[Qemu-devel] [PATCH v4 11/11] virtio: CLI and provide packed ring feature bit by default

[wexu@redhat.com]

From: Wei Xu <wexu@redhat.com>

Add userspace and vhost kernel/user support.

Add CLI "ring_packed=true/false" to enable/disable packed ring provision.
Usage:
    -device virtio-net-pci,netdev=xx,mac=xx:xx:xx:xx:xx:xx,ring_packed=false

By default it is provided.

Signed-off-by: Wei Xu <wexu@redhat.com>
---
 hw/net/vhost_net.c         | 2 ++
 include/hw/virtio/virtio.h | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index e037db6..f593086 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -53,6 +53,7 @@ static const int kernel_feature_bits[] = {
     VIRTIO_F_VERSION_1,
     VIRTIO_NET_F_MTU,
     VIRTIO_F_IOMMU_PLATFORM,
+    VIRTIO_F_RING_PACKED,
     VHOST_INVALID_FEATURE_BIT
 };
 
@@ -78,6 +79,7 @@ static const int user_feature_bits[] = {
     VIRTIO_NET_F_MRG_RXBUF,
     VIRTIO_NET_F_MTU,
     VIRTIO_F_IOMMU_PLATFORM,
+    VIRTIO_F_RING_PACKED,
 
     /* This bit implies RARP isn't sent by QEMU out of band */
     VIRTIO_NET_F_GUEST_ANNOUNCE,
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 9c1fa07..2eb27d2 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -264,7 +264,9 @@ typedef struct VirtIORNGConf VirtIORNGConf;
     DEFINE_PROP_BIT64("any_layout", _state, _field, \
                       VIRTIO_F_ANY_LAYOUT, true), \
     DEFINE_PROP_BIT64("iommu_platform", _state, _field, \
-                      VIRTIO_F_IOMMU_PLATFORM, false)
+                      VIRTIO_F_IOMMU_PLATFORM, false), \
+    DEFINE_PROP_BIT64("ring_packed", _state, _field, \
+                      VIRTIO_F_RING_PACKED, true)
 
 hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
 hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);
-- 
1.8.3.1