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Message-ID: <20201201003137.1692914-1-andrii@kernel.org>
Date: Mon, 30 Nov 2020 16:31:30 -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 v2 bpf-next 0/7] libbpf: add support for kernel module BTF CO-RE relocations
Implement libbpf support for performing CO-RE relocations against types in
kernel module BTFs, in addition to existing vmlinux BTF support.
This is a first step towards fully supporting kernel module BTFs. Subsequent
patch sets will expand kernel and libbpf sides to allow using other
BTF-powered capabilities (fentry/fexit, struct_ops, ksym externs, etc). For
CO-RE relocations support, though, no extra kernel changes are necessary.
This patch set also sets up a convenient and fully-controlled custom kernel
module (called "bpf_testmod"), that is a predictable playground for all the
BPF selftests, that rely on module BTFs.
v1->v2:
- module_put() inside preempt_disable() region (Alexei);
- bpf_sidecar -> bpf_testmod rename (Alexei);
- test_progs more relaxed handling of bpf_testmod;
- test_progs marks skipped sub-tests properly as SKIP now.
Andrii Nakryiko (7):
bpf: fix bpf_put_raw_tracepoint()'s use of __module_address()
libbpf: add internal helper to load BTF data by FD
libbpf: refactor CO-RE relocs to not assume a single BTF object
libbpf: add kernel module BTF support for CO-RE relocations
selftests/bpf: add bpf_testmod kernel module for testing
selftests/bpf: add support for marking sub-tests as skipped
selftests/bpf: add CO-RE relocs selftest relying on kernel module BTF
kernel/trace/bpf_trace.c | 8 +-
tools/lib/bpf/btf.c | 61 ++--
tools/lib/bpf/libbpf.c | 345 ++++++++++++++----
tools/lib/bpf/libbpf_internal.h | 1 +
tools/testing/selftests/bpf/.gitignore | 1 +
tools/testing/selftests/bpf/Makefile | 12 +-
.../selftests/bpf/bpf_testmod/.gitignore | 6 +
.../selftests/bpf/bpf_testmod/Makefile | 20 +
.../bpf/bpf_testmod/bpf_testmod-events.h | 36 ++
.../selftests/bpf/bpf_testmod/bpf_testmod.c | 51 +++
.../selftests/bpf/bpf_testmod/bpf_testmod.h | 14 +
.../selftests/bpf/prog_tests/core_reloc.c | 79 +++-
.../selftests/bpf/progs/core_reloc_types.h | 17 +
.../bpf/progs/test_core_reloc_module.c | 66 ++++
tools/testing/selftests/bpf/test_progs.c | 65 +++-
tools/testing/selftests/bpf/test_progs.h | 1 +
16 files changed, 661 insertions(+), 122 deletions(-)
create mode 100644 tools/testing/selftests/bpf/bpf_testmod/.gitignore
create mode 100644 tools/testing/selftests/bpf/bpf_testmod/Makefile
create mode 100644 tools/testing/selftests/bpf/bpf_testmod/bpf_testmod-events.h
create mode 100644 tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
create mode 100644 tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.h
create mode 100644 tools/testing/selftests/bpf/progs/test_core_reloc_module.c
--
2.24.1
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