Re: [PATCH for-next 03/10] IB/core: Support accessing SA in virtualized environment

On Tue, Mar 01, 2016 at 09:07:42PM +0200, Eli Cohen wrote:

On Tue, Mar 01, 2016 at 11:32:56AM -0700, Jason Gunthorpe wrote:

quoted

How does this interact with the existing SRIOV stuff? It is already
very annoying that mlx5 is incompatible with the old scheme. Is the
proposal to shift all IB to this new scheme, or still keep mlx4/mlx5 with
different approaches?

Now we have proper interfaces so we can use these interfaces to
implement the same functionality in mlx4 which is there but accessible
in a different manner.

quoted

We can't just have the kernel become incompatible with existing
SMs. Eg opensm only supports the old scheme last I looked.

You need a SM which support virtualizaion to have virtualization
supported but if you don't you can still work with physical functions
in the same way you did before so we don't break anything, we just
adding new functionality.

I mean opensm supports the GUID Alias scheme for virtualization, this
new virtualization scheme is not compatible, and we shouldn't have the
kernel drop support for existing working SMs, by, eg, replacing the
mlx4 guid alias scheme with this new scheme.

I'm guessing a user controlled switch is going to be necessary here to
pick GUID alias or port port virtualization.

Jason
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