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virtio_net: support set_ringparam

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Support set_ringparam based on virtio queue reset.

Users can use ethtool -G eth0 <ring_num> to modify the ring size of
virtio-net.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220801063902.129329-43-xuanzhuo@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xuan Zhuo 2022-08-01 14:39:02 +08:00 committed by Michael S. Tsirkin
parent ebcce49263
commit a335b33f4f
1 changed files with 48 additions and 0 deletions
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48
drivers/net/virtio_net.c
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@ -2363,6 +2363,53 @@ static void virtnet_get_ringparam(struct net_device *dev,
ring->tx_pending = virtqueue_get_vring_size(vi->sq[0].vq);
}
static int virtnet_set_ringparam(struct net_device *dev,
struct ethtool_ringparam *ring,
struct kernel_ethtool_ringparam *kernel_ring,
struct netlink_ext_ack *extack)
{
struct virtnet_info *vi = netdev_priv(dev);
u32 rx_pending, tx_pending;
struct receive_queue *rq;
struct send_queue *sq;
int i, err;
if (ring->rx_mini_pending || ring->rx_jumbo_pending)
return -EINVAL;
rx_pending = virtqueue_get_vring_size(vi->rq[0].vq);
tx_pending = virtqueue_get_vring_size(vi->sq[0].vq);
if (ring->rx_pending == rx_pending &&
ring->tx_pending == tx_pending)
return 0;
if (ring->rx_pending > vi->rq[0].vq->num_max)
return -EINVAL;
if (ring->tx_pending > vi->sq[0].vq->num_max)
return -EINVAL;
for (i = 0; i < vi->max_queue_pairs; i++) {
rq = vi->rq + i;
sq = vi->sq + i;
if (ring->tx_pending != tx_pending) {
err = virtnet_tx_resize(vi, sq, ring->tx_pending);
if (err)
return err;
}
if (ring->rx_pending != rx_pending) {
err = virtnet_rx_resize(vi, rq, ring->rx_pending);
if (err)
return err;
}
}
return 0;
}
static bool virtnet_commit_rss_command(struct virtnet_info *vi)
{
struct net_device *dev = vi->dev;
@ -2850,6 +2897,7 @@ 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_ringparam = virtnet_set_ringparam,
.get_strings = virtnet_get_strings,
.get_sset_count = virtnet_get_sset_count,
.get_ethtool_stats = virtnet_get_ethtool_stats,