qlcnic: aer support

Pci error recovery support added.

Signed-off-by: Sucheta Chakraborty <sucheta.chakraborty@qlogic.com>
Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 137 insertions, 1 deletions

diff --git a/drivers/net/qlcnic/qlcnic.h b/drivers/net/qlcnic/qlcnic.h
index 02a50e60166d..064464201cbb 100644
--- a/drivers/net/qlcnic/qlcnic.h
+++ b/drivers/net/qlcnic/qlcnic.h
@@ -911,6 +911,7 @@ struct qlcnic_mac_req {
 #define __QLCNIC_DEV_UP                 1
 #define __QLCNIC_RESETTING              2
 #define __QLCNIC_START_FW               4
+#define __QLCNIC_AER                    5
 
 #define QLCNIC_INTERRUPT_TEST           1
 #define QLCNIC_LOOPBACK_TEST            2
diff --git a/drivers/net/qlcnic/qlcnic_main.c b/drivers/net/qlcnic/qlcnic_main.c
index 0995f90b0bac..d5c94a3364f7 100644
--- a/drivers/net/qlcnic/qlcnic_main.c
+++ b/drivers/net/qlcnic/qlcnic_main.c
@@ -34,6 +34,7 @@
 #include <linux/ipv6.h>
 #include <linux/inetdevice.h>
 #include <linux/sysfs.h>
+#include <linux/aer.h>
 
 MODULE_DESCRIPTION("QLogic 1/10 GbE Converged/Intelligent Ethernet Driver");
 MODULE_LICENSE("GPL");
@@ -1306,6 +1307,7 @@ qlcnic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
                 goto err_out_disable_pdev;
 
         pci_set_master(pdev);
+        pci_enable_pcie_error_reporting(pdev);
 
         netdev = alloc_etherdev(sizeof(struct qlcnic_adapter));
         if (!netdev) {
@@ -1437,6 +1439,7 @@ static void __devexit qlcnic_remove(struct pci_dev *pdev)
 
         qlcnic_release_firmware(adapter);
 
+        pci_disable_pcie_error_reporting(pdev);
         pci_release_regions(pdev);
         pci_disable_device(pdev);
         pci_set_drvdata(pdev, NULL);
@@ -2521,6 +2524,9 @@ static void
 qlcnic_schedule_work(struct qlcnic_adapter *adapter,
                 work_func_t func, int delay)
 {
+        if (test_bit(__QLCNIC_AER, &adapter->state))
+                return;
+
         INIT_DELAYED_WORK(&adapter->fw_work, func);
         schedule_delayed_work(&adapter->fw_work, round_jiffies_relative(delay));
 }
@@ -2631,6 +2637,128 @@ reschedule:
         qlcnic_schedule_work(adapter, qlcnic_fw_poll_work, FW_POLL_DELAY);
 }
 
