[PATCH 4.19 09/42] tcp: Fix SOF_TIMESTAMPING_RX_HARDWARE to use the latest timestamp during TCP coalescing

[Greg Kroah-Hartman]

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stephen Mallon <stephen.mal...@sydney.edu.au>

[ Upstream commit cadf9df27e7cf40e390e060a1c71bb86ecde798b ]

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.mal...@sydney.edu.au>
Signed-off-by: Eric Dumazet <eduma...@google.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/ipv4/tcp_input.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4371,6 +4371,7 @@ static bool tcp_try_coalesce(struct sock
        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;