netdev - Re: [RFC PATCH net-next 08/22] net: dsa: mt7530: change p{5,6}_interface to p{5,6}

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Date:   Fri, 21 Apr 2023 21:20:30 +0300
From:   Arınç ÜNAL <arinc.unal@...nc9.com>
To:     Daniel Golle <daniel@...rotopia.org>
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>,
        Vladimir Oltean <olteanv@...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>,
        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: [RFC PATCH net-next 08/22] net: dsa: mt7530: change
 p{5,6}_interface to p{5,6}_configured

On 21.04.2023 21:17, Arınç ÜNAL wrote:
> On 21.04.2023 20:28, Daniel Golle wrote:
>> On Fri, Apr 21, 2023 at 05:36:34PM +0300, arinc9.unal@...il.com wrote:
>>> From: Arınç ÜNAL <arinc.unal@...nc9.com>
>>>
>>> The idea of p5_interface and p6_interface pointers is to prevent
>>> mt753x_mac_config() from running twice for MT7531, as it's already 
>>> run with
>>> mt753x_cpu_port_enable() from mt7531_setup_common(), if the port is 
>>> used as
>>> a CPU port.
>>>
>>> Change p5_interface and p6_interface to p5_configured and p6_configured.
>>> Make them boolean.
>>>
>>> Do not set them for any other reason.
>>>
>>> The priv->p5_intf_sel check is useless as in this code path, it will 
>>> always
>>> be P5_INTF_SEL_GMAC5.
>>>
>>> There was also no need to set priv->p5_interface and 
>>> priv->p6_interface to
>>> PHY_INTERFACE_MODE_NA on mt7530_setup() and mt7531_setup() as they would
>>> already be set to that when "priv" is allocated. The pointers were of 
>>> the
>>> phy_interface_t enumeration type, and the first element of the enum is
>>> PHY_INTERFACE_MODE_NA. There was nothing in between that would change 
>>> this
>>> beforehand.
>>>
>>> Tested-by: Arınç ÜNAL <arinc.unal@...nc9.com>
>>> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
>>
>> NACK. This assumes that a user port is configured exactly once.
>> However, interface mode may change because of mode-changing PHYs (e.g.
>> often using Cisco SGMII for 10M/100M/1000M but using 2500Base-X for
>> 2500M, ie. depending on actual link speed).
>>
>> Also when using SFP modules (which can be hotplugged) the interface
>> mode may change after initially setting up the driver, e.g. when SFP
>> driver is loaded or a module is plugged or replaced.
> 
> I'm not sure I understand. pX_configured would be set to true only when 
> the port is used as a CPU port. mt753x_mac_config() should run for user 
> or DSA ports more than once, if needed.

Looking at this again, once pX_interface is true, the check will prevent 
even user or DSA ports to be configured again. What about setting 
pX_interface to false after mt753x_mac_config() is run?

Arınç