[2/8] vring: make vring_enable_notification return void

Make the API more similar to the regular virtqueue API.  This will
help when modifying the code to not use vring.c anymore.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/block/dataplane/virtio-blk.c     | 3 ++-
 hw/virtio/dataplane/vring.c         | 3 +--
 include/hw/virtio/dataplane/vring.h | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

On Sun, 14 Feb 2016 18:17:05 +0100
Paolo Bonzini <pbonzini@redhat.com> wrote:

> Make the API more similar to the regular virtqueue API.  This will
> help when modifying the code to not use vring.c anymore.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  hw/block/dataplane/virtio-blk.c     | 3 ++-
>  hw/virtio/dataplane/vring.c         | 3 +--
>  include/hw/virtio/dataplane/vring.h | 2 +-
>  3 files changed, 4 insertions(+), 4 deletions(-)
> 

> diff --git a/hw/virtio/dataplane/vring.c b/hw/virtio/dataplane/vring.c
> index 4308d9f..157e8b8 100644
> --- a/hw/virtio/dataplane/vring.c
> +++ b/hw/virtio/dataplane/vring.c
> @@ -175,7 +175,7 @@ void vring_disable_notification(VirtIODevice *vdev, Vring *vring)
>   *
>   * Return true if the vring is empty, false if there are more requests.
>   */

I realize that this is going away, but the comment above is now a bit
irritating :)

> -bool vring_enable_notification(VirtIODevice *vdev, Vring *vring)
> +void vring_enable_notification(VirtIODevice *vdev, Vring *vring)
>  {
>      if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
>          vring_avail_event(&vring->vr) = vring->vr.avail->idx;
> @@ -183,7 +183,6 @@ bool vring_enable_notification(VirtIODevice *vdev, Vring *vring)
>          vring_clear_used_flags(vdev, vring, VRING_USED_F_NO_NOTIFY);
>      }
>      smp_mb(); /* ensure update is seen before reading avail_idx */
> -    return !vring_more_avail(vdev, vring);
>  }
> 
>  /* This is stolen from linux/drivers/vhost/vhost.c:vhost_notify() */

Otherwise

Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>

On Sun, 02/14 18:17, Paolo Bonzini wrote:
> Make the API more similar to the regular virtqueue API.  This will
> help when modifying the code to not use vring.c anymore.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  hw/block/dataplane/virtio-blk.c     | 3 ++-
>  hw/virtio/dataplane/vring.c         | 3 +--
>  include/hw/virtio/dataplane/vring.h | 2 +-
>  3 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/block/dataplane/virtio-blk.c b/hw/block/dataplane/virtio-blk.c
> index 0d99781..03b81bc 100644
> --- a/hw/block/dataplane/virtio-blk.c
> +++ b/hw/block/dataplane/virtio-blk.c
> @@ -128,7 +128,8 @@ static void handle_notify(EventNotifier *e)
>              /* Re-enable guest->host notifies and stop processing the vring.
>               * But if the guest has snuck in more descriptors, keep processing.
>               */
> -            if (vring_enable_notification(s->vdev, &s->vring)) {
> +            vring_enable_notification(s->vdev, &s->vring);
> +            if (!vring_more_avail(s->vdev, &s->vring)) {
>                  break;
>              }
>          } else { /* fatal error */
> diff --git a/hw/virtio/dataplane/vring.c b/hw/virtio/dataplane/vring.c
> index 4308d9f..157e8b8 100644
> --- a/hw/virtio/dataplane/vring.c
> +++ b/hw/virtio/dataplane/vring.c
> @@ -175,7 +175,7 @@ void vring_disable_notification(VirtIODevice *vdev, Vring *vring)
>   *
>   * Return true if the vring is empty, false if there are more requests.
>   */
> -bool vring_enable_notification(VirtIODevice *vdev, Vring *vring)
> +void vring_enable_notification(VirtIODevice *vdev, Vring *vring)
>  {
>      if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
>          vring_avail_event(&vring->vr) = vring->vr.avail->idx;
> @@ -183,7 +183,6 @@ bool vring_enable_notification(VirtIODevice *vdev, Vring *vring)
>          vring_clear_used_flags(vdev, vring, VRING_USED_F_NO_NOTIFY);
>      }
>      smp_mb(); /* ensure update is seen before reading avail_idx */
> -    return !vring_more_avail(vdev, vring);
>  }
>  
>  /* This is stolen from linux/drivers/vhost/vhost.c:vhost_notify() */
> diff --git a/include/hw/virtio/dataplane/vring.h b/include/hw/virtio/dataplane/vring.h
> index e80985e..e1c2a65 100644
> --- a/include/hw/virtio/dataplane/vring.h
> +++ b/include/hw/virtio/dataplane/vring.h
> @@ -42,7 +42,7 @@ static inline void vring_set_broken(Vring *vring)
>  bool vring_setup(Vring *vring, VirtIODevice *vdev, int n);
>  void vring_teardown(Vring *vring, VirtIODevice *vdev, int n);
>  void vring_disable_notification(VirtIODevice *vdev, Vring *vring);
> -bool vring_enable_notification(VirtIODevice *vdev, Vring *vring);
> +void vring_enable_notification(VirtIODevice *vdev, Vring *vring);
>  bool vring_should_notify(VirtIODevice *vdev, Vring *vring);
>  void *vring_pop(VirtIODevice *vdev, Vring *vring, size_t sz);
>  void vring_push(VirtIODevice *vdev, Vring *vring, VirtQueueElement *elem,
> -- 
> 1.8.3.1
> 
> 
> 

Reviewed-by: Fam Zheng <famz@redhat.com>