net: hns3: add tx push support in hns3 ring param process

This patch adds tx push param to hns3 ring param and adapts the set and get
API of ring params. So users can set it by cmd ethtool -G and get it by cmd
ethtool -g.
Signed-off-by: Jie Wang <wangjie125@huawei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c

@@ -664,6 +664,8 @@ static void hns3_get_ringparam(struct net_device *netdev,
 	param->tx_pending = priv->ring[0].desc_num;
 	param->rx_pending = priv->ring[rx_queue_index].desc_num;
 	kernel_param->rx_buf_len = priv->ring[rx_queue_index].buf_size;
+	kernel_param->tx_push = test_bit(HNS3_NIC_STATE_TX_PUSH_ENABLE,
+					 &priv->state);
 }
 
 static void hns3_get_pauseparam(struct net_device *netdev,
@@ -1120,6 +1122,30 @@ static int hns3_change_rx_buf_len(struct net_device *ndev, u32 rx_buf_len)
 	return 0;
 }
 
+static int hns3_set_tx_push(struct net_device *netdev, u32 tx_push)
+{
+	struct hns3_nic_priv *priv = netdev_priv(netdev);
+	struct hnae3_handle *h = hns3_get_handle(netdev);
+	struct hnae3_ae_dev *ae_dev = pci_get_drvdata(h->pdev);
+	u32 old_state = test_bit(HNS3_NIC_STATE_TX_PUSH_ENABLE, &priv->state);
+
+	if (!test_bit(HNAE3_DEV_SUPPORT_TX_PUSH_B, ae_dev->caps) && tx_push)
+		return -EOPNOTSUPP;
+
+	if (tx_push == old_state)
+		return 0;
+
+	netdev_dbg(netdev, "Changing tx push from %s to %s\n",
+		   old_state ? "on" : "off", tx_push ? "on" : "off");
+
+	if (tx_push)
+		set_bit(HNS3_NIC_STATE_TX_PUSH_ENABLE, &priv->state);
+	else
+		clear_bit(HNS3_NIC_STATE_TX_PUSH_ENABLE, &priv->state);
+
+	return 0;
+}
+
 static int hns3_set_ringparam(struct net_device *ndev,
 			      struct ethtool_ringparam *param,
 			      struct kernel_ethtool_ringparam *kernel_param,
@@ -1139,6 +1165,10 @@ static int hns3_set_ringparam(struct net_device *ndev,
 	if (ret)
 		return ret;
 
+	ret = hns3_set_tx_push(ndev, kernel_param->tx_push);
+	if (ret)
+		return ret;
+
 	/* Hardware requires that its descriptors must be multiple of eight */
 	new_tx_desc_num = ALIGN(param->tx_pending, HNS3_RING_BD_MULTIPLE);
 	new_rx_desc_num = ALIGN(param->rx_pending, HNS3_RING_BD_MULTIPLE);
@@ -1858,7 +1888,8 @@ static int hns3_set_tunable(struct net_device *netdev,
 				 ETHTOOL_COALESCE_MAX_FRAMES |		\
 				 ETHTOOL_COALESCE_USE_CQE)
 
-#define HNS3_ETHTOOL_RING	ETHTOOL_RING_USE_RX_BUF_LEN
+#define HNS3_ETHTOOL_RING	(ETHTOOL_RING_USE_RX_BUF_LEN |		\
+				 ETHTOOL_RING_USE_TX_PUSH)
 
 static int hns3_get_ts_info(struct net_device *netdev,
 			    struct ethtool_ts_info *info)