21.02/files/target/linux/mediatek/patches-5.4/999-1713-v5.15-net-dsa-add-dsa_port_from_netdev.patch

From b80c745d2b90b30558e4f5b12060af956ae8e76d Mon Sep 17 00:00:00 2001
From: Bo Jiao <Bo.Jiao@mediatek.com>
Date: Mon, 18 Sep 2023 10:52:27 +0800
Subject: [PATCH] net dsa add dsa_port_from_netdev

---
 include/net/dsa.h                             |   10 +
 net/dsa/dsa.c                                 |    9 +
 net/dsa/slave.c                               |    1 +
  3 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index d29ee9e..43f65cb 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -562,6 +562,8 @@ struct dsa_switch_ops {
 					  struct sk_buff *skb);
 };
 
+struct dsa_port *dsa_port_from_netdev(struct net_device *netdev);
+
 struct dsa_switch_driver {
 	struct list_head	list;
 	const struct dsa_switch_ops *ops;
@@ -654,6 +656,14 @@ static inline int call_dsa_notifiers(unsigned long val, struct net_device *dev,
 #define BRCM_TAG_GET_PORT(v)		((v) >> 8)
 #define BRCM_TAG_GET_QUEUE(v)		((v) & 0xff)
 
+#if IS_ENABLED(CONFIG_NET_DSA)
+bool dsa_slave_dev_check(const struct net_device *dev);
+#else
+static inline bool dsa_slave_dev_check(const struct net_device *dev)
+{
+	return false;
+}
+#endif
 
 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev);
 int dsa_port_get_phy_strings(struct dsa_port *dp, uint8_t *data);
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index ca80f86..35a1249 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -329,6 +329,15 @@ int call_dsa_notifiers(unsigned long val, struct net_device *dev,
 }
 EXPORT_SYMBOL_GPL(call_dsa_notifiers);
 
+struct dsa_port *dsa_port_from_netdev(struct net_device *netdev)
+{
+	if (!netdev || !dsa_slave_dev_check(netdev))
+		return ERR_PTR(-ENODEV);
+
+	return dsa_slave_to_port(netdev);
+}
+EXPORT_SYMBOL_GPL(dsa_port_from_netdev);
+
 static int __init dsa_init_module(void)
 {
 	int rc;
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index e2b91b3..2dfaa1e 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1499,6 +1533,7 @@ bool dsa_slave_dev_check(const struct net_device *dev)
 {
 	return dev->netdev_ops == &dsa_slave_netdev_ops;
 }
+EXPORT_SYMBOL_GPL(dsa_slave_dev_check);
 
 static int dsa_slave_changeupper(struct net_device *dev,
 				 struct netdev_notifier_changeupper_info *info)
-- 
2.18.0