diff options
Diffstat (limited to 'drivers/net/wireless/iwlwifi/mvm/rs.c')
-rw-r--r-- | drivers/net/wireless/iwlwifi/mvm/rs.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/mvm/rs.c b/drivers/net/wireless/iwlwifi/mvm/rs.c index 435e1e4..34d98b2 100644 --- a/drivers/net/wireless/iwlwifi/mvm/rs.c +++ b/drivers/net/wireless/iwlwifi/mvm/rs.c @@ -1664,6 +1664,51 @@ static void rs_update_rate_tbl(struct iwl_mvm *mvm, iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); } +static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, + struct ieee80211_sta *sta, + struct iwl_lq_sta *lq_sta, + struct iwl_scale_tbl_info *tbl, + enum rs_action scale_action) +{ + if (sta->bandwidth != IEEE80211_STA_RX_BW_80) + return false; + + if (!is_vht_siso(&tbl->rate)) + return false; + + if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && + (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && + (scale_action == RS_ACTION_DOWNSCALE)) { + tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; + tbl->rate.index = IWL_RATE_MCS_4_INDEX; + IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); + goto tweaked; + } + + /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is + * sustainable, i.e. we're past the test window. We can't go back + * if MCS5 is just tested as this will happen always after switching + * to 20Mhz MCS4 because the rate stats are cleared. + */ + if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && + (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && + (scale_action == RS_ACTION_STAY)) || + ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && + (scale_action == RS_ACTION_UPSCALE)))) { + tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; + tbl->rate.index = IWL_RATE_MCS_1_INDEX; + IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); + goto tweaked; + } + + return false; + +tweaked: + rs_set_expected_tpt_table(lq_sta, tbl); + rs_rate_scale_clear_tbl_windows(mvm, tbl); + return true; +} + static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, struct iwl_lq_sta *lq_sta, struct ieee80211_sta *sta, @@ -2347,6 +2392,8 @@ lq_update: /* Replace uCode's rate table for the destination station. */ if (update_lq) { tbl->rate.index = index; + if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) + rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); rs_update_rate_tbl(mvm, sta, lq_sta, tbl); } |