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From: Jiri Olsa <jolsa@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andriin@fb.com>
Cc: netdev@vger.kernel.org, bpf@vger.kernel.org,
	Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
	Martin KaFai Lau <kafai@fb.com>, David Miller <davem@redhat.com>,
	John Fastabend <john.fastabend@gmail.com>,
	Wenbo Zhang <ethercflow@gmail.com>,
	KP Singh <kpsingh@chromium.org>,
	Brendan Gregg <bgregg@netflix.com>,
	Florent Revest <revest@chromium.org>,
	Al Viro <viro@zeniv.linux.org.uk>
Subject: [PATCH v8 bpf-next 00/13] bpf: Add d_path helper
Date: Wed, 22 Jul 2020 23:12:10 +0200
Message-ID: <20200722211223.1055107-1-jolsa@kernel.org> (raw)

hi,
adding d_path helper function that returns full path for
given 'struct path' object, which needs to be the kernel
BTF 'path' object. The path is returned in buffer provided
'buf' of size 'sz' and is zero terminated.

  int bpf_d_path(struct path *path, char *buf, u32 sz);

The helper calls directly d_path function, so there's only
limited set of function it can be called from.

The patchset also adds support to add set of BTF IDs for
a helper to define functions that the helper is allowed
to be called from.

Also available at:
  https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
  bpf/d_path

v8 changes:
  - rebased on Yonghong's latest changes
  - factored btf_struct_access function [Andrii]
  - fixed leftovers fro mthe preparation changes

thanks,
jirka


---
Jiri Olsa (13):
      selftests/bpf: Fix resolve_btfids test
      tools resolve_btfids: Add support for set symbols
      bpf: Move btf_resolve_size into __btf_resolve_size
      bpf: Add elem_id pointer as argument to __btf_resolve_size
      bpf: Add type_id pointer as argument to __btf_resolve_size
      bpf: Factor btf_struct_access function
      bpf: Add btf_struct_ids_match function
      bpf: Add BTF_SET_START/END macros
      bpf: Add d_path helper
      bpf: Update .BTF_ids section in btf.rst with sets info
      selftests/bpf: Add verifier test for d_path helper
      selftests/bpf: Add test for d_path helper
      selftests/bpf: Add set test to resolve_btfids

 Documentation/bpf/btf.rst                               |  25 +++++++++++++++
 include/linux/bpf.h                                     |   6 ++++
 include/linux/btf.h                                     |   3 +-
 include/linux/btf_ids.h                                 |  43 ++++++++++++++++++++++++-
 include/uapi/linux/bpf.h                                |  13 ++++++++
 kernel/bpf/bpf_struct_ops.c                             |   6 ++--
 kernel/bpf/btf.c                                        | 148 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------------
 kernel/bpf/verifier.c                                   |  23 ++++++++++----
 kernel/trace/bpf_trace.c                                |  48 ++++++++++++++++++++++++++++
 scripts/bpf_helpers_doc.py                              |   2 ++
 tools/bpf/resolve_btfids/main.c                         |  15 ++++++++-
 tools/include/linux/btf_ids.h                           |  43 ++++++++++++++++++++++++-
 tools/include/uapi/linux/bpf.h                          |  13 ++++++++
 tools/testing/selftests/bpf/prog_tests/d_path.c         | 162 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tools/testing/selftests/bpf/prog_tests/resolve_btfids.c |  34 ++++++++++++++++++++
 tools/testing/selftests/bpf/progs/test_d_path.c         |  64 ++++++++++++++++++++++++++++++++++++++
 tools/testing/selftests/bpf/test_verifier.c             |  19 +++++++++++-
 tools/testing/selftests/bpf/verifier/d_path.c           |  37 ++++++++++++++++++++++
 18 files changed, 667 insertions(+), 37 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/d_path.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_d_path.c
 create mode 100644 tools/testing/selftests/bpf/verifier/d_path.c


             reply index

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-22 21:12 Jiri Olsa [this message]
2020-07-22 21:12 ` [PATCH v8 bpf-next 01/13] selftests/bpf: Fix resolve_btfids test Jiri Olsa
2020-07-28 20:27   ` Andrii Nakryiko
2020-07-29 20:06     ` Jiri Olsa
2020-07-29 21:38       ` Andrii Nakryiko
2020-07-22 21:12 ` [PATCH v8 bpf-next 02/13] tools resolve_btfids: Add support for set symbols Jiri Olsa
2020-07-28  0:53   ` Andrii Nakryiko
2020-07-28  9:35     ` Jiri Olsa
2020-07-22 21:12 ` [PATCH v8 bpf-next 03/13] bpf: Move btf_resolve_size into __btf_resolve_size Jiri Olsa
2020-07-28 20:29   ` Andrii Nakryiko
2020-07-22 21:12 ` [PATCH v8 bpf-next 04/13] bpf: Add elem_id pointer as argument to __btf_resolve_size Jiri Olsa
2020-07-28 20:30   ` Andrii Nakryiko
2020-07-22 21:12 ` [PATCH v8 bpf-next 05/13] bpf: Add type_id " Jiri Olsa
2020-07-22 21:12 ` [PATCH v8 bpf-next 06/13] bpf: Factor btf_struct_access function Jiri Olsa
2020-07-28 23:27   ` Andrii Nakryiko
2020-07-29 15:59     ` Jiri Olsa
2020-07-22 21:12 ` [PATCH v8 bpf-next 07/13] bpf: Add btf_struct_ids_match function Jiri Olsa
2020-07-28 23:35   ` Andrii Nakryiko
2020-07-29 16:04     ` Jiri Olsa
2020-07-29 17:51       ` Andrii Nakryiko
2020-07-29 18:55         ` Jiri Olsa
2020-07-22 21:12 ` [PATCH v8 bpf-next 08/13] bpf: Add BTF_SET_START/END macros Jiri Olsa
2020-07-28 19:39   ` Andrii Nakryiko
2020-07-29 11:54     ` Jiri Olsa
2020-07-22 21:12 ` [PATCH v8 bpf-next 09/13] bpf: Add d_path helper Jiri Olsa
2020-07-28 19:47   ` Andrii Nakryiko
2020-07-29 15:54     ` Jiri Olsa
2020-07-29 20:11   ` Al Viro
2020-07-30 10:22     ` Jiri Olsa
2020-07-29 20:17   ` Al Viro
2020-07-30 10:09     ` Jiri Olsa
2020-07-22 21:12 ` [PATCH v8 bpf-next 10/13] bpf: Update .BTF_ids section in btf.rst with sets info Jiri Olsa
2020-07-22 21:12 ` [PATCH v8 bpf-next 11/13] selftests/bpf: Add verifier test for d_path helper Jiri Olsa
2020-07-28 19:49   ` Andrii Nakryiko
2020-07-22 21:12 ` [PATCH v8 bpf-next 12/13] selftests/bpf: Add " Jiri Olsa
2020-07-28 19:53   ` Andrii Nakryiko
2020-07-29 11:25     ` Jiri Olsa
2020-07-22 21:12 ` [PATCH v8 bpf-next 13/13] selftests/bpf: Add set test to resolve_btfids Jiri Olsa
2020-07-28 19:56   ` Andrii Nakryiko
2020-07-29 15:34     ` Jiri Olsa

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