On Mon, Sep 17, 2007 at 11:39:46AM -0700, Sean Hefty wrote: > >I'm with Hal on this - why does this cause a problem? There is no IB > >packet verification check that tests if a GRH is present, only if it > >is presen it must be valid - so how can an extra correctly filled in > >GRH cause anything but degraded performance? > > ib_init_ah_from_path() uses the hop_limit in the path record to > determine if a GRH should be used. It sets the address handle > attributes (used to configure the QP) based on hop_limit > 1. If > hop_limit is set incorrectly in the CM REQ, the path record formed > by the CM based on data carried in the REQ could have invalid GRH > values.
But using this hop limit this was is just a convention we have adopted. There is nothing in IBA that allows the active side to send a REQ with invalid GIDs/etc in any situation. The passive side should always be able to form a correct GRH based on any REQ. Jason _______________________________________________ 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
