wifi: mt76: mt7925: adjust rm BSS flow to prevent next connection failure

mainline inclusion
from mainline-v6.15-rc1
category: bugfix

Removing BSS without removing STAREC first will cause firmware
abnormal and next connection fail.

Fixes: 8161610 ("wifi: mt76: mt7925: Cleanup MLO settings post-disconnection")
Cc: stable@vger.kernel.org
Co-developed-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Tested-by: Caleb Jorden <cjorden@gmail.com>
Signed-off-by: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>
Link: https://patch.msgid.link/20250305000851.493671-4-sean.wang@kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit 0ebb60d)
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>

Author: Ming Yen Hsieh

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

@@ -1132,7 +1132,12 @@ static void mt7925_mac_link_sta_remove(struct mt76_dev *mdev,
 		struct mt792x_bss_conf *mconf;
 
 		mconf = mt792x_link_conf_to_mconf(link_conf);
-		mt792x_mac_link_bss_remove(dev, mconf, mlink);
+
+		if (ieee80211_vif_is_mld(vif))
+			mt792x_mac_link_bss_remove(dev, mconf, mlink);
+		else
+			mt7925_mcu_add_bss_info(&dev->phy, mconf->mt76.ctx, link_conf,
+						link_sta, false);
 	}
 
 	spin_lock_bh(&mdev->sta_poll_lock);
@@ -1152,6 +1157,31 @@ mt7925_mac_sta_remove_links(struct mt792x_dev *dev, struct ieee80211_vif *vif,
 	struct mt76_wcid *wcid;
 	unsigned int link_id;
 
+	/* clean up bss before starec */
+	for_each_set_bit(link_id, &old_links, IEEE80211_MLD_MAX_NUM_LINKS) {
+		struct ieee80211_link_sta *link_sta;
+		struct ieee80211_bss_conf *link_conf;
+		struct mt792x_bss_conf *mconf;
+		struct mt792x_link_sta *mlink;
+
+		link_sta = mt792x_sta_to_link_sta(vif, sta, link_id);
+		if (!link_sta)
+			continue;
+
+		mlink = mt792x_sta_to_link(msta, link_id);
+		if (!mlink)
+			continue;
+
+		link_conf = mt792x_vif_to_bss_conf(vif, link_id);
+		if (!link_conf)
+			continue;
+
+		mconf = mt792x_link_conf_to_mconf(link_conf);
+
+		mt7925_mcu_add_bss_info(&dev->phy, mconf->mt76.ctx, link_conf,
+					link_sta, false);
+	}
+
 	for_each_set_bit(link_id, &old_links, IEEE80211_MLD_MAX_NUM_LINKS) {
 		struct ieee80211_link_sta *link_sta;
 		struct mt792x_link_sta *mlink;
@@ -1190,44 +1220,14 @@ void mt7925_mac_sta_remove(struct mt76_dev *mdev, struct ieee80211_vif *vif,
 {
 	struct mt792x_dev *dev = container_of(mdev, struct mt792x_dev, mt76);
 	struct mt792x_sta *msta = (struct mt792x_sta *)sta->drv_priv;
-	struct {
-		struct {
-			u8 omac_idx;
-			u8 band_idx;
-			__le16 pad;
-		} __packed hdr;
-		struct req_tlv {
-			__le16 tag;
-			__le16 len;
-			u8 active;
-			u8 link_idx; /* hw link idx */
-			u8 omac_addr[ETH_ALEN];
-		} __packed tlv;
-	} dev_req = {
-		.hdr = {
-			.omac_idx = 0,
-			.band_idx = 0,
-		},
-		.tlv = {
-			.tag = cpu_to_le16(DEV_INFO_ACTIVE),
-			.len = cpu_to_le16(sizeof(struct req_tlv)),
-			.active = true,
-		},
-	};
 	unsigned long rem;
 
 	rem = ieee80211_vif_is_mld(vif) ? msta->valid_links : BIT(0);
 
 	mt7925_mac_sta_remove_links(dev, vif, sta, rem);
 
