[systemd-devel] Updating network file during boot

[Henti Smith]

On Thu, 22 Aug 2024 at 09:59, Andrei Borzenkov <arvidjaar at gmail.com> wrote:

> On Thu, Aug 22, 2024 at 11:45 AM Henti Smith <henti at gaydonsmith.co.uk>
> wrote:
> ...
> >
> > I attempted to match the network devices using Property= as follows
> (using debug1 as an example):
> >
> > # Fixed name for debug1 (Debug Board)
> > [Match]
> > Property=Path=pci-0000:01:00.0 ID_NET_DRIVER=igb
> >
>
> "Path" is not udev property.
>

Ahh thank you for pointing this out.


> > udevadm info /sys/class/net/enp1s0
> > P: /devices/pci0000:00/0000:00:0c.0/0000:01:00.0/net/enp1s0
> > L: 0
> > E: DEVPATH=/devices/pci0000:00/0000:00:0c.0/0000:01:00.0/net/enp1s0
> > E: INTERFACE=enp1s0
> > E: IFINDEX=2
> > E: SUBSYSTEM=net
> > E: USEC_INITIALIZED=4788144
> > E: ID_NET_NAMING_SCHEME=v245
> > E: ID_NET_NAME_MAC=enx00a0c9000000
> > E: ID_OUI_FROM_DATABASE=Intel Corporation
> > E: ID_NET_NAME_PATH=enp1s0
> > E: ID_BUS=pci
> > E: ID_VENDOR_ID=0x8086
> > E: ID_MODEL_ID=0x1533
> > E: ID_PCI_CLASS_FROM_DATABASE=Network controller
> > E: ID_PCI_SUBCLASS_FROM_DATABASE=Ethernet controller
> > E: ID_VENDOR_FROM_DATABASE=Intel Corporation
> > E: ID_MODEL_FROM_DATABASE=I210 Gigabit Network Connection
> > E: ID_PATH=pci-0000:01:00.0
>
> "ID_PATH" is.
>
>
Further testing showed that "ID_PATH" Will not work either since both the
first ethernet and the ethernet on the debug board will use the same PCI
address and are both ID_NET_DRIVER=igb as well.


> > E: ID_PATH_TAG=pci-0000_01_00_0
> > E: ID_NET_DRIVER=igb
> > E: ID_NET_LINK_FILE=/usr/lib/systemd/network/99-default.link
> > E: SYSTEMD_ALIAS=/sys/subsystem/net/devices/enp1s0
> > E: TAGS=:systemd:
> >
>
> Also, you do not need to use Property for your match, it is just
>
> [Match]
> Path=pci-0000:01:00.0
> Driver=igb
>

I'll experiment further with the "Property=" option since the "Path" does
not include the bus ID which I need to match on.

Thank you for pointing out my misunderstanding of the documentation.

Kind regards
Henti
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