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Libbpf's xsk part calls get_channels() API to retrieve the queue count of the underlying driver so that XSKMAP is sized accordingly. Implement that in veth so multi queue scenarios can work properly. Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20210329224316.17793-14-maciej.fijalkowski@intel.com