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 /include/net | |
| parent | 168fc21a971e4bc821a7838ccc39b7bdaf316c11 (diff) | |
| download | blackbird-op-linux-71cea17ed39fdf1c0634f530ddc6a2c2fc601c2b.tar.gz blackbird-op-linux-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 'include/net')
| -rw-r--r-- | include/net/tcp.h | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index e1c3723f161f..bf1cc3dced5e 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -1283,11 +1283,13 @@ static inline struct tcp_md5sig_key *tcp_md5_do_lookup(struct sock *sk, #define tcp_twsk_md5_key(twsk) NULL #endif -extern struct tcp_md5sig_pool __percpu *tcp_alloc_md5sig_pool(struct sock *); -extern void tcp_free_md5sig_pool(void); +extern bool tcp_alloc_md5sig_pool(void); extern struct tcp_md5sig_pool *tcp_get_md5sig_pool(void); -extern void tcp_put_md5sig_pool(void); +static inline void tcp_put_md5sig_pool(void) +{ + local_bh_enable(); +} extern int tcp_md5_hash_header(struct tcp_md5sig_pool *, const struct tcphdr *); extern int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *, const struct sk_buff *, |
