bwi_node
struct bwi_node *bn = (struct bwi_node *)ni;
ieee80211_amrr_node_init(&sc->sc_amrr, &((struct bwi_node *)ni)->amn);
struct bwi_node *bn;
bn = malloc(sizeof(struct bwi_node), M_80211_NODE, M_NOWAIT | M_ZERO);
struct bwi_node *bn = (struct bwi_node *)tb->tb_ni;