linux-kernel - Re: [PATCH net-next v4 1/2] net/ethernet/realtek: Add Realtek automotive PCIe driver code

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Message-ID: <979eca15-adfe-4afc-995f-ac59f702bbd1@lunn.ch>
Date:   Thu, 17 Aug 2023 16:22:35 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Justin Lai <justinlai0215@...ltek.com>
Cc:     kuba@...nel.org, davem@...emloft.net, edumazet@...gle.com,
        pabeni@...hat.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next v4 1/2] net/ethernet/realtek: Add Realtek
 automotive PCIe driver code

 +static inline void rtase_enable_hw_interrupt(const struct rtase_private *tp)

If you read comments given to other developers, you would of seen that
inline functions are not allowed in .C files. Let the compiler decide.

> +static int rtase_get_settings(struct net_device *dev, struct ethtool_link_ksettings *cmd)
> +{
> +	const struct rtase_private *tp = netdev_priv(dev);
> +	u32 advertising = 0;
> +	u32 supported = 0;
> +	u32 speed = 0;
> +	u16 value = 0;
> +
> +	supported |= SUPPORTED_MII | SUPPORTED_Pause;
> +
> +	advertising |= ADVERTISED_MII;

You don't advertise anything, because you don't have a PHY.

> +
> +	/* speed */
> +	switch (tp->pdev->bus->cur_bus_speed) {

Speed is meant to be line side speed. That is fixed at 5G. So i would
expect a hard coded value.

> +static void rtase_get_pauseparam(struct net_device *dev, struct ethtool_pauseparam *pause)
> +{
> +	const struct rtase_private *tp = netdev_priv(dev);
> +	u16 value = RTL_R16(tp, CPLUS_CMD);
> +
> +	if ((value & (FORCE_TXFLOW_EN | FORCE_RXFLOW_EN)) == (FORCE_TXFLOW_EN | FORCE_RXFLOW_EN)) {
> +		pause->rx_pause = 1;
> +		pause->tx_pause = 1;
> +	} else if ((value & FORCE_TXFLOW_EN) != 0u) {
> +		pause->tx_pause = 1;
> +	} else if ((value & FORCE_RXFLOW_EN) != 0u) {
> +		pause->rx_pause = 1;
> +	} else {
> +		/* not enable pause */
> +	}

Probably not required, but it would be good to set pause.autoneg to
false, just to make is clear you don't support negotiating it.

> +}
> +
> +static int rtase_set_pauseparam(struct net_device *dev, struct ethtool_pauseparam *pause)
> +{
> +	const struct rtase_private *tp = netdev_priv(dev);
> +	u16 value = RTL_R16(tp, CPLUS_CMD);

Similar to above, you should return EOPNOTSUPP if pause.autoneg is
true.

> +
> +	value &= ~(FORCE_TXFLOW_EN | FORCE_RXFLOW_EN);
> +
> +	if (pause->tx_pause == 1u)
> +		value |= FORCE_TXFLOW_EN;
> +
> +	if (pause->rx_pause == 1u)

You can treat these as boolean.

> +		value |= FORCE_RXFLOW_EN;
> +
> +	RTL_W16(tp, CPLUS_CMD, value);
> +	return 0;
> +}


    Andrew

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