-	if (ieee80211_vif_is_mld(vif)) {
-		mt7925_mcu_set_dbdc(&dev->mphy, false);
-
-		/* recovery omac address for the legacy interface */
-		memcpy(dev_req.tlv.omac_addr, vif->addr, ETH_ALEN);
-		mt76_mcu_send_msg(mdev, MCU_UNI_CMD(DEV_INFO_UPDATE),
-				  &dev_req, sizeof(dev_req), true);
-	}
+	if (ieee80211_vif_is_mld(vif))
+		mt7925_mcu_del_dev(mdev, vif);
 
 	if (vif->type == NL80211_IFTYPE_STATION) {
 		struct mt792x_vif *mvif = (struct mt792x_vif *)vif->drv_priv;

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

@@ -2568,6 +2568,62 @@ int mt7925_mcu_set_timing(struct mt792x_phy *phy,
 				     MCU_UNI_CMD(BSS_INFO_UPDATE), true);
 }
 
+void mt7925_mcu_del_dev(struct mt76_dev *mdev,
+			struct ieee80211_vif *vif)
+{
+	struct mt76_vif_link *mvif = (struct mt76_vif_link *)vif->drv_priv;
+	struct {
+		struct {
+			u8 omac_idx;
+			u8 band_idx;
+			__le16 pad;
+		} __packed hdr;
+		struct req_tlv {
+			__le16 tag;
+			__le16 len;
+			u8 active;
+			u8 link_idx; /* hw link idx */
+			u8 omac_addr[ETH_ALEN];
+		} __packed tlv;
+	} dev_req = {
+		.tlv = {
+			.tag = cpu_to_le16(DEV_INFO_ACTIVE),
+			.len = cpu_to_le16(sizeof(struct req_tlv)),
+			.active = true,
+		},
+	};
+	struct {
+		struct {
+			u8 bss_idx;
+			u8 pad[3];
+		} __packed hdr;
+		struct mt76_connac_bss_basic_tlv basic;
+	} basic_req = {
+		.basic = {
+			.tag = cpu_to_le16(UNI_BSS_INFO_BASIC),
+			.len = cpu_to_le16(sizeof(struct mt76_connac_bss_basic_tlv)),
+			.active = true,
+			.conn_state = 1,
+		},
+	};
+
+	dev_req.hdr.omac_idx = mvif->omac_idx;
+	dev_req.hdr.band_idx = mvif->band_idx;
+
+	basic_req.hdr.bss_idx = mvif->idx;
+	basic_req.basic.omac_idx = mvif->omac_idx;
+	basic_req.basic.band_idx = mvif->band_idx;
+	basic_req.basic.link_idx = mvif->link_idx;
+
+	mt76_mcu_send_msg(mdev, MCU_UNI_CMD(BSS_INFO_UPDATE),
+			  &basic_req, sizeof(basic_req), true);
+
+	/* recovery omac address for the legacy interface */
+	memcpy(dev_req.tlv.omac_addr, vif->addr, ETH_ALEN);
+	mt76_mcu_send_msg(mdev, MCU_UNI_CMD(DEV_INFO_UPDATE),
+			  &dev_req, sizeof(dev_req), true);
+}
+
 int mt7925_mcu_add_bss_info(struct mt792x_phy *phy,
 			    struct ieee80211_chanctx_conf *ctx,
 			    struct ieee80211_bss_conf *link_conf,

drivers/net/wireless/mediatek/mt76/mt7925/mcu.h

@@ -627,6 +627,8 @@ int mt7925_mcu_sched_scan_req(struct mt76_phy *phy,
 int mt7925_mcu_sched_scan_enable(struct mt76_phy *phy,
 				 struct ieee80211_vif *vif,
 				 bool enable);
+void mt7925_mcu_del_dev(struct mt76_dev *mdev,
+			struct ieee80211_vif *vif);
 int mt7925_mcu_add_bss_info(struct mt792x_phy *phy,
 			    struct ieee80211_chanctx_conf *ctx,
 			    struct ieee80211_bss_conf *link_conf,