Eric Dumazet 71cea17ed3
tcp: md5: remove spinlock usage in fast path ...
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: Eric Dumazet <edumazet@google.com >
Cc: Herbert Xu <herbert@gondor.apana.org.au >
Signed-off-by: David S. Miller <davem@davemloft.net >
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71cea17ed3