From: Lance Richardson <lrich...@redhat.com>
Date: Wed, 2 Nov 2016 16:36:17 -0400
> Some configurations (e.g. geneve interface with default
> MTU of 1500 over an ethernet interface with 1500 MTU) result
> in the transmission of packets that exceed the configured MTU.
> While this should be considered to be a "bad" configuration,
> it is still allowed and should not result in the sending
> of packets that exceed the configured MTU.
>
> Fix by dropping the assumption in ip_finish_output_gso() that
> locally originated gso packets will never need fragmentation.
> Basic testing using iperf (observing CPU usage and bandwidth)
> have shown no measurable performance impact for traffic not
> requiring fragmentation.
>
> Fixes: c7ba65d7b649 ("net: ip: push gso skb forwarding handling down the
> stack")
> Reported-by: Jan Tluka <jtl...@redhat.com>
> Signed-off-by: Lance Richardson <lrich...@redhat.com>
Applied and queued up for -stable.
