[RFC PATCHv2 3/3] Add mixed sqe test for uring commands

[Keith Busch <kbusch@meta.com>]

From: Keith Busch <kbusch@kernel.org>

Signed-off-by: Keith Busch <kbusch@kernel.org>
---
 test/Makefile              |   1 +
 test/sqe-mixed-uring_cmd.c | 168 +++++++++++++++++++++++++++++++++++++
 2 files changed, 169 insertions(+)

diff --git a/test/Makefile b/test/Makefile
index a36c70a4..25af26a2 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -234,6 +234,7 @@ test_srcs := \
 	sq-space_left.c \
 	sqe-mixed-nop.c \
 	sqe-mixed-bad-wrap.c \
+	sqe-mixed-uring_cmd.c \
 	sqwait.c \
 	stdout.c \
 	submit-and-wait.c \
diff --git a/test/sqe-mixed-uring_cmd.c b/test/sqe-mixed-uring_cmd.c
index e69de29b..b213270b 100644
--- a/test/sqe-mixed-uring_cmd.c
+++ b/test/sqe-mixed-uring_cmd.c
@@ -0,0 +1,168 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Description: mixed sqes utilizing basic nop and io_uring passthrough commands
+ */
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "helpers.h"
+#include "liburing.h"
+#include "../src/syscall.h"
+#include "nvme.h"
+
+#define min(a, b)	((a) < (b) ? (a) : (b))
+
+static int seq;
+
+static int test_single_nop(struct io_uring *ring, unsigned req_flags)
+{
+	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");
+		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_single_nvme_read(struct io_uring *ring, int fd)
+{
+	struct nvme_uring_cmd *cmd;
+	struct io_uring_cqe *cqe;
+	struct io_uring_sqe *sqe;
+	int ret;
+
+	unsigned len = 0x1000;
+	unsigned char buf[0x1000] = {};
+
+	sqe = io_uring_get_sqe128_mixed(ring);
+	if (!sqe) {
+		fprintf(stderr, "get sqe failed\n");
+		goto err;
+	}
+
+	sqe->fd = fd;
+	sqe->user_data = ++seq;
+	sqe->opcode = IORING_OP_URING_CMD;
+	sqe->cmd_op = NVME_URING_CMD_IO;
+
+	cmd = (struct nvme_uring_cmd *)sqe->cmd;
+	memset(cmd, 0, sizeof(struct nvme_uring_cmd));
+	cmd->opcode = nvme_cmd_read;
+	cmd->cdw12 = (len >> lba_shift) - 1;
+	cmd->addr = (__u64)(uintptr_t)buf;
+	cmd->data_len = len;
+	cmd->nsid = nsid;
+
+	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->res != 0) {
+		fprintf(stderr, "cqe res %d, wanted 0\n", cqe->res);
+		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_io(const char *file)
+{
+	struct io_uring_params p = { .flags = IORING_SETUP_SQE_MIXED };
+	struct io_uring ring;
+	int fd, ret, i;
+
+	fd = open(file, O_RDONLY);
+	if (fd < 0) {
+		if (errno == EACCES || errno == EPERM)
+			return T_EXIT_SKIP;
+		perror("file open");
+		goto err;
+	}
+
+	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);
+		goto close;
+	}
+
+	for (i = 0; i < 32; i++) {
+		if (i & 2)
+			ret = test_single_nvme_read(&ring, fd);
+		else
+			ret = test_single_nop(&ring, 0);
+
+		if (ret) {
+			fprintf(stderr, "test_single_nop failed\n");
+			goto exit;
+		}
+	}
+
+	io_uring_queue_exit(&ring);
+	return T_EXIT_PASS;
+exit:
+	io_uring_queue_exit(&ring);
+close:
+	close(fd);
+err:
+	return T_EXIT_FAIL;
+}
+
+int main(int argc, char *argv[])
+{
+	int ret;
+
+	if (argc < 2)
+		return T_EXIT_SKIP;
+
+	ret = nvme_get_info(argv[1]);
+	if (ret)
+		return T_EXIT_SKIP;
+
+	return test_io(argv[1]);
+}
-- 
2.47.3