netdev - Re: [3.15-rc3] Bisected: xen-netback mangles packets between two guests on a bridge since merge of "TX grant mapping with SKBTX_DEV

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Date:	Tue, 6 May 2014 19:37:23 +0200
From:	Sander Eikelenboom <linux@...elenboom.it>
To:	Zoltan Kiss <zoltan.kiss@...rix.com>
CC:	Steven Haigh <netwiz@....id.au>, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	<xen-devel@...ts.xen.org>
Subject: Re: [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.


Tuesday, May 6, 2014, 7:13:44 PM, you wrote:

> On 06/05/14 18:07, Steven Haigh wrote:
>> On a related note, I'm seeing this on an Arch Linux DomU and kernel
>> 3.14.2. Its running aria2c bit torrent client.
>>
>> The Dom0 is EL6 with Xen 4.2.4 / 3.14.2 kernel.
>>
>> I also lodged this on the Arch bug tracker:
>>       https://bugs.archlinux.org/task/40244
>>
>> In a nutshell, I see:
>> [ 7432.398096] xen_netfront: xennet: skb rides the rocket: 19 slots
>> [ 7434.270870] xen_netfront: xennet: skb rides the rocket: 19 slots
>> [ 7434.782199] xen_netfront: xennet: skb rides the rocket: 19 slots
>> [ 7435.184794] xen_netfront: xennet: skb rides the rocket: 19 slots
>> [ 7437.530677] xen_netfront: xennet: skb rides the rocket: 19 slots
>> [ 7437.973905] xen_netfront: xennet: skb rides the rocket: 19 slots
>> [ 7438.383947] xen_netfront: xennet: skb rides the rocket: 19 slots

> Can you also see packet corruption? You can find a testfile generator in 
> Sander's mail, downloading from an Apache server with wget seems to be OK.

The corruption shouldn't be there since he is running 3.14.2 which is fine.

And note that the corruption with 3.15 only seems to occur in traffic between 
guests  and not between dom0 and guest. The bit torrent traffic is probably 
inet <-> dom0 <-> guest, so shouldn't be affected, even with 3.15.

--
Sander


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