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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