How to get virtualized SR-IOV Infiniband interface UP?

How to get virtualized SR-IOV Infiniband interface UP?

I've spent several days on this now and I've managed to get SR-IOV working
with the Mellanox Infiniband card using the latest firmware.
The Virtual Functions appear in Dom0 as
06:00.1 Network controller: Mellanox Technologies MT27500 Family
[ConnectX-3 Virtual Function] 06:00.2 Network controller: Mellanox
Technologies MT27500 Family [ConnectX-3 Virtual Function] 06:00.3 Network
controller: Mellanox Technologies MT27500 Family [ConnectX-3 Virtual
Function] 06:00.4 Network controller: Mellanox Technologies MT27500 Family
[ConnectX-3 Virtual Function]
I've then detached 06:00.1 from Dom0 and assigned it to xen-pciback.
I've passed this into a Xen test domain.
lspci inside the test DomU shows:
00:01.1 Network controller: Mellanox Technologies MT27500 Family
[ConnectX-3 Virtual Function]
I have the following modules loaded in DomU
mlx4_ib
rdma_ucm
ib_umad
ib_uverbs
ib_ipoib
dmesg output for mlx4 drivers shows:
[ 11.956787] mlx4_core: Mellanox ConnectX core driver v1.1 (Dec, 2011)
[ 11.956789] mlx4_core: Initializing 0000:00:01.1
[ 11.956859] mlx4_core 0000:00:01.1: enabling device (0000 -> 0002)
[ 11.957242] mlx4_core 0000:00:01.1: Xen PCI mapped GSI0 to IRQ30
[ 11.957581] mlx4_core 0000:00:01.1: Detected virtual function - running
in slave mode
[ 11.957606] mlx4_core 0000:00:01.1: Sending reset
[ 11.957699] mlx4_core 0000:00:01.1: Sending vhcr0
[ 11.976090] mlx4_core 0000:00:01.1: HCA minimum page size:512
[ 11.976672] mlx4_core 0000:00:01.1: Timestamping is not supported in
slave mode.
[ 12.068079] <mlx4_ib> mlx4_ib_add: mlx4_ib: Mellanox ConnectX
InfiniBand driver v1.0 (April 4, 2008)
[ 12.184072] mlx4_core 0000:00:01.1: mlx4_ib: multi-function enabled
[ 12.184075] mlx4_core 0000:00:01.1: mlx4_ib: operating in qp1 tunnel mode
I've even got the ib0 device appearing.
ib0 Link encap:UNSPEC HWaddr
80-00-05-49-FE-80-00-00-00-00-00-00-00-00-00-00
inet addr:10.10.10.10 Bcast:10.10.10.255 Mask:255.255.255.0
UP BROADCAST MULTICAST MTU:2044 Metric:1
RX packets:117303 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:256
RX bytes:6576132 (6.5 MB) TX bytes:0 (0.0 B)
I can even locally ping 10.10.10.10.
However, those pings aren't sent out on the infiniband fabric.
It appears to be because the link is down. ibstat shows:
CA 'mlx4_0'
CA type: MT4100
Number of ports: 1
Firmware version: 2.30.3000
Hardware version: 0
Node GUID: 0x001405005ef41f25
System image GUID: 0x002590ffff175727
Port 1:
State: Down
Physical state: LinkUp
Rate: 10
Base lid: 9
LMC: 0
SM lid: 1
Capability mask: 0x02514868
Port GUID: 0x0000000000000000
How do I get it UP? the domU link is UP but not the VF one?