[dpdk-dev] [PATCH v2] vhost: support virtqueue interrupt/notification suppression

[Tiwei Bie]

Hi,

On Tue, Nov 28, 2017 at 04:48:26AM -0500, junjie.j.chen at intel.com wrote:
[...]
> @@ -195,6 +197,10 @@ struct vhost_msg {
>  
>  #define VHOST_USER_F_PROTOCOL_FEATURES	30
>  
> +#ifndef VIRTIO_F_EVENT_IDX
> + #define VIRTIO_F_EVENT_IDX 29
> +#endif
> +
>  /* Features supported by this builtin vhost-user net driver. */
>  #define VIRTIO_NET_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | \
>  				(1ULL << VIRTIO_NET_F_CTRL_VQ) | \
> @@ -212,7 +218,8 @@ struct vhost_msg {
>  				(1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
>  				(1ULL << VIRTIO_RING_F_INDIRECT_DESC) | \
>  				(1ULL << VIRTIO_NET_F_MTU) | \
> -				(1ULL << VIRTIO_F_IOMMU_PLATFORM))
> +				(1ULL << VIRTIO_F_IOMMU_PLATFORM) | \
> +				(1ULL << VIRTIO_F_EVENT_IDX))
>  

You can use VIRTIO_RING_F_EVENT_IDX directly. It has already
been defined by Linux. And you can add this new feature bit
after VIRTIO_RING_F_INDIRECT_DESC:

diff --git i/lib/librte_vhost/vhost.h w/lib/librte_vhost/vhost.h
index 2f36a034e..350ac3acc 100644
--- i/lib/librte_vhost/vhost.h
+++ w/lib/librte_vhost/vhost.h
@@ -211,6 +211,7 @@ struct vhost_msg {
 				(1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
 				(1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
 				(1ULL << VIRTIO_RING_F_INDIRECT_DESC) | \
+				(1ULL << VIRTIO_RING_F_EVENT_IDX) | \
 				(1ULL << VIRTIO_NET_F_MTU) | \
 				(1ULL << VIRTIO_F_IOMMU_PLATFORM))

Best regards,
Tiwei