net/hns3: fix never set MAC flow control

[ upstream commit 2350eb39f337f9e8d798f8dd1d658834e3981e9e ]

When some hardware and firmware support speed auto-negotiation
but do not support flow control auto-negotiation, driver can
never successfully set MAC flow control by flow_ctrl_set() API.
So only tell user driver doesn't support flow control autoneg
when user enable it.

Fixes: 1f411e3 ("net/hns3: support flow control autoneg for copper port")

Signed-off-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Dongdong Liu <liudongdong3@huawei.com>

drivers/net/hns3/hns3_ethdev.c

@@ -5329,16 +5329,7 @@ hns3_check_fc_autoneg_valid(struct hns3_hw *hw, uint8_t autoneg)
 
 	if (!pf->support_fc_autoneg) {
 		if (autoneg != 0) {
-			hns3_err(hw, "unsupported fc auto-negotiation setting.");
-			return -EOPNOTSUPP;
-		}
-
-		/*
-		 * Flow control auto-negotiation of the NIC is not supported,
-		 * but other auto-negotiation features may be supported.
-		 */
-		if (autoneg != hw->mac.link_autoneg) {
-			hns3_err(hw, "please use 'link_speeds' in struct rte_eth_conf to disable autoneg!");
+			hns3_err(hw, "unsupported fc auto-negotiation.");
 			return -EOPNOTSUPP;
 		}