From: Ilya Leoshkevich <iii@linux.ibm.com>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>, Yonghong Song <yhs@fb.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
John Fastabend <john.fastabend@gmail.com>
Cc: bpf@vger.kernel.org, Heiko Carstens <heiko.carstens@de.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Ilya Leoshkevich <iii@linux.ibm.com>
Subject: [PATCH v3 bpf-next 6/6] bpf: Document BTF_KIND_FLOAT in btf.rst
Date: Sat, 20 Feb 2021 04:49:59 +0100 [thread overview]
Message-ID: <20210220034959.27006-7-iii@linux.ibm.com> (raw)
In-Reply-To: <20210220034959.27006-1-iii@linux.ibm.com>
Also document the expansion of the kind bitfield.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
Documentation/bpf/btf.rst | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/Documentation/bpf/btf.rst b/Documentation/bpf/btf.rst
index 44dc789de2b4..846354cd2d69 100644
--- a/Documentation/bpf/btf.rst
+++ b/Documentation/bpf/btf.rst
@@ -84,6 +84,7 @@ sequentially and type id is assigned to each recognized type starting from id
#define BTF_KIND_FUNC_PROTO 13 /* Function Proto */
#define BTF_KIND_VAR 14 /* Variable */
#define BTF_KIND_DATASEC 15 /* Section */
+ #define BTF_KIND_FLOAT 16 /* Floating point */
Note that the type section encodes debug info, not just pure types.
``BTF_KIND_FUNC`` is not a type, and it represents a defined subprogram.
@@ -95,8 +96,8 @@ Each type contains the following common data::
/* "info" bits arrangement
* bits 0-15: vlen (e.g. # of struct's members)
* bits 16-23: unused
- * bits 24-27: kind (e.g. int, ptr, array...etc)
- * bits 28-30: unused
+ * bits 24-28: kind (e.g. int, ptr, array...etc)
+ * bits 29-30: unused
* bit 31: kind_flag, currently used by
* struct, union and fwd
*/
@@ -452,6 +453,18 @@ map definition.
* ``offset``: the in-section offset of the variable
* ``size``: the size of the variable in bytes
+2.2.16 BTF_KIND_FLOAT
+~~~~~~~~~~~~~~~~~~~~~
+
+``struct btf_type`` encoding requirement:
+ * ``name_off``: any valid offset
+ * ``info.kind_flag``: 0
+ * ``info.kind``: BTF_KIND_FLOAT
+ * ``info.vlen``: 0
+ * ``size``: the size of the float type in bytes: 2, 4, 8, 12 or 16.
+
+No additional type data follow ``btf_type``.
+
3. BTF Kernel API
*****************
--
2.29.2
next prev parent reply other threads:[~2021-02-20 3:52 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-20 3:49 [PATCH v3 bpf-next 0/6] Add BTF_KIND_FLOAT support Ilya Leoshkevich
2021-02-20 3:49 ` [PATCH v3 bpf-next 1/6] bpf: Add BTF_KIND_FLOAT to uapi Ilya Leoshkevich
2021-02-22 3:42 ` Yonghong Song
2021-02-20 3:49 ` [PATCH v3 bpf-next 2/6] libbpf: Add BTF_KIND_FLOAT support Ilya Leoshkevich
2021-02-22 3:41 ` Yonghong Song
2021-02-20 3:49 ` [PATCH v3 bpf-next 3/6] tools/bpftool: " Ilya Leoshkevich
2021-02-22 3:44 ` Yonghong Song
2021-02-20 3:49 ` [PATCH v3 bpf-next 4/6] bpf: " Ilya Leoshkevich
2021-02-20 6:13 ` kernel test robot
2021-02-20 6:13 ` kernel test robot
2021-02-20 6:24 ` kernel test robot
2021-02-20 6:24 ` kernel test robot
2021-02-21 16:37 ` Ilya Leoshkevich
2021-02-20 3:49 ` [PATCH v3 bpf-next 5/6] selftest/bpf: Add BTF_KIND_FLOAT tests Ilya Leoshkevich
2021-02-22 3:53 ` Yonghong Song
2021-02-20 3:49 ` Ilya Leoshkevich [this message]
2021-02-22 3:55 ` [PATCH v3 bpf-next 6/6] bpf: Document BTF_KIND_FLOAT in btf.rst Yonghong Song
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