[PATCH net-next 14/18] switchdev: add new swdev_port_bridge_getlink

[sfeldma@gmail.com]

From: Scott Feldman <sfeldma@gmail.com>

Like bridge_setlink, add swdev wrapper to handle bridge_getlink and call into
port driver to get port attrs.  For now, only BR_LEARNING and BR_LEARNING_SYNC
are returned.  To add more, we'll probably want to break away from
ndo_dflt_bridge_getlink() and build the netlink skb directly in the swdev code.

Signed-off-by: Scott Feldman <sfeldma@gmail.com>
---
 include/net/switchdev.h   |    9 +++++++++
 net/switchdev/switchdev.c |   27 +++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index 97196ab..bf77f66 100644
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -86,6 +86,8 @@ netdev_switch_notifier_info_to_dev(const struct netdev_switch_notifier_info *inf
 
 int swdev_port_attr_get(struct net_device *dev, struct swdev_attr *attr);
 int swdev_port_attr_set(struct net_device *dev, struct swdev_attr *attr);
+int swdev_port_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
+			      struct net_device *dev, u32 filter_mask);
 int swdev_port_bridge_setlink(struct net_device *dev, struct nlmsghdr *nlh,
 			      u16 flags);
 int register_netdev_switch_notifier(struct notifier_block *nb);
@@ -112,6 +114,13 @@ static inline int swdev_port_attr_set(struct net_device *dev,
 	return -EOPNOTSUPP;
 }
 
+static inline int swdev_port_bridge_getlink(struct sk_buff *skb, u32 pid,
+					    u32 seq, struct net_device *dev,
+					    u32 filter_mask)
+{
+	return -EOPNOTSUPP;
+}
+
 static inline int swdev_port_bridge_setlink(struct net_device *dev,
 					    struct nlmsghdr *nlh, u16 flags)
 {
diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
index 8a07096..d681931 100644
--- a/net/switchdev/switchdev.c
+++ b/net/switchdev/switchdev.c
@@ -173,6 +173,33 @@ int call_netdev_switch_notifiers(unsigned long val, struct net_device *dev,
 }
 EXPORT_SYMBOL_GPL(call_netdev_switch_notifiers);
 
+/**
+ *	swdev_port_bridge_getlink - Get bridge port attributes
+ *
+ *	@dev: port device
+ *
+ *	Called for SELF on rtnl_bridge_getlink to get bridge port
+ *	attributes.
+ */
+int swdev_port_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
+			      struct net_device *dev, u32 filter_mask)
+{
+	struct swdev_attr attr = {
+		.attr = SWDEV_ATTR_PORT_BRIDGE_FLAGS,
+	};
+	u16 mode = BRIDGE_MODE_UNDEF;
+	u32 mask = BR_LEARNING | BR_LEARNING_SYNC;
+	int err;
+
+	err = swdev_port_attr_get(dev, &attr);
+	if (err)
+		return err;
+
+	return ndo_dflt_bridge_getlink(skb, pid, seq, dev, mode,
+				       attr.brport_flags, mask);
+}
+EXPORT_SYMBOL_GPL(swdev_port_bridge_getlink);
+
 static int swdev_port_bridge_setflag(struct net_device *dev,
 				     struct nlattr *ifla,
 				     unsigned long brport_flag)
-- 
1.7.10.4