[dpdk-dev,RFC,5/7] lib/librte_vhost: Add a vhost session abstraction

diff --git a/lib/librte_vhost/rte_virtio_net.h b/lib/librte_vhost/rte_virtio_net.h
index a36c0e3..a9e20ea 100644
--- a/lib/librte_vhost/rte_virtio_net.h
+++ b/lib/librte_vhost/rte_virtio_net.h
@@ -85,7 +85,7 @@  struct vhost_driver {
 	vhost_driver_type_t	type;		/**< driver type. */
 	const char		*dev_name;	/**< accessing device name. */
 	union {
-		struct fuse_session *session;	/**< fuse session. */
+		struct fuse_session *cuse_session;	/**< fuse session. */
 	};
 };
 
diff --git a/lib/librte_vhost/vhost-net-cdev.c b/lib/librte_vhost/vhost-net-cdev.c
index 090c6fc..6754548 100644
--- a/lib/librte_vhost/vhost-net-cdev.c
+++ b/lib/librte_vhost/vhost-net-cdev.c
@@ -67,7 +67,7 @@  fuse_req_to_vhost_ctx(fuse_req_t req, struct fuse_file_info *fi)
 	struct fuse_ctx const *const req_ctx = fuse_req_ctx(req);
 
 	ctx.type = VHOST_DRV_CUSE;
-	ctx.pid = req_ctx->pid;
+	ctx.cdev.pid = req_ctx->pid;
 	ctx.fh = fi->fh;
 
 	return ctx;
@@ -345,9 +345,9 @@  vhost_cuse_driver_register(struct vhost_driver *drv)
 
 	ops = get_virtio_net_callbacks(drv->type);
 
-	drv->session = cuse_lowlevel_setup(3, fuse_argv,
+	drv->cuse_session = cuse_lowlevel_setup(3, fuse_argv,
 				&cuse_info, &vhost_net_ops, 0, NULL);
-	if (drv->session == NULL)
+	if (drv->cuse_session == NULL)
 		return -1;
 
 	return 0;
@@ -359,7 +359,7 @@  vhost_cuse_driver_register(struct vhost_driver *drv)
 static int
 vhost_cuse_driver_session_start(struct vhost_driver *drv)
 {
-	fuse_session_loop(drv->session);
+	fuse_session_loop(drv->cuse_session);
 
 	return 0;
 }
diff --git a/lib/librte_vhost/vhost-net.h b/lib/librte_vhost/vhost-net.h
index 64873d0..ef04832 100644
--- a/lib/librte_vhost/vhost-net.h
+++ b/lib/librte_vhost/vhost-net.h
@@ -72,14 +72,19 @@ 
 #define PRINT_PACKET(device, addr, size, header) do {} while (0)
 #endif
 
+struct vhost_device_cuse_ctx {
+	pid_t   pid;	/* PID of process calling the IOCTL. */
+};
 
 /*
  * Structure used to identify device context.
  */
 struct vhost_device_ctx {
 	vhost_driver_type_t	type;	/* driver type. */
-	pid_t			pid;	/* PID of process calling the IOCTL. */
 	uint64_t		fh;	/* Populated with fi->fh to track the device index. */
+	union {
+		struct vhost_device_cuse_ctx cdev;
+	};
 };
 
 /*
diff --git a/lib/librte_vhost/virtio-net-cdev.c b/lib/librte_vhost/virtio-net-cdev.c
index 70bc578..ac97551 100644
--- a/lib/librte_vhost/virtio-net-cdev.c
+++ b/lib/librte_vhost/virtio-net-cdev.c
@@ -412,7 +412,8 @@  cuse_set_mem_table(struct vhost_device_ctx ctx, const void *mem_regions_addr,
 		if (mem->regions[regionidx].guest_phys_address == 0x0) {
 			mem->base_address = mem->regions[regionidx].userspace_address;
 			/* Map VM memory file */
-			if (cdev_host_memory_map(dev, mem, ctx.pid, mem->base_address) != 0) {
+			if (cdev_host_memory_map(dev, mem, ctx.cdev.pid,
+						mem->base_address) != 0) {
 				free(mem);
 				return -1;
 			}
@@ -543,7 +544,7 @@  cuse_set_vring_call(struct vhost_device_ctx ctx, struct vhost_vring_file *file)
 	vq->kickfd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
 	eventfd_kick.source_fd = vq->kickfd;
 	eventfd_kick.target_fd = file->fd;
-	eventfd_kick.target_pid = ctx.pid;
+	eventfd_kick.target_pid = ctx.cdev.pid;
 
 	if (eventfd_copy(dev, &eventfd_kick))
 		return -1;
@@ -577,7 +578,7 @@  cuse_set_vring_kick(struct vhost_device_ctx ctx, struct vhost_vring_file *file)
 	vq->callfd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
 	eventfd_call.source_fd = vq->callfd;
 	eventfd_call.target_fd = file->fd;
-	eventfd_call.target_pid = ctx.pid;
+	eventfd_call.target_pid = ctx.cdev.pid;
 
 	if (eventfd_copy(dev, &eventfd_call))
 		return -1;