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Date: Wed, 24 Nov 2021 09:41:18 +0100
From: Jiri Olsa <jolsa@...hat.com>
To: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Masami Hiramatsu <mhiramat@...nel.org>,
Steven Rostedt <rostedt@...dmis.org>
Cc: netdev@...r.kernel.org, bpf@...r.kernel.org,
lkml <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Martin KaFai Lau <kafai@...com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...omium.org>,
Ravi Bangoria <ravi.bangoria@....com>
Subject: [PATCH 7/8] selftest/bpf: Add kprobe multi attach test
Adding kprobe multi attach test that uses new interface
to attach multiple probes within single perf event.
The test is attaching to bpf_fentry_test* functions and
single trampoline program to use bpf_prog_test_run to
trigger bpf_fentry_test* functions.
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
.../bpf/prog_tests/multi_kprobe_test.c | 83 +++++++++++++++++++
.../selftests/bpf/progs/multi_kprobe.c | 58 +++++++++++++
2 files changed, 141 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/multi_kprobe_test.c
create mode 100644 tools/testing/selftests/bpf/progs/multi_kprobe.c
diff --git a/tools/testing/selftests/bpf/prog_tests/multi_kprobe_test.c b/tools/testing/selftests/bpf/prog_tests/multi_kprobe_test.c
new file mode 100644
index 000000000000..4aae472f9c16
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/multi_kprobe_test.c
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+#include "multi_kprobe.skel.h"
+#include "trace_helpers.h"
+
+static void test_funcs_api(void)
+{
+ struct multi_kprobe *skel = NULL;
+ __u32 duration = 0, retval;
+ int err, prog_fd;
+
+ skel = multi_kprobe__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "fentry_multi_skel_load"))
+ goto cleanup;
+
+ err = multi_kprobe__attach(skel);
+ if (!ASSERT_OK(err, "fentry_attach"))
+ goto cleanup;
+
+ prog_fd = bpf_program__fd(skel->progs.test1);
+ err = bpf_prog_test_run(prog_fd, 1, NULL, 0,
+ NULL, NULL, &retval, &duration);
+ ASSERT_OK(err, "test_run");
+ ASSERT_EQ(retval, 0, "test_run");
+
+ ASSERT_EQ(skel->bss->test2_result, 8, "test2_result");
+ ASSERT_EQ(skel->bss->test3_result, 8, "test3_result");
+
+cleanup:
+ multi_kprobe__destroy(skel);
+}
+
+static void test_addrs_api(void)
+{
+ struct bpf_link *link1 = NULL, *link2 = NULL;
+ DECLARE_LIBBPF_OPTS(bpf_kprobe_opts, opts);
+ struct multi_kprobe *skel = NULL;
+ __u32 duration = 0, retval;
+ int err, prog_fd;
+ __u64 addrs[8];
+
+ skel = multi_kprobe__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "fentry_multi_skel_load"))
+ goto cleanup;
+
+ kallsyms_find("bpf_fentry_test1", &addrs[0]);
+ kallsyms_find("bpf_fentry_test2", &addrs[1]);
+ kallsyms_find("bpf_fentry_test3", &addrs[2]);
+ kallsyms_find("bpf_fentry_test4", &addrs[3]);
+ kallsyms_find("bpf_fentry_test5", &addrs[4]);
+ kallsyms_find("bpf_fentry_test6", &addrs[5]);
+ kallsyms_find("bpf_fentry_test7", &addrs[6]);
+ kallsyms_find("bpf_fentry_test8", &addrs[7]);
+
+ opts.multi.cnt = 8;
+ opts.multi.addrs = (__u64 *) &addrs;
+ link1 = bpf_program__attach_kprobe_opts(skel->progs.test2, NULL, &opts);
+ if (!ASSERT_OK_PTR(link1, "link1"))
+ goto cleanup;
+
+ link2 = bpf_program__attach_kprobe_opts(skel->progs.test3, NULL, &opts);
+ if (!ASSERT_OK_PTR(link1, "link1"))
+ goto cleanup;
+
+ prog_fd = bpf_program__fd(skel->progs.test1);
+ err = bpf_prog_test_run(prog_fd, 1, NULL, 0,
+ NULL, NULL, &retval, &duration);
+ ASSERT_OK(err, "test_run");
+ ASSERT_EQ(retval, 0, "test_run");
+
+ ASSERT_EQ(skel->bss->test2_result, 8, "test2_result");
+ ASSERT_EQ(skel->bss->test3_result, 8, "test3_result");
+
+cleanup:
+ bpf_link__destroy(link1);
+ bpf_link__destroy(link2);
+ multi_kprobe__destroy(skel);
+}
+void test_multi_kprobe_test(void)
+{
+ test_funcs_api();
+ test_addrs_api();
+}
diff --git a/tools/testing/selftests/bpf/progs/multi_kprobe.c b/tools/testing/selftests/bpf/progs/multi_kprobe.c
new file mode 100644
index 000000000000..67fe4c2486fc
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/multi_kprobe.c
@@ -0,0 +1,58 @@
+// 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";
+
+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;
+
+/* No tests, just to trigger bpf_fentry_test* through tracing test_run */
+SEC("fentry/bpf_modify_return_test")
+int BPF_PROG(test1)
+{
+ return 0;
+}
+
+__u64 test2_result = 0;
+
+SEC("kprobe.multi/bpf_fentry_test*")
+int test2(struct pt_regs *ctx)
+{
+ __u64 addr = bpf_get_func_ip(ctx);
+
+ test2_result += (const void *) addr == &bpf_fentry_test1 ||
+ (const void *) addr == &bpf_fentry_test2 ||
+ (const void *) addr == &bpf_fentry_test3 ||
+ (const void *) addr == &bpf_fentry_test4 ||
+ (const void *) addr == &bpf_fentry_test5 ||
+ (const void *) addr == &bpf_fentry_test6 ||
+ (const void *) addr == &bpf_fentry_test7 ||
+ (const void *) addr == &bpf_fentry_test8;
+ return 0;
+}
+
+__u64 test3_result = 0;
+
+SEC("kretprobe.multi/bpf_fentry_test*")
+int test3(struct pt_regs *ctx)
+{
+ __u64 addr = bpf_get_func_ip(ctx);
+
+ test3_result += (const void *) addr == &bpf_fentry_test1 ||
+ (const void *) addr == &bpf_fentry_test2 ||
+ (const void *) addr == &bpf_fentry_test3 ||
+ (const void *) addr == &bpf_fentry_test4 ||
+ (const void *) addr == &bpf_fentry_test5 ||
+ (const void *) addr == &bpf_fentry_test6 ||
+ (const void *) addr == &bpf_fentry_test7 ||
+ (const void *) addr == &bpf_fentry_test8;
+ return 0;
+}
--
2.33.1
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