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193 lines
5.1 KiB
Diff
193 lines
5.1 KiB
Diff
From 5c01c03920c63630864d2b8641924a8c7c6cb62f Mon Sep 17 00:00:00 2001
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From: Sean Wang <sean.wang@mediatek.com>
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Date: Wed, 29 Mar 2017 17:38:20 +0800
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Subject: [PATCH 28/57] net-next: dsa: add Mediatek tag RX/TX handler
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Add the support for the 4-bytes tag for DSA port distinguishing inserted
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allowing receiving and transmitting the packet via the particular port.
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The tag is being added after the source MAC address in the ethernet
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header.
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Signed-off-by: Sean Wang <sean.wang@mediatek.com>
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Signed-off-by: Landen Chao <Landen.Chao@mediatek.com>
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Reviewed-by: Andrew Lunn <andrew@lunn.ch>
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Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
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---
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include/net/dsa.h | 1 +
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net/dsa/Kconfig | 2 +
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net/dsa/Makefile | 1 +
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net/dsa/dsa.c | 3 ++
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net/dsa/dsa_priv.h | 3 ++
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net/dsa/tag_mtk.c | 117 +++++++++++++++++++++++++++++++++++++++++++++++++++++
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6 files changed, 127 insertions(+)
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create mode 100644 net/dsa/tag_mtk.c
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--- a/include/net/dsa.h
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+++ b/include/net/dsa.h
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@@ -27,6 +27,7 @@ enum dsa_tag_protocol {
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DSA_TAG_PROTO_EDSA,
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DSA_TAG_PROTO_BRCM,
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DSA_TAG_PROTO_QCA,
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+ DSA_TAG_PROTO_MTK,
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DSA_TAG_LAST, /* MUST BE LAST */
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};
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--- a/net/dsa/Kconfig
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+++ b/net/dsa/Kconfig
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@@ -42,4 +42,6 @@ config NET_DSA_TAG_TRAILER
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config NET_DSA_TAG_QCA
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bool
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+config NET_DSA_TAG_MTK
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+ bool
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endif
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--- a/net/dsa/Makefile
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+++ b/net/dsa/Makefile
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@@ -8,3 +8,4 @@ dsa_core-$(CONFIG_NET_DSA_TAG_DSA) += ta
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dsa_core-$(CONFIG_NET_DSA_TAG_EDSA) += tag_edsa.o
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dsa_core-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o
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dsa_core-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o
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+dsa_core-$(CONFIG_NET_DSA_TAG_MTK) += tag_mtk.o
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--- a/net/dsa/dsa.c
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+++ b/net/dsa/dsa.c
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@@ -57,6 +57,9 @@ const struct dsa_device_ops *dsa_device_
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#ifdef CONFIG_NET_DSA_TAG_QCA
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[DSA_TAG_PROTO_QCA] = &qca_netdev_ops,
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#endif
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+#ifdef CONFIG_NET_DSA_TAG_MTK
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+ [DSA_TAG_PROTO_MTK] = &mtk_netdev_ops,
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+#endif
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[DSA_TAG_PROTO_NONE] = &none_ops,
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};
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--- a/net/dsa/dsa_priv.h
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+++ b/net/dsa/dsa_priv.h
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@@ -84,4 +84,7 @@ extern const struct dsa_device_ops brcm_
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/* tag_qca.c */
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extern const struct dsa_device_ops qca_netdev_ops;
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+/* tag_mtk.c */
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+extern const struct dsa_device_ops mtk_netdev_ops;
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+
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#endif
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--- /dev/null
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+++ b/net/dsa/tag_mtk.c
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@@ -0,0 +1,117 @@
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+/*
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+ * Mediatek DSA Tag support
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+ * Copyright (C) 2017 Landen Chao <landen.chao@mediatek.com>
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+ * Sean Wang <sean.wang@mediatek.com>
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 and
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+ * only version 2 as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+
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+#include <linux/etherdevice.h>
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+#include "dsa_priv.h"
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+
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+#define MTK_HDR_LEN 4
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+#define MTK_HDR_RECV_SOURCE_PORT_MASK GENMASK(2, 0)
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+#define MTK_HDR_XMIT_DP_BIT_MASK GENMASK(5, 0)
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+
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+static struct sk_buff *mtk_tag_xmit(struct sk_buff *skb,
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+ struct net_device *dev)
