wifi: mt76: mt7996: support more options for mt7996_set_bitrate_mask()

Add support to configure parameters at runtime, such as mcs, gi, and
he_ltf. Note that EHT mode does not support this feature yet.
Co-developed-by: MeiChia Chiu <MeiChia.Chiu@mediatek.com>
Signed-off-by: MeiChia Chiu <MeiChia.Chiu@mediatek.com>
Signed-off-by: Howard Hsu <howard-yh.hsu@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7996/mcu.c

@@ -1624,6 +1624,132 @@ int mt7996_mcu_set_fixed_rate_ctrl(struct mt7996_dev *dev,
 				     MCU_WM_UNI_CMD(RA), true);
 }
 
+static int
+mt7996_mcu_set_fixed_field(struct mt7996_dev *dev, struct ieee80211_vif *vif,
+			   struct ieee80211_sta *sta, void *data, u32 field)
+{
+	struct mt7996_vif *mvif = (struct mt7996_vif *)vif->drv_priv;
+	struct mt7996_sta *msta = (struct mt7996_sta *)sta->drv_priv;
+	struct sta_phy *phy = data;
+	struct sta_rec_ra_fixed *ra;
+	struct sk_buff *skb;
+	struct tlv *tlv;
+
+	skb = __mt76_connac_mcu_alloc_sta_req(&dev->mt76, &mvif->mt76,
+					      &msta->wcid,
+					      MT7996_STA_UPDATE_MAX_SIZE);
+	if (IS_ERR(skb))
+		return PTR_ERR(skb);
+
+	tlv = mt76_connac_mcu_add_tlv(skb, STA_REC_RA_UPDATE, sizeof(*ra));
+	ra = (struct sta_rec_ra_fixed *)tlv;
+
+	switch (field) {
+	case RATE_PARAM_AUTO:
+		break;
+	case RATE_PARAM_FIXED:
+	case RATE_PARAM_FIXED_MCS:
+	case RATE_PARAM_FIXED_GI:
+	case RATE_PARAM_FIXED_HE_LTF:
+		if (phy)
+			ra->phy = *phy;
+		break;
+	default:
+		break;
+	}
+	ra->field = cpu_to_le32(field);
+
+	return mt76_mcu_skb_send_msg(&dev->mt76, skb,
+				     MCU_WMWA_UNI_CMD(STA_REC_UPDATE), true);
+}
+
+static int
+mt7996_mcu_add_rate_ctrl_fixed(struct mt7996_dev *dev, struct ieee80211_vif *vif,
+			       struct ieee80211_sta *sta)
+{
+	struct mt7996_vif *mvif = (struct mt7996_vif *)vif->drv_priv;
+	struct cfg80211_chan_def *chandef = &mvif->phy->mt76->chandef;
+	struct cfg80211_bitrate_mask *mask = &mvif->bitrate_mask;
+	enum nl80211_band band = chandef->chan->band;
+	struct sta_phy phy = {};
+	int ret, nrates = 0;
+
+#define __sta_phy_bitrate_mask_check(_mcs, _gi, _ht, _he)			\
+	do {									\
+		u8 i, gi = mask->control[band]._gi;				\
+		gi = (_he) ? gi : gi == NL80211_TXRATE_FORCE_SGI;		\
+		phy.sgi = gi;							\
+		phy.he_ltf = mask->control[band].he_ltf;			\
+		for (i = 0; i < ARRAY_SIZE(mask->control[band]._mcs); i++) {	\
+			if (!mask->control[band]._mcs[i])			\
+				continue;					\
+			nrates += hweight16(mask->control[band]._mcs[i]);	\
+			phy.mcs = ffs(mask->control[band]._mcs[i]) - 1;		\
+			if (_ht)						\
+				phy.mcs += 8 * i;				\
+		}								\
+	} while (0)
+
+	if (sta->deflink.he_cap.has_he) {
+		__sta_phy_bitrate_mask_check(he_mcs, he_gi, 0, 1);
