[ofa-general] [PATCH RFC] RDMA/cxgb3: Fixes for zero-stag.
swise at opengridcomputing.com
Mon Jun 30 08:07:38 PDT 2008
Or Gerlitz wrote:
> Steve Wise wrote:
>> Sort of. It is not exactly a dma_mr. dma_mrs allow remote IO. The
>> zero-stag is an iWARP verbs concept. zero-stag can be used by kernel
>> users as the lkey in any SGE that requires only local access rights.
>> If the lkey is zero, then the rnic interprets the addr field in the
>> SGE as a bus address.
> I see.
> Assuming we want to narrow the differences between RDMA transports
> from the ULP point of view and that IB does not support this verb -
> I'd like to see if its possible to have zero stags implemented as dma
> How about enhancing the iWARP HW drivers implementation of get_dma_mr
> to switch on the access flags provided by the caller, and if no remote
> access it needed, just return zero stag for mr.lkey without doing any
I think that sounds reasonable. I can add that for chelsio.
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