mt76: mt7915: introduce 802.11ax multi-bss support

Introduce mbss mcu APIs to enable 802.11ax multi-bss AP support for
mt7915 devices
Tested-by: NMoney Wang <money.wang@mediatek.com>
Co-developed-by: NRyder Lee <ryder.lee@mediatek.com>
Signed-off-by: NRyder Lee <ryder.lee@mediatek.com>
Co-developed-by: NMoney Wang <money.wang@mediatek.com>
Signed-off-by: NMoney Wang <money.wang@mediatek.com>
Signed-off-by: NLorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: NFelix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c

@@ -2675,11 +2675,25 @@ int mt76_connac_mcu_bss_basic_tlv(struct sk_buff *skb,
 	struct bss_info_basic *bss;
 	struct tlv *tlv;
 
+	tlv = mt76_connac_mcu_add_tlv(skb, BSS_INFO_BASIC, sizeof(*bss));
+	bss = (struct bss_info_basic *)tlv;
+
 	switch (vif->type) {
 	case NL80211_IFTYPE_MESH_POINT:
-	case NL80211_IFTYPE_AP:
 	case NL80211_IFTYPE_MONITOR:
 		break;
+	case NL80211_IFTYPE_AP:
+		if (ieee80211_hw_check(phy->hw, SUPPORTS_MULTI_BSSID)) {
+			u8 bssid_id = vif->bss_conf.bssid_indicator;
+			struct wiphy *wiphy = phy->hw->wiphy;
+
+			if (bssid_id > ilog2(wiphy->mbssid_max_interfaces))
+				return -EINVAL;
+
+			bss->non_tx_bssid = vif->bss_conf.bssid_index;
+			bss->max_bssid = bssid_id;
+		}
+		break;
 	case NL80211_IFTYPE_STATION:
 		if (enable) {
 			rcu_read_lock();
@@ -2704,9 +2718,6 @@ int mt76_connac_mcu_bss_basic_tlv(struct sk_buff *skb,
 		break;
 	}
 
-	tlv = mt76_connac_mcu_add_tlv(skb, BSS_INFO_BASIC, sizeof(*bss));
-
-	bss = (struct bss_info_basic *)tlv;
 	bss->network_type = cpu_to_le32(type);
 	bss->bmc_wcid_lo = to_wcid_lo(wlan_idx);
 	bss->bmc_wcid_hi = to_wcid_hi(wlan_idx);

drivers/net/wireless/mediatek/mt76/mt7915/init.c

@@ -343,6 +343,7 @@ mt7915_init_wiphy(struct ieee80211_hw *hw)
 	wiphy->n_iface_combinations = ARRAY_SIZE(if_comb);
 	wiphy->reg_notifier = mt7915_regd_notifier;
 	wiphy->flags |= WIPHY_FLAG_HAS_CHANNEL_SWITCH;
+	wiphy->mbssid_max_interfaces = 16;
 
 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_BSS_COLOR);
 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_VHT_IBSS);
@@ -360,6 +361,7 @@ mt7915_init_wiphy(struct ieee80211_hw *hw)
 	ieee80211_hw_set(hw, HAS_RATE_CONTROL);
 	ieee80211_hw_set(hw, SUPPORTS_TX_ENCAP_OFFLOAD);
 	ieee80211_hw_set(hw, SUPPORTS_RX_DECAP_OFFLOAD);
+	ieee80211_hw_set(hw, SUPPORTS_MULTI_BSSID);
 	ieee80211_hw_set(hw, WANT_MONITOR_VIF);
 
 	hw->max_tx_fragments = 4;

drivers/net/wireless/mediatek/mt76/mt7915/mcu.c

@@ -1825,6 +1825,55 @@ mt7915_mcu_beacon_cntdwn(struct ieee80211_vif *vif, struct sk_buff *rskb,
 	info->cnt = skb->data[offs->cntdwn_counter_offs[0]];
 }
 
+static void
+mt7915_mcu_beacon_mbss(struct sk_buff *rskb, struct sk_buff *skb,
+		       struct ieee80211_vif *vif, struct bss_info_bcn *bcn,
+		       struct ieee80211_mutable_offsets *offs)
+{
+	struct bss_info_bcn_mbss *mbss;
+	const struct element *elem;
+	struct tlv *tlv;
+
+	if (!vif->bss_conf.bssid_indicator)
+		return;
+
+	tlv = mt7915_mcu_add_nested_subtlv(rskb, BSS_INFO_BCN_MBSSID,
+					   sizeof(*mbss), &bcn->sub_ntlv,
+					   &bcn->len);
+
+	mbss = (struct bss_info_bcn_mbss *)tlv;
+	mbss->offset[0] = cpu_to_le16(offs->tim_offset);
+	mbss->bitmap = cpu_to_le32(1);
+
+	for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID,
+			    &skb->data[offs->mbssid_off],
+			    skb->len - offs->mbssid_off) {
+		const struct element *sub_elem;
+
+		if (elem->datalen < 2)
+			continue;
+
+		for_each_element(sub_elem, elem->data + 1, elem->datalen - 1) {
+			const u8 *data;
+
+			if (sub_elem->id || sub_elem->datalen < 4)
+				continue; /* not a valid BSS profile */
+
+			/* Find WLAN_EID_MULTI_BSSID_IDX
+			 * in the merged nontransmitted profile
+			 */
+			data = cfg80211_find_ie(WLAN_EID_MULTI_BSSID_IDX,
+						sub_elem->data,
+						sub_elem->datalen);
+			if (!data || data[1] < 1 || !data[2])
+				continue;
+
+			mbss->offset[data[2]] = cpu_to_le16(data - skb->data);
+			mbss->bitmap |= cpu_to_le32(BIT(data[2]));
+		}
+	}
+}
+
 static void
 mt7915_mcu_beacon_cont(struct mt7915_dev *dev, struct ieee80211_vif *vif,
 		       struct sk_buff *rskb, struct sk_buff *skb,
@@ -1952,6 +2001,9 @@ int mt7915_mcu_add_beacon(struct ieee80211_hw *hw,
 	int len = MT7915_BEACON_UPDATE_SIZE + MAX_BEACON_SIZE;
 	bool ext_phy = phy != &dev->phy;
 
+	if (vif->bss_conf.nontransmitted)
+		return 0;
+
 	rskb = __mt76_connac_mcu_alloc_sta_req(&dev->mt76, &mvif->mt76,
 					       NULL, len);
 	if (IS_ERR(rskb))
@@ -1981,8 +2033,8 @@ int mt7915_mcu_add_beacon(struct ieee80211_hw *hw,
 
 	mt7915_mcu_beacon_check_caps(phy, vif, skb);
 
-	/* TODO: subtag - 11v MBSSID */
 	mt7915_mcu_beacon_cntdwn(vif, rskb, skb, bcn, &offs);
+	mt7915_mcu_beacon_mbss(rskb, skb, vif, bcn, &offs);
 	mt7915_mcu_beacon_cont(dev, vif, rskb, skb, bcn, &offs);
 	dev_kfree_skb(skb);