When the flow dissector first sees packets coming in on a DSA devices the
802.3 header wont be located where the code expects it to be as the tag
is still present. Adding this new callback allows a DSA device to provide a
new function that the flow_dissector can use to get the correct protocol
and offset of the network header.

Signed-off-by: Muciri Gatimu <muc...@openmesh.com>
Signed-off-by: Shashidhar Lakkavalli <shashidhar.lakkava...@openmesh.com>
Signed-off-by: John Crispin <j...@phrozen.org>
 include/net/dsa.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 65d7804c6f69..7f46b521313e 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -106,6 +106,8 @@ struct dsa_device_ops {
        struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev,
                               struct packet_type *pt,
                               struct net_device *orig_dev);
+       int (*flow_dissect)(const struct sk_buff *skb, __be16 *proto,
+                           int *offset);
 struct dsa_switch_tree {

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