netdev - Re: [patch net-next 01/15] net: introduce upper device lists

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Date:	Sun, 30 Dec 2012 20:56:33 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
	bhutchings@...arflare.com, faisal.latif@...el.com, fbl@...hat.com,
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	fubar@...ibm.com, andy@...yhouse.net, divy@...lsio.com,
	jitendra.kalsaria@...gic.com, sony.chacko@...gic.com,
	linux-driver@...gic.com, kaber@...sh.net, ursula.braun@...ibm.com,
	blaschka@...ux.vnet.ibm.com, schwidefsky@...ibm.com,
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	amwang@...hat.com, nhorman@...driver.com,
	john.r.fastabend@...el.com, pablo@...filter.org
Subject: Re: [patch net-next 01/15] net: introduce upper device lists

On Sun, 30 Dec 2012 12:58:08 +0100
Jiri Pirko <jiri@...nulli.us> wrote:

> This lists are supposed to serve for storing pointers to all upper devices.
> Eventually it will replace dev->master pointer which is used for
> bonding, bridge, team but it cannot be used for vlan, macvlan where
> there might be multiple upper present. In case the upper link is
> replacement for dev->master, it is marked with "master" flag.
> 
> New upper device list resolves this limitation. Also, the information
> stored in lists is used for preventing looping setups like
> "bond->somethingelse->samebond"
> 
> Signed-off-by: Jiri Pirko <jiri@...nulli.us>

What is the use case for this?
Could you describe a topology that the new upper device list supports,
that the old scheme does not?

I am concerned that it may open up many new possibilities for user
error that were not possible before. For example how does it prevent
an ethernet from being assigned to both a bonding and bridge at the
same time?
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