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From: En-Wei WU <en-wei.wu@canonical.com>
Date: Tue, 7 May 2024 11:24:05 +0200
Message-ID: <CAMqyJG0kMFShx8Kir17mNZ1rD7SaBt2f_Wpv4ir+5-92v3bNaA@mail.gmail.com>
Subject: Re: [PATCH] e1000e: fix link fluctuations problem
To: Andrew Lunn <andrew@lunn.ch>
Cc: jesse.brandeburg@intel.co, anthony.l.nguyen@intel.com, 
	intel-wired-lan@lists.osuosl.org, davem@davemloft.net, edumazet@google.com, 
	kuba@kernel.org, pabeni@redhat.com, netdev@vger.kernel.org, 
	linux-kernel@vger.kernel.org, rickywu0421@gmail.com
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> Why PHY is this?
It's the Intel I219-LM, and I haven't found any other device having
the same issue.

> It might be the PHY manufacture has an errata, since
> this is probably not the MAC causing the problem, but the PHY itself.
Yes. The problem seems to be a PHY problem. I'm wondering if doing a
workaround on MAC like this patch is suitable.

For further information, please check here:
https://patchwork.ozlabs.org/project/intel-wired-lan/patch/20240503101836.32755-1-en-wei.wu@canonical.com/

On Tue, 7 May 2024 at 03:39, Andrew Lunn <andrew@lunn.ch> wrote:
>
> On Thu, May 02, 2024 at 05:12:15PM +0800, Ricky Wu wrote:
> > As described in https://bugzilla.kernel.org/show_bug.cgi?id=218642,
> > some e1000e NIC reports link up -> link down -> link up when hog-plugging
> > the Ethernet cable.
> >
> > The problem is because the unstable behavior of Link Status bit in
> > PHY Status Register of some e1000e NIC.
>
> Why PHY is this? It might be the PHY manufacture has an errata, since
> this is probably not the MAC causing the problem, but the PHY itself.
>
>         Andrew