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

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Message-ID: <20230512102911.qnosuqnzwbmlupg6@skbuf>
Date: Fri, 12 May 2023 13:29:11 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: "Russell King (Oracle)" <linux@...linux.org.uk>,
	Andrew Lunn <andrew@...n.ch>,
	Köry Maincent <kory.maincent@...tlin.com>,
	netdev@...r.kernel.org, glipus@...il.com,
	maxime.chevallier@...tlin.com, vadim.fedorenko@...ux.dev,
	richardcochran@...il.com, gerhard@...leder-embedded.com,
	thomas.petazzoni@...tlin.com, krzysztof.kozlowski+dt@...aro.org,
	robh+dt@...nel.org
Subject: Re: [PATCH net-next RFC v4 2/5] net: Expose available time stamping
 layers to user space.

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.