From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Subject: Re: [PATCH rdma-next 0/3] Support out of order data placement
Date: Mon, 12 Jun 2017 15:22:07 -0600
Message-ID: <20170612212207.GB27649@obsidianresearch.com>
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To: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
Cc: "'Hefty, Sean'" <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, "'Dalessandro, Dennis'" <dennis.dalessandro-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, 'Parav Pandit' <parav-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>, 'Leon Romanovsky' <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, 'Doug Ledford' <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, 'Idan Burstein' <idanb-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
List-Id: linux-rdma@vger.kernel.org

On Mon, Jun 12, 2017 at 04:18:34PM -0500, Steve Wise wrote:

> buffer when it polls the recv completion for the SEND or WRITE_W_IMMD.  An iWARP
> RNIC _must_ guarantee in-order delivery of data (but not actual placement).  Am
> I making sense?

Yes, and IB is technically the same.

As Tom pointed out, it is a quirk of the x86 & mellanox combination
that apps can reliably 'spin on the last byte', it is certainly not
guaranteed by any spec.

Jason
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