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 v9 bpf-next 11/14] bpf: Update .BTF_ids section in btf.rst with sets info
Date: Sat, 1 Aug 2020 19:03:19 +0200 [thread overview]
Message-ID: <20200801170322.75218-12-jolsa@kernel.org> (raw)
In-Reply-To: <20200801170322.75218-1-jolsa@kernel.org>
Updating btf.rst doc with info about BTF_SET_START/END macros.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
Documentation/bpf/btf.rst | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/Documentation/bpf/btf.rst b/Documentation/bpf/btf.rst
index b5361b8621c9..44dc789de2b4 100644
--- a/Documentation/bpf/btf.rst
+++ b/Documentation/bpf/btf.rst
@@ -724,6 +724,31 @@ want to define unused entry in BTF_ID_LIST, like::
BTF_ID_UNUSED
BTF_ID(struct, task_struct)
+The ``BTF_SET_START/END`` macros pair defines sorted list of BTF ID values
+and their count, with following syntax::
+
+ BTF_SET_START(set)
+ BTF_ID(type1, name1)
+ BTF_ID(type2, name2)
+ BTF_SET_END(set)
+
+resulting in following layout in .BTF_ids section::
+
+ __BTF_ID__set__set:
+ .zero 4
+ __BTF_ID__type1__name1__3:
+ .zero 4
+ __BTF_ID__type2__name2__4:
+ .zero 4
+
+The ``struct btf_id_set set;`` variable is defined to access the list.
+
+The ``typeX`` name can be one of following::
+
+ struct, union, typedef, func
+
+and is used as a filter when resolving the BTF ID value.
+
All the BTF ID lists and sets are compiled in the .BTF_ids section and
resolved during the linking phase of kernel build by ``resolve_btfids`` tool.
--
2.25.4
next prev parent reply other threads:[~2020-08-01 17:04 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-01 17:03 [PATCH v9 bpf-next 00/14] bpf: Add d_path helper Jiri Olsa
2020-08-01 17:03 ` [PATCH v9 bpf-next 01/14] tools resolve_btfids: Add size check to get_id function Jiri Olsa
2020-08-05 6:00 ` Andrii Nakryiko
2020-08-01 17:03 ` [PATCH v9 bpf-next 02/14] tools resolve_btfids: Add support for set symbols Jiri Olsa
2020-08-05 6:04 ` Andrii Nakryiko
2020-08-01 17:03 ` [PATCH v9 bpf-next 03/14] bpf: Move btf_resolve_size into __btf_resolve_size Jiri Olsa
2020-08-01 17:03 ` [PATCH v9 bpf-next 04/14] bpf: Add elem_id pointer as argument to __btf_resolve_size Jiri Olsa
2020-08-01 17:03 ` [PATCH v9 bpf-next 05/14] bpf: Add type_id " Jiri Olsa
2020-08-05 6:05 ` Andrii Nakryiko
2020-08-01 17:03 ` [PATCH v9 bpf-next 06/14] bpf: Remove recursion call in btf_struct_access Jiri Olsa
2020-08-05 6:12 ` Andrii Nakryiko
2020-08-05 17:36 ` Jiri Olsa
2020-08-01 17:03 ` [PATCH v9 bpf-next 07/14] bpf: Factor btf_struct_access function Jiri Olsa
2020-08-05 6:18 ` Andrii Nakryiko
2020-08-01 17:03 ` [PATCH v9 bpf-next 08/14] bpf: Add btf_struct_ids_match function Jiri Olsa
2020-08-05 6:27 ` Andrii Nakryiko
2020-08-05 17:56 ` Jiri Olsa
2020-08-05 21:31 ` Jiri Olsa
2020-08-05 21:57 ` Andrii Nakryiko
2020-08-01 17:03 ` [PATCH v9 bpf-next 09/14] bpf: Add BTF_SET_START/END macros Jiri Olsa
2020-08-05 6:29 ` Andrii Nakryiko
2020-08-01 17:03 ` [PATCH v9 bpf-next 10/14] bpf: Add d_path helper Jiri Olsa
2020-08-02 3:13 ` Alexei Starovoitov
2020-08-02 18:26 ` Jiri Olsa
2020-08-05 6:35 ` Andrii Nakryiko
2020-08-05 17:58 ` Jiri Olsa
2020-08-05 21:01 ` Jiri Olsa
2020-08-05 21:09 ` Andrii Nakryiko
2020-08-07 0:31 ` KP Singh
2020-08-07 8:35 ` Jiri Olsa
2020-08-07 9:42 ` KP Singh
2020-08-01 17:03 ` Jiri Olsa [this message]
2020-08-01 17:03 ` [PATCH v9 bpf-next 12/14] selftests/bpf: Add verifier test for " Jiri Olsa
2020-08-01 17:03 ` [PATCH v9 bpf-next 13/14] selftests/bpf: Add " Jiri Olsa
2020-08-05 6:40 ` Andrii Nakryiko
2020-08-05 18:00 ` Jiri Olsa
2020-08-01 17:03 ` [PATCH v9 bpf-next 14/14] selftests/bpf: Add set test to resolve_btfids Jiri Olsa
2020-08-05 6:41 ` Andrii Nakryiko
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