rps_tag_to_mask
index = hash & rps_tag_to_mask(tag_ptr);
unsigned int index = hash & rps_tag_to_mask(tag_ptr);
flow_id = hash & rps_tag_to_mask(global_tag_ptr);
size = o_tag_ptr ? rps_tag_to_mask(o_tag_ptr) + 1 : 0;