[RFC 2/2] virtio: enable f_in_order feature for virtio-net

[Guo Zhi <qtxuning1999@sjtu.edu.cn>]

In order feature is not a transparent feature in QEMU, only specific
devices(eg, virtio-net) support it.

Signed-off-by: Guo Zhi <qtxuning1999@sjtu.edu.cn>
---
 hw/net/virtio-net.c        | 1 +
 include/hw/virtio/virtio.h | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index c8e83921..cf0b23d8 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -719,6 +719,7 @@ static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features,
     features |= n->host_features;
 
     virtio_add_feature(&features, VIRTIO_NET_F_MAC);
+    virtio_add_feature(&features, VIRTIO_F_IN_ORDER);
 
     if (!peer_has_vnet_hdr(n)) {
         virtio_clear_feature(&features, VIRTIO_NET_F_CSUM);
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index db1c0ddf..578f22c8 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -291,7 +291,9 @@ typedef struct VirtIORNGConf VirtIORNGConf;
     DEFINE_PROP_BIT64("iommu_platform", _state, _field, \
                       VIRTIO_F_IOMMU_PLATFORM, false), \
     DEFINE_PROP_BIT64("packed", _state, _field, \
-                      VIRTIO_F_RING_PACKED, false)
+                      VIRTIO_F_RING_PACKED, false), \
+    DEFINE_PROP_BIT64("in_order", _state, _field, \
+                      VIRTIO_F_IN_ORDER, false)
 
 hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
 bool virtio_queue_enabled_legacy(VirtIODevice *vdev, int n);
-- 
2.17.1