Roland Dreier wrote:
OK, fair enough. I was really replying to the first sentence of:Caitlin> From the perspective of any given host, IP addresses are Caitlin> unique across all interface devices. A given connection Caitlin> can therefore be identified by just the 4-tuple, with no Caitlin> need to explicitly state "via this device". IP addresses are not unique. However, I do agree that a 4-tuple uniquely identifies a TCP connection.
I agree with this as well. But the CMA, when running over IB, does not establish TCP connections. It's simply mapping addresses. RDMA connections will end up being identified by QPs.
If a user tries to establish a connection, the CMA will determine which device that connection will go out on. If it's an IB device, there's no need for a local port number. If it's an iWarp device, then the iWarp CM will need to allocate a usable port number.
What I'm still trying to understand is why the CMA should allocate a port number for active connections. The port space over IB is separate, and the port number is not needed for connecting or routing data. Are there specific applications that will run over RDMA that will have a problem with this?
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