netdev - Re: [RFC 01/20] ice: Initialize and register multi-function device to provide RDMA

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Date:   Thu, 26 Sep 2019 20:05:56 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:     dledford@...hat.com, jgg@...lanox.com,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        Dave Ertman <david.m.ertman@...el.com>
Subject: Re: [RFC 01/20] ice: Initialize and register multi-function device
 to provide RDMA

On Thu, Sep 26, 2019 at 09:45:00AM -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.

Huh?  How do you "know" where it is then?  Isn't is usually assigned to
a PCI device?

> Thus the ice driver needs to provide access to the RDMA hardware block
> via a virtual bus; utilize a multi-function device to provide this access.
> 
> This patch initializes the driver to support RDMA as well as creates
> and registers a multi-function 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.
> 
> We refer to the interaction of this platform device as Inter-Driver
> Communication (IDC); where the platform device is referred to as the peer
> device and the platform driver is referred to as the peer driver.

Again, no platform devices, unless it REALLY IS a platform device (i.e.
you are using device tree or platform data to find it.)  Is that what
you are doing here?

confused,

greg k-h