ixgbevf: Add support for PCI error handling

This change adds support for handling IO errors and slot resets.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index 7cb678d..ccc801e 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -3189,12 +3189,92 @@ static void __devexit ixgbevf_remove(struct pci_dev *pdev)
        pci_disable_device(pdev);
 }
 
+/**
+ * ixgbevf_io_error_detected - called when PCI error is detected
+ * @pdev: Pointer to PCI device
+ * @state: The current pci connection state
+ *
+ * This function is called after a PCI bus error affecting
+ * this device has been detected.
+ */
+static pci_ers_result_t ixgbevf_io_error_detected(struct pci_dev *pdev,
+                                                 pci_channel_state_t state)
+{
+       struct net_device *netdev = pci_get_drvdata(pdev);
+       struct ixgbevf_adapter *adapter = netdev_priv(netdev);
+
+       netif_device_detach(netdev);
+
+       if (state == pci_channel_io_perm_failure)
+               return PCI_ERS_RESULT_DISCONNECT;
+
+       if (netif_running(netdev))
+               ixgbevf_down(adapter);
+
+       pci_disable_device(pdev);
+
+       /* Request a slot slot reset. */
+       return PCI_ERS_RESULT_NEED_RESET;
+}
+
+/**
+ * ixgbevf_io_slot_reset - called after the pci bus has been reset.
+ * @pdev: Pointer to PCI device
+ *
+ * Restart the card from scratch, as if from a cold-boot. Implementation
+ * resembles the first-half of the ixgbevf_resume routine.
+ */
+static pci_ers_result_t ixgbevf_io_slot_reset(struct pci_dev *pdev)
+{
+       struct net_device *netdev = pci_get_drvdata(pdev);
+       struct ixgbevf_adapter *adapter = netdev_priv(netdev);
+
+       if (pci_enable_device_mem(pdev)) {
+               dev_err(&pdev->dev,
+                       "Cannot re-enable PCI device after reset.\n");
+               return PCI_ERS_RESULT_DISCONNECT;
+       }
+
+       pci_set_master(pdev);
+
+       ixgbevf_reset(adapter);
+
+       return PCI_ERS_RESULT_RECOVERED;
+}
+
+/**
+ * ixgbevf_io_resume - called when traffic can start flowing again.
+ * @pdev: Pointer to PCI device
+ *
+ * This callback is called when the error recovery driver tells us that
+ * its OK to resume normal operation. Implementation resembles the
+ * second-half of the ixgbevf_resume routine.
+ */
+static void ixgbevf_io_resume(struct pci_dev *pdev)
+{
+       struct net_device *netdev = pci_get_drvdata(pdev);
+       struct ixgbevf_adapter *adapter = netdev_priv(netdev);
+
+       if (netif_running(netdev))
+               ixgbevf_up(adapter);
+
+       netif_device_attach(netdev);
+}
+
+/* PCI Error Recovery (ERS) */
+static struct pci_error_handlers ixgbevf_err_handler = {
+       .error_detected = ixgbevf_io_error_detected,
+       .slot_reset = ixgbevf_io_slot_reset,
+       .resume = ixgbevf_io_resume,
+};
+
 static struct pci_driver ixgbevf_driver = {
        .name     = ixgbevf_driver_name,
        .id_table = ixgbevf_pci_tbl,
        .probe    = ixgbevf_probe,
        .remove   = __devexit_p(ixgbevf_remove),
        .shutdown = ixgbevf_shutdown,
+       .err_handler = &ixgbevf_err_handler
 };
 
 /**