Re: [PATCH net-next v7 15/16] net: ethtool: ts: Let the active time stamping layer be selectable

[Richard Cochran]

On Tue, Nov 21, 2023 at 06:31:14PM +0100, Köry Maincent wrote:
> If I summarize, a solution could be this:
> 
> - Expand struct hwtstamp_config with a phc_index member for the SIOCG/SHWTSTAMP
>   commands.
>   To keep backward compatibility if phc_index is not set in the hwtstamp_config
>   data from userspace use the default hwtstamp (the default being selected as
>   done in my patch series).
>   Is this possible, would it breaks things?

You can't "expand" hwtstamp_config because it is an established ABI.

(You could introduce SIOC[GS]HWTSTAMP_2 with an expanded layout)

Thanks,
Richard