samples/bpf: Convert XDP samples to libbpf usage
Some of XDP samples that are attaching the bpf program to the interface via libbpf's bpf_set_link_xdp_fd are still using the bpf_load.c for loading and manipulating the ebpf program and maps. Convert them to do this through libbpf usage and remove bpf_load from the picture. While at it remove what looks like debug leftover in xdp_redirect_map_user.c In xdp_redirect_cpu, change the way that the program to be loaded onto interface is chosen - user now needs to pass the program's section name instead of the relative number. In case of typo print out the section names to choose from. Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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