+/* Features supported by this builtin vhost-user net driver. */
+#define VIRTIO_NET_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | \
+ (1ULL << VIRTIO_F_ANY_LAYOUT) | \
+ (1ULL << VIRTIO_NET_F_CTRL_VQ) | \
+ (1ULL << VIRTIO_NET_F_CTRL_RX) | \
+ (1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) | \
+ (1ULL << VIRTIO_NET_F_MQ) | \
+ (1ULL << VIRTIO_F_VERSION_1) | \
+ (1ULL << VHOST_F_LOG_ALL) | \
+ (1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
+ (1ULL << VIRTIO_NET_F_GSO) | \
+ (1ULL << VIRTIO_NET_F_HOST_TSO4) | \
+ (1ULL << VIRTIO_NET_F_HOST_TSO6) | \
+ (1ULL << VIRTIO_NET_F_HOST_UFO) | \
+ (1ULL << VIRTIO_NET_F_HOST_ECN) | \
+ (1ULL << VIRTIO_NET_F_CSUM) | \
+ (1ULL << VIRTIO_NET_F_GUEST_CSUM) | \
+ (1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
+ (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
+ (1ULL << VIRTIO_NET_F_GUEST_UFO) | \
+ (1ULL << VIRTIO_NET_F_GUEST_ECN) | \
+ (1ULL << VIRTIO_RING_F_INDIRECT_DESC) | \
+ (1ULL << VIRTIO_RING_F_EVENT_IDX) | \
+ (1ULL << VIRTIO_NET_F_MTU) | \
+ (1ULL << VIRTIO_F_IOMMU_PLATFORM))
+
+
+struct guest_page {
+ uint64_t guest_phys_addr;
+ uint64_t host_phys_addr;
+ uint64_t size;
+};
+
+/**
+ * function prototype for the vhost backend to handler specific vhost user
+ * messages prior to the master message handling
+ *
+ * @param vid
+ * vhost device id
+ * @param msg
+ * Message pointer.
+ * @param require_reply
+ * If the handler requires sending a reply, this varaible shall be written 1,
+ * otherwise 0.
+ * @param skip_master
+ * If the handler requires skipping the master message handling, this variable
+ * shall be written 1, otherwise 0.
+ * @return
+ * 0 on success, -1 on failure
+ */
+typedef int (*vhost_msg_pre_handle)(int vid, void *msg,
+ uint32_t *require_reply, uint32_t *skip_master);
+
+/**
+ * function prototype for the vhost backend to handler specific vhost user
+ * messages after the master message handling is done
+ *
+ * @param vid
+ * vhost device id
+ * @param msg
+ * Message pointer.
+ * @param require_reply
+ * If the handler requires sending a reply, this varaible shall be written 1,
+ * otherwise 0.
+ * @return
+ * 0 on success, -1 on failure
+ */
+typedef int (*vhost_msg_post_handle)(int vid, void *msg,
+ uint32_t *require_reply);
+
+/**
+ * pre and post vhost user message handlers
+ */
+struct vhost_user_extern_ops {
+ vhost_msg_pre_handle pre_msg_handle;
+ vhost_msg_post_handle post_msg_handle;
+};
+