Re: [PATCH V3 1/5] RDMA/core: Transport-independent access flags

Jason Gunthorpe
2015-07-23T23:53:10Z

On Thu, Jul 23, 2015 at 11:30:08PM +0000, Hefty, Sean wrote:

> I don't see where usnic, ipath, qib, or opa technically need an lkey
> at all.

The lkey is possibly useful if someone wants to do single op transfers
larger than the S/G limit of the SQE. I haven't noticed any ULPs doing
that..

qib family may not technically need a lkey, but those drivers are the
only modern drivers not to support IB_DEVICE_LOCAL_DMA_LKEY.

Jason
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