From: Huazhong Tan <tanhuazhong@huawei.com>
Date: Thu, 20 Dec 2018 11:52:02 +0800
Subject: net: hns3: reset tqp while doing DOWN operation
Patch-mainline: v5.0-rc1
Git-commit: 39cfbc9c4fc4a2888548c2624789e42e3f775721
References: bsc#1104353 FATE#326415

While doing DOWN operation, the driver will reclaim the memory which has
already used for TX. If the hardware is processing this memory, it will
cause a RCB error to the hardware. According the hardware's description,
the driver should reset the tqp before reclaim the memory during DOWN.

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>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c   |    4 ++++
 drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c |    4 ++++
 2 files changed, 8 insertions(+)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -5331,6 +5331,7 @@ static void hclge_ae_stop(struct hnae3_h
 {
 	struct hclge_vport *vport = hclge_get_vport(handle);
 	struct hclge_dev *hdev = vport->back;
+	int i;
 
 	set_bit(HCLGE_STATE_DOWN, &hdev->state);
 
@@ -5343,6 +5344,9 @@ static void hclge_ae_stop(struct hnae3_h
 		return;
 	}
 
+	for (i = 0; i < handle->kinfo.num_tqps; i++)
+		hclge_reset_tqp(handle, i);
+
 	/* Mac disable */
 	hclge_cfg_mac_mode(hdev, false);
 
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
@@ -1870,9 +1870,13 @@ static int hclgevf_ae_start(struct hnae3
 static void hclgevf_ae_stop(struct hnae3_handle *handle)
 {
 	struct hclgevf_dev *hdev = hclgevf_ae_get_hdev(handle);
+	int i;
 
 	set_bit(HCLGEVF_STATE_DOWN, &hdev->state);
 
+	for (i = 0; i < handle->kinfo.num_tqps; i++)
+		hclgevf_reset_tqp(handle, i);
+
 	/* reset tqp stats */
 	hclgevf_reset_tqp_stats(handle);
 	hclgevf_update_link_status(hdev, 0);