Problems with ConnectX2(rev:b0)

I have a Mellanox ConnextX2 ethernet adapter and I having some issues receiving packets on it. I am sending simple layer 2 vlan tagged packets. I can see the packets were sent on the wire to the ethernet card, but nothing gets received on the port. Where should I start debugging ? I looked at all the software tools, but no clue so far. Here are the details of my card

06:00.0 Ethernet controller: Mellanox Technologies MT26448 [ConnectX EN 10GigE, PCIe 2.0 5GT/s] (rev b0)

  Subsystem: Mellanox Technologies Device 0018

08:00.0 Ethernet controller: Mellanox Technologies MT26448 [ConnectX EN 10GigE, PCIe 2.0 5GT/s] (rev b0)

  Subsystem: Mellanox Technologies MT26448 [ConnectX EN 10GigE, PCIe 2.0 5GT/s]

21:00.0 Ethernet controller: Mellanox Technologies MT26448 [ConnectX EN 10GigE, PCIe 2.0 5GT/s] (rev b0)

  Subsystem: Mellanox Technologies MT26448 [ConnectX EN 10GigE, PCIe 2.0 5GT/s]

Any help would be appreciated

Thanks

Srini