On Tue, Apr 07, 2015 at 03:16:30PM -0500, Steve Wise wrote:
>
>
> > -----Original Message-----
> > From: Jason Gunthorpe [mailto:jguntho...@obsidianresearch.com]
> > Sent: Tuesday, April 07, 2015 3:13 PM
> > To: Michael Wang
> > Cc: Roland Dreier; Sean Hefty; linux-r...@vger.kernel.org;
> > linux-kernel@vger.kernel.org; linux-...@vger.kernel.org;
> > net...@vger.kernel.org; Hal Rosenstock; Tom Tucker; Steve Wise; Hoang-Nam
> > Nguyen; Christoph Raisch; Mike Marciniszyn; Eli Cohen;
> > Faisal Latif; Upinder Malhi; Trond Myklebust; J. Bruce Fields; David S.
> > Miller; Ira Weiny; PJ Waskiewicz; Tatyana Nikolova; Or
> Gerlitz; Jack
> > Morgenstein; Haggai Eran; Ilya Nelkenbaum; Yann Droneaud; Bart Van Assche;
> > Shachar Raindel; Sagi Grimberg; Devesh Sharma; Matan
> > Barak; Moni Shoua; Jiri Kosina; Selvin Xavier; Mitesh Ahuja; Li RongQing;
> > Rasmus Villemoes; Alex Estrin; Doug Ledford; Eric
> Dumazet; Erez
> > Shitrit; Tom Gundersen; Chuck Lever
> > Subject: Re: [PATCH v2 10/17] IB/Verbs: Adopt management helpers for IB
> > helpers
> >
> > On Tue, Apr 07, 2015 at 02:35:22PM +0200, Michael Wang wrote:
> > > index f704254..4e61104 100644
> > > +++ b/drivers/infiniband/core/sa_query.c
> > > @@ -540,7 +540,7 @@ int ib_init_ah_from_path(struct ib_device *device, u8
> > > port_num,
> > > ah_attr->port_num = port_num;
> > > ah_attr->static_rate = rec->rate;
> > >
> > > - force_grh = rdma_port_get_link_layer(device, port_num) ==
> > > IB_LINK_LAYER_ETHERNET;
> > > + force_grh = !rdma_transport_ib(device, port_num);
> >
> > Maybe these tests should be called cap_mandatory_grh - but I'm not
> > really sure how iWarp uses the GRH fields in the AH...
> >
>
> iWARP runs on top of TCP...this SA code is all IB-specific. The reason it
> was checking for ETHERNET, I think, is for RoCE. So
> this change is totally incorrect, I think, because RoCE is an IB transport,
> but it runs on ETHERNET.
But RoCE does not have an SA?
Looks like ib_init_ah_from_path was overloaded to handle non-standard "path
records".
It seems like the correct functionality would be to use ib_init_ah_from_path()
for true SA PathRecords and have another call iboe_init_ah() wrap
ib_init_ah_from_path() when RoCE address information is needed in the AH.
For Michaels patches I think
force_grh = rdma_device_is_iboe(...)
is the logic we need here.
Ira
>
> Steve.
>
>
>
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