On Wed, Jul 31, 2024 at 08:07:17PM +0800, Heng Qi wrote:
> >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;
> }
>
So far so good.
> @@ -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;
> }
> }
I don't get this one. If resize is not supported, we pretend it
was successful? Why?
> --
> 2.32.0.3.g01195cf9f
