Re: dedicated list for rdma userspace programming

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

[-- Attachment #1: Type: text/plain, Size: 1968 bytes --]

On Mon, Apr 24, 2017 at 02:58:57PM +0300, Vasiliy Tolstov wrote:
> 2017-04-24 14:47 GMT+03:00 Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>:
> > On Mon, Apr 24, 2017 at 02:07:14PM +0300, Vasiliy Tolstov wrote:
> >> 2017-04-24 13:42 GMT+03:00 Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>:
> >> > There are number of char devices exported by infiniband subsystem
> >> > (/dev/infiniband/*) and the communication is performed with read/write
> >> > interfaces to uverbs file [1].
> >> >
> >> > Right now, we are in process of migration from these interfaces to ioctl
> >> > based, see Matan's latest RFC [2].
> >>
> >>
> >> Where i can find tree with commits from [2] ?
> >
> > https://github.com/matanb10/linux tag: abi-devel-latest
>
> Thanks!
>
> >
> >> 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).

>
> >> 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


> --
> Vasiliy Tolstov,
> e-mail: v.tolstov-+9FY0jupvH6HXe+LvDLADg@public.gmane.org
> --
> To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]