mckey program does not work

I used mckey to test RDMA CM multicast setup but it fails. Any help is appreciated.

First of all, I started a machine to run as the receiver by "mckey -m 10.22.1.1". Then in another machine, I started mckey as the send by "mckey -m 10.22.1.1 -s".

And the output of the sender is shown as below:

mckey: starting client
mckey: joining
mckey: joined dgid: ff0e::ffff:a16:101 mlid 0x0 sl 0
initiating data transfers
mlx4: local QP operation err (QPN 041707, WQE index 0, vendor syndrome 75, opcode = 5e)
data transfers complete
test complete
return status 0

And the receiver is still waiting:

mckey: starting server
mckey: joining
mckey: joined dgid: ff0e::ffff:a16:101 mlid 0x0 sl 0
receiving data transfers

My device is configured below:

CA 'mlx4_0'    CA type: MT4103    Number of ports: 2    Firmware version: 2.34.5060    Hardware version: 0    Node GUID: 0x7cfe900300a3fc60    System image GUID: 0x7cfe900300a3fc60    Port 1:        State: Active        Physical state: LinkUp        Rate: 40        Base lid: 0        LMC: 0        SM lid: 0        Capability mask: 0x0c010000        Port GUID: 0x7efe90fffea3fc60        Link layer: Ethernet    Port 2:        State: Active        Physical state: LinkUp        Rate: 40        Base lid: 0        LMC: 0        SM lid: 0        Capability mask: 0x0c010000        Port GUID: 0x7efe90fffea3fc61        Link layer: Ethernet