From 7873df2f26b6b5b22f8f6f696f4830a5282f6621 Mon Sep 17 00:00:00 2001
From: Evelyn Tsai <evelyn.tsai@mediatek.com>
Date: Sun, 4 Feb 2024 17:52:44 +0800
Subject: [PATCH 2008/2012] wifi: mt76: connac: wed: add wed rx copy skb

Signed-off-by: Sujuan Chen <sujuan.chen@mediatek.com>
---
 dma.c | 71 +++++++++++++++++++++++++++++++++++++++++++++--------------
 wed.c | 37 ++++++++++++++++++++++---------
 2 files changed, 80 insertions(+), 28 deletions(-)

diff --git a/dma.c b/dma.c
index 53597b5..2f108de 100644
--- a/dma.c
+++ b/dma.c
@@ -225,10 +225,10 @@ void mt76_dma_queue_reset(struct mt76_dev *dev, struct mt76_queue *q)
 
 static int
 mt76_dma_add_rx_buf(struct mt76_dev *dev, struct mt76_queue *q,
-		    struct mt76_queue_buf *buf, void *data)
+		    struct mt76_queue_buf *buf, void *data,
+		    struct mt76_rxwi_cache *rxwi)
 {
 	struct mt76_queue_entry *entry = &q->entry[q->head];
-	struct mt76_rxwi_cache *rxwi = NULL;
 	struct mt76_desc *desc;
 	int idx = q->head;
 	u32 buf1 = 0, ctrl;
@@ -249,9 +249,11 @@ mt76_dma_add_rx_buf(struct mt76_dev *dev, struct mt76_queue *q,
 #endif
 
 	if (mt76_queue_is_wed_rx(q)) {
-		rxwi = mt76_get_rxwi(dev);
-		if (!rxwi)
-			return -ENOMEM;
+		if (!rxwi) {
+			rxwi = mt76_get_rxwi(dev);
+			if (!rxwi)
+				return -ENOMEM;
+		}
 
 		rx_token = mt76_rx_token_consume(dev, data, rxwi, buf->addr);
 		if (rx_token < 0) {
@@ -421,7 +423,7 @@ mt76_dma_tx_cleanup(struct mt76_dev *dev, struct mt76_queue *q, bool flush)
 
 static void *
 mt76_dma_get_buf(struct mt76_dev *dev, struct mt76_queue *q, int idx,
-		 int *len, u32 *info, bool *more, bool *drop)
+		 int *len, u32 *info, bool *more, bool *drop, bool flush)
 {
 	struct mt76_queue_entry *e = &q->entry[idx];
 	struct mt76_desc *desc = &q->desc[idx];
@@ -478,11 +480,44 @@ mt76_dma_get_buf(struct mt76_dev *dev, struct mt76_queue *q, int idx,
 				 SKB_WITH_OVERHEAD(q->buf_size),
 				 DMA_FROM_DEVICE);
 
-		buf = r->ptr;
-		r->dma_addr = 0;
-		r->ptr = NULL;
+		if (flush) {
+			buf = r->ptr;
+			r->dma_addr = 0;
+			r->ptr = NULL;
+
+			mt76_put_rxwi(dev, r);
+		} else {
+			struct mt76_queue_buf qbuf;
+
+			buf = page_frag_alloc(&q->rx_page, q->buf_size, GFP_ATOMIC | GFP_DMA32);
+			if (!buf)
+				return NULL;
+
+			memcpy(buf, r->ptr, SKB_WITH_OVERHEAD(q->buf_size));
+
+			r->dma_addr = dma_map_single(dev->dma_dev, r->ptr,
+						     SKB_WITH_OVERHEAD(q->buf_size),
+						     DMA_FROM_DEVICE);
+			if (unlikely(dma_mapping_error(dev->dma_dev, r->dma_addr))) {
+				skb_free_frag(r->ptr);
+				mt76_put_rxwi(dev, r);
+				return NULL;
+			}
+
+			qbuf.addr = r->dma_addr;
+			qbuf.len = SKB_WITH_OVERHEAD(q->buf_size);
+			qbuf.skip_unmap = false;
+
+			if (mt76_dma_add_rx_buf(dev, q, &qbuf, r->ptr, r) < 0) {
+				dma_unmap_single(dev->dma_dev, r->dma_addr,
+						 SKB_WITH_OVERHEAD(q->buf_size),
+						 DMA_FROM_DEVICE);
+				skb_free_frag(r->ptr);
+				mt76_put_rxwi(dev, r);
+				return NULL;
+			}
+		}
 
-		mt76_put_rxwi(dev, r);
 		if (drop)
 			*drop |= !!(buf1 & MT_DMA_CTL_WO_DROP);
 	} else {
@@ -519,7 +554,7 @@ mt76_dma_dequeue(struct mt76_dev *dev, struct mt76_queue *q, bool flush,
 	q->tail = (q->tail + 1) % q->ndesc;
 	q->queued--;
 
