netdev - Re: [PATCH net v2] net: phy: phy_ethtool_ksettings_set: Don't discard phy_start

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Date:   Mon, 8 Nov 2021 17:09:34 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Benedikt Spranger <b.spranger@...utronix.de>
Cc:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        bage@...utronix.de, Heiner Kallweit <hkallweit1@...il.com>,
        davem@...emloft.net, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH net v2] net: phy: phy_ethtool_ksettings_set: Don't
 discard phy_start_aneg's return

On Mon, Nov 08, 2021 at 04:06:53PM +0100, Benedikt Spranger wrote:
> On Mon, 8 Nov 2021 14:25:48 +0000
> "Russell King (Oracle)" <linux@...linux.org.uk> wrote:
> 
> > On Mon, Nov 08, 2021 at 03:18:34PM +0100, bage@...utronix.de wrote:
> > > From: Bastian Germann <bage@...utronix.de>
> > > 
> > > Take the return of phy_start_aneg into account so that ethtool will
> > > handle negotiation errors and not silently accept invalid input.
> > 
> > I don't think this description is accurate. If we get to call
> > phy_start_aneg() with invalid input, then something has already
> > gone wrong.
> The MDI/MDIX/auto-MDIX settings are not checked before calling
> phy_start_aneg(). If the PHY supports forcing MDI and auto-MDIX, but
> not forcing MDIX _phy_start_aneg() returns a failure, which is silently
> ignored.

Does the broadcom driver currently do this, or is this the new
functionality you are adding?

It actually seems odd that auto and MDI is supported, but not MDIX?  I
would suggest checking with Florian about that. Which particular
broadcom PHY is it?

   Andrew