[ewg] Re: pkey change handling patch

[Moni Levy]

On 4/26/07, Roland Dreier <rdreier at cisco.com> wrote:
>  > > Let's do it over query_pkey/query_port for now.
>  > > Long term providers will just optimize these I think.
>  >
>  > How ? Caching at device driver level ?
>
> Yes... for the most part, it should be much easier to do within the
> driver.  For example mthca, mlx4 and ipath at least know exactly when
> the P_Key table is being changed and can just snoop the operation
> without needing to worry about deferring things to a workqueue, etc.
>
> ehca seems to have a hypercall that returns the whole P_Key table in
> one go.
>
> I think it would be fine to change the interface to something like
>
>         query_pkey(struct ib_device *dev, u8 port, u16 start_index,
>                    u16 num_pkeys, u16 *pkey)
>
> that returns a block of P_Keys in one go, but I don't see it as that critical.

That's exactly what I meant, and yes I agree it's not urgent.

>