[PATCH v7 26/26] virtio_net: support set_ringparam

[Jason Wang]

在 2022/3/8 下午8:35, Xuan Zhuo 写道:
> Support set_ringparam based on virtio queue reset.
>
> The rx,tx_pending required to be passed must be power of 2.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo at linux.alibaba.com>
> ---
>   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 f1bdc6ce21c3..1fa2d632a994 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -2290,6 +2290,52 @@ 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;


Any chance that we may hit this EINVAL?

Thanks


> +
> +	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_vq_reset(vi, sq, ring->tx_pending);
> +			if (err)
> +				return err;
> +		}
> +
> +		if (ring->rx_pending != rx_pending) {
> +			err = virtnet_rx_vq_reset(vi, rq, ring->rx_pending);
> +			if (err)
> +				return err;
> +		}
> +	}
> +
> +	return 0;
> +}
>   
>   static void virtnet_get_drvinfo(struct net_device *dev,
>   				struct ethtool_drvinfo *info)
> @@ -2523,6 +2569,7 @@ 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,