linux-kernel - RE: [PATCH v3 25/28] IB/Verbs: Use management helper cap_af

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Date:	Thu, 16 Apr 2015 15:09:21 +0000
From:	"Hefty, Sean" <sean.hefty@...el.com>
To:	Hal Rosenstock <hal@....mellanox.co.il>,
	Or Gerlitz <gerlitz.or@...il.com>
CC:	Michael Wang <yun.wang@...fitbricks.com>,
	Roland Dreier <roland@...nel.org>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Tom Tucker <tom@...ngridcomputing.com>,
	Steve Wise <swise@...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>,
	Jack Morgenstein <jackm@....mellanox.co.il>,
	"Or Gerlitz" <ogerlitz@...lanox.com>,
	Haggai Eran <haggaie@...lanox.com>,
	"Weiny, Ira" <ira.weiny@...el.com>, Tom Talpey <tom@...pey.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Doug Ledford <dledford@...hat.com>
Subject: RE: [PATCH v3 25/28] IB/Verbs: Use management helper cap_af_ib()

> >> diff --git a/drivers/infiniband/core/cma.c
> b/drivers/infiniband/core/cma.c
> >> index 65e41f4..7f5815d 100644
> >> --- a/drivers/infiniband/core/cma.c
> >> +++ b/drivers/infiniband/core/cma.c
> >> @@ -470,7 +470,7 @@ static int cma_resolve_ib_dev(struct
> rdma_id_private *id_priv)
> >>
> >>         list_for_each_entry(cur_dev, &dev_list, list) {
> >>                 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
> >> -                       if (!rdma_ib_or_iboe(cur_dev->device, p))
> >> +                       if (!cap_af_ib(cur_dev->device, p))
> >>                                 continue;
> >>
> >>                         if (ib_find_cached_pkey(cur_dev->device, p,
> pkey, &index))
> >> diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
> >> index 29ddd14..dfe33f3 100644
> >> --- a/include/rdma/ib_verbs.h
> >> +++ b/include/rdma/ib_verbs.h
> >> @@ -1879,6 +1879,21 @@ static inline int cap_ipoib(struct ib_device
> *device, u8 port_num)
> >>  }
> >>
> >>  /**
> >> + * cap_af_ib - Check if the port of device has the capability
> >> + * Native Infiniband Address.
> >> + *
> >> + * @device: Device to be checked
> >> + * @port_num: Port number of the device
> >> + *
> >> + * Return 0 when port of the device don't support
> >> + * Native Infiniband Address.
> >> + */
> >> +static inline int cap_af_ib(struct ib_device *device, u8 port_num)
> >> +{
> >> +       return rdma_ib_or_iboe(device, port_num);
> >> +}
> >
> > Sean, can you please put a precise writeup what does it take to
> > support AF_IB... I am a bit
> > confused here and wasn't sure if this can be supported with RoCE.
> 
> I think this means IB GID addressing is checked (Native Infiniband
> Address) and not AF_IB (which is socket address/protocol family like
> INET and INET6).
> 
> I think this naming is confusing and maybe cap_ib_gid is better ?

I need to trace back through the code to see where this is used, but I thought the check was determining if an address conveyed using sockaddr_ib applied to the port.  Sockaddr_ib was intended to target IB-classic specifically.  It should apply to RoCE/IBoE as well.  I don't think it applies to RoCEv2/IBoUDP without a translation.