Tom Tucker wrote:
I'm not sure of all the issues you're considering, but it seems to me at
first blush that the user space stuff should talk the kernel CMA. If you
don't do it in the kernel:
- you will end up replicating transport dependent connection management
logic in the user mode library
- you will have to export, support and maintain a much larger number of
kernel services
- implementing security/provisioning policy in user mode is trickier
than in the kernel
My hope is that the userspace CMA can talk to the kernel CMA. Otherwise, I need
to expose the kernel address translation and SA query services, plus deal with
more complicated event handling.
The issue is that the kernel CMA performs QP transitions, which would need to
change for userspace QPs. To transition the QPs properly, the userspace CMA
would need to do so based on IB CM messages, and not kernel CMA events.
- Sean
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