linux-kernel - Re: [PATCH v7] igb: Assign random MAC address instead of fail in case of invalid one

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Message-ID: <Y57SPPmui6cwD5Ma@unreal>
Date:   Sun, 18 Dec 2022 10:41:32 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Lixue Liang <lianglixuehao@....com>, anthony.l.nguyen@...el.com,
        linux-kernel@...r.kernel.org, jesse.brandeburg@...el.com,
        davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
        netdev@...r.kernel.org, lianglixue@...atwall.com.cn,
        Alexander H Duyck <alexander.duyck@...il.com>
Subject: Re: [PATCH v7] igb: Assign random MAC address instead of fail in
 case of invalid one

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