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From: Andrii Nakryiko <andrii@kernel.org>
To: <bpf@vger.kernel.org>, <netdev@vger.kernel.org>, <ast@fb.com>,
	<daniel@iogearbox.net>
Cc: <andrii@kernel.org>, <kernel-team@fb.com>
Subject: [PATCH v2 bpf-next 0/7] libbpf: add support for kernel module BTF CO-RE relocations
Date: Mon, 30 Nov 2020 16:31:30 -0800	[thread overview]
Message-ID: <20201201003137.1692914-1-andrii@kernel.org> (raw)

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


             reply	other threads:[~2020-12-01  0:32 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-01  0:31 Andrii Nakryiko [this message]
2020-12-01  0:31 ` [PATCH v2 bpf-next 1/7] bpf: fix bpf_put_raw_tracepoint()'s use of __module_address() Andrii Nakryiko
2020-12-01  0:31 ` [PATCH v2 bpf-next 2/7] libbpf: add internal helper to load BTF data by FD Andrii Nakryiko
2020-12-01  0:31 ` [PATCH v2 bpf-next 3/7] libbpf: refactor CO-RE relocs to not assume a single BTF object Andrii Nakryiko
2020-12-01  0:31 ` [PATCH v2 bpf-next 4/7] libbpf: add kernel module BTF support for CO-RE relocations Andrii Nakryiko
2020-12-01  0:31 ` [PATCH v2 bpf-next 5/7] selftests/bpf: add bpf_testmod kernel module for testing Andrii Nakryiko
2020-12-01  0:31 ` [PATCH v2 bpf-next 6/7] selftests/bpf: add support for marking sub-tests as skipped Andrii Nakryiko
2020-12-01  0:31 ` [PATCH v2 bpf-next 7/7] selftests/bpf: add CO-RE relocs selftest relying on kernel module BTF Andrii Nakryiko

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