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From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
To: "Hefty, Sean" <sean.hefty@intel.com>
Cc: Sagi Grimberg <sagi@grimberg.me>,
	"Weiny, Ira" <ira.weiny@intel.com>,
	Christoph Hellwig <hch@lst.de>,
	"dledford@redhat.com" <dledford@redhat.com>,
	"bart.vanassche@sandisk.com" <bart.vanassche@sandisk.com>,
	"swise@opengridcomputing.com" <swise@opengridcomputing.com>,
	"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
	"target-devel@vger.kernel.org" <target-devel@vger.kernel.org>
Subject: Re: [PATCH 02/12] IB/cma: pass the port number to ib_create_qp
Date: Thu, 28 Apr 2016 14:07:59 -0600	[thread overview]
Message-ID: <20160428200759.GA32110@obsidianresearch.com> (raw)
In-Reply-To: <1828884A29C6694DAF28B7E6B8A82373AB047108@ORSMSX109.amr.corp.intel.com>

On Thu, Apr 28, 2016 at 07:43:59PM +0000, Hefty, Sean wrote:
> > > HCH and I complained about this per-port distinction in several private
> > > conversations. I'd really love to see it go away too.
> > 
> > I'm in support of eliminating them. One protocol per device.
> 
> I'm slow reading this thread, but there are devices today
> (e.g. qlogic) that support multiple protocols (e.g. iwarp, roce,
> rocev2).  Even the qib and opa drivers do, if you include psm as a
> separate protocol from ib.

I see several litmus tests for what kinds of ports can be combined
into a device (eg the 'protocol'):

1) Various cap tests are the same on every port. Particularly the
   iWarp special behaviours we are talking about here.
2) AHs are not port-specific, so the AH addressing format must be
   defined by the device. Thus IB and iWarp cannot be combined.
3) Verbs APM must work across ports. So eg rocee and IB cannot be
   combined since they use a different CM process.

Multi-port really only exists to support APM, if APM doesn't work then
drivers don't need to create multi-port devices.

Jason

  reply	other threads:[~2016-04-28 20:07 UTC|newest]