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+{
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+ struct dsa_slave_priv *p = netdev_priv(dev);
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+ u8 *mtk_tag;
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+
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+ if (skb_cow_head(skb, MTK_HDR_LEN) < 0)
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+ goto out_free;
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+
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+ skb_push(skb, MTK_HDR_LEN);
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+
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+ memmove(skb->data, skb->data + MTK_HDR_LEN, 2 * ETH_ALEN);
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+
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+ /* Build the tag after the MAC Source Address */
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+ mtk_tag = skb->data + 2 * ETH_ALEN;
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+ mtk_tag[0] = 0;
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+ mtk_tag[1] = (1 << p->dp->index) & MTK_HDR_XMIT_DP_BIT_MASK;
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+ mtk_tag[2] = 0;
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+ mtk_tag[3] = 0;
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+
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+ return skb;
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+
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+out_free:
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+ kfree_skb(skb);
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+ return NULL;
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+}
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+
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+static int mtk_tag_rcv(struct sk_buff *skb, struct net_device *dev,
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+ struct packet_type *pt, struct net_device *orig_dev)
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+{
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+ struct dsa_switch_tree *dst = dev->dsa_ptr;
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+ struct dsa_switch *ds;
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+ int port;
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+ __be16 *phdr, hdr;
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+
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+ if (unlikely(!dst))
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+ goto out_drop;
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+
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+ skb = skb_unshare(skb, GFP_ATOMIC);
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+ if (!skb)
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+ goto out;
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+
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+ if (unlikely(!pskb_may_pull(skb, MTK_HDR_LEN)))
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+ goto out_drop;
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+
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+ /* The MTK header is added by the switch between src addr
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+ * and ethertype at this point, skb->data points to 2 bytes
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+ * after src addr so header should be 2 bytes right before.
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+ */
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+ phdr = (__be16 *)(skb->data - 2);
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+ hdr = ntohs(*phdr);
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+
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+ /* Remove MTK tag and recalculate checksum. */
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+ skb_pull_rcsum(skb, MTK_HDR_LEN);
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+
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+ memmove(skb->data - ETH_HLEN,
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+ skb->data - ETH_HLEN - MTK_HDR_LEN,
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+ 2 * ETH_ALEN);
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+
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+ /* This protocol doesn't support cascading multiple
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+ * switches so it's safe to assume the switch is first
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+ * in the tree.
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+ */
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+ ds = dst->ds[0];
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+ if (!ds)
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+ goto out_drop;
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+
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+ /* Get source port information */
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+ port = (hdr & MTK_HDR_RECV_SOURCE_PORT_MASK);
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+ if (!ds->ports[port].netdev)
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+ goto out_drop;
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+
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+ /* Update skb & forward the frame accordingly */
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+ skb_push(skb, ETH_HLEN);
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+
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+ skb->pkt_type = PACKET_HOST;
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+ skb->dev = ds->ports[port].netdev;
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+ skb->protocol = eth_type_trans(skb, skb->dev);
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+
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+ skb->dev->stats.rx_packets++;
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+ skb->dev->stats.rx_bytes += skb->len;
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+
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+ netif_receive_skb(skb);
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+
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+ return 0;
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+
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+out_drop:
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+ kfree_skb(skb);
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+out:
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+ return 0;
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+}
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+
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+const struct dsa_device_ops mtk_netdev_ops = {
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+ .xmit = mtk_tag_xmit,
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+ .rcv = mtk_tag_rcv,
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+};
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