qlcnic: support quiescent mode

Put device in quiescent mode during internal loopback test.
Before running test, set state to NEED_QUISCENT. After getting
ack from all function, change state to QUISCENT and perform 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

@@ -1313,6 +1313,8 @@ int qlcnic_set_ilb_mode(struct qlcnic_adapter *adapter);
 void qlcnic_fetch_mac(struct qlcnic_adapter *, u32, u32, u8, u8 *);
 
 /* Functions from qlcnic_main.c */
+int qlcnic_request_quiscent_mode(struct qlcnic_adapter *adapter);
+void qlcnic_clear_quiscent_mode(struct qlcnic_adapter *adapter);
 int qlcnic_reset_context(struct qlcnic_adapter *);
 u32 qlcnic_issue_cmd(struct qlcnic_adapter *adapter,
 	u32 pci_fn, u32 version, u32 arg1, u32 arg2, u32 arg3, u32 cmd);

drivers/net/qlcnic/qlcnic_ethtool.c

@@ -706,6 +706,11 @@ static int qlcnic_loopback_test(struct net_device *netdev)
 	if (test_and_set_bit(__QLCNIC_RESETTING, &adapter->state))
 		return -EIO;
 
+	if (qlcnic_request_quiscent_mode(adapter)) {
+		clear_bit(__QLCNIC_RESETTING, &adapter->state);
+		return -EIO;
+	}
+
 	ret = qlcnic_diag_alloc_res(netdev, QLCNIC_LOOPBACK_TEST);
 	if (ret)
 		goto clear_it;
@@ -722,6 +727,7 @@ static int qlcnic_loopback_test(struct net_device *netdev)
 	qlcnic_diag_free_res(netdev, max_sds_rings);
 
 clear_it:
+	qlcnic_clear_quiscent_mode(adapter);
 	adapter->max_sds_rings = max_sds_rings;
 	clear_bit(__QLCNIC_RESETTING, &adapter->state);
 	return ret;

drivers/net/qlcnic/qlcnic_main.c

@@ -2712,7 +2712,8 @@ qlcnic_fwinit_work(struct work_struct *work)
 		goto err_ret;
 
 	dev_state = QLCRD32(adapter, QLCNIC_CRB_DEV_STATE);
-	if (dev_state ==  QLCNIC_DEV_QUISCENT) {
+	if (dev_state == QLCNIC_DEV_QUISCENT ||
+	    dev_state == QLCNIC_DEV_NEED_QUISCENT) {
 		qlcnic_api_unlock(adapter);
 		qlcnic_schedule_work(adapter, qlcnic_fwinit_work,
 						FW_POLL_DELAY * 2);
@@ -2734,18 +2735,6 @@ qlcnic_fwinit_work(struct work_struct *work)
 skip_ack_check:
 		dev_state = QLCRD32(adapter, QLCNIC_CRB_DEV_STATE);
 
-		if (dev_state == QLCNIC_DEV_NEED_QUISCENT) {
-			QLCWR32(adapter, QLCNIC_CRB_DEV_STATE,
-						QLCNIC_DEV_QUISCENT);
-			qlcnic_schedule_work(adapter, qlcnic_fwinit_work,
-						FW_POLL_DELAY * 2);
-			QLCDB(adapter, DRV, "Quiscing the driver\n");
-			qlcnic_idc_debug_info(adapter, 0);
-
-			qlcnic_api_unlock(adapter);
-			return;
-		}
-
 		if (dev_state == QLCNIC_DEV_NEED_RESET) {
 			QLCWR32(adapter, QLCNIC_CRB_DEV_STATE,
 						QLCNIC_DEV_INITIALIZING);
@@ -2802,7 +2791,12 @@ qlcnic_detach_work(struct work_struct *work)
 
 	netif_device_detach(netdev);
 
