6.19.0-rc6 CAN regression

Hello,
there is some issue with CAN on the latest linux 6.19 RC, canfdtest fails with send failed: Invalid argument fails on various SoC (NXP i.MX8MP, i.MX8QM, i.MX6 ... and TI AM62 and maybe more).

Is this known and already being addressed? I have seen some recent PR and patches, but I am not sure they are fixing this issue.

Thanks,
Francesco

Hello Francesco,

Yes, this is already fixed here:

https://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can.git/log/?h=testing

in this patch:
"can: dev: alloc_candev_mqs(): add missing default CAN capabilities"

https://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can.git/commit/?h=testing&id=375629c92fd842bc2a229bb34c4453f62e097169

The PR is waiting for upstream:
https://lore.kernel.org/linux-can/[email protected]/

When you apply the above patch, it should just work again.

Best regards,
Oliver

If you can't apply the fix or you want to stay on the 6.19-rc6 upstream kernel, it is also possible to make a workaround with the "ip" tool you use for the bitrate configuration.

The issued does not show up, when the ctrlmode is changed(!), e.g. when you enable triple-sampling, one-shot or cc-len8-dlc mode:

Instead of

# ip link set can0 type can bitrate 500000

try

# ip link set can0 type can bitrate 500000 cc-len8-dlc on

But the fix will be in the mainline repo soon.

Best regards,
Oliver