[Xen-users] bridge name not passed to network backend

[Henrik Riomar <henrik.riomar@xxxxxxxxx>]

Hi,

I have a problem getting backend driver domains to work with xl and
with multiple bridges
in the driver domain. (e.g. in a one brigde per domU setup).

example guest config:

vif         = [
'ip=192.168.1.31,mac=00:16:3E:ab:cd:ef,bridge=br_b,backend=net-back' ]

If the dom0 and the driver domain is running xm/xend with xen-4.1
(under Debian wheezy) it works fine,

From the syslog in the driver domain:

Mar 14 20:59:52 net-back logger: /etc/xen/scripts/vif-bridge: online
type_if=vif XENBUS_PATH=backend/vif/8/0
Mar 14 20:59:52 net-back kernel: [ 1252.739351] device vif8.0 entered
promiscuous mode
Mar 14 20:59:52 net-back kernel: [ 1252.744057] ADDRCONF(NETDEV_UP):
vif8.0: link is not ready
Mar 14 20:59:52 net-back kernel: [ 1252.873690] ip_tables: (C)
2000-2006 Netfilter Core Team
Mar 14 20:59:53 net-back logger: /etc/xen/scripts/vif-bridge:
Successful vif-bridge online for vif8.0, bridge br_b.
Mar 14 20:59:53 net-back logger: /etc/xen/scripts/vif-bridge: Writing
backend/vif/8/0/hotplug-status connected to xenstore.
Mar 14 20:59:55 net-back kernel: [ 1255.138904]
ADDRCONF(NETDEV_CHANGE): vif8.0:link becomes ready
Mar 14 21:00:05 net-back kernel: [ 1265.504218] vif8.0: no IPv6 routers present

root@net-back:~# brctl show
bridge name     bridge id               STP enabled     interfaces
br_a            8000.000000000000       no
br_b            8000.feffffffffff       no              vif8.0
br_c            8000.000000000000       no

But the same thing with xl under Debian Jessie and the bridge is not
passed at all to the backend, making it fallback to the first bridge.

Is this a known limitation with xl?

Thanks,
 Henrik

Debug in domU runnig under xl and xen-4.4 shows no brigde info being passed:

Environment passed to /etc/xen/scripts/vif-bridge:

SUBSYSTEM=xen-backend
DRIVER=vif
XENBUS_TYPE=vif
DEVPATH=/devices/vif-2-3
script=/etc/xen/scripts/vif-bridge
vif=vif2.3
ACTION=online
MODALIAS=xen-backend:vif
PWD=/
USEC_INITIALIZED=744061335
XENBUS_PATH=backend/vif/2/3
XENBUS_BASE_PATH=backend
SHLVL=1
UDEV_CALL=1
SEQNUM=793
_=/usr/bin/env

Parameters:
online type_if=vif

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