net: dsa: Allow compiling out legacy support

Introduce a configuration option: CONFIG_NET_DSA_LEGACY allowing to compile out
support for the old platform device and Device Tree binding registration.
Support for these configurations is scheduled to be removed in 4.17.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 40 insertions, 21 deletions

diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
index 03c3bdf25468..bbf2c82cf7b2 100644
--- a/net/dsa/Kconfig
+++ b/net/dsa/Kconfig
@@ -16,6 +16,15 @@ config NET_DSA
 
 if NET_DSA
 
+config NET_DSA_LEGACY
+	bool "Support for older platform device and Device Tree registration"
+	default y
+	---help---
+	  Say Y if you want to enable support for the older platform device and
+	  deprecated Device Tree binding registration.
+
+	  This feature is scheduled for removal in 4.17.
+
 # tagging formats
 config NET_DSA_TAG_BRCM
 	bool
diff --git a/net/dsa/Makefile b/net/dsa/Makefile
index 0e13c1f95d13..9e4d3536f977 100644
--- a/net/dsa/Makefile
+++ b/net/dsa/Makefile
@@ -1,7 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0
 # the core
 obj-$(CONFIG_NET_DSA) += dsa_core.o
-dsa_core-y += dsa.o dsa2.o legacy.o master.o port.o slave.o switch.o
+dsa_core-y += dsa.o dsa2.o master.o port.o slave.o switch.o
+dsa_core-$(CONFIG_NET_DSA_LEGACY) += legacy.o
 
 # tagging formats
 dsa_core-$(CONFIG_NET_DSA_TAG_BRCM) += tag_brcm.o
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index 7d036696e8c4..b03665e8fb4e 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -97,8 +97,17 @@ const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol);
 bool dsa_schedule_work(struct work_struct *work);
 
 /* legacy.c */
+#if IS_ENABLED(CONFIG_NET_DSA_LEGACY)
 int dsa_legacy_register(void);
 void dsa_legacy_unregister(void);
+#else
+static inline int dsa_legacy_register(void)
+{
+	return -ENODEV;
+}
+
+static inline void dsa_legacy_unregister(void) { }
+#endif
 int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 		       struct net_device *dev,
 		       const unsigned char *addr, u16 vid,
diff --git a/net/dsa/legacy.c b/net/dsa/legacy.c
index 84611d7fcfa2..aa56d3fb5da4 100644
--- a/net/dsa/legacy.c
+++ b/net/dsa/legacy.c
@@ -718,26 +718,6 @@ static int dsa_resume(struct device *d)
 }
 #endif
 
-/* legacy way, bypassing the bridge *****************************************/
-int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
-		       struct net_device *dev,
-		       const unsigned char *addr, u16 vid,
-		       u16 flags)
-{
-	struct dsa_port *dp = dsa_slave_to_port(dev);
-
-	return dsa_port_fdb_add(dp, addr, vid);
-}
-
-int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
-		       struct net_device *dev,
-		       const unsigned char *addr, u16 vid)
-{
-	struct dsa_port *dp = dsa_slave_to_port(dev);
-
-	return dsa_port_fdb_del(dp, addr, vid);
-}
-
 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
 
 static const struct of_device_id dsa_of_match_table[] = {
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 895db05d8c82..5d6475a6cc5d 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -941,6 +941,26 @@ static const struct ethtool_ops dsa_slave_ethtool_ops = {
 	.set_rxnfc		= dsa_slave_set_rxnfc,
 };
 
+/* legacy way, bypassing the bridge *****************************************/
+int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
+		       struct net_device *dev,
+		       const unsigned char *addr, u16 vid,
+		       u16 flags)
+{
+	struct dsa_port *dp = dsa_slave_to_port(dev);
+
+	return dsa_port_fdb_add(dp, addr, vid);
+}
+
+int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
+		       struct net_device *dev,
+		       const unsigned char *addr, u16 vid)
+{
+	struct dsa_port *dp = dsa_slave_to_port(dev);
+
+	return dsa_port_fdb_del(dp, addr, vid);
+}
+
 static const struct net_device_ops dsa_slave_netdev_ops = {
 	.ndo_open	 	= dsa_slave_open,
 	.ndo_stop		= dsa_slave_close,