[PATCH liburing 2/2] tests: fix and improve nop tests

[Pavel Begunkov <asml.silence@gmail.com>]

We removed CQE32 for nops from the kernel, fix the tests and instead
test that we return zeroes in the extra fields instead of garbage.
Loop over the tests multiple times so it exhausts CQ and we also test
CQ entries recycling and internal caching mechanism. Also excersie
IOSQE_ASYNC.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 test/nop.c | 47 ++++++++++++++++++++++-------------------------
 1 file changed, 22 insertions(+), 25 deletions(-)

diff --git a/test/nop.c b/test/nop.c
index ce223b3..1aa88fc 100644
--- a/test/nop.c
+++ b/test/nop.c
@@ -15,7 +15,7 @@
 
 static int seq;
 
-static int test_single_nop(struct io_uring *ring)
+static int test_single_nop(struct io_uring *ring, unsigned req_flags)
 {
 	struct io_uring_cqe *cqe;
 	struct io_uring_sqe *sqe;
@@ -29,11 +29,8 @@ static int test_single_nop(struct io_uring *ring)
 	}
 
 	io_uring_prep_nop(sqe);
-	if (cqe32) {
-		sqe->addr = 1234;
-		sqe->addr2 = 5678;
-	}
 	sqe->user_data = ++seq;
+	sqe->flags |= req_flags;
 
 	ret = io_uring_submit(ring);
 	if (ret <= 0) {
@@ -51,12 +48,12 @@ static int test_single_nop(struct io_uring *ring)
 		goto err;
 	}
 	if (cqe32) {
-		if (cqe->big_cqe[0] != 1234) {
+		if (cqe->big_cqe[0] != 0) {
 			fprintf(stderr, "Unexpected extra1\n");
 			goto err;
 
 		}
-		if (cqe->big_cqe[1] != 5678) {
+		if (cqe->big_cqe[1] != 0) {
 			fprintf(stderr, "Unexpected extra2\n");
 			goto err;
 		}
@@ -67,7 +64,7 @@ err:
 	return 1;
 }
 
-static int test_barrier_nop(struct io_uring *ring)
+static int test_barrier_nop(struct io_uring *ring, unsigned req_flags)
 {
 	struct io_uring_cqe *cqe;
 	struct io_uring_sqe *sqe;
@@ -84,11 +81,8 @@ static int test_barrier_nop(struct io_uring *ring)
 		io_uring_prep_nop(sqe);
 		if (i == 4)
 			sqe->flags = IOSQE_IO_DRAIN;
-		if (cqe32) {
-			sqe->addr = 1234;
-			sqe->addr2 = 5678;
-		}
 		sqe->user_data = ++seq;
+		sqe->flags |= req_flags;
 	}
 
 	ret = io_uring_submit(ring);
@@ -111,11 +105,11 @@ static int test_barrier_nop(struct io_uring *ring)
 			goto err;
 		}
 		if (cqe32) {
-			if (cqe->big_cqe[0] != 1234) {
+			if (cqe->big_cqe[0] != 0) {
 				fprintf(stderr, "Unexpected extra1\n");
 				goto err;
 			}
-			if (cqe->big_cqe[1] != 5678) {
+			if (cqe->big_cqe[1] != 0) {
 				fprintf(stderr, "Unexpected extra2\n");
 				goto err;
 			}
@@ -132,7 +126,7 @@ static int test_ring(unsigned flags)
 {
 	struct io_uring ring;
 	struct io_uring_params p = { };
-	int ret;
+	int ret, i;
 
 	p.flags = flags;
 	ret = io_uring_queue_init_params(8, &ring, &p);
@@ -143,18 +137,21 @@ static int test_ring(unsigned flags)
 		return 1;
 	}
 
-	ret = test_single_nop(&ring);
-	if (ret) {
-		fprintf(stderr, "test_single_nop failed\n");
-		goto err;
-	}
+	for (i = 0; i < 1000; i++) {
+		unsigned req_flags = (i & 1) ? IOSQE_ASYNC : 0;
 
-	ret = test_barrier_nop(&ring);
-	if (ret) {
-		fprintf(stderr, "test_barrier_nop failed\n");
-		goto err;
-	}
+		ret = test_single_nop(&ring, req_flags);
+		if (ret) {
+			fprintf(stderr, "test_single_nop failed\n");
+			goto err;
+		}
 
+		ret = test_barrier_nop(&ring, req_flags);
+		if (ret) {
+			fprintf(stderr, "test_barrier_nop failed\n");
+			goto err;
+		}
+	}
 err:
 	io_uring_queue_exit(&ring);
 	return ret;
-- 
2.36.1