linux-kernel - Re: [PATCH 13/15] habanalabs/gaudi: Add ethtool support using coresight

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Date:   Thu, 10 Sep 2020 22:19:51 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Oded Gabbay <oded.gabbay@...il.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        SW_Drivers@...ana.ai, gregkh@...uxfoundation.org,
        davem@...emloft.net, kuba@...nel.org,
        Omer Shpigelman <oshpigelman@...ana.ai>
Subject: Re: [PATCH 13/15] habanalabs/gaudi: Add ethtool support using
 coresight

> +static int gaudi_nic_get_link_ksettings(struct net_device *netdev,
> +					struct ethtool_link_ksettings *cmd)
> +{
> +	struct gaudi_nic_device **ptr = netdev_priv(netdev);
> +	struct gaudi_nic_device *gaudi_nic = *ptr;
> +	struct hl_device *hdev = gaudi_nic->hdev;
> +	u32 port = gaudi_nic->port, speed = gaudi_nic->speed;

Please go through the code and fixup Reverse Christmas tree.

> +
> +	cmd->base.speed = speed;
> +	cmd->base.duplex = DUPLEX_FULL;
> +
> +	ethtool_link_ksettings_zero_link_mode(cmd, supported);
> +	ethtool_link_ksettings_zero_link_mode(cmd, advertising);
> +
> +	ethtool_add_mode(cmd, supported, 100000baseCR4_Full);
> +	ethtool_add_mode(cmd, supported, 100000baseSR4_Full);
> +	ethtool_add_mode(cmd, supported, 100000baseKR4_Full);
> +	ethtool_add_mode(cmd, supported, 100000baseLR4_ER4_Full);
> +
> +	ethtool_add_mode(cmd, supported, 50000baseSR2_Full);
> +	ethtool_add_mode(cmd, supported, 50000baseCR2_Full);
> +	ethtool_add_mode(cmd, supported, 50000baseKR2_Full);
> +
> +	if (speed == SPEED_100000) {
> +		ethtool_add_mode(cmd, advertising, 100000baseCR4_Full);
> +		ethtool_add_mode(cmd, advertising, 100000baseSR4_Full);
> +		ethtool_add_mode(cmd, advertising, 100000baseKR4_Full);
> +		ethtool_add_mode(cmd, advertising, 100000baseLR4_ER4_Full);
> +
> +		cmd->base.port = PORT_FIBRE;
> +
> +		ethtool_add_mode(cmd, supported, FIBRE);
> +		ethtool_add_mode(cmd, advertising, FIBRE);
> +
> +		ethtool_add_mode(cmd, supported, Backplane);
> +		ethtool_add_mode(cmd, advertising, Backplane);
> +	} else if (speed == SPEED_50000) {
> +		ethtool_add_mode(cmd, advertising, 50000baseSR2_Full);
> +		ethtool_add_mode(cmd, advertising, 50000baseCR2_Full);
> +		ethtool_add_mode(cmd, advertising, 50000baseKR2_Full);
> +	} else {
> +		dev_err(hdev->dev, "unknown speed %d, port %d\n", speed, port);
> +		return -EFAULT;
> +	}
> +
> +	ethtool_add_mode(cmd, supported, Autoneg);
> +
> +	if (gaudi_nic->auto_neg_enable) {
> +		ethtool_add_mode(cmd, advertising, Autoneg);
> +		cmd->base.autoneg = AUTONEG_ENABLE;
> +		if (gaudi_nic->auto_neg_resolved)
> +			ethtool_add_mode(cmd, lp_advertising, Autoneg);
> +	} else {
> +		cmd->base.autoneg = AUTONEG_DISABLE;
> +	}
> +
> +	ethtool_add_mode(cmd, supported, Pause);
> +
> +	if (gaudi_nic->pfc_enable)
> +		ethtool_add_mode(cmd, advertising, Pause);
> +
> +	return 0;
> +}
> +
> +static int gaudi_nic_set_link_ksettings(struct net_device *netdev,
> +				const struct ethtool_link_ksettings *cmd)
> +{
> +	struct gaudi_nic_device **ptr = netdev_priv(netdev);
> +	struct gaudi_nic_device *gaudi_nic = *ptr;
> +	struct hl_device *hdev = gaudi_nic->hdev;
> +	u32 port = gaudi_nic->port;
> +	int rc = 0, speed = cmd->base.speed;
> +	bool auto_neg = cmd->base.autoneg == AUTONEG_ENABLE;

It appears you only support speed and auto_neg. You should check that
all other things which could be configured are empty, e.g. none of the
bits are set in cmd->link_modes.advertising. If you are requested to
configure something which is not supported, you need to return
-EOPNOTSUPP.

	Andrew