netdev - RE: PROBLEM: Bnx2x Checksum/Length Error Over GRE Tunnel

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Message-ID: <B5657A6538887040AD3A81F1008BEC63BE78AC@avmb3.qlogic.org>
Date:	Thu, 5 Feb 2015 16:13:36 +0000
From:	Yuval Mintz <Yuval.Mintz@...gic.com>
To:	Eren Türkay <erent@...atlas.com>
CC:	netdev <netdev@...r.kernel.org>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: RE: PROBLEM: Bnx2x Checksum/Length Error Over GRE Tunnel

> I am not sure if tx offloading will affect the VM performance. Regardless of OVS
> problem, there seems to be a bug with segmentation offloading as it's only
> possible to use the interface with "tx off". I have compiled the kernel with
> debugging on and I can enable debugging on related parts in the kernel for
> further information.
> 
> > Here I easily reach line rate with a single flow.
> >
> > ip tunnel add gre1 mode gre remote 10.246.11.52 local 10.246.11.51 ip
> > link set gre1 up ip addr add 7.7.8.51/24 dev gre1
> 
> ip tunnel add gre1 mode gre remote 10.20.0.162 local 10.20.0.161 ip l set gre1
> up ip addr add 7.7.8.161/24 dev gre1

Tried this on latest net-next [using iproute2] and I didn't manage to hit the
issue you've indicated.
I.e., traffic seemed to work fine on gre tunnels using both mtu sizes and
regardless of whether Tx-checksum-offload was enabled or disabled.

Is there anything else which is worth mentioning in your setup?

Thanks,
Yuval