netdev - Re: [PATCH net-next v3 03/10] net: sparx5: add hostmode with phylink support

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Date:   Mon, 7 Jun 2021 14:09:24 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Steen Hegelund <steen.hegelund@...rochip.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Madalin Bucur <madalin.bucur@....nxp.com>,
        Mark Einon <mark.einon@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Simon Horman <simon.horman@...ronome.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Bjarni Jonasson <bjarni.jonasson@...rochip.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>
Subject: Re: [PATCH net-next v3 03/10] net: sparx5: add hostmode with phylink
 support

On Mon, Jun 07, 2021 at 02:45:01PM +0200, Steen Hegelund wrote:
> Hi Russell,
> 
> Thanks for your comments.
> 
> On Mon, 2021-06-07 at 10:15 +0100, Russell King (Oracle) wrote:
> > 3) I really don't get what's going on with setting the port mode to
> >    2500base-X and 1000base-X here when state->interface is 10GBASER.
> 
> The high speed interfaces (> 2.5G) do not support any in-band signalling, so the only way that e.g a
> 10G interface running at 2.5G will be able to link up with its partner is if both ends configure the
> speed manually via ethtool.

We really should not have drivers hacking around in this way. If we want
to operate in 2500base-x or 1000base-x, then that is what phylink should
be telling the MAC driver. The MAC driver should not be making these
decisions in its mac_config() callback. Doing so makes a joke of kernel
programming.

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