[openib-general] Unusable QP's on CM established connections from gen2 client to gen1 server.

[Bub Thomas]

I don't have a svn repository.
I'm living on OFED release will this work on the version in OFED-1.1?
Thomas

> -----Original Message-----
> From: Sasha Khapyorsky [mailto:sashak at voltaire.com]
> Sent: Monday, November 13, 2006 9:12 PM
> To: Hal Rosenstock; Bub Thomas
> Cc: Sean Hefty; Erez Cohen; openib-general at openib.org
> Subject: Re: [openib-general] Unusable QP's on CM established
connections
> from gen2 client to gen1 server.
> 
> On 19:49 Mon 13 Nov     , Hal Rosenstock wrote:
> > There may be an OpenSM bug with setting hop limit in the path record
> response. I'm looking at it now.
> 
> Looks like it is - OpenSM returns the same hop_limit value as was in
the
> request.
> 
> Bub, could you try the patch below?
> 
> Thanks,
> Sasha
> 
> 
> diff --git a/osm/opensm/osm_sa_path_record.c
> b/osm/opensm/osm_sa_path_record.c
> index 560e385..72a89d0 100644
> --- a/osm/opensm/osm_sa_path_record.c
> +++ b/osm/opensm/osm_sa_path_record.c
> @@ -709,6 +710,8 @@ __osm_pr_rcv_build_pr(
>    p_pr->dlid = cl_hton16( dest_lid_ho );
>    p_pr->slid = cl_hton16( src_lid_ho );
> 
> +  p_pr->hop_flow_raw &= cl_hton32(1<<31);
> +
>    p_pr->pkey = p_parms->pkey;
>    p_pr->sl = cl_hton16(p_parms->sl);
>    p_pr->mtu = (uint8_t)(p_parms->mtu | 0x80);
> 
> 
> >
> > -- Hal
> >
> > ________________________________
> >
> > From: openib-general-bounces at openib.org on behalf of Sean Hefty
> > Sent: Mon 11/13/2006 11:26 AM
> > To: Bub Thomas
> > Cc: Erez Cohen; openib-general at openib.org
> > Subject: Re: [openib-general] Unusable QP's on CM established
> connections from gen2 client to gen1 server.
> >
> >
> >
> > Bub Thomas wrote:
> > > Setting the hop_limit from 64 down to 0 or 1 solved the problem.
:-)
> > > Don't ask me where I got that hop_limit from, it must have been an
> > > example I found somewhere.
> > > Can you explain why that hop_limit/is_global makes a difference in
> > > communication between gen1 and gen2? Does the counterpart need to
have
> > > the same hop_limit?
> >
> > The gen2 stack uses a hop_limit > 0 to indicate that global routing
is
> being
> > used.  If the hop_limit is > 0, then the global routing information
must
> be valid.
> >
> > > The path record values I use are queried from the OSM using a
> > > SERVICE_RECORD query followed by a path record query.
> > > I'm not using any alternate path record values, is this critical?
> >
> > Everything is supposed to work with the path records returned from
the
> SM.  I
> > was wondering if you were querying for the path record, modifying
the
> returned
> > value, or creating a path record yourself.
> >
> > >     path_record.packet_life_time = 0;
> >
> > I would set this higher (maybe between 12-20, with: 18 = 1 second,
19 =
> 2
> > seconds, 20 = 4 seconds, etc.)
> >
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