virtio 框架简介

virtio 框架是一中传输机制

 

virtqueues: A Transport Abstraction

/**
 * virtqueue - a queue to register buffers for sending or receiving.
 * @list: the chain of virtqueues for this device
 * @callback: the function to call when buffers are consumed (can be NULL).
 * @name: the name of this virtqueue (mainly for debugging)
 * @vdev: the virtio device this queue was created for.
 * @priv: a pointer for the virtqueue implementation to use.
 * @index: the zero-based ordinal number for this queue.
 * @num_free: number of elements we expect to be able to fit.
 *
 * A note on @num_free: with indirect buffers, each buffer needs one
 * element in the queue, otherwise a buffer will need one element per
 * sg element.
 */
struct virtqueue {
        struct list_head list;
        void (*callback)(struct virtqueue *vq);
        const char *name;
        struct virtio_device *vdev;
        unsigned int index;
        unsigned int num_free;