igb: add single vector msi-x testing to interrupt test

This change adds testing of the first msix vector to the interrupt testing.
This should help with determining the cause of interrupt issues when they are
encountered.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/igb/igb_ethtool.c

@@ -1123,32 +1123,36 @@ static int igb_intr_test(struct igb_adapter *adapter, u64 *data)
 	*data = 0;
 
 	/* Hook up test interrupt handler just for this test */
-	if (adapter->msix_entries)
-		/* NOTE: we don't test MSI-X interrupts here, yet */
-		return 0;
+	if (adapter->msix_entries) {
+		if (request_irq(adapter->msix_entries[0].vector,
+		                &igb_test_intr, 0, netdev->name, adapter)) {
+			*data = 1;
+			return -1;
+		}
 
-	if (adapter->flags & IGB_FLAG_HAS_MSI) {
+	} else if (adapter->flags & IGB_FLAG_HAS_MSI) {
 		shared_int = false;
-		if (request_irq(irq, &igb_test_intr, 0, netdev->name, netdev)) {
+		if (request_irq(irq,
+		                &igb_test_intr, 0, netdev->name, adapter)) {
 			*data = 1;
 			return -1;
 		}
 	} else if (!request_irq(irq, &igb_test_intr, IRQF_PROBE_SHARED,
-				netdev->name, netdev)) {
+				netdev->name, adapter)) {
 		shared_int = false;
 	} else if (request_irq(irq, &igb_test_intr, IRQF_SHARED,
-		 netdev->name, netdev)) {
+		 netdev->name, adapter)) {
 		*data = 1;
 		return -1;
 	}
 	dev_info(&adapter->pdev->dev, "testing %s interrupt\n",
 		(shared_int ? "shared" : "unshared"));
 	/* Disable all the interrupts */
-	wr32(E1000_IMC, 0xFFFFFFFF);
+	wr32(E1000_IMC, ~0);
 	msleep(10);
 
 	/* Define all writable bits for ICS */
-	switch(hw->mac.type) {
+	switch (hw->mac.type) {
 	case e1000_82575:
 		ics_mask = 0x37F47EDD;
 		break;
@@ -1238,7 +1242,10 @@ static int igb_intr_test(struct igb_adapter *adapter, u64 *data)
 	msleep(10);
 
 	/* Unhook test interrupt handler */
-	free_irq(irq, netdev);
+	if (adapter->msix_entries)
+		free_irq(adapter->msix_entries[0].vector, adapter);
+	else
+		free_irq(irq, adapter);
 
 	return *data;
 }