netdev - Re: [PATCH v3 bpf-next 5/7] libbpf: move bpf_{helpers,endian,tracing}.h into libbpf

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Date:   Fri, 4 Oct 2019 08:47:16 -0600
From:   David Ahern <dsahern@...il.com>
To:     Andrii Nakryiko <andriin@...com>, bpf@...r.kernel.org,
        netdev@...r.kernel.org, ast@...com, daniel@...earbox.net
Cc:     andrii.nakryiko@...il.com, kernel-team@...com
Subject: Re: [PATCH v3 bpf-next 5/7] libbpf: move
 bpf_{helpers,endian,tracing}.h into libbpf

On 10/3/19 3:28 PM, Andrii Nakryiko wrote:
> Move bpf_helpers.h, bpf_tracing.h, and bpf_endian.h into libbpf. Ensure
> they are installed along the other libbpf headers. Also, adjust
> selftests and samples include path to include libbpf now.

There are side effects to bringing bpf_helpers.h into libbpf if this
gets propagated to the github sync.

bpf_helpers.h references BPF_FUNC_* which are defined in the
uapi/linux/bpf.h header. That is a kernel version dependent api file
which means attempts to use newer libbpf with older kernel headers is
going to throw errors when compiling bpf programs -- bpf_helpers.h will
contain undefined BPF_FUNC references.