vswitch: Remove PMTUD support from userspace.

This patch removes path MTU discovery from userspace.  The feature
still exists in the kernel where it will need to be removed in the
future.

Signed-off-by: Ethan Jackson <ethan@nicira.com>

NEWS

@@ -7,6 +7,7 @@ post-v1.9.0
       available through ovs-appctl allow control over logging rate limits.
     - The OpenFlow "dp_desc" may now be configured by setting the value of 
       other-config:dp-desc in the Bridge table.
+    - Path MTU discovery is no longer supported.
 
 
 v1.9.0 - xx xxx xxxx

lib/netdev-vport.c

@@ -590,14 +590,6 @@ parse_tunnel_config(const char *name, const char *type,
             if (!strcmp(node->value, "false")) {
                 flags &= ~TNL_F_DF_DEFAULT;
             }
-        } else if (!strcmp(node->key, "pmtud")) {
-            if (!strcmp(node->value, "true")) {
-                VLOG_WARN_ONCE("%s: The tunnel Path MTU discovery is "
-                               "deprecated and may be removed in February "
-                               "2013. Please email dev@openvswitch.org with "
-                               "concerns.", name);
-                flags |= TNL_F_PMTUD;
-            }
         } else if (!strcmp(node->key, "peer_cert") && is_ipsec) {
             if (smap_get(args, "certificate")) {
                 ipsec_mech_set = true;
@@ -798,9 +790,6 @@ unparse_tunnel_config(const char *name OVS_UNUSED, const char *type OVS_UNUSED,
     if (!(flags & TNL_F_DF_DEFAULT)) {
         smap_add(args, "df_default", "false");
     }
-    if (flags & TNL_F_PMTUD) {
-        smap_add(args, "pmtud", "true");
-    }
 
     return 0;
 }

vswitchd/vswitch.xml

@@ -1415,18 +1415,6 @@
         <code>false</code> to disable.
       </column>
 
-      <column name="options" key="pmtud" type='{"type": "boolean"}'>
-        Optional.  Enable tunnel path MTU discovery.  If enabled ``ICMP
-        Destination Unreachable - Fragmentation Needed'' messages will be
-        generated for IPv4 packets with the DF bit set and IPv6 packets above
-        the minimum MTU if the packet size exceeds the path MTU minus the size
-        of the tunnel headers.  Note that this option causes behavior that is
-        typically reserved for routers and therefore is not entirely in
-        compliance with the IEEE 802.1D specification for bridges.  Default is
-        disabled; set to <code>true</code> to enable.  This feature is
-        deprecated and will be removed soon.
-      </column>
-
       <group title="Tunnel Options: gre and ipsec_gre only">
         <p>
           Only <code>gre</code> and <code>ipsec_gre</code> interfaces support