Function test_stop_start

dpdk/app/test/test_dmadev.c:333–373

}

static int
test_stop_start(int16_t dev_id, uint16_t vchan)
{
	/* device is already started on input, should be (re)started on output */

	uint16_t id = 0;
	enum rte_dma_status_code status = RTE_DMA_STATUS_SUCCESSFUL;

	/* - test stopping a device works ok,
	 * - then do a start-stop without doing a copy
	 * - finally restart the device
	 * checking for errors at each stage, and validating we can still copy at the end.
	 */
	if (rte_dma_stop(dev_id) < 0)
		ERR_RETURN("Error stopping device\n");

	if (rte_dma_start(dev_id) < 0)
		ERR_RETURN("Error restarting device\n");
	if (rte_dma_stop(dev_id) < 0)
		ERR_RETURN("Error stopping device after restart (no jobs executed)\n");

	if (rte_dma_start(dev_id) < 0)
		ERR_RETURN("Error restarting device after multiple stop-starts\n");

	/* before doing a copy, we need to know what the next id will be it should
	 * either be:
	 * - the last completed job before start if driver does not reset id on stop
	 * - or -1 i.e. next job is 0, if driver does reset the job ids on stop
	 */
	if (rte_dma_completed_status(dev_id, vchan, 1, &id, &status) != 0)
		ERR_RETURN("Error with rte_dma_completed_status when no job done\n");
	id += 1; /* id_count is next job id */
	if (id != id_count && id != 0)
		ERR_RETURN("Unexpected next id from device after stop-start. Got %u, expected %u or 0\n",
				id, id_count);

	id_count = id;
	if (test_single_copy(dev_id, vchan) < 0)
		ERR_RETURN("Error performing copy after device restart\n");
	return 0;
}

/* Failure handling test cases - global macros and variables for those tests*/
#define COMP_BURST_SZ	16