On Fri, Sep 22, 2017 at 04:02:31PM +0800, Jason Wang wrote: > +/* This looks in the virtqueue and for the first available buffer, and converts > + * it to an iovec for convenient access. Since descriptors consist of some > + * number of output then some number of input descriptors, it's actually two > + * iovecs, but we pack them into one and note how many of each there were. > + * > + * This function returns the descriptor number found, or vq->num (which is > + * never a valid descriptor number) if none was found. A negative code is > + * returned on error. */ > +int __vhost_get_vq_desc(struct vhost_virtqueue *vq, > + struct iovec iov[], unsigned int iov_size, > + unsigned int *out_num, unsigned int *in_num, > + struct vhost_log *log, unsigned int *log_num, > + __virtio16 head) [...] > +int vhost_get_vq_desc(struct vhost_virtqueue *vq, > + struct iovec iov[], unsigned int iov_size, > + unsigned int *out_num, unsigned int *in_num, > + struct vhost_log *log, unsigned int *log_num) Please document vhost_get_vq_desc(). Please also explain the difference between __vhost_get_vq_desc() and vhost_get_vq_desc() in the documentation.
