netdev - Re: [PATCH RFC net-next 5/5] net: dsa: always use phylink for CPU and DSA ports

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Date:   Thu, 7 Jul 2022 11:09:43 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Alvin __ipraga <alsi@...g-olufsen.dk>,
        Claudiu Manoil <claudiu.manoil@....com>,
        "David S. Miller" <davem@...emloft.net>,
        DENG Qingfang <dqfext@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        George McCollister <george.mccollister@...il.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Jakub Kicinski <kuba@...nel.org>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
        Sean Wang <sean.wang@...iatek.com>,
        UNGLinuxDriver@...rochip.com,
        Vivien Didelot <vivien.didelot@...il.com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Marek Behún <kabel@...nel.org>
Subject: Re: [PATCH RFC net-next 5/5] net: dsa: always use phylink for CPU
 and DSA ports

On Wed, Jul 06, 2022 at 05:24:09PM +0100, Russell King (Oracle) wrote:
> On Wed, Jul 06, 2022 at 01:26:21PM +0300, Vladimir Oltean wrote:
> > Can we please limit phylink_set_max_link_speed() to just the CPU ports
> > where a fixed-link property is also missing, not just a phy-handle?
> > Although to be entirely correct, we can also have MLO_AN_INBAND, which
> > wouldn't be covered by these 2 checks and would still represent a valid
> > DT binding.
> 
> phylink_set_max_fixed_link() already excludes itself:
> 
>         if (pl->cfg_link_an_mode != MLO_AN_PHY || pl->phydev || pl->sfp_bus)
>                 return -EBUSY;
> 
> intentionally so that if there is anything specified for the port, be
> that a fixed link or in-band, then phylink_set_max_fixed_link() errors
> out with -EBUSY.
> 
> The only case that it can't detect is if there is a PHY that may be
> added to phylink at a later time, and that is what the check above
> is for.

I've updated the function description to mention this detail:

+/**
+ * phylink_set_max_fixed_link() - set a fixed link configuration for phylink
+ * @pl: a pointer to a &struct phylink returned from phylink_create()
+ *
+ * Set a maximum speed fixed-link configuration for the chosen interface mode
+ * and MAC capabilities for the phylink instance if the instance has not
+ * already been configured with a SFP, fixed link, or in-band AN mode. If the
+ * interface mode is PHY_INTERFACE_MODE_NA, then search the supported
+ * interfaces bitmap for the first interface that gives the fastest supported
+ * speed.

Does this address your concern?

Thanks.

-- 
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