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

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Message-ID: <YtAMw7Sp06Kiv9PK@shell.armlinux.org.uk>
Date:   Thu, 14 Jul 2022 13:32:03 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Marcin Wojtas <mw@...ihalf.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        olteanv@...il.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, jaz@...ihalf.com,
        tn@...ihalf.com
Subject: Re: [net-next: PATCH] net: dsa: mv88e6xxx: fix speed setting for
 CPU/DSA ports

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.

Marcin - please can you test with my RFC series, which can be found at:

https://lore.kernel.org/all/Ys7RdzGgHbYiPyB1@shell.armlinux.org.uk/

Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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