Thread overview: 66+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-11 21:32 generic RDMA READ/WRITE API V6 Christoph Hellwig
2016-04-11 21:32 ` [PATCH 02/12] IB/cma: pass the port number to ib_create_qp Christoph Hellwig
     [not found]   ` <1460410360-13104-3-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-04-15 17:55     ` Sagi Grimberg
2016-04-19  3:14   ` Ira Weiny
2016-04-19 17:30     ` Jason Gunthorpe
2016-04-19 18:38       ` Christoph Hellwig
     [not found]         ` <20160419183830.GB1211-jcswGhMUV9g@public.gmane.org>
2016-04-28 21:05           ` Doug Ledford
     [not found]       ` <20160419173032.GD20844-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-04-19 18:49         ` Sagi Grimberg
2016-04-19 19:24           ` Jason Gunthorpe
     [not found]             ` <20160419192430.GB27028-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-04-19 19:41               ` Steve Wise
2016-04-19 20:05                 ` 'Christoph Hellwig'
2016-04-19 20:21                   ` Jason Gunthorpe
     [not found]                   ` <20160419200555.GA2561-jcswGhMUV9g@public.gmane.org>
2016-04-19 20:26                     ` Steve Wise
2016-04-21  3:11                       ` ira.weiny
2016-04-28 19:43               ` Hefty, Sean
2016-04-28 20:07                 ` Jason Gunthorpe [this message]
2016-04-28 21:53                   ` Hefty, Sean
2016-04-28 22:09                     ` Jason Gunthorpe
2016-04-28 23:23                       ` Hefty, Sean
2016-04-28 23:49                         ` Jason Gunthorpe
2016-04-28 23:25                       ` Weiny, Ira
     [not found]                         ` <2807E5FD2F6FDA4886F6618EAC48510E22EC858F-8k97q/ur5Z2krb+BlOpmy7fspsVTdybXVpNB7YpNyf8@public.gmane.org>
2016-04-29  0:01                           ` Jason Gunthorpe
2016-04-11 21:32 ` [PATCH 03/12] IB/core: allow passing mapping an offset into the SG in ib_map_mr_sg Christoph Hellwig
     [not found]   ` <1460410360-13104-4-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-04-15 17:56     ` Sagi Grimberg
2016-04-11 21:32 ` [PATCH 04/12] IB/core: add a helper to check for READ WITH INVALIDATE support Christoph Hellwig
     [not found]   ` <1460410360-13104-5-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-04-15 17:56     ` Sagi Grimberg
2016-04-19  3:15   ` Ira Weiny
2016-04-11 21:32 ` [PATCH 05/12] IB/core: refactor ib_create_qp Christoph Hellwig
2016-04-17 20:00   ` Sagi Grimberg
     [not found]   ` <1460410360-13104-6-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-04-19  3:08     ` Ira Weiny
2016-04-11 21:32 ` [PATCH 07/12] IB/core: add a need_inval flag to struct ib_mr Christoph Hellwig
     [not found]   ` <1460410360-13104-8-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-04-17 20:01     ` Sagi Grimberg
2016-04-19  3:20   ` Ira Weiny
2016-04-11 21:32 ` [PATCH 08/12] IB/core: generic RDMA READ/WRITE API Christoph Hellwig
     [not found]   ` <1460410360-13104-9-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-04-12 23:52     ` Bart Van Assche
     [not found]       ` <570D8A42.9040107-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
2016-04-13 13:50         ` Christoph Hellwig
     [not found] ` <1460410360-13104-1-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-04-11 21:32   ` [PATCH 01/12] IB/mlx5: Expose correct max_sge_rd limit Christoph Hellwig
     [not found]     ` <1460410360-13104-2-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-04-17 13:53       ` Leon Romanovsky
     [not found]         ` <20160417135341.GC6349-2ukJVAZIZ/Y@public.gmane.org>
2016-04-17 18:06           ` Christoph Hellwig
2016-04-11 21:32   ` [PATCH 06/12] IB/core: add a simple MR pool Christoph Hellwig
2016-04-17 20:01     ` Sagi Grimberg
2016-04-19  3:19     ` Ira Weiny
2016-04-11 21:32   ` [PATCH 09/12] target: enhance and export target_alloc_sgl/target_free_sgl Christoph Hellwig
2016-04-11 21:32 ` [PATCH 10/12] IB/srpt: convert to the generic RDMA READ/WRITE API Christoph Hellwig
2016-04-13 18:57   ` Bart Van Assche
2016-04-14 13:32     ` Christoph Hellwig
2016-04-28 21:02       ` Doug Ledford
     [not found]         ` <57227A6D.4000802-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-04-29  6:34           ` Christoph Hellwig
     [not found]             ` <20160429063443.GA18893-jcswGhMUV9g@public.gmane.org>
2016-04-29 14:44               ` Doug Ledford
2016-04-11 21:32 ` [PATCH 11/12] IB/core: add RW API support for signature MRs Christoph Hellwig
     [not found]   ` <1460410360-13104-12-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-04-22 21:53     ` Bart Van Assche
2016-04-11 21:32 ` [PATCH 12/12] IB/isert: convert to the generic RDMA READ/WRITE API Christoph Hellwig
     [not found]   ` <1460410360-13104-13-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-04-28 21:04     ` Doug Ledford
2016-04-29 11:46       ` Sagi Grimberg
     [not found]         ` <572349AA.2070407-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
2016-04-29 14:45           ` Doug Ledford
     [not found]             ` <e7959da7-79ca-0422-fbc9-9b3814516e1b-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-04-29 16:42               ` Leon Romanovsky
2016-04-12 18:31 ` generic RDMA READ/WRITE API V6 Steve Wise
2016-04-22 22:29 ` Bart Van Assche
     [not found]   ` <571AA5C8.4080502-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
2016-05-02 15:15     ` Christoph Hellwig
     [not found]       ` <20160502151535.GA520-jcswGhMUV9g@public.gmane.org>
2016-05-02 19:08         ` Bart Van Assche
2016-05-02 22:14           ` Bart Van Assche
2016-05-03  8:40             ` Christoph Hellwig
2016-05-03 16:10               ` Bart Van Assche
     [not found]           ` <5727A5C7.1090009-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
2016-05-03 14:31             ` Christoph Hellwig
     [not found]               ` <20160503143104.GA30342-jcswGhMUV9g@public.gmane.org>
2016-05-03 21:23                 ` Bart Van Assche
2016-04-18 20:14 generic RDMA READ/WRITE API V7 Christoph Hellwig
2016-04-18 20:14 ` [PATCH 02/12] IB/cma: pass the port number to ib_create_qp Christoph Hellwig

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