X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;ds=sidebyside;f=datapath%2Fdatapath.c;h=116fd989cd51688a83225e9203fef47c3eee71ce;hb=23935e8bcb5be3e82ed2fb16333fdbea36eedfcd;hp=539859a40c908a2698d12fa9970e70f484809ac6;hpb=8cdaca99b5742489c35b1cac6e39791a47451952;p=openvswitch

diff --git a/datapath/datapath.c b/datapath/datapath.c
index 539859a4..116fd989 100644
--- 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)
 {