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| author | Jason Wang <jasowang@redhat.com> | 2012-12-07 07:04:57 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-12-09 00:30:55 -0500 |
| commit | d73bcd2c28e3c77d9f52d42a45a52455488e287e (patch) | |
| tree | 38c315252ce27702680807107619d0aad2e60129 | |
| parent | 986a4f4d452dec004697f667439d27c3fda9c928 (diff) | |
| download | linux-d73bcd2c28e3c77d9f52d42a45a52455488e287e.tar.gz linux-d73bcd2c28e3c77d9f52d42a45a52455488e287e.tar.bz2 linux-d73bcd2c28e3c77d9f52d42a45a52455488e287e.zip | |
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>
| -rw-r--r-- | drivers/net/virtio_net.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index c0830488a390..a644eebb31d8 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -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 |