net/hns3: fix flushing multicast MAC address

[ upstream commit 49d1ab205b033b6131fb895b5e4d9ebc14081e51 ]

According rte_eth_dev_set_mc_addr_list() API definition,
support flush multicast MAC address if mc_addr_set is NULL
or nb_mc_addr is zero.

Fixes: 7d7f9f8 ("net/hns3: support MAC address related operations")

Signed-off-by: Dengdui Huang <huangdengdui@huawei.com>
Signed-off-by: Dongdong Liu <liudongdong3@huawei.com>

drivers/net/hns3/hns3_common.c

@@ -407,13 +407,23 @@ hns3_set_mc_mac_addr_list(struct rte_eth_dev *dev,
 			  uint32_t nb_mc_addr)
 {
 	struct hns3_hw *hw = HNS3_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct hns3_adapter *hns = HNS3_DEV_HW_TO_ADAPTER(hw);
 	struct rte_ether_addr *addr;
 	int cur_addr_num;
 	int set_addr_num;
 	int num;
 	int ret;
 	int i;
 
+	if (mc_addr_set == NULL || nb_mc_addr == 0) {
+		rte_spinlock_lock(&hw->lock);
+		ret = hns3_configure_all_mc_mac_addr(hns, true);
+		if (ret == 0)
+			hw->mc_addrs_num = 0;
+		rte_spinlock_unlock(&hw->lock);
+		return ret;
+	}
+
 	/* Check if input parameters are valid */
 	ret = hns3_set_mc_addr_chk_param(hw, mc_addr_set, nb_mc_addr);
 	if (ret)