Re: [PATCH 10/11] IB: only keep a single key in struct ib_mr

On Tue, Dec 22, 2015 at 03:50:12PM +0200, Sagi Grimberg wrote:

This is why I said that the problem here is not the ULPs. But if a new
HW comes along with distinction between rkeys and lkeys it will have a
problem. For example a HW allocates two different keys, rkey and lkey.
And, it chooses to fail SEND from a rkey, or incoming READ/WRITE to a
lkey. How can such a device be supported with an API that allows a
single key per MR?

The ULP decides if this MR is going to be used as a lkey or rkey
by passing IB_REG_LKEY or IB_REG_RKEY.  The HCA driver will then
fill mr->key by the lkey or rkey based on that and everything will
work fine.
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