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Date:   Fri, 26 Jun 2020 21:05:32 -0700
From:   Yousuk Seung <>
To:     David Miller <>
Cc:, Yousuk Seung <>,
        Yuchung Cheng <>,
        Eric Dumazet <>,
        Neal Cardwell <>,
        Soheil Hassas Yeganeh <>
Subject: [PATCH net-next 1/4] tcp: stamp SCM_TSTAMP_ACK later in tcp_clean_rtx_queue()

Currently tp->delivered is updated with sacked packets but not
cumulatively acked when SCP_TSTAMP_ACK is timestamped. This patch moves
a tcp_ack_tstamp() call in tcp_clean_rtx_queue() to later in the loop so
that when a skb is fully acked OPT_STATS of SCM_TSTAMP_ACK will include
the current skb in the delivered count. When not fully acked
tcp_ack_tstamp() is a no-op and there is no change in behavior.

Signed-off-by: Yousuk Seung <>
Signed-off-by: Yuchung Cheng <>
Acked-by: Eric Dumazet <>
Acked-by: Neal Cardwell <>
Acked-by: Soheil Hassas Yeganeh <>
 net/ipv4/tcp_input.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index f3a0eb139b76..2a683e785cca 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3078,8 +3078,6 @@ static int tcp_clean_rtx_queue(struct sock *sk, u32 prior_fack,
 		u8 sacked = scb->sacked;
 		u32 acked_pcount;
-		tcp_ack_tstamp(sk, skb, prior_snd_una);
 		/* Determine how many packets and what bytes were acked, tso and else */
 		if (after(scb->end_seq, tp->snd_una)) {
 			if (tcp_skb_pcount(skb) == 1 ||
@@ -3143,6 +3141,8 @@ static int tcp_clean_rtx_queue(struct sock *sk, u32 prior_fack,
 		if (!fully_acked)
+		tcp_ack_tstamp(sk, skb, prior_snd_una);
 		next = skb_rb_next(skb);
 		if (unlikely(skb == tp->retransmit_skb_hint))
 			tp->retransmit_skb_hint = NULL;

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