...and provide an example of output. Signed-off-by: Alan Maguire --- .../bpf/bpftool/Documentation/bpftool-btf.rst | 28 +++++++++++++++++-- 1 file changed, 26 insertions(+), 2 deletions(-) diff --git a/tools/bpf/bpftool/Documentation/bpftool-btf.rst b/tools/bpf/bpftool/Documentation/bpftool-btf.rst index d47dddc2b4ee..1c11b5647ab7 100644 --- a/tools/bpf/bpftool/Documentation/bpftool-btf.rst +++ b/tools/bpf/bpftool/Documentation/bpftool-btf.rst @@ -28,7 +28,7 @@ BTF COMMANDS | **bpftool** **btf help** | | *BTF_SRC* := { **id** *BTF_ID* | **prog** *PROG* | **map** *MAP* [{**key** | **value** | **kv** | **all**}] | **file** *FILE* } -| *FORMAT* := { **raw** | **c** [**unsorted**] } +| *FORMAT* := { **raw** | **c** [**unsorted**] | **meta** } | *MAP* := { **id** *MAP_ID* | **pinned** *FILE* } | *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* | **name** *PROG_NAME* } @@ -65,7 +65,8 @@ bpftool btf dump *BTF_SRC* [format *FORMAT*] [root_id *ROOT_ID*] **format** option can be used to override default (raw) output format. Raw (**raw**) or C-syntax (**c**) output formats are supported. With C-style formatting, the output is sorted by default. Use the **unsorted** option - to avoid sorting the output. + to avoid sorting the output. BTF metadata can be displayed with the + **meta** option. **root_id** option can be used to filter a dump to a single type and all its dependent types. It cannot be used with any other types of filtering @@ -267,3 +268,26 @@ All the standard ways to specify map or program are supported: [104859] FUNC 'smbalert_work' type_id=9695 linkage=static [104860] FUNC 'smbus_alert' type_id=71367 linkage=static [104861] FUNC 'smbus_do_alert' type_id=84827 linkage=static + +Display BTF metadata from file vmlinux + +**# bpftool btf dump file vmlinux format meta** + +:: + + size 5161076 + magic 0xeb9f + version 1 + flags 0x1 + hdr_len 40 + type_len 3036368 + type_off 0 + str_len 2124588 + str_off 3036368 + kind_layout_len 80 + kind_layout_off 5160956 + kind 0 UNKNOWN info_sz 0 elem_sz 0 + kind 1 INT info_sz 0 elem_sz 0 + kind 2 PTR info_sz 0 elem_sz 0 + kind 3 ARRAY info_sz 0 elem_sz 0 + kind 4 STRUCT info_sz 0 elem_sz 0 -- 2.39.3