netdev - Re: [RFC 02/10] IB/hfi-vnic: Virtual Network Interface Controller (VNIC) Bus driver

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Date:   Thu, 24 Nov 2016 18:13:50 -0800
From:   "Vishwanathapura, Niranjana" <niranjana.vishwanathapura@...el.com>
To:     Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:     "ira.weiny" <ira.weiny@...el.com>,
        Doug Ledford <dledford@...hat.com>, linux-rdma@...r.kernel.org,
        netdev@...r.kernel.org,
        Dennis Dalessandro <dennis.dalessandro@...el.com>
Subject: Re: [RFC 02/10] IB/hfi-vnic: Virtual Network Interface Controller
 (VNIC) Bus driver

On Thu, Nov 24, 2016 at 09:15:45AM -0700, Jason Gunthorpe wrote:
>On Wed, Nov 23, 2016 at 04:08:25PM -0800, Vishwanathapura, Niranjana wrote:
>
>> In order to pass the hfi function pointers to the hfi_vnic ULP, I can,
>> a) Have hfi_vnic ULP define an interface API for hfi1 driver to call to
>> register its callback (as you pointed). Unfortunately there will be a module
>> dependency here.
>> Or,
>
>That is probably backwards
>
>> b) Add a new member ‘struct vnic_ops’ either to the ib_device structure or
>> ib_port_immutable structure. As it is hfi1 specific, only hfi1 driver will
>> set it. No module dependency here.
>
>You can add a hfi1_get_vnic_ops(struct ib_device *) and implement it
>in your module..
>

In order to be truely device independent the hfi_vnic ULP should not depend on 
a device exported symbol. Instead device should register its functions with the 
ULP. Hence the approaches a) and b).

Niranjana

>Jason