On Tue, Apr 13, 2021 at 02:54:10PM -0700, Andrii Nakryiko wrote:
SNIP
> > __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 || retval, "test_run");
>
> this is quite misleading, even if will result in a correct check. Toke
> did this in his patch set:
>
> ASSERT_OK(err, ...);
> ASSERT_EQ(retval, 0, ...);
>
> It is a better and more straightforward way to validate the checks
> instead of relying on (err || retval) -> bool (true) -> int (1) -> !=
> 0 chain.
ok, makes sense
SNIP
> > +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);
> > }
> > diff --git a/tools/testing/selftests/bpf/test_progs.h b/tools/testing/selftests/bpf/test_progs.h
> > index e87c8546230e..ee7e3b45182a 100644
> > --- a/tools/testing/selftests/bpf/test_progs.h
> > +++ b/tools/testing/selftests/bpf/test_progs.h
> > @@ -210,7 +210,7 @@ extern int test__join_cgroup(const char *path);
> > #define ASSERT_ERR_PTR(ptr, name) ({ \
> > static int duration = 0; \
> > const void *___res = (ptr); \
> > - bool ___ok = IS_ERR(___res) \
> > + bool ___ok = IS_ERR(___res); \
>
> heh, it probably deserves a separate patch with Fixes tag...
va bene
jirka
