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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>
This commit is contained in:
Quentin Monnet 2018-10-20 23:01:48 +01:00 committed by Daniel Borkmann
parent c5fa5d6022
commit 882731e06c
2 changed files with 9 additions and 3 deletions
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4
tools/bpf/bpftool/Documentation/bpftool-map.rst
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@ -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.

8
tools/bpf/bpftool/Documentation/bpftool-prog.rst
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@ -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*)