From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [RFC v2 2/4] net: enables interface option to skip
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Date: Tue, 18 Feb 2014 13:42:57 -0800
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To: "Luis R. Rodriguez" <mcgrof@do-not-panic.com>
Cc: kvm@vger.kernel.org, Patrick McHardy <kaber@trash.net>, Dan Williams <dcbw@redhat.com>, "netdev@vger.kernel.org" <netdev@vger.kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, James Morris <jmorris@namei.org>, Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>, Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>, xen-devel@lists.xenproject.org, "David S. Miller" <davem@davemloft.net>
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On Tue, 18 Feb 2014 13:19:15 -0800
"Luis R. Rodriguez" <mcgrof@do-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.