netdev - Re: [PATCH bpf-next v3 21/21] tools/bpf: selftests: add bpf

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Date:   Fri, 8 May 2020 12:57:51 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Yonghong Song <yhs@...com>
Cc:     Andrii Nakryiko <andriin@...com>, bpf <bpf@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH bpf-next v3 21/21] tools/bpf: selftests: add bpf_iter selftests

On Wed, May 6, 2020 at 10:41 PM Yonghong Song <yhs@...com> wrote:
>
> The added test includes the following subtests:
>   - test verifier change for btf_id_or_null
>   - test load/create_iter/read for
>     ipv6_route/netlink/bpf_map/task/task_file
>   - test anon bpf iterator
>   - test anon bpf iterator reading one char at a time
>   - test file bpf iterator
>   - test overflow (single bpf program output not overflow)
>   - test overflow (single bpf program output overflows)
>   - test bpf prog returning 1
>
> The ipv6_route tests the following verifier change
>   - access fields in the variable length array of the structure.
>
> The netlink load tests the following verifier change
>   - put a btf_id ptr value in a stack and accessible to
>     tracing/iter programs.
>
> The anon bpf iterator also tests link auto attach through skeleton.
>
>   $ test_progs -n 2
>   #2/1 btf_id_or_null:OK
>   #2/2 ipv6_route:OK
>   #2/3 netlink:OK
>   #2/4 bpf_map:OK
>   #2/5 task:OK
>   #2/6 task_file:OK
>   #2/7 anon:OK
>   #2/8 anon-read-one-char:OK
>   #2/9 file:OK
>   #2/10 overflow:OK
>   #2/11 overflow-e2big:OK
>   #2/12 prog-ret-1:OK
>   #2 bpf_iter:OK
>   Summary: 1/12 PASSED, 0 SKIPPED, 0 FAILED
>
> Signed-off-by: Yonghong Song <yhs@...com>
> ---

I'm personally not a big fan of bpf_iter_test_kern_common.h approach
(including it and parameterizing with #define), I'd rather just
copy/paste BPF program code (it's just a few lines) and maybe even put
them in the same file/skeleton, less files to jump between. But that's
just personal preferences, so:

Acked-by: Andrii Nakryiko <andriin@...com>

>  .../selftests/bpf/prog_tests/bpf_iter.c       | 408 ++++++++++++++++++
>  .../selftests/bpf/progs/bpf_iter_test_kern1.c |   4 +
>  .../selftests/bpf/progs/bpf_iter_test_kern2.c |   4 +
>  .../selftests/bpf/progs/bpf_iter_test_kern3.c |  18 +
>  .../selftests/bpf/progs/bpf_iter_test_kern4.c |  52 +++
>  .../bpf/progs/bpf_iter_test_kern_common.h     |  22 +
>  6 files changed, 508 insertions(+)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/bpf_iter.c
>  create mode 100644 tools/testing/selftests/bpf/progs/bpf_iter_test_kern1.c
>  create mode 100644 tools/testing/selftests/bpf/progs/bpf_iter_test_kern2.c
>  create mode 100644 tools/testing/selftests/bpf/progs/bpf_iter_test_kern3.c
>  create mode 100644 tools/testing/selftests/bpf/progs/bpf_iter_test_kern4.c
>  create mode 100644 tools/testing/selftests/bpf/progs/bpf_iter_test_kern_common.h
>

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