The MAC can automatically send or respond to pause frames.
This patch supports the function of enabling pause frames
by using ethtool.

Signed-off-by: Jijie Shao <shaojijie@huawei.com>
---
ChangeLog:
v3 -> v4:
  - Support auto-neg pause, suggested by Andrew.
  v3: https://lore.kernel.org/all/20241111145558.1965325-1-shaojijie@huawei.com/
---
 .../ethernet/hisilicon/hibmcge/hbg_common.h   |  1 +
 .../ethernet/hisilicon/hibmcge/hbg_ethtool.c  | 22 +++++++++++++++++++
 .../net/ethernet/hisilicon/hibmcge/hbg_hw.c   | 13 +++++++++++
 .../net/ethernet/hisilicon/hibmcge/hbg_hw.h   |  2 ++
 .../net/ethernet/hisilicon/hibmcge/hbg_main.c |  1 +
 .../net/ethernet/hisilicon/hibmcge/hbg_mdio.c | 12 ++++++++++
 .../net/ethernet/hisilicon/hibmcge/hbg_reg.h  |  2 ++
 7 files changed, 53 insertions(+)

diff --git a/drivers/net/ethernet/hisilicon/hibmcge/hbg_common.h b/drivers/net/ethernet/hisilicon/hibmcge/hbg_common.h
index e071f77754fe..76b0b32bcb15 100644
--- a/drivers/net/ethernet/hisilicon/hibmcge/hbg_common.h
+++ b/drivers/net/ethernet/hisilicon/hibmcge/hbg_common.h
@@ -115,6 +115,7 @@ struct hbg_mac {
 	u32 duplex;
 	u32 autoneg;
 	u32 link_status;
+	u32 pause_autoneg;
 };
 
 struct hbg_mac_table_entry {
diff --git a/drivers/net/ethernet/hisilicon/hibmcge/hbg_ethtool.c b/drivers/net/ethernet/hisilicon/hibmcge/hbg_ethtool.c
index e7f169d2abb7..767201977e2b 100644
--- a/drivers/net/ethernet/hisilicon/hibmcge/hbg_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hibmcge/hbg_ethtool.c
@@ -143,12 +143,34 @@ static void hbg_ethtool_get_regs(struct net_device *netdev,
 	}
 }
 
+static void hbg_ethtool_get_pauseparam(struct net_device *net_dev,
+				       struct ethtool_pauseparam *param)
+{
+	struct hbg_priv *priv = netdev_priv(net_dev);
+
+	param->autoneg = priv->mac.pause_autoneg;
+	phy_get_pause(priv->mac.phydev,
+		      (bool *)&param->tx_pause, (bool *)&param->rx_pause);
+}
+
+static int hbg_ethtool_set_pauseparam(struct net_device *net_dev,
+				      struct ethtool_pauseparam *param)
+{
+	struct hbg_priv *priv = netdev_priv(net_dev);
+
+	priv->mac.pause_autoneg = param->autoneg;
+	phy_set_asym_pause(priv->mac.phydev, param->rx_pause, param->tx_pause);
+	return 0;
+}
+
 static const struct ethtool_ops hbg_ethtool_ops = {
 	.get_link		= ethtool_op_get_link,
 	.get_link_ksettings	= phy_ethtool_get_link_ksettings,
 	.set_link_ksettings	= phy_ethtool_set_link_ksettings,
 	.get_regs_len		= hbg_ethtool_get_regs_len,
 	.get_regs		= hbg_ethtool_get_regs,
+	.get_pauseparam         = hbg_ethtool_get_pauseparam,
+	.set_pauseparam         = hbg_ethtool_set_pauseparam,
 };
 
 void hbg_ethtool_set_ops(struct net_device *netdev)
diff --git a/drivers/net/ethernet/hisilicon/hibmcge/hbg_hw.c b/drivers/net/ethernet/hisilicon/hibmcge/hbg_hw.c
index 29d66a0ea0a6..e9270d499bd0 100644
--- a/drivers/net/ethernet/hisilicon/hibmcge/hbg_hw.c
+++ b/drivers/net/ethernet/hisilicon/hibmcge/hbg_hw.c
@@ -220,6 +220,19 @@ void hbg_hw_set_mac_filter_enable(struct hbg_priv *priv, u32 enable)
 			    HBG_REG_REC_FILT_CTRL_UC_MATCH_EN_B, enable);
 }
 
