Cannot set manual link speed over auto negotiation

[Nobuto Murata]

There are some occasions when we'd like to set a link speed explicitly including a troubleshooting phase.

systemd-networkd supports that operation in the [Link] section like the MTUBytes value. It would be nice if netplan allows to pass those parameters to networkd.

[systemd.link(5)]
> BitsPerSecond=
> The speed to set for the device, the value is rounded down to the
> nearest Mbps. The usual suffixes K, M, G are supported and are
> understood to the base of 1000.
>
> Duplex=
> The duplex mode to set for the device. The accepted values are half
> and full.
>
> AutoNegotiation=
> Takes a boolean. If set to yes, automatic negotiation of
> transmission parameters is enabled. Autonegotiation is a procedure
> by which two connected ethernet devices choose common transmission
> parameters, such as speed, duplex mode, and flow control. When
> unset, the kernel's default will be used.
>
> Note that if autonegotiation is enabled, speed and duplex settings
> are read-only. If autonegotiation is disabled, speed and duplex
> settings are writable if the driver supports multiple link modes.

[Lukas Märdian (slyon)]

related to bug #2016831

[Lukas Märdian (slyon)]

Added as a feature request. Remember that you could make use of a systemd override file as a workaround for now, e.g. something like:

/etc/systemd/network/10-netplan-eth0.link.d/override.conf

see:
https://www.freedesktop.org/software/systemd/man/systemd.link.html#Description

[Maxime Accadia (maxacc)]

I have a similar issue for netplan support for Flow control configuration :

       RxFlowControl

       TxFlowControl

       AutoNegotiationFlowControl

in systemd.link(5)

Should netplan add a passthrough option like it does for NetworkManager ?

Should I create an other bug report ?