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Message-ID: <d1361cc9104390c1d5971e4618934dbe942fae92.camel@kernel.org>
Date: Sat, 11 May 2024 09:42:30 +0800
From: Geliang Tang <geliang@...nel.org>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>, Matthieu Baerts
<matttbe@...nel.org>
Cc: MPTCP Upstream <mptcp@...ts.linux.dev>, Mat Martineau
<martineau@...nel.org>, Andrii Nakryiko <andrii@...nel.org>, Eduard
Zingerman <eddyz87@...il.com>, Mykola Lysenko <mykolal@...com>, Alexei
Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
Martin KaFai Lau <martin.lau@...ux.dev>, Song Liu <song@...nel.org>,
Yonghong Song <yonghong.song@...ux.dev>, John Fastabend
<john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>, Stanislav
Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, Jiri Olsa
<jolsa@...nel.org>, Shuah Khan <shuah@...nel.org>, LKML
<linux-kernel@...r.kernel.org>, Network Development
<netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>, "open list:KERNEL
SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>, Geliang Tang
<tanggeliang@...inos.cn>
Subject: Re: [PATCH bpf-next 2/4] selftests/bpf: Add RUN_MPTCP_TEST macro
On Tue, 2024-05-07 at 13:51 -0700, Alexei Starovoitov wrote:
> On Tue, May 7, 2024 at 9:02 AM Matthieu Baerts <matttbe@...nel.org>
> wrote:
> >
> > Hi Alexei,
> >
> > Thank you for the review!
> >
> > On 07/05/2024 16:44, Alexei Starovoitov wrote:
> > > On Tue, May 7, 2024 at 3:53 AM Matthieu Baerts (NGI0)
> > > <matttbe@...nel.org> wrote:
> > > >
> > > > From: Geliang Tang <tanggeliang@...inos.cn>
> > > >
> > > > Each MPTCP subtest tests test__start_subtest(suffix), then
> > > > invokes
> > > > test_suffix(). It makes sense to add a new macro RUN_MPTCP_TEST
> > > > to
> > > > simpolify the code.
> > > >
> > > > Signed-off-by: Geliang Tang <tanggeliang@...inos.cn>
> > > > Reviewed-by: Mat Martineau <martineau@...nel.org>
> > > > Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
> > > > ---
> > > > tools/testing/selftests/bpf/prog_tests/mptcp.c | 12 ++++++++--
> > > > --
> > > > 1 file changed, 8 insertions(+), 4 deletions(-)
> > > >
> > > > diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c
> > > > b/tools/testing/selftests/bpf/prog_tests/mptcp.c
> > > > index baf976a7a1dd..9d1b255bb654 100644
> > > > --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c
> > > > +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c
> > > > @@ -347,10 +347,14 @@ static void test_mptcpify(void)
> > > > close(cgroup_fd);
> > > > }
> > > >
> > > > +#define RUN_MPTCP_TEST(suffix)
> > > > \
> > > > +do {
> > > > \
> > > > + if (test__start_subtest(#suffix))
> > > > \
> > > > + test_##suffix();
> > > > \
> > > > +} while (0)
> > >
> > > Please no.
> > > Don't hide it behind macros.
> >
> > I understand, I'm personally not a big fan of hiding code being a
> > macro
> > too. This one saves only one line. Geliang added a few more tests
> > in our
> > tree [1], for a total of 9, so that's only saving 9 lines.
> >
> > Related to that, if you don't mind, Geliang also added another
> > macro --
> > MPTCP_SCHED_TEST -- for tests that are currently only in our tree
> > [2]
> > (not ready yet). We asked him to reduce the size of this macro to
> > the
> > minimum. We accepted it because it removed quite a lot of similar
> > code
> > with very small differences [3]. Do you think we should revert this
> > modification too?
>
> Yeah. Pls don't hide such things in macros.
> Refactor into helper function in normal C.
I do agree to remove this RUN_MPTCP_TEST macro. But MPTCP_SCHED_TEST
macro is different. I know this type of macro is unwelcome. But it's
indeed a perfect place to use macro in MPTCP bpf sched tests.
