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virtio-net: check feature before configuring the vq coalescing command

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Virtio spec says:

	The driver MUST have negotiated the VIRTIO_NET_F_VQ_NOTF_COAL
	feature when issuing commands VIRTIO_NET_CTRL_NOTF_COAL_VQ_SET
	and VIRTIO_NET_CTRL_NOTF_COAL_VQ_GET.

So we add the feature negotiation check to
virtnet_send_{r,t}x_ctrl_coal_vq_cmd as a basis for the next bugfix patch.

Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Heng Qi <hengqi@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Heng Qi 2024-08-01 21:23:37 +08:00 committed by David S. Miller
parent 14ab4792ee
commit b50f2af9fb
1 changed files with 6 additions and 0 deletions
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6
drivers/net/virtio_net.c
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@ -3658,6 +3658,9 @@ static int virtnet_send_rx_ctrl_coal_vq_cmd(struct virtnet_info *vi,
{
int err;
if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
return -EOPNOTSUPP;
err = virtnet_send_ctrl_coal_vq_cmd(vi, rxq2vq(queue),
max_usecs, max_packets);
if (err)
@ -3675,6 +3678,9 @@ static int virtnet_send_tx_ctrl_coal_vq_cmd(struct virtnet_info *vi,
{
int err;
if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
return -EOPNOTSUPP;
err = virtnet_send_ctrl_coal_vq_cmd(vi, txq2vq(queue),
max_usecs, max_packets);
if (err)