From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: "Toke Høiland-Jørgensen" <toke@redhat.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>,
Alexei Starovoitov <ast@kernel.org>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
Jesper Dangaard Brouer <brouer@redhat.com>,
David Miller <davem@davemloft.net>,
Networking <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>
Subject: Re: [PATCH bpf-next v3 3/6] libbpf: Propagate EPERM to caller on program load
Date: Fri, 8 Nov 2019 16:44:24 -0800 [thread overview]
Message-ID: <CAEf4Bza7OxXsc3Wh0Skw6PnoPaOKggBqxFn12g+Gi8CUvQBVqg@mail.gmail.com> (raw)
In-Reply-To: <157325765795.27401.949901357190446266.stgit@toke.dk>
On Fri, Nov 8, 2019 at 4:01 PM 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, 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@davemloft.net>
> Acked-by: Song Liu <songliubraving@fb.com>
> Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
> ---
Acked-by: Andrii Nakryiko <andriin@fb.com>
> tools/lib/bpf/libbpf.c | 27 +++++++++++----------------
> 1 file changed, 11 insertions(+), 16 deletions(-)
>
[...]
next prev parent reply other threads:[~2019-11-09 0:44 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-09 0:00 [PATCH bpf-next v3 0/6] libbpf: Fix pinning and error message bugs and add new getters Toke Høiland-Jørgensen
2019-11-09 0:00 ` [PATCH bpf-next v3 1/6] libbpf: Unpin auto-pinned maps if loading fails Toke Høiland-Jørgensen
2019-11-09 0:42 ` Andrii Nakryiko
2019-11-09 0:00 ` [PATCH bpf-next v3 2/6] selftests/bpf: Add tests for automatic map unpinning on load failure Toke Høiland-Jørgensen
2019-11-09 0:00 ` [PATCH bpf-next v3 3/6] libbpf: Propagate EPERM to caller on program load Toke Høiland-Jørgensen
2019-11-09 0:44 ` Andrii Nakryiko [this message]
2019-11-09 0:00 ` [PATCH bpf-next v3 4/6] libbpf: Use pr_warn() when printing netlink errors Toke Høiland-Jørgensen
2019-11-09 0:01 ` [PATCH bpf-next v3 5/6] libbpf: Add bpf_get_link_xdp_info() function to get more XDP information Toke Høiland-Jørgensen
2019-11-09 0:51 ` Andrii Nakryiko
2019-11-09 11:20 ` Toke Høiland-Jørgensen
2019-11-09 19:10 ` Andrii Nakryiko
2019-11-09 20:18 ` Toke Høiland-Jørgensen
2019-11-09 0:01 ` [PATCH bpf-next v3 6/6] libbpf: Add getter for program size Toke Høiland-Jørgensen
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