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net: dsa: tag_sja1105: use a custom flow dissector procedure 

The sja1105 is a bit of a special snowflake, in that not all frames are
transmitted/received in the same way. L2 link-local frames are received
with the source port/switch ID information put in the destination MAC
address. For the rest, a tag_8021q header is used. So only the latter
frames displace the rest of the headers and need to use the generic flow
dissector procedure.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean 2020-09-26 22:32:14 +03:00 committed by David S. Miller
parent 6b04f171dc
commit e665297983
1 changed files with 11 additions and 0 deletions
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11
net/dsa/tag_sja1105.c
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@ -346,6 +346,16 @@ static struct sk_buff *sja1105_rcv(struct sk_buff *skb,
is_meta);
}
static void sja1105_flow_dissect(const struct sk_buff *skb, __be16 *proto,
int *offset)
{
/* No tag added for management frames, all ok */
if (unlikely(sja1105_is_link_local(skb)))
return;
dsa_tag_generic_flow_dissect(skb, proto, offset);
}
static const struct dsa_device_ops sja1105_netdev_ops = {
.name = "sja1105",
.proto = DSA_TAG_PROTO_SJA1105,
@ -353,6 +363,7 @@ static const struct dsa_device_ops sja1105_netdev_ops = {
.rcv = sja1105_rcv,
.filter = sja1105_filter,
.overhead = VLAN_HLEN,
.flow_dissect = sja1105_flow_dissect,
.promisc_on_master = true,
};