[ofa-general] RE: Querying paths on fabrics that don't have Ipoib

[Mike Heinz]

Thanks, Sean. 


--
Michael Heinz
Principal Engineer, Qlogic Corporation
King of Prussia, Pennsylvania

-----Original Message-----
From: Sean Hefty [mailto:sean.hefty at intel.com] 
Sent: Tuesday, December 02, 2008 3:39 PM
To: Mike Heinz; general at lists.openfabrics.org
Subject: RE: Querying paths on fabrics that don't have Ipoib

>Is there an API for either the ibcm or the rdmacm that lets me resolve 
>to a path without IPOIB? I know I can accomplish this by doing sa 
>queries by hand, but part of this effort is to evaluate the effect of 
>the caching features in ib_sa, and those seem to work only with the cm 
>modules and ipoib.

There is not a supported API for what you are trying to do.

There is a very old libibsa library and supporting kernel module that I
created for the labs a couple of years ago that may help, but I do not
know how much effort it would take to get it running again.  Plus, it
would need to be modified to support PR queries.  If interested, see my
rdma-dev.git (user_sa
branch) and libibsa.git trees.

You could also try modifying the rdma_cm code, so that
rdma_resolve_addr() takes a DGID directly to avoid IP to GID mappings.
The GID could be passed as an IPv6 address, with some sort of indication
that it really is a GID (different address family, for example).

- Sean