wifi: mt76: mt7996: add support for EHT rate report

Currenly only EHT TX rate report is supported. EHT RX rate is temporally
reported with HE rate.
Co-developed-by: MeiChia Chiu <meichia.chiu@mediatek.com>
Signed-off-by: MeiChia Chiu <meichia.chiu@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/debugfs.c

@@ -791,10 +791,10 @@ static ssize_t mt7996_sta_fixed_rate_set(struct file *file,
 	else
 		buf[count] = '\0';
 
-	/* mode - cck: 0, ofdm: 1, ht: 2, gf: 3, vht: 4, he_su: 8, he_er: 9
-	 * bw - bw20: 0, bw40: 1, bw80: 2, bw160: 3
-	 * nss - vht: 1~4, he: 1~4, others: ignore
-	 * mcs - cck: 0~4, ofdm: 0~7, ht: 0~32, vht: 0~9, he_su: 0~11, he_er: 0~2
+	/* mode - cck: 0, ofdm: 1, ht: 2, gf: 3, vht: 4, he_su: 8, he_er: 9 EHT: 15
+	 * bw - bw20: 0, bw40: 1, bw80: 2, bw160: 3, BW320: 4
+	 * nss - vht: 1~4, he: 1~4, eht: 1~4, others: ignore
+	 * mcs - cck: 0~4, ofdm: 0~7, ht: 0~32, vht: 0~9, he_su: 0~11, he_er: 0~2, eht: 0~13
 	 * gi - (ht/vht) lgi: 0, sgi: 1; (he) 0.8us: 0, 1.6us: 1, 3.2us: 2
 	 * preamble - short: 1, long: 0
 	 * ldpc - off: 0, on: 1

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

@@ -189,6 +189,9 @@ static void mt7996_mac_sta_poll(struct mt7996_dev *dev)
 		rate = &msta->wcid.rate;
 
 		switch (rate->bw) {
+		case RATE_INFO_BW_320:
+			bw = IEEE80211_STA_RX_BW_320;
+			break;
 		case RATE_INFO_BW_160:
 			bw = IEEE80211_STA_RX_BW_160;
 			break;
@@ -205,7 +208,11 @@ static void mt7996_mac_sta_poll(struct mt7996_dev *dev)
 
 		addr = mt7996_mac_wtbl_lmac_addr(dev, idx, 6);
 		val = mt76_rr(dev, addr);
-		if (rate->flags & RATE_INFO_FLAGS_HE_MCS) {
+		if (rate->flags & RATE_INFO_FLAGS_EHT_MCS) {
+			addr = mt7996_mac_wtbl_lmac_addr(dev, idx, 5);
+			val = mt76_rr(dev, addr);
+			rate->eht_gi = FIELD_GET(GENMASK(25, 24), val);
+		} else if (rate->flags & RATE_INFO_FLAGS_HE_MCS) {
 			u8 offs = 24 + 2 * bw;
 
 			rate->he_gi = (val & (0x3 << offs)) >> offs;
@@ -560,6 +567,15 @@ mt7996_mac_fill_rx_rate(struct mt7996_dev *dev,
 
 		status->he_dcm = dcm;
 		break;
+	case MT_PHY_TYPE_EHT_SU:
+	case MT_PHY_TYPE_EHT_TRIG:
+	case MT_PHY_TYPE_EHT_MU:
+		/* TODO: currently report rx rate with HE rate */
+		status->nss = nss;
+		status->encoding = RX_ENC_HE;
+		bw = min_t(int, bw, IEEE80211_STA_RX_BW_160);
+		i = min_t(int, i & 0xf, 11);
+		break;
 	default:
 		return -EINVAL;
 	}
@@ -584,6 +600,9 @@ mt7996_mac_fill_rx_rate(struct mt7996_dev *dev,
 	case IEEE80211_STA_RX_BW_160:
 		status->bw = RATE_INFO_BW_160;
 		break;
+	case IEEE80211_STA_RX_BW_320:
+		status->bw = RATE_INFO_BW_320;
+		break;
 	default:
 		return -EINVAL;
 	}
@@ -1378,6 +1397,15 @@ mt7996_mac_add_txs_skb(struct mt7996_dev *dev, struct mt76_wcid *wcid, int pid,
 		rate.he_dcm = FIELD_GET(MT_TX_RATE_DCM, txrate);
 		rate.flags = RATE_INFO_FLAGS_HE_MCS;
 		break;
+	case MT_PHY_TYPE_EHT_SU:
+	case MT_PHY_TYPE_EHT_TRIG:
+	case MT_PHY_TYPE_EHT_MU:
+		if (rate.mcs > 13)
+			goto out;
+
+		rate.eht_gi = wcid->rate.eht_gi;
+		rate.flags = RATE_INFO_FLAGS_EHT_MCS;
+		break;
 	default:
 		goto out;
 	}
@@ -1385,6 +1413,10 @@ mt7996_mac_add_txs_skb(struct mt7996_dev *dev, struct mt76_wcid *wcid, int pid,
 	stats->tx_mode[mode]++;
 
 	switch (FIELD_GET(MT_TXS0_BW, txs)) {
+	case IEEE80211_STA_RX_BW_320:
+		rate.bw = RATE_INFO_BW_320;
+		stats->tx_bw[4]++;
+		break;
 	case IEEE80211_STA_RX_BW_160:
 		rate.bw = RATE_INFO_BW_160;
 		stats->tx_bw[3]++;