ar71xx: add QinQ tagging format for the DSA driver

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19926 3c298f89-4303-0410-b956-a3cf2f4a3e73

3 files changed, 207 insertions, 0 deletions

diff --git a/target/linux/ar71xx/config-2.6.32 b/target/linux/ar71xx/config-2.6.32
index 1c193b277..f4b1184a8 100644
--- a/target/linux/ar71xx/config-2.6.32
+++ b/target/linux/ar71xx/config-2.6.32
@@ -173,6 +173,7 @@ CONFIG_NET_DSA_MV88E6063=y
 # CONFIG_NET_DSA_MV88E6XXX_NEED_PPU is not set
 # CONFIG_NET_DSA_TAG_DSA is not set
 # CONFIG_NET_DSA_TAG_EDSA is not set
+CONFIG_NET_DSA_TAG_QINQ=y
 CONFIG_NET_DSA_TAG_TRAILER=y
 # CONFIG_NO_IOPORT is not set
 # CONFIG_NXP_STB220 is not set
diff --git a/target/linux/ar71xx/files/net/dsa/tag_qinq.c b/target/linux/ar71xx/files/net/dsa/tag_qinq.c
new file mode 100644
index 000000000..68bcc3828
--- /dev/null
+++ b/target/linux/ar71xx/files/net/dsa/tag_qinq.c
@@ -0,0 +1,127 @@
+/*
+ * net/dsa/tag_qinq.c - QinQ tag format handling
+ * Copyright (c) 2010 Gabor Juhos <juhosg@openwrt.org>
+ *
+ *  This file was based on:
+ *    net/dsa/tag_edsa.c - Ethertype DSA tagging
+ *    Copyright (c) 2008-2009 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 <linux/if_vlan.h>
+
+#include "dsa_priv.h"
+
+netdev_tx_t qinq_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct vlan_ethhdr *veth;
+	unsigned int len;
+	int ret;
+
+	if (skb_cow_head(skb, VLAN_HLEN) < 0)
+		goto out_free_skb;
+
+	veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
+
+	/* Move the mac addresses to the beginning of the new header. */
+	memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN);
+	skb->mac_header -= VLAN_HLEN;
+
+	/* setup VLAN header fields */
+	veth->h_vlan_proto = htons(ETH_P_QINQ);
+	veth->h_vlan_TCI = htons(p->port);
+
+	len = skb->len;
+	skb->protocol = htons(ETH_P_QINQ);
+	skb->dev = p->parent->dst->master_netdev;
+
+	ret = dev_queue_xmit(skb);
+	if (unlikely(ret != NET_XMIT_SUCCESS))
+		goto out_dropped;
+
+	dev->stats.tx_packets++;
+	dev->stats.tx_bytes += len;
+
+	return NETDEV_TX_OK;
+
+ out_free_skb:
+	kfree_skb(skb);
+ out_dropped:
+	dev->stats.tx_dropped++;
+	return NETDEV_TX_OK;
+}
+
+static int qinq_rcv(struct sk_buff *skb, struct net_device *dev,
+		    struct packet_type *pt, struct net_device *orig_dev)
+{
+	struct dsa_switch_tree *dst;
+	struct dsa_switch *ds;
+	struct vlan_hdr *vhdr;
+	int source_port;
+
+	dst = dev->dsa_ptr;
+	if (unlikely(dst == NULL))
+		goto out_drop;
+	ds = dst->ds[0];
+
+	skb = skb_unshare(skb, GFP_ATOMIC);
+	if (skb == NULL)
+		goto out;
+
+	if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
+		goto out_drop;
+
+	vhdr = (struct vlan_hdr *)skb->data;
+	source_port = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
+	if (source_port >= DSA_MAX_PORTS || ds->ports[source_port] == NULL)
+		goto out_drop;
+
+	/* Remove the outermost VLAN tag and update checksum. */
+	skb_pull_rcsum(skb, VLAN_HLEN);
+	memmove(skb->data - ETH_HLEN,
+		skb->data - ETH_HLEN - VLAN_HLEN,
+		2 * ETH_ALEN);
+
+	skb->dev = ds->ports[source_port];
+	skb_push(skb, ETH_HLEN);
+	skb->pkt_type = PACKET_HOST;
+	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;
+}
+
