>From the virtio spec:
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.
The driver must not send vq notification coalescing commands if
VIRTIO_NET_F_VQ_NOTF_COAL is not negotiated. This limitation of course
applies to vq resize.
Fixes: f61fe5f081cf ("virtio-net: fix the vq coalescing setting for vq resize")
Signed-off-by: Heng Qi <hen...@linux.alibaba.com>
Reviewed-by: Xuan Zhuo <xuanz...@linux.alibaba.com>
Acked-by: Eugenio Pé rez <epere...@redhat.com>
Acked-by: Jason Wang <jasow...@redhat.com>
---
v1->v2:
- Rephrase the subject.
- Put the feature check inside the virtnet_send_{r,t}x_ctrl_coal_vq_cmd().
drivers/net/virtio_net.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 0383a3e136d6..2b566d893ea3 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -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)
@@ -3743,7 +3749,7 @@ static int virtnet_set_ringparam(struct net_device *dev,
err = virtnet_send_tx_ctrl_coal_vq_cmd(vi, i,
vi->intr_coal_tx.max_usecs,
vi->intr_coal_tx.max_packets);
- if (err)
+ if (err && err != -EOPNOTSUPP)
return err;
}
@@ -3758,7 +3764,7 @@ static int virtnet_set_ringparam(struct net_device *dev,
vi->intr_coal_rx.max_usecs,
vi->intr_coal_rx.max_packets);
mutex_unlock(&vi->rq[i].dim_lock);
- if (err)
+ if (err && err != -EOPNOTSUPP)
return err;
}
}
--
2.32.0.3.g01195cf9f
