netdev - RE: [PATCH v2 net 2/2] tg3: Fix data corruption on 5725 with TSO

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Message-ID: <1368633080.3768.17.camel@LTIRV-MCHAN1.corp.ad.broadcom.com>
Date:	Wed, 15 May 2013 08:51:20 -0700
From:	"Michael Chan" <mchan@...adcom.com>
To:	"Eric Dumazet" <eric.dumazet@...il.com>
cc:	"David Laight" <David.Laight@...LAB.COM>,
	"Nithin Nayak Sujir" <nsujir@...adcom.com>, davem@...emloft.net,
	netdev@...r.kernel.org, stable@...r.kernel.org
Subject: RE: [PATCH v2 net 2/2] tg3: Fix data corruption on 5725 with
 TSO

On Wed, 2013-05-15 at 08:23 -0700, Eric Dumazet wrote: 
> On Wed, 2013-05-15 at 08:12 -0700, Michael Chan wrote:
> 
> > 
> > We will discard the packet if that happens.  I think the probabilty is
> > very small.
> 
> Data corruption means the content of the packet was mangled on the wire,
> or was it a more serious issue, like a tx queue hang ?
> 
> 
I think the DMA engine is getting the wrong data under this condition so
we end up with bad data but correct header checksums on the wire.



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