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Simplify the retry code and make it more efficient by waiting first, instead of trying immediately which always fails due to the asynchronous nature of xsk socket close. Also decrease the wait time to significantly lower the run-time of the test suite. Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20210825093722.10219-6-magnus.karlsson@gmail.com