wifi: mt76: add mt76_connac_mcu_build_rnr_scan_param routine

Introduce mt76_connac_mcu_build_rnr_scan_param routine for handling
RNR scan. This is a preliminary patch to enable RNR scan in mt7921 and
mt7925 driver.

Signed-off-by: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>
Link: https://patch.msgid.link/20250321013829.3598-1-mingyen.hsieh@mediatek.com
Signed-off-by: Felix Fietkau <nbd@nbd.name>

3 files changed, 53 insertions, 0 deletions

diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index d7cd467b812f..ee6ed89fe496 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -162,6 +162,16 @@ enum mt76_dfs_state {
 	MT_DFS_STATE_ACTIVE,
 };
 
+#define MT76_RNR_SCAN_MAX_BSSIDS       16
+struct mt76_scan_rnr_param {
+	u8 bssid[MT76_RNR_SCAN_MAX_BSSIDS][ETH_ALEN];
+	u8 channel[MT76_RNR_SCAN_MAX_BSSIDS];
+	u8 random_mac[ETH_ALEN];
+	u8 seq_num;
+	u8 bssid_num;
+	u32 sreq_flag;
+};
+
 struct mt76_queue_buf {
 	dma_addr_t addr;
 	u16 len:15,
@@ -941,6 +951,8 @@ struct mt76_dev {
 	char alpha2[3];
 	enum nl80211_dfs_regions region;
 
+	struct mt76_scan_rnr_param rnr;
+
 	u32 debugfs_reg;
 
 	u8 csa_complete;
diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
index 5f79a7f083d2..cb13d0a76878 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
@@ -1666,6 +1666,44 @@ int mt76_connac_mcu_uni_add_bss(struct mt76_phy *phy,
 }
 EXPORT_SYMBOL_GPL(mt76_connac_mcu_uni_add_bss);
 
+void mt76_connac_mcu_build_rnr_scan_param(struct mt76_dev *mdev,
+					  struct cfg80211_scan_request *sreq)
+{
+	struct ieee80211_channel **scan_list = sreq->channels;
+	int i, bssid_index = 0;
+
+	/* clear 6G active Scan BSSID table */
+	memset(&mdev->rnr, 0, sizeof(mdev->rnr));
+
+	for (i = 0; i < sreq->n_6ghz_params; i++) {
+		u8 ch_idx = sreq->scan_6ghz_params[i].channel_idx;
+		int k = 0;
+
+		/* Remove the duplicated BSSID */
+		for (k = 0; k < bssid_index; k++) {
+			if (!memcmp(&mdev->rnr.bssid[k],
+				    sreq->scan_6ghz_params[i].bssid,
+				    ETH_ALEN))
+				break;
+		}
+
+		if (k == bssid_index &&
+		    bssid_index < MT76_RNR_SCAN_MAX_BSSIDS) {
+			memcpy(&mdev->rnr.bssid[bssid_index++],
+			       sreq->scan_6ghz_params[i].bssid, ETH_ALEN);
+			mdev->rnr.channel[k] = scan_list[ch_idx]->hw_value;
+		}
+	}
+
+	mdev->rnr.bssid_num = bssid_index;
+
+	if (sreq->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) {
+		memcpy(mdev->rnr.random_mac, sreq->mac_addr, ETH_ALEN);
+		mdev->rnr.sreq_flag = sreq->flags;
+	}
+}
+EXPORT_SYMBOL_GPL(mt76_connac_mcu_build_rnr_scan_param);
+
 #define MT76_CONNAC_SCAN_CHANNEL_TIME		60
 int mt76_connac_mcu_hw_scan(struct mt76_phy *phy, struct ieee80211_vif *vif,
 			    struct ieee80211_scan_request *scan_req)
diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.h b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.h
index 478cd1886736..5f1ae9617aa6 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.h
@@ -869,6 +869,7 @@ enum {
 #define NETWORK_WDS			BIT(21)
 
 #define SCAN_FUNC_RANDOM_MAC		BIT(0)
+#define SCAN_FUNC_RNR_SCAN		BIT(3)
 #define SCAN_FUNC_SPLIT_SCAN		BIT(5)
 
 #define CONNECTION_INFRA_STA		(STA_TYPE_STA | NETWORK_INFRA)
@@ -1972,6 +1973,8 @@ int mt76_connac_mcu_start_patch(struct mt76_dev *dev);
 int mt76_connac_mcu_patch_sem_ctrl(struct mt76_dev *dev, bool get);
 int mt76_connac_mcu_start_firmware(struct mt76_dev *dev, u32 addr, u32 option);
 
+void mt76_connac_mcu_build_rnr_scan_param(struct mt76_dev *mdev,
+					  struct cfg80211_scan_request *sreq);
 int mt76_connac_mcu_hw_scan(struct mt76_phy *phy, struct ieee80211_vif *vif,
 			    struct ieee80211_scan_request *scan_req);
 int mt76_connac_mcu_cancel_hw_scan(struct mt76_phy *phy,