NetXen: Fix link status messages

NetXen: Fix incorrect link status even with switch turned OFF.
NetXen driver failed to accurately indicate when a link is up or down.
This was encountered during failover testing, when the first port
indicated that the link was up even when the 10G switch it was assigned
to in the Bladecenter was turned off completely.

Signed-off by: Wen Xiong <wenxiong@us.ibm.com>
Signed-off by: Mithlesh Thukral <mithlesh@netxen.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/netxen/netxen_nic.h

@@ -1049,6 +1049,7 @@ int netxen_rom_se(struct netxen_adapter *adapter, int addr);
 int netxen_do_rom_se(struct netxen_adapter *adapter, int addr);
 
 /* Functions from netxen_nic_isr.c */
+int netxen_nic_link_ok(struct netxen_adapter *adapter);
 void netxen_nic_isr_other(struct netxen_adapter *adapter);
 void netxen_indicate_link_status(struct netxen_adapter *adapter, u32 link);
 void netxen_handle_port_int(struct netxen_adapter *adapter, u32 enable);

drivers/net/netxen/netxen_nic_init.c

@@ -1037,18 +1037,23 @@ void netxen_watchdog_task(struct work_struct *work)
 	if ((adapter->portnum  == 0) && netxen_nic_check_temp(adapter))
 		return;
 
+	if (adapter->handle_phy_intr)
+		adapter->handle_phy_intr(adapter);
+
 	netdev = adapter->netdev;
-	if ((netif_running(netdev)) && !netif_carrier_ok(netdev)) {
-		printk(KERN_INFO "%s port %d, %s carrier is now ok\n",
-		       netxen_nic_driver_name, adapter->portnum, netdev->name);
+	if ((netif_running(netdev)) && !netif_carrier_ok(netdev) &&
+			netxen_nic_link_ok(adapter) ) {
+		printk(KERN_INFO "%s %s (port %d), Link is up\n",
+			       netxen_nic_driver_name, netdev->name, adapter->portnum);
 		netif_carrier_on(netdev);
-	}
-
-	if (netif_queue_stopped(netdev))
 		netif_wake_queue(netdev);
+	} else if(!(netif_running(netdev)) && netif_carrier_ok(netdev)) {
+		printk(KERN_ERR "%s %s Link is Down\n",
+				netxen_nic_driver_name, netdev->name);
+		netif_carrier_off(netdev);
+		netif_stop_queue(netdev);
+	}
 
-	if (adapter->handle_phy_intr)
-		adapter->handle_phy_intr(adapter);
 	mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
 }
 

drivers/net/netxen/netxen_nic_isr.c

@@ -169,6 +169,24 @@ void netxen_nic_gbe_handle_phy_intr(struct netxen_adapter *adapter)
 	netxen_nic_isr_other(adapter);
 }
 
+int netxen_nic_link_ok(struct netxen_adapter *adapter)
+{
+	switch (adapter->ahw.board_type) {
+	case NETXEN_NIC_GBE:
+		return ((adapter->ahw.qg_linksup) & 1);
+
+	case NETXEN_NIC_XGBE:
+		return ((adapter->ahw.xg_linkup) & 1);
+
+	default:
+		printk(KERN_ERR"%s: Function: %s, Unknown board type\n",
+			netxen_nic_driver_name, __FUNCTION__);
+		break;
+	}
+
+	return 0;
+}
+
 void netxen_nic_xgbe_handle_phy_intr(struct netxen_adapter *adapter)
 {
 	struct net_device *netdev = adapter->netdev;
@@ -183,6 +201,10 @@ void netxen_nic_xgbe_handle_phy_intr(struct netxen_adapter *adapter)
 		printk(KERN_INFO "%s: %s NIC Link is down\n",
 		       netxen_nic_driver_name, netdev->name);
 		adapter->ahw.xg_linkup = 0;
+		if (netif_running(netdev)) {
+			netif_carrier_off(netdev);
+			netif_stop_queue(netdev);
+		}
 		/* read twice to clear sticky bits */
 		/* WINDOW = 0 */
 		netxen_nic_read_w0(adapter, NETXEN_NIU_XG_STATUS, &val1);
@@ -196,5 +218,7 @@ void netxen_nic_xgbe_handle_phy_intr(struct netxen_adapter *adapter)
 		printk(KERN_INFO "%s: %s NIC Link is up\n",
 		       netxen_nic_driver_name, netdev->name);
 		adapter->ahw.xg_linkup = 1;
+		netif_carrier_on(netdev);
+		netif_wake_queue(netdev);
 	}
 }