linux-kernel - [PATCH v2 bpf-next 0/4] allow bpf_map_sum_elem

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Message-Id: <20230719092952.41202-1-aspsk@isovalent.com>
Date:   Wed, 19 Jul 2023 09:29:48 +0000
From:   Anton Protopopov <aspsk@...valent.com>
To:     Martin KaFai Lau <martin.lau@...ux.dev>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>,
        Hou Tao <houtao1@...wei.com>, Joe Stringer <joe@...valent.com>,
        Anton Protopopov <aspsk@...valent.com>, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: [PATCH v2 bpf-next 0/4] allow bpf_map_sum_elem_count for all program types

This series is a follow up to the recent change [1] which added
per-cpu insert/delete statistics for maps. The bpf_map_sum_elem_count
kfunc presented in the original series was only available to tracing
programs, so let's make it available to all.

The first patch makes types listed in the reg2btf_ids[] array to be
considered trusted by kfuncs.

The second patch allows to treat CONST_PTR_TO_MAP as trusted pointers from
kfunc's point of view by adding it to the reg2btf_ids[] array.

The third patch adds missing const to the map argument of the
bpf_map_sum_elem_count kfunc.

The fourth patch registers the bpf_map_sum_elem_count for all programs,
and patches selftests correspondingly.

  [1] https://lore.kernel.org/bpf/20230705160139.19967-1-aspsk@isovalent.com/

v1 -> v2:
  * treat the whole reg2btf_ids array as trusted (Alexei)

Anton Protopopov (4):
  bpf: consider types listed in reg2btf_ids as trusted
  bpf: consider CONST_PTR_TO_MAP as trusted pointer to struct bpf_map
  bpf: make an argument const in the bpf_map_sum_elem_count kfunc
  bpf: allow any program to use the bpf_map_sum_elem_count kfunc

 include/linux/btf_ids.h                       |  1 +
 kernel/bpf/map_iter.c                         |  7 +++---
 kernel/bpf/verifier.c                         | 22 +++++++++++--------
 .../selftests/bpf/progs/map_ptr_kern.c        |  5 +++++
 4 files changed, 22 insertions(+), 13 deletions(-)

-- 
2.34.1