tb_tunnel_alloc_usb3
tunnel = tb_tunnel_alloc_usb3(tb, up, down, available_up,
tunnel1 = tb_tunnel_alloc_usb3(NULL, up, down, 0, 0);
tunnel2 = tb_tunnel_alloc_usb3(NULL, up, down, 0, 0);
tunnel = tb_tunnel_alloc_usb3(NULL, up, down, 0, 0);
usb3_tunnel = tb_tunnel_alloc_usb3(NULL, up, down, 0, 0);
struct tb_tunnel *tb_tunnel_alloc_usb3(struct tb *tb, struct tb_port *up,