netdev - [PATCH 1/1 2.6.25-rc9] bnx2x: Add EEH support in bnx2x driver

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Message-Id: <1208983414.7339.31.camel@wendyx.austin.ibm.com>
Date:	Wed, 23 Apr 2008 15:43:34 -0500
From:	wendy xiong <wendyx@...ibm.com>
To:	davem@...emloft.net, jeff@...zik.org, netdev@...r.kernel.org,
	eliezert@...adcom.com
Subject: [PATCH 1/1 2.6.25-rc9] bnx2x: Add EEH support in bnx2x driver -
	10G pci-express adapter

Hi

To enable EEH suuport for this 10G pci-express adapter, we added 3 EEH
callback functions in the driver and also msi/pcie state needs to be
saved and restored for the adapter.

Thanks,
Wendy

Signed-off-by: Wendy Xiong <wendyx@...ibm.com>

diff -Nuarp 2.6.25-rc9/drivers/net/bnx2x.c 2.6.25-rc9.bnx2x/drivers/net/bnx2x.c
--- 2.6.25-rc9/drivers/net/bnx2x.c      2008-04-23 08:38:03.000000000 -0700
+++ 2.6.25-rc9.bnx2x/drivers/net/bnx2x.c        2008-04-23 08:45:40.000000000 -0700
@@ -9645,6 +9645,7 @@ static int __devinit bnx2x_init_board(st
        }

        pci_set_master(pdev);
+       pci_save_state(pdev);

        bp->pm_cap = pci_find_capability(pdev, PCI_CAP_ID_PM);
        if (bp->pm_cap == 0) {
@@ -9963,6 +9964,85 @@ static int bnx2x_resume(struct pci_dev *
        return 0;
 }

+/**
+ * bnx2x_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 bnx2x_io_error_detected(struct pci_dev *pdev,
+                                       pci_channel_state_t state)
+{
+       struct net_device *dev = pci_get_drvdata(pdev);
+       struct bnx2x *bp = netdev_priv(dev);
+
+       rtnl_lock();
+       netif_device_detach(dev);
+
+       if (netif_running(dev))
+               bnx2x_nic_unload(bp, 0);
+
+       pci_disable_device(pdev);
+       rtnl_unlock();
+
+       /* Request a slot slot reset. */
+       return PCI_ERS_RESULT_NEED_RESET;
+}
+
+/**
+ * bnx2x_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.
+ */
+static pci_ers_result_t bnx2x_io_slot_reset(struct pci_dev *pdev)
+{
+       struct net_device *dev = pci_get_drvdata(pdev);
+       struct bnx2x *bp = netdev_priv(dev);
+
+       rtnl_lock();
+       if (pci_enable_device(pdev)) {
+               dev_err(&pdev->dev,
+                       "Cannot re-enable PCI device after reset.\n");
+               return PCI_ERS_RESULT_DISCONNECT;
+       }
+
+       pci_set_master(pdev);
+       pci_restore_state(pdev);
+       rtnl_unlock();
+
+       return PCI_ERS_RESULT_RECOVERED;
+}
+
+/**
+ * bnx2x_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.
+ */
+static void bnx2x_io_resume(struct pci_dev *pdev)
+{
+       struct net_device *dev = pci_get_drvdata(pdev);
+       struct bnx2x *bp = netdev_priv(dev);
+
+       rtnl_lock();
+
+       if (netif_running(dev))
+               bnx2x_nic_load(bp, 0);
+       netif_device_attach(dev);
+
+       rtnl_unlock();
+}
+
+static struct pci_error_handlers bnx2x_err_handler = {
+       .error_detected = bnx2x_io_error_detected,
+       .slot_reset = bnx2x_io_slot_reset,
+       .resume = bnx2x_io_resume,
+};
+
 static struct pci_driver bnx2x_pci_driver = {
        .name       = DRV_MODULE_NAME,
        .id_table   = bnx2x_pci_tbl,
@@ -9970,6 +10050,7 @@ static struct pci_driver bnx2x_pci_drive
        .remove     = __devexit_p(bnx2x_remove_one),
        .suspend    = bnx2x_suspend,
        .resume     = bnx2x_resume,
+       .err_handler= &bnx2x_err_handler,
 };

 static int __init bnx2x_init(void)


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