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Message-Id: <20240416-bpf_wq-v1-10-c9e66092f842@kernel.org>
Date: Tue, 16 Apr 2024 16:08:23 +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 10/18] selftests/bpf: add bpf_wq tests
We simply try in all supported map types if we can store/load a bpf_wq.
Signed-off-by: Benjamin Tissoires <bentiss@...nel.org>
---
tools/testing/selftests/bpf/prog_tests/wq.c | 11 +++
tools/testing/selftests/bpf/progs/wq.c | 135 ++++++++++++++++++++++++++++
2 files changed, 146 insertions(+)
diff --git a/tools/testing/selftests/bpf/prog_tests/wq.c b/tools/testing/selftests/bpf/prog_tests/wq.c
new file mode 100644
index 000000000000..9a07b8bc2c52
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/wq.c
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2024 Benjamin Tissoires */
+#include <test_progs.h>
+#include "wq.skel.h"
+
+void serial_test_wq(void)
+{
+ LIBBPF_OPTS(bpf_test_run_opts, topts);
+
+ RUN_TESTS(wq);
+}
diff --git a/tools/testing/selftests/bpf/progs/wq.c b/tools/testing/selftests/bpf/progs/wq.c
new file mode 100644
index 000000000000..8c668ad04059
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/wq.c
@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2024 Benjamin Tissoires
+ */
+
+#include "bpf_experimental.h"
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+#include "../bpf_testmod/bpf_testmod_kfunc.h"
+
+char _license[] SEC("license") = "GPL";
+
+struct hmap_elem {
+ int counter;
+ struct bpf_timer timer; /* unused */
+ struct bpf_spin_lock lock; /* unused */
+ struct bpf_wq work;
+};
+
+struct {
+ __uint(type, BPF_MAP_TYPE_HASH);
+ __uint(max_entries, 1000);
+ __type(key, int);
+ __type(value, struct hmap_elem);
+} hmap SEC(".maps");
+
+struct {
+ __uint(type, BPF_MAP_TYPE_HASH);
+ __uint(map_flags, BPF_F_NO_PREALLOC);
+ __uint(max_entries, 1000);
+ __type(key, int);
+ __type(value, struct hmap_elem);
+} hmap_malloc SEC(".maps");
+
+struct elem {
+ struct bpf_wq w;
+};
+
+struct {
+ __uint(type, BPF_MAP_TYPE_ARRAY);
+ __uint(max_entries, 2);
+ __type(key, int);
+ __type(value, struct elem);
+} array SEC(".maps");
+
+struct {
+ __uint(type, BPF_MAP_TYPE_LRU_HASH);
+ __uint(max_entries, 4);
+ __type(key, int);
+ __type(value, struct elem);
+} lru SEC(".maps");
+
+static int test_elem_callback(void *map, int *key)
+{
+ struct elem init = {}, *val;
+
+ if (map == &lru &&
+ bpf_map_update_elem(map, key, &init, 0))
+ return -1;
+
+ val = bpf_map_lookup_elem(map, key);
+ if (!val)
+ return -2;
+
+ return 0;
+}
+
+static int test_hmap_elem_callback(void *map, int *key)
+{
+ struct hmap_elem init = {}, *val;
+
+ if (bpf_map_update_elem(map, key, &init, 0))
+ return -1;
+
+ val = bpf_map_lookup_elem(map, key);
+ if (!val)
+ return -2;
+
+ return 0;
+}
+
+SEC("tc")
+/* test that workqueues can be used from an array
+ */
+__retval(0)
+long test_call_array_sleepable(void *ctx)
+{
+ int key = 0;
+
+ return test_elem_callback(&array, &key);
+}
+
+SEC("syscall")
+/* Same test than above but from a sleepable context.
+ */
+__retval(0)
+long test_syscall_array_sleepable(void *ctx)
+{
+ int key = 1;
+
+ return test_elem_callback(&array, &key);
+}
+
+SEC("tc")
+/* test that workqueues can be used from a hashmap
+ */
+__retval(0)
+long test_call_hash_sleepable(void *ctx)
+{
+ int key = 2;
+
+ return test_hmap_elem_callback(&hmap, &key);
+}
+
+SEC("tc")
+/* test that workqueues can be used from a hashmap
+ * with NO_PREALLOC.
+ */
+__retval(0)
+long test_call_hash_malloc_sleepable(void *ctx)
+{
+ int key = 3;
+
+ return test_hmap_elem_callback(&hmap_malloc, &key);
+}
+
+SEC("tc")
+/* test that workqueues can be used from a LRU map
+ */
+__retval(0)
+long test_call_lru_sleepable(void *ctx)
+{
+ int key = 4;
+
+ return test_elem_callback(&lru, &key);
+}
--
2.44.0
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