[RFC PATCH liburing 2/2] Add nop testing for IORING_SETUP_SQE_MIXED

[Keith Busch <kbusch@meta.com>]

From: Keith Busch <kbusch@kernel.org>

Add NOP testing for mixed sized SQEs.

Signed-off-by: Keith Busch <kbusch@kernel.org>
---
 test/Makefile |   1 +
 test/nop128.c | 105 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 106 insertions(+)
 create mode 100644 test/nop128.c

diff --git a/test/Makefile b/test/Makefile
index 54251bf2..b3a67393 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -150,6 +150,7 @@ test_srcs := \
 	nop.c \
 	nop32.c \
 	nop32-overflow.c \
+	nop128.c \
 	ooo-file-unreg.c \
 	openat2.c \
 	open-close.c \
diff --git a/test/nop128.c b/test/nop128.c
new file mode 100644
index 00000000..f9a2dd93
--- /dev/null
+++ b/test/nop128.c
@@ -0,0 +1,105 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Description: run various nop tests
+ *
+ */
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+
+#include "liburing.h"
+#include "helpers.h"
+#include "test.h"
+
+static int seq;
+
+static int test_single_nop(struct io_uring *ring, unsigned req_flags, bool sqe128)
+{
+	struct io_uring_cqe *cqe;
+	struct io_uring_sqe *sqe;
+	int ret;
+
+	if (sqe128)
+		sqe = _io_uring_get_sqe128_mixed(ring);
+	else
+		sqe = io_uring_get_sqe(ring);
+	if (!sqe) {
+		fprintf(stderr, "get sqe failed\n");
+		goto err;
+	}
+
+	io_uring_prep_nop(sqe);
+	sqe->user_data = ++seq;
+	sqe->flags |= req_flags;
+
+	ret = io_uring_submit(ring);
+	if (ret <= 0) {
+		fprintf(stderr, "sqe submit failed: %d\n", ret);
+		goto err;
+	}
+
+	ret = io_uring_wait_cqe(ring, &cqe);
+	if (ret < 0) {
+		fprintf(stderr, "wait completion %d\n", ret);
+		goto err;
+	}
+	if (cqe->user_data != seq) {
+		fprintf(stderr, "Unexpected user_data: %ld\n", (long) cqe->user_data);
+		goto err;
+	}
+	io_uring_cqe_seen(ring, cqe);
+	return T_EXIT_PASS;
+err:
+	return T_EXIT_FAIL;
+}
+
+static int test_ring(unsigned flags)
+{
+	struct io_uring ring;
+	struct io_uring_params p = { };
+	int ret, i;
+
+	p.flags = flags;
+	ret = io_uring_queue_init_params(8, &ring, &p);
+	if (ret) {
+		if (ret == -EINVAL)
+			return T_EXIT_SKIP;
+		fprintf(stderr, "ring setup failed: %d\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	test_single_nop(&ring, 0, 0);
+
+	for (i = 0; i < 16; i++) {
+		ret = test_single_nop(&ring, 0, 1);
+		if (ret) {
+			printf("fail off %d\n", i);
+			fprintf(stderr, "test_single_nop failed\n");
+			goto err;
+		}
+	}
+err:
+	io_uring_queue_exit(&ring);
+	return ret;
+}
+
+int main(int argc, char *argv[])
+{
+	int ret;
+
+	if (argc > 1)
+		return T_EXIT_SKIP;
+
+	ret = test_ring(IORING_SETUP_SQE_MIXED);
+	if (ret == T_EXIT_SKIP) {
+		return T_EXIT_SKIP;
+	} else if (ret != T_EXIT_PASS) {
+		fprintf(stderr, "Mixed ring test failed\n");
+		return ret;
+	}
+
+	return T_EXIT_PASS;
+}
-- 
2.47.3