Commit e8fe177a authored by Juergen Beisert's avatar Juergen Beisert Committed by David S. Miller

net: dsa: add support for the SMSC-LAN9303 tagging format

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'.

This tag handler/filter depends on some hardware features which must be
enabled in the device to provide and make use of this special VLAN tag
to control the destination and the source of an ethernet packet.
Signed-off-by: default avatarJuergen Borleis <jbe@pengutronix.de>
Reviewed-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8dc7d11f
......@@ -33,6 +33,7 @@ enum dsa_tag_protocol {
DSA_TAG_PROTO_BRCM,
DSA_TAG_PROTO_QCA,
DSA_TAG_PROTO_MTK,
DSA_TAG_PROTO_LAN9303,
DSA_TAG_LAST, /* MUST BE LAST */
};
......
......@@ -33,4 +33,8 @@ config NET_DSA_TAG_QCA
config NET_DSA_TAG_MTK
bool
config NET_DSA_TAG_LAN9303
bool
endif
......@@ -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
......@@ -57,6 +57,9 @@ const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
#endif
#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,
};
......
......@@ -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
/*
* 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,
};
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