linux-kernel - Re: [PATCH RFC v2 1/6] ethtool: add interface to read Tx hardware timestamping statistics

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Date: Wed, 13 Mar 2024 18:40:17 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Rahul Rameshbabu <rrameshbabu@...dia.com>
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Subject: Re: [PATCH RFC v2 1/6] ethtool: add interface to read Tx hardware
 timestamping statistics

On Wed, 13 Mar 2024 17:50:39 -0700 Rahul Rameshbabu wrote:
> > Should we give some guidance to drivers which "ignore" time stamping
> > requests if they used up all the "slots"? Even if just temporary until
> > they are fixed? Maybe we can add after all the fields something like:
> >
> >   For drivers which ignore further timestamping requests when there are
> >   too many in flight, the ignored requests are currently not counted by
> >   any of the statistics.  
> 
> I was actually thinking it would be better to merge them into the error
> counter temporarily. Reason being is that in the case Intel notices that
> their slots are full, they just drop traffic from my understanding
> today. If the error counters increment in that situation, it helps with
> the debug to a degree. EBUSY is an error in general.

That works, too, let's recommend it (FWIW no preference whether
in the entry for @err or somewhere separately in the kdoc).