linux-kernel - Re: netconsole breaks netpoll on bridge

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Message-Id: <835D3F57-EB3A-4D30-B19C-7CC987D06C55@profihost.ag>
Date:	Mon, 16 Jun 2014 21:19:34 +0200
From:	Stefan Priebe - Profihost AG <s.priebe@...fihost.ag>
To:	Cong Wang <cwang@...pensource.com>
Cc:	Stephen Hemminger <stephen@...workplumber.org>,
	David Miller <davem@...emloft.net>,
	"bridge@...ts.linux-foundation.org" 
	<bridge@...ts.linux-foundation.org>,
	Linux Netdev List <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: netconsole breaks netpoll on bridge


> Am 16.06.2014 um 21:12 schrieb Cong Wang <cwang@...pensource.com>:
> 
> On Mon, Jun 16, 2014 at 12:05 PM, Stefan Priebe - Profihost AG
> <s.priebe@...fihost.ag> wrote:
>> 
>>> Am 16.06.2014 um 20:51 schrieb Cong Wang <cwang@...pensource.com>:
>>> 
>>> On Mon, Jun 16, 2014 at 11:41 AM, Stefan Priebe - Profihost AG
>>> <s.priebe@...fihost.ag> wrote:
>>>> 
>>>>> Am 16.06.2014 um 20:05 schrieb Cong Wang <cwang@...pensource.com>:
>>>>> 
>>>>> On Mon, Jun 16, 2014 at 5:51 AM, Stefan Priebe - Profihost AG
>>>>> <s.priebe@...fihost.ag> wrote:
>>>>>> Hi,
>>>>>> 
>>>>>> i'm using a vanilla 3.10.43 kernel and netconsole on top of a bridge.
>>>>>> 
>>>>>> netconsole is used with vmbr0 (bridge) which is on top of bond0.
>>>>>> 
>>>>>> If i want to add another bridge to vmbr0 is fails as long as netconsole
>>>>>> is in use.
>>>>>> 
>>>>>> # brctl addif vmbr0 fwpr2004p0
>>>>>> can't add fwpr2004p0 to bridge vmbr0: Unknown error 524
>>>>>> 
>>>>>> Kernel output:
>>>>>> netpoll: (null): fwpr2004p0 doesn't support polling, aborting
>>>>>> 
>>>>>> If i do rmmod netconsole - everything is working fine again.
>>>>> 
>>>>> This is expected, you can't add an interface which doesn't support
>>>>> netpoll to a bridge which is running netpoll.
>>>> 
>>>> Thanks, so i can't use netconsole at a bridge used for vms?
>>> 
>>> You can, but you need to make sure all the devices under
>>> this bridge support netpoll. Not considering mac learning,
>>> bridge just broadcasts all the packets to its ports, if one of them
>>> doesn't support netpoll, how could it work?
>> 
>> Ok i was trying to add a veth device so this is the problematic device.
> 
> We can just add netpoll support to veth device, it should not be hard.
> I will work on it once net-next is open.

That sounds great! Is there anything I can do or some code I can port to veth?

Greets,
Stefan
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