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Add a selftest for the bpf_csum_diff() helper. This selftests runs the helper in all three configurations(push, pull, and diff) and verifies its output. The correct results have been computed by hand and by the helper's older implementation. Signed-off-by: Puranjay Mohan <puranjay@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20241026125339.26459-5-puranjay@kernel.org