/*
* Reset the rate control state for each 802.11 state transition.
*/
static void
ath_rate_newstate(struct ieee80211vap *vap, enum ieee80211_state state)
{
struct ieee80211com *ic = vap->iv_ic;
struct ath_softc *sc = ic->ic_dev->priv;
struct ieee80211_node *ni;
if (state == IEEE80211_S_INIT)
return;
if (vap->iv_opmode == IEEE80211_M_STA) {
/*
* Reset local xmit state; this is really only
* meaningful when operating in station mode.
*/
ni = vap->iv_bss;
if (state == IEEE80211_S_RUN) {
ath_rate_ctl_start(sc, ni);
} else {
ath_rate_update(sc, ni, 0);
}
} else {
/*
* When operating as a station the node table holds
* the AP's that were discovered during scanning.
* For any other operating mode we want to reset the
* tx rate state of each node.
*/
ieee80211_iterate_nodes(&ic->ic_sta, ath_rate_cb, NULL);
ath_rate_update(sc, vap->iv_bss, 0);
}
}
static void
ath_rate_cb(void *arg, struct ieee80211_node *ni)
{
struct ath_softc *sc = arg;
ath_rate_update(sc, ni, 0);
}
/*
* Reset the rate control state for each 802.11 state transition.
*/
void
ath_rate_newstate(struct ath_softc *sc, enum ieee80211_state state)
{
struct onoe_softc *osc = (struct onoe_softc *) sc->sc_rc;
struct ieee80211com *ic = &sc->sc_ic;
struct ieee80211_node *ni;
if (state == IEEE80211_S_INIT) {
callout_stop(&osc->timer);
return;
}
if (ic->ic_opmode == IEEE80211_M_STA) {
/*
* Reset local xmit state; this is really only
* meaningful when operating in station mode.
*/
ni = ic->ic_bss;
if (state == IEEE80211_S_RUN) {
ath_rate_ctl_start(sc, ni);
} else {
ath_rate_update(sc, ni, 0);
}
} else {
/*
* When operating as a station the node table holds
* the AP's that were discovered during scanning.
* For any other operating mode we want to reset the
* tx rate state of each node.
*/
ieee80211_iterate_nodes(&ic->ic_sta, ath_rate_cb, sc);
ath_rate_update(sc, ic->ic_bss, 0);
}
if (ic->ic_fixed_rate == IEEE80211_FIXED_RATE_NONE &&
state == IEEE80211_S_RUN) {
int interval;
/*
* Start the background rate control thread if we
* are not configured to use a fixed xmit rate.
*/
interval = ath_rateinterval;
if (ic->ic_opmode == IEEE80211_M_STA)
interval /= 2;
callout_reset(&osc->timer, (interval * hz) / 1000,
ath_ratectl, &sc->sc_if);
}
}
/*
* Reset the rate control state for each 802.11 state transition.
*/
void
ath_rate_newstate(struct ath_softc *sc, enum ieee80211_state state)
{
struct amrr_softc *asc = (struct amrr_softc *) sc->sc_rc;
struct ieee80211com *ic = &sc->sc_ic;
struct ieee80211_node *ni;
if (state == IEEE80211_S_INIT) {
del_timer(&asc->timer);
return;
}
if (ic->ic_opmode == IEEE80211_M_STA) {
/*
* Reset local xmit state; this is really only
* meaningful when operating in station mode.
*/
ni = ic->ic_bss;
if (state == IEEE80211_S_RUN) {
ath_rate_ctl_start(sc, ni);
} else {
ath_rate_update(sc, ni, 0);
}
} else {
/*
* When operating as a station the node table holds
* the AP's that were discovered during scanning.
* For any other operating mode we want to reset the
* tx rate state of each node.
*/
TAILQ_FOREACH(ni, &ic->ic_node, ni_list)
ath_rate_update(sc, ni, 0); /* use lowest rate */
ath_rate_update(sc, ic->ic_bss, 0);
}
if (ic->ic_fixed_rate == -1 && state == IEEE80211_S_RUN) {
int interval;
/*
* Start the background rate control thread if we
* are not configured to use a fixed xmit rate.
