netdev - Re: [PATCH v2 bpf-next 4/7] selftests/bpf: split off tracing-only helpers into bpf

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Date:   Thu, 3 Oct 2019 09:22:36 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     Andrii Nakryiko <andriin@...com>, bpf <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH v2 bpf-next 4/7] selftests/bpf: split off tracing-only
 helpers into bpf_tracing.h

On Thu, Oct 3, 2019 at 12:35 AM Toke Høiland-Jørgensen <toke@...hat.com> wrote:
>
> Andrii Nakryiko <andriin@...com> writes:
>
> > +/* a helper structure used by eBPF C program
> > + * to describe BPF map attributes to libbpf loader
> > + */
> > +struct bpf_map_def {
> > +     unsigned int type;
> > +     unsigned int key_size;
> > +     unsigned int value_size;
> > +     unsigned int max_entries;
> > +     unsigned int map_flags;
> > +};
>
> Why is this still here? There's already an identical definition in libbpf.h...
>

It's a BPF (kernel) side vs userspace side difference. bpf_helpers.h
are included from BPF program, while libbpf.h won't work on kernel
side. So we have to have a duplicate of bpf_map_def.

> -Toke
>