netdev - Re: [PATCH v8 net-next 4/5] net: ena: PHC stats through sysfs

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Message-ID: <ed0fb5d8-5cd7-446a-9637-493224af4fb3@lunn.ch>
Date: Thu, 6 Mar 2025 16:40:55 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Jakub Kicinski <kuba@...nel.org>
Cc: David Arinzon <darinzon@...zon.com>, David Miller <davem@...emloft.net>,
	netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
	Richard Cochran <richardcochran@...il.com>,
	"Woodhouse, David" <dwmw@...zon.com>,
	"Machulsky, Zorik" <zorik@...zon.com>,
	"Matushevsky, Alexander" <matua@...zon.com>,
	Saeed Bshara <saeedb@...zon.com>, "Wilson, Matt" <msw@...zon.com>,
	"Liguori, Anthony" <aliguori@...zon.com>,
	"Bshara, Nafea" <nafea@...zon.com>,
	"Schmeilin, Evgeny" <evgenys@...zon.com>,
	"Belgazal, Netanel" <netanel@...zon.com>,
	"Saidi, Ali" <alisaidi@...zon.com>,
	"Herrenschmidt, Benjamin" <benh@...zon.com>,
	"Kiyanovski, Arthur" <akiyano@...zon.com>,
	"Dagan, Noam" <ndagan@...zon.com>,
	"Bernstein, Amit" <amitbern@...zon.com>,
	"Agroskin, Shay" <shayagr@...zon.com>,
	"Ostrovsky, Evgeny" <evostrov@...zon.com>,
	"Tabachnik, Ofir" <ofirt@...zon.com>,
	"Machnikowski, Maciek" <maciek@...hnikowski.net>,
	Rahul Rameshbabu <rrameshbabu@...dia.com>,
	Gal Pressman <gal@...dia.com>,
	Vadim Fedorenko <vadim.fedorenko@...ux.dev>
Subject: Re: [PATCH v8 net-next 4/5] net: ena: PHC stats through sysfs

On Wed, Mar 05, 2025 at 06:36:37PM -0800, Jakub Kicinski wrote:
> On Wed, 5 Mar 2025 16:33:10 +0100 Andrew Lunn wrote:
> > > I asked them to do this.
> > > They are using a PTP device as a pure clock. The netdev doesn't support
> > > any HW timestamping, so none of the stats are related to packets.  
> > 
> > So how intertwined is the PHC with the network device? Can it be
> > separated into a different driver? Moved into drivers/ptp?
> > 
> > We have already been asked if this means network drivers can be
> > configured via sysfs. Clearly we don't want that, so we want to get
> > this code out of drivers/net if possible.
> 
> Is it good enough to move the relevant code to a ptp/ or phc/ dir
> under ...thernet/amazon/ena/ ? Moving it to ptp/ proper would require
> some weird abstractions, not sure if it's warranted? 

mtd devices have been doing this for decades. And the auxiliary bus
seems to be a reinvention of the mtd concepts.

As i said, it comes down to how intertwined the PHC is with the
network device.

	Andrew