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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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3
net/ipv4/tcp_timer.c
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@@ -339,7 +339,7 @@ static void tcp_probe_timer(struct sock *sk)
*/
start_ts = tcp_skb_timestamp(tcp_send_head(sk));
if (!start_ts)
skb_mstamp_get(&tcp_send_head(sk)->skb_mstamp);
tcp_send_head(sk)->skb_mstamp = tp->tcp_mstamp;
else if (icsk->icsk_user_timeout &&
(s32)(tcp_time_stamp - start_ts) > icsk->icsk_user_timeout)
goto abort;
@@ -561,6 +561,7 @@ void tcp_write_timer_handler(struct sock *sk)
goto out;
}
skb_mstamp_get(&tcp_sk(sk)->tcp_mstamp);
event = icsk->icsk_pending;
switch (event) {