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From: Sagi Grimberg <sagig-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
To: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Cc: dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Liran Liss <liranl-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Subject: Re: [PATCH 10/11] IB: only keep a single key in struct ib_mr
Date: Tue, 22 Dec 2015 18:58:14 +0200	[thread overview]
Message-ID: <56798126.9000003@dev.mellanox.co.il> (raw)
In-Reply-To: <20151222135927.GA26311-jcswGhMUV9g@public.gmane.org>


> The ULP decides if this MR is going to be used as a lkey or rkey
> by passing IB_REG_LKEY or IB_REG_RKEY.  The HCA driver will then
> fill mr->key by the lkey or rkey based on that and everything will
> work fine.

But the ULP *can* register a memory buffer with local and remote
access permissions. One example is ImmediateData or a FirstBurst
implementation where an initiator sends the first burst of data and
the target reads the rest of it. My concern is that a device that
uses different keys would not be able to support that (or we make
the ULP perform two registrations).
--
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  parent reply	other threads:[~2015-12-22 16:58 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-22 17:46 memory registration updates Christoph Hellwig
     [not found] ` <1448214409-7729-1-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2015-11-22 17:46   ` [PATCH 01/11] IB: start documenting device capabilities Christoph Hellwig
2015-11-22 17:46   ` [PATCH 02/11] IB: remove ib_query_mr Christoph Hellwig
2015-11-22 17:46   ` [PATCH 03/11] IB: remove support for phys MRs Christoph Hellwig
     [not found]     ` <1448214409-7729-4-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2015-11-24 12:01       ` Devesh Sharma
2015-11-22 17:46   ` [PATCH 04/11] IB: remove in-kernel support for memory windows Christoph Hellwig
2015-11-22 17:46   ` [PATCH 05/11] cxgb3: simplify iwch_get_dma_wr Christoph Hellwig
2015-11-22 17:46   ` [PATCH 06/11] nes: simplify nes_reg_phys_mr calling conventions Christoph Hellwig
2015-11-22 17:46   ` [PATCH 07/11] amso1100: fold c2_reg_phys_mr into c2_get_dma_mr Christoph Hellwig
2015-11-22 17:46   ` [PATCH 08/11] ehca: stop using struct ib_phys_buf Christoph Hellwig
2015-11-22 17:46   ` [PATCH 09/11] IB: remove the struct ib_phys_buf definition Christoph Hellwig
2015-11-22 17:46   ` [PATCH 10/11] IB: only keep a single key in struct ib_mr Christoph Hellwig
     [not found]     ` <1448214409-7729-11-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2015-11-23 19:41       ` Jason Gunthorpe
     [not found]         ` <20151123194124.GF32085-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-11-23 19:48           ` Christoph Hellwig
2015-12-22  9:17       ` Sagi Grimberg
     [not found]         ` <56791542.6020604-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-12-22 13:13           ` Christoph Hellwig
     [not found]             ` <20151222131326.GA25267-jcswGhMUV9g@public.gmane.org>
2015-12-22 13:50               ` Sagi Grimberg
     [not found]                 ` <56795514.9090704-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-12-22 13:59                   ` Christoph Hellwig
     [not found]                     ` <20151222135927.GA26311-jcswGhMUV9g@public.gmane.org>
2015-12-22 16:58                       ` Sagi Grimberg [this message]
     [not found]                         ` <56798126.9000003-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-12-22 21:09                           ` Jason Gunthorpe
     [not found]                             ` <7sikrilf3ik3fjsgppqxh9gn.1451043246057@email.android.com>
     [not found]                               ` <CAMHdiBDv9mScD+5o90OQ_tmAKw9o48_jfao6W+EBOZkUg+wReA@mail.gmail.com>
     [not found]                                 ` <CAMHdiBDv9mScD+5o90OQ_tmAKw9o48_jfao6W+EBOZkUg+wReA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-12-25 16:46                                   ` Liran Liss
     [not found]                                     ` <CAMHdiBC75n+u9BSMsKxJwcaBnGL68_3UBeQQtHp_CD5KGcUTnQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-01-05 17:46                                       ` Jason Gunthorpe
     [not found]                                         ` <20160105174636.GD16269-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-01-06  6:08                                           ` Christoph Hellwig
     [not found]                                             ` <20160106060806.GA16509-jcswGhMUV9g@public.gmane.org>
2016-01-06 15:10                                               ` Sagi Grimberg
     [not found]                                                 ` <568D2E4E.5020806-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2016-01-06 16:59                                                   ` Jason Gunthorpe
2015-11-22 17:46   ` [PATCH 11/11] IB: provide better access flags for fast registrations Christoph Hellwig
     [not found]     ` <1448214409-7729-12-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2015-11-23 15:09       ` Chuck Lever
     [not found]         ` <EE465F12-A5F6-4C95-A77C-199DFF8F77BD-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2015-11-23 15:49           ` Christoph Hellwig
2015-11-23 18:58       ` Jason Gunthorpe
     [not found]         ` <20151123185829.GE32085-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-11-23 19:44           ` Christoph Hellwig
2015-11-23  9:03   ` memory registration updates Sagi Grimberg
     [not found]     ` <5652D66E.5070600-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-11-23 14:16       ` Christoph Hellwig
     [not found]         ` <20151123141650.GA11116-jcswGhMUV9g@public.gmane.org>
2015-11-23 15:17           ` Sagi Grimberg
     [not found]             ` <56532E0A.20907-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-11-23 19:43               ` Christoph Hellwig
2015-11-23 15:06   ` Steve Wise

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