[PATCHv6 3/6] test: add nop testing for IORING_SETUP_SQE_MIXED

[Keith Busch <kbusch@meta.com>]

From: Keith Busch <kbusch@kernel.org>

Test mixing 64 and 128 byte sqe entries on a queue.

Also introduce a negative test case that inserts a bad 128b operation at
the end of a mixed sqe to test the kernel's invalid entry detection.

Signed-off-by: Keith Busch <kbusch@kernel.org>
---
 test/Makefile              |  2 +
 test/sqe-mixed-bad-wrap.c  | 87 ++++++++++++++++++++++++++++++++++++++
 test/sqe-mixed-nop.c       | 82 +++++++++++++++++++++++++++++++++++
 test/sqe-mixed-uring_cmd.c |  0
 4 files changed, 171 insertions(+)
 create mode 100644 test/sqe-mixed-bad-wrap.c
 create mode 100644 test/sqe-mixed-nop.c
 create mode 100644 test/sqe-mixed-uring_cmd.c

diff --git a/test/Makefile b/test/Makefile
index b268cabf..ee1d492c 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -237,6 +237,8 @@ test_srcs := \
 	sq-poll-share.c \
 	sqpoll-sleep.c \
 	sq-space_left.c \
+	sqe-mixed-nop.c \
+	sqe-mixed-bad-wrap.c \
 	sqwait.c \
 	stdout.c \
 	submit-and-wait.c \
diff --git a/test/sqe-mixed-bad-wrap.c b/test/sqe-mixed-bad-wrap.c
new file mode 100644
index 00000000..ac0c8937
--- /dev/null
+++ b/test/sqe-mixed-bad-wrap.c
@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Description: run various nop tests
+ *
+ */
+#include <stdio.h>
+
+#include "liburing.h"
+#include "helpers.h"
+#include "test.h"
+
+static int seq;
+
+static int test_single_nop(struct io_uring *ring, bool should_fail)
+{
+	struct io_uring_cqe *cqe;
+	struct io_uring_sqe *sqe;
+	int ret;
+
+	sqe = io_uring_get_sqe(ring);
+	if (!sqe) {
+		fprintf(stderr, "get sqe failed\n");
+		return T_EXIT_FAIL;
+	}
+
+	if (should_fail)
+		io_uring_prep_nop128(sqe);
+	else
+		io_uring_prep_nop(sqe);
+	sqe->user_data = ++seq;
+
+	ret = io_uring_submit(ring);
+	if (ret <= 0) {
+		fprintf(stderr, "sqe submit failed: %d\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	ret = io_uring_wait_cqe(ring, &cqe);
+	if (ret < 0) {
+		fprintf(stderr, "wait completion %d\n", ret);
+	} else if (should_fail && cqe->res == 0) {
+		fprintf(stderr, "Unexpected success\n");
+	} else if (!should_fail && cqe->res != 0) {
+		fprintf(stderr, "Completion error:%d\n", cqe->res);
+	} else if (cqe->res == 0 && cqe->user_data != seq) {
+		fprintf(stderr, "Unexpected user_data: %ld\n", (long) cqe->user_data);
+	} else {
+		io_uring_cqe_seen(ring, cqe);
+		return T_EXIT_PASS;
+	}
+	return T_EXIT_FAIL;
+}
+
+int main(int argc, char *argv[])
+{
+	struct io_uring ring;
+	int ret, i;
+
+	if (argc > 1)
+		return T_EXIT_SKIP;
+
+	ret = io_uring_queue_init(8, &ring, IORING_SETUP_SQE_MIXED);
+	if (ret) {
+		if (ret == -EINVAL)
+			return T_EXIT_SKIP;
+		fprintf(stderr, "ring setup failed: %d\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	/* prime the sq to the last entry before wrapping */
+	for (i = 0; i < 7; i++) {
+		ret = test_single_nop(&ring, false);
+		if (ret != T_EXIT_PASS)
+			goto done;
+	}
+
+	/* inserting a 128b sqe in the last entry should fail */
+	ret = test_single_nop(&ring, true);
+	if (ret != T_EXIT_PASS)
+		goto done;
+
+	/* proceeding from the bad wrap should succeed */
+	ret = test_single_nop(&ring, false);
+done:
+	io_uring_queue_exit(&ring);
+	return ret;
+}
diff --git a/test/sqe-mixed-nop.c b/test/sqe-mixed-nop.c
new file mode 100644
index 00000000..f8a232a7
--- /dev/null
+++ b/test/sqe-mixed-nop.c
@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Description: run various nop tests
+ *
+ */
+#include <stdio.h>
+
+#include "liburing.h"
+#include "helpers.h"
+#include "test.h"
+
+static int seq;
+
+static int test_single_nop(struct io_uring *ring, bool sqe128)
+{
+	struct io_uring_cqe *cqe;
+	struct io_uring_sqe *sqe;
+	int ret;
+
+	if (sqe128)
+		sqe = io_uring_get_sqe128(ring);
+	else
+		sqe = io_uring_get_sqe(ring);
+
+	if (!sqe) {
+		fprintf(stderr, "get sqe failed\n");
+		return T_EXIT_FAIL;
+	}
+
+	if (sqe128)
+		io_uring_prep_nop128(sqe);
+	else
+		io_uring_prep_nop(sqe);
+
+	sqe->user_data = ++seq;
+
+	ret = io_uring_submit(ring);
+	if (ret <= 0) {
+		fprintf(stderr, "sqe submit failed: %d\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	ret = io_uring_wait_cqe(ring, &cqe);
+	if (ret < 0) {
+		fprintf(stderr, "wait completion %d\n", ret);
+	} else if (cqe->res != 0) {
+		fprintf(stderr, "Completion error:%d\n", cqe->res);
+	} else if (cqe->user_data != seq) {
+		fprintf(stderr, "Unexpected user_data: %ld\n", (long) cqe->user_data);
+	} else {
+		io_uring_cqe_seen(ring, cqe);
+		return T_EXIT_PASS;
+	}
+	return T_EXIT_FAIL;
+}
+
+int main(int argc, char *argv[])
+{
+	struct io_uring ring;
+	int ret, i;
+
+	if (argc > 1)
+		return T_EXIT_SKIP;
+
+	ret = io_uring_queue_init(8, &ring, IORING_SETUP_SQE_MIXED);
+	if (ret) {
+		if (ret == -EINVAL)
+			return T_EXIT_SKIP;
+		fprintf(stderr, "ring setup failed: %d\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	/* alternate big and little sqe's */
+	for (i = 0; i < 32; i++) {
+		ret = test_single_nop(&ring, i & 1);
+		if (ret != T_EXIT_PASS)
+			break;
+	}
+
+	io_uring_queue_exit(&ring);
+	return ret;
+}
diff --git a/test/sqe-mixed-uring_cmd.c b/test/sqe-mixed-uring_cmd.c
new file mode 100644
index 00000000..e69de29b
-- 
2.47.3