netdev - Re: [net] net_sched: make dev_trans_start return vlan's real dev trans

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Date:	Sat, 03 Aug 2013 20:19:10 +0200
From:	Nikolay Aleksandrov <nikolay@...hat.com>
To:	Veaceslav Falico <vfalico@...hat.com>
CC:	netdev@...r.kernel.org, davem@...emloft.net, fubar@...ibm.com,
	jhs@...atatu.com
Subject: Re: [net] net_sched: make dev_trans_start return vlan's real dev
 trans_start

On 08/03/2013 08:13 PM, Nikolay Aleksandrov wrote:
> On 08/03/2013 07:07 PM, Veaceslav Falico wrote:
>> On Sat, Aug 03, 2013 at 05:07:51PM +0200, nikolay@...hat.com wrote:
>> ...snip...
>>> +    while (is_vlan_dev(dev))
>>> +        dev = vlan_dev_real_dev(dev);
>>
>> While at it - I've checked a few users (mainly network drivers) of
>> vlan_dev_real_dev(dev) and they all rely on that the return device would be
>> the *real* device, but not another vlan.
>>
>> So maybe we should move this while loop to vlan_dev_real_dev() instead?
<snip>
> Not really, there're users that rely to get only 1 level of real_dev (e.g.
> netxen ip config which expects a configuration like vlan -> bond -> netxen,
> and it needs to go from vlan to bond only) which will be broken, there're
Scratch this part, I need to get some sleep :-)


> also many non-ethernet users which may rely on similar behaviour.
> Most of the network drivers don't expect a *real* device, they check if the
> returned device is one of their own after using that function.
> I'd suggest using a helper that uses vlan_dev_real_dev so we will have both
> without breaking anything.
> 
> Nik
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