netdev - Re: [PATCH net 2/7] net: dsa: mt7530: fix phylink for port 5 and fix port 5 modes

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Date:   Mon, 27 Mar 2023 21:49:44 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     arinc9.unal@...il.com
Cc:     Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Russell King <linux@...linux.org.uk>,
        René van Dorst <opensource@...rst.com>,
        Arınç ÜNAL <arinc.unal@...nc9.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>,
        Richard van Schagen <richard@...terhints.com>,
        Richard van Schagen <vschagen@...com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        erkin.bozoglu@...ont.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net 2/7] net: dsa: mt7530: fix phylink for port 5 and fix
 port 5 modes

On Sun, Mar 26, 2023 at 05:08:13PM +0300, arinc9.unal@...il.com wrote:
> From: Arınç ÜNAL <arinc.unal@...nc9.com>
> 
> There're two call paths for setting up port 5:
> 
> mt7530_setup()
> -> mt7530_setup_port5()
> 
> mt753x_phylink_mac_config()
> -> mt753x_mac_config()
>    -> mt7530_mac_config()
>       -> mt7530_setup_port5()
> 
> The first call path is supposed to run when phy muxing is being used. In
> this case, port 5 is somewhat of a hidden port. It won't be defined on the
> devicetree so phylink can't be used to manage the port.
> 
> The second call path used to call mt7530_setup_port5() directly under case
> 5 on mt7530_phylink_mac_config() before it was moved to mt7530_mac_config()
> with 88bdef8be9f6 ("net: dsa: mt7530: Extend device data ready for adding a
> new hardware"). mt7530_setup_port5() will never run through this call path
> because the current code on mt7530_setup() bypasses phylink for all cases
> of port 5.
> 
> Leave it to phylink if port 5 is used as a CPU port or a user port. For the
> cases of phy muxing or the port being disabled, call mt7530_setup_port5()
> directly from mt7530_setup_port5() without involving phylink.

You probably don't mean "call X() from X()" (that would make it recursive),
but maybe from mt7530_setup(). But it was already called from mt7530_setup(),
so I don't understand what is being transmitted here...

> 
> Move setting the interface and P5_DISABLED mode to a more specific
> location. They're supposed to be overwritten if phy muxing is detected.
> 
> Add comments which explain the process.
> 
> Fixes: 38f790a80560 ("net: dsa: mt7530: Add support for port 5")
> Tested-by: Arınç ÜNAL <arinc.unal@...nc9.com>
> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
> ---

Sorry, I didn't understand... so what was the problem, and how does the
movement of the mt7530_setup_port5() call that isn't under phylink solve
that problem?