• Eric Dumazet's avatar
    tcp: md5: remove spinlock usage in fast path · 71cea17e
    Eric Dumazet authored
    TCP md5 code uses per cpu variables but protects access to them with
    a shared spinlock, which is a contention point.
    
    [ tcp_md5sig_pool_lock is locked twice per incoming packet ]
    
    Makes things much simpler, by allocating crypto structures once, first
    time a socket needs md5 keys, and not deallocating them as they are
    really small.
    
    Next step would be to allow crypto allocations being done in a NUMA
    aware way.
    Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
    Cc: Herbert Xu <herbert@gondor.apana.org.au>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    71cea17e
tcp.c 85.6 KB