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net: dsa: add KSZ9893 switch tagging support

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KSZ9893 switch is similar to KSZ9477 switch except the ingress tail tag
has 1 byte instead of 2 bytes.  The size of the portmap is smaller and
so the override and lookup bits are also moved.

Signed-off-by: Tristram Ha <Tristram.Ha@microchip.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tristram Ha 2019-02-28 19:57:23 -08:00 committed by David S. Miller
parent a1c0ed24fe
commit 88b573af91
4 changed files with 38 additions and 0 deletions
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1
include/net/dsa.h
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@ -38,6 +38,7 @@ enum dsa_tag_protocol {
DSA_TAG_PROTO_EDSA,
DSA_TAG_PROTO_GSWIP,
DSA_TAG_PROTO_KSZ9477,
DSA_TAG_PROTO_KSZ9893,
DSA_TAG_PROTO_LAN9303,
DSA_TAG_PROTO_MTK,
DSA_TAG_PROTO_QCA,

2
net/dsa/dsa.c
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@ -57,6 +57,7 @@ const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
#endif
#ifdef CONFIG_NET_DSA_TAG_KSZ9477
[DSA_TAG_PROTO_KSZ9477] = &ksz9477_netdev_ops,
[DSA_TAG_PROTO_KSZ9893] = &ksz9893_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_LAN9303
[DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops,
@ -93,6 +94,7 @@ const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops)
#endif
#ifdef CONFIG_NET_DSA_TAG_KSZ9477
[DSA_TAG_PROTO_KSZ9477] = "ksz9477",
[DSA_TAG_PROTO_KSZ9893] = "ksz9893",
#endif
#ifdef CONFIG_NET_DSA_TAG_LAN9303
[DSA_TAG_PROTO_LAN9303] = "lan9303",

1
net/dsa/dsa_priv.h
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@ -216,6 +216,7 @@ extern const struct dsa_device_ops gswip_netdev_ops;
/* tag_ksz.c */
extern const struct dsa_device_ops ksz9477_netdev_ops;
extern const struct dsa_device_ops ksz9893_netdev_ops;
/* tag_lan9303.c */
extern const struct dsa_device_ops lan9303_netdev_ops;

34
net/dsa/tag_ksz.c
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@ -16,6 +16,7 @@
/* Typically only one byte is used for tail tag. */
#define KSZ_EGRESS_TAG_LEN 1
#define KSZ_INGRESS_TAG_LEN 1
static struct sk_buff *ksz_common_xmit(struct sk_buff *skb,
struct net_device *dev, int len)
@ -141,3 +142,36 @@ const struct dsa_device_ops ksz9477_netdev_ops = {
.rcv = ksz9477_rcv,
.overhead = KSZ9477_INGRESS_TAG_LEN,
};
#define KSZ9893_TAIL_TAG_OVERRIDE BIT(5)
#define KSZ9893_TAIL_TAG_LOOKUP BIT(6)
static struct sk_buff *ksz9893_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct dsa_port *dp = dsa_slave_to_port(dev);
struct sk_buff *nskb;
u8 *addr;
u8 *tag;
nskb = ksz_common_xmit(skb, dev, KSZ_INGRESS_TAG_LEN);
if (!nskb)
return NULL;
/* Tag encoding */
tag = skb_put(nskb, KSZ_INGRESS_TAG_LEN);
addr = skb_mac_header(nskb);
*tag = BIT(dp->index);
if (is_link_local_ether_addr(addr))
*tag |= KSZ9893_TAIL_TAG_OVERRIDE;
return nskb;
}
const struct dsa_device_ops ksz9893_netdev_ops = {
.xmit = ksz9893_xmit,
.rcv = ksz9477_rcv,
.overhead = KSZ_INGRESS_TAG_LEN,
};