Thread (3 messages) flat view 3 messages, 2 authors, 2016-02-23

Re: [PATCH net v2] r8169:fix "rtl_counters_cond == 1 (loop: 1000, delay: 10)" log spam.

From: Francois Romieu <romieu@fr.zoreil.com>
Date: 2016-02-22 23:13:11
Also in: lkml

Chunhao Lin [off-list ref] :
[...]
quoted hunk ↗ jump to hunk
diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 537974c..a645f8d 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -7730,10 +7730,13 @@ rtl8169_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 {
 	struct rtl8169_private *tp = netdev_priv(dev);
 	void __iomem *ioaddr = tp->mmio_addr;
+	struct pci_dev *pdev = tp->pci_dev;
+ 	struct device *d = &tp->pci_dev->dev;

(the patch does not use pdev alone)

[...]
quoted hunk ↗ jump to hunk
@@ -7761,7 +7764,8 @@ rtl8169_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 	 * Fetch additonal counter values missing in stats collected by driver
 	 * from tally counters.
 	 */
-	rtl8169_update_counters(dev);
+	if (pm_runtime_active(&pdev->dev))
+		rtl8169_update_counters(dev);
pm_runtime_active() won't change after pm_runtime_get_noresume(). You may
set a boolean active = pm_runtime_active(d) before testing netif_running().

[...]
quoted hunk ↗ jump to hunk
@@ -7842,6 +7848,12 @@ static int rtl8169_runtime_suspend(struct device *device)
 	struct pci_dev *pdev = to_pci_dev(device);
 	struct net_device *dev = pci_get_drvdata(pdev);
 	struct rtl8169_private *tp = netdev_priv(dev);
+	void __iomem *ioaddr = tp->mmio_addr;
+
+	/* Update counters before going runtime suspend */
+	if (netif_running(dev))
+		rtl8169_rx_missed(dev, ioaddr);
+	rtl8169_update_counters(dev);
 
 	if (!tp->TxDescArray)
 		return 0;
Nits:

- the tp->TxDescArray test provides the required synchronization: see
  rtl8169_{open/close} and their pm_runtime_{get / put}.

- ioaddr is not really needed : tp->mmio_addr appears only once and it does
  not mess the 72..80 cols limit.

- even if the device can only be automatically runtime suspended some time
  after a link down event, you may address davem's point regarding stats
  reliability and move rtl8169_rx_missed + rtl8169_update_counters after
  rtl8169_net_suspend.

-- 
Ueimor
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