Re: [PATCH rdma-next 02/15] net/mlx5: Set software owner ID during init HCA

[Jason Gunthorpe <jgg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>]

On Wed, Dec 27, 2017 at 09:27:20AM -0600, Daniel Jurgens wrote:
> On 12/24/2017 4:00 PM, Or Gerlitz wrote:
> > On Sun, Dec 24, 2017 at 2:57 PM, Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
> >> From: Daniel Jurgens <danielj-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> >>
> >> Generate a unique 128bit identifier for each host and pass that value to
> >> firmware in the INIT_HCA command if it reports the sw_owner_id
> >> capo ability. This value is used by FW to determine if functions are in
> >> use by the same host.
> > "capo ability"?
> >
> > did you want to say the same driver instance? b/c multiple instances
> > of the driver can run on a host

> No, we want to set the same SW owner ID set for all devices for that
> host. Not per driver instance.

This commit message is confusing, can you explain it better please?

I'm guessing the owner_id is used to match individual port's PCI
functions?

So, any 'host' that can see multiple PCI function and share ports
should set the same ID?

What happens when a driver is detached? Eg I rebind the PCI function
to VFIO. Does something reset the ID?

Not entirely sure why this is being done at all, shouldn't the PCI
functions be rather un-ambiguous?

Jason
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