linux-kernel - RE: [EXTERNAL] Re: [PATCH v5 1/1] misc: mrvl-cn10k-dpi: add Octeon CN10K DPI administrative driver

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Date: Thu, 25 Apr 2024 13:36:05 +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>,
        Jerin Jacob <jerinj@...vell.com>
Subject: RE: [EXTERNAL] Re: [PATCH v5 1/1] misc: mrvl-cn10k-dpi: add Octeon
 CN10K DPI administrative driver

> 
> > -----Original Message-----
> > From: Greg KH <gregkh@...uxfoundation.org>
> > Sent: Friday, April 12, 2024 5:57 PM
> > To: Vamsi Krishna Attunuru <vattunuru@...vell.com>
> > Cc: arnd@...db.de; linux-kernel@...r.kernel.org
> > Subject: [EXTERNAL] Re: [PATCH v5 1/1] misc: mrvl-cn10k-dpi: add
> > Octeon CN10K DPI administrative driver
> >
> > Prioritize security for external emails: Confirm sender and content
> > safety before clicking links or opening attachments
> >
> > ----------------------------------------------------------------------
> > On Fri, Apr 12, 2024 at 05:10:05AM -0700, Vamsi Attunuru wrote:
> > > Adds a misc 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 provisions 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.
> >
> > No pointer to the userspace code that uses this?  Why not?  How are we
> > supposed to be able to review this?
> 
Hi Greg, please check the below files for userspace code that interact with this kernel driver.
driver/roc_dpi.c provides the mailbox interface to communicate with this kernel driver.
application/main.c is the DPI DMA application which uses this misc driver to configure
the device with required mps, mrrs, fifo_mask parameters.

https://github.com/VamsiKrishnaA99/dpi-dma/blob/main/driver/roc_dpi.c 
https://github.com/VamsiKrishnaA99/dpi-dma/blob/main/application/main.c