netdev - Re: [net PATCH 1/2] net: phy: Cleanup handling of recent changes to phy_lookup

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Message-ID: <CAKgT0UdmwJVQ8u8OXD3ttJ8rRY6QDRRfWoCd3Vku9fFFGj_BXA@mail.gmail.com>
Date: Sat, 5 Apr 2025 09:19:35 -0700
From: Alexander Duyck <alexander.duyck@...il.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: "Russell King (Oracle)" <linux@...linux.org.uk>, 
	Maxime Chevallier <maxime.chevallier@...tlin.com>, netdev@...r.kernel.org, 
	hkallweit1@...il.com, davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com
Subject: Re: [net PATCH 1/2] net: phy: Cleanup handling of recent changes to phy_lookup_setting

On Sat, Apr 5, 2025 at 8:52 AM Andrew Lunn <andrew@...n.ch> wrote:
>
> > Hmm, I'm guessing 50G is defined in 802.3 after the 2018 edition (which
> > is the latest I have at the moment.)

If you don't want the full document I think the 50G stuff is 802.3cd
as I recall. I will try to get to your replies later today. Will need
some time to read and process them.

> I have 2022 edition to hand. Clause 131 is Introduction to 50 GB/s
> networks. Clause 132 is the RS sublayer. Clause 133 is the PCS. Clause
> 134 RS-FEC, etc.
>
> IEEE makes 802.3 free to download, along with all the other 802
> standard, although it always takes me a while to find where to
> download it from.
>
>         Andrew

If you have access to the 2022 edition figure 135-2 is a good diagram
showing essentially what I am working with. Essentially everything
below the AUI would be the SFP. Our MAC essentially just does 50GMII
or CGMII and coming out the bottom is one or two lanes w/ NRZ or PAM4
depending on the PCS/PMA configuration. The LAUI-2 portion is only a
partial fit in that what we have is more 2 lanes of 25G than LAUI-2,
but I am having to overlap that with the 25G/50G consortium
implementation and they do match in the 50G non-FEC case.