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Date:   Tue, 26 Mar 2019 11:31:15 +0100
From:   Michal Kubecek <>
To:     Jiri Pirko <>
Cc:     David Miller <>,,
        Jakub Kicinski <>,
        Andrew Lunn <>,
        Florian Fainelli <>,
        John Linville <>,
        Stephen Hemminger <>,
Subject: Re: [PATCH net-next v5 01/22] rtnetlink: provide permanent hardware
 address in RTM_NEWLINK

On Tue, Mar 26, 2019 at 11:08:36AM +0100, Jiri Pirko wrote:
> I don't think we should put permaddr if driver did not set it. 2
> solutions:
> 1) provide a helper that driver will use to set the perm_addr. This
>    helper sets a "valid bit". Then you only put IFLA_PERM_ADDRESS
>    in case the "valid bit" is set.
> 2) Assuming that no driver would set permaddr to all zeroes,
>    don't put IFLA_PERM_ADDRESS in case permadd is all zeroes.

I already replied to similar suggestion in v4 discussion:

But I don't have really strong opinion about this. The problem with not
being able to distinguish between "no/unknown permanent address" and
"old kernel not providing the information" is going to become less
important over time.


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