linux-kernel - Re: [PATCH net-next v3 1/2] net: dsa: microchip: ksz8: Make flow control, speed, and duplex on CPU port configurable

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Message-ID: <ZGc603g8Pjp4Umke@corigine.com>
Date:   Fri, 19 May 2023 11:01:07 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Arun Ramadoss <arun.ramadoss@...rochip.com>,
        "Russell King (Oracle)" <linux@...linux.org.uk>,
        kernel@...gutronix.de, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH net-next v3 1/2] net: dsa: microchip: ksz8: Make flow
 control, speed, and duplex on CPU port configurable

On Thu, May 18, 2023 at 11:29:12AM +0200, Oleksij Rempel wrote:
> Allow flow control, speed, and duplex settings on the CPU port to be
> configurable. Previously, the speed and duplex relied on default switch
> values, which limited flexibility. Additionally, flow control was
> hardcoded and only functional in duplex mode. This update enhances the
> configurability of these parameters.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>

Reviewed-by: Simon Horman <simon.horman@...igine.com>

...

> diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
> index f56fca1b1a22..9cfe343d2214 100644
> --- a/drivers/net/dsa/microchip/ksz8795.c
> +++ b/drivers/net/dsa/microchip/ksz8795.c
> @@ -1371,6 +1371,55 @@ void ksz8_config_cpu_port(struct dsa_switch *ds)
>  	}
>  }
>  
> +/**
> + * ksz8_upstream_link_up - Configures the CPU/upstream port of the switch.
> + * @dev: The KSZ device instance.
> + * @port: The port number to configure.
> + * @speed: The desired link speed.
> + * @duplex: The desired duplex mode.
> + * @tx_pause: If true, enables transmit pause.
> + * @rx_pause: If true, enables receive pause.
> + *
> + * Description:
> + * The function configures flow control and speed settings for the CPU/upstream
> + * port of the switch based on the desired settings, current duplex mode, and
> + * speed.
> + */
> +static void ksz8_upstream_link_up(struct ksz_device *dev, int port, int speed,
+				 int duplex, bool tx_pause, bool rx_pause)

nit: there seems to be an off-by-one error in the indentation of the line
     above.

...