From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Sagi Grimberg <sagig-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
Cc: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>,
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 14:09:39 -0700 [thread overview]
Message-ID: <20151222210939.GA8212@obsidianresearch.com> (raw)
In-Reply-To: <56798126.9000003-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
On Tue, Dec 22, 2015 at 06:58:14PM +0200, Sagi Grimberg wrote:
>
> >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.
Not in the new API.
If a ULP ever comes along that does need that then they can start with
two MRs and then eventually upgrade the kapi to have some kind of
efficient bidir MR mode.
What we've seen on the list lately is that every single ULP seems to
have technical problems running the stack properly. We need to get off
this idea that the spec has to govern the kapi - that didn't lead us
any place nice.
Jason
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next prev parent reply other threads:[~2015-12-22 21:09 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
[not found] ` <56798126.9000003-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-12-22 21:09 ` Jason Gunthorpe [this message]
[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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