[dpdk-dev] [PATCH v3 2/5] test: add rte_pktmbuf_linearize unit tests

[Tomasz Kulasek <tomaszx.kulasek@intel.com>]

This patch tests rte_pktmbuf_linearize functionality:

 1) Creates banch of segmented mbufs with different size and number of
    segments.
 2) Generates pkt_len bytes of random data.
 3) Fills noncontigouos mbuf with randomly generated data.
 4) Uses rte_pktmbuf_linearize to coalesce segmented buffer into one
    contiguous.
 5) Verifies data in linearized buffer.

Signed-off-by: Tomasz Kulasek <tomaszx.kulasek@intel.com>
---
 app/test/test_mbuf.c |  123 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)

diff --git a/app/test/test_mbuf.c b/app/test/test_mbuf.c
index c0823ea..39577e7 100644
--- a/app/test/test_mbuf.c
+++ b/app/test/test_mbuf.c
@@ -930,6 +930,124 @@
 	return 0;
 }
 
+static int
+test_mbuf_linearize(int pkt_len, int nb_segs) {
+
+	struct rte_mbuf *m = NULL, *mbuf_src = NULL;
+	uint8_t data[pkt_len], *src, *dst;
+	int data_len = 0;
+	int i, size;
+	int t_len;
+
+	if (pkt_len < 1) {
+		printf("Packet size must be 1 or more (is %d)\n", pkt_len);
+		return -1;
+	}
+
+	if (nb_segs < 1) {
+		printf("Number of segments must be 1 or more (is %d)\n",
+				nb_segs);
+		return -1;
+	}
+
+	/* Setup buffer */
+	for (i = 0; i < pkt_len; i++)
+		data[i] = (uint8_t) rte_rand();
+
+	t_len = pkt_len >= nb_segs ? pkt_len / nb_segs : 1;
+	src = data;
+	size = pkt_len;
+
+	/* Create chained mbuf_src and fill it generated data */
+	for (i = 0; size > 0; i++) {
+
+		m = rte_pktmbuf_alloc(pktmbuf_pool);
+		if (i == 0)
+			mbuf_src = m;
+
+		if (!m) {
+			printf("Cannot create segment for source mbuf");
+			goto fail;
+		}
+
+		/* Make sure if tailroom is zeroed */
+		memset(rte_pktmbuf_mtod(m, uint8_t *), 0,
+				rte_pktmbuf_tailroom(m));
+
+		data_len = size > t_len ? t_len : size;
+		dst = (uint8_t *)rte_pktmbuf_append(m, data_len);
+		if (!dst) {
+			printf("Cannot append %d bytes to the mbuf\n",
+					data_len);
+			goto fail;
+		}
+
+		rte_memcpy(dst, src, data_len);
+		src += data_len;
+
+		if (mbuf_src != m)
+			rte_pktmbuf_chain(mbuf_src, m);
+
+		size -= data_len;
+
+	}
+
+	/* Create destination buffer to store coalesced data */
+	if (rte_pktmbuf_linearize(mbuf_src)) {
+		printf("Mbuf linearization failed\n");
+		goto fail;
+	}
+
+	if (!rte_pktmbuf_is_contiguous(mbuf_src)) {
+		printf("Source buffer should be contiguous after "
+				"linearization\n");
+		goto fail;
+	}
+
+	src = rte_pktmbuf_mtod(mbuf_src, uint8_t *);
+
+	if (memcmp(src, data, rte_pktmbuf_pkt_len(mbuf_src))) {
+		printf("Incorrect data in coalesced mbuf\n");
+		goto fail;
+	}
+
+	if (mbuf_src)
+		rte_pktmbuf_free(mbuf_src);
+	return 0;
+
+fail:
+	if (mbuf_src)
+		rte_pktmbuf_free(mbuf_src);
+	return -1;
+}
+
+static int
+test_mbuf_linearize_check(void)
+{
+	struct test_mbuf_array {
+		int size;
+		int nb_segs;
+	} mbuf_array[5] = {
+			{ 128, 1 },
+			{ 64, 64 },
+			{ 512, 10 },
+			{ 250, 11 },
+			{ 123, 8 },
+	};
+	unsigned int i;
+
+	printf("Test mbuf linearize API\n");
+
+	for (i = 0; i < RTE_DIM(mbuf_array); i++)
+		if (test_mbuf_linearize(mbuf_array[i].size,
+				mbuf_array[i].nb_segs)) {
+			printf("Test failed for %d, %d\n", mbuf_array[i].size,
+					mbuf_array[i].nb_segs);
+			return -1;
+		}
+
+	return 0;
+}
 
 static int
 test_mbuf(void)
@@ -1023,6 +1141,11 @@
 		printf("test_failing_mbuf_sanity_check() failed\n");
 		return -1;
 	}
+
+	if (test_mbuf_linearize_check() < 0) {
+		printf("test_mbuf_linearize_check() failed\n");
+		return -1;
+	}
 	return 0;
 }
 
-- 
1.7.9.5