net: create tcp_gro_lookup helper function
This pulls the flow port matching out of tcp_gro_receive, so that it can be reused for the next change, which adds the TCP fraglist GRO heuristic. Acked-by:Paolo Abeni <pabeni@redhat.com> Reviewed-by:
Eric Dumazet <edumazet@google.com> Signed-off-by:
Felix Fietkau <nbd@nbd.name> Reviewed-by:
David Ahern <dsahern@kernel.org> Reviewed-by:
Willem de Bruijn <willemb@google.com> Signed-off-by:
Paolo Abeni <pabeni@redhat.com>
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