netdev - [PATCH net-next 3/3] bnxt_en: Let the page pool manage the DMA mapping

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Date: Fri, 28 Jul 2023 16:18:29 -0700
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	gospo@...adcom.com,
	bpf@...r.kernel.org,
	somnath.kotur@...adcom.com
Subject: [PATCH net-next 3/3] bnxt_en: Let the page pool manage the DMA mapping

From: Somnath Kotur <somnath.kotur@...adcom.com>

Use the page pool's ability to maintain DMA mappings for us.
This avoids re-mapping of the recycled pages.

Signed-off-by: Somnath Kotur <somnath.kotur@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 32 +++++++----------------
 1 file changed, 10 insertions(+), 22 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index adf785b7aa42..b35bc92094ce 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -759,7 +759,6 @@ static struct page *__bnxt_alloc_rx_page(struct bnxt *bp, dma_addr_t *mapping,
 					 unsigned int *offset,
 					 gfp_t gfp)
 {
-	struct device *dev = &bp->pdev->dev;
 	struct page *page;
 
 	if (PAGE_SIZE > BNXT_RX_PAGE_SIZE) {
@@ -772,12 +771,7 @@ static struct page *__bnxt_alloc_rx_page(struct bnxt *bp, dma_addr_t *mapping,
 	if (!page)
 		return NULL;
 
-	*mapping = dma_map_page_attrs(dev, page, *offset, BNXT_RX_PAGE_SIZE,
-				      bp->rx_dir, DMA_ATTR_WEAK_ORDERING);
-	if (dma_mapping_error(dev, *mapping)) {
-		page_pool_recycle_direct(rxr->page_pool, page);
-		return NULL;
-	}
+	*mapping = page_pool_get_dma_addr(page) + *offset;
 	return page;
 }
 
@@ -996,8 +990,8 @@ static struct sk_buff *bnxt_rx_multi_page_skb(struct bnxt *bp,
 		return NULL;
 	}
 	dma_addr -= bp->rx_dma_offset;
-	dma_unmap_page_attrs(&bp->pdev->dev, dma_addr, BNXT_RX_PAGE_SIZE, bp->rx_dir,
-			     DMA_ATTR_WEAK_ORDERING);
+	dma_sync_single_for_cpu(&bp->pdev->dev, dma_addr, BNXT_RX_PAGE_SIZE,
+				bp->rx_dir);
 	skb = build_skb(data_ptr - bp->rx_offset, BNXT_RX_PAGE_SIZE);
 	if (!skb) {
 		page_pool_recycle_direct(rxr->page_pool, page);
@@ -1030,8 +1024,8 @@ static struct sk_buff *bnxt_rx_page_skb(struct bnxt *bp,
 		return NULL;
 	}
 	dma_addr -= bp->rx_dma_offset;
-	dma_unmap_page_attrs(&bp->pdev->dev, dma_addr, BNXT_RX_PAGE_SIZE, bp->rx_dir,
-			     DMA_ATTR_WEAK_ORDERING);
+	dma_sync_single_for_cpu(&bp->pdev->dev, dma_addr, BNXT_RX_PAGE_SIZE,
+				bp->rx_dir);
 
 	if (unlikely(!payload))
 		payload = eth_get_headlen(bp->dev, data_ptr, len);
@@ -1147,9 +1141,8 @@ static u32 __bnxt_rx_agg_pages(struct bnxt *bp,
 			return 0;
 		}
 
-		dma_unmap_page_attrs(&pdev->dev, mapping, BNXT_RX_PAGE_SIZE,
-				     bp->rx_dir,
-				     DMA_ATTR_WEAK_ORDERING);
+		dma_sync_single_for_cpu(&pdev->dev, mapping, BNXT_RX_PAGE_SIZE,
+					bp->rx_dir);
 
 		total_frag_len += frag_len;
 		prod = NEXT_RX_AGG(prod);
@@ -2945,10 +2938,6 @@ static void bnxt_free_one_rx_ring_skbs(struct bnxt *bp, int ring_nr)
 
 		rx_buf->data = NULL;
 		if (BNXT_RX_PAGE_MODE(bp)) {
-			mapping -= bp->rx_dma_offset;
-			dma_unmap_page_attrs(&pdev->dev, mapping, BNXT_RX_PAGE_SIZE,
-					     bp->rx_dir,
-					     DMA_ATTR_WEAK_ORDERING);
 			page_pool_recycle_direct(rxr->page_pool, data);
 		} else {
 			dma_unmap_single_attrs(&pdev->dev, mapping,
@@ -2969,9 +2958,6 @@ static void bnxt_free_one_rx_ring_skbs(struct bnxt *bp, int ring_nr)
 		if (!page)
 			continue;
 
-		dma_unmap_page_attrs(&pdev->dev, rx_agg_buf->mapping,
-				     BNXT_RX_PAGE_SIZE, bp->rx_dir,
-				     DMA_ATTR_WEAK_ORDERING);
 		rx_agg_buf->page = NULL;
 		__clear_bit(i, rxr->rx_agg_bmap);
 
@@ -3203,7 +3189,9 @@ static int bnxt_alloc_rx_page_pool(struct bnxt *bp,
 	pp.nid = dev_to_node(&bp->pdev->dev);
 	pp.napi = &rxr->bnapi->napi;
 	pp.dev = &bp->pdev->dev;
-	pp.dma_dir = DMA_BIDIRECTIONAL;
+	pp.dma_dir = bp->rx_dir;
+	pp.max_len = BNXT_RX_PAGE_SIZE;
+	pp.flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV;
 	if (PAGE_SIZE > BNXT_RX_PAGE_SIZE)
 		pp.flags |= PP_FLAG_PAGE_FRAG;
 
-- 
2.30.1


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