mt76: introduce mt76_tx_info data structure

Add mt76_tx_info as auxiliary data structure to pass values
to tx_prepare_skb pointer. This is a preliminary patch to add
support for new chipsets (e.g. mt7615)
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -283,13 +283,12 @@ int mt76_dma_tx_queue_skb(struct mt76_dev *dev, enum mt76_txq_id qid,
 			  struct ieee80211_sta *sta)
 {
 	struct mt76_queue *q = dev->q_tx[qid].q;
+	struct mt76_tx_info tx_info = {};
+	int len, n = 0, ret = -ENOMEM;
 	struct mt76_queue_entry e;
 	struct mt76_txwi_cache *t;
-	struct mt76_queue_buf buf[32];
-	int len, n = 0, ret = -ENOMEM;
 	struct sk_buff *iter;
 	dma_addr_t addr;
-	u32 tx_info = 0;
 
 	t = mt76_get_txwi(dev);
 	if (!t) {
@@ -306,13 +305,13 @@ int mt76_dma_tx_queue_skb(struct mt76_dev *dev, enum mt76_txq_id qid,
 	if (dma_mapping_error(dev->dev, addr))
 		goto free;
 
-	buf[n].addr = t->dma_addr;
-	buf[n++].len = dev->drv->txwi_size;
-	buf[n].addr = addr;
-	buf[n++].len = len;
+	tx_info.buf[n].addr = t->dma_addr;
+	tx_info.buf[n++].len = dev->drv->txwi_size;
+	tx_info.buf[n].addr = addr;
+	tx_info.buf[n++].len = len;
 
 	skb_walk_frags(skb, iter) {
-		if (n == ARRAY_SIZE(buf))
+		if (n == ARRAY_SIZE(tx_info.buf))
 			goto unmap;
 
 		addr = dma_map_single(dev->dev, iter->data, iter->len,
@@ -320,9 +319,10 @@ int mt76_dma_tx_queue_skb(struct mt76_dev *dev, enum mt76_txq_id qid,
 		if (dma_mapping_error(dev->dev, addr))
 			goto unmap;
 
-		buf[n].addr = addr;
-		buf[n++].len = iter->len;
+		tx_info.buf[n].addr = addr;
+		tx_info.buf[n++].len = iter->len;
 	}
+	tx_info.nbuf = n;
 
 	dma_sync_single_for_cpu(dev->dev, t->dma_addr, sizeof(t->txwi),
 				DMA_TO_DEVICE);
@@ -333,17 +333,18 @@ int mt76_dma_tx_queue_skb(struct mt76_dev *dev, enum mt76_txq_id qid,
 	if (ret < 0)
 		goto unmap;
 
-	if (q->queued + (n + 1) / 2 >= q->ndesc - 1) {
+	if (q->queued + (tx_info.nbuf + 1) / 2 >= q->ndesc - 1) {
 		ret = -ENOMEM;
 		goto unmap;
 	}
 
-	return mt76_dma_add_buf(dev, q, buf, n, tx_info, skb, t);
+	return mt76_dma_add_buf(dev, q, tx_info.buf, tx_info.nbuf,
+				tx_info.info, skb, t);
 
 unmap:
 	for (n--; n > 0; n--)
-		dma_unmap_single(dev->dev, buf[n].addr, buf[n].len,
-				 DMA_TO_DEVICE);
+		dma_unmap_single(dev->dev, tx_info.buf[n].addr,
+				 tx_info.buf[n].len, DMA_TO_DEVICE);
 
 free:
 	e.skb = skb;

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

@@ -83,6 +83,12 @@ struct mt76_queue_buf {
 	int len;
 };
 
+struct mt76_tx_info {
+	struct mt76_queue_buf buf[32];
+	int nbuf;
+	u32 info;
+};
+
 struct mt76u_buf {
 	struct mt76_dev *dev;
 	struct urb *urb;
@@ -296,7 +302,8 @@ struct mt76_driver_ops {
 	int (*tx_prepare_skb)(struct mt76_dev *dev, void *txwi_ptr,
 			      struct sk_buff *skb, enum mt76_txq_id qid,
 			      struct mt76_wcid *wcid,
-			      struct ieee80211_sta *sta, u32 *tx_info);
+			      struct ieee80211_sta *sta,
+			      struct mt76_tx_info *tx_info);
 
 	void (*tx_complete_skb)(struct mt76_dev *dev, enum mt76_txq_id qid,
 				struct mt76_queue_entry *e);

