netdev - Re: [PATCH v3 2/4] bus: fsl-mc: add restool userspace support

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Date:   Thu, 5 Apr 2018 14:09:47 +0000
From:   Laurentiu Tudor <laurentiu.tudor@....com>
To:     gregkh <gregkh@...uxfoundation.org>
CC:     Andrew Lunn <andrew@...n.ch>, Stuart Yoder <stuyoder@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ruxandra Ioana Ciocoi Radulescu <ruxandra.radulescu@....com>,
        Razvan Stefanescu <razvan.stefanescu@....com>,
        Roy Pledge <roy.pledge@....com>,
        Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH v3 2/4] bus: fsl-mc: add restool userspace support

Hi Greg,

On 04/05/2018 03:30 PM, gregkh wrote:
> On Thu, Apr 05, 2018 at 10:30:01AM +0000, Laurentiu Tudor wrote:
>> Hello,
>>
>> My 2c below.
>>
>> On 04/04/2018 03:42 PM, Andrew Lunn wrote:
>>>> I hear you.  It is more complicated this way...having all these individual
>>>> objects vs just a single "bundle" of them that represents a NIC.  But, that's
>>>> the way the DPAA2 hardware is, and we're implementing kernel support for
>>>> the hardware as it is.
>>>
>>> Hi Stuart
>>>
>>> I see we are not making any progress here.
>>>
>>> So what i suggest is you post the kernel code and configuration tool
>>> concept to netdev for a full review. You want reviews from David
>>> Miller, Jiri Pirko, Jakub Kicinski, David Ahern, etc.
>>>
>>
>> I think that the discussion steered too much towards networking related
>> topics, while this ioctl doesn't have much to do with networking.
>> It's just an ioctl for our mc-bus bus driver that is used to manage the
>> devices on this bus through userspace tools.
>> In addition, I'd drop any mention of our reference user space app
>> (restool) to emphasize that this ioctl is not added just for a
>> particular user space app. I think Stuart also mentioned this.
>
> I'm not going to take a "generic device configuration ioctl" patch
> unless it is documented to all exactly what it does, and why it is
> there.

The ioctl() is just a simple pass-through interface to the firmware.
It passes commands to the firmware and returns the response back to the 
userspace. Thus the ABI used by the firmware applies for this ioctl() 
and it is documented in detail here:

https://www.nxp.com/docs/en/user-guide/DPAA2_UM.pdf

---
Best Regards, Laurentiu