netdev - [PATCH net-next 12/15] eth: fbnic: allocate unreadable page pool for the payloads

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Message-ID: <20250820025704.166248-13-kuba@kernel.org>
Date: Tue, 19 Aug 2025 19:57:01 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	pabeni@...hat.com,
	andrew+netdev@...n.ch,
	horms@...nel.org,
	almasrymina@...gle.com,
	michael.chan@...adcom.com,
	tariqt@...dia.com,
	dtatulea@...dia.com,
	hawk@...nel.org,
	ilias.apalodimas@...aro.org,
	alexanderduyck@...com,
	sdf@...ichev.me,
	Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next 12/15] eth: fbnic: allocate unreadable page pool for the payloads

Allow allocating a page pool with unreadable memory for the payload
ring (sub1). We need to provide the queue ID so that the memory provider
can match the PP, and use the appropriate page pool DMA sync helper.
While at it remove the define for page pool flags.

The rxq_idx is passed to fbnic_alloc_rx_qt_resources() explicitly
to make it easy to allocate page pools without NAPI (see the patch
after the next).

Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
 drivers/net/ethernet/meta/fbnic/fbnic_txrx.c | 31 +++++++++++++-------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c b/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c
index 7694b25ef77d..44d9f1598820 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c
@@ -997,9 +997,8 @@ static void fbnic_add_rx_frag(struct fbnic_napi_vector *nv, u64 rcd,
 		  FBNIC_BD_FRAG_SIZE;
 
 	/* Sync DMA buffer */
-	dma_sync_single_range_for_cpu(nv->dev,
-				      page_pool_get_dma_addr_netmem(netmem),
-				      pg_off, truesize, DMA_BIDIRECTIONAL);
+	page_pool_dma_sync_netmem_for_cpu(qt->sub1.page_pool, netmem,
+					  pg_off, truesize);
 
 	added = xdp_buff_add_frag(&pkt->buff, netmem, pg_off, len, truesize);
 	if (unlikely(!added)) {
@@ -1515,16 +1514,14 @@ void fbnic_free_napi_vectors(struct fbnic_net *fbn)
 			fbnic_free_napi_vector(fbn, fbn->napi[i]);
 }
 
-#define FBNIC_PAGE_POOL_FLAGS \
-	(PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV)
-
 static int
 fbnic_alloc_qt_page_pools(struct fbnic_net *fbn, struct fbnic_napi_vector *nv,
-			  struct fbnic_q_triad *qt)
+			  struct fbnic_q_triad *qt, unsigned int rxq_idx)
 {
 	struct page_pool_params pp_params = {
 		.order = 0,
-		.flags = FBNIC_PAGE_POOL_FLAGS,
+		.flags = PP_FLAG_DMA_MAP |
+			 PP_FLAG_DMA_SYNC_DEV,
 		.pool_size = fbn->hpq_size + fbn->ppq_size,
 		.nid = NUMA_NO_NODE,
 		.dev = nv->dev,
@@ -1533,6 +1530,7 @@ fbnic_alloc_qt_page_pools(struct fbnic_net *fbn, struct fbnic_napi_vector *nv,
 		.max_len = PAGE_SIZE,
 		.napi	= &nv->napi,
 		.netdev	= fbn->netdev,
+		.queue_idx = rxq_idx,
 	};
 	struct page_pool *pp;
 
@@ -1553,10 +1551,23 @@ fbnic_alloc_qt_page_pools(struct fbnic_net *fbn, struct fbnic_napi_vector *nv,
 		return PTR_ERR(pp);
 
 	qt->sub0.page_pool = pp;
-	page_pool_get(pp);
+	if (page_pool_rxq_wants_unreadable(&pp_params)) {
+		pp_params.flags |= PP_FLAG_ALLOW_UNREADABLE_NETMEM;
+		pp_params.dma_dir = DMA_FROM_DEVICE;
+
+		pp = page_pool_create(&pp_params);
+		if (IS_ERR(pp))
+			goto err_destroy_sub0;
+	} else {
+		page_pool_get(pp);
+	}
 	qt->sub1.page_pool = pp;
 
 	return 0;
+
+err_destroy_sub0:
+	page_pool_destroy(pp);
+	return PTR_ERR(pp);
 }
 
 static void fbnic_ring_init(struct fbnic_ring *ring, u32 __iomem *doorbell,
@@ -1961,7 +1972,7 @@ static int fbnic_alloc_rx_qt_resources(struct fbnic_net *fbn,
 	struct device *dev = fbn->netdev->dev.parent;
 	int err;
 
-	err = fbnic_alloc_qt_page_pools(fbn, nv, qt);
+	err = fbnic_alloc_qt_page_pools(fbn, nv, qt, qt->cmpl.q_idx);
 	if (err)
 		return err;
 
-- 
2.50.1