net: dsa: add switch notifier

Add a notifier block per DSA switch, registered against a notifier head
in the switch fabric they belong to.

This infrastructure will allow to propagate fabric-wide events such as
port bridging, VLAN configuration, etc. If a DSA switch driver cares
about cross-chip configuration, such events can be caught.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index beb79ccf0f59..22e44f691ab9 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -275,6 +275,10 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
         if (ret < 0)
                 return ret;
 
+        ret = dsa_switch_register_notifier(ds);
+        if (ret)
+                return ret;
+
         if (ops->set_addr) {
                 ret = ops->set_addr(ds, dst->master_netdev->dev_addr);
                 if (ret < 0)
@@ -400,6 +404,8 @@ static void dsa_switch_destroy(struct dsa_switch *ds)
 
         if (ds->slave_mii_bus && ds->ops->phy_read)
                 mdiobus_unregister(ds->slave_mii_bus);
+
+        dsa_switch_unregister_notifier(ds);
 }
 
 #ifdef CONFIG_PM_SLEEP