diff options
| author | Eric Dumazet <edumazet@google.com> | 2013-05-20 06:52:26 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-05-20 14:00:42 -0700 |
| commit | 71cea17ed39fdf1c0634f530ddc6a2c2fc601c2b (patch) | |
| tree | ec6ec3929a41948fb7fef76cceaebf2f1681f1d8 /net/ipv4/tcp_minisocks.c | |
| parent | 168fc21a971e4bc821a7838ccc39b7bdaf316c11 (diff) | |
| download | lwn-71cea17ed39fdf1c0634f530ddc6a2c2fc601c2b.tar.gz lwn-71cea17ed39fdf1c0634f530ddc6a2c2fc601c2b.zip | |
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>
Diffstat (limited to 'net/ipv4/tcp_minisocks.c')
| -rw-r--r-- | net/ipv4/tcp_minisocks.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c index 0f0178827259..ab1c08658528 100644 --- a/net/ipv4/tcp_minisocks.c +++ b/net/ipv4/tcp_minisocks.c @@ -317,7 +317,7 @@ void tcp_time_wait(struct sock *sk, int state, int timeo) key = tp->af_specific->md5_lookup(sk, sk); if (key != NULL) { tcptw->tw_md5_key = kmemdup(key, sizeof(*key), GFP_ATOMIC); - if (tcptw->tw_md5_key && tcp_alloc_md5sig_pool(sk) == NULL) + if (tcptw->tw_md5_key && !tcp_alloc_md5sig_pool()) BUG(); } } while (0); @@ -358,10 +358,8 @@ void tcp_twsk_destructor(struct sock *sk) #ifdef CONFIG_TCP_MD5SIG struct tcp_timewait_sock *twsk = tcp_twsk(sk); - if (twsk->tw_md5_key) { - tcp_free_md5sig_pool(); + if (twsk->tw_md5_key) kfree_rcu(twsk->tw_md5_key, rcu); - } #endif } EXPORT_SYMBOL_GPL(tcp_twsk_destructor); |