PPDU_VARIANT
[2] = PPDU_VARIANT(legacy),
[3] = PPDU_VARIANT(ht),
[5] = PPDU_VARIANT(vht_su),
[7] = PPDU_VARIANT(he_su),
[9] = PPDU_VARIANT(he_mu),
[10] = PPDU_VARIANT(he_tb),