+static struct packet_type qinq_packet_type __read_mostly = {
+	.type	= cpu_to_be16(ETH_P_QINQ),
+	.func	= qinq_rcv,
+};
+
+static int __init qinq_init_module(void)
+{
+	dev_add_pack(&qinq_packet_type);
+	return 0;
+}
+module_init(qinq_init_module);
+
+static void __exit qinq_cleanup_module(void)
+{
+	dev_remove_pack(&qinq_packet_type);
+}
+module_exit(qinq_cleanup_module);
diff --git a/target/linux/ar71xx/patches-2.6.32/122-dsa-add-qinq-tagging-format.patch b/target/linux/ar71xx/patches-2.6.32/122-dsa-add-qinq-tagging-format.patch
new file mode 100644
index 000000000..dc03fd6eb
--- /dev/null
+++ b/target/linux/ar71xx/patches-2.6.32/122-dsa-add-qinq-tagging-format.patch
@@ -0,0 +1,79 @@
+--- a/include/linux/if_ether.h
++++ b/include/linux/if_ether.h
+@@ -81,6 +81,7 @@
+ #define ETH_P_1588	0x88F7		/* IEEE 1588 Timesync */
+ #define ETH_P_FCOE	0x8906		/* Fibre Channel over Ethernet  */
+ #define ETH_P_FIP	0x8914		/* FCoE Initialization Protocol */
++#define ETH_P_QINQ	0x9100		/* QinQ VLAN Stacking Protocol */
+ #define ETH_P_EDSA	0xDADA		/* Ethertype DSA [ NOT AN OFFICIALLY REGISTERED ID ] */
+ 
+ /*
+--- a/net/dsa/dsa_priv.h
++++ b/net/dsa/dsa_priv.h
+@@ -174,6 +174,9 @@ netdev_tx_t dsa_xmit(struct sk_buff *skb
+ /* tag_edsa.c */
+ netdev_tx_t edsa_xmit(struct sk_buff *skb, struct net_device *dev);
+ 
++/* tag_qinq.c */
++netdev_tx_t qinq_xmit(struct sk_buff *skb, struct net_device *dev);
++
+ /* tag_trailer.c */
+ netdev_tx_t trailer_xmit(struct sk_buff *skb, struct net_device *dev);
+ 
+--- a/net/dsa/Kconfig
++++ b/net/dsa/Kconfig
+@@ -23,6 +23,10 @@ config NET_DSA_TAG_TRAILER
+ 	bool
+ 	default n
+ 
++config NET_DSA_TAG_QINQ
++	bool
++	default y
++
+ 
+ # switch drivers
+ config NET_DSA_MV88E6XXX
+--- a/net/dsa/Makefile
++++ b/net/dsa/Makefile
+@@ -1,6 +1,7 @@
+ # tagging formats
+ obj-$(CONFIG_NET_DSA_TAG_DSA) += tag_dsa.o
+ obj-$(CONFIG_NET_DSA_TAG_EDSA) += tag_edsa.o
++obj-$(CONFIG_NET_DSA_TAG_QINQ) += tag_qinq.o
+ obj-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o
+ 
+ # switch drivers
+--- a/net/dsa/slave.c
++++ b/net/dsa/slave.c
+@@ -321,6 +321,19 @@ static const struct net_device_ops edsa_
+ 	.ndo_do_ioctl		= dsa_slave_ioctl,
+ };
+ #endif
++#ifdef CONFIG_NET_DSA_TAG_QINQ
++static const struct net_device_ops qinq_netdev_ops = {
++	.ndo_init		= dsa_slave_init,
++	.ndo_open	 	= dsa_slave_open,
++	.ndo_stop		= dsa_slave_close,
++	.ndo_start_xmit		= qinq_xmit,
++	.ndo_change_rx_flags	= dsa_slave_change_rx_flags,
++	.ndo_set_rx_mode	= dsa_slave_set_rx_mode,
++	.ndo_set_multicast_list = dsa_slave_set_rx_mode,
++	.ndo_set_mac_address	= dsa_slave_set_mac_address,
++	.ndo_do_ioctl		= dsa_slave_ioctl,
++};
++#endif
+ #ifdef CONFIG_NET_DSA_TAG_TRAILER
+ static const struct net_device_ops trailer_netdev_ops = {
+ 	.ndo_init		= dsa_slave_init,
+@@ -366,6 +379,11 @@ dsa_slave_create(struct dsa_switch *ds, 
+ 		slave_dev->netdev_ops = &edsa_netdev_ops;
+ 		break;
+ #endif
++#ifdef CONFIG_NET_DSA_TAG_QINQ
++	case htons(ETH_P_QINQ):
++		slave_dev->netdev_ops = &qinq_netdev_ops;
++		break;
++#endif
+ #ifdef CONFIG_NET_DSA_TAG_TRAILER
+ 	case htons(ETH_P_TRAILER):
+ 		slave_dev->netdev_ops = &trailer_netdev_ops;