Re: [PATCH RESEND] infiniband:core:Add needed error path in cm_init_av_by_path

[ira.weiny]

On Tue, Dec 15, 2015 at 10:30:22AM -0700, Jason Gunthorpe wrote:
> On Tue, Dec 15, 2015 at 05:38:34PM +0100, Michael Wang wrote:
> > The hop_limit is only suggest that the package allowed to be
> > routed, not have to, correct?
> 
> If the hop limit is >= 2 (?) then the GRH is mandatory.

Yes >= 2.

"Setting this value to 0 or 1 will ensure that the packet 
will not be forwarded beyond the local subnet."

	-- IBTA 8.3.6 Hop Limit

Ira

> The
> SM will return this information in the PathRecord if it determines a
> GRH is required. The whole stack follows this protocol.
> 
> The GRH is optional for in-subnet communications.
> 
> Jason
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