/**
* rpmsg_virtio_enqueue_buffer
*
* Places buffer on the virtqueue for consumption by the other side.
*
* @param rvdev - pointer to rpmsg virtio
* @param buffer - buffer pointer
* @param len - buffer length
* @param idx - buffer index
*
* @return - status of function execution
*/
static int rpmsg_virtio_enqueue_buffer(struct rpmsg_virtio_device *rvdev,
void *buffer, uint32_t len,
uint16_t idx)
{
unsigned int role = rpmsg_virtio_get_role(rvdev);
#ifndef VIRTIO_SLAVE_ONLY
if (role == RPMSG_MASTER) {
struct virtqueue_buf vqbuf;
(void)idx;
/* Initialize buffer node */
vqbuf.buf = buffer;
vqbuf.len = len;
return virtqueue_add_buffer(rvdev->svq, &vqbuf, 1, 0, buffer);
}
#endif /*!VIRTIO_SLAVE_ONLY*/
#ifndef VIRTIO_MASTER_ONLY
if (role == RPMSG_REMOTE) {
(void)buffer;
return virtqueue_add_consumed_buffer(rvdev->svq, idx, len);
}
#endif /*!VIRTIO_MASTER_ONLY*/
return 0;
}
/**
* rpmsg_return_buffer
*
* Places the used buffer back on the virtqueue.
*
* @param rdev - pointer to remote core
* @param buffer - buffer pointer
* @param len - buffer length
* @param idx - buffer index
*
*/
void rpmsg_return_buffer(struct remote_device *rdev, void *buffer,
unsigned long len, unsigned short idx) {
struct llist node;
/* Initialize buffer node */
node.data = buffer;
node.attr = len;
node.next = RPMSG_NULL;
node.prev = RPMSG_NULL;
if (rdev->role == RPMSG_REMOTE) {
virtqueue_add_buffer(rdev->rvq, &node, 0, 1, buffer);
} else {
virtqueue_add_consumed_buffer(rdev->rvq, idx, len);
}
}
