netdev - Re: [PATCH net-next] net/core: ensure features get disabled on new lower devs

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Message-ID: <20151103215310.GA7839@unicorn.suse.cz>
Date:	Tue, 3 Nov 2015 22:53:10 +0100
From:	Michal Kubecek <mkubecek@...e.cz>
To:	Jarod Wilson <jarod@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jay Vosburgh <j.vosburgh@...il.com>,
	Veaceslav Falico <vfalico@...il.com>,
	Andy Gospodarek <gospo@...ulusnetworks.com>,
	Jiri Pirko <jiri@...nulli.us>,
	Nikolay Aleksandrov <razor@...ckwall.org>,
	Alexander Duyck <alexander.duyck@...il.com>,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net/core: ensure features get disabled on new
 lower devs

On Tue, Nov 03, 2015 at 03:36:57PM -0500, Jarod Wilson wrote:
> With moving netdev_sync_lower_features() after the .ndo_set_features
> calls, I neglected to verify that devices added *after* a flag had been
> disabled on an upper device were properly added with that flag disabled as
> well. This currently happens, because we exit __netdev_update_features()
> when we see dev->features == features for the upper dev. We can retain the
> optimization of leaving without calling .ndo_set_features with a bit of
> tweaking and a goto here.

I haven't reviewed the patch yet (I'm going to take a look with fresher
mind in the morning) but if you are going to handle this in a generic
way, you may want to remove the LRO specific hacks added to
bond_enslave() and team_port_add() by commit fbe168ba91f7 ("net: generic
dev_disable_lro() stacked device handling").

                                                          Michal Kubecek

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