Function virtio_send_command

dpdk/drivers/net/virtio/virtio_cvq.c:193–228

}

int
virtio_send_command(struct virtnet_ctl *cvq, struct virtio_pmd_ctrl *ctrl, int *dlen, int pkt_num)
{
	virtio_net_ctrl_ack status = ~0;
	struct virtio_pmd_ctrl *result;
	struct virtqueue *vq;

	ctrl->status = status;

	if (!cvq) {
		PMD_INIT_LOG(ERR, "Control queue is not supported.");
		return -1;
	}

	rte_spinlock_lock(&cvq->lock);
	vq = virtnet_cq_to_vq(cvq);

	PMD_INIT_LOG(DEBUG, "vq->vq_desc_head_idx = %d, status = %d, "
		"vq->hw->cvq = %p vq = %p",
		vq->vq_desc_head_idx, status, vq->hw->cvq, vq);

	if (vq->vq_free_cnt < pkt_num + 2 || pkt_num < 1) {
		rte_spinlock_unlock(&cvq->lock);
		return -1;
	}

	memcpy(cvq->hdr_mz->addr, ctrl, sizeof(struct virtio_pmd_ctrl));

	if (virtio_with_packed_queue(vq->hw))
		result = virtio_send_command_packed(cvq, ctrl, dlen, pkt_num);
	else
		result = virtio_send_command_split(cvq, ctrl, dlen, pkt_num);

	rte_spinlock_unlock(&cvq->lock);
	return result->status;
}