netdev - Re: [net-next 1/3] ice: Initialize and register platform device to provide RDMA

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Message-ID: <20190704122950.GA6007@kroah.com>
Date:   Thu, 4 Jul 2019 14:29:50 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jason Gunthorpe <jgg@...lanox.com>
Cc:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "dledford@...hat.com" <dledford@...hat.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "nhorman@...hat.com" <nhorman@...hat.com>,
        "sassmann@...hat.com" <sassmann@...hat.com>,
        "poswald@...e.com" <poswald@...e.com>,
        "mustafa.ismail@...el.com" <mustafa.ismail@...el.com>,
        "shiraz.saleem@...el.com" <shiraz.saleem@...el.com>,
        Dave Ertman <david.m.ertman@...el.com>,
        Andrew Bowers <andrewx.bowers@...el.com>
Subject: Re: [net-next 1/3] ice: Initialize and register platform device to
 provide RDMA

On Thu, Jul 04, 2019 at 12:16:41PM +0000, Jason Gunthorpe wrote:
> On Wed, Jul 03, 2019 at 07:12:50PM -0700, Jeff Kirsher wrote:
> > From: Tony Nguyen <anthony.l.nguyen@...el.com>
> > 
> > The RDMA block does not advertise on the PCI bus or any other bus.
> > Thus the ice driver needs to provide access to the RDMA hardware block
> > via a virtual bus; utilize the platform bus to provide this access.
> > 
> > This patch initializes the driver to support RDMA as well as creates
> > and registers a platform device for the RDMA driver to register to. At
> > this point the driver is fully initialized to register a platform
> > driver, however, can not yet register as the ops have not been
> > implemented.
> 
> I think you need Greg's ack on all this driver stuff - particularly
> that a platform_device is OK.

A platform_device is almost NEVER ok.

Don't abuse it, make a real device on a real bus.  If you don't have a
real bus and just need to create a device to hang other things off of,
then use the virtual one, that's what it is there for.

thanks,

greg k-h