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

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Date: Mon, 13 May 2024 09:04:57 +0300
From: Sasha Neftin <sasha.neftin@...el.com>
To: Andrew Lunn <andrew@...n.ch>
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>, "Lifshits, Vitaly"
	<vitaly.lifshits@...el.com>
Subject: Re: [Intel-wired-lan] [PATCH v2 2/2] e1000e: fix link fluctuations
 problem

On 10/05/2024 15:32, Andrew Lunn wrote:
>>> 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

Not only in the theory. On the link partner IEEE 1000BASE-T Status 
Register - Address 10, Link Partner 1000BASE-T Half-Duplex Capability is 
0. (1000BAS-T HD not advertised). I believe here is some false positive 
indication during the auto-negotiation process.(this is not related to 
the link fluctuation)

Sasha