netdev - Re: [RFC v2 2/4] net: enables interface option to skip IP

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Date:	Tue, 18 Feb 2014 13:42:57 -0800
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	Dan Williams <dcbw@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	xen-devel@...ts.xenproject.org, kvm@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [RFC v2 2/4] net: enables interface option to skip IP

On Tue, 18 Feb 2014 13:19:15 -0800
"Luis R. Rodriguez" <mcgrof@...not-panic.com> wrote:

> Sure, but note that the both disable_ipv6 and accept_dada sysctl
> parameters are global. ipv4 and ipv6 interfaces are created upon
> NETDEVICE_REGISTER, which will get triggered when a driver calls
> register_netdev(). The goal of this patch was to enable an early
> optimization for drivers that have no need ever for ipv4 or ipv6
> interfaces.

The trick with ipv6 is to register the device, then have userspace
do the ipv6 sysctl before bringing the device up.
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