Re: [PATCH rdma-rc 1/2] IB/core: Only enforce security for InfiniBand

[Leon Romanovsky <leon@kernel.org>]

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On Tue, Nov 21, 2017 at 11:57:44AM -0700, Jason Gunthorpe wrote:
> On Tue, Nov 21, 2017 at 01:16:43PM -0500, Don Dutile wrote:
>
> > >>I don't really think it is really too user visible.. Only the device
> > >>and port number change, but only if running in mixed mode.
> > >
> > >Ahh, correct me if I'm wrong, you are proposing to split mlx4_ib devices
> > >to two devices once it is configured in mixed mode, so everyone will
> > >have one port only. Did I understand you correctly?
>
> > Which would require splitting resources that are shared now? other
> > splitting issue(s)?
>
> A change like this would be almost transparent to most users. The cx3
> card in mixed mode will look like a mlx5 card does: two single port
> RDMA devices.
>
> I think only a minimal amount of stuff is actually shared between
> ports, and as cx5 already demonstrates there isn't really a notable
> downside to having two kernel RDMA devices.

CX4+ cards have completely different HW architecture in opposite to CX3,
and mlx5 implementation doesn't mean that your suggestion is doable for
mlx4. It worth to check it.

Thanks

>
> Jason

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