From: Jiri Olsa <jolsa@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>
Cc: bpf@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
Martin KaFai Lau <kafai@fb.com>,
Eduard Zingerman <eddyz87@gmail.com>,
Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
Menglong Dong <menglong8.dong@gmail.com>,
Steven Rostedt <rostedt@kernel.org>
Subject: [RFC bpf-next 10/12] selftests/bpf: Add fentry tracing multi func test
Date: Tue, 3 Feb 2026 10:38:17 +0100 [thread overview]
Message-ID: <20260203093819.2105105-11-jolsa@kernel.org> (raw)
In-Reply-To: <20260203093819.2105105-1-jolsa@kernel.org>
Adding selftest for fentry multi func test that attaches to
bpf_fentry_test* functions and checks argument values based
on the processed function.
We need to cast to real arguments types in multi_arg_check,
because the checked value can be shorter than u64.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/testing/selftests/bpf/Makefile | 3 +-
.../selftests/bpf/prog_tests/tracing_multi.c | 48 +++++++
.../selftests/bpf/progs/tracing_multi_check.c | 132 ++++++++++++++++++
.../bpf/progs/tracing_multi_fentry.c | 17 +++
4 files changed, 199 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/bpf/prog_tests/tracing_multi.c
create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_check.c
create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_fentry.c
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index c6bf4dfb1495..b12d7b0e7828 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -481,7 +481,7 @@ SKEL_BLACKLIST := btf__% test_pinning_invalid.c test_sk_assign.c
LINKED_SKELS := test_static_linked.skel.h linked_funcs.skel.h \
linked_vars.skel.h linked_maps.skel.h \
test_subskeleton.skel.h test_subskeleton_lib.skel.h \
- test_usdt.skel.h
+ test_usdt.skel.h tracing_multi_fentry_test.skel.h
LSKELS := fexit_sleep.c trace_printk.c trace_vprintk.c map_ptr_kern.c \
core_kern.c core_kern_overflow.c test_ringbuf.c \
@@ -507,6 +507,7 @@ test_usdt.skel.h-deps := test_usdt.bpf.o test_usdt_multispec.bpf.o
xsk_xdp_progs.skel.h-deps := xsk_xdp_progs.bpf.o
xdp_hw_metadata.skel.h-deps := xdp_hw_metadata.bpf.o
xdp_features.skel.h-deps := xdp_features.bpf.o
+tracing_multi_fentry_test.skel.h-deps := tracing_multi_fentry.bpf.o tracing_multi_check.bpf.o
LINKED_BPF_OBJS := $(foreach skel,$(LINKED_SKELS),$($(skel)-deps))
LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.c,$(LINKED_BPF_OBJS))
diff --git a/tools/testing/selftests/bpf/prog_tests/tracing_multi.c b/tools/testing/selftests/bpf/prog_tests/tracing_multi.c
new file mode 100644
index 000000000000..6d45147f0730
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/tracing_multi.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <test_progs.h>
+
+#ifdef __x86_64__
+#include "tracing_multi_fentry_test.skel.h"
+#include "trace_helpers.h"
+
+static void multi_fentry_test(void)
+{
+ LIBBPF_OPTS(bpf_test_run_opts, topts);
+ struct tracing_multi_fentry_test *skel = NULL;
+ int err, prog_fd;
+
+ skel = tracing_multi_fentry_test__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "fentry_multi_skel_load"))
+ goto cleanup;
+
+ err = tracing_multi_fentry_test__attach(skel);
+ if (!ASSERT_OK(err, "fentry_attach"))
+ goto cleanup;
+
+ prog_fd = bpf_program__fd(skel->progs.test);
+ err = bpf_prog_test_run_opts(prog_fd, &topts);
+ ASSERT_OK(err, "test_run");
+
+ ASSERT_EQ(skel->bss->test_result_1, 8, "test_result");
+
