linux-kernel - RE: [PATCH v2 10/17] IB/Verbs: Adopt management helpers for IB helpers

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Message-ID: <008401d0716f$bc41c5c0$34c55140$@opengridcomputing.com>
Date:	Tue, 7 Apr 2015 15:16:30 -0500
From:	"Steve Wise" <swise@...ngridcomputing.com>
To:	"'Jason Gunthorpe'" <jgunthorpe@...idianresearch.com>,
	"'Michael Wang'" <yun.wang@...fitbricks.com>
Cc:	"'Roland Dreier'" <roland@...nel.org>,
	"'Sean Hefty'" <sean.hefty@...el.com>,
	<linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-nfs@...r.kernel.org>, <netdev@...r.kernel.org>,
	"'Hal Rosenstock'" <hal.rosenstock@...il.com>,
	"'Tom Tucker'" <tom@...ngridcomputing.com>,
	"'Hoang-Nam Nguyen'" <hnguyen@...ibm.com>,
	"'Christoph Raisch'" <raisch@...ibm.com>,
	"'Mike Marciniszyn'" <infinipath@...el.com>,
	"'Eli Cohen'" <eli@...lanox.com>,
	"'Faisal Latif'" <faisal.latif@...el.com>,
	"'Upinder Malhi'" <umalhi@...co.com>,
	"'Trond Myklebust'" <trond.myklebust@...marydata.com>,
	"'J. Bruce Fields'" <bfields@...ldses.org>,
	"'David S. Miller'" <davem@...emloft.net>,
	"'Ira Weiny'" <ira.weiny@...el.com>,
	"'PJ Waskiewicz'" <pj.waskiewicz@...idfire.com>,
	"'Tatyana Nikolova'" <Tatyana.E.Nikolova@...el.com>,
	"'Or Gerlitz'" <ogerlitz@...lanox.com>,
	"'Jack Morgenstein'" <jackm@....mellanox.co.il>,
	"'Haggai Eran'" <haggaie@...lanox.com>,
	"'Ilya Nelkenbaum'" <ilyan@...lanox.com>,
	"'Yann Droneaud'" <ydroneaud@...eya.com>,
	"'Bart Van Assche'" <bvanassche@....org>,
	"'Shachar Raindel'" <raindel@...lanox.com>,
	"'Sagi Grimberg'" <sagig@...lanox.com>,
	"'Devesh Sharma'" <devesh.sharma@...lex.com>,
	"'Matan Barak'" <matanb@...lanox.com>,
	"'Moni Shoua'" <monis@...lanox.com>,
	"'Jiri Kosina'" <jkosina@...e.cz>,
	"'Selvin Xavier'" <selvin.xavier@...lex.com>,
	"'Mitesh Ahuja'" <mitesh.ahuja@...lex.com>,
	"'Li RongQing'" <roy.qing.li@...il.com>,
	"'Rasmus Villemoes'" <linux@...musvillemoes.dk>,
	"'Alex Estrin'" <alex.estrin@...el.com>,
	"'Doug Ledford'" <dledford@...hat.com>,
	"'Eric Dumazet'" <edumazet@...gle.com>,
	"'Erez Shitrit'" <erezsh@...lanox.com>,
	"'Tom Gundersen'" <teg@...m.no>,
	"'Chuck Lever'" <chuck.lever@...cle.com>
Subject: RE: [PATCH v2 10/17] IB/Verbs: Adopt management helpers for IB helpers



> -----Original Message-----
> From: Jason Gunthorpe [mailto:jgunthorpe@...idianresearch.com]
> Sent: Tuesday, April 07, 2015 3:13 PM
> To: Michael Wang
> Cc: Roland Dreier; Sean Hefty; linux-rdma@...r.kernel.org; linux-kernel@...r.kernel.org; linux-nfs@...r.kernel.org;
> netdev@...r.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.

Steve.



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