bpftool: add push and enqueue commands
This is intended to be used with queues and stacks and be more user-friendly than 'update' without the key. Example: bpftool map create /sys/fs/bpf/q type queue value 4 entries 10 name q bpftool map push pinned /sys/fs/bpf/q value 0 1 2 3 bpftool map peek pinned /sys/fs/bpf/q value: 00 01 02 03 bpftool map create /sys/fs/bpf/s type stack value 4 entries 10 name s bpftool map enqueue pinned /sys/fs/bpf/s value 0 1 2 3 bpftool map peek pinned /sys/fs/bpf/s value: 00 01 02 03 Signed-off-by: Stanislav Fomichev <sdf@google.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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