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: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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986a4f4d45
Коммит
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@ -1075,10 +1075,53 @@ static void virtnet_get_drvinfo(struct net_device *dev,
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}
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/* TODO: Eliminate OOO packets during switching */
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static int virtnet_set_channels(struct net_device *dev,
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struct ethtool_channels *channels)
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{
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struct virtnet_info *vi = netdev_priv(dev);
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u16 queue_pairs = channels->combined_count;
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int err;
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/* We don't support separate rx/tx channels.
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* We don't allow setting 'other' channels.
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*/
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if (channels->rx_count || channels->tx_count || channels->other_count)
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return -EINVAL;
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if (queue_pairs > vi->max_queue_pairs)
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return -EINVAL;
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err = virtnet_set_queues(vi, queue_pairs);
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if (!err) {
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netif_set_real_num_tx_queues(dev, queue_pairs);
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netif_set_real_num_rx_queues(dev, queue_pairs);
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virtnet_set_affinity(vi, true);
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}
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return err;
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}
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static void virtnet_get_channels(struct net_device *dev,
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struct ethtool_channels *channels)
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{
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struct virtnet_info *vi = netdev_priv(dev);
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channels->combined_count = vi->curr_queue_pairs;
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channels->max_combined = vi->max_queue_pairs;
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channels->max_other = 0;
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channels->rx_count = 0;
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channels->tx_count = 0;
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channels->other_count = 0;
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}
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static const struct ethtool_ops virtnet_ethtool_ops = {
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.get_drvinfo = virtnet_get_drvinfo,
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.get_link = ethtool_op_get_link,
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.get_ringparam = virtnet_get_ringparam,
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.set_channels = virtnet_set_channels,
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.get_channels = virtnet_get_channels,
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};
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#define MIN_MTU 68
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