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-rw-r--r--net/dsa/Kconfig4
-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_lan9303.c141
5 files changed, 152 insertions, 0 deletions
diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
index aa21f49f1215..81a0868edb1d 100644
--- a/net/dsa/Kconfig
+++ b/net/dsa/Kconfig
@@ -33,4 +33,8 @@ config NET_DSA_TAG_QCA
config NET_DSA_TAG_MTK
bool
+
+config NET_DSA_TAG_LAN9303
+ bool
+
endif
diff --git a/net/dsa/Makefile b/net/dsa/Makefile
index 11a082d7e103..0b747d75e65a 100644
--- a/net/dsa/Makefile
+++ b/net/dsa/Makefile
@@ -9,3 +9,4 @@ 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
+dsa_core-$(CONFIG_NET_DSA_TAG_LAN9303) += tag_lan9303.o
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index e117047174fc..26130ae438da 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -58,6 +58,9 @@ const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
#ifdef CONFIG_NET_DSA_TAG_MTK
[DSA_TAG_PROTO_MTK] = &mtk_netdev_ops,
#endif
+#ifdef CONFIG_NET_DSA_TAG_LAN9303
+ [DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops,
+#endif
[DSA_TAG_PROTO_NONE] = &none_ops,
};
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index ab397c07880f..f4a88e485213 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -93,4 +93,7 @@ extern const struct dsa_device_ops qca_netdev_ops;
/* tag_mtk.c */
extern const struct dsa_device_ops mtk_netdev_ops;
+/* tag_lan9303.c */
+extern const struct dsa_device_ops lan9303_netdev_ops;
+
#endif
diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
new file mode 100644
index 000000000000..563b6c8fe445
--- /dev/null
+++ b/net/dsa/tag_lan9303.c
@@ -0,0 +1,141 @@
+/*
+ * Copyright (C) 2017 Pengutronix, Juergen Borleis <jbe@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * 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 <linux/list.h>
+#include <linux/slab.h>
+#include <net/dsa.h>
+#include "dsa_priv.h"
+
+/* To define the outgoing port and to discover the incoming port a regular
+ * VLAN tag is used by the LAN9303. But its VID meaning is 'special':
+ *
+ * Dest MAC Src MAC TAG Type
+ * ...| 1 2 3 4 5 6 | 1 2 3 4 5 6 | 1 2 3 4 | 1 2 |...
+ * |<------->|
+ * TAG:
+ * |<------------->|
+ * | 1 2 | 3 4 |
+ * TPID VID
+ * 0x8100
+ *
+ * VID bit 3 indicates a request for an ALR lookup.
+ *
+ * If VID bit 3 is zero, then bits 0 and 1 specify the destination port
+ * (0, 1, 2) or broadcast (3) or the source port (1, 2).
+ *
+ * VID bit 4 is used to specify if the STP port state should be overridden.
+ * Required when no forwarding between the external ports should happen.
+ */
+
+#define LAN9303_TAG_LEN 4
+#define LAN9303_MAX_PORTS 3
+
+static struct sk_buff *lan9303_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct dsa_slave_priv *p = netdev_priv(dev);
+ u16 *lan9303_tag;
+
+ /* insert a special VLAN tag between the MAC addresses
+ * and the current ethertype field.
+ */
+ if (skb_cow_head(skb, LAN9303_TAG_LEN) < 0) {
+ dev_dbg(&dev->dev,
+ "Cannot make room for the special tag. Dropping packet\n");
+ goto out_free;
+ }
+
+ /* provide 'LAN9303_TAG_LEN' bytes additional space */
+ skb_push(skb, LAN9303_TAG_LEN);
+
+ /* make room between MACs and Ether-Type */
+ memmove(skb->data, skb->data + LAN9303_TAG_LEN, 2 * ETH_ALEN);
+
+ lan9303_tag = (u16 *)(skb->data + 2 * ETH_ALEN);
+ lan9303_tag[0] = htons(ETH_P_8021Q);
+ lan9303_tag[1] = htons(p->dp->index | BIT(4));
+
+ return skb;
+out_free:
+ kfree_skb(skb);
+ return NULL;
+}
+
+static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev,
+ struct packet_type *pt, struct net_device *orig_dev)
+{
+ u16 *lan9303_tag;
+ struct dsa_switch_tree *dst = dev->dsa_ptr;
+ struct dsa_switch *ds;
+ unsigned int source_port;
+
+ if (unlikely(!dst)) {
+ dev_warn_ratelimited(&dev->dev, "Dropping packet, due to missing switch tree device\n");
+ return NULL;
+ }
+
+ ds = dst->ds[0];
+
+ if (unlikely(!ds)) {
+ dev_warn_ratelimited(&dev->dev, "Dropping packet, due to missing DSA switch device\n");
+ return NULL;
+ }
+
+ if (unlikely(!pskb_may_pull(skb, LAN9303_TAG_LEN))) {
+ dev_warn_ratelimited(&dev->dev,
+ "Dropping packet, cannot pull\n");
+ return NULL;
+ }
+
+ /* '->data' points into the middle of our special VLAN tag information:
+ *
+ * ~ MAC src | 0x81 | 0x00 | 0xyy | 0xzz | ether type
+ * ^
+ * ->data
+ */
+ lan9303_tag = (u16 *)(skb->data - 2);
+
+ if (lan9303_tag[0] != htons(ETH_P_8021Q)) {
+ dev_warn_ratelimited(&dev->dev, "Dropping packet due to invalid VLAN marker\n");
+ return NULL;
+ }
+
+ source_port = ntohs(lan9303_tag[1]) & 0x3;
+
+ if (source_port >= LAN9303_MAX_PORTS) {
+ dev_warn_ratelimited(&dev->dev, "Dropping packet due to invalid source port\n");
+ return NULL;
+ }
+
+ if (!ds->ports[source_port].netdev) {
+ dev_warn_ratelimited(&dev->dev, "Dropping packet due to invalid netdev or device\n");
+ return NULL;
+ }
+
+ /* remove the special VLAN tag between the MAC addresses
+ * and the current ethertype field.
+ */
+ skb_pull_rcsum(skb, 2 + 2);
+ memmove(skb->data - ETH_HLEN, skb->data - (ETH_HLEN + LAN9303_TAG_LEN),
+ 2 * ETH_ALEN);
+
+ /* forward the packet to the dedicated interface */
+ skb->dev = ds->ports[source_port].netdev;
+
+ return skb;
+}
+
+const struct dsa_device_ops lan9303_netdev_ops = {
+ .xmit = lan9303_xmit,
+ .rcv = lan9303_rcv,
+};