+	} else if (sta->deflink.vht_cap.vht_supported) {
+		__sta_phy_bitrate_mask_check(vht_mcs, gi, 0, 0);
+	} else if (sta->deflink.ht_cap.ht_supported) {
+		__sta_phy_bitrate_mask_check(ht_mcs, gi, 1, 0);
+	} else {
+		nrates = hweight32(mask->control[band].legacy);
+		phy.mcs = ffs(mask->control[band].legacy) - 1;
+	}
+#undef __sta_phy_bitrate_mask_check
+
+	/* fall back to auto rate control */
+	if (mask->control[band].gi == NL80211_TXRATE_DEFAULT_GI &&
+	    mask->control[band].he_gi == GENMASK(7, 0) &&
+	    mask->control[band].he_ltf == GENMASK(7, 0) &&
+	    nrates != 1)
+		return 0;
+
+	/* fixed single rate */
+	if (nrates == 1) {
+		ret = mt7996_mcu_set_fixed_field(dev, vif, sta, &phy,
+						 RATE_PARAM_FIXED_MCS);
+		if (ret)
+			return ret;
+	}
+
+	/* fixed GI */
+	if (mask->control[band].gi != NL80211_TXRATE_DEFAULT_GI ||
+	    mask->control[band].he_gi != GENMASK(7, 0)) {
+		struct mt7996_sta *msta = (struct mt7996_sta *)sta->drv_priv;
+		u32 addr;
+
+		/* firmware updates only TXCMD but doesn't take WTBL into
+		 * account, so driver should update here to reflect the
+		 * actual txrate hardware sends out.
+		 */
+		addr = mt7996_mac_wtbl_lmac_addr(dev, msta->wcid.idx, 7);
+		if (sta->deflink.he_cap.has_he)
+			mt76_rmw_field(dev, addr, GENMASK(31, 24), phy.sgi);
+		else
+			mt76_rmw_field(dev, addr, GENMASK(15, 12), phy.sgi);
+
+		ret = mt7996_mcu_set_fixed_field(dev, vif, sta, &phy,
+						 RATE_PARAM_FIXED_GI);
+		if (ret)
+			return ret;
+	}
+
+	/* fixed HE_LTF */
+	if (mask->control[band].he_ltf != GENMASK(7, 0)) {
+		ret = mt7996_mcu_set_fixed_field(dev, vif, sta, &phy,
+						 RATE_PARAM_FIXED_HE_LTF);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 static void
 mt7996_mcu_sta_rate_ctrl_tlv(struct sk_buff *skb, struct mt7996_dev *dev,
 			     struct ieee80211_vif *vif, struct ieee80211_sta *sta)
@@ -1733,6 +1859,7 @@ int mt7996_mcu_add_rate_ctrl(struct mt7996_dev *dev, struct ieee80211_vif *vif,
 	struct mt7996_vif *mvif = (struct mt7996_vif *)vif->drv_priv;
 	struct mt7996_sta *msta = (struct mt7996_sta *)sta->drv_priv;
 	struct sk_buff *skb;
+	int ret;
 
 	skb = __mt76_connac_mcu_alloc_sta_req(&dev->mt76, &mvif->mt76,
 					      &msta->wcid,
@@ -1752,8 +1879,12 @@ int mt7996_mcu_add_rate_ctrl(struct mt7996_dev *dev, struct ieee80211_vif *vif,
 	 */
 	mt7996_mcu_sta_rate_ctrl_tlv(skb, dev, vif, sta);
 
-	return mt76_mcu_skb_send_msg(&dev->mt76, skb,
-				     MCU_WMWA_UNI_CMD(STA_REC_UPDATE), true);
+	ret = mt76_mcu_skb_send_msg(&dev->mt76, skb,
+				    MCU_WMWA_UNI_CMD(STA_REC_UPDATE), true);
+	if (ret)
+		return ret;
+
+	return mt7996_mcu_add_rate_ctrl_fixed(dev, vif, sta);
 }
 
 static int