diff options
| author |   Eric Dumazet <edumazet@google.com> | 2018-11-27 15:03:21 -0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-11-30 13:28:03 -0800 |
| commit | 6015c71e656bb6895b416c31a8b7db457e45cecf (patch) | |
| tree | ba31e8ae21f52048e475daa33f6bb86df5bfc3b5 /net/ipv4/tcp.c | |
| parent | Merge branch 'tcp-take-a-bit-more-care-of-backlog-stress' (diff) | |
| download | linux-dev-6015c71e656bb6895b416c31a8b7db457e45cecf.tar.xz linux-dev-6015c71e656bb6895b416c31a8b7db457e45cecf.zip | |
tcp: md5: add tcp_md5_needed jump label
Most linux hosts never setup TCP MD5 keys. We can avoid a
cache line miss (accessing tp->md5ig_info) on RX and TX
using a jump label.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp.c')
| -rw-r--r-- | net/ipv4/tcp.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 252048776dbb..215e4d3b3616 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -3656,8 +3656,11 @@ bool tcp_alloc_md5sig_pool(void) if (unlikely(!tcp_md5sig_pool_populated)) { mutex_lock(&tcp_md5sig_mutex); - if (!tcp_md5sig_pool_populated) + if (!tcp_md5sig_pool_populated) { __tcp_alloc_md5sig_pool(); + if (tcp_md5sig_pool_populated) + static_key_slow_inc(&tcp_md5_needed); + } mutex_unlock(&tcp_md5sig_mutex); } |