[openib-general] Re: [RFC] userspace CM/verbs QP

[Sean Hefty]

Roland Dreier wrote:
>  1. Don't worry about checking.  There's nothing too evil a CM user
>     can do with a QP beyond getting another QP to connect to it, since
>     the CM user can't modify a QP unless it legitimately owns it.  And
>     an evil user can always guess the QPN instead of the QP handle anyway.
> 
>  2. Change the CM API so that it just takes the QPN, QP type, SRQ
>     status and device directly rather than reading it out of the QP.
>     This lets the userspace CM just get the info from userspace
>     without needing to look at the QP at all.  Of course it does raise
>     the issue of how userspace should specify the device.
> 
>  3. Merge the userspace CM into userspace verbs support so they use
>     the same context.  Ugh.
> 
> Personally I would lean slightly towards #2, since it feels to me like
> even the kernel CM API would be cleaner that way.  However I don't
> have a good answer for how userspace should specify which device to
> use.

Which of these options is being used?  It seems like option #2 would 
work as long as there's a way to locate a device based on a GID.

- Sean