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Commit d73bcd2c authored by Jason Wang's avatar Jason Wang Committed by David S. Miller
Browse files

virtio-net: support changing the number of queue pairs through ethtool 



This patch implements the ethtool_{set|get}_channels method of virtio-net to
allow user to change the number of queues when the device is running on demand.

Signed-off-by: default avatarJason Wang <jasowang@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 986a4f4d

drivers/net/virtio_net.c

+43 −0
Original line number Diff line number Diff line
@@ -1075,10 +1075,53 @@ static void virtnet_get_drvinfo(struct net_device *dev, 


}



/* TODO: Eliminate OOO packets during switching */

static int virtnet_set_channels(struct net_device *dev,

				struct ethtool_channels *channels)

{

	struct virtnet_info *vi = netdev_priv(dev);

	u16 queue_pairs = channels->combined_count;

	int err;



	/* We don't support separate rx/tx channels.

	 * We don't allow setting 'other' channels.

	 */

	if (channels->rx_count || channels->tx_count || channels->other_count)

		return -EINVAL;



	if (queue_pairs > vi->max_queue_pairs)

		return -EINVAL;



	err = virtnet_set_queues(vi, queue_pairs);

	if (!err) {

		netif_set_real_num_tx_queues(dev, queue_pairs);

		netif_set_real_num_rx_queues(dev, queue_pairs);



		virtnet_set_affinity(vi, true);

	}



	return err;

}



static void virtnet_get_channels(struct net_device *dev,

				 struct ethtool_channels *channels)

{

	struct virtnet_info *vi = netdev_priv(dev);



	channels->combined_count = vi->curr_queue_pairs;

	channels->max_combined = vi->max_queue_pairs;

	channels->max_other = 0;

	channels->rx_count = 0;

	channels->tx_count = 0;

	channels->other_count = 0;

}



static const struct ethtool_ops virtnet_ethtool_ops = {

	.get_drvinfo = virtnet_get_drvinfo,

	.get_link = ethtool_op_get_link,

	.get_ringparam = virtnet_get_ringparam,

	.set_channels = virtnet_set_channels,

	.get_channels = virtnet_get_channels,

};



#define MIN_MTU 68