tree f7e37246eebeb9834f5525ccebc99c29c137bbf4
parent 7d7209cb9afdfc3dfcdc1b45013e62afb1ad71b6
author Stanislav Fomichev <sdf@google.com> 1547665800 -0800
committer Daniel Borkmann <daniel@iogearbox.net> 1547717431 +0100

bpftool: make key optional in lookup command

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>