net: hns3: refactor out hclgevf_get_rss_tuple()

To improve code readability and maintainability, separate
the flow type parsing part and the converting part from
bloated hclgevf_get_rss_tuple().
Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c

@@ -954,56 +954,73 @@ static int hclgevf_set_rss_tuple(struct hnae3_handle *handle,
 	return 0;
 }
 
-static int hclgevf_get_rss_tuple(struct hnae3_handle *handle,
-				 struct ethtool_rxnfc *nfc)
+static int hclgevf_get_rss_tuple_by_flow_type(struct hclgevf_dev *hdev,
+					      int flow_type, u8 *tuple_sets)
 {
-	struct hclgevf_dev *hdev = hclgevf_ae_get_hdev(handle);
-	struct hclgevf_rss_cfg *rss_cfg = &hdev->rss_cfg;
-	u8 tuple_sets;
-
-	if (hdev->ae_dev->dev_version < HNAE3_DEVICE_VERSION_V2)
-		return -EOPNOTSUPP;
-
-	nfc->data = 0;
-
-	switch (nfc->flow_type) {
+	switch (flow_type) {
 	case TCP_V4_FLOW:
-		tuple_sets = rss_cfg->rss_tuple_sets.ipv4_tcp_en;
+		*tuple_sets = hdev->rss_cfg.rss_tuple_sets.ipv4_tcp_en;
 		break;
 	case UDP_V4_FLOW:
-		tuple_sets = rss_cfg->rss_tuple_sets.ipv4_udp_en;
+		*tuple_sets = hdev->rss_cfg.rss_tuple_sets.ipv4_udp_en;
 		break;
 	case TCP_V6_FLOW:
-		tuple_sets = rss_cfg->rss_tuple_sets.ipv6_tcp_en;
+		*tuple_sets = hdev->rss_cfg.rss_tuple_sets.ipv6_tcp_en;
 		break;
 	case UDP_V6_FLOW:
-		tuple_sets = rss_cfg->rss_tuple_sets.ipv6_udp_en;
+		*tuple_sets = hdev->rss_cfg.rss_tuple_sets.ipv6_udp_en;
 		break;
 	case SCTP_V4_FLOW:
-		tuple_sets = rss_cfg->rss_tuple_sets.ipv4_sctp_en;
+		*tuple_sets = hdev->rss_cfg.rss_tuple_sets.ipv4_sctp_en;
 		break;
 	case SCTP_V6_FLOW:
-		tuple_sets = rss_cfg->rss_tuple_sets.ipv6_sctp_en;
+		*tuple_sets = hdev->rss_cfg.rss_tuple_sets.ipv6_sctp_en;
 		break;
 	case IPV4_FLOW:
 	case IPV6_FLOW:
-		tuple_sets = HCLGEVF_S_IP_BIT | HCLGEVF_D_IP_BIT;
+		*tuple_sets = HCLGEVF_S_IP_BIT | HCLGEVF_D_IP_BIT;
 		break;
 	default:
 		return -EINVAL;
 	}
 
-	if (!tuple_sets)
 	return 0;
+}
+
+static u64 hclgevf_convert_rss_tuple(u8 tuple_sets)
+{
+	u64 tuple_data = 0;
 
 	if (tuple_sets & HCLGEVF_D_PORT_BIT)
-		nfc->data |= RXH_L4_B_2_3;
+		tuple_data |= RXH_L4_B_2_3;
 	if (tuple_sets & HCLGEVF_S_PORT_BIT)
-		nfc->data |= RXH_L4_B_0_1;
+		tuple_data |= RXH_L4_B_0_1;
 	if (tuple_sets & HCLGEVF_D_IP_BIT)
-		nfc->data |= RXH_IP_DST;
+		tuple_data |= RXH_IP_DST;
 	if (tuple_sets & HCLGEVF_S_IP_BIT)
-		nfc->data |= RXH_IP_SRC;
+		tuple_data |= RXH_IP_SRC;
+
+	return tuple_data;
+}
+
+static int hclgevf_get_rss_tuple(struct hnae3_handle *handle,
+				 struct ethtool_rxnfc *nfc)
+{
+	struct hclgevf_dev *hdev = hclgevf_ae_get_hdev(handle);
+	u8 tuple_sets;
+	int ret;
+
+	if (hdev->ae_dev->dev_version < HNAE3_DEVICE_VERSION_V2)
+		return -EOPNOTSUPP;
+
+	nfc->data = 0;
+
+	ret = hclgevf_get_rss_tuple_by_flow_type(hdev, nfc->flow_type,
+						 &tuple_sets);
+	if (ret || !tuple_sets)
+		return ret;
+
+	nfc->data = hclgevf_convert_rss_tuple(tuple_sets);
 
 	return 0;
 }