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

From: Jason Gunthorpe
Date: Tue Dec 15 2015 - 12:30:42 EST

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. 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.

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