC	0x0019		/* HDLC frames			*/
 #define ETH_P_ARCNET	0x001A		/* 1A for ArcNet :-)            */
+#define ETH_P_DSA	0x001B		/* Distributed Switch Arch.	*/
 
 /*
  *	This is an Ethernet frame header.
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index f67435d..5226308 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -42,6 +42,7 @@
 #include <linux/workqueue.h>
 
 #include <net/net_namespace.h>
+#include <net/dsa.h>
 
 struct vlan_group;
 struct ethtool_ops;
@@ -801,6 +802,16 @@ void dev_net_set(struct net_device *dev, struct net *net)
 #endif
 }
 
+static inline int netdev_uses_dsa_tags(struct net_device *dev)
+{
+#ifdef CONFIG_NET_DSA_TAG_DSA
+	if (dev->dsa_ptr != NULL)
+		return dsa_uses_dsa_tags(dev->dsa_ptr);
+#endif
+
+	return 0;
+}
+
 /**
  *	netdev_priv - access network device private data
  *	@dev: network device
diff --git a/include/net/dsa.h b/include/net/dsa.h
index 96eb2f3..a331f64 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -20,5 +20,7 @@ struct dsa_platform_data {
 	char		*port_names[DSA_MAX_PORTS];
 };
 
+int dsa_uses_dsa_tags(void *dsa_ptr);
+
 
 #endif
diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
index 7cf55e5..6b68016 100644
--- a/net/dsa/Kconfig
+++ b/net/dsa/Kconfig
@@ -10,6 +10,10 @@ menuconfig NET_DSA
 if NET_DSA
 
 # tagging formats
+config NET_DSA_TAG_DSA
+	bool
+	default n
+
 config NET_DSA_TAG_EDSA
 	bool
 	default n
diff --git a/net/dsa/Makefile b/net/dsa/Makefile
index b59a6f6..8b92123 100644
--- a/net/dsa/Makefile
+++ b/net/dsa/Makefile
@@ -1,4 +1,5 @@
 # tagging formats
+obj-$(CONFIG_NET_DSA_TAG_DSA) += tag_dsa.o
 obj-$(CONFIG_NET_DSA_TAG_EDSA) += tag_edsa.o
 
 # switch drivers
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index a010e41..d16a66e 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -203,6 +203,22 @@ static void dsa_switch_destroy(struct dsa_switch *ds)
 }
 
 
+/* hooks for ethertype-less tagging formats *********************************/
+/*
+ * The original DSA tag format and some other tag formats have no
+ * ethertype, which means that we need to add a little hack to the
+ * networking receive path to make sure that received frames get
+ * the right ->protocol assigned to them when one of those tag
+ * formats is in use.
+ */
+int dsa_uses_dsa_tags(void *dsa_ptr)
+{
+	struct dsa_switch *ds = dsa_ptr;
+
+	return !!(ds->tag_type == TAG_TYPE_DSA);
+}
+
+
 /* link polling *************************************************************/
 static void dsa_link_poll_work(struct work_struct *ugly)
 {
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index 5233aba..385a380 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -18,6 +18,7 @@
 #include <net/dsa.h>
 
 enum dsa_tag_type {
+	TAG_TYPE_DSA,
 	TAG_TYPE_EDSA,
 };
 
@@ -101,6 +102,9 @@ void unregister_switch_driver(struct dsa_switch_driver *type);
 void dsa_slave_mii_bus_init(struct dsa_switch *ds);
 struct net_device *dsa_slave_create(struct dsa_switch *ds, int port);
 
+/* tag_dsa.c */
+int dsa_xmit(struct sk_buff *skb, struct net_device *dev);
+
 /* tag_edsa.c */
 int edsa_xmit(struct sk_buff *skb, struct net_device *dev);
 
diff --git a/net/dsa/mv88e6123_61_65.c b/net/dsa/mv88e6123_61_65.c
index b53233d..e8cc553 100644
--- a/net/dsa/mv88e6123_61_65.c
+++ b/net/dsa/mv88e6123_61_65.c
@@ -192,15 +192,18 @@ static int mv88e6123_61_65_setup_port(struct dsa_switch *ds, int p)
 
