Re: [PATCH 3/9] IB: add a helper to safely drain a QP

[Christoph Hellwig]

On Fri, Nov 13, 2015 at 10:16:04AM -0600, Steve Wise wrote:
> So how can we do this for iwarp?  It seems like all that might be needed is 
> to modify the QP state to idle, retrying until it succeeds:
>
>    If the QP is transitioning to the Error state, or has not yet
>    finished flushing the Work Queues, a Modify QP request to transition
>    to the IDLE state MUST fail with an Immediate Error. If none of the
>    prior conditions are true, a Modify QP to the Idle state MUST take
>    the QP to the Idle state. No other state transitions out of Error
>    are supported. Any attempt to transition the QP to a state other
>    than Idle MUST result in an Immediate Error.

Can you try to write up some code for this?  We could then wire it up
in the common helper.
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