netmap_mem_get_lut
ret = netmap_mem_get_lut(na_dr->nm_mem, &na_dr->na_lut);
error = netmap_mem_get_lut(na->nm_mem, &na->na_lut);
error = netmap_mem_get_lut(hwna->nm_mem, &bna->host.up.na_lut);
error = netmap_mem_get_lut(hwna->nm_mem, &hwna->na_lut);
int netmap_mem_get_lut(struct netmap_mem_d *, struct netmap_lut *);