Re: [dpdk-dev] [PATCH 11/15] net/virtio: add vDPA op to stop and close the device

[Tiwei Bie <tiwei.bie@intel.com>]

On Thu, Aug 29, 2019 at 09:59:56AM +0200, Maxime Coquelin wrote:
> This patch implements the vDPA .dev_close() callback.
> 
> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
>  drivers/net/virtio/virtio_vdpa.c | 52 ++++++++++++++++++++++++++++++++
>  1 file changed, 52 insertions(+)
> 
> diff --git a/drivers/net/virtio/virtio_vdpa.c b/drivers/net/virtio/virtio_vdpa.c
> index 13b4dd07d..691844906 100644
> --- a/drivers/net/virtio/virtio_vdpa.c
> +++ b/drivers/net/virtio/virtio_vdpa.c
> @@ -436,6 +436,33 @@ virtio_vdpa_start(struct virtio_vdpa_device *dev)
>  	return ret;
>  }
>  
> +static void
> +virtio_vdpa_stop(struct virtio_vdpa_device *dev)
> +{
> +	struct virtio_hw *hw = &dev->hw;
> +	uint32_t i, nr_vring;
> +	int vid = dev->vid;
> +	struct rte_vhost_vring vr;
> +	uint16_t last_used_idx, last_avail_idx;
> +
> +	nr_vring = rte_vhost_get_vring_num(vid);
> +
> +	vtpci_reset(hw);
> +
> +	for (i = 0; i < nr_vring; i++) {
> +		rte_vhost_get_vhost_vring(vid, i, &vr);
> +
> +		last_used_idx = vr.used->idx;
> +		last_avail_idx = vr.avail->idx;

This only works in split ring.

Regards,
Tiwei

> +
> +		rte_vhost_set_vring_base(vid, i, last_avail_idx,
> +				last_used_idx);
> +	}
> +
> +	rte_free(dev->vqs);
> +	dev->vqs = NULL;
> +}
> +