Commit 56dda5a4 authored by Jiri Olsa's avatar Jiri Olsa Committed by Alexei Starovoitov
Browse files

selftests/bpf: Add re-attach test to fentry_test 



Adding the test to re-attach (detach/attach again) tracing
fentry programs, plus check that already linked program can't
be attached again.

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210414195147.1624932-4-jolsa@kernel.org
parent f3a95075

tools/testing/selftests/bpf/prog_tests/fentry_test.c

+37 −15
Original line number Diff line number Diff line
@@ -3,35 +3,57 @@ 
#include <test_progs.h>

#include "fentry_test.skel.h"



void test_fentry_test(void)

static int fentry_test(struct fentry_test *fentry_skel)

{

	struct fentry_test *fentry_skel = NULL;

	int err, prog_fd, i;

	__u32 duration = 0, retval;

	struct bpf_link *link;

	__u64 *result;



	fentry_skel = fentry_test__open_and_load();

	if (CHECK(!fentry_skel, "fentry_skel_load", "fentry skeleton failed\n"))

		goto cleanup;



	err = fentry_test__attach(fentry_skel);

	if (CHECK(err, "fentry_attach", "fentry attach failed: %d\n", err))

		goto cleanup;

	if (!ASSERT_OK(err, "fentry_attach"))

		return err;



	/* Check that already linked program can't be attached again. */

	link = bpf_program__attach(fentry_skel->progs.test1);

	if (!ASSERT_ERR_PTR(link, "fentry_attach_link"))

		return -1;



	prog_fd = bpf_program__fd(fentry_skel->progs.test1);

	err = bpf_prog_test_run(prog_fd, 1, NULL, 0,

				NULL, NULL, &retval, &duration);

	CHECK(err || retval, "test_run",

	      "err %d errno %d retval %d duration %d\n",

	      err, errno, retval, duration);

	ASSERT_OK(err, "test_run");

	ASSERT_EQ(retval, 0, "test_run");



	result = (__u64 *)fentry_skel->bss;

	for (i = 0; i < 6; i++) {

		if (CHECK(result[i] != 1, "result",

			  "fentry_test%d failed err %lld\n", i + 1, result[i]))

			goto cleanup;

	for (i = 0; i < sizeof(*fentry_skel->bss) / sizeof(__u64); i++) {

		if (!ASSERT_EQ(result[i], 1, "fentry_result"))

			return -1;

	}



	fentry_test__detach(fentry_skel);



	/* zero results for re-attach test */

	memset(fentry_skel->bss, 0, sizeof(*fentry_skel->bss));

	return 0;

}



void test_fentry_test(void)

{

	struct fentry_test *fentry_skel = NULL;

	int err;



	fentry_skel = fentry_test__open_and_load();

	if (!ASSERT_OK_PTR(fentry_skel, "fentry_skel_load"))

		goto cleanup;



	err = fentry_test(fentry_skel);

	if (!ASSERT_OK(err, "fentry_first_attach"))

		goto cleanup;



	err = fentry_test(fentry_skel);

	ASSERT_OK(err, "fentry_second_attach");



cleanup:

	fentry_test__destroy(fentry_skel);

}