selftests/bpf: Add serial_test_kprobe_multi_bench_attach_kernel/module tests

Add bench test for module portion of the symbols as well.

  # ./test_progs -v -t kprobe_multi_bench_attach_module
  bpf_testmod.ko is already unloaded.
  Loading bpf_testmod.ko...
  Successfully loaded bpf_testmod.ko.
  test_kprobe_multi_bench_attach:PASS:get_syms 0 nsec
  test_kprobe_multi_bench_attach:PASS:kprobe_multi_empty__open_and_load 0 nsec
  test_kprobe_multi_bench_attach:PASS:bpf_program__attach_kprobe_multi_opts 0 nsec
  test_kprobe_multi_bench_attach: found 26620 functions
  test_kprobe_multi_bench_attach: attached in   0.182s
  test_kprobe_multi_bench_attach: detached in   0.082s
  #96      kprobe_multi_bench_attach_module:OK
  Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED
  Successfully unloaded bpf_testmod.ko.

It's useful for testing kprobe multi link modules resolving.

Acked-by: Song Liu <song@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20230116101009.23694-3-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
index c6f37e8..113dba3 100644 (file)
--- a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
@@ -322,7 +322,7 @@ static bool symbol_equal(long key1, long key2, void *ctx __maybe_unused)
        return strcmp((const char *) key1, (const char *) key2) == 0;
 }
 
-static int get_syms(char ***symsp, size_t *cntp)
+static int get_syms(char ***symsp, size_t *cntp, bool kernel)
 {
        size_t cap = 0, cnt = 0, i;
        char *name = NULL, **syms = NULL;
@@ -349,8 +349,9 @@ static int get_syms(char ***symsp, size_t *cntp)
        }
 
        while (fgets(buf, sizeof(buf), f)) {
-               /* skip modules */
-               if (strchr(buf, '['))
+               if (kernel && strchr(buf, '['))
+                       continue;
+               if (!kernel && !strchr(buf, '['))
                        continue;
 
                free(name);
@@ -404,7 +405,7 @@ error:
        return err;
 }
 
-void serial_test_kprobe_multi_bench_attach(void)
+static void test_kprobe_multi_bench_attach(bool kernel)
 {
        LIBBPF_OPTS(bpf_kprobe_multi_opts, opts);
        struct kprobe_multi_empty *skel = NULL;
@@ -415,7 +416,7 @@ void serial_test_kprobe_multi_bench_attach(void)
        char **syms = NULL;
        size_t cnt = 0, i;
 
-       if (!ASSERT_OK(get_syms(&syms, &cnt), "get_syms"))
+       if (!ASSERT_OK(get_syms(&syms, &cnt, kernel), "get_syms"))
                return;
 
        skel = kprobe_multi_empty__open_and_load();
@@ -453,6 +454,14 @@ cleanup:
        }
 }
 
+void serial_test_kprobe_multi_bench_attach(void)
+{
+       if (test__start_subtest("kernel"))
+               test_kprobe_multi_bench_attach(true);
+       if (test__start_subtest("modules"))
+               test_kprobe_multi_bench_attach(false);
+}
+
 void test_kprobe_multi_test(void)
 {
        if (!ASSERT_OK(load_kallsyms(), "load_kallsyms"))