> Quoting Sean Hefty <[EMAIL PROTECTED]>: > Subject: Re: [RFC/PATCH] librdmacm: use the ipoib broadcast group qkey > > Or Gerlitz wrote: > > Modify librdmacm use a qkey for its UD IDs/QPs delivered to it by the > > rdma cm kernel code instead the a hard coded RDMA_UD_QKEY. For RDMA_PS_UDP > > ID, the qkey is provided by the kernel in ADDR_RESOLVED and CONNECT_REQUEST > > events and is stored by the library in struct cma_id_private. Later > > the library use the qkey when it is called to create a UD QP. > > Reading the code, the following sequence does not work: rdma_join_multicast > then > rdma_create_qp. The QP does not automatically attach to previously joined > multicast groups on creation. (This is a problem with the existing code.) > The > reverse sequence (create then join) does work. I'm adding the ipoib support > to > the librdmacm now, but we will still need a separate patch to fix attaching > to > joined multicast groups when the QP is created.
Maybe just ask user to always call rdma_join_multicast after rdma_create_qp? Joins are now properly reference counted, so it shouldn't be a problem to repeat this any number of times. Right? -- MST _______________________________________________ openib-general mailing list openib-general@openib.org http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
