netdev - Re: [PATCH v4 net-next 13/19] ionic: Add initial ethtool support

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Date:   Thu, 25 Jul 2019 15:28:45 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Shannon Nelson <snelson@...sando.io>
Cc:     netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH v4 net-next 13/19] ionic: Add initial ethtool support

On Mon, Jul 22, 2019 at 02:40:17PM -0700, Shannon Nelson wrote:

> +static void ionic_get_pauseparam(struct net_device *netdev,
> +				 struct ethtool_pauseparam *pause)
> +{
> +	struct lif *lif = netdev_priv(netdev);
> +	struct ionic_dev *idev = &lif->ionic->idev;
> +	uint8_t pause_type = idev->port_info->config.pause_type;
> +
> +	pause->autoneg = 0;
> +
> +	if (pause_type) {
> +		pause->rx_pause = pause_type & IONIC_PAUSE_F_RX ? 1 : 0;
> +		pause->tx_pause = pause_type & IONIC_PAUSE_F_TX ? 1 : 0;
> +	}
> +}
> +
> +static int ionic_set_pauseparam(struct net_device *netdev,
> +				struct ethtool_pauseparam *pause)
> +{
> +	struct lif *lif = netdev_priv(netdev);
> +	struct ionic *ionic = lif->ionic;
> +	struct ionic_dev *idev = &lif->ionic->idev;
> +	u32 requested_pause;
> +	int err;
> +
> +	if (pause->autoneg == AUTONEG_ENABLE) {
> +		netdev_info(netdev, "Please use 'ethtool -s ...' to change autoneg\n");
> +		return -EOPNOTSUPP;
> +	}
> +
> +	/* change both at the same time */
> +	requested_pause = PORT_PAUSE_TYPE_LINK;
> +	if (pause->rx_pause)
> +		requested_pause |= IONIC_PAUSE_F_RX;
> +	if (pause->tx_pause)
> +		requested_pause |= IONIC_PAUSE_F_TX;

Hi Shannon

This not what i was expecting, and i'm guessing what you have here is
not right.

So you don't support the case of pause->autoneg ==
AUTONEG_ENABLE. That implies that setting pause values directly
configures the MAC. The values from auto-neg are always ignored. Then
why did you set PAUSE in the get ksettings function?

If you always ignore the values from auto-neg, then your info message
also makes no sense.

What really does the firmware do?

     Andrew