netdev - [PATCH net] tcp: Fix SOF_TIMESTAMPING_RX_HARDWARE to use the latest timestamp during TCP coalescing

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Message-ID: <20181120081502.GA9134@stephen-mallon>
Date:   Tue, 20 Nov 2018 19:15:02 +1100
From:   Stephen Mallon <stephen.mallon@...ney.edu.au>
To:     Eric Dumazet <edumazet@...gle.com>
CC:     "David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>,
        <stephen.mallon@...ney.edu.au>
Subject: [PATCH net] tcp: Fix SOF_TIMESTAMPING_RX_HARDWARE to use the latest
 timestamp during TCP coalescing

During tcp coalescing ensure that the skb hardware timestamp refers to the
highest sequence number data.
Previously only the software timestamp was updated during coalescing.

Signed-off-by: Stephen Mallon <stephen.mallon@...ney.edu.au>
---
 net/ipv4/tcp_input.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 2868ef28ce52..e695584bb33f 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4363,6 +4363,7 @@ static bool tcp_try_coalesce(struct sock *sk,
 	if (TCP_SKB_CB(from)->has_rxtstamp) {
 		TCP_SKB_CB(to)->has_rxtstamp = true;
 		to->tstamp = from->tstamp;
+		skb_hwtstamps(to)->hwtstamp = skb_hwtstamps(from)->hwtstamp;
 	}
 
 	return true;
-- 
2.18.1