RATE_MAX_WINDOW
if (win->counter >= RATE_MAX_WINDOW) {
win->counter = RATE_MAX_WINDOW - 1;
if (win->data & (1ULL << (RATE_MAX_WINDOW - 1))) {
win->data &= ~(1ULL << (RATE_MAX_WINDOW - 1));
static const u64 mask = (((u64) 1) << (RATE_MAX_WINDOW - 1));
if (win->counter >= RATE_MAX_WINDOW) {
win->counter = RATE_MAX_WINDOW - 1;