samples/bpf: add -c/--copy -z/--zero-copy flags to xdpsock
The -c/--copy -z/--zero-copy flags enforces either copy or zero-copy mode. Signed-off-by: NBjörn Töpel <bjorn.topel@intel.com> Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
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