diff mbox series

[v9,32/32] virtio_net: support set_ringparam

Message ID 20220406034346.74409-33-xuanzhuo@linux.alibaba.com (mailing list archive)
State Not Applicable
Headers show
Series virtio pci support VIRTIO_F_RING_RESET (refactor vring) | expand

Commit Message

Xuan Zhuo April 6, 2022, 3:43 a.m. UTC
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>
---
 drivers/net/virtio_net.c | 47 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

Comments

Jason Wang April 13, 2022, 8:06 a.m. UTC | #1
在 2022/4/6 上午11:43, Xuan Zhuo 写道:
> 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>

(One thing that I see is that, when resize fails, the param reported via 
get_ringparam might be wrong, this is a corner case but might worth to 
fix in the future).


> ---
>   drivers/net/virtio_net.c | 47 ++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 47 insertions(+)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index ba6859f305f7..37e4e27f1e4e 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -2264,6 +2264,52 @@ 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 > virtqueue_get_vring_max_size(vi->rq[0].vq))
> +		return -EINVAL;
> +
> +	if (ring->tx_pending > virtqueue_get_vring_max_size(vi->sq[0].vq))
> +		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 void virtnet_get_drvinfo(struct net_device *dev,
>   				struct ethtool_drvinfo *info)
> @@ -2497,6 +2543,7 @@ 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,
diff mbox series

Patch

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index ba6859f305f7..37e4e27f1e4e 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -2264,6 +2264,52 @@  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 > virtqueue_get_vring_max_size(vi->rq[0].vq))
+		return -EINVAL;
+
+	if (ring->tx_pending > virtqueue_get_vring_max_size(vi->sq[0].vq))
+		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 void virtnet_get_drvinfo(struct net_device *dev,
 				struct ethtool_drvinfo *info)
@@ -2497,6 +2543,7 @@  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,