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

Kurt Kanzenbach
2022-01-21T11:05:46Z

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On Thu Jan 20 2022, Vladimir Oltean wrote:
> Hi Richard,
>
> On Mon, Jan 03, 2022 at 03:25:54PM -0800, Richard Cochran wrote:
>> Make the sysfs knob writable, and add checks in the ioctl and time
>> stamping paths to respect the currently selected time stamping layer.
>>
>> Signed-off-by: Richard Cochran <richardcochran@gmail.com>
>> ---
>
> Could we think of a more flexible solution? Your proposal would not
> allow a packet to have multiple hwtstamps, and maybe that would be
> interesting for some use cases (hardware testing, mostly).

One use case i can think of for having multiple hwtimestamps per packet
is crosstimestamping. Some devices such as hellcreek have multiple PHCs
and allow generation of such crosstimestamps.

Thanks,
Kurt

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