Linux Virtualization - May 2018 - [RFC v4 5/5] virtio_ring: enable packed ring

On 5/16/2018 11:37 AM, Tiwei Bie wrote:
> Signed-off-by: Tiwei Bie <tiwei.bie at intel.com>
> ---
>   drivers/virtio/virtio_ring.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index de3839f3621a..b158692263b0 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -1940,6 +1940,8 @@ void vring_transport_features(struct virtio_device
*vdev)
>   			break;
>   		case VIRTIO_F_IOMMU_PLATFORM:
>   			break;
> +		case VIRTIO_F_RING_PACKED:
> +			break;
    Why not just add this *case* under the previous *case*?
>    		default:
>   			/* We don't understand this bit. */
>   			__virtio_clear_bit(vdev, i);
MBR, Sergei

On Wed, May 16, 2018 at 01:15:48PM +0300, Sergei Shtylyov
wrote:
> On 5/16/2018 11:37 AM, Tiwei Bie wrote:
> 
> > Signed-off-by: Tiwei Bie <tiwei.bie at intel.com>
> > ---
> >   drivers/virtio/virtio_ring.c | 2 ++
> >   1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/virtio/virtio_ring.c
b/drivers/virtio/virtio_ring.c
> > index de3839f3621a..b158692263b0 100644
> > --- a/drivers/virtio/virtio_ring.c
> > +++ b/drivers/virtio/virtio_ring.c
> > @@ -1940,6 +1940,8 @@ void vring_transport_features(struct
virtio_device *vdev)
> >   			break;
> >   		case VIRTIO_F_IOMMU_PLATFORM:
> >   			break;
> > +		case VIRTIO_F_RING_PACKED:
> > +			break;
> 
>    Why not just add this *case* under the previous *case*?
Do you mean fallthrough? Something like:

		case VIRTIO_F_IOMMU_PLATFORM:
		case VIRTIO_F_RING_PACKED:
			break;

Best regards,
Tiwei Bie
> 
> >    		default:
> >   			/* We don't understand this bit. */
> >   			__virtio_clear_bit(vdev, i);
> 
> MBR, Sergei

On 05/16/2018 01:21 PM, Tiwei Bie wrote:
>>> Signed-off-by: Tiwei Bie <tiwei.bie at intel.com>
>>> ---
>>>   drivers/virtio/virtio_ring.c | 2 ++
>>>   1 file changed, 2 insertions(+)
>>>
>>> diff --git a/drivers/virtio/virtio_ring.c
b/drivers/virtio/virtio_ring.c
>>> index de3839f3621a..b158692263b0 100644
>>> --- a/drivers/virtio/virtio_ring.c
>>> +++ b/drivers/virtio/virtio_ring.c
>>> @@ -1940,6 +1940,8 @@ void vring_transport_features(struct
virtio_device *vdev)
>>>   			break;
>>>   		case VIRTIO_F_IOMMU_PLATFORM:
>>>   			break;
>>> +		case VIRTIO_F_RING_PACKED:
>>> +			break;
>>
>>    Why not just add this *case* under the previous *case*?
> 
> Do you mean fallthrough? Something like:
> 
> 		case VIRTIO_F_IOMMU_PLATFORM:
> 		case VIRTIO_F_RING_PACKED:
> 			break;
   Yes, exactly. :-)
> Best regards,
> Tiwei Bie
[...]

MBR, Sergei