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

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Date: Fri, 2 Feb 2024 11:00:58 +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 1/2/2024 4:38 pm, Russell King (Oracle) wrote:
> Note the "This must not modify any state." statement. By reinitialising
> the PCS in this method, you are violating that statement.
> 
> This requirement is because this method will be called by
> phylink_validate_mac_and_pcs() at various times, potentially for each
> and every interface that stmmac supports, which will lead to you
> reinitialising the PCS, killing the link, each time we ask the MAC for
> a PCS, whether we are going to make use of it in that mode or not.
> 
> You can not do this. Sorry. Hard NAK for this approach.
> 
Thank you for taking the time to review, got your concerns, and I'll 
address the following concerns before submitting a new patch series:

1. Remove allow_switch_interface and have the PHY driver fill in 
phydev->possible_interfaces.
2. Rework on the PCS to have similar implementation with the following 
patch "net: macb: use .mac_select_pcs() interface" 
(https://lore.kernel.org/netdev/E1n568J-002SZX-Gr@rmk-PC.armlinux.org.uk/T/).

Kindly let me know if there are any additional concerns or suggestions.