i40e: Disable offline diagnostics if VFs are enabled

Require the user to disable virtual functions before running the device
offline diagnostics.  The offline diagnostics are intended to ensure
basic operation of the device - it is beyond the scope of the diagnostic
test to handle the additional complexity of bringing all the virtual
functions offline and then back online for each test run.

Change-ID: Ic0b854851a09fc85df0c9e82c220e45885457c30
Signed-off-by: NGreg Rose <gregory.v.rose@intel.com>
Tested-by: NJim Young <james.m.young@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_ethtool.c

@@ -1548,6 +1548,17 @@ static int i40e_loopback_test(struct net_device *netdev, u64 *data)
 	return *data;
 }
 
+static inline bool i40e_active_vfs(struct i40e_pf *pf)
+{
+	struct i40e_vf *vfs = pf->vf;
+	int i;
+
+	for (i = 0; i < pf->num_alloc_vfs; i++)
+		if (vfs[i].vf_states & I40E_VF_STAT_ACTIVE)
+			return true;
+	return false;
+}
+
 static void i40e_diag_test(struct net_device *netdev,
 			   struct ethtool_test *eth_test, u64 *data)
 {
@@ -1560,6 +1571,20 @@ static void i40e_diag_test(struct net_device *netdev,
 		netif_info(pf, drv, netdev, "offline testing starting\n");
 
 		set_bit(__I40E_TESTING, &pf->state);
+
+		if (i40e_active_vfs(pf)) {
+			dev_warn(&pf->pdev->dev,
+				 "Please take active VFS offline and restart the adapter before running NIC diagnostics\n");
+			data[I40E_ETH_TEST_REG]		= 1;
+			data[I40E_ETH_TEST_EEPROM]	= 1;
+			data[I40E_ETH_TEST_INTR]	= 1;
+			data[I40E_ETH_TEST_LOOPBACK]	= 1;
+			data[I40E_ETH_TEST_LINK]	= 1;
+			eth_test->flags |= ETH_TEST_FL_FAILED;
+			clear_bit(__I40E_TESTING, &pf->state);
+			goto skip_ol_tests;
+		}
+
 		/* If the device is online then take it offline */
 		if (if_running)
 			/* indicate we're in test mode */
@@ -1605,6 +1630,8 @@ static void i40e_diag_test(struct net_device *netdev,
 		data[I40E_ETH_TEST_LOOPBACK] = 0;
 	}
 
+skip_ol_tests:
+
 	netif_info(pf, drv, netdev, "testing finished\n");
 }
 

drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c

@@ -980,6 +980,13 @@ static int i40e_pci_sriov_enable(struct pci_dev *pdev, int num_vfs)
 	int pre_existing_vfs = pci_num_vf(pdev);
 	int err = 0;
 
+	if (pf->state & __I40E_TESTING) {
+		dev_warn(&pdev->dev,
+			 "Cannot enable SR-IOV virtual functions while the device is undergoing diagnostic testing\n");
+		err = -EPERM;
+		goto err_out;
+	}
+
 	dev_info(&pdev->dev, "Allocating %d VFs.\n", num_vfs);
 	if (pre_existing_vfs && pre_existing_vfs != num_vfs)
 		i40e_free_vfs(pf);