xsk_pool_get_chunk_size
xsk_pool_get_chunk_size(pool) <= 0xffff;
xsk->chunk_size = xsk_pool_get_chunk_size(pool);
return xsk_pool_get_chunk_size(pool) - xsk_pool_get_headroom(pool);
return pool->unaligned ? 0 : xsk_pool_get_chunk_size(pool);