iwlagn: set traffic load based on multiple factors

Current BT traffic load should based on the following conditions:

1. BT On/Off status
2. Channel announcement enable/disable
3. Curren traffic load report from uCode

Need to modify rate scale to down-grade from MIMO to SISO if detected
high BT traffic load. Also need to make sure not using chain "B" with high
BT traffic or if it is in "full concurrency" mode.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 71 insertions, 42 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
index 687b534d83d0..e78f3f0592d6 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
@@ -82,7 +82,7 @@ static void rs_rate_scale_perform(struct iwl_priv *priv,
 				   struct iwl_lq_sta *lq_sta);
 static void rs_fill_link_cmd(struct iwl_priv *priv,
 			     struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
-static void rs_stay_in_table(struct iwl_lq_sta *lq_sta);
+static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 
 
 #ifdef CONFIG_MAC80211_DEBUGFS
@@ -900,7 +900,7 @@ static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 		 * no matching table found, let's by-pass the data collection
 		 * and continue to perform rate scale to find the rate table
 		 */
-		rs_stay_in_table(lq_sta);
+		rs_stay_in_table(lq_sta, true);
 		goto done;
 	}
 
@@ -1334,15 +1334,17 @@ static int rs_move_legacy_other(struct iwl_priv *priv,
 		break;
 	case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
 		/* avoid antenna B unless MIMO */
+		valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
 		if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
 			tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
 		break;
 	case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
 	case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
 		/* avoid antenna B and MIMO */
+		valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
 		if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
 		    tbl->action != IWL_LEGACY_SWITCH_SISO)
-			tbl->action = IWL_SISO_SWITCH_ANTENNA1;
+			tbl->action = IWL_LEGACY_SWITCH_SISO;
 		break;
 	default:
 		IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
@@ -1362,6 +1364,7 @@ static int rs_move_legacy_other(struct iwl_priv *priv,
 			tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
 		else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
 			tbl->action = IWL_LEGACY_SWITCH_SISO;
+		valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
 	}
 
 	start_action = tbl->action;
@@ -1379,7 +1382,10 @@ static int rs_move_legacy_other(struct iwl_priv *priv,
 				break;
 
 			/* Don't change antenna if success has been great */
-			if (window->success_ratio >= IWL_RS_GOOD_RATIO)
+			if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
+			    !priv->bt_full_concurrent &&
+			    priv->bt_traffic_load ==
+					IWL_BT_COEX_TRAFFIC_LOAD_NONE)
 				break;
 
 			/* Set up search table to try other antenna */
@@ -1503,14 +1509,15 @@ static int rs_move_siso_to_other(struct iwl_priv *priv,
 		break;
 	case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
 		/* avoid antenna B unless MIMO */
+		valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
 		if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
 			tbl->action = IWL_SISO_SWITCH_ANTENNA1;
 		break;
 	case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
 	case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
 		/* avoid antenna B and MIMO */
-		if (tbl->action >= IWL_SISO_SWITCH_ANTENNA2 &&
-		    tbl->action != IWL_SISO_SWITCH_GI)
+		valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
+		if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
 			tbl->action = IWL_SISO_SWITCH_ANTENNA1;
 		break;
 	default:
@@ -1525,9 +1532,11 @@ static int rs_move_siso_to_other(struct iwl_priv *priv,
 	}
 
 	/* configure as 1x1 if bt full concurrency */
-	if (priv->bt_full_concurrent &&
-	    tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
-		tbl->action = IWL_SISO_SWITCH_ANTENNA1;
+	if (priv->bt_full_concurrent) {
+		valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
+		if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
+			tbl->action = IWL_SISO_SWITCH_ANTENNA1;
+	}
 
 	start_action = tbl->action;
 	for (;;) {
@@ -1536,14 +1545,16 @@ static int rs_move_siso_to_other(struct iwl_priv *priv,
 		case IWL_SISO_SWITCH_ANTENNA1:
 		case IWL_SISO_SWITCH_ANTENNA2:
 			IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
-
 			if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
-							tx_chains_num <= 1) ||
+						tx_chains_num <= 1) ||
 			    (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
-							tx_chains_num <= 2))
+						tx_chains_num <= 2))
 				break;
 
-			if (window->success_ratio >= IWL_RS_GOOD_RATIO)
+			if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
+			    !priv->bt_full_concurrent &&
+			    priv->bt_traffic_load ==
+					IWL_BT_COEX_TRAFFIC_LOAD_NONE)
 				break;
 
