path: root/net/ipv4/tcp_ipv4.c
diff options
authorEric Dumazet <edumazet@google.com>2018-11-27 15:03:21 -0800
committerDavid S. Miller <davem@davemloft.net>2018-11-30 13:28:03 -0800
commit6015c71e656bb6895b416c31a8b7db457e45cecf (patch)
treeba31e8ae21f52048e475daa33f6bb86df5bfc3b5 /net/ipv4/tcp_ipv4.c
parentMerge branch 'tcp-take-a-bit-more-care-of-backlog-stress' (diff)
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_ipv4.c')
1 files changed, 7 insertions, 4 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 4904250a9aac..efc6fef692ff 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -970,10 +970,13 @@ static void tcp_v4_reqsk_destructor(struct request_sock *req)
* We need to maintain these in the sk structure.
+struct static_key tcp_md5_needed __read_mostly;
/* Find the Key structure for an address. */
-struct tcp_md5sig_key *tcp_md5_do_lookup(const struct sock *sk,
- const union tcp_md5_addr *addr,
- int family)
+struct tcp_md5sig_key *__tcp_md5_do_lookup(const struct sock *sk,
+ const union tcp_md5_addr *addr,
+ int family)
const struct tcp_sock *tp = tcp_sk(sk);
struct tcp_md5sig_key *key;
@@ -1011,7 +1014,7 @@ struct tcp_md5sig_key *tcp_md5_do_lookup(const struct sock *sk,
return best_match;
static struct tcp_md5sig_key *tcp_md5_do_lookup_exact(const struct sock *sk,
const union tcp_md5_addr *addr,