linux-kernel - Re: [RFC 2/2] xen-netback: disable multicast and use a random hw MAC address

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Message-ID: <CAB=NE6Wfy-+Z4-NksF9qspz3+6Cq9JNYFvzQ9i1=YoCe0KWpbQ@mail.gmail.com>
Date:	Wed, 12 Feb 2014 11:52:00 -0800
From:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
To:	Bill Fink <billfink@...dspring.com>
Cc:	Ian Campbell <Ian.Campbell@...rix.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	xen-devel@...ts.xenproject.org,
	Paul Durrant <Paul.Durrant@...rix.com>,
	Wei Liu <wei.liu2@...rix.com>, kvm@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 2/2] xen-netback: disable multicast and use a random hw MAC address

On Wed, Feb 12, 2014 at 9:17 AM, Bill Fink <billfink@...dspring.com> wrote:
> On Wed, 12 Feb 2014, Ian Campbell wrote:
>> IOW -- enabling/disabling multicast seems to me to be an odd proxy for
>> disabling SLAAC or DAD and AIUI your patch fixes the opposite case,
>> which is to avoid SLAAC and DAD on interfaces which don't do multicast
>> (which makes sense since those protocols involve multicast).
>
> Forgive me if this doesn't make sense in this context since
> I'm not a kernel developer, but I was just wondering if any of
> the sysctls:
>
>         /proc/sys/net/ipv6/conf/<ifc>/disable_ipv6
>         /proc/sys/net/ipv6/conf/<ifc>/accept_dad
>         /proc/sys/net/ipv6/conf/<ifc>/accept_ra
>         /proc/sys/net/ipv6/conf/<ifc>/autoconf
>
> would be apropos for the requirement being discussed.

These are run time configuration options, post initialization. What
we're considering is internal net_device capability fields, to even
avoid creating these in the first place.

  Luis
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