mt76: add U-APSD support on AP side

Introduce U-APSD support in mt76 driver for AP interface
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mac80211.c

@@ -282,7 +282,8 @@ mt76_phy_init(struct mt76_dev *dev, struct ieee80211_hw *hw)
 
 	wiphy->features |= NL80211_FEATURE_ACTIVE_MONITOR;
 	wiphy->flags |= WIPHY_FLAG_HAS_CHANNEL_SWITCH |
-			WIPHY_FLAG_SUPPORTS_TDLS;
+			WIPHY_FLAG_SUPPORTS_TDLS |
+			WIPHY_FLAG_AP_UAPSD;
 
 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_CQM_RSSI_LIST);
 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_AIRTIME_FAIRNESS);
@@ -292,6 +293,7 @@ mt76_phy_init(struct mt76_dev *dev, struct ieee80211_hw *hw)
 	wiphy->available_antennas_rx = dev->phy.antenna_mask;
 
 	hw->txq_data_size = sizeof(struct mt76_txq);
+	hw->uapsd_max_sp_len = IEEE80211_WMM_IE_STA_QOSINFO_SP_ALL;
 
 	if (!hw->max_tx_fragments)
 		hw->max_tx_fragments = 16;

drivers/net/wireless/mediatek/mt76/mt7615/mcu.c

@@ -926,6 +926,38 @@ mt7615_mcu_sta_ht_tlv(struct sk_buff *skb, struct ieee80211_sta *sta)
 	}
 }
 
+static void
+mt7615_mcu_sta_uapsd(struct sk_buff *skb, struct ieee80211_vif *vif,
+		     struct ieee80211_sta *sta)
+{
+	struct sta_rec_uapsd *uapsd;
+	struct tlv *tlv;
+
+	if (vif->type != NL80211_IFTYPE_AP || !sta->wme)
+		return;
+
+	tlv = mt7615_mcu_add_tlv(skb, STA_REC_APPS, sizeof(*uapsd));
+	uapsd = (struct sta_rec_uapsd *)tlv;
+
+	if (sta->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) {
+		uapsd->dac_map |= BIT(3);
+		uapsd->tac_map |= BIT(3);
+	}
+	if (sta->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) {
+		uapsd->dac_map |= BIT(2);
+		uapsd->tac_map |= BIT(2);
+	}
+	if (sta->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) {
+		uapsd->dac_map |= BIT(1);
+		uapsd->tac_map |= BIT(1);
+	}
+	if (sta->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) {
+		uapsd->dac_map |= BIT(0);
+		uapsd->tac_map |= BIT(0);
+	}
+	uapsd->max_sp = sta->max_sp;
+}
+
 static void
 mt7615_mcu_wtbl_ba_tlv(struct sk_buff *skb,
 		       struct ieee80211_ampdu_params *params,
@@ -1188,8 +1220,10 @@ mt7615_mcu_wtbl_sta_add(struct mt7615_dev *dev, struct ieee80211_vif *vif,
 		return PTR_ERR(sskb);
 
 	mt7615_mcu_sta_basic_tlv(sskb, vif, sta, enable);
-	if (enable && sta)
+	if (enable && sta) {
 		mt7615_mcu_sta_ht_tlv(sskb, sta);
+		mt7615_mcu_sta_uapsd(sskb, vif, sta);
+	}
 
 	wtbl_hdr = mt7615_mcu_alloc_wtbl_req(dev, msta, WTBL_RESET_AND_SET,
 					     NULL, &wskb);
@@ -1285,8 +1319,10 @@ mt7615_mcu_add_sta_cmd(struct mt7615_dev *dev, struct ieee80211_vif *vif,
 		return PTR_ERR(skb);
 
 	mt7615_mcu_sta_basic_tlv(skb, vif, sta, enable);
-	if (enable && sta)
+	if (enable && sta) {
 		mt7615_mcu_sta_ht_tlv(skb, sta);
+		mt7615_mcu_sta_uapsd(skb, vif, sta);
+	}
 
 	sta_wtbl = mt7615_mcu_add_tlv(skb, STA_REC_WTBL, sizeof(struct tlv));
 
@@ -1429,6 +1465,7 @@ mt7615_mcu_uni_add_bss(struct mt7615_phy *phy, struct ieee80211_vif *vif,
 			u8 pad[3];
 		} __packed hdr;
 		struct mt7615_bss_basic_tlv basic;
+		struct mt7615_bss_qos_tlv qos;
 	} basic_req = {
 		.hdr = {
 			.bss_idx = mvif->idx,
@@ -1444,6 +1481,11 @@ mt7615_mcu_uni_add_bss(struct mt7615_phy *phy, struct ieee80211_vif *vif,
 			.active = true, /* keep bss deactivated */
 			.phymode = 0x38,
 		},
+		.qos = {
+			.tag = cpu_to_le16(UNI_BSS_INFO_QBSS),
+			.len = cpu_to_le16(sizeof(struct mt7615_bss_qos_tlv)),
+			.qos = vif->bss_conf.qos,
+		},
 	};
 	struct {
 		struct {

drivers/net/wireless/mediatek/mt76/mt7615/mcu.h

@@ -454,6 +454,13 @@ struct mt7615_bss_basic_tlv {
 	u8 pad[3];
 } __packed;
 
+struct mt7615_bss_qos_tlv {
+	__le16 tag;
+	__le16 len;
+	u8 qos;
+	u8 pad[3];
+} __packed;
+
 struct mt7615_wow_ctrl_tlv {
 	__le16 tag;
 	__le16 len;
@@ -578,6 +585,8 @@ enum {
 	UNI_BSS_INFO_BASIC = 0,
 	UNI_BSS_INFO_RLM = 2,
 	UNI_BSS_INFO_BCN_CONTENT = 7,
+	UNI_BSS_INFO_QBSS = 15,
+	UNI_BSS_INFO_UAPSD = 19,
 };
 
 enum {
@@ -891,6 +900,7 @@ struct wtbl_raw {
 					 sizeof(struct sta_rec_basic) +	\
 					 sizeof(struct sta_rec_ht) +	\
 					 sizeof(struct sta_rec_vht) +	\
+					 sizeof(struct sta_rec_uapsd) + \
 					 sizeof(struct tlv) +	\
 					 MT7615_WTBL_UPDATE_MAX_SIZE)
 
@@ -980,6 +990,17 @@ struct sta_rec_ba {
 	__le16 winsize;
 } __packed;
 
+struct sta_rec_uapsd {
+	__le16 tag;
+	__le16 len;
+	u8 dac_map;
+	u8 tac_map;
+	u8 max_sp;
+	u8 rsv0;
+	__le16 listen_interval;
+	u8 rsv1[2];
+} __packed;
+
 enum {
 	STA_REC_BASIC,
 	STA_REC_RA,