netdev - Re: [PATCH v3 net-next 13/19] ionic: Add initial ethtool support

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Date:   Tue, 9 Jul 2019 15:34:14 -0700
From:   Shannon Nelson <snelson@...sando.io>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH v3 net-next 13/19] ionic: Add initial ethtool support

On 7/8/19 10:25 PM, Michal Kubecek wrote:
> On Mon, Jul 08, 2019 at 12:25:26PM -0700, Shannon Nelson wrote:
>> Add in the basic ethtool callbacks for device information
>> and control.
>>

>> +
>> +	if (fec_type != idev->port_info->config.fec_type) {
>> +		mutex_lock(&ionic->dev_cmd_lock);
>> +		ionic_dev_cmd_port_fec(idev, PORT_FEC_TYPE_NONE);
> The second argument should be fec_type, I believe.

Yep.

>
>> +		err = ionic_dev_cmd_wait(ionic, devcmd_timeout);
>> +		mutex_unlock(&ionic->dev_cmd_lock);
>> +		if (err)
>> +			return err;
>> +
>> +		idev->port_info->config.fec_type = fec_type;
>> +	}
>> +
>> +	return 0;
>> +}
> ...
>> +static int ionic_set_ringparam(struct net_device *netdev,
>> +			       struct ethtool_ringparam *ring)
>> +{
>> +	struct lif *lif = netdev_priv(netdev);
>> +	bool running;
>> +	int i, j;
>> +
>> +	if (ring->rx_mini_pending || ring->rx_jumbo_pending) {
>> +		netdev_info(netdev, "Changing jumbo or mini descriptors not supported\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	i = ring->tx_pending & (ring->tx_pending - 1);
>> +	j = ring->rx_pending & (ring->rx_pending - 1);
>> +	if (i || j) {
>> +		netdev_info(netdev, "Descriptor count must be a power of 2\n");
>> +		return -EINVAL;
>> +	}
> You can use is_power_of_2() here (it wouldn't allow 0 but you probably
> don't want to allow that either).

Sure.

Thanks,
sln