CP-1592: interface-reconfigure: Configure network device MTU from Net…

…work.MTU field

With override via other-config:mtu field on specific objects in the datamodel.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>

scripts/InterfaceReconfigure.py

@@ -295,6 +295,7 @@ def _otherconfig_from_xml(n, attrs):
 
 _NETWORK_ATTRS = { 'uuid': (_str_to_xml,_str_from_xml),
                    'bridge': (_str_to_xml,_str_from_xml),
+                   'MTU': (_str_to_xml,_str_from_xml),
                    'PIFs': (lambda x, p, t, v: _strlist_to_xml(x, p, 'PIFs', 'PIF', v),
                             lambda n: _strlist_from_xml(n, 'PIFs', 'PIF')),
                    'other_config': (lambda x, p, t, v: _otherconfig_to_xml(x, p, v, _NETWORK_OTHERCONFIG_ATTRS),
@@ -595,13 +596,33 @@ def ethtool_settings(oc):
                 log("Invalid value for ethtool-%s = %s. Must be on|true|off|false." % (opt, val))
     return settings,offload
 
-def mtu_setting(oc):
+# By default the MTU is taken from the Network.MTU setting for VIF,
+# PIF and Bridge. However it is possible to override this by using
+# {VIF,PIF,Network}.other-config:mtu.
+#
+# type parameter is a string describing the object that the oc parameter
+# is from. e.g. "PIF", "Network" 
+def mtu_setting(nw, type, oc):
+    mtu = None
+
+    nwrec = db().get_network_record(nw)
+    if nwrec.has_key('MTU'):
+        mtu = nwrec['MTU']
+    else:
+        mtu = "1500"
+
     if oc.has_key('mtu'):
+        log("Override Network.MTU setting on bridge %s from %s.MTU is %s" % \
+            (nwrec['bridge'], type, mtu))
+        mtu = oc['mtu']
+
+    if mtu is not None:
         try:
-            int(oc['mtu'])      # Check that the value is an integer
-            return oc['mtu']
+            int(mtu)      # Check that the value is an integer
+            return mtu
         except ValueError, x:
-            log("Invalid value for mtu = %s" % oc['mtu'])
+            log("Invalid value for mtu = %s" % mtu)
+
     return None
 
 #

scripts/InterfaceReconfigureBridge.py

@@ -295,6 +295,8 @@ def _configure_physical_interface(pif):
 
     pifrec = db().get_pif_record(pif)
 
+    log("Configuring physical interface %s" % pifrec['device'])
+
     f = open_pif_ifcfg(pif)
 
     f.write("TYPE=Ethernet\n")
@@ -306,7 +308,7 @@ def _configure_physical_interface(pif):
     if len(offload):
         f.write("ETHTOOL_OFFLOAD_OPTS=\"%s\"\n" % str.join(" ", offload))
 
-    mtu = mtu_setting(pifrec['other_config'])
+    mtu = mtu_setting(pifrec['network'], "PIF", pifrec['other_config'])
     if mtu:
         f.write("MTU=%s\n" % mtu)
 
@@ -364,7 +366,7 @@ def _configure_bond_interface(pif):
     if len(offload):
         f.write("ETHTOOL_OFFLOAD_OPTS=\"%s\"\n" % str.join(" ", offload))
 
-    mtu = mtu_setting(pifrec['other_config'])
+    mtu = mtu_setting(pifrec['network'], "Bond-PIF", pifrec['other_config'])
     if mtu:
         f.write("MTU=%s\n" % mtu)
 
@@ -414,7 +416,7 @@ def _configure_vlan_interface(pif):
     if len(offload):
         f.write("ETHTOOL_OFFLOAD_OPTS=\"%s\"\n" % str.join(" ", offload))
 
-    mtu = mtu_setting(pifrec['other_config'])
+    mtu = mtu_setting(pifrec['network'], "VLAN-PIF", pifrec['other_config'])
     if mtu:
         f.write("MTU=%s\n" % mtu)
 

scripts/InterfaceReconfigureVswitch.py

@@ -393,11 +393,12 @@ def configure(self):
         physical_devices = datapath_get_physical_pifs(self._dp)
 
         for p in physical_devices:
-            oc = db().get_pif_record(p)['other_config']
+            prec = db().get_pif_record(p)
+            oc = prec['other_config']
 
             dev = pif_netdev_name(p)
 
-            mtu = mtu_setting(oc)
+            mtu = mtu_setting(prec['network'], "PIF", oc)
 
             netdev_up(dev, mtu)
 

scripts/interface-reconfigure

@@ -284,7 +284,8 @@ def ipdev_configure_network(pif, dp):
     """
 
     pifrec = db().get_pif_record(pif)
-    nwrec = db().get_network_record(pifrec['network'])
+    nw = pifrec['network']
+    nwrec = db().get_network_record(nw)
 
     ipdev = pif_ipdev_name(pif)
 
@@ -319,12 +320,13 @@ def ipdev_configure_network(pif, dp):
         if len(offload):
             f.write("ETHTOOL_OFFLOAD_OPTS=\"%s\"\n" % str.join(" ", offload))
 
-        mtu = mtu_setting(nwrec['other_config'])
-        if mtu:
-            f.write("MTU=%s\n" % mtu)
-
         ipdev_configure_static_routes(ipdev, nwrec['other_config'], f)
 
+    mtu = mtu_setting(nw, "Network", nwrec['other_config'])
+    if mtu:
+        f.write("MTU=%s\n" % mtu)
+
+
     if pifrec.has_key('DNS') and pifrec['DNS'] != "":
         ServerList = pifrec['DNS'].split(",")
         for i in range(len(ServerList)): f.write("DNS%d=%s\n" % (i+1, ServerList[i]))

scripts/vif

@@ -62,7 +62,8 @@ handle_mtu()
 {
     local mtu=$(xenstore-read "${PRIVATE}/MTU" 2>/dev/null)
     if [ $? -eq 0 -a -n "${mtu}" ]; then
-	echo "${mtu}" > /sys/class/net/${dev}/mtu
+	logger -t scripts-vif "Setting ${dev} MTU ${mtu}"
+	${IP} link set "${dev}" mtu ${mtu} || logger -t scripts-vif "Failed to ip link set ${dev} mtu ${mtu}. Error code $?"
     fi
 }