On Sun, Jan 10, 2021 at 09:49:03PM +0900, Vincent Mailhol wrote: > * The hardware rx timestamp of a local loopback message is the > hardware tx timestamp. This means that there are no needs to > implement SOF_TIMESTAMPING_TX_HARDWARE for CAN sockets. I can't agree with that statement. The local loopback is a special "feature" of CAN sockets, and some programs turn it off. Furthermore, requiring user space to handle CAN sockets differently WRT Tx time stamps is user-unfriendly. So I would strongly support adding SOF_TIMESTAMPING_TX_HARDWARE to the CAN layer in the future. (This isn't a criticism of the current patch, though.) Thanks, Richard
