netdev - Re: [PATCH v1] ethtool: provide UAPI for PHY master/slave configuration.

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Message-ID: <20200415131104.GA657811@lunn.ch>
Date:   Wed, 15 Apr 2020 15:11:04 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Michal Kubecek <mkubecek@...e.cz>,
        David Jander <david@...tonic.nl>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Russell King <linux@...linux.org.uk>, mkl@...gutronix.de
Subject: Re: [PATCH v1] ethtool: provide UAPI for PHY master/slave
 configuration.

On Wed, Apr 15, 2020 at 02:12:09PM +0200, Oleksij Rempel wrote:
> This UAPI is needed for BroadR-Reach 100BASE-T1 devices. Due to lack of
> auto-negotiation support, we needed to be able to configure the
> MASTER-SLAVE role of the port manually or from an application in user
> space.

Hi Oleksij

This is a nice way to do this.

> +/* Port mode */
> +#define PORT_MODE_MASTER	0x00
> +#define PORT_MODE_SLAVE		0x01
> +#define PORT_MODE_MASTER_FORCE	0x02
> +#define PORT_MODE_SLAVE_FORCE	0x03
> +#define PORT_MODE_UNKNOWN	0xff

It is not clear to me what PORT_MODE_MASTER and PORT_MODE_SLAVE. Do
these mean to negotiate master/slave? Maybe some comments, or clearer
names?

	Andrew