netdev - Re: [PATCH bpf] selftests: bpf: fix inlines in test_lwt

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Message-ID: <CAPhsuW4ncpfNCvbYHF36pb6ZEBJMX-iJP5sD0x3PbmAds+WGOQ@mail.gmail.com>
Date:   Sat, 29 Jun 2019 11:04:18 -0700
From:   Song Liu <liu.song.a23@...il.com>
To:     Jiri Benc <jbenc@...hat.com>
Cc:     Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Mathieu Xhonneux <m.xhonneux@...il.com>
Subject: Re: [PATCH bpf] selftests: bpf: fix inlines in test_lwt_seg6local

On Sat, Jun 29, 2019 at 7:43 AM Jiri Benc <jbenc@...hat.com> wrote:
>
> Selftests are reporting this failure in test_lwt_seg6local.sh:
>
> + ip netns exec ns2 ip -6 route add fb00::6 encap bpf in obj test_lwt_seg6local.o sec encap_srh dev veth2
> Error fetching program/map!
> Failed to parse eBPF program: Operation not permitted
>
> The problem is __attribute__((always_inline)) alone is not enough to prevent
> clang from inserting those functions in .text. In that case, .text is not
> marked as relocateable.
>
> See the output of objdump -h test_lwt_seg6local.o:
>
> Idx Name          Size      VMA               LMA               File off  Algn
>   0 .text         00003530  0000000000000000  0000000000000000  00000040  2**3
>                   CONTENTS, ALLOC, LOAD, READONLY, CODE
>
> This causes the iproute bpf loader to fail in bpf_fetch_prog_sec:
> bpf_has_call_data returns true but bpf_fetch_prog_relo fails as there's no
> relocateable .text section in the file.
>
> Add 'static inline' to fix this.
>
> Fixes: c99a84eac026 ("selftests/bpf: test for seg6local End.BPF action")
> Signed-off-by: Jiri Benc <jbenc@...hat.com>

Maybe use "__always_inline" as most other tests do?

Thanks,
Song