BUF_AGGR
#define bf_isaggr(bf) (bf->bf_state.bf_type & BUF_AGGR)
bool aggr = !!(bf->bf_state.bf_type & BUF_AGGR);
bf->bf_state.bf_type &= ~BUF_AGGR;
bf->bf_state.bf_type = BUF_AMPDU | BUF_AGGR;