netdev - Re: [RFC 20/20] RDMA/i40iw: Mark i40iw as deprecated

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Message-ID: <20190928055511.GI14368@unreal>
Date:   Sat, 28 Sep 2019 08:55:11 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Doug Ledford <dledford@...hat.com>
Cc:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "Saleem, Shiraz" <shiraz.saleem@...el.com>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
        "jgg@...lanox.com" <jgg@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: Re: [RFC 20/20] RDMA/i40iw: Mark i40iw as deprecated

On Fri, Sep 27, 2019 at 04:17:15PM -0400, Doug Ledford wrote:
> On Thu, 2019-09-26 at 21:55 +0200, gregkh@...uxfoundation.org wrote:
> > On Thu, Sep 26, 2019 at 07:49:44PM +0000, Saleem, Shiraz wrote:
> > > > Subject: Re: [RFC 20/20] RDMA/i40iw: Mark i40iw as deprecated
> > > >
> > > > On Thu, Sep 26, 2019 at 09:45:19AM -0700, Jeff Kirsher wrote:
> > > > > From: Shiraz Saleem <shiraz.saleem@...el.com>
> > > > >
> > > > > Mark i40iw as deprecated/obsolete.
> > > > >
> > > > > irdma is the replacement driver that supports X722.
> > > >
> > > > Can you simply delete old one and add MODULE_ALIAS() in new
> > > > driver?
> > > >
> > >
> > > Yes, but we thought typically driver has to be deprecated for a few
> > > cycles before removing it.
> >
> > If you completely replace it with something that works the same, why
> > keep the old one around at all?
> >
> > Unless you don't trust your new code?  :)
>
> I have yet to see, in over 20 years of kernel experience, a new driver
> replace an old driver and not initially be more buggy and troublesome
> than the old driver.  It takes time and real world usage for the final
> issues to get sorted out.  During that time, the fallback is often
> necessary for those real world users.

How many real users exist in RDMA world who run pure upstream kernel?

Thanks

>
> --
> Doug Ledford <dledford@...hat.com>
>     GPG KeyID: B826A3330E572FDD
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