netdev - RE: [PATCH net-next v4] Add Mellanox BlueField Gigabit Ethernet driver

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Date:   Tue, 16 Mar 2021 23:16:40 +0000
From:   David Thompson <davthompson@...dia.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        Liming Sun <limings@...dia.com>,
        Asmaa Mnebhi <asmaa@...dia.com>
Subject: RE: [PATCH net-next v4] Add Mellanox BlueField Gigabit Ethernet
 driver



> -----Original Message-----
> From: Andrew Lunn <andrew@...n.ch>
> Sent: Thursday, March 11, 2021 8:57 PM
> To: David Thompson <davthompson@...dia.com>
> Cc: netdev@...r.kernel.org; davem@...emloft.net; kuba@...nel.org; Liming
> Sun <limings@...dia.com>; Asmaa Mnebhi <asmaa@...dia.com>
> Subject: Re: [PATCH net-next v4] Add Mellanox BlueField Gigabit Ethernet driver
> 
> > +static void mlxbf_gige_get_pauseparam(struct net_device *netdev,
> > +				      struct ethtool_pauseparam *pause) {
> > +	struct mlxbf_gige *priv = netdev_priv(netdev);
> > +
> > +	pause->autoneg = priv->aneg_pause;
> > +	pause->rx_pause = priv->tx_pause;
> > +	pause->tx_pause = priv->rx_pause;
> > +}
> 
> > +static int mlxbf_gige_probe(struct platform_device *pdev) {
> > +	err = phy_connect_direct(netdev, phydev,
> > +				 mlxbf_gige_adjust_link,
> > +				 PHY_INTERFACE_MODE_GMII);
> > +	if (err) {
> > +		dev_err(&pdev->dev, "Could not attach to PHY\n");
> > +		mlxbf_gige_mdio_remove(priv);
> > +		return err;
> > +	}
> > +
> > +	/* MAC only supports 1000T full duplex mode */
> > +	phy_remove_link_mode(phydev,
> ETHTOOL_LINK_MODE_1000baseT_Half_BIT);
> > +	phy_remove_link_mode(phydev,
> ETHTOOL_LINK_MODE_100baseT_Full_BIT);
> > +	phy_remove_link_mode(phydev,
> ETHTOOL_LINK_MODE_100baseT_Half_BIT);
> > +	phy_remove_link_mode(phydev,
> ETHTOOL_LINK_MODE_10baseT_Full_BIT);
> > +	phy_remove_link_mode(phydev,
> ETHTOOL_LINK_MODE_10baseT_Half_BIT);
> > +
> > +	/* MAC supports symmetric flow control */
> > +	phy_support_sym_pause(phydev);
> > +
> > +	/* Enable pause */
> > +	priv->rx_pause = phydev->pause;
> > +	priv->tx_pause = phydev->pause;
> > +	priv->aneg_pause = AUTONEG_ENABLE;
> 
> Hi David
> 
> I'm pretty sure mlxbf_gige_get_pauseparam() is broken.
> 
> This is the only code which sets priv->rx_pause, etc. And this is before the PHY
> has had time to do anything. auto-neg has not completed so you have no idea
> what has been negotiated for pause.
> mlxbf_gige_adjust_link() should be adjusting priv->??_pause once the link has
> been established.
> 
>      Andrew

Yes, good point Andrew.  I will modify mlxbf_gige_adjust_link() to set the
private pause parameters after the "link up" event.

- Dave