/**
* ath5k_ani_lower_immunity() - Decrease noise immunity
* @ah: The &struct ath5k_hw
* @as: The &struct ath5k_ani_state
*
* Try to lower noise immunity (=increase sensitivity) in several steps
* depending on the average RSSI of the beacons we received.
*/
static void
ath5k_ani_lower_immunity(struct ath5k_hw *ah, struct ath5k_ani_state *as)
{
int rssi = ewma_read(&ah->ah_beacon_rssi_avg);
ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI, "lower immunity");
if (ah->opmode == NL80211_IFTYPE_AP) {
/* AP mode */
if (as->firstep_level > 0) {
ath5k_ani_set_firstep_level(ah, as->firstep_level - 1);
return;
}
} else {
/* STA and IBSS mode (see TODO above) */
if (rssi > ATH5K_ANI_RSSI_THR_HIGH) {
/* beacon signal is high, leave OFDM weak signal
* detection off or it may oscillate
* TODO: who said it's off??? */
} else if (rssi > ATH5K_ANI_RSSI_THR_LOW) {
/* beacon RSSI is mid-range: turn on ODFM weak signal
* detection and next, lower firstep level */
if (as->ofdm_weak_sig == false) {
ath5k_ani_set_ofdm_weak_signal_detection(ah,
true);
return;
}
if (as->firstep_level > 0) {
ath5k_ani_set_firstep_level(ah,
as->firstep_level - 1);
return;
}
} else {
/* beacon signal is low: only reduce firstep level */
if (as->firstep_level > 0) {
ath5k_ani_set_firstep_level(ah,
as->firstep_level - 1);
return;
}
}
}
/* all modes */
if (as->spur_level > 0) {
ath5k_ani_set_spur_immunity_level(ah, as->spur_level - 1);
return;
}
/* finally, reduce noise immunity */
if (as->noise_imm_level > 0) {
ath5k_ani_set_noise_immunity_level(ah, as->noise_imm_level - 1);
return;
}
}
static void
ath5k_ani_lower_immunity(struct ath5k_hw *ah, struct ath5k_ani_state *as)
{
int rssi = ewma_read(&ah->ah_beacon_rssi_avg);
ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI, "lower immunity");
if (ah->opmode == NL80211_IFTYPE_AP) {
if (as->firstep_level > 0) {
ath5k_ani_set_firstep_level(ah, as->firstep_level - 1);
return;
}
} else {
if (rssi > ATH5K_ANI_RSSI_THR_HIGH) {
} else if (rssi > ATH5K_ANI_RSSI_THR_LOW) {
if (!as->ofdm_weak_sig) {
ath5k_ani_set_ofdm_weak_signal_detection(ah,
true);
return;
}
if (as->firstep_level > 0) {
ath5k_ani_set_firstep_level(ah,
as->firstep_level - 1);
return;
}
} else {
if (as->firstep_level > 0) {
ath5k_ani_set_firstep_level(ah,
as->firstep_level - 1);
return;
}
}
}
if (as->spur_level > 0) {
ath5k_ani_set_spur_immunity_level(ah, as->spur_level - 1);
return;
}
if (as->noise_imm_level > 0) {
ath5k_ani_set_noise_immunity_level(ah, as->noise_imm_level - 1);
return;
}
}
/**
* ath5k_ani_raise_immunity() - Increase noise immunity
* @ah: The &struct ath5k_hw
* @as: The &struct ath5k_ani_state
* @ofdm_trigger: If this is true we are called because of too many OFDM errors,
* the algorithm will tune more parameters then.
*
* Try to raise noise immunity (=decrease sensitivity) in several steps
* depending on the average RSSI of the beacons we received.
