From 99319b8c23f183cdc7a0652ed40f879f82cf8941 Mon Sep 17 00:00:00 2001 From: Gregory Greenman Date: Tue, 24 Nov 2015 19:13:27 +0200 Subject: [PATCH] iwlwifi: mvm: add an option to start rs from HT/VHT rates Extend the configurable option of setting initial rate to RSSI based. Make the initial rate to be set to VHT/HT SISO or legacy depending on the AP capabilities. Signed-off-by: Gregory Greenman Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/intel/iwlwifi/mvm/rs.c | 67 ++++++++++++++++----- 1 file changed, 52 insertions(+), 15 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c index 54789bd3b352..feb775a8223a 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c @@ -2550,6 +2550,8 @@ static const struct rs_init_rate_info rs_optimal_rates_vht_40_80mhz[] = { { S8_MIN, IWL_RATE_MCS_0_INDEX }, }; +#define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ + /* Init the optimal rate based on STA caps * This combined with rssi is used to report the last tx rate * to userspace when we haven't transmitted enough frames. @@ -2635,11 +2637,13 @@ static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, * of last Rx */ static void rs_get_initial_rate(struct iwl_mvm *mvm, + struct ieee80211_sta *sta, struct iwl_lq_sta *lq_sta, enum ieee80211_band band, struct rs_rate *rate) { int i, nentries; + unsigned long active_rate; s8 best_rssi = S8_MIN; u8 best_ant = ANT_NONE; u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); @@ -2680,19 +2684,55 @@ static void rs_get_initial_rate(struct iwl_mvm *mvm, nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); } - if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) { - for (i = 0; i < nentries; i++) { - int rate_idx = initial_rates[i].rate_idx; - if ((best_rssi >= initial_rates[i].rssi) && - (BIT(rate_idx) & lq_sta->active_legacy_rate)) { - rate->index = rate_idx; - break; - } + if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) + goto out; + + /* Start from a higher rate if the corresponding debug capability + * is enabled. The rate is chosen according to AP capabilities. + * In case of VHT/HT when the rssi is low fallback to the case of + * legacy rates. + */ + if (sta->vht_cap.vht_supported && + best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { + if (sta->bandwidth >= IEEE80211_STA_RX_BW_40) { + initial_rates = rs_optimal_rates_vht_40_80mhz; + nentries = ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz); + if (sta->bandwidth >= IEEE80211_STA_RX_BW_80) + rate->bw = RATE_MCS_CHAN_WIDTH_80; + else + rate->bw = RATE_MCS_CHAN_WIDTH_40; + } else if (sta->bandwidth == IEEE80211_STA_RX_BW_20) { + initial_rates = rs_optimal_rates_vht_20mhz; + nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); + rate->bw = RATE_MCS_CHAN_WIDTH_20; + } else { + IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); + goto out; } + active_rate = lq_sta->active_siso_rate; + rate->type = LQ_VHT_SISO; + } else if (sta->ht_cap.ht_supported && + best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { + initial_rates = rs_optimal_rates_ht; + nentries = ARRAY_SIZE(rs_optimal_rates_ht); + active_rate = lq_sta->active_siso_rate; + rate->type = LQ_HT_SISO; + } else { + active_rate = lq_sta->active_legacy_rate; } - IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index, - rs_pretty_ant(rate->ant)); + for (i = 0; i < nentries; i++) { + int rate_idx = initial_rates[i].rate_idx; + + if ((best_rssi >= initial_rates[i].rssi) && + (BIT(rate_idx) & active_rate)) { + rate->index = rate_idx; + break; + } + } + +out: + rs_dump_rate(mvm, rate, "INITIAL"); } /* Save info about RSSI of last Rx */ @@ -2752,14 +2792,11 @@ static void rs_initialize_lq(struct iwl_mvm *mvm, tbl = &(lq_sta->lq_info[active_tbl]); rate = &tbl->rate; - rs_get_initial_rate(mvm, lq_sta, band, rate); + rs_get_initial_rate(mvm, sta, lq_sta, band, rate); rs_init_optimal_rate(mvm, sta, lq_sta); WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B); - if (rate->ant == ANT_A) - tbl->column = RS_COLUMN_LEGACY_ANT_A; - else - tbl->column = RS_COLUMN_LEGACY_ANT_B; + tbl->column = rs_get_column_from_rate(rate); rs_set_expected_tpt_table(lq_sta, tbl); rs_fill_lq_cmd(mvm, sta, lq_sta, rate); -- 2.20.1