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tools: bpftool: add "bpftool map freeze" subcommand

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Add a new subcommand to freeze maps from user space.

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
2019-08-21 09:52:19 +01:00
committed by Daniel Borkmann
parent c354ff2ef2
commit 0bb52b0dfc
3 changed files with 44 additions and 3 deletions
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9
tools/bpf/bpftool/Documentation/bpftool-map.rst
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@@ -36,6 +36,7 @@ MAP COMMANDS
| **bpftool** **map pop** *MAP*
| **bpftool** **map enqueue** *MAP* **value** *VALUE*
| **bpftool** **map dequeue** *MAP*
| **bpftool** **map freeze** *MAP*
| **bpftool** **map help**
|
| *MAP* := { **id** *MAP_ID* | **pinned** *FILE* }
@@ -127,6 +128,14 @@ DESCRIPTION
**bpftool map dequeue** *MAP*
Dequeue and print **value** from the queue.
**bpftool map freeze** *MAP*
Freeze the map as read-only from user space. Entries from a
frozen map can not longer be updated or deleted with the
**bpf\ ()** system call. This operation is not reversible,
and the map remains immutable from user space until its
destruction. However, read and write permissions for BPF
programs to the map remain unchanged.
**bpftool map help**
Print short help message.