[systemd-devel] systemd-networkd: setting the MAC address for a .netdev unit?

[poma]

On 12.05.2014 12:22, Tom Gundersen wrote:
> On Mon, May 12, 2014 at 10:43 AM, Matthias Schiffer
> <mschiffer at universe-factory.net> wrote:
>>>>> This should really be added as AFAICT there is currently no way to match
>>>>> on virtual devices like briges, TAP devices, batman-adv devices, etc...
>>>>> which have neither a persistent MAC address nor an ID_PATH to match on.
>>>>
>>>> So I think what we should do here is to allow MAC address (and other
>>>> things) to be set when creating the netdevs. I made an attempt at this
>>>> by generating a "predictable" one based on the interface name and the
>>>> machine-id. Would that do it for you, or are you after a _specific_
>>>> mac address, rather than just one that is always the same? I had to
>>>> revert the code doing this for now as there was a kernel bug, however
>>>> we'll hopefully get that sorted soon and then get back to this.
>>>>
>>>> Cheers,
>>>>
>>>> Tom
>>>>
>>>
>>> For my usecase, a predictable, but otherwise random MAC address would
>>> do. But I also see that setting an arbitrary MAC address (or any other
>>> link parameter) for a specific virtual device is useful as well
>>> (especially as it is possible to do so with real devices). As virtual
>>> devices are almost always created with specific names, a Name= match for
>>> .link units would make the most sense in my opinion.
>>>
>>> As a workaround, I've added the following udev rule to
>>> 80-net-setup-link.rules for now to allow matching for virtual devices
>>> with Path= matches:
>>>
>>> ENV{DEVPATH}=="/devices/virtual/net/*", ENV{ID_PATH}=="",
>>> ENV{ID_PATH}="virtual-$kernel"
>>>
>>> Thanks,
>>> Matthias
>>>
>>
>> Ping. There is still no way to match for virtual devices in .link units
>> without my workaround. Is it planned to add something similar? Would a
>> facility allowing to configure the MAC address of a virtual device be in
>> the scope of the TODO point "add reduced [Link] support to .network files"?
> 
> Yes. What we will do is that by default we will generate a MAC address
> that will be stable between reboots and use that, but we will also
> allow the MAC address to be set manually in the [NetDev] section (in
> the same way as in the .link files).
> 
> The kernel interface for doing this is currently broken, but a patch
> has been submitted to fix it, and once that hits the stable kernels I
> guess we can start using it (otherwise we are just going to get heaps
> of weird bug reports).
> 
> Cheers,
> 
> Tom

Ping.
Care to paste link to a patch?


poma