From: Song Liu <songliubraving@fb.com>
To: "Toke Høiland-Jørgensen" <toke@redhat.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>,
Alexei Starovoitov <ast@kernel.org>, Martin Lau <kafai@fb.com>,
Yonghong Song <yhs@fb.com>,
Jesper Dangaard Brouer <brouer@redhat.com>,
Andrii Nakryiko <andrii.nakryiko@gmail.com>,
David Miller <davem@davemloft.net>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"bpf@vger.kernel.org" <bpf@vger.kernel.org>
Subject: Re: [PATCH bpf-next 3/6] libbpf: Propagate EPERM to caller on program load
Date: Fri, 8 Nov 2019 19:36:05 +0000 [thread overview]
Message-ID: <68FB5A08-C8DA-4D64-949C-C725483A9999@fb.com> (raw)
In-Reply-To: <157314554141.693412.14085088717794768890.stgit@toke.dk>
> On Nov 7, 2019, at 8:52 AM, Toke Høiland-Jørgensen <toke@redhat.com> wrote:
>
> From: Toke Høiland-Jørgensen <toke@redhat.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@redhat.com>
Acked-by: Song Liu <songliubraving@fb.com>
next prev parent reply other threads:[~2019-11-08 19:36 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-07 16:52 [PATCH bpf-next 0/6] libbpf: Fix pinning and error message bugs and add new getters Toke Høiland-Jørgensen
2019-11-07 16:52 ` [PATCH bpf-next 1/6] libbpf: Unpin auto-pinned maps if loading fails Toke Høiland-Jørgensen
2019-11-08 19:27 ` Song Liu
2019-11-07 16:52 ` [PATCH bpf-next 2/6] selftests/bpf: Add tests for automatic map unpinning on load failure Toke Høiland-Jørgensen
2019-11-08 19:33 ` Song Liu
2019-11-08 20:00 ` Toke Høiland-Jørgensen
2019-11-07 16:52 ` [PATCH bpf-next 3/6] libbpf: Propagate EPERM to caller on program load Toke Høiland-Jørgensen
2019-11-08 19:36 ` Song Liu [this message]
2019-11-07 16:52 ` [PATCH bpf-next 4/6] libbpf: Use pr_warn() when printing netlink errors Toke Høiland-Jørgensen
2019-11-08 19:37 ` Song Liu
2019-11-07 16:52 ` [PATCH bpf-next 5/6] libbpf: Add bpf_get_link_xdp_info() function to get more XDP information Toke Høiland-Jørgensen
2019-11-08 19:52 ` Song Liu
2019-11-08 20:04 ` Toke Høiland-Jørgensen
2019-11-07 16:52 ` [PATCH bpf-next 6/6] libbpf: Add getter for program size Toke Høiland-Jørgensen
2019-11-08 19:55 ` Song Liu
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