linux-kernel - Re: [PATCH v3 bpf-next 08/11] libbpf: add libbpf support to batch ops

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Message-ID: <CAEf4BzaeLV8EkGunioqD=sn0Bin4EL0WMzp1T6GjdBajWaFQ+w@mail.gmail.com>
Date:   Wed, 18 Dec 2019 16:54:28 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Brian Vazquez <brianvv@...gle.com>
Cc:     Brian Vazquez <brianvv.kernel@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S . Miller" <davem@...emloft.net>,
        Yonghong Song <yhs@...com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Petar Penkov <ppenkov@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>,
        open list <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH v3 bpf-next 08/11] libbpf: add libbpf support to batch ops

On Wed, Dec 11, 2019 at 2:35 PM Brian Vazquez <brianvv@...gle.com> wrote:
>
> From: Yonghong Song <yhs@...com>
>
> Added four libbpf API functions to support map batch operations:
>   . int bpf_map_delete_batch( ... )
>   . int bpf_map_lookup_batch( ... )
>   . int bpf_map_lookup_and_delete_batch( ... )
>   . int bpf_map_update_batch( ... )
>
> Signed-off-by: Yonghong Song <yhs@...com>
> ---

These libbpf APIs should use _opts approach from the get go to make
them extensible, but preserving backwards/forward compatibility.
Please take a look at one of few that are already using them (or
follow Andrey's bpf_prog_attach work, as he's adding opts-based one at
the moment).

>  tools/lib/bpf/bpf.c      | 61 ++++++++++++++++++++++++++++++++++++++++
>  tools/lib/bpf/bpf.h      | 14 +++++++++
>  tools/lib/bpf/libbpf.map |  4 +++
>  3 files changed, 79 insertions(+)
>

[...]