> -----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? -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
