On Wed, Feb 2, 2022 at 5:54 AM Jiri Olsa <jolsa@xxxxxxxxxx> wrote:
>
> Adding bpf_cookie test for kprobe attached by fprobe link.
>
> Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
> ---
> .../selftests/bpf/prog_tests/bpf_cookie.c | 73 +++++++++++++++++++
> .../selftests/bpf/progs/fprobe_bpf_cookie.c | 62 ++++++++++++++++
> 2 files changed, 135 insertions(+)
> create mode 100644 tools/testing/selftests/bpf/progs/fprobe_bpf_cookie.c
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c b/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
> index cd10df6cd0fc..bf70d859c598 100644
> --- a/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
> +++ b/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
> @@ -7,6 +7,7 @@
> #include <unistd.h>
> #include <test_progs.h>
> #include "test_bpf_cookie.skel.h"
> +#include "fprobe_bpf_cookie.skel.h"
>
> /* uprobe attach point */
> static void trigger_func(void)
> @@ -63,6 +64,76 @@ static void kprobe_subtest(struct test_bpf_cookie *skel)
> bpf_link__destroy(retlink2);
> }
>
> +static void fprobe_subtest(void)
> +{
> + DECLARE_LIBBPF_OPTS(bpf_link_create_opts, opts);
> + int err, prog_fd, link1_fd = -1, link2_fd = -1;
> + struct fprobe_bpf_cookie *skel = NULL;
> + __u32 duration = 0, retval;
> + __u64 addrs[8], cookies[8];
> +
> + skel = fprobe_bpf_cookie__open_and_load();
> + if (!ASSERT_OK_PTR(skel, "fentry_raw_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]);
> +
> + cookies[0] = 1;
> + cookies[1] = 2;
> + cookies[2] = 3;
> + cookies[3] = 4;
> + cookies[4] = 5;
> + cookies[5] = 6;
> + cookies[6] = 7;
> + cookies[7] = 8;
> +
> + opts.fprobe.addrs = (__u64) &addrs;
we should have ptr_to_u64() for test_progs, but if not, let's either
add it or it should be (__u64)(uintptr_t)&addrs. Otherwise we'll be
getting compilation warnings on some architectures.
> + opts.fprobe.cnt = 8;
> + opts.fprobe.bpf_cookies = (__u64) &cookies;
> + prog_fd = bpf_program__fd(skel->progs.test2);
> +
> + link1_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_FPROBE, &opts);
> + if (!ASSERT_GE(link1_fd, 0, "link1_fd"))
> + return;
> +
> + cookies[0] = 8;
> + cookies[1] = 7;
> + cookies[2] = 6;
> + cookies[3] = 5;
> + cookies[4] = 4;
> + cookies[5] = 3;
> + cookies[6] = 2;
> + cookies[7] = 1;
> +
> + opts.flags = BPF_F_FPROBE_RETURN;
> + prog_fd = bpf_program__fd(skel->progs.test3);
> +
> + link2_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_FPROBE, &opts);
> + if (!ASSERT_GE(link2_fd, 0, "link2_fd"))
> + 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:
> + close(link1_fd);
> + close(link2_fd);
> + fprobe_bpf_cookie__destroy(skel);
> +}
> +
> static void uprobe_subtest(struct test_bpf_cookie *skel)
> {
> DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, opts);
> @@ -249,6 +320,8 @@ void test_bpf_cookie(void)
>
> if (test__start_subtest("kprobe"))
> kprobe_subtest(skel);
> + if (test__start_subtest("rawkprobe"))
kprobe.multi?
> + fprobe_subtest();
> if (test__start_subtest("uprobe"))
> uprobe_subtest(skel);
> if (test__start_subtest("tracepoint"))
[...]
