wifi: mt76: mt7925: add EHT radiotap support in monitor mode

Add IEEE80211_RADIOTAP_EHT and IEEE80211_RADIOTAP_EHT_USIG radiotap
to fill in EHT information, such as MCS, NSS, GI and bandwidth.
Co-developed-by: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>
Signed-off-by: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt76_connac.h

@@ -451,4 +451,6 @@ void mt76_connac2_tx_token_put(struct mt76_dev *dev);
 /* connac3 */
 void mt76_connac3_mac_decode_he_radiotap(struct sk_buff *skb, __le32 *rxv,
 					 u8 mode);
+void mt76_connac3_mac_decode_eht_radiotap(struct sk_buff *skb, __le32 *rxv,
+					  u8 mode);
 #endif /* __MT76_CONNAC_H */

drivers/net/wireless/mediatek/mt76/mt76_connac3_mac.c

@@ -6,8 +6,11 @@
 #include "dma.h"
 
 #define HE_BITS(f)		cpu_to_le16(IEEE80211_RADIOTAP_HE_##f)
+#define EHT_BITS(f)		cpu_to_le32(IEEE80211_RADIOTAP_EHT_##f)
 #define HE_PREP(f, m, v)	le16_encode_bits(le32_get_bits(v, MT_CRXV_HE_##m),\
 						 IEEE80211_RADIOTAP_HE_##f)
+#define EHT_PREP(f, m, v)	le32_encode_bits(le32_get_bits(v, MT_CRXV_EHT_##m),\
+						 IEEE80211_RADIOTAP_EHT_##f)
 
 static void
 mt76_connac3_mac_decode_he_radiotap_ru(struct mt76_rx_status *status,
@@ -180,3 +183,85 @@ void mt76_connac3_mac_decode_he_radiotap(struct sk_buff *skb, __le32 *rxv,
 	}
 }
 EXPORT_SYMBOL_GPL(mt76_connac3_mac_decode_he_radiotap);
+
+static void *
+mt76_connac3_mac_radiotap_push_tlv(struct sk_buff *skb, u16 type, u16 len)
+{
+	struct ieee80211_radiotap_tlv *tlv;
+
+	tlv = skb_push(skb, sizeof(*tlv) + len);
+	tlv->type = cpu_to_le16(type);
+	tlv->len = cpu_to_le16(len);
+	memset(tlv->data, 0, len);
+
+	return tlv->data;
+}
+
+void mt76_connac3_mac_decode_eht_radiotap(struct sk_buff *skb, __le32 *rxv,
+					  u8 mode)
+{
+	struct mt76_rx_status *status = (struct mt76_rx_status *)skb->cb;
+	struct ieee80211_radiotap_eht_usig *usig;
+	struct ieee80211_radiotap_eht *eht;
+	u32 ltf_size = le32_get_bits(rxv[4], MT_CRXV_HE_LTF_SIZE) + 1;
+	u8 bw = FIELD_GET(MT_PRXV_FRAME_MODE, le32_to_cpu(rxv[2]));
+
+	if (WARN_ONCE(skb_mac_header(skb) != skb->data,
+		      "Should push tlv at the top of mac hdr"))
+		return;
+
+	eht = mt76_connac3_mac_radiotap_push_tlv(skb, IEEE80211_RADIOTAP_EHT,
+						 sizeof(*eht) + sizeof(u32));
+	usig = mt76_connac3_mac_radiotap_push_tlv(skb, IEEE80211_RADIOTAP_EHT_USIG,
+						  sizeof(*usig));
+
+	status->flag |= RX_FLAG_RADIOTAP_TLV_AT_END;
+
+	eht->known |= EHT_BITS(KNOWN_SPATIAL_REUSE) |
+		      EHT_BITS(KNOWN_GI) |
+		      EHT_BITS(KNOWN_EHT_LTF) |
+		      EHT_BITS(KNOWN_LDPC_EXTRA_SYM_OM) |
+		      EHT_BITS(KNOWN_PE_DISAMBIGUITY_OM) |
+		      EHT_BITS(KNOWN_NSS_S);
+
+	eht->data[0] |=
+		EHT_PREP(DATA0_SPATIAL_REUSE, SR_MASK, rxv[13]) |
+		cpu_to_le32(FIELD_PREP(IEEE80211_RADIOTAP_EHT_DATA0_GI, status->eht.gi) |
+			    FIELD_PREP(IEEE80211_RADIOTAP_EHT_DATA0_LTF, ltf_size)) |
+		EHT_PREP(DATA0_PE_DISAMBIGUITY_OM, PE_DISAMBIG, rxv[5]) |
+		EHT_PREP(DATA0_LDPC_EXTRA_SYM_OM, LDPC_EXT_SYM, rxv[4]);
+
+	eht->data[7] |= le32_encode_bits(status->nss, IEEE80211_RADIOTAP_EHT_DATA7_NSS_S);
+
+	eht->user_info[0] |=
+		EHT_BITS(USER_INFO_MCS_KNOWN) |
+		EHT_BITS(USER_INFO_CODING_KNOWN) |
+		EHT_BITS(USER_INFO_NSS_KNOWN_O) |
+		EHT_BITS(USER_INFO_BEAMFORMING_KNOWN_O) |
+		EHT_BITS(USER_INFO_DATA_FOR_USER) |
+		le32_encode_bits(status->rate_idx, IEEE80211_RADIOTAP_EHT_USER_INFO_MCS) |
+		le32_encode_bits(status->nss, IEEE80211_RADIOTAP_EHT_USER_INFO_NSS_O);
+
+	if (le32_to_cpu(rxv[0]) & MT_PRXV_TXBF)
+		eht->user_info[0] |= EHT_BITS(USER_INFO_BEAMFORMING_O);
+
+	if (le32_to_cpu(rxv[0]) & MT_PRXV_HT_AD_CODE)
+		eht->user_info[0] |= EHT_BITS(USER_INFO_CODING);
+
+	if (mode == MT_PHY_TYPE_EHT_MU)
+		eht->user_info[0] |= EHT_BITS(USER_INFO_STA_ID_KNOWN) |
+				     EHT_PREP(USER_INFO_STA_ID, MU_AID, rxv[8]);
+
+	usig->common |=
+		EHT_BITS(USIG_COMMON_PHY_VER_KNOWN) |
+		EHT_BITS(USIG_COMMON_BW_KNOWN) |
+		EHT_BITS(USIG_COMMON_UL_DL_KNOWN) |
+		EHT_BITS(USIG_COMMON_BSS_COLOR_KNOWN) |
+		EHT_BITS(USIG_COMMON_TXOP_KNOWN) |
+		le32_encode_bits(0, IEEE80211_RADIOTAP_EHT_USIG_COMMON_PHY_VER) |
+		le32_encode_bits(bw, IEEE80211_RADIOTAP_EHT_USIG_COMMON_BW) |
+		EHT_PREP(USIG_COMMON_UL_DL, UPLINK, rxv[5]) |
+		EHT_PREP(USIG_COMMON_BSS_COLOR, BSS_COLOR, rxv[9]) |
+		EHT_PREP(USIG_COMMON_TXOP, TXOP_DUR, rxv[9]);
+}
+EXPORT_SYMBOL_GPL(mt76_connac3_mac_decode_eht_radiotap);

