From: Jian Shen <shenjian15@huawei.com>
Date: Sun, 24 Apr 2022 20:57:25 +0800
Subject: net: hns3: add return value for mailbox handling in PF
Patch-mainline: v5.18-rc5
Git-commit: c59d606296842409a6e5a4828235b0bd46b12bc4
References: bsc#1190336

Currently, there are some querying mailboxes sent from VF to PF,
and VF will wait the PF's handling result. For mailbox
HCLGE_MBX_GET_QID_IN_PF and HCLGE_MBX_GET_RSS_KEY, it may fail
when the input parameter is invalid, but the prototype of their
handler function is void. In this case, PF always return success
to VF, which may cause the VF get incorrect result.

Fixes it by adding return value for these function.

Fixes: 63b1279d9905 ("net: hns3: check queue id range before using")
Fixes: 532cfc0df1e4 ("net: hns3: add a check for index in hclge_get_rss_key()")
Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@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 |   22 +++++++++--------
 1 file changed, 12 insertions(+), 10 deletions(-)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
@@ -586,9 +586,9 @@ static int hclge_set_vf_mtu(struct hclge
 	return hclge_set_vport_mtu(vport, mtu);
 }
 
-static void hclge_get_queue_id_in_pf(struct hclge_vport *vport,
-				     struct hclge_mbx_vf_to_pf_cmd *mbx_req,
-				     struct hclge_respond_to_vf_msg *resp_msg)
+static int hclge_get_queue_id_in_pf(struct hclge_vport *vport,
+				    struct hclge_mbx_vf_to_pf_cmd *mbx_req,
+				    struct hclge_respond_to_vf_msg *resp_msg)
 {
 	struct hnae3_handle *handle = &vport->nic;
 	struct hclge_dev *hdev = vport->back;
@@ -598,17 +598,18 @@ static void hclge_get_queue_id_in_pf(str
 	if (queue_id >= handle->kinfo.num_tqps) {
 		dev_err(&hdev->pdev->dev, "Invalid queue id(%u) from VF %u\n",
 			queue_id, mbx_req->mbx_src_vfid);
-		return;
+		return -EINVAL;
 	}
 
 	qid_in_pf = hclge_covert_handle_qid_global(&vport->nic, queue_id);
 	memcpy(resp_msg->data, &qid_in_pf, sizeof(qid_in_pf));
 	resp_msg->len = sizeof(qid_in_pf);
+	return 0;
 }
 
-static void hclge_get_rss_key(struct hclge_vport *vport,
-			      struct hclge_mbx_vf_to_pf_cmd *mbx_req,
-			      struct hclge_respond_to_vf_msg *resp_msg)
+static int hclge_get_rss_key(struct hclge_vport *vport,
+			     struct hclge_mbx_vf_to_pf_cmd *mbx_req,
+			     struct hclge_respond_to_vf_msg *resp_msg)
 {
 #define HCLGE_RSS_MBX_RESP_LEN	8
 	struct hclge_dev *hdev = vport->back;
@@ -624,13 +625,14 @@ static void hclge_get_rss_key(struct hcl
 		dev_warn(&hdev->pdev->dev,
 			 "failed to get the rss hash key, the index(%u) invalid !\n",
 			 index);
-		return;
+		return -EINVAL;
 	}
 
 	memcpy(resp_msg->data,
 	       &hdev->vport[0].rss_hash_key[index * HCLGE_RSS_MBX_RESP_LEN],
 	       HCLGE_RSS_MBX_RESP_LEN);
 	resp_msg->len = HCLGE_RSS_MBX_RESP_LEN;
+	return 0;
 }
 
 static void hclge_link_fail_parse(struct hclge_dev *hdev, u8 link_fail_code)
@@ -805,10 +807,10 @@ void hclge_mbx_handler(struct hclge_dev
 					"VF fail(%d) to set mtu\n", ret);
 			break;
 		case HCLGE_MBX_GET_QID_IN_PF:
-			hclge_get_queue_id_in_pf(vport, req, &resp_msg);
+			ret = hclge_get_queue_id_in_pf(vport, req, &resp_msg);
 			break;
 		case HCLGE_MBX_GET_RSS_KEY:
-			hclge_get_rss_key(vport, req, &resp_msg);
+			ret = hclge_get_rss_key(vport, req, &resp_msg);
 			break;
 		case HCLGE_MBX_GET_LINK_MODE:
 			hclge_get_link_mode(vport, req);