mt76: mt7915: add spatial reuse support

Enable or disable OBSS PD when the bss config changes or we
assoc to an AP that broadcasts the IE.

With this patch, we can get ~20% gain in OBSS OTA environment.

Tested-by: Evelyn Tsai <evelyn.tsai@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/main.c

@@ -437,8 +437,10 @@ static void mt7915_bss_info_changed(struct ieee80211_hw *hw,
 		mt7915_mcu_add_sta(dev, vif, NULL, join);
 	}
 
-	if (changed & BSS_CHANGED_ASSOC)
+	if (changed & BSS_CHANGED_ASSOC) {
 		mt7915_mcu_add_bss_info(phy, vif, info->assoc);
+		mt7915_mcu_add_obss_spr(dev, vif, info->he_obss_pd.enable);
+	}
 
 	if (changed & BSS_CHANGED_ERP_SLOT) {
 		int slottime = info->use_short_slot ? 9 : 20;
@@ -458,6 +460,9 @@ static void mt7915_bss_info_changed(struct ieee80211_hw *hw,
 	if (changed & (BSS_CHANGED_QOS | BSS_CHANGED_BEACON_ENABLED))
 		mt7915_mcu_set_tx(dev, vif);
 
+	if (changed & BSS_CHANGED_HE_OBSS_PD)
+		mt7915_mcu_add_obss_spr(dev, vif, info->he_obss_pd.enable);
+
 	if (changed & (BSS_CHANGED_BEACON |
 		       BSS_CHANGED_BEACON_ENABLED))
 		mt7915_mcu_add_beacon(hw, vif, info->enable_beacon);

drivers/net/wireless/mediatek/mt76/mt7915/mcu.c

@@ -3159,3 +3159,28 @@ int mt7915_mcu_set_txbf_sounding(struct mt7915_dev *dev)
 	return __mt76_mcu_send_msg(&dev->mt76, MCU_EXT_CMD_TXBF_ACTION,
 				   &req, sizeof(req), true);
 }
+
+int mt7915_mcu_add_obss_spr(struct mt7915_dev *dev, struct ieee80211_vif *vif,
+			    bool enable)
+{
+#define MT_SPR_ENABLE		1
+	struct mt7915_vif *mvif = (struct mt7915_vif *)vif->drv_priv;
+	struct {
+		u8 action;
+		u8 arg_num;
+		u8 band_idx;
+		u8 status;
+		u8 drop_tx_idx;
+		u8 sta_idx;	/* 256 sta */
+		u8 rsv[2];
+		u32 val;
+	} __packed req = {
+		.action = MT_SPR_ENABLE,
+		.arg_num = 1,
+		.band_idx = mvif->band_idx,
+		.val = enable,
+	};
+
+	return __mt76_mcu_send_msg(&dev->mt76, MCU_EXT_CMD_SET_SPR,
+				   &req, sizeof(req), true);
+}

drivers/net/wireless/mediatek/mt76/mt7915/mcu.h

@@ -212,6 +212,7 @@ enum {
 	MCU_EXT_CMD_RATE_CTRL = 0x87,
 	MCU_EXT_CMD_FW_DBG_CTRL = 0x95,
 	MCU_EXT_CMD_SET_RDD_TH = 0x9d,
+	MCU_EXT_CMD_SET_SPR = 0xa8,
 };
 
 enum {

drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h

@@ -301,6 +301,8 @@ int mt7915_mcu_add_key(struct mt7915_dev *dev, struct ieee80211_vif *vif,
 		       enum set_key_cmd cmd);
 int mt7915_mcu_add_beacon(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 			  int enable);
+int mt7915_mcu_add_obss_spr(struct mt7915_dev *dev, struct ieee80211_vif *vif,
+                            bool enable);
 int mt7915_mcu_add_rate_ctrl(struct mt7915_dev *dev, struct ieee80211_vif *vif,
 			     struct ieee80211_sta *sta);
 int mt7915_mcu_add_smps(struct mt7915_dev *dev, struct ieee80211_vif *vif,