vhost: add vhost_get_features and vhost_ack_features

Generalize the features get/ack to be used for both vhost-net and vhost-scsi.
In vhost-net add vhost_net_get_feature_bits to select the feature bit set
depending on the NetClient kind.

Signed-off-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 29 insertions, 27 deletions

diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index a1de2f43a0..6a9a32f56b 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -46,39 +46,41 @@ struct vhost_net {
     NetClientState *nc;
 };
 
-unsigned vhost_net_get_features(struct vhost_net *net, unsigned features)
+/* Features supported by host kernel. */
+static const int kernel_feature_bits[] = {
+    VIRTIO_F_NOTIFY_ON_EMPTY,
+    VIRTIO_RING_F_INDIRECT_DESC,
+    VIRTIO_RING_F_EVENT_IDX,
+    VIRTIO_NET_F_MRG_RXBUF,
+    VHOST_INVALID_FEATURE_BIT
+};
+
+static const int *vhost_net_get_feature_bits(struct vhost_net *net)
 {
-    /* Clear features not supported by host kernel. */
-    if (!(net->dev.features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY))) {
-        features &= ~(1 << VIRTIO_F_NOTIFY_ON_EMPTY);
-    }
-    if (!(net->dev.features & (1 << VIRTIO_RING_F_INDIRECT_DESC))) {
-        features &= ~(1 << VIRTIO_RING_F_INDIRECT_DESC);
-    }
-    if (!(net->dev.features & (1 << VIRTIO_RING_F_EVENT_IDX))) {
-        features &= ~(1 << VIRTIO_RING_F_EVENT_IDX);
-    }
-    if (!(net->dev.features & (1 << VIRTIO_NET_F_MRG_RXBUF))) {
-        features &= ~(1 << VIRTIO_NET_F_MRG_RXBUF);
+    const int *feature_bits = 0;
+
+    switch (net->nc->info->type) {
+    case NET_CLIENT_OPTIONS_KIND_TAP:
+        feature_bits = kernel_feature_bits;
+        break;
+    default:
+        error_report("Feature bits not defined for this type: %d",
+                net->nc->info->type);
+        break;
     }
-    return features;
+
+    return feature_bits;
+}
+
+unsigned vhost_net_get_features(struct vhost_net *net, unsigned features)
+{
+    return vhost_get_features(&net->dev, vhost_net_get_feature_bits(net),
+            features);
 }
 
 void vhost_net_ack_features(struct vhost_net *net, unsigned features)
 {
-    net->dev.acked_features = net->dev.backend_features;
-    if (features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) {
-        net->dev.acked_features |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY);
-    }
-    if (features & (1 << VIRTIO_RING_F_INDIRECT_DESC)) {
-        net->dev.acked_features |= (1 << VIRTIO_RING_F_INDIRECT_DESC);
-    }
-    if (features & (1 << VIRTIO_RING_F_EVENT_IDX)) {
-        net->dev.acked_features |= (1 << VIRTIO_RING_F_EVENT_IDX);
-    }
-    if (features & (1 << VIRTIO_NET_F_MRG_RXBUF)) {
-        net->dev.acked_features |= (1 << VIRTIO_NET_F_MRG_RXBUF);
-    }
+    vhost_ack_features(&net->dev, vhost_net_get_feature_bits(net), features);
 }
 
 static int vhost_net_get_fd(NetClientState *backend)