Re: Work completions generated after a queue pair has made the transition to an error state

[Ralph Campbell <ralph.campbell-h88ZbnxC6KDQT0dZR+AlfA@public.gmane.org>]

I haven't seen it. It isn't supposed to happen.

What hardware and software are you using and how do you
reproduce it?


On Tue, 2010-10-12 at 11:38 -0700, Bart Van Assche wrote:
> Hello,
> 
> Has anyone already tried to process the work completions generated by
> a HCA after the state of a queue pair has been changed to IB_QPS_ERR ?
> With the hardware/firmware/driver combination I have tested I have
> observed the following:
> * Multiple completions with the same wr_id and nonzero (error) status
> were received by the application, while all work requests queued with
> the flag IB_SEND_SIGNALED had a unique wr_id.
> * Completions with non-zero (error) status and a wr_id / opcode
> combination were received that were never queued by the application.
> Note: some work requests were queued with and some without the flag
> IB_SEND_SIGNALED. I'm not sure however whether that has anything to do
> with the observed behavior.
> 
> This behavior is easy to reproduce. If I interpret the InfiniBand
> Architecture Specification correctly, this behavior is non-compliant.
> 
> Has anyone been looking into this before ?
> 
> Bart.
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