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bpftool: make key and value optional in update command

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Bpftool expects both key and value for 'update' operations. For some
map types, key should not be specified. Support updating 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
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

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 11:09:59 -08:00 committed by Daniel Borkmann
parent e13279e211
commit 7d7209cb9a
2 changed files with 31 additions and 9 deletions
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4
tools/bpf/bpftool/Documentation/bpftool-map.rst
View File

@ -25,7 +25,7 @@ MAP COMMANDS
| **bpftool** **map create** *FILE* **type** *TYPE* **key** *KEY_SIZE* **value** *VALUE_SIZE* \
| **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 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*
@ -62,7 +62,7 @@ DESCRIPTION
**bpftool map dump** *MAP*
Dump all entries in a given *MAP*.
**bpftool map update** *MAP* **key** *DATA* **value** *VALUE* [*UPDATE_FLAGS*]
**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

36
tools/bpf/bpftool/map.c
View File

@ -779,6 +779,32 @@ exit_free:
return err;
}
static int alloc_key_value(struct bpf_map_info *info, void **key, void **value)
{
*key = NULL;
*value = NULL;
if (info->key_size) {
*key = malloc(info->key_size);
if (!*key) {
p_err("key mem alloc failed");
return -1;
}
}
if (info->value_size) {
*value = alloc_value(info);
if (!*value) {
p_err("value mem alloc failed");
free(*key);
*key = NULL;
return -1;
}
}
return 0;
}
static int do_update(int argc, char **argv)
{
struct bpf_map_info info = {};
@ -795,13 +821,9 @@ static int do_update(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, value, info.key_size,
info.value_size, &flags, &value_fd);
@ -1135,7 +1157,7 @@ static int do_help(int argc, char **argv)
" entries MAX_ENTRIES name NAME [flags FLAGS] \\\n"
" [dev NAME]\n"
" %s %s dump MAP\n"
" %s %s update MAP key DATA value VALUE [UPDATE_FLAGS]\n"
" %s %s update MAP [key DATA] [value VALUE] [UPDATE_FLAGS]\n"
" %s %s lookup MAP key DATA\n"
" %s %s getnext MAP [key DATA]\n"
" %s %s delete MAP key DATA\n"