From: Yunsheng Lin <linyunsheng@huawei.com>
Date: Tue, 14 Aug 2018 17:13:16 +0100
Subject: net: hns3: Fix desc num set to default when setting channel
Patch-mainline: v4.19-rc1
Git-commit: 128b900de7df567ca7ca063bf5da4ed0f357db8c
References: bsc#1104353 FATE#326415

When user set the channel num using "ethtool -L ethX", the desc num
of BD will set to default value, which will cause desc num set by
user lost problem.

This patch fixes it by restoring the desc num set by user when setting
channel num.

Fixes: 09f2af6405b8 ("net: hns3: add support to modify tqps number")
Signed-off-by: Yunsheng Lin <linyunsheng@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>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c |   22 ++++++++--------
 1 file changed, 12 insertions(+), 10 deletions(-)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -1268,35 +1268,37 @@ static int hclge_map_tqps_to_func(struct
 	return ret;
 }
 
-static int  hclge_assign_tqp(struct hclge_vport *vport,
-			     struct hnae3_queue **tqp, u16 num_tqps)
+static int  hclge_assign_tqp(struct hclge_vport *vport)
 {
+	struct hnae3_knic_private_info *kinfo = &vport->nic.kinfo;
 	struct hclge_dev *hdev = vport->back;
 	int i, alloced;
 
 	for (i = 0, alloced = 0; i < hdev->num_tqps &&
-	     alloced < num_tqps; i++) {
+	     alloced < kinfo->num_tqps; i++) {
 		if (!hdev->htqp[i].alloced) {
 			hdev->htqp[i].q.handle = &vport->nic;
 			hdev->htqp[i].q.tqp_index = alloced;
-			tqp[alloced] = &hdev->htqp[i].q;
+			hdev->htqp[i].q.desc_num = kinfo->num_desc;
+			kinfo->tqp[alloced] = &hdev->htqp[i].q;
 			hdev->htqp[i].alloced = true;
 			alloced++;
 		}
 	}
-	vport->alloc_tqps = num_tqps;
+	vport->alloc_tqps = kinfo->num_tqps;
 
 	return 0;
 }
 
-static int hclge_knic_setup(struct hclge_vport *vport, u16 num_tqps)
+static int hclge_knic_setup(struct hclge_vport *vport,
+			    u16 num_tqps, u16 num_desc)
 {
 	struct hnae3_handle *nic = &vport->nic;
 	struct hnae3_knic_private_info *kinfo = &nic->kinfo;
 	struct hclge_dev *hdev = vport->back;
 	int i, ret;
 
-	kinfo->num_desc = hdev->num_desc;
+	kinfo->num_desc = num_desc;
 	kinfo->rx_buf_len = hdev->rx_buf_len;
 	kinfo->num_tc = min_t(u16, num_tqps, hdev->tm_info.num_tc);
 	kinfo->rss_size
@@ -1323,7 +1325,7 @@ static int hclge_knic_setup(struct hclge
 	if (!kinfo->tqp)
 		return -ENOMEM;
 
-	ret = hclge_assign_tqp(vport, kinfo->tqp, kinfo->num_tqps);
+	ret = hclge_assign_tqp(vport);
 	if (ret)
 		dev_err(&hdev->pdev->dev, "fail to assign TQPs %d.\n", ret);
 
@@ -1389,7 +1391,7 @@ static int hclge_vport_setup(struct hclg
 	nic->numa_node_mask = hdev->numa_node_mask;
 
 	if (hdev->ae_dev->dev_type == HNAE3_DEV_KNIC) {
-		ret = hclge_knic_setup(vport, num_tqps);
+		ret = hclge_knic_setup(vport, num_tqps, hdev->num_desc);
 		if (ret) {
 			dev_err(&hdev->pdev->dev, "knic setup failed %d\n",
 				ret);
@@ -5885,7 +5887,7 @@ static int hclge_set_channels(struct hna
 	/* Free old tqps, and reallocate with new tqp number when nic setup */
 	hclge_release_tqp(vport);
 
-	ret = hclge_knic_setup(vport, new_tqps_num);
+	ret = hclge_knic_setup(vport, new_tqps_num, kinfo->num_desc);
 	if (ret) {
 		dev_err(&hdev->pdev->dev, "setup nic fail, ret =%d\n", ret);
 		return ret;