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

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Message-ID: <Z-8ZFzlAl1zys63e@shell.armlinux.org.uk>
Date: Fri, 4 Apr 2025 00:26:15 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Alexander Duyck <alexander.duyck@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>,
	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 Thu, Apr 03, 2025 at 02:53:22PM -0700, Alexander Duyck wrote:
> How is it not a fixed link? If anything it was going to be more fixed
> than what you described above.

I had to laugh at this. Really. I don't think you quite understand the
case that Andrew was referring to.

While he said MAC to MAC, he's not just referring to two MACs that
software can program to operate at any speed, thus achieving a link
without autoneg. He is also talking about cases where one end is
fixed e.g. by pinstrapping to a specific configuration including
speed, and using anything different on the host MAC side results in
no link.

In that latter case, I don't think you could come up with something
that is "more fixed" than that, because using anything other than
the specified parameters means no link!

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!