netdev - Re: [Intel-wired-lan] [PATCH v2 2/2] e1000e: fix link fluctuations problem

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Message-ID: <5669c185-db96-4ac2-81d5-2198060ae77d@lunn.ch>
Date: Fri, 10 May 2024 14:32:22 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Sasha Neftin <sasha.neftin@...el.com>
Cc: "Ruinskiy, Dima" <dima.ruinskiy@...el.com>,
	Ricky Wu <en-wei.wu@...onical.com>, netdev@...r.kernel.org,
	rickywu0421@...il.com, linux-kernel@...r.kernel.org,
	edumazet@...gle.com, intel-wired-lan@...ts.osuosl.org,
	kuba@...nel.org, anthony.l.nguyen@...el.com, pabeni@...hat.com,
	davem@...emloft.net, "Lifshits, Vitaly" <vitaly.lifshits@...el.com>,
	"naamax.meir" <naamax.meir@...ux.intel.com>,
	"Avivi, Amir" <amir.avivi@...el.com>,
	"Keller, Jacob E" <jacob.e.keller@...el.com>
Subject: Re: [Intel-wired-lan] [PATCH v2 2/2] e1000e: fix link fluctuations
 problem

> > It would be interesting to see what the link partner sees. What does
> > it think the I219-LM is advertising? Is it advertising 1000BaseT_Half?
> 
> i219 parts come with LSI PHY. 1000BASE-T half-duplex is not supported.
> 1000BASET half-duplex not advertised in IEEE 1000BASE-T Control Register 9.

That is the theory. But in practice? What does the link partner really
see? I've come across systems which get advertisement wrong. However,
in that case, i suspect it is the software above the PHY, not the PHY
itself which was wrong.

	Andrew