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================
bpftool-map
================
-------------------------------------------------------------------------------
tool for inspection and simple manipulation of eBPF maps
-------------------------------------------------------------------------------
:Manual section: 8
SYNOPSIS
========
**bpftool** [*OPTIONS*] **map** *COMMAND*
*OPTIONS* := { { **-j** | **--json** } [{ **-p** | **--pretty** }] | { **-f** | **--bpffs** } }
*COMMANDS* :=
{ **show** | **list** | **dump** | **update** | **lookup** | **getnext** | **delete**
| **pin** | **help** }
MAP COMMANDS
=============
| **bpftool** **map { show | list }** [*MAP*]
| **bpftool** **map dump** *MAP*
| **bpftool** **map update** *MAP* **key** *DATA* **value** *VALUE* [*UPDATE_FLAGS*]
| **bpftool** **map lookup** *MAP* **key** *DATA*
| **bpftool** **map getnext** *MAP* [**key** *DATA*]
| **bpftool** **map delete** *MAP* **key** *DATA*
| **bpftool** **map pin** *MAP* *FILE*
| **bpftool** **map event_pipe** *MAP* [**cpu** *N* **index** *M*]
| **bpftool** **map help**
|
| *MAP* := { **id** *MAP_ID* | **pinned** *FILE* }
| *DATA* := { [**hex**] *BYTES* }
| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* }
| *VALUE* := { *DATA* | *MAP* | *PROG* }
| *UPDATE_FLAGS* := { **any** | **exist** | **noexist** }
DESCRIPTION
===========
**bpftool map { show | list }** [*MAP*]
Show information about loaded maps. If *MAP* is specified
show information only about given map, otherwise list all
maps currently loaded on the system.
Output will start with map ID followed by map type and
zero or more named attributes (depending on kernel version).
**bpftool map dump** *MAP*
Dump all entries in a given *MAP*.
**bpftool map update** *MAP* **key** *DATA* **value** *VALUE* [*UPDATE_FLAGS*]
Update map entry for a given *KEY*.
*UPDATE_FLAGS* can be one of: **any** update existing entry
or add if doesn't exit; **exist** update only if entry already
exists; **noexist** update only if entry doesn't exist.
If the **hex** keyword is provided in front of the bytes
sequence, the bytes are parsed as hexadeximal values, even if
no "0x" prefix is added. If the keyword is not provided, then
the bytes are parsed as decimal values, unless a "0x" prefix
(for hexadecimal) or a "0" prefix (for octal) is provided.
**bpftool map lookup** *MAP* **key** *DATA*
Lookup **key** in the map.
**bpftool map getnext** *MAP* [**key** *DATA*]
Get next key. If *key* is not specified, get first key.
**bpftool map delete** *MAP* **key** *DATA*
Remove entry from the map.
**bpftool map pin** *MAP* *FILE*
Pin map *MAP* as *FILE*.
Note: *FILE* must be located in *bpffs* mount.
**bpftool** **map event_pipe** *MAP* [**cpu** *N* **index** *M*]
Read events from a BPF_MAP_TYPE_PERF_EVENT_ARRAY map.
Install perf rings into a perf event array map and dump
output of any bpf_perf_event_output() call in the kernel.
By default read the number of CPUs on the system and
install perf ring for each CPU in the corresponding index
in the array.
If **cpu** and **index** are specified, install perf ring
for given **cpu** at **index** in the array (single ring).
Note that installing a perf ring into an array will silently
replace any existing ring. Any other application will stop
receiving events if it installed its rings earlier.
**bpftool map 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**).
-j, --json
Generate JSON output. For commands that cannot produce JSON, this
option has no effect.
-p, --pretty
Generate human-readable JSON output. Implies **-j**.
-f, --bpffs
Show file names of pinned maps.
EXAMPLES
========
**# bpftool map show**
::
10: hash name some_map flags 0x0
key 4B value 8B max_entries 2048 memlock 167936B
The following three commands are equivalent:
|
| **# bpftool map update id 10 key hex 20 c4 b7 00 value hex 0f ff ff ab 01 02 03 4c**
| **# bpftool map update id 10 key 0x20 0xc4 0xb7 0x00 value 0x0f 0xff 0xff 0xab 0x01 0x02 0x03 0x4c**
| **# bpftool map update id 10 key 32 196 183 0 value 15 255 255 171 1 2 3 76**
**# bpftool map lookup id 10 key 0 1 2 3**
::
key: 00 01 02 03 value: 00 01 02 03 04 05 06 07
**# bpftool map dump id 10**
::
key: 00 01 02 03 value: 00 01 02 03 04 05 06 07
key: 0d 00 07 00 value: 02 00 00 00 01 02 03 04
Found 2 elements
**# bpftool map getnext id 10 key 0 1 2 3**
::
key:
00 01 02 03
next key:
0d 00 07 00
|
| **# mount -t bpf none /sys/fs/bpf/**
| **# bpftool map pin id 10 /sys/fs/bpf/map**
| **# bpftool map del pinned /sys/fs/bpf/map key 13 00 07 00**
SEE ALSO
========
**bpftool**\ (8), **bpftool-prog**\ (8), **bpftool-cgroup**\ (8)
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