From owner-svn-src-head@freebsd.org  Wed Dec 21 16:04:22 2016
Return-Path: <owner-svn-src-head@freebsd.org>
Delivered-To: svn-src-head@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id E1C02C8AEDA;
 Wed, 21 Dec 2016 16:04:22 +0000 (UTC)
 (envelope-from rb743@hermes.cam.ac.uk)
Received: from ppsw-43.csi.cam.ac.uk (ppsw-43.csi.cam.ac.uk [131.111.8.143])
 by mx1.freebsd.org (Postfix) with ESMTP id AD3EE18FF;
 Wed, 21 Dec 2016 16:04:22 +0000 (UTC)
 (envelope-from rb743@hermes.cam.ac.uk)
X-Cam-AntiVirus: no malware found
X-Cam-ScannerInfo: http://help.uis.cam.ac.uk/email-scanner-virus
Received: from sc1.bsdpad.com ([163.172.212.18]:16575)
 by ppsw-43.csi.cam.ac.uk (smtp.hermes.cam.ac.uk [131.111.8.159]:587)
 with esmtpsa (LOGIN:rb743) (TLSv1:ECDHE-RSA-AES256-SHA:256)
 id 1cJjNH-000328-mT (Exim 4.86_36-e07b163)
 (return-path <rb743@hermes.cam.ac.uk>); Wed, 21 Dec 2016 16:04:15 +0000
Date: Wed, 21 Dec 2016 16:02:53 +0000
From: Ruslan Bukin <ruslan.bukin@cl.cam.ac.uk>
To: John Baldwin <jhb@freebsd.org>
Cc: Ruslan Bukin <br@freebsd.org>, src-committers@freebsd.org,
 svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject: Re: svn commit: r310330 - in head: share/man/man4 sys/conf
 sys/dev/xdma
Message-ID: <20161221160253.GA4455@bsdpad.com>
References: <201612201802.uBKI27oN091165@repo.freebsd.org>
 <1904181.V85ZRTRTAB@ralph.baldwin.cx>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <1904181.V85ZRTRTAB@ralph.baldwin.cx>
User-Agent: Mutt/1.6.1 (2016-04-27)
Sender: "R. Bukin" <rb743@hermes.cam.ac.uk>
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
 <svn-src-head.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head/>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 21 Dec 2016 16:04:23 -0000

On Tue, Dec 20, 2016 at 12:50:11PM -0800, John Baldwin wrote:
> On Tuesday, December 20, 2016 06:02:07 PM Ruslan Bukin wrote:
> > Author: br
> > Date: Tue Dec 20 18:02:07 2016
> > New Revision: 310330
> > URL: https://svnweb.freebsd.org/changeset/base/310330
> > 
> > Log:
> >   Add xDMA -- the DMA abstraction layer, initial verison.
> >   
> >   xDMA is a DMA framework designed to abstract the interaction
> >   between device drivers and DMA engines.
> >   
> >   Project wiki: https://wiki.freebsd.org/xdma
> >   
> >   Sponsored by:	DARPA, AFRL
> >   Differential Revision:	https://reviews.freebsd.org/D8807
> 
> It probably would have been a good idea to get some design review of this on
> arch@ before committing.  In particular, I believe from earlier discussions
> that you want to build a general framework that things like ioat(4) can hook
> into.  arch@ would give you a broader audience for working out the
> abstractions and interfaces.
> 

Yep, you probably right. I found lack of interest from the list of reviewers
I added on phabricator, so decided to go, but may be list was not 100%
pervasive.

Anyway it is just 673 lines of code and I continue working on it.
I plan to add scatter-gathering type of transfer and SoftDMA(®) driver,
so any review of this or upcoming changes would be appreciated.

Ruslan