net/hns3: fix MTU config complexity

[ upstream commit d81d78e ]

This patch fixed cyclomatic complexity about MTU
in device configure process.

Fixes: 1f5ca0b ("net/hns3: support some device operations")

Signed-off-by: Min Hu (Connor) <humin29@huawei.com>

drivers/net/hns3/hns3_ethdev.c

@@ -2302,6 +2302,41 @@ hns3_init_ring_with_vector(struct hns3_hw *hw)
 	return 0;
 }
 
+static int
+hns3_refresh_mtu(struct rte_eth_dev *dev, struct rte_eth_conf *conf)
+{
+	struct hns3_adapter *hns = dev->data->dev_private;
+	struct hns3_hw *hw = &hns->hw;
+	uint32_t max_rx_pkt_len;
+	uint16_t mtu;
+	int ret;
+
+	if (!(conf->rxmode.offloads & DEV_RX_OFFLOAD_JUMBO_FRAME))
+		return 0;
+
+	/*
+	 * If jumbo frames are enabled, MTU needs to be refreshed
+	 * according to the maximum RX packet length.
+	 */
+	max_rx_pkt_len = conf->rxmode.max_rx_pkt_len;
+	if (max_rx_pkt_len > HNS3_MAX_FRAME_LEN ||
+	    max_rx_pkt_len <= HNS3_DEFAULT_FRAME_LEN) {
+		hns3_err(hw, "maximum Rx packet length must be greater than %u "
+			 "and no more than %u when jumbo frame enabled.",
+			 (uint16_t)HNS3_DEFAULT_FRAME_LEN,
+			 (uint16_t)HNS3_MAX_FRAME_LEN);
+		return -EINVAL;
+	}
+
+	mtu = (uint16_t)HNS3_PKTLEN_TO_MTU(max_rx_pkt_len);
+	ret = hns3_dev_mtu_set(dev, mtu);
+	if (ret)
+		return ret;
+	dev->data->mtu = mtu;
+
+	return 0;
+}
+
 static int
 hns3_dev_configure(struct rte_eth_dev *dev)
 {
@@ -2313,8 +2348,6 @@ hns3_dev_configure(struct rte_eth_dev *dev)
 	uint16_t nb_rx_q = dev->data->nb_rx_queues;
 	uint16_t nb_tx_q = dev->data->nb_tx_queues;
 	struct rte_eth_rss_conf rss_conf;
-	uint32_t max_rx_pkt_len;
-	uint16_t mtu;
 	bool gro_en;
 	int ret;
 
@@ -2367,28 +2400,9 @@ hns3_dev_configure(struct rte_eth_dev *dev)
 			goto cfg_err;
 	}
 
-	/*
-	 * If jumbo frames are enabled, MTU needs to be refreshed
-	 * according to the maximum RX packet length.
-	 */
-	if (conf->rxmode.offloads & DEV_RX_OFFLOAD_JUMBO_FRAME) {
-		max_rx_pkt_len = conf->rxmode.max_rx_pkt_len;
-		if (max_rx_pkt_len > HNS3_MAX_FRAME_LEN ||
-		    max_rx_pkt_len <= HNS3_DEFAULT_FRAME_LEN) {
-			hns3_err(hw, "maximum Rx packet length must be greater "
-				 "than %u and less than %u when jumbo frame enabled.",
-				 (uint16_t)HNS3_DEFAULT_FRAME_LEN,
-				 (uint16_t)HNS3_MAX_FRAME_LEN);
-			ret = -EINVAL;
-			goto cfg_err;
-		}
-
-		mtu = (uint16_t)HNS3_PKTLEN_TO_MTU(max_rx_pkt_len);
-		ret = hns3_dev_mtu_set(dev, mtu);
-		if (ret)
-			goto cfg_err;
-		dev->data->mtu = mtu;
-	}
+	ret = hns3_refresh_mtu(dev, conf);
+	if (ret)
+		goto cfg_err;
 
 	ret = hns3_dev_configure_vlan(dev);
 	if (ret)