linux-kernel - Re: [PATCH net-next v4 06/11] net: stmmac: resetup XPCS according to the new interface mode

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Date: Thu, 1 Feb 2024 13:10:05 +0800
From: Choong Yong Liang <yong.liang.choong@...ux.intel.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Rajneesh Bhardwaj <irenic.rajneesh@...il.com>,
 David E Box <david.e.box@...ux.intel.com>,
 Hans de Goede <hdegoede@...hat.com>, Mark Gross <markgross@...nel.org>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Jose Abreu <Jose.Abreu@...opsys.com>, "David S . Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Richard Cochran <richardcochran@...il.com>,
 Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
 Jesper Dangaard Brouer <hawk@...nel.org>,
 John Fastabend <john.fastabend@...il.com>, Andrew Lunn <andrew@...n.ch>,
 Heiner Kallweit <hkallweit1@...il.com>,
 Philipp Zabel <p.zabel@...gutronix.de>, Andrew Halaney
 <ahalaney@...hat.com>, Simon Horman <simon.horman@...igine.com>,
 Serge Semin <fancer.lancer@...il.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, platform-driver-x86@...r.kernel.org,
 linux-hwmon@...r.kernel.org, bpf@...r.kernel.org,
 Voon Wei Feng <weifeng.voon@...el.com>,
 Michael Sit Wei Hong <michael.wei.hong.sit@...el.com>,
 Lai Peter Jun Ann <jun.ann.lai@...el.com>,
 Abdul Rahim Faizal <faizal.abdul.rahim@...el.com>
Subject: Re: [PATCH net-next v4 06/11] net: stmmac: resetup XPCS according to
 the new interface mode

On 30/1/2024 6:21 pm, Russell King (Oracle) wrote:
> NAK. Absolutely not. You haven't read the phylink documentation, nor
> understood how phylink works.
> 
> Since you haven't read the phylink documentation, I'm not going to
> waste any more time reviewing this series since you haven't done your
> side of the bargin here.
> 
Hi Russell,

Sorry that previously I only studied the phylink based on the `phylink.h` 
itself. I think it might not be sufficient. I did search through the 
internet and found the phylink document from kernel.org 
(https://docs.kernel.org/networking/sfp-phylink.html). Kindly let me know 
if there are any other phylink documents I might have overlooked.

According to the phylink document from kernel.org, it does mention that 
"phylink is a mechanism to support hot-pluggable networking modules 
directly connected to a MAC without needing to re-initialise the adapter on 
hot-plug events." I realize I should not destroy and reinitialize the PCS.
Instead, I plan to follow the implementation in "net: macb: use 
mac_select_pcs() interface" 
(https://lore.kernel.org/netdev/E1n568J-002SZX-Gr@rmk-PC.armlinux.org.uk/T/). 
This involves initializing the required PCS during the MAC probe and 
querying the PCS based on the interface.

Kindly let me know if I've overlooked anything in this proposed solution.