netdev - Re: [PATCH net-next] macvlan: handle fragmented multicast frames

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Message-ID: <4E8F2C57.5020600@candelatech.com>
Date:	Fri, 07 Oct 2011 09:44:07 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] macvlan: handle fragmented multicast frames

On 10/06/2011 01:28 PM, Eric Dumazet wrote:
> Le mercredi 05 octobre 2011 à 15:35 -0700, Ben Greear a écrit :
>
>> If someone wants to cook up macvlan-ip-defrag patch I'll be happy
>> to test it.  But, as far as I can tell, this problem can happen on
>> any two interfaces.  The reason that some of mine work (.1q vlans)
>> and macvlan didn't is probably because those were separated by
>> some virtual network links that imparted extra delay...so the
>> vlan consumed all its fragments and passed the complete pkt up
>> the stack before the mac-vlan ever saw the initial frame.
>>
>> With this in mind, it seems that using multiple udp multicast
>> sockets bound to specific devices is fundamentally broken for
>> fragmented packets.
>>
>> I have no pressing need for this feature, so now that I better understand
>> the problem I can just document it and move on to other things.
>>
>> Thanks for all the help.
>>
>
> Please test following patch (note I had no time to test it, sorry !)

I hope to test this soon, but lots of other things piled up all
at once, so might be a few days.

Thanks,
Ben

>
> Based on net-next tree, might apply on 3.0 kernel...
>
> [PATCH net-next] macvlan: handle fragmented multicast frames
>
> Fragmented multicast frames are delivered to a single macvlan port,
> because ip defrag logic considers other samples are redundant.
>
> Implement a defrag step before trying to send the multicast frame.


-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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