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

[Hal Rosenstock]

On Wed, 2007-02-07 at 17:49, Jason Gunthorpe wrote:
> On Wed, Feb 07, 2007 at 02:40:51PM -0800, Sean Hefty wrote:
> > Are you referring to the SLID in the CM REQ?  If so, I've been looking at 
> > this issue as well.  I simply cannot think of any way to come up with this 
> > LID, and my current solution is to punt this problem over to the passive 
> > side, which could use the SLID of the router that the CM REQ is received 
> > from.  If not, well, then I just rambled more than usual.
> 
> Yes, this is the problem.
> 
> The active side clearly cannot learn what the SLID of the passive
> side's router should be.
> 
> We don't want to have the routers snoop and alter CM GMPs.
> 
> The passive side cannot use information from the LRH to get the router
> LID since the LRH may not be reversible.
> 
> The only option seems to be to have the passive side do a path record
> query on a SGID in the CM REQ...
> 
> This is a spec problem unfortunately.

Yes and I would expect that this would be changed.

-- Hal

> 
> Jason
> 
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