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
mrs.
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
registration.
I think that sounds reasonable. I can add that for chelsio.
Steve.
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