net: hns3: Prevent sending command during global or core reset

According to hardware's description, driver should not send command to
IMP while hardware doing global or core reset.

Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c

@@ -206,7 +206,8 @@ int hclge_cmd_send(struct hclge_hw *hw, struct hclge_desc *desc, int num)
 
 	spin_lock_bh(&hw->cmq.csq.lock);
 
-	if (num > hclge_ring_space(&hw->cmq.csq)) {
+	if (num > hclge_ring_space(&hw->cmq.csq) ||
+	    test_bit(HCLGE_STATE_CMD_DISABLE, &hdev->state)) {
 		spin_unlock_bh(&hw->cmq.csq.lock);
 		return -EBUSY;
 	}
@@ -346,6 +347,7 @@ int hclge_cmd_init(struct hclge_dev *hdev)
 	spin_lock_init(&hdev->hw.cmq.crq.lock);
 
 	hclge_cmd_init_regs(&hdev->hw);
+	clear_bit(HCLGE_STATE_CMD_DISABLE, &hdev->state);
 
 	ret = hclge_cmd_query_firmware_version(&hdev->hw, &version);
 	if (ret) {

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c

@@ -2507,12 +2507,14 @@ static u32 hclge_check_event_cause(struct hclge_dev *hdev, u32 *clearval)
 
 	/* check for vector0 reset event sources */
 	if (BIT(HCLGE_VECTOR0_GLOBALRESET_INT_B) & rst_src_reg) {
+		set_bit(HCLGE_STATE_CMD_DISABLE, &hdev->state);
 		set_bit(HNAE3_GLOBAL_RESET, &hdev->reset_pending);
 		*clearval = BIT(HCLGE_VECTOR0_GLOBALRESET_INT_B);
 		return HCLGE_VECTOR0_EVENT_RST;
 	}
 
 	if (BIT(HCLGE_VECTOR0_CORERESET_INT_B) & rst_src_reg) {
+		set_bit(HCLGE_STATE_CMD_DISABLE, &hdev->state);
 		set_bit(HNAE3_CORE_RESET, &hdev->reset_pending);
 		*clearval = BIT(HCLGE_VECTOR0_CORERESET_INT_B);
 		return HCLGE_VECTOR0_EVENT_RST;

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h

@@ -128,6 +128,7 @@ enum HCLGE_DEV_STATE {
 	HCLGE_STATE_MBX_SERVICE_SCHED,
 	HCLGE_STATE_MBX_HANDLING,
 	HCLGE_STATE_STATISTICS_UPDATING,
+	HCLGE_STATE_CMD_DISABLE,
 	HCLGE_STATE_MAX
 };