From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <stephen@networkplumber.org>
Received: from mail-pg0-f65.google.com (mail-pg0-f65.google.com [74.125.83.65])
 by dpdk.org (Postfix) with ESMTP id 51E892030
 for <dev@dpdk.org>; Wed, 13 Dec 2017 22:10:13 +0100 (CET)
Received: by mail-pg0-f65.google.com with SMTP id y6so1896770pgp.4
 for <dev@dpdk.org>; Wed, 13 Dec 2017 13:10:13 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=networkplumber-org.20150623.gappssmtp.com; s=20150623;
 h=date:from:to:cc:subject:message-id:in-reply-to:references
 :mime-version:content-transfer-encoding;
 bh=K4pa58kUvgzMzp1xe46HIczDUCRDWR17RGV2Mw3ccf4=;
 b=t2zU/oIw6861+PKjYomKXRe6oqGHKo7TixVIFUosTrIyhnfy8FLGJ9syW6YXJM2m6g
 NXCct1ehV5x5cL9GmyvtFgKxNBso0MjB3/Zx3CseruCtrRRN7RIuiGS7zr/wpSj5r3tl
 KaykqYLfIo7OPS1+fCw9YAyeyg/e6VhS1T+tsREaGeaO/GhWm/95Rp/xWRigU21Yr2NX
 UCiwgNPu0dZTl+4pseTQ189dHxOD7qWWNefW2f6sKKS5GWrt2/ExIYDwNsXp4VFnIs4G
 0zPz7Du2eYYtYu4Fb/pNIXNyd2wb1yoYp3mOy0q5QRdltuCiTDcuM3uX/4av43F+jqEI
 6Hgw==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20161025;
 h=x-gm-message-state:date:from:to:cc:subject:message-id:in-reply-to
 :references:mime-version:content-transfer-encoding;
 bh=K4pa58kUvgzMzp1xe46HIczDUCRDWR17RGV2Mw3ccf4=;
 b=bIO7BGJV2YNVOOc5KIq8Nlq/OcNp/ObahCaDI2fTNfFviuyVJJI84zAuHPf3S5+7wI
 GU/yz9OEmolP5plkANSLJD+tYnhcl6yu3Q+x0egqw3i4C+RoYVGUsfsTv4g7Vk2EgyuY
 FMs5DD4F2XKUfdkcIsOxUyf2JyJyAMXEQXZ4FyV2LYx8bv/YJ8Xq58+B9yyckdrNJn6p
 LzSdCV993Ow7LdSxaYz6xeU+JhwZ3Gxm3d4DGHZQ3Tl6hRqHOt4PUeBg8PcJTIB7PsaL
 QOevAh5Xyt8BsxC2G5PjdHZiKZTcAuVe0z+Db1o6qPISI+3wZ3UmHPXTwotTmLfWjV/v
 jOKQ==
X-Gm-Message-State: AKGB3mJn1oQdc1HX2wC4lYpYVoGLotq+AvjNKnCU5bWwtYGbU87XqweM
 4JiO34C5HAN6TCbdkQIHb3OXjw==
X-Google-Smtp-Source: ACJfBov+2/cxBd5RDhJvX/NjgMO5fuPgKI5m1L9PXcbBfcbkq99VLptL71ddy/wacA/pZvTq8Ld40g==
X-Received: by 10.84.143.34 with SMTP id 31mr7263262ply.446.1513199412287;
 Wed, 13 Dec 2017 13:10:12 -0800 (PST)
Received: from xeon-e3 (76-14-207-240.or.wavecable.com. [76.14.207.240])
 by smtp.gmail.com with ESMTPSA id y1sm4403476pgq.41.2017.12.13.13.10.11
 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256);
 Wed, 13 Dec 2017 13:10:12 -0800 (PST)
Date: Wed, 13 Dec 2017 13:10:09 -0800
From: Stephen Hemminger <stephen@networkplumber.org>
To: Thomas Monjalon <thomas@monjalon.net>
Cc: Ricardo Roldan <rroldan@bequant.com>, users@dpdk.org, dev@dpdk.org
Message-ID: <20171213131009.18a4f821@xeon-e3>
In-Reply-To: <1581834.O1SaQGJnzN@xps>
References: <fb117eef-ddad-67f6-8e0f-6febdbc0aeed@bequant.com>
 <7a3a2174-831f-caa8-ed33-0f06133c96a2@bequant.com>
 <20171213090952.495bfb1b@xeon-e3> <1581834.O1SaQGJnzN@xps>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Subject: Re: [dpdk-dev] [dpdk-users] attach/detach on secondary process
X-BeenThere: dev@dpdk.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: DPDK patches and discussions <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
X-List-Received-Date: Wed, 13 Dec 2017 21:10:13 -0000

On Wed, 13 Dec 2017 22:00:48 +0100
Thomas Monjalon <thomas@monjalon.net> wrote:

> 13/12/2017 18:09, Stephen Hemminger:
> > Many DPDK drivers require that setup and initialization be done by
> > the primary process. This is mostly to avoid dealing with concurrency since
> > there can be multiple secondary processes.  
> 
> I think we should consider this limitation as a bug.
> We must allow a secondary process to initialize a device.
> The race in device creation must be fixed.
> 

Secondary processes should be able to do setup.
But it is up to the application not to do it concurrently from multiple
processes.