[PATCH 5/5] test/dmadev: add tests for stopping and restarting dev

[Bruce Richardson <bruce.richardson@intel.com>]

Validate device operation when a device is stopped or restarted.

The only complication - and gap in the dmadev ABI specification - is
what happens to the job ids on restart. Some drivers reset them to 0,
while others continue where things left off. Take account of both
posibilities in the test case.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 app/test/test_dmadev.c | 46 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/app/test/test_dmadev.c b/app/test/test_dmadev.c
index de787c14e2..8fb73a41e2 100644
--- a/app/test/test_dmadev.c
+++ b/app/test/test_dmadev.c
@@ -304,6 +304,48 @@ test_enqueue_copies(int16_t dev_id, uint16_t vchan)
 			|| do_multi_copies(dev_id, vchan, 0, 0, 1);
 }
 
+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
 #define OPT_FENCE(idx) ((fence && idx == 8) ? RTE_DMA_OP_FLAG_FENCE : 0)
@@ -819,6 +861,10 @@ test_dmadev_instance(int16_t dev_id)
 	if (runtest("copy", test_enqueue_copies, 640, dev_id, vchan, CHECK_ERRS) < 0)
 		goto err;
 
+	/* run tests stopping/starting devices and check jobs still work after restart */
+	if (runtest("stop-start", test_stop_start, 1, dev_id, vchan, CHECK_ERRS) < 0)
+		goto err;
+
 	/* run some burst capacity tests */
 	if (rte_dma_burst_capacity(dev_id, vchan) < 64)
 		printf("DMA Dev %u: insufficient burst capacity (64 required), skipping tests\n",
-- 
2.37.2