diff mbox series

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

Message ID 20240206091909.3191-5-paul.barker.ct@bp.renesas.com (mailing list archive)
State RFC
Delegated to: Netdev Maintainers
Headers show
Series Improve GbEth performance on Renesas RZ/G2L and related SoCs | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for net-next
netdev/apply fail Patch does not apply to net-next

Commit Message

Paul Barker Feb. 6, 2024, 9:19 a.m. UTC 
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@bp.renesas.com>
---
 drivers/net/ethernet/renesas/ravb_main.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

Comments

Sergey Shtylyov Feb. 10, 2024, 4:46 p.m. UTC | #1 
On 2/6/24 12:19 PM, Paul Barker wrote:

> 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@bp.renesas.com>

   Definitely looks like a bug fix...

[...]

MBR, Sergey
diff mbox series

Patch

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;
 }