Function virtio_init_queue

dpdk/drivers/net/virtio/virtio_ethdev.c:230–290

}

static int
virtio_init_queue(struct rte_eth_dev *dev, uint16_t queue_idx)
{
	char vq_name[VIRTQUEUE_MAX_NAME_SZ];
	unsigned int vq_size;
	struct virtio_hw *hw = dev->data->dev_private;
	struct virtqueue *vq;
	int queue_type = virtio_get_queue_type(hw, queue_idx);
	int ret;
	int numa_node = dev->device->numa_node;

	PMD_INIT_LOG(INFO, "setting up queue: %u on NUMA node %d",
			queue_idx, numa_node);

	/*
	 * Read the virtqueue size from the Queue Size field
	 * Always power of 2 and if 0 virtqueue does not exist
	 */
	vq_size = VIRTIO_OPS(hw)->get_queue_num(hw, queue_idx);
	PMD_INIT_LOG(DEBUG, "vq_size: %u", vq_size);
	if (vq_size == 0) {
		PMD_INIT_LOG(ERR, "virtqueue does not exist");
		return -EINVAL;
	}

	if (!virtio_with_packed_queue(hw) && !rte_is_power_of_2(vq_size)) {
		PMD_INIT_LOG(ERR, "split virtqueue size is not power of 2");
		return -EINVAL;
	}

	snprintf(vq_name, sizeof(vq_name), "port%d_vq%d", dev->data->port_id, queue_idx);

	vq = virtqueue_alloc(hw, queue_idx, vq_size, queue_type, numa_node, vq_name);
	if (!vq) {
		PMD_INIT_LOG(ERR, "virtqueue init failed");
		return -ENOMEM;
	}

	hw->vqs[queue_idx] = vq;

	if (queue_type == VTNET_CQ) {
		hw->cvq = &vq->cq;
		vq->cq.notify_queue = &virtio_control_queue_notify;
	}

	if (VIRTIO_OPS(hw)->setup_queue(hw, vq) < 0) {
		PMD_INIT_LOG(ERR, "setup_queue failed");
		ret = -EINVAL;
		goto clean_vq;
	}

	return 0;

clean_vq:
	if (queue_type == VTNET_CQ)
		hw->cvq = NULL;
	virtqueue_free(vq);
	hw->vqs[queue_idx] = NULL;