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net: wangxun: implement pci_error_handlers ops

Support AER driver to handle the PCIe errors for Wangxun devices.

[ ... ]

[ ... ]

+static pci_ers_result_t wx_io_slot_reset(struct pci_dev *pdev)
+{
+	struct wx *wx = pci_get_drvdata(pdev);
+	pci_ers_result_t result;
+
+	if (pci_enable_device_mem(pdev)) {
+		wx_err(wx, "Cannot re-enable PCI device after reset.\n");
+		result = PCI_ERS_RESULT_DISCONNECT;
+	} else {
+		/* make all bar access done before reset. */
+		smp_mb__before_atomic();
+		clear_bit(WX_STATE_DISABLED, wx->state);
+		pci_set_master(pdev);
+		pci_restore_state(pdev);
+		pci_save_state(pdev);
+		pci_wake_from_d3(pdev, false);
+
+		wx->do_reset(wx->netdev, false);

Is it possible that the ngbe driver ignores this hardware reset request?

If ngbe_do_reset() only performs an action when reinit is true, it appears it
would be a no-op when called with false from this AER recovery path. Will
this leave the ngbe MAC hardware uninitialized after the PCI slot reset and
break the device when traffic resumes?

+		result = PCI_ERS_RESULT_RECOVERED;
+	}
+
+	pci_aer_clear_nonfatal_status(pdev);
+
+	return result;
+}
+
+/**
+ * wx_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 wx_io_resume(struct pci_dev *pdev)
+{
+	struct wx *wx = pci_get_drvdata(pdev);
+	struct net_device *netdev;
+
+	netdev = wx->netdev;
+	rtnl_lock();
+	if (netif_running(netdev))
+		netdev->netdev_ops->ndo_open(netdev);

Does this code need to check the return value of ndo_open()?

If ndo_open() fails due to memory allocation or IRQ request failures, the
resources will remain unallocated. Because the failure is ignored and
netif_device_attach() is called unconditionally below, will the networking
stack invoke the transmit handler and dereference the unallocated rings?

+
+	netif_device_attach(netdev);
+	rtnl_unlock();
+}