-	qlcnic_down(adapter, netdev);
+	/* Dont grab rtnl lock during Quiscent mode */
+	if (adapter->dev_state == QLCNIC_DEV_NEED_QUISCENT) {
+		if (netif_running(netdev))
+			__qlcnic_down(adapter, netdev);
+	} else
+		qlcnic_down(adapter, netdev);
 
 	status = QLCRD32(adapter, QLCNIC_PEG_HALT_STATUS1);
 
@@ -2844,6 +2838,61 @@ qlcnic_set_npar_non_operational(struct qlcnic_adapter *adapter)
 	qlcnic_api_unlock(adapter);
 }
 
+/* Caller should held RESETTING bit.
+ * This should be call in sync with qlcnic_request_quiscent_mode.
+ */
+void qlcnic_clear_quiscent_mode(struct qlcnic_adapter *adapter)
+{
+	qlcnic_clr_drv_state(adapter);
+	qlcnic_api_lock(adapter);
+	QLCWR32(adapter, QLCNIC_CRB_DEV_STATE, QLCNIC_DEV_READY);
+	qlcnic_api_unlock(adapter);
+}
+
+/* Caller should held RESETTING bit.
+ */
+int qlcnic_request_quiscent_mode(struct qlcnic_adapter *adapter)
+{
+	u8 timeo = adapter->dev_init_timeo / 2;
+	u32 state;
+
+	if (qlcnic_api_lock(adapter))
+		return -EIO;
+
+	state = QLCRD32(adapter, QLCNIC_CRB_DEV_STATE);
+	if (state != QLCNIC_DEV_READY)
+		return -EIO;
+
+	QLCWR32(adapter, QLCNIC_CRB_DEV_STATE, QLCNIC_DEV_NEED_QUISCENT);
+	qlcnic_api_unlock(adapter);
+	QLCDB(adapter, DRV, "NEED QUISCENT state set\n");
+	qlcnic_idc_debug_info(adapter, 0);
+
+	qlcnic_set_drv_state(adapter, QLCNIC_DEV_NEED_QUISCENT);
+
+	do {
+		msleep(2000);
+		state = QLCRD32(adapter, QLCNIC_CRB_DEV_STATE);
+		if (state == QLCNIC_DEV_QUISCENT)
+			return 0;
+		if (!qlcnic_check_drv_state(adapter)) {
+			if (qlcnic_api_lock(adapter))
+				return -EIO;
+			QLCWR32(adapter, QLCNIC_CRB_DEV_STATE,
+							QLCNIC_DEV_QUISCENT);
+			qlcnic_api_unlock(adapter);
+			QLCDB(adapter, DRV, "QUISCENT mode set\n");
+			return 0;
+		}
+	} while (--timeo);
+
+	dev_err(&adapter->pdev->dev, "Failed to quiesce device, DRV_STATE=%08x"
+		" DRV_ACTIVE=%08x\n", QLCRD32(adapter, QLCNIC_CRB_DRV_STATE),
+		QLCRD32(adapter, QLCNIC_CRB_DRV_ACTIVE));
+	qlcnic_clear_quiscent_mode(adapter);
+	return -EIO;
+}
+
 /*Transit to RESET state from READY state only */
 static void
 qlcnic_dev_request_reset(struct qlcnic_adapter *adapter)
@@ -2951,11 +3000,11 @@ qlcnic_check_health(struct qlcnic_adapter *adapter)
 		qlcnic_dev_request_reset(adapter);
 
 	state = QLCRD32(adapter, QLCNIC_CRB_DEV_STATE);
-	if (state == QLCNIC_DEV_NEED_RESET ||
-	    state == QLCNIC_DEV_NEED_QUISCENT) {
+	if (state == QLCNIC_DEV_NEED_RESET) {
 		qlcnic_set_npar_non_operational(adapter);
 		adapter->need_fw_reset = 1;
-	}
+	} else if (state == QLCNIC_DEV_NEED_QUISCENT)
+		goto detach;
 
 	heartbeat = QLCRD32(adapter, QLCNIC_PEG_ALIVE_COUNTER);
 	if (heartbeat != adapter->heartbeat) {