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

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Date:   Tue, 27 Mar 2018 06:21:41 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Steve Wise <swise@...ngridcomputing.com>,
        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 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.

Thanks

>
> Jason

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