Re: dedicated list for rdma userspace programming

[Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

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On Mon, Apr 24, 2017 at 03:45:26PM +0300, Vasiliy Tolstov wrote:
> 2017-04-24 15:34 GMT+03:00 Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>:
> >> >> And how much work needs to be done to get this work upstream? (1
> >> >> month, 6 months, years...) ?
> >> >
> >> > At least one kernel cycle, and after transition read/write will be
> >> > obsolete and will be dropped.
> >> >
> >>
> >> So 4.12-4.13 ?
> >
> > 4.12 is almost closed. We are in rc8 now and merge window will be next
> > week, so it will be 4.13-4.14 (optimistic).
> >
>
> Fine. So older interfaces will be deprecated and removed in next few
> cycles. I think i can now create something that used old api and do
> transition later (i'm use fedora)

Yes, conversion should be possible, Matan and Jason invest a lot of time
and effort to be sure that conversion will be as minimal as possible.

>
> >>
> >> >> If i want to try working with uverbs without C librarary, where i can
> >> >> find some info about format of messages reader and writed to uverbs
> >> >> device?
> >> >
> >> > Did you see Documentation/infiniband/user_verbs.txt?
> >>
> >>
> >> https://www.kernel.org/doc/Documentation/infiniband/user_verbs.txt as
> >> i see this nothing says about format of data writed/readed...
> >>
> >
> > See in include/uapi/rdma/ib_user_verbs.h, User fills struct from that
> > file, and kernel performs copy_from_user to extract the data. That's
> > all.
>
> Thanks! If i need to establish communication between two nodes and
> send/recv data (and get notification that data can be readed) does
> this file  enough to do that?

Yes, if performance is not critical to you.
Otherwise, the best solution will be to take a look on implementation
of data transfer (various post_send functions) in rdma-core library.

> (i'm plan to try create plain go binding, now only for fun, create
> generator for this C struct/enums to plain go types)


>
>
> --
> Vasiliy Tolstov,
> e-mail: v.tolstov-+9FY0jupvH6HXe+LvDLADg@public.gmane.org

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