netdev - Re: [PATCH bpf-next v2 11/15] selftests/xsk: get rid of built-in XDP program

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Message-ID: <CAEf4BzYawc4dgjMsUQYKPEECm=qtytktGzzSnrECz56FSVgcRg@mail.gmail.com>
Date:   Wed, 4 Jan 2023 15:15:17 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Magnus Karlsson <magnus.karlsson@...il.com>
Cc:     magnus.karlsson@...el.com, bjorn@...nel.org, ast@...nel.org,
        daniel@...earbox.net, netdev@...r.kernel.org,
        maciej.fijalkowski@...el.com, bpf@...r.kernel.org, yhs@...com,
        andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, tirthendu.sarkar@...el.com,
        jonathan.lemon@...il.com
Subject: Re: [PATCH bpf-next v2 11/15] selftests/xsk: get rid of built-in XDP program

On Wed, Jan 4, 2023 at 4:19 AM Magnus Karlsson
<magnus.karlsson@...il.com> wrote:
>
> From: Magnus Karlsson <magnus.karlsson@...el.com>
>
> Get rid of the built-in XDP program that was part of the old libbpf
> code in xsk.c and replace it with an eBPF program build using the
> framework by all the other bpf selftests. This will form the base for
> adding more programs in later commits.
>
> Signed-off-by: Magnus Karlsson <magnus.karlsson@...el.com>
> ---
>  tools/testing/selftests/bpf/Makefile          |  2 +-
>  .../selftests/bpf/progs/xsk_xdp_progs.c       | 19 ++++
>  tools/testing/selftests/bpf/xsk.c             | 88 ++++---------------
>  tools/testing/selftests/bpf/xsk.h             |  6 +-
>  tools/testing/selftests/bpf/xskxceiver.c      | 72 ++++++++-------
>  tools/testing/selftests/bpf/xskxceiver.h      |  7 +-
>  6 files changed, 88 insertions(+), 106 deletions(-)
>  create mode 100644 tools/testing/selftests/bpf/progs/xsk_xdp_progs.c
>
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index 205e8c3c346a..a0193a8f9da6 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -240,7 +240,7 @@ $(OUTPUT)/flow_dissector_load: $(TESTING_HELPERS)
>  $(OUTPUT)/test_maps: $(TESTING_HELPERS)
>  $(OUTPUT)/test_verifier: $(TESTING_HELPERS) $(CAP_HELPERS)
>  $(OUTPUT)/xsk.o: $(BPFOBJ)

shouldn't $(OUTPUT)/xsk_xdp_progs.skel.h be added as a dependency
here, at .o file?

> -$(OUTPUT)/xskxceiver: $(OUTPUT)/xsk.o
> +$(OUTPUT)/xskxceiver: $(OUTPUT)/xsk.o $(OUTPUT)/xsk_xdp_progs.skel.h

and not here. Is that why we have this clang compilation failure?

>
>  BPFTOOL ?= $(DEFAULT_BPFTOOL)
>  $(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile)    \

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