> Quoting Tang, Changqing <[EMAIL PROTECTED]>: > Subject: RE: RFCv2: SRC API > > > > > I have another question, when using SRQ, or SRC+SRQ, when a > > completion > > > is returned by ibv_poll_cq(), is there an easy way to find > > who sent > > > this message to me ? 'struct ibv_wc' does not say much about the > > > message source rank. The only field is 'src_qp', but I can not find > > > any document about how to use it. > > > > There's also qp_num. > > 1. src_qp is 'uint32_t', what does it mean ?
Natuarally high 8 bit are 0 - there's no type in C that is 24 bit wide. > Translate 'src_qp/qp_num' > to source info is not easy, right ? source info is a rank? You'll have to build a table and to a lookup, yes. > 2. for SRC+SRQ, these two fields are not useful, because if a rank is > not the rank who made connection (j3,j4, not j2, as we discussed), it > has no information about the send QP. You can supply the send QPN information when you exchange SRQ number info. > > > > > Is there any way to return some kind of "source context" ? > > > > > > Or do you think this is application's responsibility to figure out > > > source rank from the message itself ? I hope the source rank can be > > > identified before parsing the message. > > > > > > Thanks. > > > > How about using send with immediate, and sticking the rank in > > the immediate data? > > I always think 'send-with-immediate' is slower than 'send', am I wrong ? Donnu. 32 bit immediate seems unlikely to have much of an overhead. > Anyway this is the best way so far. -- MST _______________________________________________ general mailing list general@lists.openfabrics.org http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general