netdev - Re: MLD maturity in kernel version 2.6.32.60

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Message-ID: <20131118221850.GO16541@order.stressinduktion.org>
Date:	Mon, 18 Nov 2013 23:18:50 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Simon Schneider <simon-schneider@....net>
Cc:	netdev@...r.kernel.org
Subject: Re: MLD maturity in kernel version 2.6.32.60

On Mon, Nov 18, 2013 at 01:17:28PM +0100, Simon Schneider wrote:
> in a development project, we started evaluating MLD functionality.
>  
> Our development is based on kernel version 2.6.32.60.
>  
> We noticed some pretty basic issues:
>  
> - With force_mld_version set to 0 (we expect "MLDv2 with MLDv1 fallback"), we saw only MLDv2 messages, the fallback to MLDv1 didn't seem to work, when we sent MLDv1 messages to the unit.
> - With force_mld_version set to 1 (we expect "MLDv1 only mode"), we also saw MLDv2 messages being generated.
>  
> Can someone give a general statement about the MLD implementation maturity in kernel 2.6.32.60? Are there known bugs that would explain the above observations?
> 
> We need to see whether it makes sense to put further effort in investigating/fixing any MLD related issue we see.
> 
> If this is the wrong list to ask this kind of question, please point me to the correct one.

It would be great if you could share test results with newer kernel with us.
Last time I checked we did correctly fallback to MDLv1 mode but it has been a
while.

If you come up with a specific patch from Daniel's series which fixes the
issues you are seeing, we can think about including this to stable.

There are still some issues in mld: we are currently a bit too noisy for my
taste (e.g. on re-enabling interfaces). This is a big problem for large
wireless networks e.g.

Thanks,

  Hannes

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