linux-kernel - Re: [net-next: PATCH] net: dsa: mv88e6xxx: fix speed setting for CPU/DSA ports

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Message-ID: <CAPv3WKcxH=b01ikuUESczWeX8SJjc2fg3GjSCp7Q8p72uSt_og@mail.gmail.com>
Date:   Thu, 14 Jul 2022 19:18:57 +0200
From:   Marcin Wojtas <mw@...ihalf.com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        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>,
        Grzegorz Jaszczyk <jaz@...ihalf.com>,
        Tomasz Nowicki <tn@...ihalf.com>
Subject: Re: [net-next: PATCH] net: dsa: mv88e6xxx: fix speed setting for
 CPU/DSA ports

Hi Russell,

czw., 14 lip 2022 o 14:32 Russell King (Oracle)
<linux@...linux.org.uk> napisał(a):
>
> On Thu, Jul 14, 2022 at 03:00:21AM +0200, Marcin Wojtas wrote:
> > Commit 3c783b83bd0f ("net: dsa: mv88e6xxx: get rid of SPEED_MAX setting")
> > stopped relying on SPEED_MAX constant and hardcoded speed settings
> > for the switch ports and rely on phylink configuration.
> >
> > It turned out, however, that when the relevant code is called,
> > the mac_capabilites of CPU/DSA port remain unset.
> > mv88e6xxx_setup_port() is called via mv88e6xxx_setup() in
> > dsa_tree_setup_switches(), which precedes setting the caps in
> > phylink_get_caps down in the chain of dsa_tree_setup_ports().
> >
> > As a result the mac_capabilites are 0 and the default speed for CPU/DSA
> > port is 10M at the start. To fix that execute phylink_get_caps() callback
> > which fills port's mac_capabilities before they are processed.
> >
> > Fixes: 3c783b83bd0f ("net: dsa: mv88e6xxx: get rid of SPEED_MAX setting")
> > Signed-off-by: Marcin Wojtas <mw@...ihalf.com>
>
> Please don't merge this - the plan is to submit the RFC series I sent on
> Wednesday which deletes this code, and I'd rather not re-spin the series
> and go through the testing again because someone else changed the code.

Thank for the heads-up. Are you planning to resend the series or
willing to get it merged as-is? I have perhaps one comment, but I can
apply it later as a part of fwnode_/device_ migration.

>
> Marcin - please can you test with my RFC series, which can be found at:
>
> https://lore.kernel.org/all/Ys7RdzGgHbYiPyB1@shell.armlinux.org.uk/
>

The thing is my v2 of DSA fwnode_/device_ migration is tested and
ready to send. There will be conflicts (rather easy) with your
patchset - I volunteer to resolve it this way or another, depending on
what lands first. I have 2 platforms to test it with + also ACPI case
locally.

I'd like to make things as smooth as possible and make it before the
upcoming merge window - please share your thoughts on this.

Best regards,
Marcin