[systemd-devel] Updating network file during boot

[Etienne Champetier]

Le jeu. 15 août 2024, 05:03, Henti Smith <henti at gaydonsmith.co.uk> a écrit :

> Hello Etienne
>
> I cannot find any info on how to extract this information from the current
> system.
>
> How would I go about doing that ?
>

Try

cat /sys/devices/pci0000:00/0000:00:10.0/0000:05:00.0/firmware_node/sun
cat /sys/devices/pci0000:00/0000:00:10.0/firmware_node/sun



>
> Kind regards
> Henti
>
> On Tue, 13 Aug 2024 at 17:56, Etienne Champetier <
> champetier.etienne at gmail.com> wrote:
>
>> Hello Henti,
>>
>> Le mar. 13 août 2024 à 12:16, Henti Smith <henti at gaydonsmith.co.uk> a
>> écrit :
>> >
>> > Good day everybody.
>> >
>> > I've searched high and low and cannot seem to find an answer for what
>> I'm trying to do. The most relevant I found was this [1] thread in 2020,
>> but only because I'm using a script to change the contents of my .link
>> files during boot, which is not working constantly.
>> >
>> > Some things to note:
>> > 1. The hardware is sample hardware so Mac addresses are 00:00:00:00:00.
>> > 2. The hardware has an external hot-swap PCId port that takes a board
>> for VGA out.
>> > 3. We're attempting to configure two interfaces.
>> >
>> > The problem is when the board is attached the PCI numbering of the two
>> interfaces change. With the board attached, it's 5 and 6, without it 4 and
>> 5.
>> >
>> > Normally this would not be a problem, since you can Match on mac
>> address, but in this case, both have the same mac address of 00:00:00:00:00.
>> >
>> > My attempt to fix this was to create a script [2] that enumerated the
>> PCI ports for the hardware manufacturer and use that information to update
>> the link files [2] before systemd-networkd starts, but this does not work
>> constantly.
>> >
>> > Are there any other recommendations to resolve this situation or if my
>> approach is the only real way to do this, how can I ensure my script is
>> executed before systemd uses the link files to apply the interface
>> configuration ?
>>
>> Does the platform provide ACPI _SUN info by any chance ?
>> https://github.com/systemd/systemd/pull/33682
>>
>> Best
>> Etienne
>>
>> >
>> > [1]
>> https://lists.freedesktop.org/archives/systemd-devel/2020-June/044784.html
>> > [2] https://paste.mozilla.org/jgcCyo9A
>> > [3] https://paste.mozilla.org/zXQYpXpd
>> >
>> > Any guidance would be most welcome.
>> >
>> > Kind regards
>> > Henti Smith
>>
>
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