mt76: mt7615: add ibss support

Enable IFTYPE_ADHOC support on 7615 devices. The feature has been tested
using a mt76x2 device as wireless peer.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -177,6 +177,9 @@ static struct ieee80211_rate mt7615_rates[] = {
 
 static const struct ieee80211_iface_limit if_limits[] = {
 	{
+		.max = 1,
+		.types = BIT(NL80211_IFTYPE_ADHOC)
+	}, {
 		.max = MT7615_MAX_INTERFACES,
 		.types = BIT(NL80211_IFTYPE_AP) |
 #ifdef CONFIG_MAC80211_MESH
@@ -289,6 +292,8 @@ int mt7615_register_device(struct mt7615_dev *dev)
 	wiphy->reg_notifier = mt7615_regd_notifier;
 	wiphy->flags |= WIPHY_FLAG_HAS_CHANNEL_SWITCH;
 
+	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_VHT_IBSS);
+
 	ieee80211_hw_set(hw, TX_STATUS_NO_AMPDU_LEN);
 
 	dev->mt76.sband_2g.sband.ht_cap.cap |= IEEE80211_HT_CAP_LDPC_CODING;
@@ -303,6 +308,7 @@ int mt7615_register_device(struct mt7615_dev *dev)
 	dev->dfs_state = -1;
 
 	wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
+				 BIT(NL80211_IFTYPE_ADHOC) |
 #ifdef CONFIG_MAC80211_MESH
 				 BIT(NL80211_IFTYPE_MESH_POINT) |
 #endif

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

@@ -41,6 +41,7 @@ static int get_omac_idx(enum nl80211_iftype type, u32 mask)
 	switch (type) {
 	case NL80211_IFTYPE_AP:
 	case NL80211_IFTYPE_MESH_POINT:
+	case NL80211_IFTYPE_ADHOC:
 		/* ap use hw bssid 0 and ext bssid */
 		if (~mask & BIT(HW_BSSID_0))
 			return HW_BSSID_0;

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

@@ -848,6 +848,11 @@ int mt7615_mcu_set_bss_info(struct mt7615_dev *dev,
 		conn_type = CONNECTION_INFRA_STA;
 		break;
 	}
+	case NL80211_IFTYPE_ADHOC:
+		conn_type = CONNECTION_IBSS_ADHOC;
+		tx_wlan_idx = mvif->sta.wcid.idx;
+		net_type = NETWORK_IBSS;
+		break;
 	default:
 		WARN_ON(1);
 		break;
@@ -1073,6 +1078,9 @@ int mt7615_mcu_set_sta_rec(struct mt7615_dev *dev, struct ieee80211_vif *vif,
 	case NL80211_IFTYPE_STATION:
 		req.basic.conn_type = cpu_to_le32(CONNECTION_INFRA_AP);
 		break;
+	case NL80211_IFTYPE_ADHOC:
+		req.basic.conn_type = cpu_to_le32(CONNECTION_IBSS_ADHOC);
+		break;
 	default:
 		WARN_ON(1);
 		break;