netdev - Re: [PATCH net] bonding: fix arp monitoring with vlan slaves

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Date:	Fri, 02 Aug 2013 16:17:46 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	nikolay@...hat.com, netdev@...r.kernel.org, andy@...yhouse.net,
	fubar@...ibm.com
Subject: Re: [PATCH net] bonding: fix arp monitoring with vlan slaves

On Fri, 2013-08-02 at 15:32 -0700, David Miller wrote:

> Handling this specially in bonding isn't really ideal.
> 
> Please either hide this detail in dev_trans_start(), or (preferrably)
> have vlan_dev_hard_start_xmit() set the trans_start timestamp
> properly thus making this just work for everything.

vlan is LLTX, so setting the timestamp would incur false sharing on
multiqueue.

But it's true we need a helper, because many callers do

if (dev->priv_flags & IFF_802_1Q_VLAN)
       dev = vlan_dev_real_dev(dev);

or the slighly better

if (is_vlan_dev(dev))
   dev = vlan_dev_real_dev(dev);



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