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/dsa2.c b/net/dsa/dsa2.c
index 9f8cc26be9ea..1c546b6621ee 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -294,6 +294,10 @@ static int dsa_ds_apply(struct dsa_switch_tree *dst, struct dsa_switch *ds)
         if (err < 0)
                 return err;
 
+        err = dsa_switch_register_notifier(ds);
+        if (err)
+                return err;
+
         if (ds->ops->set_addr) {
                 err = ds->ops->set_addr(ds, dst->master_netdev->dev_addr);
                 if (err < 0)
@@ -364,6 +368,8 @@ static void dsa_ds_unapply(struct dsa_switch_tree *dst, struct dsa_switch *ds)
 
         if (ds->slave_mii_bus && ds->ops->phy_read)
                 mdiobus_unregister(ds->slave_mii_bus);
+
+        dsa_switch_unregister_notifier(ds);
 }
 
 static int dsa_dst_apply(struct dsa_switch_tree *dst)