linux-kernel - RE: [EXT] Re: [PATCH v2 1/1] misc: mrvl-cn10k-dpi: add Octeon CN10K dpi driver

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Date: Mon, 19 Feb 2024 05:03:38 +0000
From: Vamsi Krishna Attunuru <vattunuru@...vell.com>
To: Greg KH <gregkh@...uxfoundation.org>
CC: "arnd@...db.de" <arnd@...db.de>,
        "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [EXT] Re: [PATCH v2 1/1] misc: mrvl-cn10k-dpi: add Octeon CN10K
 dpi driver



> -----Original Message-----
> From: Greg KH <gregkh@...uxfoundation.org>
> Sent: Saturday, February 17, 2024 1:44 PM
> To: Vamsi Krishna Attunuru <vattunuru@...vell.com>
> Cc: arnd@...db.de; linux-kernel@...r.kernel.org
> Subject: [EXT] Re: [PATCH v2 1/1] misc: mrvl-cn10k-dpi: add Octeon CN10K
> dpi driver
> 
> External Email
> 
> ----------------------------------------------------------------------
> On Fri, Feb 16, 2024 at 02:32:25AM -0800, Vamsi Attunuru wrote:
> > Adds a driver for Marvell CN10K DPI(DMA Engine) device's physical
> > function which initializes DPI DMA hardware's global configuration and
> > enables hardware mailbox channels between physical function (PF) and
> > it's virtual functions (VF). VF device drivers (User space drivers)
> > use this hw mailbox to communicate any required device configuration
> > on it's respective VF device. Accordingly, this DPI PF driver provision the VF
> device resources.
> >
> > At the hardware level, the DPI physical function (PF) acts as a
> > management interface to setup the VF device resources, VF devices are
> > only provisioned to handle or control the actual DMA Engine's data transfer
> capabilities.
> >
> > Signed-off-by: Vamsi Attunuru <vattunuru@...vell.com>
> > ---
> >
> > Changes V1 -> V2:
> > - Fixed return values and busy-wait loops
> > - Merged .h file into .c file
> > - Fixed directory structure
> > - Removed module params
> > - Registered the device as misc device
> 
> Why register as a misc device if you don't actually use it at all?  That feels
> pointless and extra code and confusion for everyone as you have created a
> device node in the system that will just fail all operations made on it.
> 
> confused,
> 

Module params are removed in V2, planning to use device node to pass the device configuration tuning parameters and other ops, can you please also share other v2 review comments, I will plan to address it in V3.

> greg k-h