eBPF toy code examples (running in kernel) to familiarize yourself

with syntax and features:

- BTF defined map examples

 - bpf_graft.c		-> Demo on altering runtime behaviour

 - bpf_shared.c 	-> Ingress/egress map sharing example

 - bpf_map_in_map.c	-> Using map in map example

- legacy struct bpf_elf_map defined map examples

 - legacy/bpf_shared.c		-> Ingress/egress map sharing example

 - legacy/bpf_tailcall.c	-> Using tail call chains

 - legacy/bpf_cyclic.c		-> Simple cycle as tail calls

 - legacy/bpf_graft.c		-> Demo on altering runtime behaviour

 - legacy/bpf_map_in_map.c	-> Using map in map example

Note: Users should use new BTF way to defined the maps, the examples

in legacy folder which is using struct bpf_elf_map defined maps is not

recommanded.