netdev - Re: [RFC v1 for accelerated IPoIB 05/25] IB/ipoib: Support ipoib acceleration options callbacks

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Date:   Tue, 14 Mar 2017 09:44:19 -0600
From:   Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:     "Vishwanathapura, Niranjana" <niranjana.vishwanathapura@...el.com>
Cc:     Erez Shitrit <erezsh@...lanox.com>, dledford@...hat.com,
        linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
        valex@...lanox.com, leonro@...lanox.com, saedm@...lanox.com,
        erezsh@....mellanox.co.il
Subject: Re: [RFC v1 for accelerated IPoIB 05/25] IB/ipoib: Support ipoib
 acceleration options callbacks

On Mon, Mar 13, 2017 at 11:35:38PM -0700, Vishwanathapura, Niranjana wrote:

> This will break ipoib on hfi1 as hfi1 will define alloc_rdma_netdev for
> OPA_VNIC type. We should probably look for a dedicated return type
> (-ENODEV?) to determine of the driver supports specified rdma netdev type.
> Or use a ib device attribute to suggest driver support ipoib rdma netdev.

I think I prefer call and detect ENOSUPP or whatever than yet another
flag.

Jason