BPF_MAP_TYPE_UNSPEC 0
BPF_MAP_TYPE_HASH 1
BPF_MAP_TYPE_ARRAY 2
BPF_MAP_TYPE_PROG_ARRAY 3
BPF_MAP_TYPE_PERF_EVENT_ARRAY 4
BPF_MAP_TYPE_PERCPU_HASH 5
BPF_MAP_TYPE_PERCPU_ARRAY 6
BPF_MAP_TYPE_STACK_TRACE 7