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SubjectRe: [PATCH v3 1/1] can: dev: add software tx timestamps
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.)


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