linux-kernel - Re: [PATCH v2 01/14] Documentation: PCI: Add specification for the *PCI NTB* function device

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Date:   Fri, 12 Jun 2020 11:00:53 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Matthew Wilcox <willy@...radead.org>
CC:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Arnd Bergmann <arnd@...db.de>, Jon Mason <jdmason@...zu.us>,
        Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <allenbh@...il.com>,
        Tom Joseph <tjoseph@...ence.com>,
        Rob Herring <robh@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-pci@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-ntb@...glegroups.com>
Subject: Re: [PATCH v2 01/14] Documentation: PCI: Add specification for the
 *PCI NTB* function device

Hi Matthew,

On 6/11/2020 8:43 PM, Matthew Wilcox wrote:
> On Thu, Jun 11, 2020 at 06:35:12PM +0530, Kishon Vijay Abraham I wrote:
>> +++ b/Documentation/PCI/endpoint/pci-ntb-function.rst
>> @@ -0,0 +1,344 @@
>> +.. SPDX-License-Identifier: GPL-2.0
>> +
>> +=================
>> +PCI NTB Function
>> +=================
>> +
>> +:Author: Kishon Vijay Abraham I <kishon@...com>
>> +
>> +PCI NTB Function allows two different systems (or hosts) to communicate
>> +with each other by configurig the endpoint instances in such a way that
>> +transactions from one system is routed to the other system.
> 
> At no point in this document do you expand "NTB" into Non-Transparent
> Bridge.  The above paragraph probably also needs to say something like "By
> making each host appear as a device to the other host".  Although maybe
> that's not entirely accurate?  It's been a few years since I last played
> with NTBs.
> 
> So how about the following opening paragraph:
> 
> PCI Non Transparent Bridges (NTB) allow two host systems to communicate
> with each other by exposing each host as a device to the other host.
> NTBs typically support the ability to generate interrupts on the remote
> machine, expose memory ranges as BARs and perform DMA.  They also support
> scratchpads which are areas of memory within the NTB that are accessible
> from both machines.
> 
> ... feel free to fix that up if my memory is out of date or corrupted.

I think that's accurate. I'll wait for review comments on the rest of the
series and I'll fix this one in my next revision.

Thanks
Kishon