wifi: mt76: add WED RX support to mt76_dma_rx_fill

Introduce the capability to refill WED RX buffers in mt76_dma_rx_fill
utility routine.

Tested-by: Daniel Golle <daniel@makrotopia.org>
Co-developed-by: Sujuan Chen <sujuan.chen@mediatek.com>
Signed-off-by: Sujuan Chen <sujuan.chen@mediatek.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -550,24 +550,45 @@ mt76_dma_tx_queue_skb(struct mt76_dev *dev, struct mt76_queue *q,
 	return ret;
 }
 
+static struct page_frag_cache *
+mt76_dma_rx_get_frag_cache(struct mt76_dev *dev, struct mt76_queue *q)
+{
+	struct page_frag_cache *rx_page = &q->rx_page;
+
+#ifdef CONFIG_NET_MEDIATEK_SOC_WED
+	if ((q->flags & MT_QFLAG_WED) &&
+	    FIELD_GET(MT_QFLAG_WED_TYPE, q->flags) == MT76_WED_Q_RX)
+		rx_page = &dev->mmio.wed.rx_buf_ring.rx_page;
+#endif
+	return rx_page;
+}
+
 static int
 mt76_dma_rx_fill(struct mt76_dev *dev, struct mt76_queue *q)
 {
-	dma_addr_t addr;
-	void *buf;
-	int frames = 0;
+	struct page_frag_cache *rx_page = mt76_dma_rx_get_frag_cache(dev, q);
 	int len = SKB_WITH_OVERHEAD(q->buf_size);
-	int offset = q->buf_offset;
+	int frames = 0, offset = q->buf_offset;
+	dma_addr_t addr;
 
 	if (!q->ndesc)
 		return 0;
 
 	spin_lock_bh(&q->lock);
 
 	while (q->queued < q->ndesc - 1) {
+		struct mt76_txwi_cache *t = NULL;
 		struct mt76_queue_buf qbuf;
+		void *buf = NULL;
+
+		if ((q->flags & MT_QFLAG_WED) &&
+		    FIELD_GET(MT_QFLAG_WED_TYPE, q->flags) == MT76_WED_Q_RX) {
+			t = mt76_get_rxwi(dev);
+			if (!t)
+				break;
+		}
 
-		buf = page_frag_alloc(&q->rx_page, q->buf_size, GFP_ATOMIC);
+		buf = page_frag_alloc(rx_page, q->buf_size, GFP_ATOMIC);
 		if (!buf)
 			break;
 
@@ -580,7 +601,7 @@ mt76_dma_rx_fill(struct mt76_dev *dev, struct mt76_queue *q)
 		qbuf.addr = addr + offset;
 		qbuf.len = len - offset;
 		qbuf.skip_unmap = false;
-		mt76_dma_add_buf(dev, q, &qbuf, 1, 0, buf, NULL);
+		mt76_dma_add_buf(dev, q, &qbuf, 1, 0, buf, t);
 		frames++;
 	}