netdev - Re: [PATCH] bonding: convert to ndo_fix

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Message-ID: <20110507073727.GA4522@rere.qmqm.pl>
Date:	Sat, 7 May 2011 09:37:27 +0200
From:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:	Jay Vosburgh <fubar@...ibm.com>
Cc:	netdev@...r.kernel.org, Andy Gospodarek <andy@...yhouse.net>
Subject: Re: [PATCH] bonding: convert to ndo_fix_features

On Fri, May 06, 2011 at 11:18:04AM -0700, Jay Vosburgh wrote:
> Michał Mirosław <mirq-linux@...e.qmqm.pl> wrote:
> >This should also fix updating of vlan_features and propagating changes to
> >VLAN devices on the bond.
> >
> >Side effect: it allows user to force-disable some offloads on the bond
> >interface.
> >
> >Note: NETIF_F_VLAN_CHALLENGED is managed by bond_fix_features() now.
> >
> >BTW, What are the problems in creating VLAN devices on an empty bond
> >(as stated in one of bond_setup() comments)?
> 	If there are no slaves, then the bond does not have a MAC
> address assigned (because it gets its initial MAC from the first slave).
> It's therefore impossible to pass a MAC address up to the VLAN
> interface.
> 
> 	So the limitation is that the bond must have at least one slave
> before a VLAN may be configured above it.

Hmm. That might be worked aroud by generating random MAC then. This would
allow the user to first set a new MAC, create VLANs and then add slaves
when they show up.

Best Regards,
Michał Mirosław
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