datapath: Set datapath device MTU to minimum of MTU of ports.

[sliver-openvswitch.git] / datapath / datapath.c

diff --git a/datapath/datapath.c b/datapath/datapath.c
index 539859a..116fd98 100644 (file)
--- a/datapath/datapath.c
+++ b/datapath/datapath.c
@@ -419,6 +419,7 @@ got_port_no:
        if (err)
                goto out_put;
 
+       set_dp_devs_mtu(dp, dev);
        dp_sysfs_add_if(dp->ports[port_no]);
 
        err = __put_user(port_no, &port.port);
@@ -1319,6 +1320,29 @@ int dp_min_mtu(const struct datapath *dp)
        return mtu ? mtu : ETH_DATA_LEN;
 }
 
+/* Sets the MTU of all datapath devices to the minimum of the ports. 'dev'
+ * is the device whose MTU may have changed.  Must be called with RTNL lock
+ * and dp_mutex. */
+void set_dp_devs_mtu(const struct datapath *dp, struct net_device *dev)
+{
+       struct net_bridge_port *p;
+       int mtu;
+
+       ASSERT_RTNL();
+
+       if (is_dp_dev(dev))
+               return;
+
+       mtu = dp_min_mtu(dp);
+
+       list_for_each_entry_rcu (p, &dp->port_list, node) {
+               struct net_device *br_dev = p->dev;
+
+               if (is_dp_dev(br_dev))
+                       dev_set_mtu(br_dev, mtu);
+       }
+}
+
 static int
 put_port(const struct net_bridge_port *p, struct odp_port __user *uop)
 {