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.olt...@nxp.com>
---
net/dsa/tag_sja1105.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/net/dsa/tag_sja1105.c b/net/dsa/tag_sja1105.c
index 3710f9daa46d..57408bbd789b 100644
--- a/net/dsa/tag_sja1105.c
+++ b/net/dsa/tag_sja1105.c
@@ -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,
};
MODULE_LICENSE("GPL v2");
--
2.25.1
