[ofw] [ND 0/7] ND implementation over winverbs

[Fab Tillier]

> -----Original Message-----
> From: ofw-bounces at lists.openfabrics.org [mailto:ofw-
> bounces at lists.openfabrics.org] On Behalf Of Sean Hefty
> Sent: Monday, April 06, 2009 10:17 AM
> To: ofw at lists.openfabrics.org
> Subject: [ofw] [ND 0/7] ND implementation over winverbs
>
> This is a very quick start at implementing ND over winverbs.  Compile
> tested only and imcomplete - maybe 65% of the APIs are coded.

Excellent!

> Probably the only real issue is
> working around the lack of memory window support, but I've thought of a
> couple ways to handle that.

If you can store the RKey in the memory registration object, you can have 'bind' and 'invalidate' issue a zero-byte RDMA so that they generate a CQE.  Bind would then return the pre-existing RKey.  Note that the MR handle for 64-bit apps can be the LKey/RKey pair.  You only need extra logic for 32-bit apps.

This doesn't provide any of the value of memory windows, but it does get things to be functional until true MW support is provided in the HW drivers.

-Fab