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

Jason Gunthorpe
2015-07-14T19:57:00Z

On Tue, Jul 14, 2015 at 12:45:12PM -0700, 'Christoph Hellwig' wrote:

> How does IB_DEVICE_LOCAL_DMA_LKEY (and ->local_dma_lkey) play into
> this? Seems like that should be the preferred option if supported.

Very good question.

> Interestingly enough various iWarp driver seem to support this option,
> what's the story behind that? The (to me surprising) conclusion on
> the list was that iWarp would always need a memory regireations that

Only for the RDMA READ lkey. All the other verbs are the same as IB,
and should use a local access all physical MR lkey.

Jason
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