bbr_update_entry
seq_out = bbr_update_entry(tp, bbr, rsm, cts, &len, pacing_time);
seq_out = bbr_update_entry(tp, bbr, rsm, cts, &len, pacing_time);
seq_out = bbr_update_entry(tp, bbr, nrsm, cts, &len, pacing_time);