linux-kernel - [RFC PATCH net-next v2 4/7] net: ravb: Always update error counters

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Message-Id: <20240206091909.3191-5-paul.barker.ct@bp.renesas.com>
Date: Tue,  6 Feb 2024 09:19:06 +0000
From: Paul Barker <paul.barker.ct@...renesas.com>
To: Sergey Shtylyov <s.shtylyov@....ru>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Paul Barker <paul.barker.ct@...renesas.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	netdev@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH net-next v2 4/7] net: ravb: Always update error counters

The error statistics should be updated each time the poll function is
called, even if the full RX work budget has been consumed. This prevents
the counts from becoming stuck when RX bandwidth usage is high.

This also ensures that error counters are not updated after we've
re-enabled interrupts as that could result in a race condition.

Also drop an unnecessary space.

Signed-off-by: Paul Barker <paul.barker.ct@...renesas.com>
---
 drivers/net/ethernet/renesas/ravb_main.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 10f11141569f..2136600d60dd 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -1358,6 +1358,15 @@ static int ravb_poll(struct napi_struct *napi, int budget)
 	netif_wake_subqueue(ndev, q);
 	spin_unlock_irqrestore(&priv->lock, flags);
 
+	/* Receive error message handling */
+	priv->rx_over_errors = priv->stats[RAVB_BE].rx_over_errors;
+	if (info->nc_queues)
+		priv->rx_over_errors += priv->stats[RAVB_NC].rx_over_errors;
+	if (priv->rx_over_errors != ndev->stats.rx_over_errors)
+		ndev->stats.rx_over_errors = priv->rx_over_errors;
+	if (priv->rx_fifo_errors != ndev->stats.rx_fifo_errors)
+		ndev->stats.rx_fifo_errors = priv->rx_fifo_errors;
+
 	if (work_done == budget)
 		goto out;
 
@@ -1374,14 +1383,6 @@ static int ravb_poll(struct napi_struct *napi, int budget)
 	}
 	spin_unlock_irqrestore(&priv->lock, flags);
 
-	/* Receive error message handling */
-	priv->rx_over_errors =  priv->stats[RAVB_BE].rx_over_errors;
-	if (info->nc_queues)
-		priv->rx_over_errors += priv->stats[RAVB_NC].rx_over_errors;
-	if (priv->rx_over_errors != ndev->stats.rx_over_errors)
-		ndev->stats.rx_over_errors = priv->rx_over_errors;
-	if (priv->rx_fifo_errors != ndev->stats.rx_fifo_errors)
-		ndev->stats.rx_fifo_errors = priv->rx_fifo_errors;
 out:
 	return work_done;
 }
-- 
2.39.2