tcp: consolidate SYNACK RTT sampling

The first patch consolidates SYNACK and other RTT measurement to use a
central function tcp_ack_update_rtt(). A (small) bonus is now SYNACK
RTT measurement happens after PAWS check, potentially reducing the
impact of RTO seeding on bad TCP timestamps values.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 0 insertions, 9 deletions

diff --git a/include/net/tcp.h b/include/net/tcp.h
index d1980054ec75..f9777dbede75 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1094,15 +1094,6 @@ static inline void tcp_openreq_init(struct request_sock *req,
         ireq->loc_port = tcp_hdr(skb)->dest;
 }
 
-/* Compute time elapsed between SYNACK and the ACK completing 3WHS */
-static inline void tcp_synack_rtt_meas(struct sock *sk,
-                                       struct request_sock *req)
-{
-        if (tcp_rsk(req)->snt_synack)
-                tcp_valid_rtt_meas(sk,
-                    tcp_time_stamp - tcp_rsk(req)->snt_synack);
-}
-
 extern void tcp_enter_memory_pressure(struct sock *sk);
 
 static inline int keepalive_intvl_when(const struct tcp_sock *tp)