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

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Message-ID: <514e990b-50c6-419b-96f2-09c3d04a2fda@intel.com>
Date: Wed, 8 May 2024 08:05:29 +0300
From: Sasha Neftin <sasha.neftin@...el.com>
To: Andrew Lunn <andrew@...n.ch>, Ricky Wu <en-wei.wu@...onical.com>
CC: <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>,
	"Ruinskiy, Dima" <dima.ruinskiy@...el.com>, "Lifshits, Vitaly"
	<vitaly.lifshits@...el.com>, naamax.meir <naamax.meir@...ux.intel.com>,
	"Avivi, Amir" <amir.avivi@...el.com>, "Nguyen, Anthony L"
	<anthony.l.nguyen@...el.com>, "Keller, Jacob E" <jacob.e.keller@...el.com>
Subject: Re: [Intel-wired-lan] [PATCH v2 2/2] e1000e: fix link fluctuations
 problem

On 07/05/2024 15:31, Andrew Lunn wrote:
> On Fri, May 03, 2024 at 06:18:36PM +0800, Ricky Wu wrote:
>> As described in https://bugzilla.kernel.org/show_bug.cgi?id=218642,
>> Intel I219-LM reports link up -> link down -> link up after hot-plugging
>> the Ethernet cable.
> 
> Please could you quote some parts of 802.3 which state this is a
> problem. How is this breaking the standard.
> 
> 	Andrew

In I219-* parts used LSI PHY. This PHY is compliant with the 802.3 IEEE 
standard if I recall correctly. Auto-negotiation and link establishment 
are processed following the IEEE standard and could vary from platform 
to platform but are not violent to the IEEE standard.

En-Wei, My recommendation is not to accept these patches. If you think 
there is a HW/PHY problem - open a ticket on Intel PAE.

Sasha