[PATCH rdma-next v4 3/4] tools/testing/scatterlist: Show errors in human readable form

[Leon Romanovsky <leon@kernel.org>]

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Instead of just asserting dump some more useful info about what the test
saw versus what it expected to see.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Maor Gottlieb <maorg@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
 tools/testing/scatterlist/main.c | 44 ++++++++++++++++++++++++--------
 1 file changed, 34 insertions(+), 10 deletions(-)

diff --git a/tools/testing/scatterlist/main.c b/tools/testing/scatterlist/main.c
index 4899359a31ac..b2c7e9f7b8d3 100644
--- a/tools/testing/scatterlist/main.c
+++ b/tools/testing/scatterlist/main.c
@@ -5,6 +5,15 @@

 #define MAX_PAGES (64)

+struct test {
+	int alloc_ret;
+	unsigned num_pages;
+	unsigned *pfn;
+	unsigned size;
+	unsigned int max_seg;
+	unsigned int expected_segments;
+};
+
 static void set_pages(struct page **pages, const unsigned *array, unsigned num)
 {
 	unsigned int i;
@@ -17,17 +26,32 @@ static void set_pages(struct page **pages, const unsigned *array, unsigned num)

 #define pfn(...) (unsigned []){ __VA_ARGS__ }

+static void fail(struct test *test, struct sg_table *st, const char *cond)
+{
+	unsigned int i;
+
+	fprintf(stderr, "Failed on '%s'!\n\n", cond);
+
+	printf("size = %u, max segment = %u, expected nents = %u\nst->nents = %u, st->orig_nents= %u\n",
+	       test->size, test->max_seg, test->expected_segments, st->nents,
+	       st->orig_nents);
+
+	printf("%u input PFNs:", test->num_pages);
+	for (i = 0; i < test->num_pages; i++)
+		printf(" %x", test->pfn[i]);
+	printf("\n");
+
+	exit(1);
+}
+
+#define VALIDATE(cond, st, test) \
+	if (!(cond)) \
+		fail((test), (st), #cond);
+
 int main(void)
 {
 	const unsigned int sgmax = SCATTERLIST_MAX_SEGMENT;
-	struct test {
-		int alloc_ret;
-		unsigned num_pages;
-		unsigned *pfn;
-		unsigned size;
-		unsigned int max_seg;
-		unsigned int expected_segments;
-	} *test, tests[] = {
+	struct test *test, tests[] = {
 		{ -EINVAL, 1, pfn(0), PAGE_SIZE, PAGE_SIZE + 1, 1 },
 		{ -EINVAL, 1, pfn(0), PAGE_SIZE, 0, 1 },
 		{ -EINVAL, 1, pfn(0), PAGE_SIZE, sgmax + 1, 1 },
@@ -66,8 +90,8 @@ int main(void)
 		if (test->alloc_ret)
 			continue;

-		assert(st.nents == test->expected_segments);
-		assert(st.orig_nents == test->expected_segments);
+		VALIDATE(st.nents == test->expected_segments, &st, test);
+		VALIDATE(st.orig_nents == test->expected_segments, &st, test);

 		sg_free_table(&st);
 	}
--
2.26.2