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Date:   Sat, 19 Dec 2020 00:38:50 +0200
From:   Vladimir Oltean <>
To:     Florian Fainelli <>,
        "David S. Miller" <>,
        Jakub Kicinski <>, Andrew Lunn <>,
        Vivien Didelot <>,,
Subject: [RFC PATCH net-next 2/4] net: dsa: export dsa_slave_dev_check

Using the NETDEV_CHANGEUPPER notifications, drivers can be aware when
they are enslaved to e.g. a bridge by calling netif_is_bridge_master().

Export this helper from DSA to get the equivalent functionality of
determining whether the upper interface of a CHANGEUPPER notifier is a
DSA switch interface or not.

Signed-off-by: Vladimir Oltean <>
 include/net/dsa.h  | 6 ++++++
 net/dsa/dsa_priv.h | 1 -
 net/dsa/slave.c    | 1 +
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index af9a4f9ee764..5badfd6403c5 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -855,6 +855,7 @@ int register_dsa_notifier(struct notifier_block *nb);
 int unregister_dsa_notifier(struct notifier_block *nb);
 int call_dsa_notifiers(unsigned long val, struct net_device *dev,
 		       struct dsa_notifier_info *info);
+bool dsa_slave_dev_check(const struct net_device *dev);
 static inline int register_dsa_notifier(struct notifier_block *nb)
@@ -871,6 +872,11 @@ static inline int call_dsa_notifiers(unsigned long val, struct net_device *dev,
 	return NOTIFY_DONE;
+static inline bool dsa_slave_dev_check(const struct net_device *dev)
+	return false;
 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev);
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index 7c96aae9062c..33c082f10bb9 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -172,7 +172,6 @@ extern const struct dsa_device_ops notag_netdev_ops;
 void dsa_slave_mii_bus_init(struct dsa_switch *ds);
 int dsa_slave_create(struct dsa_port *dp);
 void dsa_slave_destroy(struct net_device *slave_dev);
-bool dsa_slave_dev_check(const struct net_device *dev);
 int dsa_slave_suspend(struct net_device *slave_dev);
 int dsa_slave_resume(struct net_device *slave_dev);
 int dsa_slave_register_notifier(void);
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 4a0498bf6c65..c01bc7ebeb14 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1924,6 +1924,7 @@ bool dsa_slave_dev_check(const struct net_device *dev)
 	return dev->netdev_ops == &dsa_slave_netdev_ops;
 static int dsa_slave_changeupper(struct net_device *dev,
 				 struct netdev_notifier_changeupper_info *info)

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