 	/*
 	 * Port Control: disable Drop-on-Unlock, disable Drop-on-Lock,
-	 * configure the EDSA tagging mode if this is the CPU port,
-	 * disable Header mode, enable IGMP/MLD snooping, disable VLAN
-	 * tunneling, determine priority by looking at 802.1p and IP
-	 * priority fields (IP prio has precedence), and set STP state
-	 * to Forwarding.  Finally, if this is the CPU port, additionally
-	 * enable forwarding of unknown unicast and multicast addresses.
+	 * configure the requested (DSA/EDSA) tagging mode if this is
+	 * the CPU port, disable Header mode, enable IGMP/MLD snooping,
+	 * disable VLAN tunneling, determine priority by looking at
+	 * 802.1p and IP priority fields (IP prio has precedence), and
+	 * set STP state to Forwarding.  Finally, if this is the CPU
+	 * port, additionally enable forwarding of unknown unicast and
+	 * multicast addresses.
 	 */
 	REG_WRITE(addr, 0x04,
-			(p == ds->cpu_port) ? 0x373f : 0x0433);
+			(p == ds->cpu_port) ?
+			 (ds->tag_type == TAG_TYPE_DSA) ? 0x053f : 0x373f :
+			 0x0433);
 
 	/*
 	 * Port Control 1: disable trunking.  Also, if this is the
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index afc8ef0..ac8ed09 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -238,6 +238,11 @@ struct net_device *dsa_slave_create(struct dsa_switch *ds, int port)
 	slave_dev->open = dsa_slave_open;
 	slave_dev->stop = dsa_slave_close;
 	switch (ds->tag_type) {
+#ifdef CONFIG_NET_DSA_TAG_DSA
+	case TAG_TYPE_DSA:
+		slave_dev->hard_start_xmit = dsa_xmit;
+		break;
+#endif
 #ifdef CONFIG_NET_DSA_TAG_EDSA
 	case TAG_TYPE_EDSA:
 		slave_dev->hard_start_xmit = edsa_xmit;
diff --git a/net/dsa/tag_dsa.c b/net/dsa/tag_dsa.c
new file mode 100644
index 0000000..63a79fa
--- /dev/null
+++ b/net/dsa/tag_dsa.c
@@ -0,0 +1,194 @@
+/*
+ * net/dsa/tag_dsa.c - (Non-ethertype) DSA tagging
+ * Copyright (c) 2008 Marvell Semiconductor
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/etherdevice.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include "dsa_priv.h"
+
+#define DSA_HLEN	4
+
+int dsa_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	char *dsa_header;
+
+	dev->stats.tx_packets++;
+	dev->stats.tx_bytes += skb->len;
+
+	/*
+	 * Convert the outermost 802.1q tag to a DSA tag for tagged
+	 * packets, or insert a DSA tag between the addresses and
+	 * the ethertype field for untagged packets.
+	 */
+	if (skb->protocol == htons(ETH_P_8021Q)) {
+		if (skb_cow_head(skb, 0) < 0)
+			goto out_free;
+
+		/*
+		 * Construct tagged FROM_CPU DSA tag from 802.1q tag.
+		 */
+		dsa_header = skb->data + 2 * ETH_ALEN;
+		dsa_header[0] = 0x60;
+		dsa_header[1] = p->port << 3;
+
+		/*
+		 * Move CFI field from byte 2 to byte 1.
+		 */
+		if (dsa_header[2] & 0x10) {
+			dsa_header[1] |= 0x01;
+			dsa_header[2] &= ~0x10;
+		}
+	} else {
+		if (skb_cow_head(skb, DSA_HLEN) < 0)
+			goto out_free;
+		skb_push(skb, DSA_HLEN);
+
+		memmove(skb->data, skb->data + DSA_HLEN, 2 * ETH_ALEN);
+
+		/*
+		 * Construct untagged FROM_CPU DSA tag.
+		 */
+		dsa_header = skb->data + 2 * ETH_ALEN;
+		dsa_header[0] = 0x40;
+		dsa_header[1] = p->port << 3;
+		dsa_header[2] = 0x00;
+		dsa_header[3] = 0x00;
+	}
+
+	skb->protocol = htons(ETH_P_DSA);
+
+	skb->dev = p->parent->master_dev;
+	dev_queue_xmit(skb);
+
+	return NETDEV_TX_OK;
+
+out_free:
+	kfree_skb(skb);
+	return NETDEV_TX_OK;
+}
+
+static int dsa_rcv(struct sk_buff *skb, struct net_device *dev,
