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net/tcp_fastopen: Add snmp counter for blackhole detection

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This counter records the number of times the firewall blackhole issue is
detected and active TFO is disabled.

Signed-off-by: Wei Wang <weiwan@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wei Wang 2017-04-20 14:45:47 -07:00 • committed by David S. Miller
parent cf1ef3f071
commit 46c2fa3987
5 changed files with 8 additions and 5 deletions
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5
net/ipv4/tcp_fastopen.c
View file

@ -410,10 +410,11 @@ static unsigned long tfo_active_disable_stamp __read_mostly;
/* Disable active TFO and record current jiffies and
* tfo_active_disable_times
*/
void tcp_fastopen_active_disable(void)
void tcp_fastopen_active_disable(struct sock *sk)
{
atomic_inc(&tfo_active_disable_times);
tfo_active_disable_stamp = jiffies;
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPFASTOPENBLACKHOLE);
}
/* Reset tfo_active_disable_times to 0 */
@ -469,7 +470,7 @@ void tcp_fastopen_active_disable_ofo_check(struct sock *sk)
if (p && !rb_next(p)) {
skb = rb_entry(p, struct sk_buff, rbnode);
if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) {
tcp_fastopen_active_disable();
tcp_fastopen_active_disable(sk);
return;
}
}