[openib-general] [PATCH] IPOIB: Use a GRH when appropriate for unicast packets

[Sean Hefty]

> We don't want to have the routers snoop and alter CM GMPs.

agreed

> The passive side cannot use information from the LRH to get the router
> LID since the LRH may not be reversible.

argh... I was interpreting symmetric paths at the network layer (SGID to DGID) 
and applying it at the link layer as well.  (See the last couple of sentences on 
page 222 of the spec.)

> The only option seems to be to have the passive side do a path record
> query on a SGID in the CM REQ...

I've thought of that as well, and this is what Yaron mentioned in his OFA DevCon 
slides as well.  I'd just like to avoid adding even more complexity to the ib_cm 
state management if at all possible.

> This is a spec problem unfortunately.

aye...

- Sean