On 07/07/2015 17:17, Steve Wise wrote: > > >> -----Original Message----- >> From: linux-nfs-owner@xxxxxxxxxxxxxxx [mailto:linux-nfs-owner@xxxxxxxxxxxxxxx] On Behalf Of Haggai Eran >> Sent: Monday, July 06, 2015 2:09 AM >> To: Steve Wise; dledford@xxxxxxxxxx >> Cc: sagig@xxxxxxxxxxxx; ogerlitz@xxxxxxxxxxxx; roid@xxxxxxxxxxxx; linux-rdma@xxxxxxxxxxxxxxx; eli@xxxxxxxxxxxx; target- >> devel@xxxxxxxxxxxxxxx; linux-nfs@xxxxxxxxxxxxxxx; trond.myklebust@xxxxxxxxxxxxxxx; bfields@xxxxxxxxxxxx >> Subject: Re: [PATCH V3 1/5] RDMA/core: Transport-independent access flags >> >> On 06/07/2015 02:22, Steve Wise wrote: >>> +int rdma_device_access_flags(struct ib_pd *pd, int roles, int attrs) >>> +{ >>> + int access_flags = attrs; >>> + >>> + if (roles & RDMA_MRR_RECV) >>> + access_flags |= IB_ACCESS_LOCAL_WRITE; >>> + >>> + if (roles & RDMA_MRR_WRITE_DEST) >>> + access_flags |= IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_WRITE; >>> + >>> + if (roles & RDMA_MRR_READ_DEST) { >>> + access_flags |= IB_ACCESS_LOCAL_WRITE; >>> + if (rdma_protocol_iwarp(pd->device, >>> + rdma_start_port(pd->device))) >>> + access_flags |= IB_ACCESS_REMOTE_WRITE; >>> + } >>> + >>> + if (roles & RDMA_MRR_READ_SOURCE) >>> + access_flags |= IB_ACCESS_REMOTE_READ; >>> + >>> + if (roles & RDMA_MRR_ATOMIC_DEST) >>> + access_flags |= IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_ATOMIC; >> >> I think you need LOCAL_WRITE for ATOMIC_SOURCE in order to receive the >> results of the atomic operation. >> > > Where/how are the results returned? In a recv completion? If so, then that MR would need RDMA_MRR_RECV, not RDMA_MRR_ATOMIC_SOURCE. They are returned in the scatter list provided in ib_send_wr.sg_list, similarly to how RDMA read results are returned. -- 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
