net: hns3: fix PFC not setting problem for DCB module

The PFC enabling is based on user priority, currently it is
based on TC, which may cause PFC not setting correctly when pri
to TC mapping is not one to one relation.

This patch adds pfc_en in tm_info to fix it.

Fixes: cacde272 ("net: hns3: Add hclge_dcb module for the support of DCB feature")
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -296,6 +296,9 @@ static int hclge_ieee_setpfc(struct hnae3_handle *h, struct ieee_pfc *pfc)
 	    hdev->flag & HCLGE_FLAG_MQPRIO_ENABLE)
 		return -EINVAL;
 
+	if (pfc->pfc_en == hdev->tm_info.pfc_en)
+		return 0;
+
 	prio_tc = hdev->tm_info.prio_tc;
 	pfc_map = 0;
 
@@ -308,10 +311,8 @@ static int hclge_ieee_setpfc(struct hnae3_handle *h, struct ieee_pfc *pfc)
 		}
 	}
 
-	if (pfc_map == hdev->tm_info.hw_pfc_map)
-		return 0;
-
 	hdev->tm_info.hw_pfc_map = pfc_map;
+	hdev->tm_info.pfc_en = pfc->pfc_en;
 
 	return hclge_pause_setup_hw(hdev, false);
 }

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h

@@ -325,6 +325,7 @@ struct hclge_tm_info {
 	struct hclge_tc_info tc_info[HNAE3_MAX_TC];
 	enum hclge_fc_mode fc_mode;
 	u8 hw_pfc_map; /* Allow for packet drop or not on this TC */
+	u8 pfc_en;	/* PFC enabled or not for user priority */
 };
 
 struct hclge_comm_stats_str {

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

@@ -1215,7 +1215,7 @@ static int hclge_pfc_setup_hw(struct hclge_dev *hdev)
 				HCLGE_RX_MAC_PAUSE_EN_MSK;
 
 	return hclge_pfc_pause_en_cfg(hdev, enable_bitmap,
-				      hdev->tm_info.hw_pfc_map);
+				      hdev->tm_info.pfc_en);
 }
 
 /* Each Tc has a 1024 queue sets to backpress, it divides to