net: hns3: add handler for NCSI error mailbox

When NCSI has HW error, the IMP will report this error to the driver
by sending a mailbox. After received this message, the driver should
assert a global reset to fix this kind of HW error.
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Reviewed-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hclge_mbx.h

@@ -48,6 +48,7 @@ enum HCLGE_MBX_OPCODE {
 
 	HCLGE_MBX_GET_VF_FLR_STATUS = 200, /* (M7 -> PF) get vf reset status */
 	HCLGE_MBX_PUSH_LINK_STATUS,	/* (M7 -> PF) get port link status */
+	HCLGE_MBX_NCSI_ERROR,		/* (M7 -> PF) receive a NCSI error */
 };
 
 /* below are per-VF mac-vlan subcodes */

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

@@ -394,6 +394,7 @@ static int hclge_firmware_compat_config(struct hclge_dev *hdev)
 	req = (struct hclge_firmware_compat_cmd *)desc.data;
 
 	hnae3_set_bit(compat, HCLGE_LINK_EVENT_REPORT_EN_B, 1);
+	hnae3_set_bit(compat, HCLGE_NCSI_ERROR_REPORT_EN_B, 1);
 	req->compat = cpu_to_le32(compat);
 
 	return hclge_cmd_send(&hdev->hw, &desc, 1);

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

@@ -1011,6 +1011,7 @@ struct hclge_query_ppu_pf_other_int_dfx_cmd {
 };
 
 #define HCLGE_LINK_EVENT_REPORT_EN_B	0
+#define HCLGE_NCSI_ERROR_REPORT_EN_B	1
 struct hclge_firmware_compat_cmd {
 	__le32 compat;
 	u8 rsv[20];

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

@@ -582,6 +582,15 @@ static bool hclge_cmd_crq_empty(struct hclge_hw *hw)
 	return tail == hw->cmq.crq.next_to_use;
 }
 
+static void hclge_handle_ncsi_error(struct hclge_dev *hdev)
+{
+	struct hnae3_ae_dev *ae_dev = hdev->ae_dev;
+
+	ae_dev->ops->set_default_reset_request(ae_dev, HNAE3_GLOBAL_RESET);
+	dev_warn(&hdev->pdev->dev, "requesting reset due to NCSI error\n");
+	ae_dev->ops->reset_event(hdev->pdev, NULL);
+}
+
 void hclge_mbx_handler(struct hclge_dev *hdev)
 {
 	struct hclge_cmq_ring *crq = &hdev->hw.cmq.crq;
@@ -740,6 +749,9 @@ void hclge_mbx_handler(struct hclge_dev *hdev)
 		case HCLGE_MBX_PUSH_LINK_STATUS:
 			hclge_handle_link_change_event(hdev, req);
 			break;
+		case HCLGE_MBX_NCSI_ERROR:
+			hclge_handle_ncsi_error(hdev);
+			break;
 		default:
 			dev_err(&hdev->pdev->dev,
 				"un-supported mailbox message, code = %d\n",