On 1/4/2012 11:23 PM, Greg I Kerr wrote:
Yes I want to do this with IB. I wasn't aware that I could use a UD QP to write my own packets to the wire. Is this what you're suggesting I can use a UD QP for?
You'll have to further clarify the "my own packets" part of your sentence... IB have some layers which come into play in various elements (software/hardware of HCAs/switches) during the life cycle of the packet. Specifically each IB packet would have an IB L2 header called LRH, IB also has L3 header named GRH which is optional unless you need multicast (or IBoE). The UD thing I mentioned is IB's L4 - the transport. The most common transports are UD and RC. So if you go UD the packet will have L2 (LRH) and L4 UD headers (called BTH plus DTH) which on top of you add the payload.
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