netdev - Re: [PATCH] bridge: mask forwarding of IEEE 802 local multicast groups

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Date:	Wed, 31 Aug 2011 21:41:26 +0100
From:	Nick Carter <ncarter100@...il.com>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	David Lamparter <equinox@...c24.net>, eswierk@...switch.com
Cc:	netdev@...r.kernel.org,
	Michał Mirosław <mirqus@...il.com>,
	davem@...emloft.net
Subject: Re: [PATCH] bridge: mask forwarding of IEEE 802 local multicast groups

On 15 August 2011 19:25, Stephen Hemminger
<shemminger@...ux-foundation.org> wrote:
> On Mon, 15 Aug 2011 17:27:12 +0100
> Nick Carter <ncarter100@...il.com> wrote:
>
>> On 28 July 2011 16:41, Stephen Hemminger
>> <shemminger@...ux-foundation.org> wrote:
>> > On Wed, 27 Jul 2011 13:17:15 +0200
>> > David Lamparter <equinox@...c24.net> wrote:
>> >
>> >> On Fri, Jul 15, 2011 at 06:33:45PM +0200, David Lamparter wrote:
>> >> > On Fri, Jul 15, 2011 at 06:03:57PM +0200, David Lamparter wrote:
>> >> > > On Fri, Jul 15, 2011 at 04:44:50PM +0100, Nick Carter wrote:
>> >> > > > On 12 July 2011 12:36, David Lamparter <equinox@...c24.net> wrote:
>> >> > > > > On Mon, Jul 11, 2011 at 08:27:55AM -0700, Stephen Hemminger wrote:
>> >> > > > >> I am still undecided on this. Understand the need, but don't like idea
>> >> > > > >> of bridge behaving in non-conforming manner. Will see if IEEE 802 committee
>> >> > > > >> has any input.
>> >> > > > >
>> >> > > > > The patch doesn't make the bridge behave nonconformant. The default mask
>> >> > > > > is 0, which just keeps the old behaviour.
>> >> >
>> >> > P.S.: I'd like to once more stress this. In my opinion the patch should
>> >> > be merged because it provides desireable functionality at a small cost
>> >> > (one test, one knob) and __does not change any default behaviour__.
>> >>
>> >> Stephen, anything new on this?
>> >
>> > No.
>> > Don't like adding yet another hack user visible API which will have
>> > to be maintained for too long. But on the other hand I don't have
>> > a better solution at my finger tips. If better idea doesn't come
>> > along, then we can go with yours.
>> >
>> I have not noticed any other proposals and this thread has been open
>> for quite a while.  Have we waited long enough ? If so can this patch
>> be taken ?
>>
>
> I am testing an alternative. The problem with your proposal is that
> it relies on the multicast address. It turns out there are people using
> other addresses for the STP group address, so using that as a identifier
> is incorrect.
If the chosen STP group address is in the local multicast group range
this patch will handle it.

David Lamparter has reviewed this patch and asked for it to be merged.
 This patch has at least two real world uses.  Ed needs this patch to
forward LLDP frames and I need this patch to forward 802.1X frames.

This patch has been out for review for 9 weeks and it still looks like
the best solution.

Could this patch be merged please ?

Thanks,
Nick
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