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    ipv6: add ipv6_addr_hash() helper · ddbe5032
    Eric Dumazet authored
    Introduce ipv6_addr_hash() helper doing a XOR on all bits
    of an IPv6 address, with an optimized x86_64 version.
    Use it in flow dissector, as suggested by Andrew McGregor,
    to reduce hash collision probabilities in fq_codel (and other
    users of flow dissector)
    Use it in ip6_tunnel.c and use more bit shuffling, as suggested
    by David Laight, as existing hash was ignoring most of them.
    Use it in sunrpc and use more bit shuffling, using hash_32().
    Use it in net/ipv6/addrconf.c, using hash_32() as well.
    As a cleanup, use it in net/ipv4/tcp_metrics.c
    Signed-off-by: default avatarEric Dumazet <>
    Reported-by: default avatarAndrew McGregor <>
    Cc: Dave Taht <>
    Cc: Tom Herbert <>
    Cc: David Laight <David.Laight@ACULAB.COM>
    Cc: Joe Perches <>
    Signed-off-by: default avatarDavid S. Miller <>