netdev - Re: [PATCH bpf-next v3 3/6] libbpf: Propagate EPERM to caller on program load

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Message-ID: <CAEf4Bza7OxXsc3Wh0Skw6PnoPaOKggBqxFn12g+Gi8CUvQBVqg@mail.gmail.com>
Date:   Fri, 8 Nov 2019 16:44:24 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...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>,
        David Miller <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf-next v3 3/6] libbpf: Propagate EPERM to caller on
 program load

On Fri, Nov 8, 2019 at 4:01 PM Toke Høiland-Jørgensen <toke@...hat.com> wrote:
>
> From: Toke Høiland-Jørgensen <toke@...hat.com>
>
> When loading an eBPF program, libbpf overrides the return code for EPERM
> errors instead of returning it to the caller. This makes it hard to figure
> out what went wrong on load.
>
> In particular, EPERM is returned when the system rlimit is too low to lock
> the memory required for the BPF program. Previously, this was somewhat
> obscured because the rlimit error would be hit on map creation (which does
> return it correctly). However, since maps can now be reused, object load
> can proceed all the way to loading programs without hitting the error;
> propagating it even in this case makes it possible for the caller to react
> appropriately (and, e.g., attempt to raise the rlimit before retrying).
>
> Acked-by: David S. Miller <davem@...emloft.net>
> Acked-by: Song Liu <songliubraving@...com>
> Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
> ---

Acked-by: Andrii Nakryiko <andriin@...com>

>  tools/lib/bpf/libbpf.c |   27 +++++++++++----------------
>  1 file changed, 11 insertions(+), 16 deletions(-)
>

[...]