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

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Message-ID: <20151114070531.GC27738@lst.de>
Date:	Sat, 14 Nov 2015 08:05:31 +0100
From:	Christoph Hellwig <hch@....de>
To:	Steve Wise <swise@...ngridcomputing.com>
Cc:	Christoph Hellwig <hch@....de>, linux-rdma@...r.kernel.org,
	sagig@....mellanox.co.il, bart.vanassche@...disk.com, axboe@...com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/9] IB: add a helper to safely drain a QP

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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