linux-kernel - Re: [PATCH v2 0/6] Add _opts variant for bpf_*_get_fd_by

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Date:   Fri, 7 Oct 2022 12:59:17 +0200
From:   Jiri Olsa <olsajiri@...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, 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: [PATCH v2 0/6] Add _opts variant for bpf_*_get_fd_by_id()

On Thu, Oct 06, 2022 at 01:07:30PM +0200, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu@...wei.com>
> 
> 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.
> 
> Pass the options through a newly introduced structure,
> bpf_get_fd_by_id_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.
> 
> Changelog
> 
> v1:
>  - Don't CC stable kernel mailing list for patch 1 (suggested by Andrii)
>  - Rename bpf_get_fd_opts struct to bpf_get_fd_by_id_opts (suggested by
>    Andrii)
>  - Move declaration of _opts variants after non-opts variants (suggested by
>    Andrii)
>  - Correctly initialize bpf_map_info, fix style issues, use map from
>    skeleton, check valid fd in the test (suggested by Andrii)
>  - Rename libbpf_get_fd_opts test to libbpf_get_fd_by_id_opts
> 
> Roberto Sassu (6):
>   libbpf: Fix LIBBPF_1.0.0 declaration in libbpf.map
>   libbpf: Introduce bpf_get_fd_by_id_opts and
>     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()

it's not marked, but I'm assuming this goes to bpf-next, right?

anyway, lgtm

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka

> 
>  tools/lib/bpf/bpf.c                           | 48 +++++++++-
>  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_by_id_opts.c | 87 +++++++++++++++++++
>  .../bpf/progs/test_libbpf_get_fd_by_id_opts.c | 36 ++++++++
>  6 files changed, 189 insertions(+), 5 deletions(-)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/libbpf_get_fd_by_id_opts.c
>  create mode 100644 tools/testing/selftests/bpf/progs/test_libbpf_get_fd_by_id_opts.c
> 
> -- 
> 2.25.1
>