When many parallel flows are present and being received on the same
RX queue, GRO processing can become expensive because each incoming
frame must traverse the per-NAPI GRO list at each protocol layer
of GRO receive (eth --> ipv{4,6} --> tcp).Use the already computed hash to chain these SKBs in a hash table instead of a simple list. The first patch makes the GRO list a true list_head. The second patch implements the hash table. This series patches basic testing and I added some diagnostics to make sure we really were aggregating GRO frames :-) Signed-off-by: David S. Miller <da...@davemloft.net>
