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

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Date:	Sat, 03 Aug 2013 11:52:28 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	vfalico@...hat.com
Cc:	nikolay@...hat.com, netdev@...r.kernel.org, fubar@...ibm.com,
	jhs@...atatu.com
Subject: Re: [net] net_sched: make dev_trans_start return vlan's real dev
 trans_start

From: Veaceslav Falico <vfalico@...hat.com>
Date: Sat, 3 Aug 2013 19:07:33 +0200

> 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.

Did you find any cases that want the device under the VLAN,
whether it is a non-vlan device or not?

> So maybe we should move this while loop to vlan_dev_real_dev()
> instead?

Perhaps.  As per above, we may also need the one-level demux
helper too, something like "vlan_dev_slave(dev)".
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