+		   struct packet_type *pt, struct net_device *orig_dev)
+{
+	struct dsa_switch *ds = dev->dsa_ptr;
+	u8 *dsa_header;
+	int source_port;
+
+	if (unlikely(ds == NULL))
+		goto out_drop;
+
+	skb = skb_unshare(skb, GFP_ATOMIC);
+	if (skb == NULL)
+		goto out;
+
+	if (unlikely(!pskb_may_pull(skb, DSA_HLEN)))
+		goto out_drop;
+
+	/*
+	 * The ethertype field is part of the DSA header.
+	 */
+	dsa_header = skb->data - 2;
+
+	/*
+	 * Check that frame type is either TO_CPU or FORWARD, and
+	 * that the source device is zero.
+	 */
+	if ((dsa_header[0] & 0xdf) != 0x00 && (dsa_header[0] & 0xdf) != 0xc0)
+		goto out_drop;
+
+	/*
+	 * Check that the source port is a registered DSA port.
+	 */
+	source_port = (dsa_header[1] >> 3) & 0x1f;
+	if (source_port >= DSA_MAX_PORTS || ds->ports[source_port] == NULL)
+		goto out_drop;
+
+	/*
+	 * Convert the DSA header to an 802.1q header if the 'tagged'
+	 * bit in the DSA header is set.  If the 'tagged' bit is clear,
+	 * delete the DSA header entirely.
+	 */
+	if (dsa_header[0] & 0x20) {
+		u8 new_header[4];
+
+		/*
+		 * Insert 802.1q ethertype and copy the VLAN-related
+		 * fields, but clear the bit that will hold CFI (since
+		 * DSA uses that bit location for another purpose).
+		 */
+		new_header[0] = (ETH_P_8021Q >> 8) & 0xff;
+		new_header[1] = ETH_P_8021Q & 0xff;
+		new_header[2] = dsa_header[2] & ~0x10;
+		new_header[3] = dsa_header[3];
+
+		/*
+		 * Move CFI bit from its place in the DSA header to
+		 * its 802.1q-designated place.
+		 */
+		if (dsa_header[1] & 0x01)
+			new_header[2] |= 0x10;
+
+		/*
+		 * Update packet checksum if skb is CHECKSUM_COMPLETE.
+		 */
+		if (skb->ip_summed == CHECKSUM_COMPLETE) {
+			__wsum c = skb->csum;
+			c = csum_add(c, csum_partial(new_header + 2, 2, 0));
+			c = csum_sub(c, csum_partial(dsa_header + 2, 2, 0));
+			skb->csum = c;
+		}
+
+		memcpy(dsa_header, new_header, DSA_HLEN);
+	} else {
+		/*
+		 * Remove DSA tag and update checksum.
+		 */
+		skb_pull_rcsum(skb, DSA_HLEN);
+		memmove(skb->data - ETH_HLEN,
+			skb->data - ETH_HLEN - DSA_HLEN,
+			2 * ETH_ALEN);
+	}
+
+	skb->dev = ds->ports[source_port];
+	skb_push(skb, ETH_HLEN);
+	skb->protocol = eth_type_trans(skb, skb->dev);
+
+	skb->dev->last_rx = jiffies;
+	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;
+}
+
+static struct packet_type dsa_packet_type = {
+	.type	= __constant_htons(ETH_P_DSA),
+	.func	= dsa_rcv,
+};
+
+static int __init dsa_init_module(void)
+{
+	dev_add_pack(&dsa_packet_type);
+	return 0;
+}
+module_init(dsa_init_module);
+
+static void __exit dsa_cleanup_module(void)
+{
+	dev_remove_pack(&dsa_packet_type);
+}
+module_exit(dsa_cleanup_module);
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index a80839b..e0aca95 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -57,6 +57,7 @@
 #include <net/sock.h>
 #include <net/ipv6.h>
 #include <net/ip.h>
+#include <net/dsa.h>
 #include <asm/uaccess.h>
 #include <asm/system.h>
 
@@ -184,6 +185,15 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
 			skb->pkt_type = PACKET_OTHERHOST;
 	}
 
+	/*
+	 * Some variants of DSA tagging don't have an ethertype field
+	 * at all, so we check here whether one of those tagging
+	 * variants has been configured on the receiving interface,
+	 * and if so, set skb->protocol without looking at the packet.
+	 */
+	if (netdev_uses_dsa_tags(dev))
+		return htons(ETH_P_DSA);
+
 	if (ntohs(eth->h_proto) >= 1536)
 		return eth->h_proto;
 