*/
interval = ath_rateinterval;
if (ic->ic_opmode == IEEE80211_M_STA)
interval /= 2;
mod_timer(&asc->timer, jiffies + ((HZ * interval) / 1000));
}
}
/*
* Set the starting transmit rate for a node.
*/
static void
ath_rate_ctl_start(struct ath_softc *sc, struct ieee80211_node *ni)
{
#define RATE(_ix) (ni->ni_rates.rs_rates[(_ix)] & IEEE80211_RATE_VAL)
const struct ieee80211_txparam *tp = ni->ni_txparms;
int srate;
KASSERT(ni->ni_rates.rs_nrates > 0, ("no rates"));
if (tp == NULL || tp->ucastrate == IEEE80211_FIXED_RATE_NONE) {
/*
* No fixed rate is requested. For 11b start with
* the highest negotiated rate; otherwise, for 11g
* and 11a, we start "in the middle" at 24Mb or 36Mb.
*/
srate = ni->ni_rates.rs_nrates - 1;
if (sc->sc_curmode != IEEE80211_MODE_11B) {
/*
* Scan the negotiated rate set to find the
* closest rate.
*/
/* NB: the rate set is assumed sorted */
for (; srate >= 0 && RATE(srate) > 72; srate--)
;
}
} else {
/*
* A fixed rate is to be used; ic_fixed_rate is the
* IEEE code for this rate (sans basic bit). Convert this
* to the index into the negotiated rate set for
* the node. We know the rate is there because the
* rate set is checked when the station associates.
*/
/* NB: the rate set is assumed sorted */
srate = ni->ni_rates.rs_nrates - 1;
for (; srate >= 0 && RATE(srate) != tp->ucastrate; srate--)
;
}
/*
* The selected rate may not be available due to races
* and mode settings. Also orphaned nodes created in
* adhoc mode may not have any rate set so this lookup
* can fail. This is not fatal.
*/
ath_rate_update(sc, ni, srate < 0 ? 0 : srate);
#undef RATE
}
/*
* Set the starting transmit rate for a node.
*/
static void
ath_rate_ctl_start(struct ath_softc *sc, struct ieee80211_node *ni)
{
#define RATE(_ix) (ni->ni_rates.rs_rates[(_ix)] & IEEE80211_RATE_VAL)
struct ieee80211com *ic = &sc->sc_ic;
int srate;
KASSERT(ni->ni_rates.rs_nrates > 0, ("no rates"));
if (ic->ic_fixed_rate == IEEE80211_FIXED_RATE_NONE) {
/*
* No fixed rate is requested. For 11b start with
* the highest negotiated rate; otherwise, for 11g
* and 11a, we start "in the middle" at 24Mb or 36Mb.
*/
srate = ni->ni_rates.rs_nrates - 1;
if (sc->sc_curmode != IEEE80211_MODE_11B) {
/*
* Scan the negotiated rate set to find the
* closest rate.
*/
/* NB: the rate set is assumed sorted */
for (; srate >= 0 && RATE(srate) > 72; srate--)
;
KASSERT(srate >= 0, ("bogus rate set"));
}
} else {
/*
* A fixed rate is to be used; ic_fixed_rate is an
* index into the supported rate set. Convert this
* to the index into the negotiated rate set for
* the node. We know the rate is there because the
* rate set is checked when the station associates.
