Roland Dreier wrote:
> I'm a little perplexed by the fast reg WR definition. The context is
> that I'm using the Fast Reg verb to map the local memory that is the
> data source for an RDMA_WRITE.
>
> The WR format, however, only takes an rkey. How does this all work
> when you're using fast reg to map local memory? Does the WR really
> need the mr pointer, or both the lkey and rkey? The IBTA spec seems to
> indicate that it needs more information about the MR than just the
> rkey.
On Mellanox, L_Key and R_Key are always the same,
Also true for iWARP.
so it doesn't really
matter. I think in general the idea would be that the L_Key you have
gets updatedd with any "consumer key" changes you make in the WR but
otherwise works the same.
Fair enough. Use the mr->lkey value in the SGE for subsequent DTO.
the WR processing better be able to find the
MR by R_Key so I think it's OK.
It just seems a little weird to be supplying the R_Key when you're
mapping local memory.
I'll look at the IB spec though.
The spec refers to a bunch of verification on the L_Key. Obviously, if
the L_Key and R_Key are the same the distinction is moot.
- R.
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