netdev - [PATCH bpf-next 0/3] Add user-space and non-CO-RE variants of BPF_CORE

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Date:   Fri, 18 Dec 2020 15:56:11 -0800
From:   Andrii Nakryiko <andrii@...nel.org>
To:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>, <ast@...com>,
        <daniel@...earbox.net>
CC:     <andrii@...nel.org>, <kernel-team@...com>
Subject: [PATCH bpf-next 0/3] Add user-space and non-CO-RE variants of BPF_CORE_READ()

Add two sets of BPF_CORE_READ()-like macros. One is for reading kernel data
from user address space (e.g., UAPI data structs for syscalls). Another one is
non-CO-RE variants, which don't emit CO-RE relocations and thus won't fail on
kernels without BTF. The latter one still provides much shorter way to write
reads that needs to chase few pointers.

Andrii Nakryiko (3):
  libbpf: add user-space variants of BPF_CORE_READ() family of macros
  libbpf: add non-CO-RE variants of BPF_CORE_READ() macro family
  selftests/bpf: add tests for user- and non-CO-RE BPF_CORE_READ()
    variants

 tools/lib/bpf/bpf_core_read.h                 | 136 +++++++++++++-----
 .../bpf/prog_tests/core_read_macros.c         |  64 +++++++++
 .../bpf/progs/test_core_read_macros.c         |  51 +++++++
 3 files changed, 212 insertions(+), 39 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/core_read_macros.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_core_read_macros.c

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2.24.1