[ofa-general] QDR IB cards supports card back to back connectivity

[Roland Dreier]

 >  I would like know the QDR Infinibad cards will support to back to
 >  back connectivity or not ie with out IB swicth to enable the IB
 >  communication between the two machines .

Yes, any IB port should be able to connect to any other IB port.  You do
need a subnet manager (SM) on every IB fabric, so in your case of two
HCAs connected back-to-back, and SM must be running on one of the HCA ports.