mt76: mt7915: add a fixed AC queue mapping

In MT7915, hardware queue map is flexible. However, certain firmware modules
like MU and U-APSD presume a fixed queue order to adapt some devices that have
DMA scheduler with a strict order, so this patch can help in the long run.
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -593,7 +593,7 @@ void mt7915_mac_write_txwi(struct mt7915_dev *dev, __le32 *txwi,
 
 	if (ieee80211_is_data(fc) || ieee80211_is_bufferable_mmpdu(fc)) {
 		q_idx = wmm_idx * MT7915_MAX_WMM_SETS +
-			skb_get_queue_mapping(skb);
+			mt7915_lmac_mapping(dev, skb_get_queue_mapping(skb));
 		p_fmt = MT_TX_TYPE_CT;
 	} else if (beacon) {
 		q_idx = MT_LMAC_BCN0;

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

@@ -149,16 +149,6 @@ enum tx_pkt_type {
 	MT_TX_TYPE_FW,
 };
 
-enum tx_pkt_queue_idx {
-	MT_LMAC_AC00,
-	MT_LMAC_AC01,
-	MT_LMAC_AC02,
-	MT_LMAC_AC03,
-	MT_LMAC_ALTX0 = 0x10,
-	MT_LMAC_BMC0 = 0x10,
-	MT_LMAC_BCN0 = 0x12,
-};
-
 enum tx_port_idx {
 	MT_TX_PORT_IDX_LMAC,
 	MT_TX_PORT_IDX_MCU

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

@@ -350,9 +350,12 @@ static int
 mt7915_conf_tx(struct ieee80211_hw *hw, struct ieee80211_vif *vif, u16 queue,
 	       const struct ieee80211_tx_queue_params *params)
 {
+	struct mt7915_dev *dev = mt7915_hw_dev(hw);
 	struct mt7915_vif *mvif = (struct mt7915_vif *)vif->drv_priv;
 
 	/* no need to update right away, we'll get BSS_CHANGED_QOS */
+	queue = mt7915_lmac_mapping(dev, queue);
+
 	mvif->wmm[queue].cw_min = params->cw_min;
 	mvif->wmm[queue].cw_max = params->cw_max;
 	mvif->wmm[queue].aifs = params->aifs;

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

@@ -199,6 +199,16 @@ enum {
 	EXT_BSSID_END
 };
 
+enum {
+	MT_LMAC_AC00,
+	MT_LMAC_AC01,
+	MT_LMAC_AC02,
+	MT_LMAC_AC03,
+	MT_LMAC_ALTX0 = 0x10,
+	MT_LMAC_BMC0,
+	MT_LMAC_BCN0,
+};
+
 enum {
 	MT_RX_SEL0,
 	MT_RX_SEL1,
@@ -254,6 +264,21 @@ mt7915_ext_phy(struct mt7915_dev *dev)
 	return phy->priv;
 }
 
+static inline u8 mt7915_lmac_mapping(struct mt7915_dev *dev, u8 ac)
+{
+	static const u8 lmac_queue_map[] = {
+		[IEEE80211_AC_BK] = MT_LMAC_AC00,
+		[IEEE80211_AC_BE] = MT_LMAC_AC01,
+		[IEEE80211_AC_VI] = MT_LMAC_AC02,
+		[IEEE80211_AC_VO] = MT_LMAC_AC03,
+	};
+
+	if (WARN_ON_ONCE(ac >= ARRAY_SIZE(lmac_queue_map)))
+		return MT_LMAC_AC01; /* BE */
+
+	return lmac_queue_map[ac];
+}
+
 static inline void
 mt7915_set_aggr_state(struct mt7915_sta *msta, u8 tid,
 		      enum mt7915_ampdu_state state)