+static int qlcnic_is_first_func(struct pci_dev *pdev)
+{
+        struct pci_dev *oth_pdev;
+        int val = pdev->devfn;
+
+        while (val-- > 0) {
+                oth_pdev = pci_get_domain_bus_and_slot(pci_domain_nr
+                        (pdev->bus), pdev->bus->number,
+                        PCI_DEVFN(PCI_SLOT(pdev->devfn), val));
+
+                if (oth_pdev && (oth_pdev->current_state != PCI_D3cold))
+                        return 0;
+        }
+        return 1;
+}
+
+static int qlcnic_attach_func(struct pci_dev *pdev)
+{
+        int err, first_func;
+        struct qlcnic_adapter *adapter = pci_get_drvdata(pdev);
+        struct net_device *netdev = adapter->netdev;
+
+        pdev->error_state = pci_channel_io_normal;
+
+        err = pci_enable_device(pdev);
+        if (err)
+                return err;
+
+        pci_set_power_state(pdev, PCI_D0);
+        pci_set_master(pdev);
+        pci_restore_state(pdev);
+
+        first_func = qlcnic_is_first_func(pdev);
+
+        if (qlcnic_api_lock(adapter))
+                return -EINVAL;
+
+        if (first_func) {
+                adapter->need_fw_reset = 1;
+                set_bit(__QLCNIC_START_FW, &adapter->state);
+                QLCWR32(adapter, QLCNIC_CRB_DEV_STATE, QLCNIC_DEV_INITIALIZING);
+                QLCDB(adapter, DRV, "Restarting fw\n");
+        }
+        qlcnic_api_unlock(adapter);
+
+        err = adapter->nic_ops->start_firmware(adapter);
+        if (err)
+                return err;
+
+        qlcnic_clr_drv_state(adapter);
+        qlcnic_setup_intr(adapter);
+
+        if (netif_running(netdev)) {
+                err = qlcnic_attach(adapter);
+                if (err) {
+                        qlcnic_clr_all_drv_state(adapter);
+                        clear_bit(__QLCNIC_AER, &adapter->state);
+                        netif_device_attach(netdev);
+                        return err;
+                }
+
+                err = qlcnic_up(adapter, netdev);
+                if (err)
+                        goto done;
+
+                qlcnic_config_indev_addr(netdev, NETDEV_UP);
+        }
+ done:
+        netif_device_attach(netdev);
+        return err;
+}
+
+static pci_ers_result_t qlcnic_io_error_detected(struct pci_dev *pdev,
+                                                pci_channel_state_t state)
+{
+        struct qlcnic_adapter *adapter = pci_get_drvdata(pdev);
+        struct net_device *netdev = adapter->netdev;
+
+        if (state == pci_channel_io_perm_failure)
+                return PCI_ERS_RESULT_DISCONNECT;
+
+        if (state == pci_channel_io_normal)
+                return PCI_ERS_RESULT_RECOVERED;
+
+        set_bit(__QLCNIC_AER, &adapter->state);
+        netif_device_detach(netdev);
+
+        cancel_delayed_work_sync(&adapter->fw_work);
+
+        if (netif_running(netdev))
+                qlcnic_down(adapter, netdev);
+
+        qlcnic_detach(adapter);
+        qlcnic_teardown_intr(adapter);
+
+        clear_bit(__QLCNIC_RESETTING, &adapter->state);
+
+        pci_save_state(pdev);
+        pci_disable_device(pdev);
+
+        return PCI_ERS_RESULT_NEED_RESET;
+}
+
+static pci_ers_result_t qlcnic_io_slot_reset(struct pci_dev *pdev)
+{
+        return qlcnic_attach_func(pdev) ? PCI_ERS_RESULT_DISCONNECT :
+                                PCI_ERS_RESULT_RECOVERED;
+}
+
+static void qlcnic_io_resume(struct pci_dev *pdev)
+{
+        struct qlcnic_adapter *adapter = pci_get_drvdata(pdev);
+
+        pci_cleanup_aer_uncorrect_error_status(pdev);
+
+        if (QLCRD32(adapter, QLCNIC_CRB_DEV_STATE) == QLCNIC_DEV_READY &&
+            test_and_clear_bit(__QLCNIC_AER, &adapter->state))
+                qlcnic_schedule_work(adapter, qlcnic_fw_poll_work,
+                                                FW_POLL_DELAY);
+}
+
+
 static int
 qlcnicvf_start_firmware(struct qlcnic_adapter *adapter)
 {
@@ -3436,6 +3564,11 @@ static void
 qlcnic_config_indev_addr(struct net_device *dev, unsigned long event)
 { }
 #endif
+static struct pci_error_handlers qlcnic_err_handler = {
+        .error_detected = qlcnic_io_error_detected,
+        .slot_reset = qlcnic_io_slot_reset,
+        .resume = qlcnic_io_resume,
+};
 
 static struct pci_driver qlcnic_driver = {
         .name = qlcnic_driver_name,
@@ -3446,7 +3579,9 @@ static struct pci_driver qlcnic_driver = {
         .suspend = qlcnic_suspend,
         .resume = qlcnic_resume,
 #endif
-        .shutdown = qlcnic_shutdown
+        .shutdown = qlcnic_shutdown,
+        .err_handler = &qlcnic_err_handler
+
 };
 
 static int __init qlcnic_init_module(void)