net: dsa: add FDB notifier

Add two new DSA_NOTIFIER_FDB_ADD and DSA_NOTIFIER_FDB_DEL events to
notify not only a single switch, but all switches of a the fabric when
an FDB entry is added or removed.

For the moment, keep the current behavior and ignore other switches.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 43 insertions, 0 deletions

diff --git a/net/dsa/switch.c b/net/dsa/switch.c
index 540770ecc8b0..e71cc860d32c 100644
--- a/net/dsa/switch.c
+++ b/net/dsa/switch.c
@@ -84,6 +84,43 @@ static int dsa_switch_bridge_leave(struct dsa_switch *ds,
         return 0;
 }
 
+static int dsa_switch_fdb_add(struct dsa_switch *ds,
+                              struct dsa_notifier_fdb_info *info)
+{
+        const struct switchdev_obj_port_fdb *fdb = info->fdb;
+        struct switchdev_trans *trans = info->trans;
+
+        /* Do not care yet about other switch chips of the fabric */
+        if (ds->index != info->sw_index)
+                return 0;
+
+        if (switchdev_trans_ph_prepare(trans)) {
+                if (!ds->ops->port_fdb_prepare || !ds->ops->port_fdb_add)
+                        return -EOPNOTSUPP;
+
+                return ds->ops->port_fdb_prepare(ds, info->port, fdb, trans);
+        }
+
+        ds->ops->port_fdb_add(ds, info->port, fdb, trans);
+
+        return 0;
+}
+
+static int dsa_switch_fdb_del(struct dsa_switch *ds,
+                              struct dsa_notifier_fdb_info *info)
+{
+        const struct switchdev_obj_port_fdb *fdb = info->fdb;
+
+        /* Do not care yet about other switch chips of the fabric */
+        if (ds->index != info->sw_index)
+                return 0;
+
+        if (!ds->ops->port_fdb_del)
+                return -EOPNOTSUPP;
+
+        return ds->ops->port_fdb_del(ds, info->port, fdb);
+}
+
 static int dsa_switch_event(struct notifier_block *nb,
                             unsigned long event, void *info)
 {
@@ -100,6 +137,12 @@ static int dsa_switch_event(struct notifier_block *nb,
         case DSA_NOTIFIER_BRIDGE_LEAVE:
                 err = dsa_switch_bridge_leave(ds, info);
                 break;
+        case DSA_NOTIFIER_FDB_ADD:
+                err = dsa_switch_fdb_add(ds, info);
+                break;
+        case DSA_NOTIFIER_FDB_DEL:
+                err = dsa_switch_fdb_del(ds, info);
+                break;
         default:
                 err = -EOPNOTSUPP;
                 break;