Re: [RFC PATCH] RDMA/cma: Remove netlink interface of CMA statistics

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

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On Mon, Nov 13, 2017 at 12:24:32PM -0700, Jason Gunthorpe wrote:
> On Mon, Nov 13, 2017 at 04:40:24PM +0200, Leon Romanovsky wrote:
> > From: Leon Romanovsky <leonro-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> >
> > CMA statistics were exposed to users through netlink interface long time
> > ago, but it wasn't exposed using netlink extensibility approach. The
> > current implementation was based on struct and not attributes.
> >
> > Let's remove it, before anyone is actually start to use it and prevents us
> > to write it properly.
>
> You should describe why you think it is safe to remove a uAPI from the
> kernel in the commit message.. When was it introduced? Why was a uAPI
> added with no users??

I didn't want to invest time before I actually see that it is possible.
The purpose of this RFC is to hear feedback and see if anyone cares enough
about that code.

The code was introduced a long time ago [1] as an attempt to provide
netstat-like information. It had simple demo application, which didn't
work for me, before I started to refactor ib_netlink.

Also latest fixes from Parav in the actual callback implementation support
my feelings that the kernel part is broken too.

Is it enough to proceed with the submission of actual patch?

Thanks

>
> Jason

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