[systemd-devel] Updating network file during boot

[Henti Smith]

On Thu, 15 Aug 2024 at 14:46, Silvio Knizek <killermoehre at gmx.net> wrote:

> Am Donnerstag, dem 15.08.2024 um 14:07 +0100 schrieb Henti Smith:
> > Hello again.
> >
> > I've tried multiple ways of matching and none seem to be working.
> >
> > I removed all the configuration in /etc/systemd/network, run
> update-initramfs and rebooted.
> >
> > The resulting network configuration for the marvell devices was:
> > root at av20-mvc-01:~# udevadm info /sys/class/net/eno2
> > P: /devices/pci0000:00/0000:00:10.0/0000:05:00.0/net/eno2
> > L: 0
> > E: DEVPATH=/devices/pci0000:00/0000:00:10.0/0000:05:00.0/net/eno2
> > E: INTERFACE=eno2
> > E: IFINDEX=4
> > E: SUBSYSTEM=net
> > E: USEC_INITIALIZED=9048059
> > E: ID_NET_NAMING_SCHEME=v245
> > E: ID_NET_NAME_MAC=enx02000000000b
> > E: ID_NET_NAME_ONBOARD=eno2
> > E: ID_NET_LABEL_ONBOARD=Onboard ETHERNET Controller
> > E: ID_NET_NAME_PATH=enp5s0
> > E: ID_BUS=pci
> > E: ID_VENDOR_ID=0x11ab
> > E: ID_MODEL_ID=0x0f13
> > E: ID_PCI_CLASS_FROM_DATABASE=Network controller
> > E: ID_PCI_SUBCLASS_FROM_DATABASE=Ethernet controller
> > E: ID_VENDOR_FROM_DATABASE=Marvell Technology Group Ltd.
> > E: ID_PATH=pci-0000:05:00.0
> > E: ID_PATH_TAG=pci-0000_05_00_0
> > E: ID_NET_DRIVER=oak
> > E: ID_NET_LINK_FILE=/usr/lib/systemd/network/99-default.link
> > E: SYSTEMD_ALIAS=/sys/subsystem/net/devices/eno2
> > E: TAGS=:systemd:
> >
> > and:
> > root at av20-mvc-01:~# udevadm info /sys/class/net/enp6s0
> > P: /devices/pci0000:00/0000:00:11.0/0000:06:00.0/net/enp6s0
> > L: 0
> > E: DEVPATH=/devices/pci0000:00/0000:00:11.0/0000:06:00.0/net/enp6s0
> > E: INTERFACE=enp6s0
> > E: IFINDEX=5
> > E: SUBSYSTEM=net
> > E: USEC_INITIALIZED=9004147
> > E: ID_NET_NAMING_SCHEME=v245
> > E: ID_NET_NAME_MAC=enx02000000000c
> > E: ID_NET_NAME_PATH=enp6s0
> > E: ID_BUS=pci
> > E: ID_VENDOR_ID=0x11ab
> > E: ID_MODEL_ID=0x0f13
> > E: ID_PCI_CLASS_FROM_DATABASE=Network controller
> > E: ID_PCI_SUBCLASS_FROM_DATABASE=Ethernet controller
> > E: ID_VENDOR_FROM_DATABASE=Marvell Technology Group Ltd.
> > E: ID_PATH=pci-0000:06:00.0
> > E: ID_PATH_TAG=pci-0000_06_00_0
> > E: ID_NET_DRIVER=oak
> > E: ID_NET_LINK_FILE=/usr/lib/systemd/network/99-default.link
> > E: SYSTEMD_ALIAS=/sys/subsystem/net/devices/enp6s0
> > E: TAGS=:systemd:
> >
> > As you can see it's generated by
> /usr/lib/systemd/network/99-default.link which uses OriginalName=*.
> >
> > Reading the man page the only options that can take glob matching are
> Path (ID_PATH), Driver (ID_NET_DRIVER), Type (DEVTYPE) and OriginalName
> (INTERFACE).
> >
> > ID_PATH changes when the board is connected and not, it's not usable.
> > ID_NET_DRIVER is the same for both.
> > DEVTYPE is not presented on these devices
> >
> > This only leaves INTERFACE, however the man page again states:
> > This cannot be used to match on names that have already been changed
> from userspace. Caution is advised when matching on kernel-assigned names,
> as they are known to be unstable between reboots.
> >
> > Which seems to mean I'm back to square one.
> >
> > I was really hoping that I could use DEVPATH to glob match on, but this
> seems to not be possible. the only way to match on DEVPATH is using
> Property. however there is no glob matching with that option.
> >
> > Having said that, I'm thinking that since you can have multiple options
> using Property thata ll need to match, I can possbly create four link files
> with the two sets of PCI and Drives matching to ensure that with or without
> the board two interface will match.
> >
> > I will attempt this and feed back.
> >
> > Kind regards
> > Henti
>
> Hi Henti,
>
> why can't you [Match] onto `Property="ID_NET_LABEL_ONBOARD=Onboard
> ETHERNET Controller"`? Is your systemd older than 243? Than you should
> really update.
>
> BR
> Silvio
>

Hi Silvio,

I'm on systemd 245 (Ubuntu focal) and I can likely match on
Property="ID_NET_LABEL_ONBOARD=Onboard ETHERNET Controller". I'll give that
a test as well.

My existing config is using Path=pci-0000:05:00.0 and that works, but when
I try to match on Property=Path=pci-0000:05:00.0 Driver=oak,it doesn't.
this doesn't make sense to me.

I was hoping that I can have specific matches for hte PCI addresses and
Drivers that I can use to match both sets of configuration with and without
the hotplug board.

Henti
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