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

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> -----Original Message-----
> From: linux-rdma-owner@xxxxxxxxxxxxxxx [mailto:linux-rdma-owner@xxxxxxxxxxxxxxx] On Behalf Of Steve Wise
> Sent: Tuesday, July 14, 2015 3:51 PM
> To: 'Jason Gunthorpe'
> Cc: 'Christoph Hellwig'; 'Sagi Grimberg'; 'Steve Wise'; 'Tom Talpey'; 'Doug Ledford'; sagig@xxxxxxxxxxxx; ogerlitz@xxxxxxxxxxxx;
> roid@xxxxxxxxxxxx; linux-rdma@xxxxxxxxxxxxxxx; eli@xxxxxxxxxxxx; target-devel@xxxxxxxxxxxxxxx; linux-nfs@xxxxxxxxxxxxxxx;
> trond.myklebust@xxxxxxxxxxxxxxx; bfields@xxxxxxxxxxxx; 'Oren Duer'
> Subject: RE: [PATCH V3 1/5] RDMA/core: Transport-independent access flags
> 
> 
> 
> > -----Original Message-----
> > From: linux-rdma-owner@xxxxxxxxxxxxxxx [mailto:linux-rdma-owner@xxxxxxxxxxxxxxx] On Behalf Of Jason Gunthorpe
> > Sent: Tuesday, July 14, 2015 3:42 PM
> > To: Steve Wise
> > Cc: 'Christoph Hellwig'; 'Sagi Grimberg'; 'Steve Wise'; 'Tom Talpey'; 'Doug Ledford'; sagig@xxxxxxxxxxxx; ogerlitz@xxxxxxxxxxxx;
> > roid@xxxxxxxxxxxx; linux-rdma@xxxxxxxxxxxxxxx; eli@xxxxxxxxxxxx; target-devel@xxxxxxxxxxxxxxx; linux-nfs@xxxxxxxxxxxxxxx;
> > trond.myklebust@xxxxxxxxxxxxxxx; bfields@xxxxxxxxxxxx; 'Oren Duer'
> > Subject: Re: [PATCH V3 1/5] RDMA/core: Transport-independent access flags
> >
> > On Tue, Jul 14, 2015 at 02:58:23PM -0500, Steve Wise wrote:
> > > The local_dma_lkey can be used in any rdma sge that requires an
> > > lkey.
> >
> > No, this is where iWarp doesn't follow the generic API - a local dma
> > lkey cannot be used with iWarp's RDMA_READ WR lkey. In effect RDMA
> > READ requires an *rkey* (confusingly stuck into the lkey slot) for
> > iWarp. (Right?)
> >
> 
> Right, a local_dma_lkey is not an rkey, and iwarp requires the rkey for the read destination MR.  Further that rkey needs
> REMOTE_WRITE.
>

BTW: What use is an IB rkey with no REMOTE_ flags set?  Can it be used somehow differently than the associated lkey?


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