net: hns3: enable DCB when tc num is one and pfc_en is non-zero

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

Currently when tc num is one, the DCB will be disabled no matter if
pfc_en is non-zero or not.

This patch enables the DCB if pfc_en is non-zero, even when tc num
is one.

Feature or Bugfix:Bugfix
Signed-off-by: NYunsheng Lin <linyunsheng@huawei.com>
Reviewed-by: Nlipeng <lipeng321@huawei.com>
Reviewed-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

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

@@ -324,6 +324,9 @@ static int hclge_ieee_setpfc(struct hnae3_handle *h, struct ieee_pfc *pfc)
 
 	hdev->tm_info.hw_pfc_map = pfc_map;
 	hdev->tm_info.pfc_en = pfc->pfc_en;
+
+	hclge_tm_schd_info_update(hdev, hdev->tm_info.num_tc);
+
 	ret = hclge_pause_setup_hw(hdev, false);
 	if (ret)
 		return ret;

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

@@ -597,8 +597,10 @@ static void hclge_tm_tc_info_init(struct hclge_dev *hdev)
 		hdev->tm_info.prio_tc[i] =
 			(i >= hdev->tm_info.num_tc) ? 0 : i;
 
-	/* DCB is enabled if we have more than 1 TC */
-	if (hdev->tm_info.num_tc > 1)
+	/* DCB is enabled if we have more than 1 TC or pfc_en is
+	 * non-zero.
+	 */
+	if (hdev->tm_info.num_tc > 1 || hdev->tm_info.pfc_en)
 		hdev->flag |= HCLGE_FLAG_DCB_ENABLE;
 	else
 		hdev->flag &= ~HCLGE_FLAG_DCB_ENABLE;