[PATCH net-next 6/9] net: dsa: mv88e6xxx: assign dynamic FDB to bridges

[Vivien Didelot]

Give a new bridge a fresh FDB, assign it to its members, and restore a
fresh FDB to a port leaving a bridge.

Signed-off-by: Vivien Didelot <vivien.dide...@savoirfairelinux.com>
---
 drivers/net/dsa/mv88e6xxx.c | 41 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx.c b/drivers/net/dsa/mv88e6xxx.c
index 0f06488..0f16911 100644
--- a/drivers/net/dsa/mv88e6xxx.c
+++ b/drivers/net/dsa/mv88e6xxx.c
@@ -2093,19 +2093,56 @@ int mv88e6xxx_port_bridge_join(struct dsa_switch *ds, 
int port,
                               struct net_device *bridge)
 {
        struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
+       u16 fid;
+       int i, err;
+
+       mutex_lock(&ps->smi_mutex);
+
+       /* Get or create the bridge FID and assign it to the port */
+       for (i = 0; i < ps->num_ports; ++i)
+               if (ps->ports[i].bridge_dev == bridge)
+                       break;
+
+       if (i < ps->num_ports)
+               err = _mv88e6xxx_port_fid_get(ds, i, &fid);
+       else
+               err = _mv88e6xxx_fid_new(ds, &fid);
+       if (err)
+               goto unlock;
+
+       err = _mv88e6xxx_port_fid_set(ds, port, fid);
+       if (err)
+               goto unlock;
 
        ps->ports[port].bridge_dev = bridge;
+unlock:
+       mutex_unlock(&ps->smi_mutex);
 
-       return 0;
+       return err;
 }
 
 int mv88e6xxx_port_bridge_leave(struct dsa_switch *ds, int port)
 {
        struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
+       u16 fid;
+       int err;
+
+       mutex_lock(&ps->smi_mutex);
+
+       /* Give the port a fresh Filtering Information Database */
+       err = _mv88e6xxx_fid_new(ds, &fid);
+       if (err)
+               goto unlock;
+
+       err = _mv88e6xxx_port_fid_set(ds, port, fid);
+       if (err)
+               goto unlock;
 
        ps->ports[port].bridge_dev = NULL;
+unlock:
+       mutex_unlock(&ps->smi_mutex);
 
-       return 0;
+       return err;
 }
 
 static int mv88e6xxx_setup_port_default_vlan(struct dsa_switch *ds, int port)
-- 
2.7.1