From owner-freebsd-net@FreeBSD.ORG  Tue Oct 16 13:20:05 2012
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
Delivered-To: net@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
 by hub.freebsd.org (Postfix) with ESMTP id D591ADD5;
 Tue, 16 Oct 2012 13:20:05 +0000 (UTC)
 (envelope-from rysto32@gmail.com)
Received: from mail-vb0-f54.google.com (mail-vb0-f54.google.com
 [209.85.212.54])
 by mx1.freebsd.org (Postfix) with ESMTP id 531228FC0C;
 Tue, 16 Oct 2012 13:20:05 +0000 (UTC)
Received: by mail-vb0-f54.google.com with SMTP id v11so8234287vbm.13
 for <multiple recipients>; Tue, 16 Oct 2012 06:20:04 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:in-reply-to:references:date:message-id:subject:from:to
 :cc:content-type;
 bh=1bT0WmRPa07jbTKhIxzJLWQzJTt2QP7ibYzX+c+Afc8=;
 b=FclWLbXi1zlsY+fNTQ8D8SNHM7dlHiQk1TxSVacObLCpzo1YPBJ03dLpuLxbgC8TQB
 qk/1IYFWnHU+CN2NkoCmYghG/GRXrm9oLVxwzX7MGsG2CdLB5pz+bT/XW13liMYyIvT5
 /P7qCwICj46d6o369cmR14Vu894XFDmHdspmGWAHwn5T48ZeDcLCoh4YPI6uPDQFr/mI
 a4rgS2KLck44C8dYlEOx/yizJnGKuX0kK33kK5Srzk3Z5rx87h041vCZo66oLLZUhAnH
 lnVC8wxoOsKAmlIIMLU4X8/CXaRYkkH+jns4sNpYGTDzUn/CbSx7IQekxM5eXugvjzJR
 Vl2w==
MIME-Version: 1.0
Received: by 10.52.68.7 with SMTP id r7mr7101958vdt.96.1350393604422; Tue, 16
 Oct 2012 06:20:04 -0700 (PDT)
Received: by 10.58.207.114 with HTTP; Tue, 16 Oct 2012 06:20:04 -0700 (PDT)
In-Reply-To: <20121016124733.GC89655@glebius.int.ru>
References: <5079A9A1.4070403@FreeBSD.org> <20121015162926.GV89655@FreeBSD.org>
 <CAFMmRNxT=GWxc6r7B81ENjzwJmfea3016Sh-DxJEGBwybM0QwQ@mail.gmail.com>
 <507D4F11.2030704@FreeBSD.org>
 <CAFMmRNy1h86ZXAH4oK+LOK6_VeTsbo=d6oYk669bisKfHbJ56A@mail.gmail.com>
 <20121016124733.GC89655@glebius.int.ru>
Date: Tue, 16 Oct 2012 09:20:04 -0400
Message-ID: <CAFMmRNzA23r_a0nrnsUN8ZoHGL5c7OF1-nCqWpN42FLc50d7eg@mail.gmail.com>
Subject: Re: ixgbe & if_igb RX ring locking
From: Ryan Stone <rysto32@gmail.com>
To: Gleb Smirnoff <glebius@freebsd.org>
Content-Type: text/plain; charset=ISO-8859-1
Cc: "Alexander V. Chernikov" <melifaro@freebsd.org>,
 Jack Vogel <jfvogel@gmail.com>, net@freebsd.org
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 16 Oct 2012 13:20:05 -0000

On Tue, Oct 16, 2012 at 8:47 AM, Gleb Smirnoff <glebius@freebsd.org> wrote:
> Can you please provide hints how can SIOCADDMULTI lead to obtaining RX
> lock in the stock driver?

It doesn't.  But it does acquire the core lock, and the core lock is
acquired before the RX lock (in ixgbe_init, for instance).