From linas@austin.ibm.com Fri Nov 18 14:09:23 2005 Date: Fri, 18 Nov 2005 16:23:54 -0600 From: linas To: greg@kroah.com Subject: PCI Error Recovery: e1000 network device driver Message-ID: <20051118222354.GD12645@austin.ibm.com> Content-Disposition: inline Various PCI bus errors can be signaled by newer PCI controllers. This patch adds the PCI error recovery callbacks to the intel gigabit ethernet e1000 device driver. The patch has been tested, and appears to work well. Signed-off-by: Linas Vepstas Signed-off-by: Greg Kroah-Hartman --- drivers/net/e1000/e1000_main.c | 101 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 100 insertions(+), 1 deletion(-) --- gregkh-2.6.orig/drivers/net/e1000/e1000_main.c +++ gregkh-2.6/drivers/net/e1000/e1000_main.c @@ -206,6 +206,16 @@ static void e1000_netpoll (struct net_de void e1000_rx_schedule(void *data); #endif +static pci_ers_result_t e1000_io_error_detected(struct pci_dev *pdev, pci_channel_state_t state); +static pci_ers_result_t e1000_io_slot_reset(struct pci_dev *pdev); +static void e1000_io_resume(struct pci_dev *pdev); + +static struct pci_error_handlers e1000_err_handler = { + .error_detected = e1000_io_error_detected, + .slot_reset = e1000_io_slot_reset, + .resume = e1000_io_resume, +}; + /* Exported from other modules */ extern void e1000_check_options(struct e1000_adapter *adapter); @@ -218,8 +228,9 @@ static struct pci_driver e1000_driver = /* Power Managment Hooks */ #ifdef CONFIG_PM .suspend = e1000_suspend, - .resume = e1000_resume + .resume = e1000_resume, #endif + .err_handler = &e1000_err_handler, }; MODULE_AUTHOR("Intel Corporation, "); @@ -2926,6 +2937,10 @@ e1000_update_stats(struct e1000_adapter #define PHY_IDLE_ERROR_COUNT_MASK 0x00FF + /* Prevent stats update while adapter is being reset */ + if (adapter->link_speed == 0) + return; + spin_lock_irqsave(&adapter->stats_lock, flags); /* these counters are modified from e1000_adjust_tbi_stats, @@ -4347,4 +4362,88 @@ e1000_netpoll(struct net_device *netdev) } #endif +/* --------------- PCI Error Recovery infrastructure ------------ */ +/** e1000_io_error_detected() is called when PCI error is detected */ +static pci_ers_result_t e1000_io_error_detected(struct pci_dev *pdev, pci_channel_state_t state) +{ + struct net_device *netdev = pci_get_drvdata(pdev); + struct e1000_adapter *adapter = netdev->priv; + + if (netif_running(netdev)) + e1000_down(adapter); + + /* Request a slot slot reset. */ + return PCI_ERS_RESULT_NEED_RESET; +} + +/** e1000_io_slot_reset is called after the pci bus has been reset. + * Restart the card from scratch. + * Implementation resembles the first-half of the + * e1000_resume routine. + */ +static pci_ers_result_t e1000_io_slot_reset(struct pci_dev *pdev) +{ + struct net_device *netdev = pci_get_drvdata(pdev); + struct e1000_adapter *adapter = netdev->priv; + + if (pci_enable_device(pdev)) { + printk(KERN_ERR "e1000: Cannot re-enable PCI device after reset.\n"); + return PCI_ERS_RESULT_DISCONNECT; + } + pci_set_master(pdev); + + pci_enable_wake(pdev, 3, 0); + pci_enable_wake(pdev, 4, 0); /* 4 == D3 cold */ + + /* Perform card reset only on one instance of the card */ + if(0 != PCI_FUNC (pdev->devfn)) + return PCI_ERS_RESULT_RECOVERED; + + e1000_reset(adapter); + E1000_WRITE_REG(&adapter->hw, WUS, ~0); + + return PCI_ERS_RESULT_RECOVERED; +} + +/** e1000_io_resume is called when the error recovery driver + * tells us that its OK to resume normal operation. + * Implementation resembles the second-half of the + * e1000_resume routine. + */ +static void e1000_io_resume(struct pci_dev *pdev) +{ + struct net_device *netdev = pci_get_drvdata(pdev); + struct e1000_adapter *adapter = netdev->priv; + uint32_t manc, swsm; + + if(netif_running(netdev)) { + if (e1000_up(adapter)) { + printk("e1000: can't bring device back up after reset\n"); + return; + } + } + + netif_device_attach(netdev); + + if(adapter->hw.mac_type >= e1000_82540 && + adapter->hw.media_type == e1000_media_type_copper) { + manc = E1000_READ_REG(&adapter->hw, MANC); + manc &= ~(E1000_MANC_ARP_EN); + E1000_WRITE_REG(&adapter->hw, MANC, manc); + } + + switch(adapter->hw.mac_type) { + case e1000_82573: + swsm = E1000_READ_REG(&adapter->hw, SWSM); + E1000_WRITE_REG(&adapter->hw, SWSM, + swsm | E1000_SWSM_DRV_LOAD); + break; + default: + break; + } + + if(netif_running(netdev)) + mod_timer(&adapter->watchdog_timer, jiffies); +} + /* e1000_main.c */