SLOT_TIME
#define PIFS (SIFS + SLOT_TIME)
#define DIFS (PIFS + SLOT_TIME)
erp.slot_time = bss_conf->use_short_slot ? SHORT_SLOT_TIME : SLOT_TIME;
rtl_write_byte(rtlpriv, SLOT_TIME, val[0]);
hif_mib_name(SLOT_TIME) \