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

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Message-ID: <20230906112203.4ea69bf8@kmaincent-XPS-13-7390>
Date: Wed, 6 Sep 2023 11:22:03 +0200
From: Köry Maincent <kory.maincent@...tlin.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Jakub Kicinski <kuba@...nel.org>, Richard Cochran
 <richardcochran@...il.com>, Vladimir Oltean <vladimir.oltean@....com>,
 "Russell King (Oracle)" <linux@...linux.org.uk>, netdev@...r.kernel.org,
 glipus@...il.com, maxime.chevallier@...tlin.com, vadim.fedorenko@...ux.dev,
 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 Tue, 5 Sep 2023 22:29:51 +0200
Andrew Lunn <andrew@...n.ch> wrote:

> > Maybe we should try to enumerate the use cases, I don't remember now
> > but I think the concern was that there may be multiple PHYs?  
> 
> You often see a Marvell 10G PHY between a MAC and an SFP cage. You can
> then get a copper SFP module which has a PHY in it.
> 
> So:
> 
> "Linux" NIC: [DMA MAC][PHY][PHY] 
> 
> And just to make it more interesting, you sometimes see:
> 
> [MAC] - MII MUX -+---[PHY][PHY]
>                  |
>                  +---[PHY]
> 
> This is currently not supported, but there is work in progress to
> address this, by giving each PHY and ID, and extending the netlink
> ethtool so you can enumerate PHYs and individually configure them.

Yes, I have talked to maxime about his PHY ID support patch series.

> And i pointed out maybe the worst case scenario:
> 
> [MAC][PHY][PHY][MAC]switch core[MAC][PHY][PHY]

always more complex! :)