netdev - Re: [PATCH net] tcp: inherit timestamp on mtu probe

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Message-Id: <20190828.155701.124973288104934003.davem@davemloft.net>
Date:   Wed, 28 Aug 2019 15:57:01 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     willemdebruijn.kernel@...il.com
Cc:     netdev@...r.kernel.org, edumazet@...gle.com,
        jakub.kicinski@...ronome.com, willemb@...gle.com
Subject: Re: [PATCH net] tcp: inherit timestamp on mtu probe

From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
Date: Tue, 27 Aug 2019 15:09:33 -0400

> From: Willem de Bruijn <willemb@...gle.com>
> 
> TCP associates tx timestamp requests with a byte in the bytestream.
> If merging skbs in tcp_mtu_probe, migrate the tstamp request.
> 
> Similar to MSG_EOR, do not allow moving a timestamp from any segment
> in the probe but the last. This to avoid merging multiple timestamps.
> 
> Tested with the packetdrill script at
> https://github.com/wdebruij/packetdrill/commits/mtu_probe-1
> 
> Link: http://patchwork.ozlabs.org/patch/1143278/#2232897
> Fixes: 4ed2d765dfac ("net-timestamp: TCP timestamping")
> Signed-off-by: Willem de Bruijn <willemb@...gle.com>

Applied and queued up for -stable.