MT_RXWI_RATE_INDEX
rateval = FIELD_PREP(MT_RXWI_RATE_INDEX, rate_idx);
u8 idx = FIELD_GET(MT_RXWI_RATE_INDEX, rate);
u8 idx = FIELD_GET(MT_RXWI_RATE_INDEX, rate);
(le16_to_cpu(txwi->rate) & MT_RXWI_RATE_INDEX) |