drivers/net/wireless/mediatek/mt76/mt7603/mac.c

@@ -914,7 +914,7 @@ mt7603_mac_write_txwi(struct mt7603_dev *dev, __le32 *txwi,
 int mt7603_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
 			  struct sk_buff *skb, enum mt76_txq_id qid,
 			  struct mt76_wcid *wcid, struct ieee80211_sta *sta,
-			  u32 *tx_info)
+			  struct mt76_tx_info *tx_info)
 {
 	struct mt7603_dev *dev = container_of(mdev, struct mt7603_dev, mt76);
 	struct mt7603_sta *msta = container_of(wcid, struct mt7603_sta, wcid);

drivers/net/wireless/mediatek/mt76/mt7603/mt7603.h

@@ -225,7 +225,7 @@ void mt7603_filter_tx(struct mt7603_dev *dev, int idx, bool abort);
 int mt7603_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
 			  struct sk_buff *skb, enum mt76_txq_id qid,
 			  struct mt76_wcid *wcid, struct ieee80211_sta *sta,
-			  u32 *tx_info);
+			  struct mt76_tx_info *tx_info);
 
 void mt7603_tx_complete_skb(struct mt76_dev *mdev, enum mt76_txq_id qid,
 			    struct mt76_queue_entry *e);

drivers/net/wireless/mediatek/mt76/mt76x02.h

@@ -174,7 +174,7 @@ void mt76x02_tx(struct ieee80211_hw *hw, struct ieee80211_tx_control *control,
 int mt76x02_tx_prepare_skb(struct mt76_dev *mdev, void *txwi,
 			   struct sk_buff *skb, enum mt76_txq_id qid,
 			   struct mt76_wcid *wcid, struct ieee80211_sta *sta,
-			   u32 *tx_info);
+			   struct mt76_tx_info *tx_info);
 void mt76x02_sw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 		     const u8 *mac);
 void mt76x02_sw_scan_complete(struct ieee80211_hw *hw,

drivers/net/wireless/mediatek/mt76/mt76x02_txrx.c

@@ -149,7 +149,7 @@ EXPORT_SYMBOL_GPL(mt76x02_tx_status_data);
 int mt76x02_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
 			   struct sk_buff *skb, enum mt76_txq_id qid,
 			   struct mt76_wcid *wcid, struct ieee80211_sta *sta,
-			   u32 *tx_info)
+			   struct mt76_tx_info *tx_info)
 {
 	struct mt76x02_dev *dev = container_of(mdev, struct mt76x02_dev, mt76);
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
@@ -169,11 +169,11 @@ int mt76x02_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
 	if (pid >= MT_PACKET_ID_FIRST)
 		qsel = MT_QSEL_MGMT;
 
-	*tx_info = FIELD_PREP(MT_TXD_INFO_QSEL, qsel) |
-		   MT_TXD_INFO_80211;
+	tx_info->info = FIELD_PREP(MT_TXD_INFO_QSEL, qsel) |
+			MT_TXD_INFO_80211;
 
 	if (!wcid || wcid->hw_key_idx == 0xff || wcid->sw_iv)
-		*tx_info |= MT_TXD_INFO_WIV;
+		tx_info->info |= MT_TXD_INFO_WIV;
 
 	return 0;
 }

drivers/net/wireless/mediatek/mt76/mt76x02_usb.h

@@ -28,7 +28,7 @@ int mt76x02u_skb_dma_info(struct sk_buff *skb, int port, u32 flags);
 int mt76x02u_tx_prepare_skb(struct mt76_dev *mdev, void *data,
 			    struct sk_buff *skb, enum mt76_txq_id qid,
 			    struct mt76_wcid *wcid, struct ieee80211_sta *sta,
-			    u32 *tx_info);
+			    struct mt76_tx_info *tx_info);
 void mt76x02u_tx_complete_skb(struct mt76_dev *mdev, enum mt76_txq_id qid,
 			      struct mt76_queue_entry *e);
 #endif /* __MT76x02_USB_H */

drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c

@@ -74,7 +74,7 @@ int mt76x02u_skb_dma_info(struct sk_buff *skb, int port, u32 flags)
 int mt76x02u_tx_prepare_skb(struct mt76_dev *mdev, void *data,
 			    struct sk_buff *skb, enum mt76_txq_id qid,
 			    struct mt76_wcid *wcid, struct ieee80211_sta *sta,
-			    u32 *tx_info)
+			    struct mt76_tx_info *tx_info)
 {
 	struct mt76x02_dev *dev = container_of(mdev, struct mt76x02_dev, mt76);
 	int pid, len = skb->len, ep = q2ep(mdev->q_tx[qid].q->hw_idx);