forked from Minki/linux
c8caa0bb4b
Bring minor improvements to bpftool documentation. Fix or harmonise
formatting, update map types (including in interactive help), improve
description for "map create", fix a build warning due to a missing line
after the double-colon for the "bpftool prog profile" example,
complete/harmonise/sort the list of related bpftool man pages in
footers.
v2:
- Remove (instead of changing) mark-up on "value" in bpftool-map.rst,
when it does not refer to something passed on the command line.
- Fix an additional typo ("hexadeximal") in the same file.
Signed-off-by: Quentin Monnet <quentin@isovalent.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200511161536.29853-3-quentin@isovalent.com
82 lines
2.0 KiB
ReStructuredText
82 lines
2.0 KiB
ReStructuredText
============
|
|
bpftool-iter
|
|
============
|
|
-------------------------------------------------------------------------------
|
|
tool to create BPF iterators
|
|
-------------------------------------------------------------------------------
|
|
|
|
:Manual section: 8
|
|
|
|
SYNOPSIS
|
|
========
|
|
|
|
**bpftool** [*OPTIONS*] **iter** *COMMAND*
|
|
|
|
*COMMANDS* := { **pin** | **help** }
|
|
|
|
ITER COMMANDS
|
|
===================
|
|
|
|
| **bpftool** **iter pin** *OBJ* *PATH*
|
|
| **bpftool** **iter help**
|
|
|
|
|
| *OBJ* := /a/file/of/bpf_iter_target.o
|
|
|
|
DESCRIPTION
|
|
===========
|
|
**bpftool iter pin** *OBJ* *PATH*
|
|
A bpf iterator combines a kernel iterating of
|
|
particular kernel data (e.g., tasks, bpf_maps, etc.)
|
|
and a bpf program called for each kernel data object
|
|
(e.g., one task, one bpf_map, etc.). User space can
|
|
*read* kernel iterator output through *read()* syscall.
|
|
|
|
The *pin* command creates a bpf iterator from *OBJ*,
|
|
and pin it to *PATH*. The *PATH* should be located
|
|
in *bpffs* mount. It must not contain a dot
|
|
character ('.'), which is reserved for future extensions
|
|
of *bpffs*.
|
|
|
|
User can then *cat PATH* to see the bpf iterator output.
|
|
|
|
**bpftool iter help**
|
|
Print short help message.
|
|
|
|
OPTIONS
|
|
=======
|
|
-h, --help
|
|
Print short generic help message (similar to **bpftool help**).
|
|
|
|
-V, --version
|
|
Print version number (similar to **bpftool version**).
|
|
|
|
-d, --debug
|
|
Print all logs available, even debug-level information. This
|
|
includes logs from libbpf as well as from the verifier, when
|
|
attempting to load programs.
|
|
|
|
EXAMPLES
|
|
========
|
|
**# bpftool iter pin bpf_iter_netlink.o /sys/fs/bpf/my_netlink**
|
|
|
|
::
|
|
|
|
Create a file-based bpf iterator from bpf_iter_netlink.o and pin it
|
|
to /sys/fs/bpf/my_netlink
|
|
|
|
SEE ALSO
|
|
========
|
|
**bpf**\ (2),
|
|
**bpf-helpers**\ (7),
|
|
**bpftool**\ (8),
|
|
**bpftool-btf**\ (8),
|
|
**bpftool-cgroup**\ (8),
|
|
**bpftool-feature**\ (8),
|
|
**bpftool-gen**\ (8),
|
|
**bpftool-link**\ (8),
|
|
**bpftool-map**\ (8),
|
|
**bpftool-net**\ (8),
|
|
**bpftool-perf**\ (8),
|
|
**bpftool-prog**\ (8),
|
|
**bpftool-struct_ops**\ (8)
|