linux-kernel - RE: [PATCH v3 09/18] NTB: Add parameters for Intel SNB B2B addresses

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Date:	Tue, 9 Jun 2015 16:59:57 +0000
From:	"Hubbe, Allen" <Allen.Hubbe@....com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	"linux-ntb@...glegroups.com" <linux-ntb@...glegroups.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Jon Mason <jdmason@...zu.us>, Dave Jiang <dave.jiang@...el.com>
Subject: RE: [PATCH v3 09/18] NTB: Add parameters for Intel SNB B2B addresses

From: Bjorn Helgaas [mailto:bhelgaas@...gle.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.