i40e: Fix ethtool offline test

If the system administrator is requesting an offline diagnostic test using
'ethtool -t' then we should, you know, actually take the device offline
before doing the testing.

Change-ID: I6afa1cbfcc821c9ab6e6f47ed4d8dc2d8dd20e82
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

@@ -1530,6 +1530,7 @@ static void i40e_diag_test(struct net_device *netdev,
 			   struct ethtool_test *eth_test, u64 *data)
 {
 	struct i40e_netdev_priv *np = netdev_priv(netdev);
+	bool if_running = netif_running(netdev);
 	struct i40e_pf *pf = np->vsi->back;
 
 	if (eth_test->flags == ETH_TEST_FL_OFFLINE) {
@@ -1537,6 +1538,12 @@ 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 the device is online then take it offline */
+		if (if_running)
+			/* indicate we're in test mode */
+			dev_close(netdev);
+		else
+			i40e_do_reset(pf, (1 << __I40E_PF_RESET_REQUESTED));
 
 		/* Link test performed before hardware reset
 		 * so autoneg doesn't interfere with test result
@@ -1559,6 +1566,9 @@ static void i40e_diag_test(struct net_device *netdev,
 
 		clear_bit(__I40E_TESTING, &pf->state);
 		i40e_do_reset(pf, (1 << __I40E_PF_RESET_REQUESTED));
+
+		if (if_running)
+			dev_open(netdev);
 	} else {
 		/* Online tests */
 		netif_info(pf, drv, netdev, "online testing starting\n");