Re: [Xen-users] xen bridge jumbo frame problems starting new DomU

[Fischer Udo Attila <udo@xxxxxx>]

Hi Peter,

I have already programmed it only a little different:
and it works if you want to set it below 1500, but fails if you want to 
go over 1500..
the domain start fails if it is set over 1500 (RTNETLINK answers: 
Invalid argument)

Best Regards,
Udo Attila Fischer



PS: Maybe it the following code should not posted here but  maybe it is 
usefull  if somebody want to change settings below 1500.
in the /etc/xen/scripts
--- vif-common.sh.orig  2009-10-24 01:15:59.000000000 +0200
+++ vif-common.sh       2009-10-26 16:15:54.000000000 +0100
@@ -63,6 +63,11 @@
  vif="$vifname"
fi

+mtu=$(xenstore_read_default "$XENBUS_PATH/mtu" "")
+if [ "$mtu" ] && [ "$command" == "online" ]
+then
+ ip link set $vif mtu "$mtu"
+fi

frob_iptable()
{


in the xen phyton scripts directory:
--- xm/create.py.orig   2009-10-24 02:19:04.000000000 +0200
+++ xm/create.py        2009-10-24 02:22:07.000000000 +0200
@@ -354,7 +354,7 @@
          keymap overrides the XendD configured default layout file.""")

gopts.var('vif', 
val="type=TYPE,mac=MAC,bridge=BRIDGE,ip=IPADDR,script=SCRIPT," + \
-          "backend=DOM,vifname=NAME,rate=RATE,model=MODEL,accel=ACCEL",
+          
"backend=DOM,vifname=NAME,rate=RATE,model=MODEL,accel=ACCEL,mtu=MTU",
          fn=append_value, default=[],
          use="""Add a network interface with the given MAC address and 
bridge.
          The vif is configured by calling the given configuration script.
@@ -850,7 +850,7 @@
        def f(k):
            if k not in ['backend', 'bridge', 'ip', 'mac', 'script', 
'type',
                         'vifname', 'rate', 'model', 'accel',
-                         'policy', 'label']:
+                         'policy', 'label', 'mtu']:
                err('Invalid vif option: ' + k)

            config_vif.append([k, d[k]])


--- xend/server/netif.py.orig   2009-01-05 21:27:55.000000000 +0100
+++ xend/server/netif.py        2009-10-24 03:46:17.000000000 +0200
@@ -115,6 +115,7 @@
        model   = config.get('model')
        accel   = config.get('accel')
        sec_lab = config.get('security_label')
+        mtu = config.get('mtu')

        if not mac:
            raise VmError("MAC address not specified or generated.")
@@ -141,6 +142,8 @@
            back['accel'] = accel
        if sec_lab:
            back['security_label'] = sec_lab
+        if mtu:
+            back['mtu'] = mtu

        back['handle'] = "%i" % devid
        back['script'] = os.path.join(xoptions.network_script_dir, script)
@@ -187,7 +190,7 @@

        for x in ( 'script', 'ip', 'bridge', 'mac',
                   'type', 'vifname', 'rate', 'uuid', 'model', 'accel',
-                   'security_label'):
+                   'security_label', 'mtu'):
            if transaction is None:
                y = self.readBackend(devid, x)
            else:
--- xm/main.py.orig     2009-10-24 02:55:52.000000000 +0200
+++ xm/main.py  2009-10-24 03:02:08.000000000 +0200
@@ -188,7 +188,7 @@
    'network-attach':  ('<Domain> [type=<type>] [mac=<mac>] 
[bridge=<bridge>] '
                        '[ip=<ip>] [script=<script>] 
[backend=<BackDomain>] '
                        '[vifname=<name>] [rate=<rate>] [model=<model>]'
-                        '[accel=<accel>]',
+                        '[accel=<accel>]' '[mtu=<mtu>]',
                        'Create a new virtual network device.'),
    'network-detach':  ('<Domain> <DevId> [-f|--force]',
                        'Destroy a domain\'s virtual network device.'),
@@ -2416,7 +2416,7 @@
    dom = args[0]
    vif = ['vif']
    vif_params = ['type', 'mac', 'bridge', 'ip', 'script', \
-                  'backend', 'vifname', 'rate', 'model', 'accel']
+                  'backend', 'vifname', 'rate', 'model', 'accel', 'mtu']

    if serverType == SERVER_XEN_API:
        vif_record = {
@@ -2465,7 +2465,9 @@
            'model':
                lambda x: None,
            'accel':
-                lambda x: set(['other_config', 'accel'], x)
+                lambda x: set(['other_config', 'accel'], x),
+            'mtu':
+                lambda x: set(['other_config', 'mtu'], x)
            }

        for a in args[1:]:

--- xend/XendDomainInfo.py.orig 2009-10-24 05:05:37.000000000 +0200
+++ xend/XendDomainInfo.py      2009-10-24 05:25:20.000000000 +0200
@@ -3213,7 +3213,8 @@
                    # some point we're going to have to figure out how to
                    # handle that properly.

-            config['MTU'] = 1500 # TODO
+            #config['MTU'] = 1500 # TODO
+            config['MTU'] =   config.get('mtu', 1500) # TODO

            if self._stateGet() not in (XEN_API_VM_POWER_STATE_HALTED,):
                xennode = XendNode.instance()

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