[PATCH v2 rfc 3/8] net: bridge: Add/del switchdev object on host join/leave

[Andrew Lunn]

When the host joins or leaves a multicast group, use switchdev to add
an object to the hardware to forward traffic for the group to the
host.

Signed-off-by: Andrew Lunn <and...@lunn.ch>
---
 include/net/switchdev.h   |  1 +
 net/bridge/br_mdb.c       | 39 +++++++++++++++++++++++++++++++++++++++
 net/switchdev/switchdev.c |  2 ++
 3 files changed, 42 insertions(+)

diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index d767b7991887..b298a6b4c11d 100644
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -75,6 +75,7 @@ enum switchdev_obj_id {
        SWITCHDEV_OBJ_ID_UNDEFINED,
        SWITCHDEV_OBJ_ID_PORT_VLAN,
        SWITCHDEV_OBJ_ID_PORT_MDB,
+       SWITCHDEV_OBJ_ID_HOST_MDB,
 };
 
 struct switchdev_obj {
diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index 80fa91ccc50c..a9c03f3a3b88 100644
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -291,6 +291,42 @@ static void br_mdb_complete(struct net_device *dev, int 
err, void *priv)
        kfree(priv);
 }
 
+static void br_mdb_switchdev_host_port(struct net_device *dev,
+                                      struct net_device *lower_dev,
+                                      struct br_mdb_entry *entry, int type)
+{
+       struct switchdev_obj_port_mdb mdb = {
+               .obj = {
+                       .id = SWITCHDEV_OBJ_ID_HOST_MDB,
+                       .flags = SWITCHDEV_F_DEFER,
+               },
+               .vid = entry->vid,
+       };
+
+       if (entry->addr.proto == htons(ETH_P_IP))
+               ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
+#if IS_ENABLED(CONFIG_IPV6)
+       else
+               ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
+#endif
+
+       mdb.obj.orig_dev = dev;
+       if (type == RTM_NEWMDB)
+               switchdev_port_obj_add(lower_dev, &mdb.obj);
+       if (type == RTM_DELMDB)
+               switchdev_port_obj_del(lower_dev, &mdb.obj);
+}
+
+static void br_mdb_switchdev_host(struct net_device *dev,
+                                 struct br_mdb_entry *entry, int type)
+{
+       struct net_device *lower_dev;
+       struct list_head *iter;
+
+       netdev_for_each_lower_dev(dev, lower_dev, iter)
+               br_mdb_switchdev_host_port(dev, lower_dev, entry, type);
+}
+
 static void __br_mdb_notify(struct net_device *dev, struct net_bridge_port *p,
                            struct br_mdb_entry *entry, int type)
 {
@@ -330,6 +366,9 @@ static void __br_mdb_notify(struct net_device *dev, struct 
net_bridge_port *p,
                switchdev_port_obj_del(port_dev, &mdb.obj);
        }
 
+       if (!p)
+               br_mdb_switchdev_host(dev, entry, type);
+
        skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
        if (!skb)
                goto errout;
diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
index 0531b41d1f2d..74b9d916a58b 100644
--- a/net/switchdev/switchdev.c
+++ b/net/switchdev/switchdev.c
@@ -345,6 +345,8 @@ static size_t switchdev_obj_size(const struct switchdev_obj 
*obj)
                return sizeof(struct switchdev_obj_port_vlan);
        case SWITCHDEV_OBJ_ID_PORT_MDB:
                return sizeof(struct switchdev_obj_port_mdb);
+       case SWITCHDEV_OBJ_ID_HOST_MDB:
+               return sizeof(struct switchdev_obj_port_mdb);
        default:
                BUG();
        }
-- 
2.14.1