+void hbg_hw_set_pause_enable(struct hbg_priv *priv, u32 tx_en, u32 rx_en)
+{
+	hbg_reg_write_field(priv, HBG_REG_PAUSE_ENABLE_ADDR,
+			    HBG_REG_PAUSE_ENABLE_TX_B, tx_en);
+	hbg_reg_write_field(priv, HBG_REG_PAUSE_ENABLE_ADDR,
+			    HBG_REG_PAUSE_ENABLE_RX_B, rx_en);
+}
+
+void hbg_hw_set_rx_pause_mac_addr(struct hbg_priv *priv, u64 mac_addr)
+{
+	hbg_reg_write64(priv, HBG_REG_FD_FC_ADDR_LOW_ADDR, mac_addr);
+}
+
 static void hbg_hw_init_transmit_ctrl(struct hbg_priv *priv)
 {
 	u32 ctrl = 0;
diff --git a/drivers/net/ethernet/hisilicon/hibmcge/hbg_hw.h b/drivers/net/ethernet/hisilicon/hibmcge/hbg_hw.h
index 6eb4b7d2cba8..e52c5972c488 100644
--- a/drivers/net/ethernet/hisilicon/hibmcge/hbg_hw.h
+++ b/drivers/net/ethernet/hisilicon/hibmcge/hbg_hw.h
@@ -56,5 +56,7 @@ u32 hbg_hw_get_fifo_used_num(struct hbg_priv *priv, enum hbg_dir dir);
 void hbg_hw_set_tx_desc(struct hbg_priv *priv, struct hbg_tx_desc *tx_desc);
 void hbg_hw_fill_buffer(struct hbg_priv *priv, u32 buffer_dma_addr);
 void hbg_hw_set_mac_filter_enable(struct hbg_priv *priv, u32 enable);
+void hbg_hw_set_pause_enable(struct hbg_priv *priv, u32 tx_en, u32 rx_en);
+void hbg_hw_set_rx_pause_mac_addr(struct hbg_priv *priv, u64 mac_addr);
 
 #endif
diff --git a/drivers/net/ethernet/hisilicon/hibmcge/hbg_main.c b/drivers/net/ethernet/hisilicon/hibmcge/hbg_main.c
index 0ad03681b706..a45a63856e61 100644
--- a/drivers/net/ethernet/hisilicon/hibmcge/hbg_main.c
+++ b/drivers/net/ethernet/hisilicon/hibmcge/hbg_main.c
@@ -204,6 +204,7 @@ static int hbg_net_set_mac_address(struct net_device *netdev, void *addr)
 	if (is_exists)
 		hbg_set_mac_to_mac_table(priv, index, NULL);
 
+	hbg_hw_set_rx_pause_mac_addr(priv, ether_addr_to_u64(mac_addr));
 	dev_addr_set(netdev, mac_addr);
 	return 0;
 }
diff --git a/drivers/net/ethernet/hisilicon/hibmcge/hbg_mdio.c b/drivers/net/ethernet/hisilicon/hibmcge/hbg_mdio.c
index a3479fba8501..dc65c798d7ed 100644
--- a/drivers/net/ethernet/hisilicon/hibmcge/hbg_mdio.c
+++ b/drivers/net/ethernet/hisilicon/hibmcge/hbg_mdio.c
@@ -114,6 +114,16 @@ static void hbg_mdio_init_hw(struct hbg_priv *priv)
 	hbg_mdio_set_command(mac, cmd);
 }
 
+static void hbg_flowctrl_cfg(struct hbg_priv *priv)
+{
+	struct phy_device *phydev = priv->mac.phydev;
+	bool rx_pause;
+	bool tx_pause;
+
+	phy_get_pause(phydev, &tx_pause, &rx_pause);
+	hbg_hw_set_pause_enable(priv, tx_pause, rx_pause);
+}
+
 static void hbg_phy_adjust_link(struct net_device *netdev)
 {
 	struct hbg_priv *priv = netdev_priv(netdev);
@@ -140,6 +150,7 @@ static void hbg_phy_adjust_link(struct net_device *netdev)
 			priv->mac.duplex = phydev->duplex;
 			priv->mac.autoneg = phydev->autoneg;
 			hbg_hw_adjust_link(priv, speed, phydev->duplex);
+			hbg_flowctrl_cfg(priv);
 		}
 
 		priv->mac.link_status = phydev->link;
@@ -168,6 +179,7 @@ static int hbg_phy_connect(struct hbg_priv *priv)
 		return ret;
 
 	phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_1000baseT_Half_BIT);
+	phy_support_asym_pause(phydev);
 	phy_attached_info(phydev);
 
 	return 0;
diff --git a/drivers/net/ethernet/hisilicon/hibmcge/hbg_reg.h b/drivers/net/ethernet/hisilicon/hibmcge/hbg_reg.h
index 665666712c7c..f12efc12f3c5 100644
--- a/drivers/net/ethernet/hisilicon/hibmcge/hbg_reg.h
+++ b/drivers/net/ethernet/hisilicon/hibmcge/hbg_reg.h
@@ -51,6 +51,8 @@
 #define HBG_REG_PORT_ENABLE_RX_B		BIT(1)
 #define HBG_REG_PORT_ENABLE_TX_B		BIT(2)
 #define HBG_REG_PAUSE_ENABLE_ADDR		(HBG_REG_SGMII_BASE + 0x0048)
+#define HBG_REG_PAUSE_ENABLE_RX_B		BIT(0)
+#define HBG_REG_PAUSE_ENABLE_TX_B		BIT(1)
 #define HBG_REG_AN_NEG_STATE_ADDR		(HBG_REG_SGMII_BASE + 0x0058)
 #define HBG_REG_TRANSMIT_CTRL_ADDR		(HBG_REG_SGMII_BASE + 0x0060)
 #define HBG_REG_TRANSMIT_CTRL_PAD_EN_B		BIT(7)
-- 
2.33.0