drivers/net/wireless/mediatek/mt76/mt76_connac3_mac.h

@@ -142,6 +142,28 @@ enum {
 #define MT_CRXV_HE_RU3_L		GENMASK(31, 27)
 #define MT_CRXV_HE_RU3_H		GENMASK(3, 0)
 
+#define MT_CRXV_EHT_NUM_USER		GENMASK(26, 20)
+#define MT_CRXV_EHT_LTF_SIZE		GENMASK(28, 27)
+#define MT_CRXV_EHT_LDPC_EXT_SYM	BIT(30)
+#define MT_CRXV_EHT_PE_DISAMBIG		BIT(1)
+#define MT_CRXV_EHT_UPLINK		BIT(2)
+#define MT_CRXV_EHT_MU_AID		GENMASK(27, 17)
+#define MT_CRXV_EHT_BEAM_CHNG		BIT(29)
+#define MT_CRXV_EHT_DOPPLER		BIT(0)
+#define MT_CRXV_EHT_BSS_COLOR		GENMASK(15, 10)
+#define MT_CRXV_EHT_TXOP_DUR		GENMASK(23, 17)
+#define MT_CRXV_EHT_SR_MASK		GENMASK(11, 8)
+#define MT_CRXV_EHT_SR1_MASK		GENMASK(15, 12)
+#define MT_CRXV_EHT_SR2_MASK		GENMASK(19, 16)
+#define MT_CRXV_EHT_SR3_MASK		GENMASK(23, 20)
+#define MT_CRXV_EHT_RU0			GENMASK(8, 0)
+#define MT_CRXV_EHT_RU1			GENMASK(17, 9)
+#define MT_CRXV_EHT_RU2			GENMASK(26, 18)
+#define MT_CRXV_EHT_RU3_L		GENMASK(31, 27)
+#define MT_CRXV_EHT_RU3_H		GENMASK(3, 0)
+#define MT_CRXV_EHT_SIG_MCS		GENMASK(19, 18)
+#define MT_CRXV_EHT_LTF_SYM		GENMASK(22, 20)
+
 enum tx_header_format {
 	MT_HDR_FORMAT_802_3,
 	MT_HDR_FORMAT_CMD,

drivers/net/wireless/mediatek/mt76/mt7925/mac.c

@@ -590,14 +590,25 @@ mt7925_mac_fill_rx(struct mt792x_dev *dev, struct sk_buff *skb)
 			seq_ctrl = le16_to_cpu(hdr->seq_ctrl);
 			qos_ctl = *ieee80211_get_qos_ctl(hdr);
 		}
+		skb_set_mac_header(skb, (unsigned char *)hdr - skb->data);
 	} else {
 		status->flag |= RX_FLAG_8023;
 	}
 
 	mt792x_mac_assoc_rssi(dev, skb);
 
-	if (rxv && mode >= MT_PHY_TYPE_HE_SU && !(status->flag & RX_FLAG_8023))
+	if (rxv && !(status->flag & RX_FLAG_8023)) {
+		switch (status->encoding) {
+		case RX_ENC_EHT:
+			mt76_connac3_mac_decode_eht_radiotap(skb, rxv, mode);
+			break;
+		case RX_ENC_HE:
 			mt76_connac3_mac_decode_he_radiotap(skb, rxv, mode);
+			break;
+		default:
+			break;
+		}
+	}
 
 	if (!status->wcid || !ieee80211_is_data_qos(fc))
 		return 0;