net: hns3: use a reserved byte to identify need_resp flag

This patch uses a reserved byte in the hclge_mbx_vf_to_pf_cmd
to save the need_resp flag, so when PF received the mailbox,
it can use it to decise whether send a response to VF.

For hclge_set_vf_uc_mac_addr(), it should use mbx_need_resp flag
to decide whether send response to VF.
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -84,12 +84,15 @@ struct hclgevf_mbx_resp_status {
 struct hclge_mbx_vf_to_pf_cmd {
 	u8 rsv;
 	u8 mbx_src_vfid; /* Auto filled by IMP */
-	u8 rsv1[2];
+	u8 mbx_need_resp;
+	u8 rsv1[1];
 	u8 msg_len;
 	u8 rsv2[3];
 	u8 msg[HCLGE_MBX_MAX_MSG_SIZE];
 };
 
+#define HCLGE_MBX_NEED_RESP_BIT		BIT(0)
+
 struct hclge_mbx_pf_to_vf_cmd {
 	u8 dest_vfid;
 	u8 rsv[3];

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

@@ -212,8 +212,7 @@ static int hclge_set_vf_promisc_mode(struct hclge_vport *vport,
 }
 
 static int hclge_set_vf_uc_mac_addr(struct hclge_vport *vport,
-				    struct hclge_mbx_vf_to_pf_cmd *mbx_req,
-				    bool gen_resp)
+				    struct hclge_mbx_vf_to_pf_cmd *mbx_req)
 {
 	const u8 *mac_addr = (const u8 *)(&mbx_req->msg[2]);
 	struct hclge_dev *hdev = vport->back;
@@ -249,7 +248,7 @@ static int hclge_set_vf_uc_mac_addr(struct hclge_vport *vport,
 		return -EIO;
 	}
 
-	if (gen_resp)
+	if (mbx_req->mbx_need_resp & HCLGE_MBX_NEED_RESP_BIT)
 		hclge_gen_resp_to_vf(vport, mbx_req, status, NULL, 0);
 
 	return 0;
@@ -597,7 +596,7 @@ void hclge_mbx_handler(struct hclge_dev *hdev)
 					ret);
 			break;
 		case HCLGE_MBX_SET_UNICAST:
-			ret = hclge_set_vf_uc_mac_addr(vport, req, true);
+			ret = hclge_set_vf_uc_mac_addr(vport, req);
 			if (ret)
 				dev_err(&hdev->pdev->dev,
 					"PF fail(%d) to set VF UC MAC Addr\n",

drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c

@@ -98,6 +98,8 @@ int hclgevf_send_mbx_msg(struct hclgevf_dev *hdev, u16 code, u16 subcode,
 	}
 
 	hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_VF_TO_PF, false);
+	req->mbx_need_resp |= need_resp ? HCLGE_MBX_NEED_RESP_BIT :
+					  ~HCLGE_MBX_NEED_RESP_BIT;
 	req->msg[0] = code;
 	req->msg[1] = subcode;
 	memcpy(&req->msg[2], msg_data, msg_len);