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tcp: use tp->tcp_mstamp in output path

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Idea is to later convert tp->tcp_mstamp to a full u64 counter
using usec resolution, so that we can later have fine
grained TCP TS clock (RFC 7323), regardless of HZ value.

We try to refresh tp->tcp_mstamp only when necessary.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2017-05-16 14:00:00 -07:00
committed by David S. Miller
parent 9d4f97f97b
commit 385e20706f
4 changed files with 14 additions and 12 deletions
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net/ipv4/tcp_recovery.c
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@@ -166,7 +166,6 @@ void tcp_rack_reo_timeout(struct sock *sk)
u32 timeout, prior_inflight;
prior_inflight = tcp_packets_in_flight(tp);
skb_mstamp_get(&tp->tcp_mstamp);
tcp_rack_detect_loss(sk, &timeout);
if (prior_inflight != tcp_packets_in_flight(tp)) {
if (inet_csk(sk)->icsk_ca_state != TCP_CA_Recovery) {