网卡驱动程序控制着网卡的通信过程，并为上层程序提供应用编程接口(API)。
NIC device driver controls the process of network card, and at the same time the device driver provides some application programming interfaces (APIs) for high layers.
他们讨论了一个有两层的应用程序结构：底层由一些功能组件组成，上层则由应用程序的流逻辑组成。
They discussed an application structure with two layers: the bottom layer is made up of functional components, while the top consists of the flow logic of the application.
virtio_driver 结构定义上层设备驱动程序、驱动程序支持的设备 ID 的列表、一个特性表单（取决于设备类型）和一个回调函数列表。
The virtio_driver structure defines the upper-level device driver, list of device IDs that the driver supports, a features table (dependent upon the device type), and a list of callback functions.
应用推荐