/*
* Update ni->in_txrate.
*/
void
ieee80211_amrr_choose(struct ieee80211_amrr *amrr, struct ieee80211_node *ni,
struct ieee80211_amrr_node *amn)
{
int need_change = 0;
uint8_t rate;
if (is_success(amn) && is_enough(amn)) {
amn->amn_success++;
if (amn->amn_success >= amn->amn_success_threshold &&
!is_max_rate(ni)) {
amn->amn_recovery = 1;
amn->amn_success = 0;
increase_rate(ni);
rate = ni->in_rates.ir_rates[ni->in_txrate] &
IEEE80211_RATE_VAL;
ieee80211_dbg(IEEE80211_MSG_XRATE,
"AMRR increasing rate %d (txcnt=%d retrycnt=%d)",
rate, amn->amn_txcnt, amn->amn_retrycnt);
DTRACE_PROBE4(amrr__increase__rate,
struct ieee80211_node *, ni,
uint8_t, rate,
uint_t, amn->amn_txcnt,
uint_t, amn->amn_retrycnt);
need_change = 1;
} else {
/*
* Examine and potentially adjust the transmit rate.
*/
static void
ath_rate_ctl(void *arg, struct ieee80211_node *ni)
{
struct ath_softc *sc = arg;
struct amrr_node *amn = ATH_NODE_AMRR(ATH_NODE (ni));
int old_rate;
#define is_success(amn) \
(amn->amn_tx_try1_cnt < (amn->amn_tx_try0_cnt/10))
#define is_enough(amn) \
(amn->amn_tx_try0_cnt > 10)
#define is_failure(amn) \
(amn->amn_tx_try1_cnt > (amn->amn_tx_try0_cnt/3))
#define is_max_rate(ni) \
((ni->ni_txrate + 1) >= ni->ni_rates.rs_nrates)
#define is_min_rate(ni) \
(ni->ni_txrate == 0)
old_rate = ni->ni_txrate;
DPRINTF (sc, "cnt0: %d cnt1: %d cnt2: %d cnt3: %d -- threshold: %d\n",
amn->amn_tx_try0_cnt,
amn->amn_tx_try1_cnt,
amn->amn_tx_try2_cnt,
amn->amn_tx_try3_cnt,
amn->amn_success_threshold);
if (is_success (amn) && is_enough (amn)) {
amn->amn_success++;
if (amn->amn_success == amn->amn_success_threshold &&
!is_max_rate (ni)) {
amn->amn_recovery = 1;
amn->amn_success = 0;
ni->ni_txrate++;
DPRINTF (sc, "increase rate to %d\n", ni->ni_txrate);
} else {
amn->amn_recovery = 0;
}
} else if (is_failure (amn)) {
amn->amn_success = 0;
if (!is_min_rate (ni)) {
if (amn->amn_recovery) {
/* recovery failure. */
amn->amn_success_threshold *= 2;
amn->amn_success_threshold = min (amn->amn_success_threshold,
(u_int)ath_rate_max_success_threshold);
DPRINTF (sc, "decrease rate recovery thr: %d\n", amn->amn_success_threshold);
} else {
/* simple failure. */
amn->amn_success_threshold = ath_rate_min_success_threshold;
DPRINTF (sc, "decrease rate normal thr: %d\n", amn->amn_success_threshold);
}
amn->amn_recovery = 0;
ni->ni_txrate--;
} else {
amn->amn_recovery = 0;
}
}
if (is_enough (amn) || old_rate != ni->ni_txrate) {
/* reset counters. */
amn->amn_tx_try0_cnt = 0;
amn->amn_tx_try1_cnt = 0;
amn->amn_tx_try2_cnt = 0;
amn->amn_tx_try3_cnt = 0;
amn->amn_tx_failure_cnt = 0;
}
if (old_rate != ni->ni_txrate) {
ath_rate_update(sc, ni, ni->ni_txrate);
}
}
