netdev - RE: [PATCH bpf 3/4] selftests: bpf: make reuseport test output more legible

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Date:   Fri, 24 Jan 2020 11:46:27 -0800
From:   John Fastabend <john.fastabend@...il.com>
To:     Lorenz Bauer <lmb@...udflare.com>, Shuah Khan <shuah@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>
Cc:     Lorenz Bauer <lmb@...udflare.com>, linux-kselftest@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: RE: [PATCH bpf 3/4] selftests: bpf: make reuseport test output more
 legible

Lorenz Bauer wrote:
> Include the name of the mismatching result in human readable format
> when reporting an error. The new output looks like the following:
> 
>   unexpected result
>    result: [1, 0, 0, 0, 0, 0]
>   expected: [0, 0, 0, 0, 0, 0]
>   mismatch on DROP_ERR_INNER_MAP (bpf_prog_linum:153)
>   check_results:FAIL:382
> 
> Signed-off-by: Lorenz Bauer <lmb@...udflare.com>
> ---
>  .../bpf/prog_tests/select_reuseport.c         | 30 ++++++++++++++++---
>  1 file changed, 26 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/prog_tests/select_reuseport.c b/tools/testing/selftests/bpf/prog_tests/select_reuseport.c
> index 2c37ae7dc214..09a536af139a 100644
> --- a/tools/testing/selftests/bpf/prog_tests/select_reuseport.c
> +++ b/tools/testing/selftests/bpf/prog_tests/select_reuseport.c
> @@ -316,6 +316,28 @@ static void check_data(int type, sa_family_t family, const struct cmd *cmd,
>  		       expected.len, result.len, get_linum());
>  }
>  
> +static const char *result_to_str(enum result res)
> +{
> +	switch (res) {
> +	case DROP_ERR_INNER_MAP:
> +		return "DROP_ERR_INNER_MAP";
> +	case DROP_ERR_SKB_DATA:
> +		return "DROP_ERR_SKB_DATA";
> +	case DROP_ERR_SK_SELECT_REUSEPORT:
> +		return "DROP_ERR_SK_SELECT_REUSEPORT";
> +	case DROP_MISC:
> +		return "DROP_MISC";
> +	case PASS:
> +		return "PASS";
> +	case PASS_ERR_SK_SELECT_REUSEPORT:
> +		return "PASS_ERR_SK_SELECT_REUSEPORT";
> +	case NR_RESULTS:
> +		return "NR_RESULTS";
> +	default:
> +		return "UNKNOWN";
> +	}
> +}
> +
>  static void check_results(void)
>  {
>  	__u32 results[NR_RESULTS];
> @@ -351,10 +373,10 @@ static void check_results(void)
>  		printf(", %u", expected_results[i]);
>  	printf("]\n");
>  
> -	RET_IF(expected_results[broken] != results[broken],
> -	       "unexpected result",
> -	       "expected_results[%u] != results[%u] bpf_prog_linum:%ld\n",
> -	       broken, broken, get_linum());
> +	printf("mismatch on %s (bpf_prog_linum:%ld)\n", result_to_str(broken),
> +	       get_linum());
> +
> +	CHECK_FAIL(true);
>  }
>  
>  static int send_data(int type, sa_family_t family, void *data, size_t len,
> -- 
> 2.20.1
> 

Acked-by: John Fastabend <john.fastabend@...il.com>