netdev - Re: [PATCH v3 bpf-next 2/3] selftests/bpf: add variable-length data concatenation pattern test

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Date:   Tue, 23 Jun 2020 13:52:24 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Andrii Nakryiko <andriin@...com>, bpf <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        john fastabend <john.fastabend@...il.com>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH v3 bpf-next 2/3] selftests/bpf: add variable-length data
 concatenation pattern test

On Tue, Jun 23, 2020 at 1:39 PM Daniel Borkmann <daniel@...earbox.net> wrote:
>
> Hey Andrii,
>
> On 6/23/20 5:22 AM, Andrii Nakryiko wrote:
> > Add selftest that validates variable-length data reading and concatentation
> > with one big shared data array. This is a common pattern in production use for
> > monitoring and tracing applications, that potentially can read a lot of data,
> > but overall read much less. Such pattern allows to determine precisely what
> > amount of data needs to be sent over perfbuf/ringbuf and maximize efficiency.
> >
> > Signed-off-by: Andrii Nakryiko <andriin@...com>
>
> Currently getting the below errors on these tests. My last clang/llvm git build
> is on 4676cf444ea2 ("[Clang] Skip adding begin source location for PragmaLoopHint'd
> loop when[...]"):
>

Yeah, you need 02553b91da5d ("bpf: bpf_probe_read_kernel_str() has to
return amount of data read on success") from bpf tree.

I'm eagerly awaiting bpf being merged into bpf-next :)

> # ./test_progs -t varlen
> test_varlen:PASS:skel_open 0 nsec
> test_varlen:PASS:skel_attach 0 nsec
> test_varlen:FAIL:check got 0 != exp 8
> test_varlen:FAIL:check got 0 != exp 7
> test_varlen:FAIL:check got 0 != exp 15
> test_varlen:FAIL:content_check doesn't match!test_varlen:FAIL:check got 0 != exp 8
> test_varlen:FAIL:check got 0 != exp 7
> test_varlen:FAIL:check got 0 != exp 15
> test_varlen:FAIL:content_check doesn't match!test_varlen:FAIL:check got 0 != exp 8
> test_varlen:FAIL:check got 0 != exp 7
> test_varlen:FAIL:check got 0 != exp 15
> test_varlen:FAIL:content_check doesn't match!test_varlen:FAIL:check got 0 != exp 8
> test_varlen:FAIL:check got 0 != exp 7
> test_varlen:FAIL:check got 0 != exp 15
> test_varlen:FAIL:content_check doesn't match!
> #87 varlen:FAIL
> Summary: 0/0 PASSED, 0 SKIPPED, 1 FAILED
>
> # ./test_progs-no_alu32 -t varlen
> Switching to flavor 'no_alu32' subdirectory...
> test_varlen:PASS:skel_open 0 nsec
> test_varlen:PASS:skel_attach 0 nsec
> test_varlen:FAIL:check got 0 != exp 8
> test_varlen:FAIL:check got 0 != exp 7
> test_varlen:FAIL:check got 0 != exp 15
> test_varlen:FAIL:content_check doesn't match!test_varlen:FAIL:check got 0 != exp 8
> test_varlen:FAIL:check got 0 != exp 7
> test_varlen:FAIL:check got 0 != exp 15
> test_varlen:FAIL:content_check doesn't match!test_varlen:FAIL:check got 0 != exp 8
> test_varlen:FAIL:check got 0 != exp 7
> test_varlen:FAIL:check got 0 != exp 15
> test_varlen:FAIL:content_check doesn't match!test_varlen:FAIL:check got 0 != exp 8
> test_varlen:FAIL:check got 0 != exp 7
> test_varlen:FAIL:check got 0 != exp 15
> test_varlen:FAIL:content_check doesn't match!
> #87 varlen:FAIL
> Summary: 0/0 PASSED, 0 SKIPPED, 1 FAILED
>
> Thanks,
> Daniel