switchdev: add new switchdev_port_bridge_getlink

Like bridge_setlink, add switchdev 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 switchdev code.

Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 28 insertions, 0 deletions

diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
index 0e15b6f6bb56..9210355ec965 100644
--- a/net/switchdev/switchdev.c
+++ b/net/switchdev/switchdev.c
@@ -358,6 +358,34 @@ int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
 }
 EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
 
+/**
+ *      switchdev_port_bridge_getlink - Get bridge port attributes
+ *
+ *      @dev: port device
+ *
+ *      Called for SELF on rtnl_bridge_getlink to get bridge port
+ *      attributes.
+ */
+int switchdev_port_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
+                                  struct net_device *dev, u32 filter_mask,
+                                  int nlflags)
+{
+        struct switchdev_attr attr = {
+                .id = SWITCHDEV_ATTR_PORT_BRIDGE_FLAGS,
+        };
+        u16 mode = BRIDGE_MODE_UNDEF;
+        u32 mask = BR_LEARNING | BR_LEARNING_SYNC;
+        int err;
+
+        err = switchdev_port_attr_get(dev, &attr);
+        if (err)
+                return err;
+
+        return ndo_dflt_bridge_getlink(skb, pid, seq, dev, mode,
+                                       attr.brport_flags, mask, nlflags);
+}
+EXPORT_SYMBOL_GPL(switchdev_port_bridge_getlink);
+
 static int switchdev_port_br_setflag(struct net_device *dev,
                                      struct nlattr *nlattr,
                                      unsigned long brport_flag)