wifi: mt76: add vif link specific data structure

Preparation for splitting link data from vif data for MLO support.

Link: https://patch.msgid.link/[email protected]
Signed-off-by: Felix Fietkau <[email protected]>

Author: nbd168

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

@@ -766,6 +766,15 @@ struct mt76_vif_link {
 	u8 beacon_rates_idx;
 	struct ieee80211_chanctx_conf *ctx;
 	struct mt76_wcid *wcid;
+	struct mt76_vif_data *mvif;
+	struct rcu_head rcu_head;
+};
+
+struct mt76_vif_data {
+	struct mt76_vif_link __rcu *link[IEEE80211_MLD_MAX_NUM_LINKS];
+
+	u16 valid_links;
+	u8 deflink_id;
 };
 
 struct mt76_phy {
@@ -1168,6 +1177,10 @@ static inline int mt76_wed_dma_setup(struct mt76_dev *dev, struct mt76_queue *q,
 	for (i = 0; i < ARRAY_SIZE((dev)->q_rx); i++)	\
 		if ((dev)->q_rx[i].ndesc)
 
+
+#define mt76_dereference(p, dev) \
+	rcu_dereference_protected(p, lockdep_is_held(&(dev)->mutex))
+
 struct mt76_dev *mt76_alloc_device(struct device *pdev, unsigned int size,
 				   const struct ieee80211_ops *ops,
 				   const struct mt76_driver_ops *drv_ops);
@@ -1755,4 +1768,44 @@ void mt76_wcid_init(struct mt76_wcid *wcid);
 void mt76_wcid_cleanup(struct mt76_dev *dev, struct mt76_wcid *wcid);
 void mt76_wcid_add_poll(struct mt76_dev *dev, struct mt76_wcid *wcid);
 
+static inline void
+mt76_vif_init(struct ieee80211_vif *vif, struct mt76_vif_data *mvif)
+{
+	struct mt76_vif_link *mlink = (struct mt76_vif_link *)vif->drv_priv;
+
+	mlink->mvif = mvif;
+	rcu_assign_pointer(mvif->link[0], mlink);
+}
+
+static inline void
+mt76_vif_cleanup(struct mt76_dev *dev, struct ieee80211_vif *vif)
+{
+	struct mt76_vif_link *mlink = (struct mt76_vif_link *)vif->drv_priv;
+	struct mt76_vif_data *mvif = mlink->mvif;
+
+	rcu_assign_pointer(mvif->link[0], NULL);
+}
+
+static inline struct mt76_vif_link *
+mt76_vif_link(struct mt76_dev *dev, struct ieee80211_vif *vif, int link_id)
+{
+	struct mt76_vif_link *mlink = (struct mt76_vif_link *)vif->drv_priv;
+	struct mt76_vif_data *mvif = mlink->mvif;
+
+	return mt76_dereference(mvif->link[link_id], dev);
+}
+
+static inline struct mt76_vif_link *
+mt76_vif_conf_link(struct mt76_dev *dev, struct ieee80211_vif *vif,
+		   struct ieee80211_bss_conf *link_conf)
+{
+	struct mt76_vif_link *mlink = (struct mt76_vif_link *)vif->drv_priv;
+	struct mt76_vif_data *mvif = mlink->mvif;
+
+	if (link_conf == &vif->bss_conf)
+		return mlink;
+
+	return mt76_dereference(mvif->link[link_conf->link_id], dev);
+}
+
 #endif