netdev - Re: [PATCH net-next 08/10] r8169: remove rtl8169_set_speed

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Message-ID: <30dcf9f0-b5a0-1690-6964-a0afff6c3fec@gmail.com>
Date:   Mon, 2 Jul 2018 23:54:54 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     David Miller <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 08/10] r8169: remove rtl8169_set_speed_xmii

On 02.07.2018 23:21, Andrew Lunn wrote:
>> -		auto_nego |= ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM;
> 
> This bit you probably want to keep. The PHY never says it support
> Pause. The MAC needs to enable pause if the MAC supports pause.
> 
Actually I assumed that phylib would do this for me. But:
In phy_probe() first phydev->supported is copied to
phydev->advertising, and only after this both pause flags are added
to phydev->supported. Therefore I think they are not advertised.
Is this intentional? It sounds a little weird to me to add the
pause flags to the supported features per default, but not
advertise them.
Except e.g. we call by chance phy_set_max_speed(), which copies
phydev->supported to phydev->advertising after having adjusted
the supported speeds.

If this is not a bug, then where would be the right place to add
the pause flags to phydev->advertising?

>        Andrew
> 
Heiner