From 33bd9f601ea21c4389870e425ae4eaf210d49b95 Mon Sep 17 00:00:00 2001 From: Greg Rose Date: Fri, 19 Mar 2010 02:59:52 +0000 Subject: ixgbevf: Fix VF Stats accounting after reset The counters in the 82599 Virtual Function are not clear on read. They accumulate to the maximum value and then roll over. They are also not cleared when the VF executes a soft reset, so it is possible they are non-zero when the driver loads and starts. This has all been accounted for in the code that keeps the stats up to date but there is one case that is not. When the PF driver is reset the counters in the VF are all reset to zero. This adds an additional accounting overhead into the VF driver when the PF is reset under its feet. This patch adds additional counters that are used by the VF driver to accumulate and save stats after a PF reset has been detected. Prior to this patch displaying the stats in the VF after the PF has reset would show bogus data. Signed-off-by: Greg Rose Signed-off-by: Jeff Kirsher Signed-off-by: David S. Miller --- drivers/net/ixgbevf/ixgbevf_main.c | 68 ++++++++++++++++++++++++-------------- 1 file changed, 44 insertions(+), 24 deletions(-) (limited to 'drivers/net/ixgbevf/ixgbevf_main.c') diff --git a/drivers/net/ixgbevf/ixgbevf_main.c b/drivers/net/ixgbevf/ixgbevf_main.c index ca653c49b765..43927e1b3432 100644 --- a/drivers/net/ixgbevf/ixgbevf_main.c +++ b/drivers/net/ixgbevf/ixgbevf_main.c @@ -1610,6 +1610,44 @@ static inline void ixgbevf_rx_desc_queue_enable(struct ixgbevf_adapter *adapter, (adapter->rx_ring[rxr].count - 1)); } +static void ixgbevf_save_reset_stats(struct ixgbevf_adapter *adapter) +{ + /* Only save pre-reset stats if there are some */ + if (adapter->stats.vfgprc || adapter->stats.vfgptc) { + adapter->stats.saved_reset_vfgprc += adapter->stats.vfgprc - + adapter->stats.base_vfgprc; + adapter->stats.saved_reset_vfgptc += adapter->stats.vfgptc - + adapter->stats.base_vfgptc; + adapter->stats.saved_reset_vfgorc += adapter->stats.vfgorc - + adapter->stats.base_vfgorc; + adapter->stats.saved_reset_vfgotc += adapter->stats.vfgotc - + adapter->stats.base_vfgotc; + adapter->stats.saved_reset_vfmprc += adapter->stats.vfmprc - + adapter->stats.base_vfmprc; + } +} + +static void ixgbevf_init_last_counter_stats(struct ixgbevf_adapter *adapter) +{ + struct ixgbe_hw *hw = &adapter->hw; + + adapter->stats.last_vfgprc = IXGBE_READ_REG(hw, IXGBE_VFGPRC); + adapter->stats.last_vfgorc = IXGBE_READ_REG(hw, IXGBE_VFGORC_LSB); + adapter->stats.last_vfgorc |= + (((u64)(IXGBE_READ_REG(hw, IXGBE_VFGORC_MSB))) << 32); + adapter->stats.last_vfgptc = IXGBE_READ_REG(hw, IXGBE_VFGPTC); + adapter->stats.last_vfgotc = IXGBE_READ_REG(hw, IXGBE_VFGOTC_LSB); + adapter->stats.last_vfgotc |= + (((u64)(IXGBE_READ_REG(hw, IXGBE_VFGOTC_MSB))) << 32); + adapter->stats.last_vfmprc = IXGBE_READ_REG(hw, IXGBE_VFMPRC); + + adapter->stats.base_vfgprc = adapter->stats.last_vfgprc; + adapter->stats.base_vfgorc = adapter->stats.last_vfgorc; + adapter->stats.base_vfgptc = adapter->stats.last_vfgptc; + adapter->stats.base_vfgotc = adapter->stats.last_vfgotc; + adapter->stats.base_vfmprc = adapter->stats.last_vfmprc; +} + static int ixgbevf_up_complete(struct ixgbevf_adapter *adapter) { struct net_device *netdev = adapter->netdev; @@ -1656,6 +1694,9 @@ static int ixgbevf_up_complete(struct ixgbevf_adapter *adapter) /* enable transmits */ netif_tx_start_all_queues(netdev); + ixgbevf_save_reset_stats(adapter); + ixgbevf_init_last_counter_stats(adapter); + /* bring the link up in the watchdog, this could race with our first * link up interrupt but shouldn't be a problem */ adapter->flags |= IXGBE_FLAG_NEED_LINK_UPDATE; @@ -2228,27 +2269,6 @@ out: return err; } -static void ixgbevf_init_last_counter_stats(struct ixgbevf_adapter *adapter) -{ - struct ixgbe_hw *hw = &adapter->hw; - - adapter->stats.last_vfgprc = IXGBE_READ_REG(hw, IXGBE_VFGPRC); - adapter->stats.last_vfgorc = IXGBE_READ_REG(hw, IXGBE_VFGORC_LSB); - adapter->stats.last_vfgorc |= - (((u64)(IXGBE_READ_REG(hw, IXGBE_VFGORC_MSB))) << 32); - adapter->stats.last_vfgptc = IXGBE_READ_REG(hw, IXGBE_VFGPTC); - adapter->stats.last_vfgotc = IXGBE_READ_REG(hw, IXGBE_VFGOTC_LSB); - adapter->stats.last_vfgotc |= - (((u64)(IXGBE_READ_REG(hw, IXGBE_VFGOTC_MSB))) << 32); - adapter->stats.last_vfmprc = IXGBE_READ_REG(hw, IXGBE_VFMPRC); - - adapter->stats.base_vfgprc = adapter->stats.last_vfgprc; - adapter->stats.base_vfgorc = adapter->stats.last_vfgorc; - adapter->stats.base_vfgptc = adapter->stats.last_vfgptc; - adapter->stats.base_vfgotc = adapter->stats.last_vfgotc; - adapter->stats.base_vfmprc = adapter->stats.last_vfmprc; -} - #define UPDATE_VF_COUNTER_32bit(reg, last_counter, counter) \ { \ u32 current_counter = IXGBE_READ_REG(hw, reg); \ @@ -2416,9 +2436,9 @@ static void ixgbevf_watchdog_task(struct work_struct *work) } } -pf_has_reset: ixgbevf_update_stats(adapter); +pf_has_reset: /* Force detection of hung controller every watchdog period */ adapter->detect_tx_hung = true; @@ -3390,8 +3410,6 @@ static int __devinit ixgbevf_probe(struct pci_dev *pdev, /* setup the private structure */ err = ixgbevf_sw_init(adapter); - ixgbevf_init_last_counter_stats(adapter); - #ifdef MAX_SKB_FRAGS netdev->features = NETIF_F_SG | NETIF_F_IP_CSUM | @@ -3449,6 +3467,8 @@ static int __devinit ixgbevf_probe(struct pci_dev *pdev, adapter->netdev_registered = true; + ixgbevf_init_last_counter_stats(adapter); + /* print the MAC address */ hw_dbg(hw, "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x\n", netdev->dev_addr[0], -- cgit v1.2.3