[PATCH v2 bpf-next 8/9] bpftool: update doc to describe bpftool btf dump .. format meta

[Alan Maguire <alan.maguire@xxxxxxxxxx>]

...and provide an example of output.

Signed-off-by: Alan Maguire <alan.maguire@xxxxxxxxxx>
---
 tools/bpf/bpftool/Documentation/bpftool-btf.rst | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/tools/bpf/bpftool/Documentation/bpftool-btf.rst b/tools/bpf/bpftool/Documentation/bpftool-btf.rst
index 342716f74ec4..6dd779dddbde 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** }
+|	*FORMAT* := { **raw** | **c** | **meta** }
 |	*MAP* := { **id** *MAP_ID* | **pinned** *FILE* }
 |	*PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* }
 
@@ -67,8 +67,8 @@ DESCRIPTION
 		  typically produced by clang or pahole.
 
 		  **format** option can be used to override default (raw)
-		  output format. Raw (**raw**) or C-syntax (**c**) output
-		  formats are supported.
+		  output format. Raw (**raw**), C-syntax (**c**) and
+                  BTF metadata (**meta**) formats are supported.
 
 	**bpftool btf help**
 		  Print short help message.
@@ -266,3 +266,13 @@ 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
+
+
+ **# bpftool btf dump file vmlinux format meta**
+
+ ::
+ size 4904369
+ magic 0xeb9f       version 1          flags 0x0          hdr_len 24
+ type      len 2893508    off 0
+ str       len 2010837    off 2893508
+
-- 
2.39.3