Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933173AbbFIRA0 (ORCPT ); Tue, 9 Jun 2015 13:00:26 -0400 Received: from mailuogwdur.emc.com ([128.221.224.79]:49233 "EHLO mailuogwdur.emc.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752999AbbFIRAV (ORCPT ); Tue, 9 Jun 2015 13:00:21 -0400 X-DKIM: OpenDKIM Filter v2.4.3 mailuogwprd53.lss.emc.com t59H0ErL027779 X-DKIM: OpenDKIM Filter v2.4.3 mailuogwprd53.lss.emc.com t59H0ErL027779 From: "Hubbe, Allen" To: Bjorn Helgaas CC: "linux-ntb@googlegroups.com" , "linux-kernel@vger.kernel.org" , "linux-pci@vger.kernel.org" , Jon Mason , Dave Jiang Subject: RE: [PATCH v3 09/18] NTB: Add parameters for Intel SNB B2B addresses Thread-Topic: [PATCH v3 09/18] NTB: Add parameters for Intel SNB B2B addresses Thread-Index: AQHQosJxaviRiipy/kWrYixI0EQ6bZ2kpAaA//+9N3A= Date: Tue, 9 Jun 2015 16:59:57 +0000 Message-ID: <40F65EF2B5E2254199711F58E3ACB84D830FEEF3@MX104CL02.corp.emc.com> References: <20150609164217.GE23119@google.com> In-Reply-To: <20150609164217.GE23119@google.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.239.225.17] Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 X-Sentrion-Hostname: mailusrhubprd54.lss.emc.com X-RSA-Classifications: public Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by nfs id t59H0VBh030098 Content-Length: 856 Lines: 10 From: Bjorn Helgaas [mailto:bhelgaas@google.com] > On Tue, Jun 09, 2015 at 05:44:36AM -0400, Allen Hubbe wrote: > > Add module parameters for the addresses to be used in b2b topology. > > What does "b2b" mean? In this case it means back-to-back, referring to the topology connecting the ntb devices. There are two ntb devices connected to each other, secondary side to secondary side, or back-to-back. The terminology is not entirely unambiguous, unfortunately. In the glossary of an Intel doc, it is defined as above, as back-to-back. PLX doesn't ever use the term b2b that I could find, but it uses the term back-to-back instead referring to the two internal endpoints of one ntb device. ????{.n?+???????+%?????ݶ??w??{.n?+????{??G?????{ay?ʇڙ?,j??f???h?????????z_??(?階?ݢj"???m??????G????????????&???~???iO???z??v?^?m???? ????????I?