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From: Jason Gunthorpe <jgg-uk2M96/98Pc@public.gmane.org>
To: Alex Margolin <alexma-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Cc: Yuval Shaia <yuval.shaia-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>,
	Marcel Apfelbaum <marcel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	"linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [RFC rdma-core 2/2] verbs: Introduce non-contiguous memory registration
Date: Thu, 25 Jan 2018 09:07:25 -0700	[thread overview]
Message-ID: <20180125160725.GC10706@ziepe.ca> (raw)
In-Reply-To: <VI1PR05MB12787572593F02F05AA20DE1B9E10-79XLn2atqDMOK6E67s+DINqRiQSDpxhJvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>

On Thu, Jan 25, 2018 at 12:43:05PM +0000, Alex Margolin wrote:

> Actually, I realized it can be implemented with the proposed API.
> All that is missing is a capability bit and a flag for set_layout_*,
> and the implementation could work as follows (changes relative to SG example):

This can work..

> In this case calling ibv_mr_set_layout_sg() will cause an internal registration
> replacing the ibv_reg_mr calls for mr1 and mr2, and the registration will be stored
> in mr3.

Yuval is right though, in cases where the buffers are page aligned we
can ask the kernel to create a single normal MR supported by all HW.

Could be a useful feature.

Jason
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  parent reply	other threads:[~2018-01-25 16:07 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-04 17:47 [RFC rdma-core 1/2] Registering non-contiguous memory Alex Margolin
     [not found] ` <1515088046-26605-1-git-send-email-alexma-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2018-01-04 17:47   ` [RFC rdma-core 2/2] verbs: Introduce non-contiguous memory registration Alex Margolin
     [not found]     ` <1515088046-26605-2-git-send-email-alexma-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2018-01-11 12:22       ` Yuval Shaia
2018-01-11 16:44         ` Jason Gunthorpe
     [not found]           ` <20180111164455.GA1309-uk2M96/98Pc@public.gmane.org>
2018-01-22 15:59             ` Alex Margolin
     [not found]               ` <VI1PR05MB1278C4C4FF78B4B1A551252EB9EC0-79XLn2atqDMOK6E67s+DINqRiQSDpxhJvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2018-01-23 20:29                 ` Yuval Shaia
2018-01-25 12:43                   ` Alex Margolin
     [not found]                     ` <VI1PR05MB12787572593F02F05AA20DE1B9E10-79XLn2atqDMOK6E67s+DINqRiQSDpxhJvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2018-01-25 16:07                       ` Jason Gunthorpe [this message]
2018-01-28 20:37                       ` Yuval Shaia
2018-01-29 17:27                         ` Jason Gunthorpe
     [not found]                           ` <20180129172717.GW23852-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2018-01-30 11:35                             ` Marcel Apfelbaum
     [not found]                               ` <12d04e1b-6024-0763-f5c5-46ca8b0823a6-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-01-30 15:42                                 ` Jason Gunthorpe
     [not found]                                   ` <20180130154200.GD21679-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2018-01-31 12:27                                     ` Marcel Apfelbaum
     [not found]                                       ` <76b5a8cf-b3ed-c76d-6157-91fc5f6f2b35-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-01-31 18:38                                         ` Jason Gunthorpe
     [not found]                                           ` <20180131183810.GA23352-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2018-02-01 18:22                                             ` Marcel Apfelbaum
     [not found]                                               ` <dded9055-a329-9b9d-943a-7a60445e2ada-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-02-01 18:29                                                 ` Jason Gunthorpe
     [not found]                                                   ` <20180201182959.GN23352-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2018-02-01 18:45                                                     ` Marcel Apfelbaum
2018-01-25 13:10                   ` Alex Margolin

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