linux-kernel - Re: [PATCH v2] net: phy: Prevent reporting advertised modes when autoneg is off

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Message-ID: <dleftjzh4m3qtp.fsf%l.stelmach@samsung.com>
Date:   Fri, 16 Oct 2020 21:37:22 +0200
From:   Lukasz Stelmach <l.stelmach@...sung.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bartłomiej Żolnierkiewicz 
        <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH v2] net: phy: Prevent reporting advertised modes when
 autoneg is off

It was <2020-10-16 pią 20:09>, when Andrew Lunn wrote:
> On Thu, Oct 15, 2020 at 10:44:35AM +0200, Łukasz Stelmach wrote:
>> Do not report advertised link modes (local and remote) when
>> autonegotiation is turned off. mii_ethtool_get_link_ksettings() exhibits
>> the same behaviour and this patch aims at unifying the behavior of both
>> functions.
>
> Does ethtool allow you to configure advertised modes with autoneg off?
> If it can, it would be useful to see what is being configured, before
> it is actually turned on.
>
> ethtool -s eth42 autoneg off advertise 0xf
>
> does not give an error on an interface i have.

Yes, this is a good point. Do you think I should change the if()[1] in 
mii_ethtool_get_link_ksettings() instead? I really think these two
function should report the same.

[1] https://elixir.bootlin.com/linux/v5.9/source/drivers/net/mii.c#L174
[2] https://elixir.bootlin.com/linux/v5.9/source/drivers/net/mii.c#L145

Kind regards,
-- 
Łukasz Stelmach
Samsung R&D Institute Poland
Samsung Electronics

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