netdev - Re: The bonding driver should notify userspace of MAC address change

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Date:	Fri, 15 Apr 2011 20:40:20 +0200
From:	Nicolas de Pesloüan 
	<nicolas.2p.debian@...il.com>
To:	Michał Górny <mgorny@...too.org>
CC:	netdev@...r.kernel.org, roy@...ples.name,
	Jay Vosburgh <fubar@...ibm.com>,
	Andy Gospodarek <andy@...yhouse.net>
Subject: Re: The bonding driver should notify userspace of MAC address change

Le 15/04/2011 18:44, Michał Górny a écrit :
> Hello,
>
> I'd like to file a feature request for the bonding driver. Currently,
> there is no way for userspace to know whether the driver actually gets
> a MAC address. This results in the fact that dhcpcd sends MAC-less DHCP
> packets through bonding device if it is started before bond gets any
> slaves.

A similar subject, involving bridge instead of bonding, was discussed a few weeks ago in this 
thread: http://marc.info/?l=linux-netdev&m=129939017116310&w=2

In particular, I suggested to apply Stephen's suggestion not only to bridge but also to bonding.

(http://marc.info/?l=linux-netdev&m=129948385024680&w=2)

A bonding device should not report link up to userspace until at least one slave is present and up.

And possibly, a bonding device should report link down if all slaves are down or all slave were removed.

Jay, Andy, does this sounds sensible to you?

> I've reported that problem upstream [1], and the author suggested that
> the bonding driver would have to notify the userspace about MAC address
> change, suggesting using RTM_NEWLINK message.
>
> I wanted to write a patch for that but I don't seem to see any
> appropriate IFF_* flag for that particular kind of event. dhcpcd author
> suggested using 'ifi->ifi_change = ~0U' but I'm not sure if it's
> appropriate.
>
> Could you either add such a kind of notification or give me a tip on
> how to proceed with adding it? Thanks in advance.
>
> [1] http://roy.marples.name/projects/dhcpcd/ticket/212

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