igmp: hash a hash table to speedup ip_check_mc_rcu()
After IP route cache removal, multicast applications using a lot of multicast addresses hit a O(N) behavior in ip_check_mc_rcu() Add a per in_device hash table to get faster lookup. This hash table is created only if the number of items in mc_list is above 4. Reported-by: NShawn Bohrer <sbohrer@rgmadvisors.com> Signed-off-by: NEric Dumazet <edumazet@google.com> Tested-by: NShawn Bohrer <sbohrer@rgmadvisors.com> Reviewed-by: NCong Wang <xiyou.wangcong@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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