From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: [bisected] xfrm: TCP connection initiating PMTU discovery
 stalls on v3.
Date: Fri, 12 Dec 2014 16:15:40 -0800
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Cc: Thomas Jarosch <thomas.jarosch@intra2net.com>,
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To: Wolfgang Walter <linux@stwm.de>
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On Sat, 2014-12-13 at 00:47 +0100, Wolfgang Walter wrote:

> I can't disable it as the driver will not allow it:
> # ethtool -K eth0 tx off
> Cannot change tx-checksumming
> Could not change any device features

Sounds a bug in itself :(