 			memcpy(search_tbl, tbl, sz);
@@ -1670,13 +1681,13 @@ static int rs_move_mimo2_to_other(struct iwl_priv *priv,
 	case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
 	case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
 		/* avoid antenna B and MIMO */
-		if (tbl->action == IWL_MIMO2_SWITCH_MIMO3_ABC)
-			tbl->action = IWL_SISO_SWITCH_ANTENNA1;
+		if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
+			tbl->action = IWL_MIMO2_SWITCH_SISO_A;
+		break;
 	case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
 		/* avoid antenna B unless MIMO */
-		if (tbl->action == IWL_MIMO2_SWITCH_ANTENNA2)
-			tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
-		else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
+		if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
+		    tbl->action == IWL_MIMO2_SWITCH_SISO_C)
 			tbl->action = IWL_MIMO2_SWITCH_SISO_A;
 		break;
 	default:
@@ -1840,16 +1851,14 @@ static int rs_move_mimo3_to_other(struct iwl_priv *priv,
 	case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
 	case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
 		/* avoid antenna B and MIMO */
-		if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB ||
-		    tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC ||
-		    tbl->action == IWL_MIMO3_SWITCH_MIMO2_BC)
+		if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
 			tbl->action = IWL_MIMO3_SWITCH_SISO_A;
+		break;
 	case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
 		/* avoid antenna B unless MIMO */
-		if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
+		if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
+		    tbl->action == IWL_MIMO3_SWITCH_SISO_C)
 			tbl->action = IWL_MIMO3_SWITCH_SISO_A;
-		else if (tbl->action == IWL_MIMO3_SWITCH_ANTENNA2)
-			tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
 		break;
 	default:
 		IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
@@ -1996,7 +2005,7 @@ static int rs_move_mimo3_to_other(struct iwl_priv *priv,
  * 2) # times calling this function
  * 3) elapsed time in this mode (not used, for now)
  */
-static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
+static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
 {
 	struct iwl_scale_tbl_info *tbl;
 	int i;
@@ -2027,7 +2036,8 @@ static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
 		 * allow a new search.  Also (below) reset all bitmaps and
 		 * stats in active history.
 		 */
-		if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
+		if (force_search ||
+		    (lq_sta->total_failed > lq_sta->max_failure_limit) ||
 		    (lq_sta->total_success > lq_sta->max_success_limit) ||
 		    ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
 		     && (flush_interval_passed))) {
@@ -2243,7 +2253,7 @@ static void rs_rate_scale_perform(struct iwl_priv *priv,
 
 		/* Should we stay with this modulation mode,
 		 * or search for a new one? */
-		rs_stay_in_table(lq_sta);
+		rs_stay_in_table(lq_sta, false);
 
 		goto out;
 	}
@@ -2392,16 +2402,25 @@ static void rs_rate_scale_perform(struct iwl_priv *priv,
 		(is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
 		scale_action = -1;
 
-	if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
-		lq_sta->last_bt_traffic = priv->bt_traffic_load;
-		/*
-		 * don't set scale_action, don't want to scale up if
-		 * the rate scale doesn't otherwise think that is a
-		 * good idea.
-		 */
-	} else if (lq_sta->last_bt_traffic < priv->bt_traffic_load) {
-		lq_sta->last_bt_traffic = priv->bt_traffic_load;
-		scale_action = -1;
+	if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
+	     (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
+		if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
+			/*
+			 * don't set scale_action, don't want to scale up if
+			 * the rate scale doesn't otherwise think that is a
+			 * good idea.
+			 */
+		} else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
+			scale_action = -1;
+		}
+	}
+	lq_sta->last_bt_traffic = priv->bt_traffic_load;
+
+	if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
+	     (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
+		/* search for a new modulation */
+		rs_stay_in_table(lq_sta, true);
+		goto lq_update;
 	}
 
 	switch (scale_action) {
@@ -2440,7 +2459,7 @@ lq_update:
 	if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
 		/* Should we stay with this modulation mode,
 		 * or search for a new one? */
-		rs_stay_in_table(lq_sta);
+	  rs_stay_in_table(lq_sta, false);
 	}
 	/*
 	 * Search for new modulation mode if we're:
@@ -2786,6 +2805,12 @@ static void rs_fill_link_cmd(struct iwl_priv *priv,
 	rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
 				  &tbl_type, &rate_idx);
 
+	if (priv && priv->bt_full_concurrent) {
+		/* 1x1 only */
+		tbl_type.ant_type =
+			first_antenna(priv->hw_params.valid_tx_ant);
+	}
+
 	/* How many times should we repeat the initial rate? */
 	if (is_legacy(tbl_type.lq_type)) {
 		ant_toggle_cnt = 1;
@@ -2800,8 +2825,7 @@ static void rs_fill_link_cmd(struct iwl_priv *priv,
 	/* Fill 1st table entry (index 0) */
 	lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
 
-	if (num_of_ant(tbl_type.ant_type) == 1 ||
-	    (priv && priv->bt_full_concurrent)) {
+	if (num_of_ant(tbl_type.ant_type) == 1) {
 		lq_cmd->general_params.single_stream_ant_msk =
 						tbl_type.ant_type;
 	} else if (num_of_ant(tbl_type.ant_type) == 2) {
@@ -2811,7 +2835,6 @@ static void rs_fill_link_cmd(struct iwl_priv *priv,
 
 	index++;
 	repeat_rate--;
-
 	if (priv) {
 		if (priv->bt_full_concurrent)
 			valid_tx_ant = ANT_A;
@@ -2832,7 +2855,7 @@ static void rs_fill_link_cmd(struct iwl_priv *priv,
 					 rs_toggle_antenna(valid_tx_ant,
 							&new_rate, &tbl_type))
 					ant_toggle_cnt = 1;
-}
+			}
 
 			/* Override next rate if needed for debug purposes */
 			rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
@@ -2847,6 +2870,12 @@ static void rs_fill_link_cmd(struct iwl_priv *priv,
 		rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
 						&rate_idx);
 
+		if (priv && priv->bt_full_concurrent) {
+			/* 1x1 only */
+			tbl_type.ant_type =
+				first_antenna(priv->hw_params.valid_tx_ant);
+		}
+
 		/* Indicate to uCode which entries might be MIMO.
 		 * If initial rate was MIMO, this will finally end up
 		 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */