From owner-freebsd-net@freebsd.org Wed Sep 13 13:43:51 2017 Return-Path: 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 E5C50E21EA5 for ; Wed, 13 Sep 2017 13:43:51 +0000 (UTC) (envelope-from dhorn2000@gmail.com) Received: from mail-yw0-x22a.google.com (mail-yw0-x22a.google.com [IPv6:2607:f8b0:4002:c05::22a]) (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 A2CDC64CF8 for ; Wed, 13 Sep 2017 13:43:51 +0000 (UTC) (envelope-from dhorn2000@gmail.com) Received: by mail-yw0-x22a.google.com with SMTP id v72so611858ywa.3 for ; Wed, 13 Sep 2017 06:43:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=rjM/dROz385YBs2bYuxQsHSw0vGIqCJdCIJRZ5eINx0=; b=IvlP8lPCDGa7geDUmqMTXsd/MJmF41EVAMo/mEea5BMgRvbjlWDg/Ya6StML4dGj7n kTiOHpKq9M9pIr95bjcIoutO0rZGU/+3hY6Wu+IzNKHdyHUYcUw8GDK80JRJ/WuVzvfe AfsjZiyyPa1jtsURVSUsqRRZXH9EJPYLSB2SK6fstHSg95HPlkDC69ZAsHeNyqO3qd+8 2zEoAEB81hkaXTVWTjCwepnmjzu7eT+63YvcTwWzSM4UBJyS8mcTbT/atIQaQMdWOqFT RhPoVYdv+Khd/OQGuEkTp2cCdxuBFr/JQ39WhtyjTPhZVjqJRiuImxpStoyVkCYjqF0J heQQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=rjM/dROz385YBs2bYuxQsHSw0vGIqCJdCIJRZ5eINx0=; b=fdsThKYDcMztmkEVRWhzTyQuYvg5HDjB0Uf7Fbi+0ME1jMA9w/JN3vO9ea2leSV/AZ 9IDOFk/BPKg/I9hhGQ3tqFJf2hVyLj9k17OnONrKpdVEM01tK66gGJ0ROiLXz0BV0Ui7 tuig1lAjoCq04jR7QJRM1bk1zVfCE7uzH0DaPSUCpB/ywgO2iomoHgxt0nXwqSfQA7oX bekWLgV8EvMyzZG3vSZMXpCwoGXNucQo3ab5UFPyk0DuCN5xxqF2dERU4WOFVWkrzeIr rt96GKQXKQJsee+2/7Vj+jdw34AjLlZJUMQC3n+RaLqptiW0Kg/nYAySByxb/9P0Mmsj /yug== X-Gm-Message-State: AHPjjUhJ8y8JP0lmbn7/rEOUZUGq+fFh0pkrG7DyMYwC+1W7Y61xD05Q t34mX44/xffbyhYbQwqjdjnq13RPwZXLRCL9H+4= X-Google-Smtp-Source: ADKCNb4SqzxLrCs1Ku6PmM52eixfXxdPhaOeG5w9sZuT8mwRXyLD/duR7A7+vIrhaP198+jIHAnbQibAaoi2CJhPcxA= X-Received: by 10.129.227.2 with SMTP id q2mr13170559ywl.211.1505310230922; Wed, 13 Sep 2017 06:43:50 -0700 (PDT) MIME-Version: 1.0 Received: by 10.37.189.209 with HTTP; Wed, 13 Sep 2017 06:43:50 -0700 (PDT) In-Reply-To: References: From: David Horn Date: Wed, 13 Sep 2017 09:43:50 -0400 Message-ID: Subject: Re: Splitting Mellanox ConnectX-4 interface using breakout cables To: "Andrey V. Elsukov" Cc: freebsd-net@freebsd.org Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.23 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Sep 2017 13:43:52 -0000 I was under the impression that these Mellanox 40G->4x10G breakout cables were for the Mellanox switch side (not Mellanox NIC) to provide more flexible utilization options for the switch. I have never heard of doing this from the 40G NIC (on any OS). Please reply if you have seen this working on *any* OS from the Mellanox 40G NIC, as I am curious as well and have a both ConnectX-3 and -4 HW. -Dave On Wed, Sep 13, 2017 at 7:00 AM, Andrey V. Elsukov wrote: > Hi All, > > we are wondering, is it possible to use such configuration under > FreeBSD? I.e. split one mce interface 40G => 4x10G or 100G => 4x25G? > > -- > WBR, Andrey V. Elsukov > >