From: Leon Romanovsky <leon@kernel.org>
To: Dennis Dalessandro <dennis.dalessandro@intel.com>
Cc: Doug Ledford <dledford@redhat.com>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"Saleem, Shiraz" <shiraz.saleem@intel.com>,
"Kirsher, Jeffrey T" <jeffrey.t.kirsher@intel.com>,
"jgg@mellanox.com" <jgg@mellanox.com>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>
Subject: Re: [RFC 20/20] RDMA/i40iw: Mark i40iw as deprecated
Date: Thu, 3 Oct 2019 11:23:33 +0300 [thread overview]
Message-ID: <20191003082333.GL5855@unreal> (raw)
In-Reply-To: <64752160-e8cc-5dcd-d0f9-f26f81057324@intel.com>
On Wed, Oct 02, 2019 at 05:15:45PM -0400, Dennis Dalessandro wrote:
> On 9/28/2019 1:55 AM, Leon Romanovsky wrote:
> > On Fri, Sep 27, 2019 at 04:17:15PM -0400, Doug Ledford wrote:
> > > On Thu, 2019-09-26 at 21:55 +0200, gregkh@linuxfoundation.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@intel.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?
>
> I doubt too many especially the latest bleeding edge upstream kernel. That
> could be interesting, but I don't think it's the reality.
>
> Distro kernels could certainly still keep the old driver, and that makes a
> lot of sense.
Also, they are invited to run their regression suite to verify
stability and report any arising problems to upstream/vendor.
Thanks
>
> -Denny
>
next prev parent reply other threads:[~2019-10-03 8:23 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-26 16:44 [RFC 00/20] Intel RDMA/IDC Driver series Jeff Kirsher
2019-09-26 16:45 ` [RFC 01/20] ice: Initialize and register multi-function device to provide RDMA Jeff Kirsher
2019-09-26 18:05 ` Greg KH
2019-09-26 23:39 ` Nguyen, Anthony L
2019-09-27 5:13 ` gregkh
2019-09-27 18:03 ` Ertman, David M
2019-10-23 17:44 ` Jason Gunthorpe
2019-10-23 17:55 ` Ertman, David M
2019-10-23 18:01 ` Jason Gunthorpe
2019-10-24 18:56 ` gregkh
2019-10-24 19:10 ` Jason Gunthorpe
2019-10-24 22:25 ` Ertman, David M
2019-10-25 1:30 ` gregkh
2019-10-25 22:27 ` Ertman, David M
2019-10-26 18:53 ` gregkh
2019-10-31 7:42 ` Tomas Winkler
2019-09-26 16:45 ` [RFC 02/20] ice: Implement peer communications Jeff Kirsher
2019-09-26 16:45 ` [RFC 03/20] i40e: Register multi-function device to provide RDMA Jeff Kirsher
2019-09-26 16:45 ` [RFC 04/20] RDMA/irdma: Add driver framework definitions Jeff Kirsher
2019-09-26 16:55 ` Jason Gunthorpe
2019-09-26 18:02 ` gregkh
2019-09-26 18:04 ` Jason Gunthorpe
2019-09-26 18:10 ` Saleem, Shiraz
2019-09-26 17:30 ` Leon Romanovsky
2019-09-26 19:51 ` Saleem, Shiraz
2019-10-04 20:12 ` Jeff Kirsher
2019-10-04 23:45 ` Jason Gunthorpe
2019-10-05 0:46 ` Jeff Kirsher
2019-10-05 6:28 ` Leon Romanovsky
2019-10-05 7:08 ` gregkh
2019-10-05 22:01 ` Jason Gunthorpe
2019-09-26 16:45 ` [RFC 05/20] RDMA/irdma: Implement device initialization definitions Jeff Kirsher
2019-09-26 16:45 ` [RFC 06/20] RDMA/irdma: Implement HW Admin Queue OPs Jeff Kirsher
2019-09-26 16:45 ` [RFC 07/20] RDMA/irdma: Add HMC backing store setup functions Jeff Kirsher
2019-09-26 16:45 ` [RFC 08/20] RDMA/irdma: Add privileged UDA queue implementation Jeff Kirsher
2019-09-26 16:45 ` [RFC 09/20] RDMA/irdma: Add QoS definitions Jeff Kirsher
2019-09-26 16:45 ` [RFC 10/20] RDMA/irdma: Add connection manager Jeff Kirsher
2019-09-26 16:45 ` [RFC 11/20] RDMA/irdma: Add PBLE resource manager Jeff Kirsher
2019-09-26 16:45 ` [RFC 12/20] RDMA/irdma: Implement device supported verb APIs Jeff Kirsher
2019-09-26 17:37 ` Leon Romanovsky
2019-09-26 17:40 ` Jason Gunthorpe
2019-09-26 19:50 ` Saleem, Shiraz
2019-09-26 19:49 ` Saleem, Shiraz
2019-09-27 4:50 ` Leon Romanovsky
2019-09-27 14:28 ` Saleem, Shiraz
2019-09-28 6:00 ` Leon Romanovsky
2019-09-30 14:14 ` Saleem, Shiraz
2019-09-26 16:45 ` [RFC 13/20] RDMA/irdma: Add RoCEv2 UD OP support Jeff Kirsher
2019-09-26 16:45 ` [RFC 14/20] RDMA/irdma: Add user/kernel shared libraries Jeff Kirsher
2019-09-26 16:45 ` [RFC 15/20] RDMA/irdma: Add miscellaneous utility definitions Jeff Kirsher
2019-09-26 17:49 ` Leon Romanovsky
2019-09-26 19:49 ` Saleem, Shiraz
2019-09-27 4:46 ` Leon Romanovsky
2019-09-27 14:28 ` Saleem, Shiraz
2019-09-27 18:23 ` gregkh
2019-09-28 5:53 ` Leon Romanovsky
2019-09-26 16:45 ` [RFC 16/20] RDMA/irdma: Add dynamic tracing for CM Jeff Kirsher
2019-09-26 16:45 ` [RFC 17/20] RDMA/irdma: Add ABI definitions Jeff Kirsher
2019-09-26 16:45 ` [RFC 18/20] RDMA/irdma: Update MAINTAINERS file Jeff Kirsher
2019-09-26 16:45 ` [RFC 19/20] RDMA/irdma: Add Kconfig and Makefile Jeff Kirsher
2019-09-26 16:45 ` [RFC 20/20] RDMA/i40iw: Mark i40iw as deprecated Jeff Kirsher
2019-09-26 17:40 ` Leon Romanovsky
2019-09-26 19:49 ` Saleem, Shiraz
2019-09-26 19:55 ` gregkh
2019-09-27 14:28 ` Saleem, Shiraz
2019-09-27 20:18 ` Doug Ledford
2019-09-27 20:17 ` Doug Ledford
2019-09-28 5:55 ` Leon Romanovsky
2019-10-02 21:15 ` Dennis Dalessandro
2019-10-03 8:23 ` Leon Romanovsky [this message]
2019-09-29 9:28 ` [RFC 00/20] Intel RDMA/IDC Driver series Or Gerlitz
2019-09-30 15:46 ` Jeff Kirsher
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