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

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Message-ID: <23d2bbcca442457fa3efa5533b0a4246@realtek.com>
Date:   Fri, 18 Aug 2023 12:01:17 +0000
From:   Justin Lai <justinlai0215@...ltek.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "kuba@...nel.org" <kuba@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...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

Hi, Andrew

Thanks for your quick review, I will check our code again and make changes.
> 
> ---
> pw-bot: cr
>