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Commit 8c2320e8 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
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tcp: md5: only call tp->af_specific->md5_lookup() for md5 sockets



RETPOLINE made calls to tp->af_specific->md5_lookup() quite expensive,
given they have no result.
We can omit the calls for sockets that have no md5 keys.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a06ac0d6
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+14 −12
Original line number Diff line number Diff line
@@ -585,14 +585,15 @@ static unsigned int tcp_syn_options(struct sock *sk, struct sk_buff *skb,
	unsigned int remaining = MAX_TCP_OPTION_SPACE;
	struct tcp_fastopen_request *fastopen = tp->fastopen_req;

	*md5 = NULL;
#ifdef CONFIG_TCP_MD5SIG
	if (unlikely(rcu_access_pointer(tp->md5sig_info))) {
		*md5 = tp->af_specific->md5_lookup(sk, sk);
		if (*md5) {
			opts->options |= OPTION_MD5;
			remaining -= TCPOLEN_MD5SIG_ALIGNED;
		}
#else
	*md5 = NULL;
	}
#endif

	/* We always get an MSS option.  The option bytes which will be seen in
@@ -720,14 +721,15 @@ static unsigned int tcp_established_options(struct sock *sk, struct sk_buff *skb

	opts->options = 0;

	*md5 = NULL;
#ifdef CONFIG_TCP_MD5SIG
	if (unlikely(rcu_access_pointer(tp->md5sig_info))) {
		*md5 = tp->af_specific->md5_lookup(sk, sk);
	if (unlikely(*md5)) {
		if (*md5) {
			opts->options |= OPTION_MD5;
			size += TCPOLEN_MD5SIG_ALIGNED;
		}
#else
	*md5 = NULL;
	}
#endif

	if (likely(tp->rx_opt.tstamp_ok)) {