devlink: Add overlay source MAC is multicast trap

Add packet trap that can report NVE packets that the device decided to
drop because their overlay source MAC is multicast.

Signed-off-by: Amit Cohen <amitc@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/devlink.c b/net/core/devlink.c
index af85fcd..e5b19bd 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -7708,6 +7708,7 @@ static const struct devlink_trap devlink_trap_generic[] = {
 	DEVLINK_TRAP(IPV6_LPM_UNICAST_MISS, EXCEPTION),
 	DEVLINK_TRAP(NON_ROUTABLE, DROP),
 	DEVLINK_TRAP(DECAP_ERROR, EXCEPTION),
+	DEVLINK_TRAP(OVERLAY_SMAC_MC, DROP),
 };
 
 #define DEVLINK_TRAP_GROUP(_id)						      \