linux-kernel - RE: [PATCH v2 11/17] IB/Verbs: Reform link_layer_show() and ib_uverbs_query

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Date:	Tue, 7 Apr 2015 13:56:47 -0500
From:	"Steve Wise" <swise@...ngridcomputing.com>
To:	"'Hefty, Sean'" <sean.hefty@...el.com>,
	"'Michael Wang'" <yun.wang@...fitbricks.com>,
	"'Roland Dreier'" <roland@...nel.org>,
	<linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-nfs@...r.kernel.org>, <netdev@...r.kernel.org>
Cc:	"'Hal Rosenstock'" <hal.rosenstock@...il.com>,
	"'Tom Tucker'" <tom@...ngridcomputing.com>,
	"'Hoang-Nam Nguyen'" <hnguyen@...ibm.com>,
	"'Christoph Raisch'" <raisch@...ibm.com>,
	"'infinipath'" <infinipath@...el.com>,
	"'Eli Cohen'" <eli@...lanox.com>,
	"'Latif, Faisal'" <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>,
	"'Weiny, Ira'" <ira.weiny@...el.com>,
	"'PJ Waskiewicz'" <pj.waskiewicz@...idfire.com>,
	"'Nikolova, Tatyana E'" <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>,
	"'Estrin, Alex'" <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 11/17] IB/Verbs: Reform link_layer_show() and ib_uverbs_query_port()

> 
> > diff --git a/drivers/infiniband/core/sysfs.c
> > b/drivers/infiniband/core/sysfs.c
> > index cbd0383..aa53e40 100644
> > --- a/drivers/infiniband/core/sysfs.c
> > +++ b/drivers/infiniband/core/sysfs.c
> > @@ -248,14 +248,10 @@ static ssize_t phys_state_show(struct ib_port *p,
> > struct port_attribute *unused,
> >  static ssize_t link_layer_show(struct ib_port *p, struct port_attribute
> > *unused,
> >  			       char *buf)
> >  {
> > -	switch (rdma_port_get_link_layer(p->ibdev, p->port_num)) {
> > -	case IB_LINK_LAYER_INFINIBAND:
> > +	if (rdma_transport_ib(p->ibdev, p->port_num))
> >  		return sprintf(buf, "%s\n", "InfiniBand");
> > -	case IB_LINK_LAYER_ETHERNET:
> > +	else
> >  		return sprintf(buf, "%s\n", "Ethernet");
> > -	default:
> > -		return sprintf(buf, "%s\n", "Unknown");
> > -	}
> >  }
> >
> >  static PORT_ATTR_RO(state);
> > diff --git a/drivers/infiniband/core/uverbs_cmd.c
> > b/drivers/infiniband/core/uverbs_cmd.c
> > index a9f0489..3eb6eb5 100644
> > --- a/drivers/infiniband/core/uverbs_cmd.c
> > +++ b/drivers/infiniband/core/uverbs_cmd.c
> > @@ -515,8 +515,10 @@ ssize_t ib_uverbs_query_port(struct ib_uverbs_file
> > *file,
> >  	resp.active_width    = attr.active_width;
> >  	resp.active_speed    = attr.active_speed;
> >  	resp.phys_state      = attr.phys_state;
> > -	resp.link_layer      = rdma_port_get_link_layer(file->device-
> > >ib_dev,
> > -							cmd.port_num);
> > +	resp.link_layer      = rdma_transport_ib(file->device->ib_dev,
> > +							cmd.port_num) ?
> > +			       IB_LINK_LAYER_INFINIBAND :
> > +			       IB_LINK_LAYER_ETHERNET;
> >
> >  	if (copy_to_user((void __user *) (unsigned long) cmd.response,
> >  			 &resp, sizeof resp))
> 
> Both of the above check the transport in order to determine the link layer.
> 
> These values are exposed to user space.  Does anyone know what link layer iWarp returns to user space?

Ethernet:

t4:~ # ibv_devinfo -d cxgb4_0|grep link_layer
                        link_layer:             Ethernet
                        link_layer:             Ethernet

Steve.

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