Re: [PATCH net-next RFC v4 2/5] net: Expose available time stamping layers to user space.

Vladimir Oltean
2023-05-12T10:29:36Z

On Thu, May 11, 2023 at 04:16:25PM -0700, Jakub Kicinski wrote:
> > I mean, I can't ignore the fact that there are NICs that can provide
> > 2-step TX timestamps at line rate for all packets (not just PTP) for
> > line rates exceeding 10G, in band with the descriptor in its TX
> > completion queue. I don't want to give any names, just to point out
> > that there isn't any inherent limitation in the technology.
>
> Oh, you should tell me, maybe off-list then. 'Cause I don't know any.

I hope the examples given in private will make you reconsider the
validity of my argument about DMA timestamps.