netdev - Re: [net-next,1/3] bonding: fix vlan 0 addition and removal

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Date:	Tue, 06 Aug 2013 11:01:31 +0200
From:	Nikolay Aleksandrov <nikolay@...hat.com>
To:	Veaceslav Falico <vfalico@...hat.com>
CC:	netdev@...r.kernel.org, fubar@...ibm.com, andy@...yhouse.net,
	davem@...emloft.net, kaber@...sh.net
Subject: Re: [net-next,1/3] bonding: fix vlan 0 addition and removal

On 08/06/2013 10:51 AM, Veaceslav Falico wrote:
> On Tue, Aug 06, 2013 at 10:16:04AM +0200, Nikolay Aleksandrov wrote:
>> On 08/05/2013 11:51 PM, Veaceslav Falico wrote:
>>> On Mon, Aug 05, 2013 at 03:28:22PM +0200, nikolay@...hat.com wrote:
>>> ...snip...
>>>> This is fixed by forbidding the addition/removal of vlan 0 through the
>>>> bond's ndo_vlan_rx_add/kill_vid functions, and adding/removing it only
>>>> when
>>>> vlan 0 is in fact being created (or destroyed) on top of a bond interface
>>>> in the bond's netdev handling function.
>>>
>>> Isn't that a bit too intrusive/hacky? I don't think we should treat vlan id
>>> 0 somehow differently in terms of adding/removing, though I might be
>>> wrong...
>>>
>> I didn't want to touch the vlan code, so I solved the problem entirely in
>> the bonding, mind you there's still a bug when loading the 8021q module
>> we'll bump up every slave's vlan 0 refcnt without adding the vlan, and it
>> won't get bumped down.
>> In my patch that problem still persists but only when an actual vlan 0 is
>> being created.
> 
> I'll look into that, though maybe we'll require another patch to fix it.
> 
You can take a look at:
http://www.spinics.net/lists/netdev/msg241858.html#.UgC5rxoW2Y4
and
http://www.spinics.net/lists/netdev/msg241999.html#.UgC5_BoW2Y4

I think I've explained the refcnt bug well there.


Thanks,
 Nik

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