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| 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 /include/net/tcp.h | |
| 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 'include/net/tcp.h')
| -rw-r--r-- | include/net/tcp.h | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 3b522259da7d..0681afc62354 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -1555,9 +1555,21 @@ struct tcp_md5sig_key *tcp_v4_md5_lookup(const struct sock *sk, const struct sock *addr_sk); #ifdef CONFIG_TCP_MD5SIG -struct tcp_md5sig_key *tcp_md5_do_lookup(const struct sock *sk, - const union tcp_md5_addr *addr, - int family); +#include <linux/jump_label.h> +extern struct static_key tcp_md5_needed; +struct tcp_md5sig_key *__tcp_md5_do_lookup(const struct sock *sk, + const union tcp_md5_addr *addr, + int family); +static inline struct tcp_md5sig_key * +tcp_md5_do_lookup(const struct sock *sk, + const union tcp_md5_addr *addr, + int family) +{ + if (!static_key_false(&tcp_md5_needed)) + return NULL; + return __tcp_md5_do_lookup(sk, addr, family); +} + #define tcp_twsk_md5_key(twsk) ((twsk)->tw_md5_key) #else static inline struct tcp_md5sig_key *tcp_md5_do_lookup(const struct sock *sk, |