netdev - Re: Atheros Communications Inc. AR8121/AR8113/AR8114 Gigabit or Fast Ethernet (rev b0) 1.0.0.7 md5/sha1 corrupted using NFS and samba (updated) Version 2

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Date:	Sun, 24 Mar 2013 06:23:00 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	"Huang, Xiong" <xiong@....qualcomm.com>
Cc:	Sven Hartge <sven@...nhartge.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Atheros Communications Inc. AR8121/AR8113/AR8114 Gigabit or Fast Ethernet (rev b0) 1.0.0.7 md5/sha1 corrupted using NFS and samba (updated) Version 2

On Sun, Mar 24, 2013 at 05:16:03AM +0000, Huang, Xiong wrote:
> > > >
> > > > Btw the captured corrupted packets are ordinary non-fragmented TCP
> > > > IPv4 packets. But perhaps these flags are dual-use?
> > > >
> > > Not dual-use.  You could check  flags for corrupted packets and compare it
> > with good packet.
> > > Your corrupted packet is just TCP checksum error ?
> > 
> > I'll try it.
> > 
> > The caputered packets show that a 16 byte segment overwrites later data in
> > the same packet, sometimes even multiple contiguous 16 byte segments.
> > 
> > The corrupted packets look like this:
> > 
> > ...ABC....DBBEF..
> > 
> > Each character represents a 16 byte region, the dots are dont-care
> > placeholders. The BB-region is overwritten by the data of the first B-region.
> > 
> 
> It looks like a DMA issue. Not checksum related. :(

Yes, I think so, too. Until this is resolved I would propose to not set
CHECKSUM_UNNECESSARY because it could corrupt data (like for the original
poster).

Do you have any idea where how these errors could be resolved? I e.g. could
not reproduce it with FreeBSD and the driver seems to be related to the linux
driver.

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