linux-kernel - Re: [PATCH -next v2] bpf/benchs: Fix return value check of bpf_program_

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Date:   Mon, 1 Nov 2021 15:21:20 -0700
From:   Yonghong Song <yhs@...com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Yang Yingliang <yangyingliang@...wei.com>,
        Joanne Koong <joannekoong@...com>,
        Andrii Nakryiko <andrii@...nel.org>
CC:     LKML <linux-kernel@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, Shuah Khan <shuah@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>
Subject: Re: [PATCH -next v2] bpf/benchs: Fix return value check of
 bpf_program__attach()



On 11/1/21 3:00 PM, Alexei Starovoitov wrote:
> On Mon, Nov 1, 2021 at 5:35 AM Yang Yingliang <yangyingliang@...wei.com> wrote:
>>
>> If bpf_program__attach() fails, it never returns NULL,
>> we should use libbpf_get_error() to check the return value.
>>
>> Reported-by: Hulk Robot <hulkci@...wei.com>
>> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
>> Acked-by: Yonghong Song <yhs@...com>
>> ---
>> v2:
>>    don't use 'int err'
>> ---
>>   .../selftests/bpf/benchs/bench_bloom_filter_map.c      | 10 +++++-----
>>   1 file changed, 5 insertions(+), 5 deletions(-)
>>
>> diff --git a/tools/testing/selftests/bpf/benchs/bench_bloom_filter_map.c b/tools/testing/selftests/bpf/benchs/bench_bloom_filter_map.c
>> index 6eeeed2913e6..4afaa4adb327 100644
>> --- a/tools/testing/selftests/bpf/benchs/bench_bloom_filter_map.c
>> +++ b/tools/testing/selftests/bpf/benchs/bench_bloom_filter_map.c
>> @@ -304,7 +304,7 @@ static void bloom_lookup_setup(void)
>>          populate_maps();
>>
>>          link = bpf_program__attach(ctx.skel->progs.bloom_lookup);
>> -       if (!link) {
>> +       if (libbpf_get_error(link)) {
> 
> Please use ASSERT_OK_PTR() instead.
> See how other tests are doing it.

I actually looked at this. ASSERT_OK_PTR() is defined in test_progs.h
and test_progs.h is ONLY included in files which eventually linked to
test_progs. That is why I didn't recommend to use ASSERT_OK_PTR().

Maybe it is okay to include test_progs.h in benchs/*.c. Or we may
want to refactor to a separate header file to contain these macros
which can be used for test_progs.h and other applications.

>