[PATCH v3 net-next 14/15] net: dsa: tag_sja1105: use a custom flow dissector procedure
From: Vladimir Oltean <vladimir.oltean@nxp.com>
Date: 2020-09-26 19:33:48
Subsystem:
networking [dsa], networking [general], the rest · Maintainers:
Andrew Lunn, Vladimir Oltean, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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> --- Changes in v3: None. 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 36ebd5878061..50496013cdb7 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, .promisc_on_master = true, };
--
2.25.1