From owner-freebsd-net@freebsd.org  Sat Oct 10 14:59:38 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 BA2699D267C;
 Sat, 10 Oct 2015 14:59:38 +0000 (UTC)
 (envelope-from rizzo.unipi@gmail.com)
Received: from mail-lb0-x229.google.com (mail-lb0-x229.google.com
 [IPv6:2a00:1450:4010:c04::229])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (Client CN "smtp.gmail.com",
 Issuer "Google Internet Authority G2" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id 4B915E3B;
 Sat, 10 Oct 2015 14:59:38 +0000 (UTC)
 (envelope-from rizzo.unipi@gmail.com)
Received: by lbbwt4 with SMTP id wt4so106921944lbb.1;
 Sat, 10 Oct 2015 07:59:36 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:sender:date:message-id:subject:from:to:cc:content-type;
 bh=QueWrcmBH9IzrmxPDJeDs/Z1YwVrPxeYvBDmMN1ndg0=;
 b=UcbadvgniHlgFUNtiTJJfGAVMndHwhCQasqQtifmbjhS3uP4t2xQAiJArECB4ljGd/
 PgONVHiJBhgwDCJzKWpOIQI9PuuIOZ2UuxW4K4ziaIM0lU22U1SyRLYXSjTB9k61sFXp
 puxCdIJEViTa9Rv/0B+44iNmZE2Z023jTBy7lTVKrE8e5TRoJrKdd3KxdK2PgPrCD1e6
 QcPpMfhic8Q2hdjOzKUiT+XuSkMQen9PktUlsb9SvS9KdMLojpTRUbp3LdtySHQE7epA
 Xc/QqpWcEP5qmh6dxhVJ/TLcwSPAid/R/K/AEniGxf+MEy+4ekQtj1ZXkxP+7znDN3e0
 k0cw==
MIME-Version: 1.0
X-Received: by 10.112.134.73 with SMTP id pi9mr8835510lbb.83.1444489175975;
 Sat, 10 Oct 2015 07:59:35 -0700 (PDT)
Sender: rizzo.unipi@gmail.com
Received: by 10.114.96.168 with HTTP; Sat, 10 Oct 2015 07:59:35 -0700 (PDT)
Date: Sat, 10 Oct 2015 16:59:35 +0200
X-Google-Sender-Auth: 7V2hLJ343lt8wuaRDI8Gx9B45sI
Message-ID: <CA+hQ2+hFHeS_+CLS6Y7XSVUPQjppd6pPmgPHWy8fw+A5hK+MRQ@mail.gmail.com>
Subject: nice stuff from cloudflare (and, we need something like ethtool!)
From: Luigi Rizzo <rizzo@iet.unipi.it>
To: FreeBSD Current <current@freebsd.org>
Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>
Content-Type: text/plain; charset=UTF-8
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: Sat, 10 Oct 2015 14:59:38 -0000

the nice folks at cloudflare implemented a nice feature
in netmap that puts some queues of the NIC in netmap mode
leaving others attached to the host stack

https://blog.cloudflare.com/single-rx-queue-kernel-bypass-with-netmap/

and use ethtool (and native NIC filters) to steer traffic around.
[FWIW, the chelsio native netmap driver is similar except that
the netmap queue has a different MAC address]

While their code was developed on linux, it should run
almost unmodified on FreeBSD (and we plan to import it soon),
except for the fact that we don't have ethtool hence no
device-independent mechanism to configure traffic steering.

We really need to address the latter.

cheers
luigi


-- 
-----------------------------------------+-------------------------------
 Prof. Luigi RIZZO, rizzo@iet.unipi.it  . Dip. di Ing. dell'Informazione
 http://www.iet.unipi.it/~luigi/        . Universita` di Pisa
 TEL      +39-050-2217533               . via Diotisalvi 2
 Mobile   +39-338-6809875               . 56122 PISA (Italy)
-----------------------------------------+-------------------------------