From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762877AbZD2Whq (ORCPT ); Wed, 29 Apr 2009 18:37:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759475AbZD2WVr (ORCPT ); Wed, 29 Apr 2009 18:21:47 -0400 Received: from kroah.org ([198.145.64.141]:40532 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759760AbZD2WVn (ORCPT ); Wed, 29 Apr 2009 18:21:43 -0400 X-Mailbox-Line: From gregkh@mini.kroah.org Wed Apr 29 15:09:29 2009 Message-Id: <20090429220929.295259303@mini.kroah.org> User-Agent: quilt/0.48-1 Date: Wed, 29 Apr 2009 15:07:41 -0700 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org, Greg KH Cc: Justin Forbes , Zwane Mwaikambo , "Theodore Ts'o" , Randy Dunlap , Dave Jones , Chuck Wolber , Chris Wedgwood , Michael Krufky , Chuck Ebbert , Domenico Andreoli , Willy Tarreau , Rodrigo Rubira Branco , Jake Edge , Eugene Teo , torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Ivan Vecera , Francois Romieu , "David S. Miller" Subject: [patch 42/58] r8169: Dont update statistics counters when interface is down References: <20090429220659.339950874@mini.kroah.org> Content-Disposition: inline; filename=r8169-don-t-update-statistics-counters-when-interface-is-down.patch In-Reply-To: <20090429221657.GA11765@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.27-stable review patch. If anyone has any objections, please let us know. ------------------ From: Francois Romieu Upstream as 355423d0849f4506bc71ab2738d38cb74429aaef (post 2.6.28). Some Realtek chips (RTL8169sb/8110sb in my case) are unable to retrieve ethtool statistics when the interface is down. The process stays in endless loop in rtl8169_get_ethtool_stats. This is because these chips need to have receiver enabled (CmdRxEnb bit in ChipCmd register) that is cleared when the interface is going down. It's better to update statistics only when the interface is up and otherwise return copy of statistics grabbed when the interface was up (in rtl8169_close). It is interesting that PCI-E NICs (like 8168b/8111b...) are not affected. Signed-off-by: Ivan Vecera Acked-by: Francois Romieu Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/r8169.c | 93 ++++++++++++++++++++++++++++++++-------------------- 1 file changed, 58 insertions(+), 35 deletions(-) --- a/drivers/net/r8169.c +++ b/drivers/net/r8169.c @@ -375,6 +375,22 @@ enum features { RTL_FEATURE_GMII = (1 << 2), }; +struct rtl8169_counters { + __le64 tx_packets; + __le64 rx_packets; + __le64 tx_errors; + __le32 rx_errors; + __le16 rx_missed; + __le16 align_errors; + __le32 tx_one_collision; + __le32 tx_multi_collision; + __le64 rx_unicast; + __le64 rx_broadcast; + __le32 rx_multicast; + __le16 tx_aborted; + __le16 tx_underun; +}; + struct rtl8169_private { void __iomem *mmio_addr; /* memory map physical address */ struct pci_dev *pci_dev; /* Index of PCI device */ @@ -416,6 +432,7 @@ struct rtl8169_private { unsigned features; struct mii_if_info mii; + struct rtl8169_counters counters; }; MODULE_AUTHOR("Realtek and the Linux r8169 crew "); @@ -960,22 +977,6 @@ static const char rtl8169_gstrings[][ETH "tx_underrun", }; -struct rtl8169_counters { - __le64 tx_packets; - __le64 rx_packets; - __le64 tx_errors; - __le32 rx_errors; - __le16 rx_missed; - __le16 align_errors; - __le32 tx_one_collision; - __le32 