netdev - RE: [PATCH v2 iproute2-next 3/6] rdma: Add CM

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Message-ID: <026701d3c5e7$838c65d0$8aa53170$@opengridcomputing.com>
Date:   Tue, 27 Mar 2018 11:20:25 -0500
From:   "Steve Wise" <swise@...ngridcomputing.com>
To:     "'Leon Romanovsky'" <leon@...nel.org>
Cc:     "'Jason Gunthorpe'" <jgg@...pe.ca>,
        "'David Ahern'" <dsahern@...il.com>, <stephen@...workplumber.org>,
        <netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>
Subject: RE: [PATCH v2 iproute2-next 3/6] rdma: Add CM_ID resource tracking information

> On Tue, Mar 27, 2018 at 10:45:30AM -0500, Steve Wise wrote:
> >
> > >
> > > On Tue, Mar 27, 2018 at 06:15:44PM +0300, Leon Romanovsky wrote:
> > > > On Tue, Mar 27, 2018 at 08:44:55AM -0600, Jason Gunthorpe wrote:
> > > > > On Tue, Mar 27, 2018 at 06:21:41AM +0300, Leon Romanovsky
> wrote:
> > > > > > On Mon, Mar 26, 2018 at 04:30:33PM -0600, Jason Gunthorpe
> wrote:
> > > > > > > On Mon, Mar 26, 2018 at 04:34:44PM -0500, Steve Wise wrote:
> > > > > > > >
> > > > > > > > On 3/26/2018 4:15 PM, Jason Gunthorpe wrote:
> > > > > > > > > On Mon, Mar 26, 2018 at 09:30:41AM -0500, Steve Wise
> wrote:
> > > > > > > > >>
> > > > > > > > >> On 3/26/2018 9:17 AM, David Ahern wrote:
> > > > > > > > >>> On 2/27/18 9:07 AM, Steve Wise wrote:
> > > > > > > > >>>> diff --git a/rdma/rdma.h b/rdma/rdma.h
> > > > > > > > >>>> index 5809f70..e55205b 100644
> > > > > > > > >>>> +++ b/rdma/rdma.h
> > > > > > > > >>>> @@ -18,10 +18,12 @@
> > > > > > > > >>>>  #include <libmnl/libmnl.h>
> > > > > > > > >>>>  #include <rdma/rdma_netlink.h>
> > > > > > > > >>>>  #include <time.h>
> > > > > > > > >>>> +#include <net/if_arp.h>
> > > > > > > > >>>>
> > > > > > > > >>>>  #include "list.h"
> > > > > > > > >>>>  #include "utils.h"
> > > > > > > > >>>>  #include "json_writer.h"
> > > > > > > > >>>> +#include <rdma/rdma_cma.h>
> > > > > > > > >>>>
> > > > > > > > >>> did you forget to add rdma_cma.h? I don't see that file
in
> my
> > > repo.
> > > > > > > > >> It is provided by the rdma-core package, upon which rdma
> tool
> > > now
> > > > > > > > >> depends for the rdma_port_space enum.
> > > > > > > > > It is a kernel bug that enum is not in an
include/uapi/rdma
> > > header
> > > > > > > > >
> > > > > > > > > Fix it there and don't try to use rdma-core headers to get
> kernel
> > > ABI.
> > > > > > > > >
> > > > > > > > > Jason
> > > > > > > >
> > > > > > > > I wish you'd commented on this just a little sooner.  I just
> resent
> > > v3
> > > > > > > > of this series... with rdma_cma.h included. :)
> > > > > > > >
> > > > > > > > How about the restrack/nldev code just translates the port
> space
> > > from
> > > > > > > > enum rdma_port_space to a new ABI enum, say
> > > nldev_rdma_port_space, that
> > > > > > > > i add to rdma_netlink.h?  I'd hate to open the can of worms
of
> > > trying to
> > > > > > > > split rdma_cma.h into uabi and no uabi headers. :(
> > > > > > >
> > > > > > > If port space is already part of the ABI there isn't much
reason to
> > > > > > > translate it.
> > > > > > >
> > > > > > > You just need to pick the right header to put it in, since it
is a
> verbs
> > > > > > > define it doesn't belong in the netlink header.
> > > > > >
> > > > > > I completely understand Steve's concerns.
> > > > > >
> > > > > > I tried to do such thing (expose kernel headers) in first
incarnation
> of
> > > > > > rdmatool with attempt to clean IB/core as well to ensure that we
> > > won't expose
> > > > > > anything that is not implemented. It didn't go well.
> > > > >
> > > > > rdma-core is now using the kernel uapi/ headers natively, seems to
> be
> > > > > going OK. What problem did you face?
> > > >
> > > > I didn't agree to move to UAPI defines which are not implemented and
> > > not
> > > > used in the kernel, so I sent small number of patches similar to
those
> [1,
> > > 2].
> > > >
> > > > Those patches were rejected.
> > > >
> > > > So please don't mix Steve's need to use 3 defines with very large
and
> > > > painful task to expose proper UAPIs.
> > >
> > > Steve can just move the 3 defines he needs to the uapi, we are doing
> > > this incrementally..
> > >
> > > rdma_core does not define kernel ABI and it is totally wrong to use
> > > random constants from rdma_cma.h as kernel ABI.
> > >
> >
> > Proposal:
> >
> > Since the cm_id port space is part of the rdma_ucm_create_id struct in
> include/uapi/rdma/rdma_user_cm.h, I'll move the rdma_port_space enum
> there.  And then my iproute2 series will have to add a copy of
> rdma_user_cm.h locally into rdma/include/uapi/rdma, right?
> >
> > Will that work for everyone?
> 
> You need to remove _PS from that structure and from the kernel with
> justification that it is safe to do.
> 
> Thanks

I'm pretty sure port space is needed.  That struct is used to create a user
mode cm_id...