*/
static void
ath5k_ani_raise_immunity(struct ath5k_hw *ah, struct ath5k_ani_state *as,
bool ofdm_trigger)
{
int rssi = ewma_read(&ah->ah_beacon_rssi_avg);
ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI, "raise immunity (%s)",
ofdm_trigger ? "ODFM" : "CCK");
/* first: raise noise immunity */
if (as->noise_imm_level < ATH5K_ANI_MAX_NOISE_IMM_LVL) {
ath5k_ani_set_noise_immunity_level(ah, as->noise_imm_level + 1);
return;
}
/* only OFDM: raise spur immunity level */
if (ofdm_trigger &&
as->spur_level < ah->ani_state.max_spur_level) {
ath5k_ani_set_spur_immunity_level(ah, as->spur_level + 1);
return;
}
/* AP mode */
if (ah->opmode == NL80211_IFTYPE_AP) {
if (as->firstep_level < ATH5K_ANI_MAX_FIRSTEP_LVL)
ath5k_ani_set_firstep_level(ah, as->firstep_level + 1);
return;
}
/* STA and IBSS mode */
/* TODO: for IBSS mode it would be better to keep a beacon RSSI average
* per each neighbour node and use the minimum of these, to make sure we
* don't shut out a remote node by raising immunity too high. */
if (rssi > ATH5K_ANI_RSSI_THR_HIGH) {
ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI,
"beacon RSSI high");
/* only OFDM: beacon RSSI is high, we can disable ODFM weak
* signal detection */
if (ofdm_trigger && as->ofdm_weak_sig == true) {
ath5k_ani_set_ofdm_weak_signal_detection(ah, false);
ath5k_ani_set_spur_immunity_level(ah, 0);
return;
}
/* as a last resort or CCK: raise firstep level */
if (as->firstep_level < ATH5K_ANI_MAX_FIRSTEP_LVL) {
ath5k_ani_set_firstep_level(ah, as->firstep_level + 1);
return;
}
} else if (rssi > ATH5K_ANI_RSSI_THR_LOW) {
/* beacon RSSI in mid range, we need OFDM weak signal detect,
* but can raise firstep level */
ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI,
"beacon RSSI mid");
if (ofdm_trigger && as->ofdm_weak_sig == false)
ath5k_ani_set_ofdm_weak_signal_detection(ah, true);
if (as->firstep_level < ATH5K_ANI_MAX_FIRSTEP_LVL)
ath5k_ani_set_firstep_level(ah, as->firstep_level + 1);
return;
} else if (ah->ah_current_channel->band == IEEE80211_BAND_2GHZ) {
/* beacon RSSI is low. in B/G mode turn of OFDM weak signal
* detect and zero firstep level to maximize CCK sensitivity */
ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI,
"beacon RSSI low, 2GHz");
if (ofdm_trigger && as->ofdm_weak_sig == true)
ath5k_ani_set_ofdm_weak_signal_detection(ah, false);
if (as->firstep_level > 0)
ath5k_ani_set_firstep_level(ah, 0);
return;
}
/* TODO: why not?:
if (as->cck_weak_sig == true) {
ath5k_ani_set_cck_weak_signal_detection(ah, false);
}
*/
}
static void
ath5k_ani_raise_immunity(struct ath5k_hw *ah, struct ath5k_ani_state *as,
bool ofdm_trigger)
{
int rssi = ewma_read(&ah->ah_beacon_rssi_avg);
ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI, "raise immunity (%s)",
ofdm_trigger ? "ODFM" : "CCK");
if (as->noise_imm_level < ATH5K_ANI_MAX_NOISE_IMM_LVL) {
ath5k_ani_set_noise_immunity_level(ah, as->noise_imm_level + 1);
return;
}
if (ofdm_trigger &&
as->spur_level < ah->ani_state.max_spur_level) {
ath5k_ani_set_spur_immunity_level(ah, as->spur_level + 1);
return;
}
if (ah->opmode == NL80211_IFTYPE_AP) {
if (as->firstep_level < ATH5K_ANI_MAX_FIRSTEP_LVL)
ath5k_ani_set_firstep_level(ah, as->firstep_level + 1);
return;
}
if (rssi > ATH5K_ANI_RSSI_THR_HIGH) {
ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI,
"beacon RSSI high");
if (ofdm_trigger && as->ofdm_weak_sig) {
ath5k_ani_set_ofdm_weak_signal_detection(ah, false);
ath5k_ani_set_spur_immunity_level(ah, 0);
return;
}
if (as->firstep_level < ATH5K_ANI_MAX_FIRSTEP_LVL) {
ath5k_ani_set_firstep_level(ah, as->firstep_level + 1);
return;
}
} else if (rssi > ATH5K_ANI_RSSI_THR_LOW) {
ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI,
"beacon RSSI mid");
if (ofdm_trigger && !as->ofdm_weak_sig)
ath5k_ani_set_ofdm_weak_signal_detection(ah, true);
if (as->firstep_level < ATH5K_ANI_MAX_FIRSTEP_LVL)
ath5k_ani_set_firstep_level(ah, as->firstep_level + 1);
return;
} else if (ah->ah_current_channel->band == IEEE80211_BAND_2GHZ) {
ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI,
"beacon RSSI low, 2GHz");
if (ofdm_trigger && as->ofdm_weak_sig)
ath5k_ani_set_ofdm_weak_signal_detection(ah, false);
if (as->firstep_level > 0)
ath5k_ani_set_firstep_level(ah, 0);
return;
}
}
