[PATCH net v2] r8169:fix "rtl_counters_cond == 1 (loop: 1000, delay: 10)" log spam.
From: Chunhao Lin <hidden>
Date: 2016-02-22 15:10:18
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Subsystem:
8169 10/100/1000 gigabit ethernet driver, networking drivers, the rest · Maintainers:
Heiner Kallweit, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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 <redacted> --- drivers/net/ethernet/realtek/r8169.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-)
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 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; }
@@ -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;
--
1.9.1