linux-kernel - Re: [PATCH net] net: phy: fix save wrong speed and duplex problem if autoneg is on

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Message-ID: <20210226155603.6a1cda0b@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Fri, 26 Feb 2021 15:56:03 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Huazhong Tan <tanhuazhong@...wei.com>
Cc:     <andrew@...n.ch>, <f.fainelli@...il.com>, <hkallweit1@...il.com>,
        <davem@...emloft.net>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Guangbin Huang <huangguangbin2@...wei.com>
Subject: Re: [PATCH net] net: phy: fix save wrong speed and duplex problem
 if autoneg is on

On Fri, 26 Feb 2021 15:44:42 +0800 Huazhong Tan wrote:
> From: Guangbin Huang <huangguangbin2@...wei.com>
> 
> If phy uses generic driver and autoneg is on, enter command
> "ethtool -s eth0 speed 50" will not change phy speed actually, but
> command "ethtool eth0" shows speed is 50Mb/s because phydev->speed
> has been set to 50 and no update later.
> 
> And duplex setting has same problem too.
> 
> However, if autoneg is on, phy only changes speed and duplex according to
> phydev->advertising, but not phydev->speed and phydev->duplex. So in this
> case, phydev->speed and phydev->duplex don't need to be set in function
> phy_ethtool_ksettings_set() if autoneg is on.

Can we get a Fixes tag for this one? How far back does this behavior
date?