[ofa-general] [PATCH RFC v3 1/2] RDMA/Core: MEM_MGT_EXTENSIONS support

[Steve Wise]

Roland Dreier wrote:
>  > - device-specific alloc/free of physical buffer lists for use in fast
>  > register work requests.  This allows devices to allocate this memory as
>  > needed (like via dma_alloc_coherent).
> 
> I'm looking at how one would implement the MM extensions for mlx4, and
> it turns out that in addition to needing to allocate these fastreg page
> lists in coherent memory, mlx4 is even going to need to write to the
> memory (basically set the lsb of each address for internal device
> reasons).  So I think we just need to update the documentation of the
> interface so that not only does the page list belong to the device
> driver between posting the fastreg work request and completing the
> request, but also the device driver is allowed to change the page list
> as part of the work request processing.
> 
> I don't see any real reason why this would cause problems for consumers;
> does this seem OK to other people?

Tom,

Does this affect how you plan to implement NFSRDMA MEM_MGT_EXTENTIONS 
support?