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Message-ID: <CADxym3YhoNcsPzHLzW0XBLtTW0KjTF4YViAwmboeYyS1cwMwaQ@mail.gmail.com>
Date: Wed, 12 Jul 2023 23:11:43 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc: Yonghong Song <yhs@...a.com>,
Daniel Borkmann <daniel@...earbox.net>,
Alexei Starovoitov <ast@...nel.org>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <martin.lau@...ux.dev>,
Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>,
Stanislav Fomichev <sdf@...gle.com>,
Hao Luo <haoluo@...gle.com>, David Ahern <dsahern@...nel.org>,
Jiri Olsa <jolsa@...nel.org>, X86 ML <x86@...nel.org>,
bpf <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
Menglong Dong <imagedong@...cent.com>
Subject: Re: [PATCH bpf-next v9 3/3] selftests/bpf: add testcase for TRACING
with 6+ arguments
On Wed, Jul 12, 2023 at 10:54 PM Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
>
> On Wed, Jul 12, 2023 at 1:50 AM <menglong8.dong@...il.com> wrote:
> >
> > From: Menglong Dong <imagedong@...cent.com>
> >
> > Add fentry_many_args.c and fexit_many_args.c to test the fentry/fexit
> > with 7/11 arguments. As this feature is not supported by arm64 yet, we
> > disable these testcases for arm64 in DENYLIST.aarch64. We can combine
> > them with fentry_test.c/fexit_test.c when arm64 is supported too.
> >
> > Correspondingly, add bpf_testmod_fentry_test7() and
> > bpf_testmod_fentry_test11() to bpf_testmod.c
> >
> > Meanwhile, add bpf_modify_return_test2() to test_run.c to test the
> > MODIFY_RETURN with 7 arguments.
> >
> > Add bpf_testmod_test_struct_arg_7/bpf_testmod_test_struct_arg_7 in
> > bpf_testmod.c to test the struct in the arguments.
> >
> > And the testcases passed on x86_64:
> >
> > ./test_progs -t fexit
> > Summary: 5/14 PASSED, 0 SKIPPED, 0 FAILED
> >
> > ./test_progs -t fentry
> > Summary: 3/2 PASSED, 0 SKIPPED, 0 FAILED
> >
> > ./test_progs -t modify_return
> > Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED
> >
> > ./test_progs -t tracing_struct
> > Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED
> >
> > Signed-off-by: Menglong Dong <imagedong@...cent.com>
> > Acked-by: Yonghong Song <yhs@...com>
> > ---
> > v9:
> > - change the way to test fmod_ret
> > v8:
> > - split the testcases, and add fentry_many_args/fexit_many_args to
> > DENYLIST.aarch64
> > v6:
> > - add testcases to tracing_struct.c instead of fentry_test.c and
> > fexit_test.c
> > v5:
> > - add testcases for MODIFY_RETURN
> > v4:
> > - use different type for args in bpf_testmod_fentry_test{7,12}
> > - add testcase for grabage values in ctx
> > v3:
> > - move bpf_fentry_test{7,12} to bpf_testmod.c and rename them to
> > bpf_testmod_fentry_test{7,12} meanwhile
> > - get return value by bpf_get_func_ret() in
> > "fexit/bpf_testmod_fentry_test12", as we don't change ___bpf_ctx_cast()
> > in this version
> > ---
> > net/bpf/test_run.c | 14 ++++-
> > tools/testing/selftests/bpf/DENYLIST.aarch64 | 2 +
> > .../selftests/bpf/bpf_testmod/bpf_testmod.c | 49 ++++++++++++++++-
> > .../selftests/bpf/prog_tests/fentry_test.c | 43 +++++++++++++--
> > .../selftests/bpf/prog_tests/fexit_test.c | 43 +++++++++++++--
> > .../selftests/bpf/prog_tests/modify_return.c | 10 ++--
> > .../selftests/bpf/prog_tests/tracing_struct.c | 19 +++++++
> > .../selftests/bpf/progs/fentry_many_args.c | 39 ++++++++++++++
> > .../selftests/bpf/progs/fexit_many_args.c | 40 ++++++++++++++
> > .../selftests/bpf/progs/modify_return.c | 40 ++++++++++++++
> > .../selftests/bpf/progs/tracing_struct.c | 54 +++++++++++++++++++
> > 11 files changed, 340 insertions(+), 13 deletions(-)
> > create mode 100644 tools/testing/selftests/bpf/progs/fentry_many_args.c
> > create mode 100644 tools/testing/selftests/bpf/progs/fexit_many_args.c
> >
> > diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
> > index 63b11f7a5392..7d47f53f20c1 100644
> > --- a/net/bpf/test_run.c
> > +++ b/net/bpf/test_run.c
> > @@ -565,6 +565,13 @@ __bpf_kfunc int bpf_modify_return_test(int a, int *b)
> > return a + *b;
> > }
> >
> > +__bpf_kfunc int bpf_modify_return_test2(int a, int *b, short c, int d,
> > + void *e, char f, int g)
> > +{
> > + *b += 1;
> > + return a + *b + c + d + (long)e + f + g;
> > +}
> > +
> > int noinline bpf_fentry_shadow_test(int a)
> > {
> > return a + 1;
> > @@ -600,6 +607,7 @@ __diag_pop();
> >
> > BTF_SET8_START(bpf_test_modify_return_ids)
> > BTF_ID_FLAGS(func, bpf_modify_return_test)
> > +BTF_ID_FLAGS(func, bpf_modify_return_test2)
> > BTF_ID_FLAGS(func, bpf_fentry_test1, KF_SLEEPABLE)
> > BTF_SET8_END(bpf_test_modify_return_ids)
> >
> > @@ -667,7 +675,11 @@ int bpf_prog_test_run_tracing(struct bpf_prog *prog,
> > case BPF_MODIFY_RETURN:
> > ret = bpf_modify_return_test(1, &b);
> > if (b != 2)
> > - side_effect = 1;
> > + side_effect++;
> > + b = 2;
> > + ret += bpf_modify_return_test2(1, &b, 3, 4, (void *)5, 6, 7);
> > + if (b != 2)
> > + side_effect++;
>
> Looks better, but now two tests are failing:
> Error: #85 get_func_args_test
> Error: #252 trampoline_count
>
> See BPF CI.
>
> I suspect you haven't rerun the whole test_progs after your changes.
> Please do so in the future.
......Yes, I didn't run the whole tests, and it seems that
some other test cases also use the bpf_modify_return_test().
I'll run the whole test_progs, sorry for the bother......
Thanks!
Menglong Dong
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