mt76: use a per rx queue page fragment cache

Using the NAPI or netdev frag cache along with other drivers can lead to
32 KiB pages being held for a long time, despite only being used for
very few page fragments.

This can happen if the driver grabs one or two fragments for rx ring
refill, while other drivers use (and free up) the remaining fragments.
The 32 KiB higher-order page can only be freed once all users have freed
their fragments.

Depending on the traffic patterns, this can waste a lot of memory and
look a lot like a memory leak.

Signed-off-by: Felix Fietkau <[email protected]>

dma.c

@@ -248,19 +248,13 @@ mt76_dma_rx_fill(struct mt76_dev *dev, struct mt76_queue *q, bool napi)
 	int len = SKB_WITH_OVERHEAD(q->buf_size);
 	int offset = q->buf_offset;
 	int idx;
-	void *(*alloc)(unsigned int fragsz);
-
-	if (napi)
-		alloc = napi_alloc_frag;
-	else
-		alloc = netdev_alloc_frag;
 
 	spin_lock_bh(&q->lock);
 
 	while (q->queued < q->ndesc - 1) {
 		struct mt76_queue_buf qbuf;
 
-		buf = alloc(q->buf_size);
+		buf = page_frag_alloc(&q->rx_page, q->buf_size, GFP_ATOMIC);
 		if (!buf)
 			break;
 
@@ -287,6 +281,7 @@ mt76_dma_rx_fill(struct mt76_dev *dev, struct mt76_queue *q, bool napi)
 static void
 mt76_dma_rx_cleanup(struct mt76_dev *dev, struct mt76_queue *q)
 {
+	struct page *page;
 	void *buf;
 	bool more;
 
@@ -299,6 +294,13 @@ mt76_dma_rx_cleanup(struct mt76_dev *dev, struct mt76_queue *q)
 		skb_free_frag(buf);
 	} while (1);
 	spin_unlock_bh(&q->lock);
+
+	if (!q->rx_page.va)
+		return;
+
+	page = virt_to_page(q->rx_page.va);
+	__page_frag_cache_drain(page, q->rx_page.pagecnt_bias);
+	memset(&q->rx_page, 0, sizeof(q->rx_page));
 }
 
 static void

mt76.h

@@ -99,6 +99,7 @@ struct mt76_queue {
 
 	dma_addr_t desc_dma;
 	struct sk_buff *rx_head;
+	struct page_frag_cache rx_page;
 };
 
 struct mt76_queue_ops {