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Introduce the --extra-stats (or simply -x) flag to the xdpsock application which prints additional statistics alongside the regular rx and tx counters. The new statistics printed report error conditions eg. rx ring full, invalid descriptors, etc. Signed-off-by: Ciara Loftus <ciara.loftus@intel.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200708072835.4427-3-ciara.loftus@intel.com