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Date:   Wed, 28 Dec 2022 11:15:01 +0200
From:   Leon Romanovsky <leon@kernel.org>
To:     Alexander Duyck <alexander.duyck@gmail.com>
Cc:     Jakub Kicinski <kuba@kernel.org>,
        Lixue Liang <lianglixuehao@126.com>,
        anthony.l.nguyen@intel.com, linux-kernel@vger.kernel.org,
        jesse.brandeburg@intel.com, davem@davemloft.net,
        edumazet@google.com, pabeni@redhat.com, netdev@vger.kernel.org,
        lianglixue@greatwall.com.cn
Subject: Re: [PATCH v7] igb: Assign random MAC address instead of fail in
 case of invalid one
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On Mon, Dec 19, 2022 at 07:30:45AM -0800, Alexander Duyck wrote:
> On Sun, Dec 18, 2022 at 12:41 AM Leon Romanovsky <leon@kernel.org> wrote:
> >
> > On Wed, Dec 14, 2022 at 12:50:16PM -0800, Jakub Kicinski wrote:
> > > On Wed, 14 Dec 2022 20:53:30 +0200 Leon Romanovsky wrote:
> > > > On Wed, Dec 14, 2022 at 08:51:06AM -0800, Jakub Kicinski wrote:
> > > > > On Wed, 14 Dec 2022 09:22:13 +0200 Leon Romanovsky wrote:
> > > > > > NAK to any module driver parameter. If it is applicable to all drivers,
> > > > > > please find a way to configure it to more user-friendly. If it is not,
> > > > > > try to do the same as other drivers do.
> > > > >
> > > > > I think this one may be fine. Configuration which has to be set before
> > > > > device probing can't really be per-device.
> > > >
> > > > This configuration can be different between multiple devices
> > > > which use same igb module. Module parameters doesn't allow such
> > > > separation.
> > >
> > > Configuration of the device, sure, but this module param is more of
> > > a system policy.
> >
> > And system policy should be controlled by userspace and applicable to as
> > much as possible NICs, without custom module parameters.
> >
> > I would imagine global (at the beginning, till someone comes forward and
> > requests this parameter be per-device) to whole stack parameter with policies:
> >  * Be strict - fail if mac is not valid
> >  * Fallback to random
> >  * Random only ???
> >
> > Thanks
> 
> So are you suggesting you would rather see something like this as a
> sysctl then? Maybe something like net.core.netdev_mac_behavior where
> we have some enum with a predetermined set of behaviors available? I
> would be fine with us making this a global policy if that is the route
> we want to go. It would just be a matter of adding the sysctl and an
> accessor so that drivers can determine if it is set or not.

Something like that and maybe convert drivers and/or to honor this policy.

Thanks