RTWN_RIDX_MCS0
for (ridx = RTWN_RIDX_MCS0; ridx <= RTWN_RIDX_MCS15; ridx++) {
for (ridx = RTWN_RIDX_MCS0; ridx <= RTWN_RIDX_MCS15; ridx++) {
for (ridx = RTWN_RIDX_MCS0; ridx < RTWN_RIDX_MCS8; ridx++) {
#define RTWN_RIDX_MCS8 (RTWN_RIDX_MCS0 + 8)