From owner-freebsd-net@freebsd.org  Thu Sep  3 15:00:46 2015
Return-Path: <owner-freebsd-net@freebsd.org>
Delivered-To: freebsd-net@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 7293B99E094
 for <freebsd-net@mailman.ysv.freebsd.org>;
 Thu,  3 Sep 2015 15:00:46 +0000 (UTC)
 (envelope-from glebius@FreeBSD.org)
Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org
 [IPv6:2001:1900:2254:206a::50:5])
 by mx1.freebsd.org (Postfix) with ESMTP id 55FEE991
 for <freebsd-net@freebsd.org>; Thu,  3 Sep 2015 15:00:46 +0000 (UTC)
 (envelope-from glebius@FreeBSD.org)
Received: by mailman.ysv.freebsd.org (Postfix)
 id 52F5099E091; Thu,  3 Sep 2015 15:00:46 +0000 (UTC)
Delivered-To: net@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 5288399E090
 for <net@mailman.ysv.freebsd.org>; Thu,  3 Sep 2015 15:00:46 +0000 (UTC)
 (envelope-from glebius@FreeBSD.org)
Received: from cell.glebius.int.ru (glebius.int.ru [81.19.69.10])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client CN "cell.glebius.int.ru", Issuer "cell.glebius.int.ru" (not verified))
 by mx1.freebsd.org (Postfix) with ESMTPS id CDACB98D;
 Thu,  3 Sep 2015 15:00:44 +0000 (UTC)
 (envelope-from glebius@FreeBSD.org)
Received: from cell.glebius.int.ru (localhost [127.0.0.1])
 by cell.glebius.int.ru (8.15.2/8.15.2) with ESMTPS id t83F0f1H016240
 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO);
 Thu, 3 Sep 2015 18:00:41 +0300 (MSK)
 (envelope-from glebius@FreeBSD.org)
Received: (from glebius@localhost)
 by cell.glebius.int.ru (8.15.2/8.15.2/Submit) id t83F0fmm016239;
 Thu, 3 Sep 2015 18:00:41 +0300 (MSK)
 (envelope-from glebius@FreeBSD.org)
X-Authentication-Warning: cell.glebius.int.ru: glebius set sender to
 glebius@FreeBSD.org using -f
Date: Thu, 3 Sep 2015 18:00:41 +0300
From: Gleb Smirnoff <glebius@FreeBSD.org>
To: Andriy Voskoboinyk <s3erios@gmail.com>, Adrian Chadd <adrian@freebsd.org>
Cc: "net@freebsd.org" <net@freebsd.org>
Subject: Re: mbufq-less iwn(4)
Message-ID: <20150903150041.GR1023@glebius.int.ru>
References: <20150901112043.GB1023@glebius.int.ru>
 <CAJ-Vmokn91fHQyg-AGqCgccRoMS89TuWpQ9RuxL+9nmgt+X2kQ@mail.gmail.com>
 <20150902060324.GF1023@glebius.int.ru>
 <op.x4d4ddkxiew4ia@localhost>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <op.x4d4ddkxiew4ia@localhost>
User-Agent: Mutt/1.5.23 (2014-03-12)
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.20
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <https://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: <https://lists.freebsd.org/mailman/listinfo/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 03 Sep 2015 15:00:46 -0000

On Thu, Sep 03, 2015 at 05:11:27PM +0300, Andriy Voskoboinyk wrote:
A> > A> Other thing - ic_transmit() also needs to handle fragments, like I do
A> > A> with ath. Ie, handing it a list of packets is actually a list of
A> > A> 802.11 fragments, rather than separate MPDUs.
A> > A>
A> > A> Another thing - we're modifying the mbufs (adding 802.11 data to it)
A> > A> before we pass them to the driver, and if the driver fails to
A> > A> transmit, we can't just pass it back up the net80211 stack to the tcp
A> > A> or udp layer..
A> >
A> > Sure, stack probably would need to strip the data. Anyway, that's
A> > a future task.
A> >
A> 
A> What about https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193569 ?

I'd leave that to you, guys :) I don't want to go knee deep into the
802.11, I'm just working on a "tiny" project of opaque struct ifnet :)

-- 
Totus tuus, Glebius.