/** * 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_init() - Initialize ANI * @ah: The &struct ath5k_hw * @mode: One of enum ath5k_ani_mode * * Initialize ANI according to mode. */ void ath5k_ani_init(struct ath5k_hw *ah, enum ath5k_ani_mode mode) { /* ANI is only possible on 5212 and newer */ if (ah->ah_version < AR5K_AR5212) return; if (mode < ATH5K_ANI_MODE_OFF || mode > ATH5K_ANI_MODE_AUTO) { ATH5K_ERR(ah, "ANI mode %d out of range", mode); return; } /* clear old state information */ memset(&ah->ani_state, 0, sizeof(ah->ani_state)); /* older hardware has more spur levels than newer */ if (ah->ah_mac_srev < AR5K_SREV_AR2414) ah->ani_state.max_spur_level = 7; else ah->ani_state.max_spur_level = 2; /* initial values for our ani parameters */ if (mode == ATH5K_ANI_MODE_OFF) { ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI, "ANI off\n"); } else if (mode == ATH5K_ANI_MODE_MANUAL_LOW) { ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI, "ANI manual low -> high sensitivity\n"); ath5k_ani_set_noise_immunity_level(ah, 0); ath5k_ani_set_spur_immunity_level(ah, 0); ath5k_ani_set_firstep_level(ah, 0); ath5k_ani_set_ofdm_weak_signal_detection(ah, true); ath5k_ani_set_cck_weak_signal_detection(ah, true); } else if (mode == ATH5K_ANI_MODE_MANUAL_HIGH) { ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI, "ANI manual high -> low sensitivity\n"); ath5k_ani_set_noise_immunity_level(ah, ATH5K_ANI_MAX_NOISE_IMM_LVL); ath5k_ani_set_spur_immunity_level(ah, ah->ani_state.max_spur_level); ath5k_ani_set_firstep_level(ah, ATH5K_ANI_MAX_FIRSTEP_LVL); ath5k_ani_set_ofdm_weak_signal_detection(ah, false); ath5k_ani_set_cck_weak_signal_detection(ah, false); } else if (mode == ATH5K_ANI_MODE_AUTO) { ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI, "ANI auto\n"); ath5k_ani_set_noise_immunity_level(ah, 0); ath5k_ani_set_spur_immunity_level(ah, 0); ath5k_ani_set_firstep_level(ah, 0); ath5k_ani_set_ofdm_weak_signal_detection(ah, true); ath5k_ani_set_cck_weak_signal_detection(ah, false); } /* newer hardware has PHY error counter registers which we can use to * get OFDM and CCK error counts. older hardware has to set rxfilter and * report every single PHY error by calling ath5k_ani_phy_error_report() */ if (mode == ATH5K_ANI_MODE_AUTO) { if (ah->ah_capabilities.cap_has_phyerr_counters) ath5k_enable_phy_err_counters(ah); else ath5k_hw_set_rx_filter(ah, ath5k_hw_get_rx_filter(ah) | AR5K_RX_FILTER_PHYERR); } else { if (ah->ah_capabilities.cap_has_phyerr_counters) ath5k_disable_phy_err_counters(ah); else ath5k_hw_set_rx_filter(ah, ath5k_hw_get_rx_filter(ah) & ~AR5K_RX_FILTER_PHYERR); } ah->ani_state.ani_mode = mode; }
/** * 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); } */ }
void ath5k_ani_init(struct ath5k_hw *ah, enum ath5k_ani_mode mode) { if (ah->ah_version < AR5K_AR5212) return; if (mode < ATH5K_ANI_MODE_OFF || mode > ATH5K_ANI_MODE_AUTO) { ATH5K_ERR(ah, "ANI mode %d out of range", mode); return; } memset(&ah->ani_state, 0, sizeof(ah->ani_state)); if (ah->ah_mac_srev < AR5K_SREV_AR2414) ah->ani_state.max_spur_level = 7; else ah->ani_state.max_spur_level = 2; if (mode == ATH5K_ANI_MODE_OFF) { ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI, "ANI off\n"); } else if (mode == ATH5K_ANI_MODE_MANUAL_LOW) { ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI, "ANI manual low -> high sensitivity\n"); ath5k_ani_set_noise_immunity_level(ah, 0); ath5k_ani_set_spur_immunity_level(ah, 0); ath5k_ani_set_firstep_level(ah, 0); ath5k_ani_set_ofdm_weak_signal_detection(ah, true); ath5k_ani_set_cck_weak_signal_detection(ah, true); } else if (mode == ATH5K_ANI_MODE_MANUAL_HIGH) { ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI, "ANI manual high -> low sensitivity\n"); ath5k_ani_set_noise_immunity_level(ah, ATH5K_ANI_MAX_NOISE_IMM_LVL); ath5k_ani_set_spur_immunity_level(ah, ah->ani_state.max_spur_level); ath5k_ani_set_firstep_level(ah, ATH5K_ANI_MAX_FIRSTEP_LVL); ath5k_ani_set_ofdm_weak_signal_detection(ah, false); ath5k_ani_set_cck_weak_signal_detection(ah, false); } else if (mode == ATH5K_ANI_MODE_AUTO) { ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI, "ANI auto\n"); ath5k_ani_set_noise_immunity_level(ah, 0); ath5k_ani_set_spur_immunity_level(ah, 0); ath5k_ani_set_firstep_level(ah, 0); ath5k_ani_set_ofdm_weak_signal_detection(ah, true); ath5k_ani_set_cck_weak_signal_detection(ah, false); } if (mode == ATH5K_ANI_MODE_AUTO) { if (ah->ah_capabilities.cap_has_phyerr_counters) ath5k_enable_phy_err_counters(ah); else ath5k_hw_set_rx_filter(ah, ath5k_hw_get_rx_filter(ah) | AR5K_RX_FILTER_PHYERR); } else { if (ah->ah_capabilities.cap_has_phyerr_counters) ath5k_disable_phy_err_counters(ah); else ath5k_hw_set_rx_filter(ah, ath5k_hw_get_rx_filter(ah) & ~AR5K_RX_FILTER_PHYERR); } ah->ani_state.ani_mode = mode; }
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; } }