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authorQuentin Monnet <quentin.monnet@netronome.com>2018-10-20 23:01:48 +0100
committerDaniel Borkmann <daniel@iogearbox.net>2018-10-21 20:45:14 +0200
commit882731e06c669a8626f2d4bfb351ca19264be029 (patch)
tree28f9023b2e3b3c71e9241980bd254e65182bae2e /tools
parentc5fa5d602221362f8341ecd9e32d83194abf5bd9 (diff)
tools: bpftool: document restriction on '.' in names to pin in bpffs
Names used to pin eBPF programs and maps under the eBPF virtual file system cannot contain a dot character, which is reserved for future extensions of this file system. Document this in bpftool man pages to avoid users getting confused if pinning fails because of a dot. Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools')
-rw-r--r--tools/bpf/bpftool/Documentation/bpftool-map.rst4
-rw-r--r--tools/bpf/bpftool/Documentation/bpftool-prog.rst8
2 files changed, 9 insertions, 3 deletions
diff --git a/tools/bpf/bpftool/Documentation/bpftool-map.rst b/tools/bpf/bpftool/Documentation/bpftool-map.rst
index 3497f2d80328..f55a2daed59b 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-map.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-map.rst
@@ -86,7 +86,9 @@ DESCRIPTION
**bpftool map pin** *MAP* *FILE*
Pin map *MAP* as *FILE*.
- Note: *FILE* must be located in *bpffs* mount.
+ Note: *FILE* must be located in *bpffs* mount. It must not
+ contain a dot character ('.'), which is reserved for future
+ extensions of *bpffs*.
**bpftool** **map event_pipe** *MAP* [**cpu** *N* **index** *M*]
Read events from a BPF_MAP_TYPE_PERF_EVENT_ARRAY map.
diff --git a/tools/bpf/bpftool/Documentation/bpftool-prog.rst b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
index 12c803003ab2..ac4e904b10fb 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-prog.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
@@ -75,7 +75,9 @@ DESCRIPTION
**bpftool prog pin** *PROG* *FILE*
Pin program *PROG* as *FILE*.
- Note: *FILE* must be located in *bpffs* mount.
+ Note: *FILE* must be located in *bpffs* mount. It must not
+ contain a dot character ('.'), which is reserved for future
+ extensions of *bpffs*.
**bpftool prog load** *OBJ* *FILE* [**type** *TYPE*] [**map** {**idx** *IDX* | **name** *NAME*} *MAP*] [**dev** *NAME*]
Load bpf program from binary *OBJ* and pin as *FILE*.
@@ -91,7 +93,9 @@ DESCRIPTION
If **dev** *NAME* is specified program will be loaded onto
given networking device (offload).
- Note: *FILE* must be located in *bpffs* mount.
+ Note: *FILE* must be located in *bpffs* mount. It must not
+ contain a dot character ('.'), which is reserved for future
+ extensions of *bpffs*.
**bpftool prog attach** *PROG* *ATTACH_TYPE* *MAP*
Attach bpf program *PROG* (with type specified by *ATTACH_TYPE*)

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