net: dsa: introduce bridge notifier

A slave device will now notify the switch fabric once its port is
bridged or unbridged, instead of calling directly its switch operations.

This code allows propagating cross-chip bridging events in the fabric.

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

1 files changed, 32 insertions, 0 deletions

diff --git a/net/dsa/switch.c b/net/dsa/switch.c
index e22fa7633d03..6456dacf9ae9 100644
--- a/net/dsa/switch.c
+++ b/net/dsa/switch.c
@@ -13,6 +13,32 @@
 #include <linux/notifier.h>
 #include <net/dsa.h>
 
+static int dsa_switch_bridge_join(struct dsa_switch *ds,
+                                  struct dsa_notifier_bridge_info *info)
+{
+        if (ds->index == info->sw_index && ds->ops->port_bridge_join)
+                return ds->ops->port_bridge_join(ds, info->port, info->br);
+
+        if (ds->index != info->sw_index)
+                dev_dbg(ds->dev, "crosschip DSA port %d.%d bridged to %s\n",
+                        info->sw_index, info->port, netdev_name(info->br));
+
+        return 0;
+}
+
+static int dsa_switch_bridge_leave(struct dsa_switch *ds,
+                                   struct dsa_notifier_bridge_info *info)
+{
+        if (ds->index == info->sw_index && ds->ops->port_bridge_leave)
+                ds->ops->port_bridge_leave(ds, info->port, info->br);
+
+        if (ds->index != info->sw_index)
+                dev_dbg(ds->dev, "crosschip DSA port %d.%d unbridged from %s\n",
+                        info->sw_index, info->port, netdev_name(info->br));
+
+        return 0;
+}
+
 static int dsa_switch_event(struct notifier_block *nb,
                             unsigned long event, void *info)
 {
@@ -20,6 +46,12 @@ static int dsa_switch_event(struct notifier_block *nb,
         int err;
 
         switch (event) {
+        case DSA_NOTIFIER_BRIDGE_JOIN:
+                err = dsa_switch_bridge_join(ds, info);
+                break;
+        case DSA_NOTIFIER_BRIDGE_LEAVE:
+                err = dsa_switch_bridge_leave(ds, info);
+                break;
         default:
                 err = -EOPNOTSUPP;
                 break;