From: Jian Shen <shenjian15@huawei.com>
Date: Wed, 18 Mar 2020 11:57:05 +0800
Subject: net: hns3: add a conversion for mailbox's response code
Patch-mainline: v5.7-rc1
Git-commit: 027fd5316005fd524d963fe879d5bf24eee2ab85
References: jsc#SLE-14777

Currently, when mailbox handling fails, the PF driver
just responds 1 to the VF driver. It is not sufficient
for the VF driver to find out why its mailbox fails.

So the error should be responded to VF, but the error
is type int and the response field in struct
hclge_mbx_pf_to_vf_cmd is type u16, a conversion is
needed.

Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c   |   16 ++++++++++++++-
 drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c |    7 +++++-
 2 files changed, 21 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
@@ -5,6 +5,11 @@
 #include "hclge_mbx.h"
 #include "hnae3.h"
 
+static u16 hclge_errno_to_resp(int errno)
+{
+	return abs(errno);
+}
+
 /* hclge_gen_resp_to_vf: used to generate a synchronous response to VF when PF
  * receives a mailbox message from VF.
  * @vport: pointer to struct hclge_vport
@@ -21,6 +26,7 @@ static int hclge_gen_resp_to_vf(struct h
 	struct hclge_dev *hdev = vport->back;
 	enum hclge_cmd_status status;
 	struct hclge_desc desc;
+	u16 resp;
 
 	resp_pf_to_vf = (struct hclge_mbx_pf_to_vf_cmd *)desc.data;
 
@@ -43,7 +49,15 @@ static int hclge_gen_resp_to_vf(struct h
 	resp_pf_to_vf->msg[0] = HCLGE_MBX_PF_VF_RESP;
 	resp_pf_to_vf->msg[1] = vf_to_pf_req->msg[0];
 	resp_pf_to_vf->msg[2] = vf_to_pf_req->msg[1];
-	resp_pf_to_vf->msg[3] = (resp_status == 0) ? 0 : 1;
+	resp = hclge_errno_to_resp(resp_status);
+	if (resp < SHRT_MAX) {
+		resp_pf_to_vf->msg[3] = resp;
+	} else {
+		dev_warn(&hdev->pdev->dev,
+			 "failed to send response to VF, response status %d is out-of-bound\n",
+			 resp);
+		resp_pf_to_vf->msg[3] = EIO;
+	}
 
 	if (resp_data && resp_data_len > 0)
 		memcpy(&resp_pf_to_vf->msg[4], resp_data, resp_data_len);
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c
@@ -5,6 +5,11 @@
 #include "hclgevf_main.h"
 #include "hnae3.h"
 
+static int hclgevf_resp_to_errno(u16 resp_code)
+{
+	return resp_code ? -resp_code : 0;
+}
+
 static void hclgevf_reset_mbx_resp_status(struct hclgevf_dev *hdev)
 {
 	/* this function should be called with mbx_resp.mbx_mutex held
@@ -193,7 +198,7 @@ void hclgevf_mbx_handler(struct hclgevf_
 
 			resp->origin_mbx_msg = (req->msg[1] << 16);
 			resp->origin_mbx_msg |= req->msg[2];
-			resp->resp_status = req->msg[3];
+			resp->resp_status = hclgevf_resp_to_errno(req->msg[3]);
 
 			temp = (u8 *)&req->msg[4];
 			for (i = 0; i < HCLGE_MBX_MAX_RESP_DATA_SIZE; i++) {