netdev - Re: [PATCH RFC] Providing a helper for PCS inband negotiation

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Message-ID: <20230515195616.uwg62f7hw47mktfu@skbuf>
Date: Mon, 15 May 2023 22:56:16 +0300
From: Vladimir Oltean <olteanv@...il.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Andrew Lunn <andrew@...n.ch>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Daniel Machon <daniel.machon@...rochip.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Felix Fietkau <nbd@....name>,
	Florian Fainelli <f.fainelli@...il.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Horatiu Vultur <horatiu.vultur@...rochip.com>,
	Ioana Ciornei <ioana.ciornei@....com>,
	Jakub Kicinski <kuba@...nel.org>, John Crispin <john@...ozen.org>,
	Jose Abreu <Jose.Abreu@...opsys.com>,
	Lars Povlsen <lars.povlsen@...rochip.com>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Marcin Wojtas <mw@...ihalf.com>,
	Mark Lee <Mark-MC.Lee@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	Paolo Abeni <pabeni@...hat.com>, Sean Wang <sean.wang@...iatek.com>,
	Steen Hegelund <Steen.Hegelund@...rochip.com>,
	Taras Chornyi <taras.chornyi@...ision.eu>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	UNGLinuxDriver@...rochip.com, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org
Subject: Re: [PATCH RFC] Providing a helper for PCS inband negotiation

Hello,

On Mon, May 15, 2023 at 01:22:50PM +0100, Russell King (Oracle) wrote:
> 1. Should 10GBASE-KR be included in the SGMII et.al. case in the code?
>    Any other interface modes that should be there? Obviously,
>    PHYLINK_PCS_NEG_NONE is not correct for 10GBASE-KR since it does use
>    inband AN. Does it make sense for the user to disable inband AN for
>    10GBASE-KR? If so, maybe it should be under the 1000base-X case.

What physical process (reference to IEEE 802.3 clause is fine) would be
controlled by the phylink_pcs_neg_mode() function for the so-called
10GBASE-KR phy-mode?