Get CANBus to come up on boot with txqueuelen=1000

[danzimmerman]

Currently I have a can-init function in .bash_aliases to bring up the CAN interfaces.

I'd rather that they come up on boot.

[danzimmerman]

systemd way:

https://askubuntu.com/a/1376096

[danzimmerman]

systemd-networkd CAN man page here.

BitRate=

Per this Reddit link TransmitQueueLength= is a thing, but in the link section. See [Link] options here.

So I think we want in /etc/systemd/network/80-can.network

[Match]
Name=can*

[CAN]
BitRate=1000K

[Link]
TransmitQueueLength=1234

We apparently also need

sudo systemctl enable systemd-networkd

Will this cause other problems (for example with NetworkManager?)

[danzimmerman]

This didn't quite work. They come up but the txqueuelen is not set:

3: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UP group default qlen 10
    link/can
4: can1: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UP group default qlen 10
    link/can

Trying the fix here that we need the CAN to match before 73 USB.

There was also a typo, we need in /etc/systemd/network/70-can.link:

[Match]
Name=can*

[Link]
TransmitQueueLength=1234

[danzimmerman]

Changed the title to reflect the fact that it just needs a fix to the queue length problem now.

[danzimmerman]

If I put it in the .network file I get:

Oct 12 20:11:02 computer systemd-networkd[2209]: /etc/systemd/network/70-can.network:8: Unknown key 'TransmitQueueLength' in section [Link], ignoring.

I'm getting with sudo journalctl | grep 70-can.link:

Oct 12 20:13:11 computer systemd-udevd[332]: /etc/systemd/network/70-can.link: No valid settings found in the [Match] section, ignoring file. To match all interfaces, add OriginalName=* in the [Match] section.
Oct 12 20:13:40 computer systemd-udevd[332]: /etc/systemd/network/70-can.link:2: Unknown key 'Name' in section [Match], ignoring.

So need to dig into the man page a little more.