Forgive me, if that’s a topic that already came up… …reading the recent patch sets where hardware CAN capabilities are exposed to userland, I wonder why we still don’t have standardized ioctls (or whatever other means) to control the hardware arbitration masks that seem to be present in almost all CAN controllers. In particular, I’ve stumbled over the https://github.com/craigpeacock/mcp251x, which is a driver that exposes the hardware filtering at module load time. Wouldn’t it be helpful to have a standardized way to control this? Also the isotp could make use of this. Cheers, :M: