netdev - Re: [PATCH net-next v11 04/10] netdev: cavium: octeon: Add Octeon III BGX Ports

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Date:   Tue, 5 Jun 2018 02:55:09 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     "Steven J. Hill" <steven.hill@...ium.com>
Cc:     netdev@...r.kernel.org, Carlos Munoz <cmunoz@...ium.com>
Subject: Re: [PATCH net-next v11 04/10] netdev: cavium: octeon: Add Octeon
 III BGX Ports

> +	if (status.link) {
> +		/* Always full duplex */
> +		status.duplex = DUPLEX_FULL;
> +
> +		/* Speed */
> +		speed = bgx_port_get_qlm_speed(priv, priv->qlm);
> +		data = oct_csr_read(BGX_CMR_CONFIG(priv->node, priv->bgx,
> +						   priv->index));
> +		switch ((data >> 8) & 7) {
> +		default:
> +		case 1:
> +			speed = (speed * 8 + 5) / 10;
> +			lanes = 4;
> +			break;

Hi Steven

Here you add 5, which you did not in the other function dealing with
speed...

> +		priv->phydev = of_phy_connect(netdev, priv->phy_np,
> +					      bgx_port_adjust_link, 0,
> +					      PHY_INTERFACE_MODE_SGMII);
> +		if (!priv->phydev)
> +			return -ENODEV;
> +
> +		netif_carrier_off(netdev);
> +
> +		if (priv->phydev)
> +			phy_start_aneg(priv->phydev);
> +	}

If you are using phylib, you should not need to make calls to
netif_carrier_*(). The phylib will do it for you.

Why hard code passing PHY_INTERFACE_MODE_SGMII? You also support
RGMII? It would be better to use of_get_phy_mode().

> +int bgx_port_change_mtu(struct net_device *netdev, int new_mtu)
> +{
> +	struct bgx_port_priv *priv = bgx_port_netdev2priv(netdev);
> +	int max_frame;
> +
> +	if (new_mtu < 60 || new_mtu > 65392) {
> +		netdev_warn(netdev, "Maximum MTU supported is 65392\n");
> +		return -EINVAL;
> +	}

The core can check this for you, if you tell it the MAX and Min.

    Andrew