netdev - Re: Bug#565404: linux-image-2.6.26-2-amd64: atl1e: TSO is broken

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Date:	Sun, 31 Mar 2013 03:10:05 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	"Huang, Xiong" <xiong@....qualcomm.com>
Cc:	Anders Boström <anders@...insight.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"565404@...s.debian.org" <565404@...s.debian.org>,
	"Hannes Frederic Sowa (hannes@...essinduktion.org)" 
	<hannes@...essinduktion.org>
Subject: Re: Bug#565404: linux-image-2.6.26-2-amd64: atl1e: TSO is broken

On Sun, 2013-03-31 at 02:18 +0000, Huang, Xiong wrote:
> > > >
> > > > I've tested with
> > > > Debian linux-image-2.6.26-2-amd64 version 2.6.26-19lenny2, Debian
> > > > linux-image-2.6.30-bpo.2-amd64 version 2.6.30-8~bpo50+2 and
> > > > kernel.org
> > > > 2.6.30.10 amd64 with ethtool patch for setting of tso. Same result.
> > >
> > > Does booting with the kernel parameter 'pci=nomsi' avoid the problem?
> > >
> > 
> > Hannes has found DMA-write (for rx-packet)  is abnormal due to msi function.
> > But TSO is for rx-packet, an opposite direction. I'm not sure :(, If someone
> > has this issue,  he/she could have a try.
> > 
> 
> I checked windows driver, it does limit  the max packet length for TSO
> windows XP : 32*1024 bytes (include MAC header and all MAC payload). No support IP/TCP option.
> Windows 7:  15, 000 bytes, support IP/TCP option.

If TSO on these devices don't work properly with TCP options then you're
just going to have to disable it - Linux requires it to support at least
the timestamp option.  I'm not sure about IP options (this really ought
to be documented).

If there's a length limit lower than 64K, you'll need to set the limit
using netif_set_gso_max_size() before registering the net device.

Ben.

-- 
Ben Hutchings
Teamwork is essential - it allows you to blame someone else.

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