netdev - Re: [PATCH] libbpf: Make bpf/bpf

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Message-ID: <CAEf4BzZaMX=xPSkOdggX6kMa_a2eWZws9W0EiJm7Qf1x1sR+cQ@mail.gmail.com>
Date:   Mon, 6 Apr 2020 23:52:38 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Yoshiki Komachi <komachi.yoshiki@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH] libbpf: Make bpf/bpf_helpers.h self-contained

On Mon, Apr 6, 2020 at 11:29 PM Yoshiki Komachi
<komachi.yoshiki@...il.com> wrote:
>
> I tried to compile a bpf program including bpf_helpers.h, however it
> resulted in failure as below:
>
>   # clang -I./linux/tools/lib/ -I/lib/modules/$(uname -r)/build/include/ \
>     -O2 -Wall -target bpf -emit-llvm -c bpf_prog.c -o bpf_prog.bc
>   ...
>   In file included from linux/tools/lib/bpf/bpf_helpers.h:5:
>   linux/tools/lib/bpf/bpf_helper_defs.h:56:82: error: unknown type name '__u64'
>   ...
>
> This is because bpf_helpers.h depends on linux/types.h and it is not
> self-contained. This has been like this long time, but since bpf_helpers.h
> was moved from selftests private file to libbpf header file, IMO it
> should include linux/types.h by itself.
>
> Fixes: e01a75c15969 ("libbpf: Move bpf_{helpers, helper_defs, endian, tracing}.h into libbpf")
> Signed-off-by: Yoshiki Komachi <komachi.yoshiki@...il.com>
> ---
>  tools/lib/bpf/bpf_helpers.h | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h
> index f69cc208778a..d9288e695eb1 100644
> --- a/tools/lib/bpf/bpf_helpers.h
> +++ b/tools/lib/bpf/bpf_helpers.h
> @@ -2,6 +2,7 @@
>  #ifndef __BPF_HELPERS__
>  #define __BPF_HELPERS__
>
> +#include <linux/types.h>
>  #include "bpf_helper_defs.h"

It's actually intentional, so that bpf_helpers.h can be used together
with auto-generated (from BTF) vmlinux.h (which will have all the
__u64 and other typedefs).

>
>  #define __uint(name, val) int (*name)[val]
> --
> 2.24.1
>