+cleanup:
+ tracing_multi_fentry_test__destroy(skel);
+}
+
+void __test_tracing_multi_test(void)
+{
+ if (test__start_subtest("fentry/simple"))
+ multi_fentry_test();
+}
+#else
+void __test_tracing_multi_test(void)
+{
+ test__skip();
+}
+#endif /* __x86_64__ */
+
+void test_tracing_multi_test(void)
+{
+ __test_tracing_multi_test();
+}
diff --git a/tools/testing/selftests/bpf/progs/tracing_multi_check.c b/tools/testing/selftests/bpf/progs/tracing_multi_check.c
new file mode 100644
index 000000000000..e5efa9884dfd
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/tracing_multi_check.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+extern const void bpf_fentry_test1 __ksym;
+extern const void bpf_fentry_test2 __ksym;
+extern const void bpf_fentry_test3 __ksym;
+extern const void bpf_fentry_test4 __ksym;
+extern const void bpf_fentry_test5 __ksym;
+extern const void bpf_fentry_test6 __ksym;
+extern const void bpf_fentry_test7 __ksym;
+extern const void bpf_fentry_test8 __ksym;
+
+void multi_arg_check(__u64 *ctx, __u64 *test_result)
+{
+ void *ip = (void *) bpf_get_func_ip(ctx);
+ __u64 value = 0;
+
+ if (ip == &bpf_fentry_test1) {
+ int a;
+
+ if (bpf_get_func_arg(ctx, 0, &value))
+ return;
+ a = (int) value;
+
+ *test_result += a == 1;
+ } else if (ip == &bpf_fentry_test2) {
+ __u64 b;
+ int a;
+
+ if (bpf_get_func_arg(ctx, 0, &value))
+ return;
+ a = (int) value;
+ if (bpf_get_func_arg(ctx, 1, &value))
+ return;
+ b = value;
+
+ *test_result += a == 2 && b == 3;
+ } else if (ip == &bpf_fentry_test3) {
+ char a, b;
+ __u64 c;
+
+ if (bpf_get_func_arg(ctx, 0, &value))
+ return;
+ a = (int) value;
+ if (bpf_get_func_arg(ctx, 1, &value))
+ return;
+ b = (int) value;
+ if (bpf_get_func_arg(ctx, 2, &value))
+ return;
+ c = value;
+
+ *test_result += a == 4 && b == 5 && c == 6;
+ } else if (ip == &bpf_fentry_test4) {
+ void *a;
+ char b;
+ int c;
+ __u64 d;
+
+ if (bpf_get_func_arg(ctx, 0, &value))
+ return;
+ a = (void*) value;
+ if (bpf_get_func_arg(ctx, 1, &value))
+ return;
+ b = (char) value;
+ if (bpf_get_func_arg(ctx, 2, &value))
+ return;
+ c = (int) value;
+ if (bpf_get_func_arg(ctx, 3, &value))
+ return;
+ d = value;
+
+ *test_result += a == (void *) 7 && b == 8 && c == 9 && d == 10;
+ } else if (ip == &bpf_fentry_test5) {
+ __u64 a;
+ void *b;
+ short c;
+ int d;
+ __u64 e;
+
+ if (bpf_get_func_arg(ctx, 0, &value))
+ return;
+ a = value;
+ if (bpf_get_func_arg(ctx, 1, &value))
+ return;
+ b = (void*) value;
+ if (bpf_get_func_arg(ctx, 2, &value))
+ return;
+ c = (short) value;
+ if (bpf_get_func_arg(ctx, 3, &value))
+ return;
+ d = (int) value;
+ if (bpf_get_func_arg(ctx, 4, &value))
+ return;
+ e = value;
+
+ *test_result += a == 11 && b == (void *) 12 && c == 13 && d == 14 && e == 15;
+ } else if (ip == &bpf_fentry_test6) {
+ __u64 a;
+ void *b;
+ short c;
+ int d;
+ void *e;
+ __u64 f;
+
+ if (bpf_get_func_arg(ctx, 0, &value))
+ return;
+ a = value;
+ if (bpf_get_func_arg(ctx, 1, &value))
+ return;
+ b = (void*) value;
+ if (bpf_get_func_arg(ctx, 2, &value))
+ return;
+ c = (short) value;
+ if (bpf_get_func_arg(ctx, 3, &value))
+ return;
+ d = (int) value;
+ if (bpf_get_func_arg(ctx, 4, &value))
+ return;
+ e = (void*) value;;
+ if (bpf_get_func_arg(ctx, 5, &value))
+ return;
+ f = value;;
+
+ *test_result += a == 16 && b == (void *) 17 && c == 18 && d == 19 && e == (void *) 20 && f == 21;
+ } else if (ip == &bpf_fentry_test7) {
