qlcnic: define error code for loopback test

o Defined error code such as fw not responding, test already running and
  cable not connected.
o Check Fw capability before performing loopback test.
Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/qlcnic/qlcnic.h

@@ -822,6 +822,7 @@ struct qlcnic_mac_list_s {
 #define QLCNIC_FW_CAPABILITY_BDG		BIT_8
 #define QLCNIC_FW_CAPABILITY_FVLANTX		BIT_9
 #define QLCNIC_FW_CAPABILITY_HW_LRO		BIT_10
+#define QLCNIC_FW_CAPABILITY_MULTI_LOOPBACK	BIT_27
 
 /* module types */
 #define LINKEVENT_MODULE_NOT_PRESENT			1
@@ -936,6 +937,12 @@ struct qlcnic_ipaddr {
 #define QLCNIC_READD_AGE	20
 #define QLCNIC_LB_MAX_FILTERS	64
 
+/* QLCNIC Driver Error Code */
+#define QLCNIC_FW_NOT_RESPOND		51
+#define QLCNIC_TEST_IN_PROGRESS		52
+#define QLCNIC_UNDEFINED_ERROR		53
+#define QLCNIC_LB_CABLE_NOT_CONN	54
+
 struct qlcnic_filter {
 	struct hlist_node fnode;
 	u8 faddr[ETH_ALEN];
@@ -1007,7 +1014,7 @@ struct qlcnic_adapter {
 	u8 max_mac_filters;
 	u8 dev_state;
 	u8 diag_test;
-	u8 diag_cnt;
+	char diag_cnt;
 	u8 reset_ack_timeo;
 	u8 dev_init_timeo;
 	u16 msg_enable;

drivers/net/qlcnic/qlcnic_ethtool.c

@@ -756,6 +756,11 @@ static int qlcnic_loopback_test(struct net_device *netdev, u8 mode)
 	int loop = 0;
 	int ret;
 
+	if (!(adapter->capabilities & QLCNIC_FW_CAPABILITY_MULTI_LOOPBACK)) {
+		netdev_info(netdev, "Firmware is not loopback test capable\n");
+		return -EOPNOTSUPP;
+	}
+
 	netdev_info(netdev, "%s loopback test in progress\n",
 		   mode == QLCNIC_ILB_MODE ? "internal" : "external");
 	if (adapter->op_mode == QLCNIC_NON_PRIV_FUNC) {
@@ -765,8 +770,7 @@ static int qlcnic_loopback_test(struct net_device *netdev, u8 mode)
 	}
 
 	if (test_and_set_bit(__QLCNIC_RESETTING, &adapter->state))
-		return -EIO;
-
+		return -EBUSY;
 
 	ret = qlcnic_diag_alloc_res(netdev, QLCNIC_LOOPBACK_TEST);
 	if (ret)
@@ -778,20 +782,21 @@ static int qlcnic_loopback_test(struct net_device *netdev, u8 mode)
 	if (ret)
 		goto free_res;
 
+	adapter->diag_cnt = 0;
 	do {
 		msleep(500);
 		qlcnic_process_rcv_ring_diag(sds_ring);
-		if (loop++ > QLCNIC_ILB_MAX_RCV_LOOP)
-			break;
+		if (loop++ > QLCNIC_ILB_MAX_RCV_LOOP) {
+			netdev_info(netdev, "firmware didnt respond to loopback"
+				" configure request\n");
+			ret = -QLCNIC_FW_NOT_RESPOND;
+			goto free_res;
+		} else if (adapter->diag_cnt) {
+			ret = adapter->diag_cnt;
+			goto free_res;
+		}
 	} while (!QLCNIC_IS_LB_CONFIGURED(adapter->ahw->loopback_state));
 
-	if (!QLCNIC_IS_LB_CONFIGURED(adapter->ahw->loopback_state)) {
-		netdev_info(netdev, "firmware didnt respond to loopback "
-				"configure request\n");
-		ret = adapter->ahw->loopback_state;
-		goto free_res;
-	}
-
 	ret = qlcnic_do_lb_test(adapter);
 
 	qlcnic_clear_lb_mode(adapter);

drivers/net/qlcnic/qlcnic_init.c

@@ -1354,10 +1354,16 @@ qlcnic_handle_fw_message(int desc_cnt, int index,
 			break;
 		case 1:
 			dev_info(dev, "loopback already in progress\n");
+			adapter->diag_cnt = -QLCNIC_TEST_IN_PROGRESS;
+			break;
+		case 2:
+			dev_info(dev, "loopback cable is not connected\n");
+			adapter->diag_cnt = -QLCNIC_LB_CABLE_NOT_CONN;
 			break;
 		default:
 			dev_info(dev, "loopback configure request failed,"
 					" ret %x\n", ret);
+			adapter->diag_cnt = -QLCNIC_UNDEFINED_ERROR;
 			break;
 		}
 		break;