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

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

From: Stephen Mallon <[email protected]>

[ 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 <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
 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;


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