linux-kernel - [PATCH bpf-next v2 16/16] selftests/bpf: wq: add bpf_wq

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Message-Id: <20240420-bpf_wq-v2-16-6c986a5a741f@kernel.org>
Date: Sat, 20 Apr 2024 11:09:16 +0200
From: Benjamin Tissoires <bentiss@...nel.org>
To: Alexei Starovoitov <ast@...nel.org>, 
 Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, 
 Martin KaFai Lau <martin.lau@...ux.dev>, 
 Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>, 
 Yonghong Song <yonghong.song@...ux.dev>, 
 John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>, 
 Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, 
 Jiri Olsa <jolsa@...nel.org>, Mykola Lysenko <mykolal@...com>, 
 Shuah Khan <shuah@...nel.org>
Cc: bpf@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, Benjamin Tissoires <bentiss@...nel.org>
Subject: [PATCH bpf-next v2 16/16] selftests/bpf: wq: add bpf_wq_start()
 checks

Allows to test if allocation/free works

Signed-off-by: Benjamin Tissoires <bentiss@...nel.org>

---

changes in v2:
- remove #define CLOCK_MONOTONIC 1 leftover
---
 tools/testing/selftests/bpf/bpf_experimental.h |  1 +
 tools/testing/selftests/bpf/prog_tests/wq.c    | 22 ++++++++++++++++++++++
 tools/testing/selftests/bpf/progs/wq.c         | 20 +++++++++++++++++---
 3 files changed, 40 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/bpf/bpf_experimental.h b/tools/testing/selftests/bpf/bpf_experimental.h
index b80b39f76034..93c5a6c446b3 100644
--- a/tools/testing/selftests/bpf/bpf_experimental.h
+++ b/tools/testing/selftests/bpf/bpf_experimental.h
@@ -471,6 +471,7 @@ extern struct cgroup_subsys_state *bpf_iter_css_next(struct bpf_iter_css *it) __
 extern void bpf_iter_css_destroy(struct bpf_iter_css *it) __weak __ksym;
 
 extern int bpf_wq_init(struct bpf_wq *wq, void *p__map, unsigned int flags) __weak __ksym;
+extern int bpf_wq_start(struct bpf_wq *wq, unsigned int flags) __weak __ksym;
 extern int bpf_wq_set_callback_impl(struct bpf_wq *wq,
 		int (callback_fn)(void *map, int *key, struct bpf_wq *wq),
 		unsigned int flags__k, void *aux__ign) __ksym;
diff --git a/tools/testing/selftests/bpf/prog_tests/wq.c b/tools/testing/selftests/bpf/prog_tests/wq.c
index 26ab69796103..8a4a91d944cc 100644
--- a/tools/testing/selftests/bpf/prog_tests/wq.c
+++ b/tools/testing/selftests/bpf/prog_tests/wq.c
@@ -6,9 +6,31 @@
 
 void serial_test_wq(void)
 {
+	struct wq *wq_skel = NULL;
+	int err, prog_fd;
+
 	LIBBPF_OPTS(bpf_test_run_opts, topts);
 
 	RUN_TESTS(wq);
+
+	/* re-run the success test to check if the timer was actually executed */
+
+	wq_skel = wq__open_and_load();
+	if (!ASSERT_OK_PTR(wq_skel, "wq_skel_load"))
+		return;
+
+	err = wq__attach(wq_skel);
+	if (!ASSERT_OK(err, "wq_attach"))
+		return;
+
+	prog_fd = bpf_program__fd(wq_skel->progs.test_syscall_array_sleepable);
+	err = bpf_prog_test_run_opts(prog_fd, &topts);
+	ASSERT_OK(err, "test_run");
+	ASSERT_EQ(topts.retval, 0, "test_run");
+
+	usleep(50); /* 10 usecs should be enough, but give it extra */
+
+	ASSERT_EQ(wq_skel->bss->ok_sleepable, (1 << 1), "ok_sleepable");
 }
 
 void serial_test_failures_wq(void)
diff --git a/tools/testing/selftests/bpf/progs/wq.c b/tools/testing/selftests/bpf/progs/wq.c
index f746296d32b1..8011a27a2fbd 100644
--- a/tools/testing/selftests/bpf/progs/wq.c
+++ b/tools/testing/selftests/bpf/progs/wq.c
@@ -49,12 +49,19 @@ struct {
 	__type(value, struct elem);
 } lru SEC(".maps");
 
+__u32 ok;
+__u32 ok_sleepable;
+
 static int test_elem_callback(void *map, int *key,
 		int (callback_fn)(void *map, int *key, struct bpf_wq *wq))
 {
 	struct elem init = {}, *val;
 	struct bpf_wq *wq;
 
+	if ((ok & (1 << *key) ||
+	    (ok_sleepable & (1 << *key))))
+		return -22;
+
 	if (map == &lru &&
 	    bpf_map_update_elem(map, key, &init, 0))
 		return -1;
@@ -70,6 +77,9 @@ static int test_elem_callback(void *map, int *key,
 	if (bpf_wq_set_callback(wq, callback_fn, 0))
 		return -4;
 
+	if (bpf_wq_start(wq, 0))
+		return -5;
+
 	return 0;
 }
 
@@ -79,6 +89,10 @@ static int test_hmap_elem_callback(void *map, int *key,
 	struct hmap_elem init = {}, *val;
 	struct bpf_wq *wq;
 
+	if ((ok & (1 << *key) ||
+	    (ok_sleepable & (1 << *key))))
+		return -22;
+
 	if (bpf_map_update_elem(map, key, &init, 0))
 		return -1;
 
@@ -93,12 +107,12 @@ static int test_hmap_elem_callback(void *map, int *key,
 	if (bpf_wq_set_callback(wq, callback_fn, 0))
 		return -4;
 
+	if (bpf_wq_start(wq, 0))
+		return -5;
+
 	return 0;
 }
 
-__u32 ok;
-__u32 ok_sleepable;
-
 /* callback for non sleepable workqueue */
 static int wq_callback(void *map, int *key, struct bpf_wq *work)
 {

-- 
2.44.0