*/
const struct ieee80211_rateset *rs =
&ic->ic_sup_rates[ic->ic_curmode];
int r = rs->rs_rates[ic->ic_fixed_rate] & IEEE80211_RATE_VAL;
/* NB: the rate set is assumed sorted */
srate = ni->ni_rates.rs_nrates - 1;
for (; srate >= 0 && RATE(srate) != r; srate--)
;
KASSERT(srate >= 0,
("fixed rate %d not in rate set", ic->ic_fixed_rate));
}
ath_rate_update(sc, ni, srate);
#undef RATE
}
/*
* 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 rix;
#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))
rix = amn->amn_rix;
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
"cnt0: %d cnt1: %d cnt2: %d cnt3: %d -- threshold: %d",
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 &&
rix + 1 < ni->ni_rates.rs_nrates) {
amn->amn_recovery = 1;
amn->amn_success = 0;
rix++;
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
"increase rate to %d", rix);
} else {
amn->amn_recovery = 0;
}
} else if (is_failure (amn)) {
amn->amn_success = 0;
if (rix > 0) {
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);
IEEE80211_NOTE(ni->ni_vap,
IEEE80211_MSG_RATECTL, ni,
"decrease rate recovery thr: %d",
amn->amn_success_threshold);
} else {
/* simple failure. */
amn->amn_success_threshold = ath_rate_min_success_threshold;
IEEE80211_NOTE(ni->ni_vap,
IEEE80211_MSG_RATECTL, ni,
"decrease rate normal thr: %d",
amn->amn_success_threshold);
}
amn->amn_recovery = 0;
rix--;
} else {
amn->amn_recovery = 0;
}
}
if (is_enough (amn) || rix != amn->amn_rix) {
/* 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 (rix != amn->amn_rix) {
ath_rate_update(sc, ni, rix);
}
}
/*
* Examine and potentially adjust the transmit rate.
*/
static void
ath_rate_ctl(void *arg, struct ieee80211_node *ni)
{
struct ath_softc *sc = arg;
struct onoe_node *on = ATH_NODE_ONOE(ATH_NODE(ni));
struct ieee80211_rateset *rs = &ni->ni_rates;
int dir = 0, nrate, enough;
/*
* Rate control
* XXX: very primitive version.
*/
enough = (on->on_tx_ok + on->on_tx_err >= 10);
/* no packet reached -> down */
if (on->on_tx_err > 0 && on->on_tx_ok == 0)
dir = -1;
/* all packets needs retry in average -> down */
if (enough && on->on_tx_ok < on->on_tx_retr)
dir = -1;
/* no error and less than rate_raise% of packets need retry -> up */
if (enough && on->on_tx_err == 0 &&
on->on_tx_retr < (on->on_tx_ok * ath_rate_raise) / 100)
dir = 1;
DPRINTF(sc, "%s: ok %d err %d retr %d upper %d dir %d\n",
ether_sprintf(ni->ni_macaddr),
on->on_tx_ok, on->on_tx_err, on->on_tx_retr,
on->on_tx_upper, dir);
nrate = ni->ni_txrate;
switch (dir) {
case 0:
if (enough && on->on_tx_upper > 0)
on->on_tx_upper--;
break;
case -1:
if (nrate > 0) {
nrate--;
sc->sc_stats.ast_rate_drop++;
}
on->on_tx_upper = 0;
break;
case 1:
/* raise rate if we hit rate_raise_threshold */
if (++on->on_tx_upper < ath_rate_raise_threshold)
break;
on->on_tx_upper = 0;
if (nrate + 1 < rs->rs_nrates) {
nrate++;
sc->sc_stats.ast_rate_raise++;
}
break;
}
if (nrate != ni->ni_txrate) {
DPRINTF(sc, "%s: %dM -> %dM (%d ok, %d err, %d retr)\n",
__func__,
(rs->rs_rates[ni->ni_txrate] & IEEE80211_RATE_VAL) / 2,
(rs->rs_rates[nrate] & IEEE80211_RATE_VAL) / 2,
on->on_tx_ok, on->on_tx_err, on->on_tx_retr);
ath_rate_update(sc, ni, nrate);
} else if (enough)
on->on_tx_ok = on->on_tx_err = on->on_tx_retr = 0;
}
void
ath_rate_node_init(struct ath_softc *sc, struct ath_node *an)
{
/* NB: assumed to be zero'd by caller */
ath_rate_update(sc, &an->an_node, 0);
}
static void
ath_rate_cb(void *arg, struct ieee80211_node *ni)
{
ath_rate_update(ni->ni_ic->ic_dev->priv, ni, (long) arg);
}
/*
* 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);
}
}
