mt76: add support for setting mcast rate

Mesh and ad-hoc interfaces allow users to set mcast rate through
NL80211_ATTR_MCAST_RATE, so rework mt76_default_basic_rate() to
adapt that.
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -1352,16 +1352,20 @@ mt76_init_queue(struct mt76_dev *dev, int qid, int idx, int n_desc,
 }
 EXPORT_SYMBOL_GPL(mt76_init_queue);
 
-u16 mt76_default_basic_rate(struct mt76_phy *phy, struct ieee80211_vif *vif)
+u16 mt76_calculate_default_rate(struct mt76_phy *phy, int rateidx)
 {
-	int i = ffs(vif->bss_conf.basic_rates) - 1, offset = 0;
+	int offset = 0;
 	struct ieee80211_rate *rate;
 
 	if (phy->chandef.chan->band == NL80211_BAND_5GHZ)
 		offset = 4;
 
-	rate = &mt76_rates[offset + i];
+	/* pick the lowest rate for hidden nodes */
+	if (rateidx < 0)
+		rateidx = 0;
+
+	rate = &mt76_rates[offset + rateidx];
 
 	return rate->hw_value;
 }
-EXPORT_SYMBOL_GPL(mt76_default_basic_rate);
+EXPORT_SYMBOL_GPL(mt76_calculate_default_rate);

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

@@ -891,7 +891,7 @@ int mt76_get_of_eeprom(struct mt76_dev *dev, void *data, int offset, int len);
 struct mt76_queue *
 mt76_init_queue(struct mt76_dev *dev, int qid, int idx, int n_desc,
 		int ring_base);
-u16 mt76_default_basic_rate(struct mt76_phy *phy, struct ieee80211_vif *vif);
+u16 mt76_calculate_default_rate(struct mt76_phy *phy, int rateidx);
 static inline int mt76_init_tx_queue(struct mt76_phy *phy, int qid, int idx,
 				     int n_desc, int ring_base)
 {

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

@@ -904,17 +904,19 @@ mt7915_mac_write_txwi_8023(struct mt7915_dev *dev, __le32 *txwi,
 
 static void
 mt7915_mac_write_txwi_80211(struct mt7915_dev *dev, __le32 *txwi,
-			    struct sk_buff *skb, struct ieee80211_key_conf *key)
+			    struct sk_buff *skb, struct ieee80211_key_conf *key,
+			    bool *mcast)
 {
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
-	bool multicast = is_multicast_ether_addr(hdr->addr1);
 	u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
 	__le16 fc = hdr->frame_control;
 	u8 fc_type, fc_stype;
 	u32 val;
 
+	*mcast = is_multicast_ether_addr(hdr->addr1);
+
 	if (ieee80211_is_action(fc) &&
 	    mgmt->u.action.category == WLAN_CATEGORY_BACK &&
 	    mgmt->u.action.u.addba_req.action_code == WLAN_ACTION_ADDBA_REQ) {
@@ -940,15 +942,15 @@ mt7915_mac_write_txwi_80211(struct mt7915_dev *dev, __le32 *txwi,
 
 	val = FIELD_PREP(MT_TXD2_FRAME_TYPE, fc_type) |
 	      FIELD_PREP(MT_TXD2_SUB_TYPE, fc_stype) |
-	      FIELD_PREP(MT_TXD2_MULTICAST, multicast);
+	      FIELD_PREP(MT_TXD2_MULTICAST, *mcast);
 
-	if (key && multicast && ieee80211_is_robust_mgmt_frame(skb) &&
+	if (key && *mcast && ieee80211_is_robust_mgmt_frame(skb) &&
 	    key->cipher == WLAN_CIPHER_SUITE_AES_CMAC) {
 		val |= MT_TXD2_BIP;
 		txwi[3] &= ~cpu_to_le32(MT_TXD3_PROTECT_FRAME);
 	}
 
-	if (!ieee80211_is_data(fc) || multicast ||
+	if (!ieee80211_is_data(fc) || *mcast ||
 	    info->flags & IEEE80211_TX_CTL_USE_MINRATE)
 		val |= MT_TXD2_FIX_RATE;
 
@@ -989,6 +991,7 @@ void mt7915_mac_write_txwi(struct mt7915_dev *dev, __le32 *txwi,
 	bool ext_phy = info->hw_queue & MT_TX_HW_QUEUE_EXT_PHY;
 	u8 p_fmt, q_idx, omac_idx = 0, wmm_idx = 0;
 	bool is_8023 = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP;
+	bool mcast = false;
 	u16 tx_count = 15;
 	u32 val;
 
@@ -1051,15 +1054,22 @@ void mt7915_mac_write_txwi(struct mt7915_dev *dev, __le32 *txwi,
 	if (is_8023)
 		mt7915_mac_write_txwi_8023(dev, txwi, skb, wcid);
 	else
-		mt7915_mac_write_txwi_80211(dev, txwi, skb, key);
+		mt7915_mac_write_txwi_80211(dev, txwi, skb, key, &mcast);
 
 	if (txwi[2] & cpu_to_le32(MT_TXD2_FIX_RATE)) {
+		u8 band = mphy->chandef.chan->band;
+		int rateidx, mcast_rate = vif->bss_conf.mcast_rate[band];
 		u16 rate, mode;
 
 		/* hardware won't add HTC for mgmt/ctrl frame */
 		txwi[2] |= cpu_to_le32(MT_TXD2_HTC_VLD);
 
-		rate = mt76_default_basic_rate(mphy, vif);
+		if (mcast && mcast_rate > 0)
+			rateidx = mcast_rate - 1;
+		else
+			rateidx = ffs(vif->bss_conf.basic_rates) - 1;
+
+		rate = mt76_calculate_default_rate(mphy, rateidx);
 		mode = rate >> 8;
 		rate &= GENMASK(7, 0);
 		rate |= FIELD_PREP(MT_TX_RATE_MODE, mode);

drivers/net/wireless/mediatek/mt76/mt7921/mac.c

@@ -812,12 +812,13 @@ void mt7921_mac_write_txwi(struct mt7921_dev *dev, __le32 *txwi,
 		mt7921_mac_write_txwi_80211(dev, txwi, skb, key);
 
 	if (txwi[2] & cpu_to_le32(MT_TXD2_FIX_RATE)) {
+		int rateidx = ffs(vif->bss_conf.basic_rates) - 1;
 		u16 rate, mode;
 
 		/* hardware won't add HTC for mgmt/ctrl frame */
 		txwi[2] |= cpu_to_le32(MT_TXD2_HTC_VLD);
 
-		rate = mt76_default_basic_rate(mphy, vif);
+		rate = mt76_calculate_default_rate(mphy, rateidx);
 		mode = rate >> 8;
 		rate &= GENMASK(7, 0);
 		rate |= FIELD_PREP(MT_TX_RATE_MODE, mode);