linux-kernel - Re: [PATCH RESEND] infiniband:core:Add needed error path in cm_init_av_by

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Message-ID: <20151216065222.GA27524@phlsvsds.ph.intel.com>
Date:	Wed, 16 Dec 2015 01:52:22 -0500
From:	"ira.weiny" <ira.weiny@...el.com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:	Michael Wang <yun.wang@...fitbricks.com>,
	Nicholas Krause <xerofoify@...il.com>, dledford@...hat.com,
	sean.hefty@...el.com, hal.rosenstock@...il.com,
	haggaie@...lanox.com, matanb@...lanox.com, doront@...lanox.com,
	david.ahern@...cle.com, erezsh@...lanox.com,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] infiniband:core:Add needed error path in cm_init_av_by_path

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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