bnxt_en: Use the unified RX page pool buffers for XDP and non-XDP

Convert to use the page pool buffers for the aggregation ring when
running in non-XDP mode.  This simplifies the driver and we benefit
from the recycling of pages.  Adjust the page pool size to account
for the aggregation ring size.

Signed-off-by: Somnath Kotur <somnath.kotur@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20230817231911.165035-2-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -877,48 +877,15 @@ static inline int bnxt_alloc_rx_page(struct bnxt *bp,
 	struct rx_bd *rxbd =
 		&rxr->rx_agg_desc_ring[RX_RING(prod)][RX_IDX(prod)];
 	struct bnxt_sw_rx_agg_bd *rx_agg_buf;
-	struct pci_dev *pdev = bp->pdev;
 	struct page *page;
 	dma_addr_t mapping;
 	u16 sw_prod = rxr->rx_sw_agg_prod;
 	unsigned int offset = 0;
 
-	if (BNXT_RX_PAGE_MODE(bp)) {
-		page = __bnxt_alloc_rx_page(bp, &mapping, rxr, &offset, gfp);
-
-		if (!page)
-			return -ENOMEM;
-
-	} else {
-		if (PAGE_SIZE > BNXT_RX_PAGE_SIZE) {
-			page = rxr->rx_page;
-			if (!page) {
-				page = alloc_page(gfp);
-				if (!page)
-					return -ENOMEM;
-				rxr->rx_page = page;
-				rxr->rx_page_offset = 0;
-			}
-			offset = rxr->rx_page_offset;
-			rxr->rx_page_offset += BNXT_RX_PAGE_SIZE;
-			if (rxr->rx_page_offset == PAGE_SIZE)
-				rxr->rx_page = NULL;
-			else
-				get_page(page);
-		} else {
-			page = alloc_page(gfp);
-			if (!page)
-				return -ENOMEM;
-		}
+	page = __bnxt_alloc_rx_page(bp, &mapping, rxr, &offset, gfp);
 
-		mapping = dma_map_page_attrs(&pdev->dev, page, offset,
-					     BNXT_RX_PAGE_SIZE, DMA_FROM_DEVICE,
-					     DMA_ATTR_WEAK_ORDERING);
-		if (dma_mapping_error(&pdev->dev, mapping)) {
-			__free_page(page);
-			return -EIO;
-		}
-	}
+	if (!page)
+		return -ENOMEM;
 
 	if (unlikely(test_bit(sw_prod, rxr->rx_agg_bmap)))
 		sw_prod = bnxt_find_next_agg_idx(rxr, sw_prod);
@@ -1204,6 +1171,7 @@ static struct sk_buff *bnxt_rx_agg_pages_skb(struct bnxt *bp,
 	total_frag_len = __bnxt_rx_agg_pages(bp, cpr, shinfo, idx,
 					     agg_bufs, tpa, NULL);
 	if (!total_frag_len) {
+		skb_mark_for_recycle(skb);
 		dev_kfree_skb(skb);
 		return NULL;
 	}
@@ -1794,6 +1762,7 @@ static void bnxt_deliver_skb(struct bnxt *bp, struct bnxt_napi *bnapi,
 		return;
 	}
 	skb_record_rx_queue(skb, bnapi->index);
+	skb_mark_for_recycle(skb);
 	napi_gro_receive(&bnapi->napi, skb);
 }
 
@@ -3002,30 +2971,16 @@ static void bnxt_free_one_rx_ring_skbs(struct bnxt *bp, int ring_nr)
 		if (!page)
 			continue;
 
-		if (BNXT_RX_PAGE_MODE(bp)) {
-			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);
-
-			page_pool_recycle_direct(rxr->page_pool, page);
-		} else {
-			dma_unmap_page_attrs(&pdev->dev, rx_agg_buf->mapping,
-					     BNXT_RX_PAGE_SIZE, DMA_FROM_DEVICE,
-					     DMA_ATTR_WEAK_ORDERING);
-			rx_agg_buf->page = NULL;
-			__clear_bit(i, rxr->rx_agg_bmap);
+		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);
 
-			__free_page(page);
-		}
+		page_pool_recycle_direct(rxr->page_pool, page);
 	}
 
 skip_rx_agg_free:
-	if (rxr->rx_page) {
-		__free_page(rxr->rx_page);
-		rxr->rx_page = NULL;
-	}
 	map = rxr->rx_tpa_idx_map;
 	if (map)
 		memset(map->agg_idx_bmap, 0, sizeof(map->agg_idx_bmap));
@@ -3244,7 +3199,9 @@ static int bnxt_alloc_rx_page_pool(struct bnxt *bp,
 {
 	struct page_pool_params pp = { 0 };
 
-	pp.pool_size = bp->rx_ring_size;
+	pp.pool_size = bp->rx_agg_ring_size;
+	if (BNXT_RX_PAGE_MODE(bp))
+		pp.pool_size += bp->rx_ring_size;
 	pp.nid = dev_to_node(&bp->pdev->dev);
 	pp.napi = &rxr->bnapi->napi;
 	pp.dev = &bp->pdev->dev;

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -919,9 +919,6 @@ struct bnxt_rx_ring_info {
 	unsigned long		*rx_agg_bmap;
 	u16			rx_agg_bmap_size;
 
-	struct page		*rx_page;
-	unsigned int		rx_page_offset;
-
 	dma_addr_t		rx_desc_mapping[MAX_RX_PAGES];
 	dma_addr_t		rx_agg_desc_mapping[MAX_RX_AGG_PAGES];