linux-kernel - Re: [patch net-next 01/16] net: introduce upper device lists

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Date:	Tue, 14 Aug 2012 10:14:00 -0300
From:	Flavio Leitner <fbl@...hat.com>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
	faisal.latif@...el.com, roland@...nel.org, sean.hefty@...el.com,
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	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,
	linux390@...ibm.com, shemminger@...tta.com,
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	xiyou.wangcong@...il.com, joe@...ches.com,
	gregory.v.rose@...el.com, john.r.fastabend@...el.com,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-s390@...r.kernel.org, bridge@...ts.linux-foundation.org
Subject: Re: [patch net-next 01/16] net: introduce upper device lists

On Tue, 14 Aug 2012 14:24:33 +0200
Jiri Pirko <jiri@...nulli.us> wrote:

> Mon, Aug 13, 2012 at 07:52:17PM CEST, fbl@...hat.com wrote:
> >On Mon, 13 Aug 2012 17:27:00 +0200
> >Jiri Pirko <jiri@...nulli.us> wrote:
> >> +	/*
> >> +	 * To prevent loops, check if dev is not upper device to upper_dev.
> >> +	 */
> >> +	if (__netdev_has_upper_dev(upper_dev, dev, true))
> >> +		return -EBUSY;
> >> +
> >> +	if (__netdev_find_upper(dev, upper_dev))
> >> +		return -EEXIST;
> >
> >__netdev_has_upper_dev() can go all the way up finding the device and
> >the __netdev_find_upper() just check the first level.
> 
> 
> I do not think this ordering is somewhat inportant.

it's not the order, see below:

> >I think it would be better to use:
> >__netdev_find_upper_dev(,,deep=true/false)
> >__netdev_has_upper(,)

It's their names.  Currently, the function ..._find_... look at
one level only, while the function ..._has_... does one or more
levels.  I think it's better to swap 'has' and 'find' in their names:

__netdev_find_upper_dev(,,deep=true/false) <-- find in all levels
__netdev_has_upper(,)  <-- check only the one level.

fbl
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