Thread (26 messages) 26 messages, 4 authors, 2020-09-30
STALE2080d
Revisions (2)
  1. v2 [diff vs current]
  2. v3 current

[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
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