From owner-freebsd-current@FreeBSD.ORG  Mon Aug  5 18:19:06 2013
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTP id A99616D;
 Mon,  5 Aug 2013 18:19:06 +0000 (UTC)
 (envelope-from adrian.chadd@gmail.com)
Received: from mail-wg0-x231.google.com (mail-wg0-x231.google.com
 [IPv6:2a00:1450:400c:c00::231])
 (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits))
 (No client certificate requested)
 by mx1.freebsd.org (Postfix) with ESMTPS id E01B52E0B;
 Mon,  5 Aug 2013 18:19:05 +0000 (UTC)
Received: by mail-wg0-f49.google.com with SMTP id y10so2694972wgg.4
 for <multiple recipients>; Mon, 05 Aug 2013 11:19:04 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:sender:in-reply-to:references:date
 :x-google-sender-auth:message-id:subject:from:to:cc:content-type;
 bh=tMzw5Vr38AmxBMmKKa5qf7JQp1ahPyDqUdmn+Y8bX9o=;
 b=kLNFSK2UD4LQN0lR0UjIMtPl24ZHTSkSmrc1tygIjL6YVaugIqgTKANlwt/lF3/JAX
 9Y/P+YmAVyfiAiK0GPX7jXrbCltQSur1i6DbzDTOe7F9Nl4HH9h9i83A9b6ZHrgy+ANY
 gmqPNqVJ9PmaGtF5Rg4xv/koCVMQRs24rJlDiZmXgYOHaWtfQZh+PDT5ecczOddArxAX
 qL5y0AMjHdku6E2ADwWLY22DdRxWOUGhvYBUJWcJvMc92Pmu6uVBXEslpM+ZQpMiJrQ1
 bW5zb5IXVKRIHx8CvcgVIw+xvA/vcYsXADII5UPeZV0rkgVd7QE2nKlyHBvwmyXQqi23
 yyxg==
MIME-Version: 1.0
X-Received: by 10.194.201.202 with SMTP id kc10mr14215519wjc.1.1375726744177; 
 Mon, 05 Aug 2013 11:19:04 -0700 (PDT)
Sender: adrian.chadd@gmail.com
Received: by 10.217.116.136 with HTTP; Mon, 5 Aug 2013 11:19:04 -0700 (PDT)
In-Reply-To: <CA+hQ2+hAcyi=uFcOLV1YNMfDAmdhJoTtqtgpb=R_-RKSmWX9FQ@mail.gmail.com>
References: <20130805082307.GA35162@onelab2.iet.unipi.it>
 <2034715395.855.1375714772487.JavaMail.root@daemoninthecloset.org>
 <CAJ-VmokT6YKPR7CXsoCavEmWv3W8urZu4eBVgKWaj9iMaVJFZg@mail.gmail.com>
 <CA+hQ2+huoCCweq7fjoYmH3nyhmhb5DzukEdPSMtaJEWa8Ft0JQ@mail.gmail.com>
 <51FFDD1E.1000206@FreeBSD.org>
 <CAJ-Vmo=Q9AqdBJ0+4AiX4+WreYuZx6VGGYw=MZ4XhMB1P2yMww@mail.gmail.com>
 <CA+hQ2+gZTGmrBKTOAeFnNma4DQXbAy_y8NZrovpWqm_5BJTWhQ@mail.gmail.com>
 <CAFOYbckJaZYQj2D4k41Nmjm9urue9_CDcdQ3yhRddWx0SzXE6g@mail.gmail.com>
 <CA+hQ2+hAcyi=uFcOLV1YNMfDAmdhJoTtqtgpb=R_-RKSmWX9FQ@mail.gmail.com>
Date: Mon, 5 Aug 2013 11:19:04 -0700
X-Google-Sender-Auth: Ym1h1UimcX5x_7BkjBd_OP4xP4g
Message-ID: <CAJ-VmomtmPcN_ebV2AEiRz9sVyYRcvo9Kt0HvhazSCuHpGk3Ew@mail.gmail.com>
Subject: Re: [net] protecting interfaces from races between control and data ?
From: Adrian Chadd <adrian@freebsd.org>
To: Luigi Rizzo <rizzo@iet.unipi.it>
Content-Type: text/plain; charset=ISO-8859-1
Cc: FreeBSD current mailing list <current@freebsd.org>,
 Bryan Venteicher <bryanv@daemoninthecloset.org>,
 Navdeep Parhar <np@freebsd.org>, net@freebsd.org,
 Giuseppe Lettieri <g.lettieri@iet.unipi.it>, Jack Vogel <jfvogel@gmail.com>
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
 <freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
 <mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 05 Aug 2013 18:19:06 -0000

No, brian said two things:

* the flag, protected by the core lock
* per-queue flags



-adrian