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[PATCH net v3] r8169:fix "rtl_counters_cond == 1 (loop: 1000, delay: 10)" log spam.

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  [PATCH net v3] r8169:fix "rtl_counters_cond == 1 (loop: 1000, delay: 10)" log spam. Chunhao Lin <hau@realtek.com> - 2016-02-23 09:30 +0100
    Re: [PATCH net v3] r8169:fix "rtl_counters_cond == 1 (loop: 1000,  delay: 10)" log spam. Francois Romieu <romieu@fr.zoreil.com> - 2016-02-23 23:50 +0100

#1340392 — [PATCH net v3] r8169:fix "rtl_counters_cond == 1 (loop: 1000, delay: 10)" log spam.

There will be a log spam when there is no cable plugged.
Please refer to following links.
https://bugzilla.kernel.org/show_bug.cgi?id=104351
https://bugzilla.kernel.org/show_bug.cgi?id=107421

This issue is caused by runtime power management. When there is no cable plugged, the driver will be suspend (runtime suspend) by OS and NIC will be put into the D3 state. During this time, if OS call rtl8169_get_stats64() to dump tally counter, because NIC is in D3 state, the register value read by driver will return all 0xff. This will let driver think tally counter flag is not toggled and then sends the warning  message "rtl_counters_cond == 1 (loop: 1000,
delay: 10)" to kernel log.

For fixing this issue,
1.add checking driver's pm runtime status in rtl8169_get_stats64().
2.dump tally counter before going runtime suspend for counter accuracy in
  runtime suspend.

Signed-off-by: Chunhao Lin <hau@realtek.com>
---
 drivers/net/ethernet/realtek/r8169.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 537974c..404be51 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 rtl8169_counters *counters = tp->counters;
 	unsigned int start;
 
-	if (netif_running(dev))
+	pm_runtime_get_noresume(&pdev->dev);
+
+	if (netif_running(dev) && pm_runtime_active(&pdev->dev))
 		rtl8169_rx_missed(dev, ioaddr);
 
 	do {
@@ -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);
 
 	/*
 	 * Subtract values fetched during initalization.
@@ -7774,6 +7778,8 @@ rtl8169_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 	stats->tx_aborted_errors = le16_to_cpu(counters->tx_aborted) -
 		le16_to_cpu(tp->tc_offset.tx_aborted);
 
+	pm_runtime_put_noidle(&pdev->dev);
+
 	return stats;
 }
 
@@ -7853,6 +7859,11 @@ static int rtl8169_runtime_suspend(struct device *device)
 
 	rtl8169_net_suspend(dev);
 
+	/* Update counters before going runtime suspend */
+	if (netif_running(dev))
+		rtl8169_rx_missed(dev, tp->mmio_addr);
+	rtl8169_update_counters(dev);
+
 	return 0;
 }
 
-- 
1.9.1

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#1341145 — Re: [PATCH net v3] r8169:fix "rtl_counters_cond == 1 (loop: 1000, delay: 10)" log spam.

Chunhao Lin <hau@realtek.com> :
[...]
> diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
> index 537974c..404be51 100644
> --- a/drivers/net/ethernet/realtek/r8169.c
> +++ b/drivers/net/ethernet/realtek/r8169.c
[...]
> @@ -7853,6 +7859,11 @@ static int rtl8169_runtime_suspend(struct device *device)
>  
>  	rtl8169_net_suspend(dev);
>  
> +	/* Update counters before going runtime suspend */
> +	if (netif_running(dev))

This test is useless (always true):

- rtl_open
  [...]
  pm_runtime_get_sync(&pdev->dev);
  [...]
  tp->TxDescArray = blah
  [...]

- rtl8169_close
  [...]
  pm_runtime_get_sync(&pdev->dev);
  [...]
  tp->TxDescArray = NULL;

- rtl8169_runtime_suspend
  [...]
  if (!tp->TxDescArray)
  	  return 0;

(the implicit smp barriers are mildly obvious, ok)

-- 
Ueimor

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