netdev - Re: [PATCH bpf-next 1/6] libbpf: Unpin auto-pinned maps if loading fails

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Message-ID: <CAPhsuW5yr1EX8r3iRT_Hb8+hnz1MJzW=rc__FoP1-A5+K4Pb2A@mail.gmail.com>
Date:   Fri, 8 Nov 2019 11:27:00 -0800
From:   Song Liu <liu.song.a23@...il.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        David Miller <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf-next 1/6] libbpf: Unpin auto-pinned maps if loading fails

On Thu, Nov 7, 2019 at 8:52 AM Toke Høiland-Jørgensen <toke@...hat.com> wrote:
>
> From: Toke Høiland-Jørgensen <toke@...hat.com>
>
> Since the automatic map-pinning happens during load, it will leave pinned
> maps around if the load fails at a later stage. Fix this by unpinning any
> pinned maps on cleanup. To avoid unpinning pinned maps that were reused
> rather than newly pinned, add a new boolean property on struct bpf_map to
> keep track of whether that map was reused or not; and only unpin those maps
> that were not reused.
>
> Fixes: 57a00f41644f ("libbpf: Add auto-pinning of maps when loading BPF objects")
> Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>

Acked-by: Song Liu <songliubraving@...com>