linux-kernel - Re: [PATCH] bonding: allow bond in mode balance-alb to work properly in bridge -try4

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Message-ID: <20090327084138.GA4582@psychotron.englab.brq.redhat.com>
Date:	Fri, 27 Mar 2009 09:41:39 +0100
From:	Jiri Pirko <jpirko@...hat.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, jgarzik@...ox.com,
	shemminger@...ux-foundation.org, bridge@...ts.linux-foundation.org,
	fubar@...ibm.com, bonding-devel@...ts.sourceforge.net,
	mschmidt@...hat.com, dada1@...mosbay.com
Subject: Re: [PATCH] bonding: allow bond in mode balance-alb to work
	properly in bridge -try4

Fri, Mar 27, 2009 at 08:53:13AM CET, kaber@...sh.net wrote:
> David Miller wrote:
>> From: Jiri Pirko <jpirko@...hat.com>
>> Date: Thu, 26 Mar 2009 16:52:06 +0100
>>
>>> (resend, updated changelog, hook moved into skb_bond_should_drop,
>>> skb_bond_should_drop ifdefed)
>>>
>>> Hi all.
>>>
>>> The problem is described in following bugzilla:
>>> https://bugzilla.redhat.com/show_bug.cgi?id=487763
>>  ...
>>> This patch solves the situation in the bonding without touching bridge code,
>>> as Patrick suggested. For every incoming frame to bonding it searches the
>>> destination address in slaves list and if any of slave addresses matches, it
>>> rewrites the address in frame by the adress of bonding master. This ensures that
>>> all frames comming thru the bonding in alb mode have the same address.
>>>
>>> Signed-off-by: Jiri Pirko <jpirko@...hat.com>
>>
>>
>> I don't like the hook, but if that's how it's best done....
>>
>> Patrick, please review this.
>
> Me neither, but I don't think this approach can be done without the
> hook. While I still find it questionable whether this mode really
> needs to be supported for a bridge at all

Well there is I think nothing unusual in this net scheme. And by for example
the increasing setups with kvm/bridging it will be needed more and more.

> , an alternative approach
> would be to have bonding add FDB entries for all secondary MACs to
> make bridging treat them as local.

Yes - that is the clear way. But there's not really straihtforward way to do
this. The clear approach would be to extend struct net_device for list of these
mac addresses and let the drivers (binding) fill it and bridge to process it.
But I don't know.

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