linux-kernel - [PATCH net-next] gve: Modify rx_buf_alloc_fail counter centrally and closer to failure

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Date: Wed, 24 Jan 2024 20:54:35 +0000
From: nktgrg <nktgrg@...gle.com>
To: netdev@...r.kernel.org, jeroendb@...gle.com, pkaligineedi@...gle.com, 
	shailend@...gle.com, davem@...emloft.net, edumazet@...gle.com, 
	kuba@...nel.org, pabeni@...hat.com, jfraker@...gle.com, 
	linux-kernel@...r.kernel.org
Cc: stable@...nel.org, Ankit Garg <nktgrg@...gle.com>
Subject: [PATCH net-next] gve: Modify rx_buf_alloc_fail counter centrally and
 closer to failure

From: Ankit Garg <nktgrg@...gle.com>

Previously, each caller of gve_rx_alloc_buffer had to increase counter
 and as a result one caller was not tracking those failure. Increasing
 counters at a common location now so callers don't have to duplicate
 code or miss counter management.

Signed-off-by: Ankit Garg <nktgrg@...gle.com>
---
 drivers/net/ethernet/google/gve/gve_rx.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/google/gve/gve_rx.c b/drivers/net/ethernet/google/gve/gve_rx.c
index 3cb3a9a..eb67ea9 100644
--- a/drivers/net/ethernet/google/gve/gve_rx.c
+++ b/drivers/net/ethernet/google/gve/gve_rx.c
@@ -93,7 +93,8 @@ static void gve_setup_rx_buffer(struct gve_rx_slot_page_info *page_info,
 
 static int gve_rx_alloc_buffer(struct gve_priv *priv, struct device *dev,
 			       struct gve_rx_slot_page_info *page_info,
-			       union gve_rx_data_slot *data_slot)
+			       union gve_rx_data_slot *data_slot,
+			       struct gve_rx_ring *rx)
 {
 	struct page *page;
 	dma_addr_t dma;
@@ -101,8 +102,12 @@ static int gve_rx_alloc_buffer(struct gve_priv *priv, struct device *dev,
 
 	err = gve_alloc_page(priv, dev, &page, &dma, DMA_FROM_DEVICE,
 			     GFP_ATOMIC);
-	if (err)
+	if (err) {
+		u64_stats_update_begin(&rx->statss);
+		rx->rx_buf_alloc_fail++;
+		u64_stats_update_end(&rx->statss);
 		return err;
+	}
 
 	gve_setup_rx_buffer(page_info, dma, page, &data_slot->addr);
 	return 0;
@@ -143,8 +148,9 @@ static int gve_prefill_rx_pages(struct gve_rx_ring *rx)
 					    &rx->data.data_ring[i].qpl_offset);
 			continue;
 		}
-		err = gve_rx_alloc_buffer(priv, &priv->pdev->dev, &rx->data.page_info[i],
-					  &rx->data.data_ring[i]);
+		err = gve_rx_alloc_buffer(priv, &priv->pdev->dev,
+					  &rx->data.page_info[i],
+					  &rx->data.data_ring[i], rx);
 		if (err)
 			goto alloc_err_rda;
 	}
@@ -895,10 +901,7 @@ static bool gve_rx_refill_buffers(struct gve_priv *priv, struct gve_rx_ring *rx)
 				gve_rx_free_buffer(dev, page_info, data_slot);
 				page_info->page = NULL;
 				if (gve_rx_alloc_buffer(priv, dev, page_info,
-							data_slot)) {
-					u64_stats_update_begin(&rx->statss);
-					rx->rx_buf_alloc_fail++;
-					u64_stats_update_end(&rx->statss);
+							data_slot, rx)) {
 					break;
 				}
 			}
-- 
2.43.0.429.g432eaa2c6b-goog