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

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Date:   Wed, 15 Mar 2017 08:47:51 +0200
From:   Leon Romanovsky <leonro@...lanox.com>
To:     Jason Gunthorpe <jgunthorpe@...idianresearch.com>
CC:     Erez Shitrit <erezsh@....mellanox.co.il>,
        "Vishwanathapura, Niranjana" <niranjana.vishwanathapura@...el.com>,
        Erez Shitrit <erezsh@...lanox.com>,
        Doug Ledford <dledford@...hat.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        <netdev@...r.kernel.org>, <valex@...lanox.com>,
        <saedm@...lanox.com>
Subject: Re: [RFC v1 for accelerated IPoIB 05/25] IB/ipoib: Support ipoib
 acceleration options callbacks

On Tue, Mar 14, 2017 at 10:00:21AM -0600, Jason Gunthorpe wrote:
> On Tue, Mar 14, 2017 at 04:42:55PM +0200, Erez Shitrit wrote:
> > >> +       if (!hca->alloc_rdma_netdev)
> > >> +               dev = ipoib_create_netdev_default(hca, name,
> > >> ipoib_setup_common);
> > >> +       else
> > >> +               dev = hca->alloc_rdma_netdev(hca, port, RDMA_NETDEV_IPOIB,
> > >> +                                            name, NET_NAME_UNKNOWN,
> > >> +                                            ipoib_setup_common);
> > >> +       if (!dev) {
> > >> +               kfree(priv);
> > >> +               return NULL;
> > >> +       }
> > >
> > >
> > > 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.
> >
> > sorry, I don't understand that, we are in ipoib driver, so the type is
> > RDMA_NETDEV_IPOIB, if hfi wants to implement it should use the same
> > flag, and to use OPA_VNIC for vnic.
>
> He means it should look like this:
>
>  if (hca->alloc_rdma_netdev)
>      dev = hca->alloc_rdma_netdev(hca, port, RDMA_NETDEV_IPOIB,
>                                             name, NET_NAME_UNKNOWN,
>                                             ipoib_setup_common);
>
>  if (IS_ERR(dev) && PTR_ERR(dev) != ENOTSUP)
>       goto out;
>
>  dev = ipoib_create_netdev_default(hca, name, ipoib_setup_common);
>  if (IS_ERR(dev))
>       goto out;
>
>  WARN_ON(dev == NULL);
>
>   [...]
>
> out:
>       return PTR_ERR(dev);
>
> And I'm confused why 'ipoib_create_netdev_default' doesn't need the
> same function signature as hca->alloc_rdma_netdev

And now, I'm confused.
In your's proposal, the "dev" will be overwritten, in Erez's proposal,
"dev" will be one of two: defaults or device specific.

>
> Both drivers should implement hca->alloc_rdma_netdev to return ENOTSUP
> if RDMA_NETDEV is not supported.

Did you mean "if RDMA_NETDEV of specific type is not supported"?

Thanks

>
> Jason

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