Re: [Xen-devel] [3.15-rc3] Bisected: xen-netback mangles packets between two guests on a bridge since merge of "TX grant mapping with SKBTX_DEV_ZEROCOPY instead of copy" series.

[Neal Cardwell <ncardwell@xxxxxxxxxx>]

On Fri, May 2, 2014 at 11:35 AM, Eric Dumazet <eric.dumazet@xxxxxxxxx> wrote:
> On Thu, 2014-05-01 at 17:40 +0200, Sander Eikelenboom wrote:
>
>> Yesterday i tried to get packetdrill 
>> (https://code.google.com/p/packetdrill/) to
>> work to see if i could reproduce with one of it's tests, but didn't get the
>> client server stuff working. It seems it has helped with finding and fixing
>> previous kernel networking bugs.
>
> If you use recent net-next kernel, you need a packetdrill patch, Neal
> might submit it shortly on packetdrill repo.
>
> packetdrill currently does not consume the packets sent on the tun
> device, so this triggers the new [1] TCP stack behavior detecting packet
> did not yet leaved the host.
>
> [1] :
> ( 
> http://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=1f3279ae0c13cd742731726b0ed195d5f09b14e4
>  )

I have submitted the fix to the packetdrill repo. If you "git pull"
the latest packetdrill sources then its "local mode" should work again
for net-next. Sorry if the delay has caused any hassles.

neal

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