-	return mt76_dma_get_buf(dev, q, idx, len, info, more, drop);
+	return mt76_dma_get_buf(dev, q, idx, len, info, more, drop, flush);
 }
 
 static int
@@ -685,7 +720,7 @@ int mt76_dma_rx_fill(struct mt76_dev *dev, struct mt76_queue *q)
 done:
 		qbuf.len = len - offset;
 		qbuf.skip_unmap = false;
-		if (mt76_dma_add_rx_buf(dev, q, &qbuf, buf) < 0) {
+		if (mt76_dma_add_rx_buf(dev, q, &qbuf, buf, NULL) < 0) {
 			dma_unmap_single(dev->dma_dev, addr, len,
 					 DMA_FROM_DEVICE);
 			skb_free_frag(buf);
@@ -786,12 +821,14 @@ mt76_dma_rx_cleanup(struct mt76_dev *dev, struct mt76_queue *q)
 
 	spin_unlock_bh(&q->lock);
 
-	if (!q->rx_page.va)
-		return;
+	if (FIELD_GET(MT_QFLAG_WED_TYPE, q->flags) != MT76_WED_Q_RX) {
+		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));
+		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
diff --git a/wed.c b/wed.c
index c03b52f..70e4057 100644
--- a/wed.c
+++ b/wed.c
@@ -9,12 +9,9 @@
 void mt76_wed_release_rx_buf(struct mtk_wed_device *wed)
 {
 	struct mt76_dev *dev = container_of(wed, struct mt76_dev, mmio.wed);
-	u32 length;
+	struct page *page;
 	int i;
 
-	length = SKB_DATA_ALIGN(NET_SKB_PAD + wed->wlan.rx_size +
-				sizeof(struct skb_shared_info));
-
 	for (i = 0; i < dev->rx_token_size; i++) {
 		struct mt76_rxwi_cache *r;
 
@@ -24,13 +21,33 @@ void mt76_wed_release_rx_buf(struct mtk_wed_device *wed)
 
 		dma_unmap_single(dev->dma_dev, r->dma_addr,
 				 wed->wlan.rx_size, DMA_FROM_DEVICE);
-		__free_pages(virt_to_page(r->ptr), get_order(length));
+		skb_free_frag(r->ptr);
 		r->ptr = NULL;
 
 		mt76_put_rxwi(dev, r);
 	}
 
 	mt76_free_pending_rxwi(dev);
+
+	mt76_for_each_q_rx(dev, i) {
+		struct mt76_queue *q = &dev->q_rx[i];
+
+		if (mt76_queue_is_wed_rx(q)) {
+			if (!q->rx_page.va)
+				continue;
+
+			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));
+		}
+	}
+
+	if (!wed->rx_buf_ring.rx_page.va)
+		return;
+
+	page = virt_to_page(wed->rx_buf_ring.rx_page.va);
+	__page_frag_cache_drain(page, wed->rx_buf_ring.rx_page.pagecnt_bias);
+	memset(&wed->rx_buf_ring.rx_page, 0, sizeof(wed->rx_buf_ring.rx_page));
 }
 EXPORT_SYMBOL_GPL(mt76_wed_release_rx_buf);
 
@@ -48,25 +65,23 @@ u32 mt76_wed_init_rx_buf(struct mtk_wed_device *wed, int size)
 	for (i = 0; i < size; i++) {
 		struct mt76_rxwi_cache *r = mt76_get_rxwi(dev);
 		dma_addr_t phy_addr;
-		struct page *page;
 		int token;
 		void *ptr;
 
 		if (!r)
 			goto unmap;
 
-		page = __dev_alloc_pages(GFP_KERNEL, get_order(length));
-		if (!page) {
+		ptr = page_frag_alloc(&wed->rx_buf_ring.rx_page, length, GFP_ATOMIC);
+		if (!ptr) {
 			mt76_put_rxwi(dev, r);
 			goto unmap;
 		}
 
-		ptr = page_address(page);
 		phy_addr = dma_map_single(dev->dma_dev, ptr,
 					  wed->wlan.rx_size,
 					  DMA_TO_DEVICE);
 		if (unlikely(dma_mapping_error(dev->dev, phy_addr))) {
-			__free_pages(page, get_order(length));
+			skb_free_frag(ptr);
 			mt76_put_rxwi(dev, r);
 			goto unmap;
 		}
@@ -76,7 +91,7 @@ u32 mt76_wed_init_rx_buf(struct mtk_wed_device *wed, int size)
 		if (token < 0) {
 			dma_unmap_single(dev->dma_dev, phy_addr,
 					 wed->wlan.rx_size, DMA_TO_DEVICE);
-			__free_pages(page, get_order(length));
+			skb_free_frag(ptr);
 			mt76_put_rxwi(dev, r);
 			goto unmap;
 		}
-- 
2.18.0