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bpftool: make key optional in lookup command

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Bpftool expects key for 'lookup' operations. For some map types, key should
not be specified. Support looking up those map types.

Before:
bpftool map create /sys/fs/bpf/q type queue value 4 entries 10 name q
bpftool map update pinned /sys/fs/bpf/q value 0 1 2 3
bpftool map lookup pinned /sys/fs/bpf/q
Error: did not find key

After:
bpftool map create /sys/fs/bpf/q type queue value 4 entries 10 name q
bpftool map update pinned /sys/fs/bpf/q value 0 1 2 3
bpftool map lookup pinned /sys/fs/bpf/q
key:   value: 00 01 02 03

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Stanislav Fomichev 2019-01-16 11:10:00 -08:00 committed by Daniel Borkmann
parent 7d7209cb9a
commit 8a89fff60a
2 changed files with 5 additions and 9 deletions
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4
tools/bpf/bpftool/Documentation/bpftool-map.rst
View File

@ -26,7 +26,7 @@ MAP COMMANDS
| **entries** *MAX_ENTRIES* **name** *NAME* [**flags** *FLAGS*] [**dev** *NAME*]
| **bpftool** **map dump** *MAP*
| **bpftool** **map update** *MAP* [**key** *DATA*] [**value** *VALUE*] [*UPDATE_FLAGS*]
| **bpftool** **map lookup** *MAP* **key** *DATA*
| **bpftool** **map lookup** *MAP* [**key** *DATA*]
| **bpftool** **map getnext** *MAP* [**key** *DATA*]
| **bpftool** **map delete** *MAP* **key** *DATA*
| **bpftool** **map pin** *MAP* *FILE*
@ -75,7 +75,7 @@ DESCRIPTION
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*
**bpftool map lookup** *MAP* [**key** *DATA*]
Lookup **key** in the map.
**bpftool map getnext** *MAP* [**key** *DATA*]

10
tools/bpf/bpftool/map.c
View File

@ -865,13 +865,9 @@ static int do_lookup(int argc, char **argv)
if (fd < 0)
return -1;
key = malloc(info.key_size);
value = alloc_value(&info);
if (!key || !value) {
p_err("mem alloc failed");
err = -1;
err = alloc_key_value(&info, &key, &value);
if (err)
goto exit_free;
}
err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL);
if (err)
@ -1158,7 +1154,7 @@ static int do_help(int argc, char **argv)
" [dev NAME]\n"
" %s %s dump MAP\n"
" %s %s update MAP [key DATA] [value VALUE] [UPDATE_FLAGS]\n"
" %s %s lookup MAP key DATA\n"
" %s %s lookup MAP [key DATA]\n"
" %s %s getnext MAP [key DATA]\n"
" %s %s delete MAP key DATA\n"
" %s %s pin MAP FILE\n"