[openib-general] question regarding GRH flag in ib_ah_attr

[Hal Rosenstock]

On Wed, 2006-05-10 at 19:44, Roland Dreier wrote:
>     Sean> Does anyone know how the user determines if the grh flag
>     Sean> should be set in the ib_ah_attr when allocating an ib_ah?
>     Sean> Do they do this by examining the GIDs in a path record?
> 
> Good question.  It's always needed for multicast, of course.  For
> unicast, I guess one could look at whether the subnet prefixes of the
> SGID and DGID are the same, but I'm not sure that's sufficient -- a
> router could conceivably sit between two subnets with the same subnet
> prefix.

Huh ? In this case, aren't the subnet prefixes are required to be
different ?

-- Hal

> Perhaps some of the Obsidian guys could comment?
> 
>  - R.
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