+ *test_result += 1;
+ } else if (ip == &bpf_fentry_test8) {
+ *test_result += 1;
+ }
+}
diff --git a/tools/testing/selftests/bpf/progs/tracing_multi_fentry.c b/tools/testing/selftests/bpf/progs/tracing_multi_fentry.c
new file mode 100644
index 000000000000..628734596114
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/tracing_multi_fentry.c
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+char _license[] SEC("license") = "GPL";
+
+__u64 test_result_1 = 0;
+
+__hidden extern void multi_arg_check(__u64 *ctx, __u64 *test_result);
+
+SEC("fentry.multi/bpf_fentry_test*")
+int BPF_PROG(test, __u64 a, __u64 b, __u64 c, __u64 d, __u64 e, __u64 f)
+{
+ multi_arg_check(ctx, &test_result_1);
+ return 0;
+}
--
2.52.0
next prev parent reply other threads:[~2026-02-03 9:40 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-03 9:38 [RFC bpf-next 00/12] bpf: tracing_multi link Jiri Olsa
2026-02-03 9:38 ` [RFC bpf-next 01/12] ftrace: Add ftrace_hash_count function Jiri Olsa
2026-02-03 15:40 ` Steven Rostedt
2026-02-04 12:06 ` Jiri Olsa
2026-02-03 9:38 ` [RFC bpf-next 02/12] bpf: Add struct bpf_trampoline_ops object Jiri Olsa
2026-02-03 9:38 ` [RFC bpf-next 03/12] bpf: Add struct bpf_struct_ops_tramp_link object Jiri Olsa
2026-02-03 9:38 ` [RFC bpf-next 04/12] bpf: Add struct bpf_tramp_node object Jiri Olsa
2026-02-04 19:00 ` Andrii Nakryiko
2026-02-05 8:57 ` Jiri Olsa
2026-02-05 22:27 ` Andrii Nakryiko
2026-02-06 8:27 ` Jiri Olsa
2026-02-03 9:38 ` [RFC bpf-next 05/12] bpf: Add multi tracing attach types Jiri Olsa
2026-02-03 10:13 ` bot+bpf-ci
2026-02-17 22:05 ` Jiri Olsa
2026-02-04 2:20 ` Leon Hwang
2026-02-04 12:41 ` Jiri Olsa
2026-02-03 9:38 ` [RFC bpf-next 06/12] bpf: Add bpf_trampoline_multi_attach/detach functions Jiri Olsa
2026-02-03 10:14 ` bot+bpf-ci
2026-02-17 22:05 ` Jiri Olsa
2026-02-05 9:16 ` Menglong Dong
2026-02-05 13:45 ` Jiri Olsa
2026-02-11 8:04 ` Menglong Dong
2026-02-03 9:38 ` [RFC bpf-next 07/12] bpf: Add support to create tracing multi link Jiri Olsa
2026-02-03 10:13 ` bot+bpf-ci
2026-02-17 22:05 ` Jiri Olsa
2026-02-04 19:05 ` Andrii Nakryiko
2026-02-05 8:55 ` Jiri Olsa
2026-02-03 9:38 ` [RFC bpf-next 08/12] libbpf: Add btf__find_by_glob_kind function Jiri Olsa
2026-02-03 10:14 ` bot+bpf-ci
2026-02-04 19:04 ` Andrii Nakryiko
2026-02-05 8:57 ` Jiri Olsa
2026-02-05 22:45 ` Andrii Nakryiko
2026-02-06 8:43 ` Jiri Olsa
2026-02-06 16:58 ` Andrii Nakryiko
2026-02-03 9:38 ` [RFC bpf-next 09/12] libbpf: Add support to create tracing multi link Jiri Olsa
2026-02-03 10:14 ` bot+bpf-ci
2026-02-17 22:05 ` Jiri Olsa
2026-02-04 19:05 ` Andrii Nakryiko
2026-02-17 22:06 ` Jiri Olsa
2026-02-03 9:38 ` Jiri Olsa [this message]
2026-02-03 10:13 ` [RFC bpf-next 10/12] selftests/bpf: Add fentry tracing multi func test bot+bpf-ci
2026-02-17 22:06 ` Jiri Olsa
2026-02-03 9:38 ` [RFC bpf-next 11/12] selftests/bpf: Add fentry intersected " Jiri Olsa
2026-02-03 9:38 ` [RFC bpf-next 12/12] selftests/bpf: Add tracing multi benchmark test Jiri Olsa
2026-02-03 10:13 ` bot+bpf-ci
2026-02-17 22:06 ` Jiri Olsa
2026-02-03 23:17 ` [RFC bpf-next 00/12] bpf: tracing_multi link Alexei Starovoitov
2026-02-04 12:36 ` Jiri Olsa
2026-02-04 16:06 ` Alexei Starovoitov
2026-02-05 8:55 ` Jiri Olsa
2026-02-05 15:55 ` Alexei Starovoitov
2026-02-06 8:18 ` Jiri Olsa
2026-02-06 17:03 ` Andrii Nakryiko
2026-02-08 20:54 ` Jiri Olsa
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