[openib-general] Problem is routing CM REQ

[Sean Hefty]

> An endnode look up should be to find the address 
> vector to the remote.   A look up may return multiple vectors.   The 
> SLID would correspond to each local subnet router port that acts as a 
> first-hop destination to the remote subnet.    I don't see why the 
> router protocol would not simply enable all paths on the local subnet to 
> a given remote subnet be acquired.  All of the work is kept local to the 
> SA / SM in the source subnet when determining a remote path to take.   
> Why is there any need to define more than just this?

For an RC QP, we need at least two sets of LIDs.  In the simplest case, we need 
the SLID/router DLID for the local subnet, and the router SLID/DLID for the 
remote subnet.  The problem is in obtaining the SLID/DLID for the remote subnet.

- Sean