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

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Message-ID: <20180326172707.GQ1877@mtr-leonro.local>
Date:   Mon, 26 Mar 2018 20:27:07 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Steve Wise <swise@...ngridcomputing.com>
Cc:     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 12:13:53PM -0500, Steve Wise wrote:
>
>
> On 3/26/2018 12:06 PM, Leon Romanovsky wrote:
> > On Mon, Mar 26, 2018 at 10:24:25AM -0500, Steve Wise wrote:
> >>
> >> On 3/26/2018 10:08 AM, Leon Romanovsky wrote:
> >>> On Mon, Mar 26, 2018 at 09:55:46AM -0500, Steve Wise wrote:
> >>>> On 3/26/2018 9:44 AM, David Ahern wrote:
> >>>>> On 3/26/18 8:30 AM, 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
> >>>>>>>> --- a/rdma/rdma.h
> >>>>>>>> +++ 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.
> >>>>>>
> >>>>> You need to add a check for the package, and only build rdma if that
> >>>>> package is installed. See check_mnl in configure for an example.
> >>>> Ok, that makes sense.
> >>> IMHO, better solution will be to copy those files to iproute2.
> >> Hey Leon,
> >>
> >> Why is it better in your opinion?  My gut tells me adding rdma_cma.h to
> >> iproute2 means more uabi type syncing.
> > Making rdmatool be dependant on rdma-core will require that distributions
> > will update their specs to install rdma-core as a dependency for every
> > iprotue2 install.
> >
> > The rdma-core dependency makes sense for RDMA users, but doesn't for most of
> > the iproute2 users.
>
> I'm fuzzy on the details of distro packaging, but David's suggestion is
> that rdmatool wouldn't get built if rdma-core isn't present. But
> everything else would.  Just like it does not get built if libmnl is not
> installed.  For pre-built rpms, the rdma-core would have to be present. 
>
> I'm ok pulling it in, I'm just trying to understand. :)
>

Distros supply pre-built packages, for example Fedora's RPM:
https://rpmfind.net/linux/RPM/fedora/27/x86_64/i/iproute-4.12.0-3.fc27.x86_64.html
It requires that libmnl will be installed. Once rdmatool will need
rdma-core, it will pulled in too.

BTW, don't forget to change header's guards (ifdef/defne ..), see
rdma_netlink.h as an example.


> Steve.
>
>
>
>

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