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-rw-r--r--include/net/dsa.h1
-rw-r--r--net/dsa/Kconfig2
-rw-r--r--net/dsa/Makefile1
-rw-r--r--net/dsa/dsa.c3
-rw-r--r--net/dsa/dsa_priv.h3
-rw-r--r--net/dsa/tag_mtk.c118
6 files changed, 128 insertions, 0 deletions
diff --git a/include/net/dsa.h b/include/net/dsa.h
index ffe56cc338fe..7ba9b1fb565c 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -32,6 +32,7 @@ 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 da4d64f432db..aa21f49f1215 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 31d343796251..9b1d478f3713 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 95d1a756202c..6cad15da5892 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -54,6 +54,9 @@ const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
#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 0706a511244e..2a3139921811 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -85,4 +85,7 @@ extern const struct dsa_device_ops brcm_netdev_ops;
/* 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 000000000000..44ae6353a521
--- /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,
+};