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

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Date:   Wed, 4 Jan 2023 10:19:37 -0800
From:   Stanislav Fomichev <sdf@...gle.com>
To:     David Vernet <void@...ifault.com>
Cc:     Magnus Karlsson <magnus.karlsson@...il.com>,
        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, 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 10:14 AM David Vernet <void@...ifault.com> wrote:
>
> On Wed, Jan 04, 2023 at 01:17:40PM +0100, Magnus Karlsson 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: $(BPFOBJ)
> > -$(OUTPUT)/xskxceiver: $(OUTPUT)/xsk.o
> > +$(OUTPUT)/xskxceiver: $(OUTPUT)/xsk.o $(OUTPUT)/xsk_xdp_progs.skel.h
>
> Hi Magnus,
>
> This seems to break the selftests build for clang:
>
> $ pwd
> <redacted>/bpf-next/tools/testing/selftests/bpf
>
> $ make LLVM=1 CC=clang
>   MKDIR    libbpf
>   HOSTCC  /home/void/upstream/bpf-next/tools/testing/selftests/bpf/tools/build/libbpf/fixdep.o
>   HOSTLD  /home/void/upstream/bpf-next/tools/testing/selftests/bpf/tools/build/libbpf/fixdep-in.o
>   LINK    /home/void/upstream/bpf-next/tools/testing/selftests/bpf/tools/build/libbpf/fixdep
>
> ...
>
>   GEN-SKEL [test_progs-no_alu32] test_static_linked.skel.h
>   LINK-BPF [test_progs-no_alu32] test_usdt.bpf.o
>   GEN-SKEL [test_progs-no_alu32] linked_vars.skel.h
>   GEN-SKEL [test_progs-no_alu32] linked_funcs.skel.h
>   EXT-COPY [test_progs-no_alu32] urandom_read bpf_testmod.ko liburandom_read.so xdp_synproxy sign-file ima_setup.sh verify_sig_setup.sh btf_dump_test_case_bitfields.c btf_dump_test_case_multidim.c btf_dump_test_case_namespacing.c btf_dump_test_case_ordering.c btf_dump_test_case_packing.c btf_dump_test_case_padding.c btf_dump_test_case_syntax.c
>   GEN-SKEL [test_progs-no_alu32] linked_maps.skel.h
>   GEN-SKEL [test_progs-no_alu32] test_subskeleton.skel.h
>   BINARY   xskxceiver
>   BINARY   bench
>   GEN-SKEL [test_progs-no_alu32] test_subskeleton_lib.skel.h
>   GEN-SKEL [test_progs-no_alu32] test_usdt.skel.h
> clang-15: error: cannot specify -o when generating multiple output files
> make: *** [Makefile:171: /home/void/upstream/bpf-next/tools/testing/selftests/bpf/xskxceiver] Error 1
> make: *** Waiting for unfinished jobs....
> make[1]: Nothing to be done for 'docs'.
> $
>
> It's also broken on CI: https://github.com/kernel-patches/bpf/actions/runs/3837984934/jobs/6533917001
>
> Could you please look into this?

Ugh, that's the same issue I'm getting for my xdp_hw_metadata binary.
And I'm still at loss on how to reproduce it locally. (I've tried 'apt
install clang-16 in ubuntu latest docker container' and it's still
fine).
Any pointers on how to debug those github actions locally?

> Thanks,
> David