[openib-general] APM support in openib stack

[Michael Krause]

At 11:24 AM 10/13/2006, Sean Hefty wrote:
> >3. in req_handler() we follow the same steps as we have done without APM..
> >   i.e. create qpairs, change qp state to RTR and then  send REP.
> >
> >however, when trying to change state to RTR usinb ib_modify_qp() I get
> >an error (-22).
> >
> >two info: same code will work if I pass alt_path as NULL or change the
> >alt_path as primary path.
> >
> >I must be missing something here, I assume this basic APM feature works
> >in RHEL4 update 4 distribtion
> >of openib stack.
>
>I added code to the ib_cm to handle APM, but haven't ever tested it myself.  I
>believe others have used it successfully though.
>
>What differences are there between the primary and alternate paths?  I.e. are
>just the LIDs different, or are other values also different?

The spec allows a full address vector to be specified not just LID.

Mike