Re: [PATCH RFC V1 net-next 3/4] net: Let the active time stamping layer be selectable.

[Richard Cochran]

On Mon, Jan 24, 2022 at 10:28:23AM +0100, Miroslav Lichvar wrote:

> FWIW, scm_timestamping has three fields and the middle one no longer
> seems to be used. If a new socket/timestamping option enabled all
> three (SW, MAC, PHY) timestamps in the cmsg, I think that would be a
> nice feature.

This won't work because:

- There would need to be seven^W eight, not three slots.

- Even with just three, the CMSG would have to have a bit that clearly
  identifies the new format.
 
> From an admin point of view, it makes sense to me to have an option to
> disable PHY timestamps for the whole device if there are issues with
> it. For debugging and applications, it would be nice to have an option
> to get all of them at the same time.

Right.  Those are two different use cases.  The present series
addresses the first one.  The second one entails making a new flavor
of time stamping API.

Thanks,
Richard