From
'''
static void test_first(void)
{
struct mptcp_bpf_first *skel;
skel = mptcp_bpf_first__open_and_load();
if (!ASSERT_OK_PTR(skel, "open_and_load: first"))
return;
test_bpf_sched(skel->obj, "first", WITH_DATA, WITHOUT_DATA);
mptcp_bpf_first__destroy(skel);
}
static void test_bkup(void)
{
struct mptcp_bpf_bkup *skel;
skel = mptcp_bpf_bkup__open_and_load();
if (!ASSERT_OK_PTR(skel, "open_and_load: bkup"))
return;
test_bpf_sched(skel->obj, "bkup", WITH_DATA, WITHOUT_DATA);
mptcp_bpf_bkup__destroy(skel);
}
static void test_rr(void)
{
struct mptcp_bpf_rr *skel;
skel = mptcp_bpf_rr__open_and_load();
if (!ASSERT_OK_PTR(skel, "open_and_load: rr"))
return;
test_bpf_sched(skel->obj, "rr", WITH_DATA, WITH_DATA);
mptcp_bpf_rr__destroy(skel);
}
static void test_red(void)
{
struct mptcp_bpf_red *skel;
skel = mptcp_bpf_red__open_and_load();
if (!ASSERT_OK_PTR(skel, "open_and_load: red"))
return;
test_bpf_sched(skel->obj, "red", WITH_DATA, WITH_DATA);
mptcp_bpf_red__destroy(skel);
}
static void test_burst(void)
{
struct mptcp_bpf_burst *skel;
skel = mptcp_bpf_burst__open_and_load();
if (!ASSERT_OK_PTR(skel, "open_and_load: burst"))
return;
test_bpf_sched(skel->obj, "burst", WITH_DATA, WITH_DATA);
mptcp_bpf_burst__destroy(skel);
}
static void test_stale(void)
{
struct mptcp_bpf_stale *skel;
skel = mptcp_bpf_stale__open_and_load();
if (!ASSERT_OK_PTR(skel, "open_and_load: stale"))
return;
test_bpf_sched(skel->obj, "stale", WITH_DATA, WITHOUT_DATA);
mptcp_bpf_stale__destroy(skel);
}
'''
to
'''
#define MPTCP_SCHED_TEST(sched, addr1, addr2) \
static void test_##sched(void) \
{ \
struct mptcp_bpf_##sched *skel; \
\
skel = mptcp_bpf_##sched##__open_and_load(); \
if (!ASSERT_OK_PTR(skel, "open_and_load:" #sched)) \
return; \
\
test_bpf_sched(skel->obj, #sched, addr1, addr2); \
mptcp_bpf_##sched##__destroy(skel); \
}
MPTCP_SCHED_TEST(first, WITH_DATA, WITHOUT_DATA);
MPTCP_SCHED_TEST(bkup, WITH_DATA, WITHOUT_DATA);
MPTCP_SCHED_TEST(rr, WITH_DATA, WITH_DATA);
MPTCP_SCHED_TEST(red, WITH_DATA, WITH_DATA);
MPTCP_SCHED_TEST(burst, WITH_DATA, WITH_DATA);
MPTCP_SCHED_TEST(stale, WITH_DATA, WITHOUT_DATA);
'''
We can save so many code, and perfectly use BPF test skeleton template.
It's small enough, and be difficult to refactor with a helper function
in normal C.
Please reconsider whether to delete it, or at least keep it until the
day it is officially sent to BPF mail list for review.
Thanks,
-Geliang
>
> But, what do you mean "in your tree" ?
> That's your development tree and you plan to send all that
> properly as patches to bpf-next someday?
>
> >
> > [1]
> > https://github.com/multipath-tcp/mptcp_net-next/blob/4369d9cbd752e166961ac0db7f85886111606301/tools/testing/selftests/bpf/prog_tests/mptcp.c#L578-L595
> >
> > [2]
> > https://github.com/multipath-tcp/mptcp_net-next/blob/4369d9cbd752e166961ac0db7f85886111606301/tools/testing/selftests/bpf/prog_tests/mptcp.c#L559-L576
> >
> > [3]
> > https://lore.kernel.org/mptcp/cover.1713321357.git.tanggeliang@kylinos.cn/T/#m0b9c14f1cbae8653c6fd119f6b71d1797961d6ba
> >
> > Cheers,
> > Matt
> > --
> > Sponsored by the NGI0 Core fund.
> >
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