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

Christoph Hellwig
2015-11-14T07:05:34Z

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.