linux-kernel - Re: [PATCH bpf-next v4 5/6] selftests/bpf: Fix error failure of case test_xdp_adjust_tail

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Date:   Thu, 13 Oct 2022 09:45:02 +0800
From:   Xu Kuohai <xukuohai@...wei.com>
To:     Martin KaFai Lau <martin.lau@...ux.dev>,
        Xu Kuohai <xukuohai@...weicloud.com>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        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>, Jiri Olsa <jolsa@...nel.org>,
        Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        Alan Maguire <alan.maguire@...cle.com>,
        Delyan Kratunov <delyank@...com>,
        Lorenzo Bianconi <lorenzo@...nel.org>, <bpf@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
        <netdev@...r.kernel.org>
Subject: Re: [PATCH bpf-next v4 5/6] selftests/bpf: Fix error failure of case
 test_xdp_adjust_tail_grow

On 10/13/2022 7:17 AM, Martin KaFai Lau wrote:
> On 10/11/22 5:01 AM, Xu Kuohai wrote:
>> From: Xu Kuohai <xukuohai@...wei.com>
>>
>> test_xdp_adjust_tail_grow failed with ipv6:
>>    test_xdp_adjust_tail_grow:FAIL:ipv6 unexpected error: -28 (errno 28)
>>
>> The reason is that this test case tests ipv4 before ipv6, and when ipv4
>> test finished, topts.data_size_out was set to 54, which is smaller than the
>> ipv6 output data size 114, so ipv6 test fails with NOSPC error.
>>
>> Fix it by reset topts.data_size_out to sizeof(buf) before testing ipv6.
>>
>> Fixes: 04fcb5f9a104 ("selftests/bpf: Migrate from bpf_prog_test_run")
>> Signed-off-by: Xu Kuohai <xukuohai@...wei.com>
>> ---
>>   tools/testing/selftests/bpf/prog_tests/xdp_adjust_tail.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_adjust_tail.c b/tools/testing/selftests/bpf/prog_tests/xdp_adjust_tail.c
>> index 9b9cf8458adf..009ee37607df 100644
>> --- a/tools/testing/selftests/bpf/prog_tests/xdp_adjust_tail.c
>> +++ b/tools/testing/selftests/bpf/prog_tests/xdp_adjust_tail.c
>> @@ -63,6 +63,7 @@ static void test_xdp_adjust_tail_grow(void)
>>       expect_sz = sizeof(pkt_v6) + 40; /* Test grow with 40 bytes */
>>       topts.data_in = &pkt_v6;
>>       topts.data_size_in = sizeof(pkt_v6);
>> +    topts.data_size_out = sizeof(buf);
> 
> lgtm but how was it working before... weird.
> 

the test case returns before this line is executed, see patch 6

>>       err = bpf_prog_test_run_opts(prog_fd, &topts);
>>       ASSERT_OK(err, "ipv6");
>>       ASSERT_EQ(topts.retval, XDP_TX, "ipv6 retval");
> 
> .