[PATCH v2 1/2] test/dma: update the sg test to verify wrap around case

[Tejasree Kondoj]

Run the sg test in a loop to verify wrap around case.
Total number commands submitted to be more than the number descriptors
allocated to verify the scenario.

Signed-off-by: Vidya Sagar Velumuri <vvelumuri at marvell.com>
Signed-off-by: Tejasree Kondoj <ktejasree at marvell.com>
---
 app/test/test_dmadev.c     | 45 ++++++++++++++++++++++++--------------
 app/test/test_dmadev_api.c |  1 -
 app/test/test_dmadev_api.h |  2 ++
 3 files changed, 31 insertions(+), 17 deletions(-)

diff --git a/app/test/test_dmadev.c b/app/test/test_dmadev.c
index 5488a1af33..b30f2214e5 100644
--- a/app/test/test_dmadev.c
+++ b/app/test/test_dmadev.c
@@ -393,36 +393,28 @@ test_stop_start(int16_t dev_id, uint16_t vchan)
 }
 
 static int
-test_enqueue_sg_copies(int16_t dev_id, uint16_t vchan)
+test_enqueue_sg(int16_t dev_id, uint16_t vchan, unsigned int n_sge, unsigned int test_len)
 {
-	unsigned int src_len, dst_len, n_sge, len, i, j, k;
 	char orig_src[COPY_LEN], orig_dst[COPY_LEN];
-	struct rte_dma_info info = { 0 };
+	unsigned int src_len, dst_len, i, j, k;
 	enum rte_dma_status_code status;
 	uint16_t id, n_src, n_dst;
 
-	if (rte_dma_info_get(dev_id, &info) < 0)
-		ERR_RETURN("Failed to get dev info");
-
-	if (info.max_sges < 2)
-		ERR_RETURN("Test needs minimum 2 SG pointers");
-
-	n_sge = info.max_sges;
-
 	for (n_src = 1; n_src <= n_sge; n_src++) {
 		for (n_dst = 1; n_dst <= n_sge; n_dst++) {
 			/* Normalize SG buffer lengths */
-			len = COPY_LEN;
-			len -= (len % (n_src * n_dst));
-			dst_len = len / n_dst;
-			src_len = len / n_src;
-
 			struct rte_dma_sge *sg_src = alloca(sizeof(struct rte_dma_sge) * n_sge);
 			struct rte_dma_sge *sg_dst = alloca(sizeof(struct rte_dma_sge) * n_sge);
 			struct rte_mbuf **src = alloca(sizeof(struct rte_mbuf *) * n_sge);
 			struct rte_mbuf **dst = alloca(sizeof(struct rte_mbuf *) * n_sge);
 			char **src_data = alloca(sizeof(char *) * n_sge);
 			char **dst_data = alloca(sizeof(char *) * n_sge);
+			unsigned int len = test_len - (test_len % (n_src * n_dst));
+
+			dst_len = len / n_dst;
+			src_len = len / n_src;
+			if (dst_len == 0 || src_len == 0)
+				continue;
 
 			for (i = 0 ; i < len; i++)
 				orig_src[i] = rte_rand() & 0xFF;
@@ -514,6 +506,27 @@ test_enqueue_sg_copies(int16_t dev_id, uint16_t vchan)
 	return 0;
 }
 
+static int
+test_enqueue_sg_copies(int16_t dev_id, uint16_t vchan)
+{
+	struct rte_dma_info info = { 0 };
+	unsigned int n_sge, len;
+	int loop_count = 0;
+
+	if (rte_dma_info_get(dev_id, &info) < 0)
+		ERR_RETURN("Failed to get dev info");
+
+	n_sge = RTE_MIN(info.max_sges, TEST_SG_MAX);
+	len = COPY_LEN;
+
+	do {
+		test_enqueue_sg(dev_id, vchan, n_sge, len);
+		loop_count++;
+	} while (loop_count * n_sge * n_sge < TEST_RINGSIZE * 3);
+
+	return 0;
+}
+
 static int
 test_single_sva_copy(int16_t dev_id, uint16_t vchan, const char *mem_src,
 		     char *src, char *dst, uint32_t len)
diff --git a/app/test/test_dmadev_api.c b/app/test/test_dmadev_api.c
index 1ba053696b..4bb8f9e820 100644
--- a/app/test/test_dmadev_api.c
+++ b/app/test/test_dmadev_api.c
@@ -16,7 +16,6 @@ extern int test_dma_api(uint16_t dev_id);
 
 #define TEST_MEMCPY_SIZE	1024
 #define TEST_WAIT_US_VAL	50000
-#define TEST_SG_MAX		64
 
 static int16_t test_dev_id;
 static int16_t invalid_dev_id;
diff --git a/app/test/test_dmadev_api.h b/app/test/test_dmadev_api.h
index 33fbc5bd41..a03f7acd4f 100644
--- a/app/test/test_dmadev_api.h
+++ b/app/test/test_dmadev_api.h
@@ -2,4 +2,6 @@
  * Copyright(c) 2021 HiSilicon Limited
  */
 
+#define TEST_SG_MAX		64
+
 int test_dma_api(uint16_t dev_id);
-- 
2.34.1