[v2,4/5] vhost: notify virtq file descriptor update

  When virtq call or kick file descriptors are changed in the device
configuration when the queue is ready, the application and the vDPA
driver should be notified to be aligned to the new file descriptors.

Notify the state to be disabled before the file descriptor update and
return it back to be enabled after the update.

Signed-off-by: Matan Azrad <matan@mellanox.com>
---
 lib/librte_vhost/vhost_user.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
  

On 6/25/20 3:38 PM, Matan Azrad wrote:
> When virtq call or kick file descriptors are changed in the device
> configuration when the queue is ready, the application and the vDPA
> driver should be notified to be aligned to the new file descriptors.
> 
> Notify the state to be disabled before the file descriptor update and
> return it back to be enabled after the update.
> 
> Signed-off-by: Matan Azrad <matan@mellanox.com>
> ---
>  lib/librte_vhost/vhost_user.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
> index f690fdb..f3966b6 100644
> --- a/lib/librte_vhost/vhost_user.c
> +++ b/lib/librte_vhost/vhost_user.c
> @@ -1624,6 +1624,12 @@
>  		"vring call idx:%d file:%d\n", file.index, file.fd);
>  
>  	vq = dev->virtqueue[file.index];
> +
> +	if (vq->ready) {
> +		vhost_user_notify_queue_state(dev, file.index, 0);
> +		vq->ready = 0;
> +	}
> +
>  	if (vq->callfd >= 0)
>  		close(vq->callfd);
>  
> @@ -1882,6 +1888,11 @@ static int vhost_user_set_vring_err(struct virtio_net **pdev __rte_unused,
>  				dev->vid, file.index, 1);
>  	}
>  
> +	if (vq->ready) {
> +		vhost_user_notify_queue_state(dev, file.index, 0);
> +		vq->ready = 0;
> +	}
> +
>  	if (vq->kickfd >= 0)
>  		close(vq->kickfd);
>  	vq->kickfd = file.fd;
> 

Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime
  

> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Matan Azrad
> Sent: Thursday, June 25, 2020 9:38 PM
> To: Maxime Coquelin <maxime.coquelin@redhat.com>
> Cc: dev@dpdk.org; Wang, Xiao W <xiao.w.wang@intel.com>
> Subject: [dpdk-dev] [PATCH v2 4/5] vhost: notify virtq file descriptor update
> 
> When virtq call or kick file descriptors are changed in the device configuration
> when the queue is ready, the application and the vDPA driver should be notified
> to be aligned to the new file descriptors.
> 
> Notify the state to be disabled before the file descriptor update and return it
> back to be enabled after the update.
> 
> Signed-off-by: Matan Azrad <matan@mellanox.com>
> ---
>  lib/librte_vhost/vhost_user.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c index
> f690fdb..f3966b6 100644
> --- a/lib/librte_vhost/vhost_user.c
> +++ b/lib/librte_vhost/vhost_user.c
> @@ -1624,6 +1624,12 @@
>  		"vring call idx:%d file:%d\n", file.index, file.fd);
> 
>  	vq = dev->virtqueue[file.index];
> +
> +	if (vq->ready) {
> +		vhost_user_notify_queue_state(dev, file.index, 0);
> +		vq->ready = 0;
> +	}
> +
>  	if (vq->callfd >= 0)
>  		close(vq->callfd);
> 
> @@ -1882,6 +1888,11 @@ static int vhost_user_set_vring_err(struct virtio_net
> **pdev __rte_unused,
>  				dev->vid, file.index, 1);
>  	}
> 
> +	if (vq->ready) {
> +		vhost_user_notify_queue_state(dev, file.index, 0);
> +		vq->ready = 0;
> +	}
> +
>  	if (vq->kickfd >= 0)
>  		close(vq->kickfd);
>  	vq->kickfd = file.fd;
> --
> 1.8.3.1

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