linux-kernel - Re: [RESEND][PATCH 0/6] Add _opts variant for bpf_*_get_fd_by

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Message-ID: <CAEf4BzYba-4gG8HRiAfrWTO9wo9tmB-5fB03zxOV=SCEqc800A@mail.gmail.com>
Date:   Wed, 5 Oct 2022 16:14:11 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Roberto Sassu <roberto.sassu@...weicloud.com>
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        martin.lau@...ux.dev, song@...nel.org, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, mykolal@...com,
        shuah@...nel.org, bpf@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [RESEND][PATCH 0/6] Add _opts variant for bpf_*_get_fd_by_id()

On Tue, Oct 4, 2022 at 6:18 AM Roberto Sassu
<roberto.sassu@...weicloud.com> wrote:
>
> From: Roberto Sassu <roberto.sassu@...wei.com>
>
> NOTE: resending with libbpf_get_fd_opts test added to deny list for s390x.

it's not a resend if you change something in patches, it's a new
version, please mark it appropriately with v2 instead of [RESEND]

>
> Add the _opts variant for bpf_*_get_fd_by_id() functions, to be able to
> pass to the kernel more options, when requesting a fd of an eBPF object to
> the kernel.
>
> Pass the options through a newly introduced structure, bpf_get_fd_opts,
> which currently contains open_flags (the other two members are for
> compatibility and for padding).
>
> open_flags allows the caller to request specific permissions to access a
> map (e.g. read-only). This is useful for example in the situation where a
> map is write-protected.
>
> Besides patches 2-6, which introduce the new variants and the data
> structure, patch 1 fixes the LIBBPF_1.0.0 declaration in libbpf.map.
>
> Roberto Sassu (6):
>   libbpf: Fix LIBBPF_1.0.0 declaration in libbpf.map
>   libbpf: Define bpf_get_fd_opts and introduce
>     bpf_map_get_fd_by_id_opts()
>   libbpf: Introduce bpf_prog_get_fd_by_id_opts()
>   libbpf: Introduce bpf_btf_get_fd_by_id_opts()
>   libbpf: Introduce bpf_link_get_fd_by_id_opts()
>   selftests/bpf: Add tests for _opts variants of bpf_*_get_fd_by_id()
>
>  tools/lib/bpf/bpf.c                           | 47 +++++++++-
>  tools/lib/bpf/bpf.h                           | 16 ++++
>  tools/lib/bpf/libbpf.map                      |  6 +-
>  tools/testing/selftests/bpf/DENYLIST.s390x    |  1 +
>  .../bpf/prog_tests/libbpf_get_fd_opts.c       | 88 +++++++++++++++++++
>  .../bpf/progs/test_libbpf_get_fd_opts.c       | 36 ++++++++
>  6 files changed, 189 insertions(+), 5 deletions(-)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/libbpf_get_fd_opts.c
>  create mode 100644 tools/testing/selftests/bpf/progs/test_libbpf_get_fd_opts.c
>
> --
> 2.25.1
>