[v1,18/21] net/virtio-user: add new callback to enable control queue

  This patch introduces a new callback that is to be called
when the backend supports control virtqueue.

Implementation for Vhost-vDPA backend is added in this patch.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 drivers/net/virtio/virtio_user/vhost.h           |  1 +
 drivers/net/virtio/virtio_user/vhost_vdpa.c      | 15 +++++++++++++++
 drivers/net/virtio/virtio_user/virtio_user_dev.c |  3 +++
 3 files changed, 19 insertions(+)
  

> -----Original Message-----
> From: Maxime Coquelin <maxime.coquelin@redhat.com>
> Sent: Wednesday, November 30, 2022 11:57 PM
> To: dev@dpdk.org; Xia, Chenbo <chenbo.xia@intel.com>;
> david.marchand@redhat.com; eperezma@redhat.com
> Cc: Maxime Coquelin <maxime.coquelin@redhat.com>
> Subject: [PATCH v1 18/21] net/virtio-user: add new callback to enable
> control queue
> 
> This patch introduces a new callback that is to be called
> when the backend supports control virtqueue.
> 
> Implementation for Vhost-vDPA backend is added in this patch.
> 
> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
>  drivers/net/virtio/virtio_user/vhost.h           |  1 +
>  drivers/net/virtio/virtio_user/vhost_vdpa.c      | 15 +++++++++++++++
>  drivers/net/virtio/virtio_user/virtio_user_dev.c |  3 +++
>  3 files changed, 19 insertions(+)
> 
> diff --git a/drivers/net/virtio/virtio_user/vhost.h
> b/drivers/net/virtio/virtio_user/vhost.h
> index dfbf6be033..f817cab77a 100644
> --- a/drivers/net/virtio/virtio_user/vhost.h
> +++ b/drivers/net/virtio/virtio_user/vhost.h
> @@ -82,6 +82,7 @@ struct virtio_user_backend_ops {
>  	int (*get_config)(struct virtio_user_dev *dev, uint8_t *data,
> uint32_t off, uint32_t len);
>  	int (*set_config)(struct virtio_user_dev *dev, const uint8_t *data,
> uint32_t off,
>  			uint32_t len);
> +	int (*cvq_enable)(struct virtio_user_dev *dev, int enable);
>  	int (*enable_qp)(struct virtio_user_dev *dev, uint16_t pair_idx, int
> enable);
>  	int (*dma_map)(struct virtio_user_dev *dev, void *addr, uint64_t
> iova, size_t len);
>  	int (*dma_unmap)(struct virtio_user_dev *dev, void *addr, uint64_t
> iova, size_t len);
> diff --git a/drivers/net/virtio/virtio_user/vhost_vdpa.c
> b/drivers/net/virtio/virtio_user/vhost_vdpa.c
> index a0897f8dd1..3fd13d9fac 100644
> --- a/drivers/net/virtio/virtio_user/vhost_vdpa.c
> +++ b/drivers/net/virtio/virtio_user/vhost_vdpa.c
> @@ -564,6 +564,20 @@ vhost_vdpa_destroy(struct virtio_user_dev *dev)
>  	return 0;
>  }
> 
> +static int
> +vhost_vdpa_cvq_enable(struct virtio_user_dev *dev, int enable)
> +{
> +	struct vhost_vring_state state = {
> +		.index = dev->max_queue_pairs * 2,
> +		.num   = enable,
> +	};
> +
> +	if (vhost_vdpa_set_vring_enable(dev, &state))
> +		return -1;
> +
> +	return 0;
> +}
> +
>  static int
>  vhost_vdpa_enable_queue_pair(struct virtio_user_dev *dev,
>  			       uint16_t pair_idx,
> @@ -629,6 +643,7 @@ struct virtio_user_backend_ops virtio_ops_vdpa = {
>  	.set_status = vhost_vdpa_set_status,
>  	.get_config = vhost_vdpa_get_config,
>  	.set_config = vhost_vdpa_set_config,
> +	.cvq_enable = vhost_vdpa_cvq_enable,
>  	.enable_qp = vhost_vdpa_enable_queue_pair,
>  	.dma_map = vhost_vdpa_dma_map_batch,
>  	.dma_unmap = vhost_vdpa_dma_unmap_batch,
> diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c
> b/drivers/net/virtio/virtio_user/virtio_user_dev.c
> index 1a5386a3f6..b0d603ee12 100644
> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
> @@ -767,6 +767,9 @@ virtio_user_handle_mq(struct virtio_user_dev *dev,
> uint16_t q_pairs)
>  	for (i = q_pairs; i < dev->max_queue_pairs; ++i)
>  		ret |= dev->ops->enable_qp(dev, i, 0);
> 
> +	if (dev->scvq)
> +		ret |= dev->ops->cvq_enable(dev, 1);
> +
>  	dev->queue_pairs = q_pairs;
> 
>  	return ret;
> --
> 2.38.1

Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>