netdev - Re: [PATCH net-next v5 4/8] net/funeth: ethtool operations

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Date:   Thu, 6 Jan 2022 20:44:30 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Dimitris Michailidis <d.michailidis@...gible.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, andrew@...n.ch
Subject: Re: [PATCH net-next v5 4/8] net/funeth: ethtool operations

On Thu,  6 Jan 2022 20:36:08 -0800 Dimitris Michailidis wrote:
> +	if (netif_running(netdev))
> +		netdev->netdev_ops->ndo_stop(netdev);
> +
> +	old_tx = netdev->real_num_tx_queues;
> +	old_rx = netdev->real_num_rx_queues;
> +	set_ring_count(netdev, chan->tx_count, chan->rx_count);
> +
> +	if (netif_running(netdev)) {
> +		rc = netdev->netdev_ops->ndo_open(netdev);
> +		if (rc) {
> +			set_ring_count(netdev, old_tx, old_rx);
> +			netdev->netdev_ops->ndo_open(netdev);

Sorry, I wasn't clear - same story as with XDP - configuration changes
should not run at risk of having the machine drop off the network due
to temporary memory pressure.