tx_multi_collision; - __le64 rx_unicast; - __le64 rx_broadcast; - __le32 rx_multicast; - __le16 tx_aborted; - __le16 tx_underun; -}; - static int rtl8169_get_sset_count(struct net_device *dev, int sset) { switch (sset) { @@ -986,16 +987,21 @@ static int rtl8169_get_sset_count(struct } } -static void rtl8169_get_ethtool_stats(struct net_device *dev, - struct ethtool_stats *stats, u64 *data) +static void rtl8169_update_counters(struct net_device *dev) { struct rtl8169_private *tp = netdev_priv(dev); void __iomem *ioaddr = tp->mmio_addr; struct rtl8169_counters *counters; dma_addr_t paddr; u32 cmd; + int wait = 1000; - ASSERT_RTNL(); + /* + * Some chips are unable to dump tally counters when the receiver + * is disabled. + */ + if ((RTL_R8(ChipCmd) & CmdRxEnb) == 0) + return; counters = pci_alloc_consistent(tp->pci_dev, sizeof(*counters), &paddr); if (!counters) @@ -1006,31 +1012,45 @@ static void rtl8169_get_ethtool_stats(st RTL_W32(CounterAddrLow, cmd); RTL_W32(CounterAddrLow, cmd | CounterDump); - while (RTL_R32(CounterAddrLow) & CounterDump) { - if (msleep_interruptible(1)) + while (wait--) { + if ((RTL_R32(CounterAddrLow) & CounterDump) == 0) { + /* copy updated counters */ + memcpy(&tp->counters, counters, sizeof(*counters)); break; + } + udelay(10); } RTL_W32(CounterAddrLow, 0); RTL_W32(CounterAddrHigh, 0); - data[0] = le64_to_cpu(counters->tx_packets); - data[1] = le64_to_cpu(counters->rx_packets); - data[2] = le64_to_cpu(counters->tx_errors); - data[3] = le32_to_cpu(counters->rx_errors); - data[4] = le16_to_cpu(counters->rx_missed); - data[5] = le16_to_cpu(counters->align_errors); - data[6] = le32_to_cpu(counters->tx_one_collision); - data[7] = le32_to_cpu(counters->tx_multi_collision); - data[8] = le64_to_cpu(counters->rx_unicast); - data[9] = le64_to_cpu(counters->rx_broadcast); - data[10] = le32_to_cpu(counters->rx_multicast); - data[11] = le16_to_cpu(counters->tx_aborted); - data[12] = le16_to_cpu(counters->tx_underun); - pci_free_consistent(tp->pci_dev, sizeof(*counters), counters, paddr); } +static void rtl8169_get_ethtool_stats(struct net_device *dev, + struct ethtool_stats *stats, u64 *data) +{ + struct rtl8169_private *tp = netdev_priv(dev); + + ASSERT_RTNL(); + + rtl8169_update_counters(dev); + + data[0] = le64_to_cpu(tp->counters.tx_packets); + data[1] = le64_to_cpu(tp->counters.rx_packets); + data[2] = le64_to_cpu(tp->counters.tx_errors); + data[3] = le32_to_cpu(tp->counters.rx_errors); + data[4] = le16_to_cpu(tp->counters.rx_missed); + data[5] = le16_to_cpu(tp->counters.align_errors); + data[6] = le32_to_cpu(tp->counters.tx_one_collision); + data[7] = le32_to_cpu(tp->counters.tx_multi_collision); + data[8] = le64_to_cpu(tp->counters.rx_unicast); + data[9] = le64_to_cpu(tp->counters.rx_broadcast); + data[10] = le32_to_cpu(tp->counters.rx_multicast); + data[11] = le16_to_cpu(tp->counters.tx_aborted); + data[12] = le16_to_cpu(tp->counters.tx_underun); +} + static void rtl8169_get_strings(struct net_device *dev, u32 stringset, u8 *data) { switch(stringset) { @@ -2979,6 +2999,9 @@ static int rtl8169_close(struct net_devi struct rtl8169_private *tp = netdev_priv(dev); struct pci_dev *pdev = tp->pci_dev; + /* update counters before going down */ + rtl8169_update_counters(dev); + rtl8169_down(dev); free_irq(dev->irq, dev);