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

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Message-ID: <564A2270.1040004@dev.mellanox.co.il>
Date:	Mon, 16 Nov 2015 20:37:36 +0200
From:	Sagi Grimberg <sagig@....mellanox.co.il>
To:	Steve Wise <swise@...ngridcomputing.com>,
	'Christoph Hellwig' <hch@....de>, linux-rdma@...r.kernel.org
Cc:	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


> After looking at the nes driver, I don't see any common way to support drain w/o some serious driver mods.  Since SRP is the only
> user, perhaps we can ignore iWARP for this function...

But iser/isert essentially does it too (and I think xprtrdma will have
it soon)...

the modify_qp is invoked from rdma_disconnect() and we do post
an 'empty' wr to wait for all the flushes to drain (see
iser_conn_terminate).
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