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>
{
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)
{
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)