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tcp: md5: add tcp_md5_needed jump label

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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>
This commit is contained in:
Eric Dumazet 2018-11-27 15:03:21 -08:00 • committed by David S. Miller
parent 2f69555315
commit 6015c71e65
4 changed files with 30 additions and 10 deletions
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11
net/ipv4/tcp_ipv4.c
View file

@ -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;
EXPORT_SYMBOL(tcp_md5_needed);
/* 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;
}
EXPORT_SYMBOL(tcp_md5_do_lookup);
EXPORT_SYMBOL(__tcp_md5_do_lookup);
static struct tcp_md5sig_key *tcp_md5_do_lookup_exact(const struct sock *sk,
const union tcp_md5_addr *addr,