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

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Message-ID: <68FB5A08-C8DA-4D64-949C-C725483A9999@fb.com>
Date:   Fri, 8 Nov 2019 19:36:05 +0000
From:   Song Liu <songliubraving@...com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
CC:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>, Martin Lau <kafai@...com>,
        Yonghong Song <yhs@...com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        David Miller <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf-next 3/6] libbpf: Propagate EPERM to caller on program
 load



> On Nov 7, 2019, at 8:52 AM, 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, sine maps can now be reused, object load can
				^^ since
> 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).
> 
> Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>

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