mt76: mt7615: introduce BSS absence event

Introduce BSS absence event that is reported when the fw
is leaving or entering current operational channel.
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7615/mcu.c

@@ -339,6 +339,26 @@ mt7615_mcu_scan_event(struct mt7615_dev *dev, struct sk_buff *skb)
 				     MT7615_HW_SCAN_TIMEOUT);
 }
 
+static void
+mt7615_mcu_bss_event(struct mt7615_dev *dev, struct sk_buff *skb)
+{
+	struct mt7615_mcu_bss_event *event;
+	struct mt76_phy *mphy;
+
+	event = (struct mt7615_mcu_bss_event *)(skb->data +
+						sizeof(struct mt7615_mcu_rxd));
+
+	if (event->bss_idx && dev->mt76.phy2)
+		mphy = dev->mt76.phy2;
+	else
+		mphy = &dev->mt76.phy;
+
+	if (event->is_absent)
+		ieee80211_stop_queues(mphy->hw);
+	else
+		ieee80211_wake_queues(mphy->hw);
+}
+
 static void
 mt7615_mcu_rx_unsolicited_event(struct mt7615_dev *dev, struct sk_buff *skb)
 {
@@ -352,6 +372,9 @@ mt7615_mcu_rx_unsolicited_event(struct mt7615_dev *dev, struct sk_buff *skb)
 	case MCU_EVENT_SCAN_DONE:
 		mt7615_mcu_scan_event(dev, skb);
 		return;
+	case MCU_EVENT_BSS_ABSENCE:
+		mt7615_mcu_bss_event(dev, skb);
+		break;
 	default:
 		break;
 	}
@@ -367,6 +390,7 @@ void mt7615_mcu_rx_event(struct mt7615_dev *dev, struct sk_buff *skb)
 	    rxd->ext_eid == MCU_EXT_EVENT_ASSERT_DUMP ||
 	    rxd->ext_eid == MCU_EXT_EVENT_PS_SYNC ||
 	    rxd->eid == MCU_EVENT_SCHED_SCAN_DONE ||
+	    rxd->eid == MCU_EVENT_BSS_ABSENCE ||
 	    rxd->eid == MCU_EVENT_SCAN_DONE ||
 	    !rxd->seq)
 		mt7615_mcu_rx_unsolicited_event(dev, skb);

drivers/net/wireless/mediatek/mt76/mt7615/mcu.h

@@ -82,6 +82,7 @@ enum {
 	MCU_EVENT_ACCESS_REG = 0x02,
 	MCU_EVENT_MT_PATCH_SEM = 0x04,
 	MCU_EVENT_SCAN_DONE = 0x0d,
+	MCU_EVENT_BSS_ABSENCE  = 0x11,
 	MCU_EVENT_CH_PRIVILEGE = 0x18,
 	MCU_EVENT_SCHED_SCAN_DONE = 0x23,
 	MCU_EVENT_EXT = 0xed,
@@ -398,6 +399,13 @@ struct nt7615_sched_scan_done {
 	__le16 pad;
 } __packed;
 
+struct mt7615_mcu_bss_event {
+	u8 bss_idx;
+	u8 is_absent;
+	u8 free_quota;
+	u8 pad;
+} __packed;
+
 /* offload mcu commands */
 enum {
 	MCU_CMD_START_HW_SCAN = MCU_CE_PREFIX | 0x03,