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From: Jason Gunthorpe <jgg@ziepe.ca>
To: Dennis Dalessandro <dennis.dalessandro@intel.com>
Cc: Leon Romanovsky <leon@kernel.org>,
	Max Gurtovoy <maxg@mellanox.com>,
	bvanassche@acm.org, linux-rdma@vger.kernel.org,
	dledford@redhat.com, sagi@grimberg.me, israelr@mellanox.com,
	shlomin@mellanox.com, "Marciniszyn,
	Mike" <mike.marciniszyn@intel.com>
Subject: Re: [PATCH 0/8 v1] Remove FMR support from RDMA drivers
Date: Sat, 23 May 2020 19:08:21 -0300
Message-ID: <20200523220821.GB744@ziepe.ca> (raw)
In-Reply-To: <5563b8da-faf3-1af5-33d0-fe5a6d7291a1@intel.com>

On Tue, May 19, 2020 at 10:37:07AM -0400, Dennis Dalessandro wrote:
> On 5/19/2020 10:30 AM, Jason Gunthorpe wrote:
> > On Tue, May 19, 2020 at 10:26:37AM -0400, Dennis Dalessandro wrote:
> > > On 5/19/2020 10:19 AM, Leon Romanovsky wrote:
> > > > On Tue, May 19, 2020 at 10:53:52AM -0300, Jason Gunthorpe wrote:
> > > > > On Tue, May 19, 2020 at 09:43:14AM -0400, Dennis Dalessandro wrote:
> > > > > > On 5/18/2020 2:10 PM, Jason Gunthorpe wrote:
> > > > > > > On Mon, May 18, 2020 at 11:20:04AM -0400, Dennis Dalessandro wrote:
> > > > > > > > On 5/14/2020 8:02 AM, Max Gurtovoy wrote:
> > > > > > > > > This series removes the support for FMR mode to register memory. This ancient
> > > > > > > > > mode is unsafe and not maintained/tested in the last few years. It also doesn't
> > > > > > > > > have any reasonable advantage over other memory registration methods such as
> > > > > > > > > FRWR (that is implemented in all the recent RDMA adapters). This series should
> > > > > > > > > be reviewed and approved by the maintainer of the effected drivers and I
> > > > > > > > > suggest to test it as well.
> > > > > > > > > 
> > > > > > > > > The tests that I made for this series (fio benchmarks and fio verify data):
> > > > > > > > > 1. iSER initiator on ConnectX-4
> > > > > > > > > 2. iSER initiator on ConnectX-3
> > > > > > > > > 3. SRP initiator on ConnectX-4 (loopback to SRP target)
> > > > > > > > > 4. SRP initiator on ConnectX-3
> > > > > > > > > 
> > > > > > > > > Not tested:
> > > > > > > > > 1. RDS
> > > > > > > > > 2. mthca
> > > > > > > > > 3. rdmavt
> > > > > > > > 
> > > > > > > > This will effectively kill qib which uses rdmavt. It's gonna have to be a
> > > > > > > > NAK from me.
> > > > > > > 
> > > > > > > Are you objecting the SRP and iSER changes too?
> > > > > > 
> > > > > > No, just want to keep basic verbs support at least. NFS already dropped,
> > > > > > similarly we are ok with dropping it from SRP/iSER as a next step.
> > > > > 
> > > > > So you see a major user in RDS for qib?
> > > > 
> > > > Didn't we agree to drop it from RDS too?
> > > > 
> > > 
> > > Just basic verbs application support is enough for qib I think. I don't see
> > > any major use of RDS.
> > 
> > Well, once the in-kernel users of an API are gone that API will be
> > purged. This is standard kernel policy.
> > 
> > So you can't NAK this series on the grounds you want to keep an API
> > without users, presumably for out of tree modules...
> > 
> 
> Maybe I need to look at this again. I thought it would kill off user access
> as well. We don't need any kernel ULPs.

Did you make a conclusion? Seems like everyone else is in agreement
here, if Max resends a v2 I'm inclined to take it unless RDS objects.

I did not think FMR or FRWR were available from userspace at all.

Jason

  reply index

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-14 12:02 Max Gurtovoy
2020-05-14 12:02 ` [PATCH 1/8] RDMA/mlx4: remove FMR support for memory registration Max Gurtovoy
2020-05-14 12:02 ` [PATCH 2/8] RDMA/rds: " Max Gurtovoy
2020-05-14 12:03 ` [PATCH 3/8] RDMA/mthca: " Max Gurtovoy
2020-05-14 12:03 ` [PATCH 4/8] RDMA/rdmavt: remove FMR " Max Gurtovoy
2020-05-14 12:03 ` [PATCH 5/8] RDMA/iser: Remove support for " Max Gurtovoy
2020-05-14 12:03 ` [PATCH 6/8] RDMA/srp: remove " Max Gurtovoy
2020-05-14 14:02   ` Bart Van Assche
2020-05-14 12:03 ` [PATCH 7/8] RDMA/core: remove FMR pool API Max Gurtovoy
2020-05-14 12:03 ` [PATCH 8/8] RDMA/core: remove FMR device ops Max Gurtovoy
2020-05-14 15:13 ` [PATCH 0/8 v1] Remove FMR support from RDMA drivers Aron Silverton
2020-05-14 18:18   ` santosh.shilimkar
2020-05-14 19:42     ` Max Gurtovoy
2020-05-14 22:23     ` Sagi Grimberg
2020-05-14 23:41       ` santosh.shilimkar
2020-05-15 16:52         ` Tom Talpey
2020-05-15 18:59           ` Sagi Grimberg
2020-05-17 10:51             ` Max Gurtovoy
2020-05-18 16:34               ` santosh.shilimkar
2020-05-15  0:37       ` Max Gurtovoy
2020-05-14 16:00 ` Gal Pressman
2020-05-17 10:37   ` Max Gurtovoy
2020-05-18 15:20 ` Dennis Dalessandro
2020-05-18 18:10   ` Jason Gunthorpe
2020-05-19 13:43     ` Dennis Dalessandro
2020-05-19 13:53       ` Jason Gunthorpe
2020-05-19 14:19         ` Leon Romanovsky
2020-05-19 14:26           ` Dennis Dalessandro
2020-05-19 14:30             ` Jason Gunthorpe
2020-05-19 14:37               ` Dennis Dalessandro
2020-05-23 22:08                 ` Jason Gunthorpe [this message]
2020-05-24  1:27                   ` Tom Talpey
2020-05-26 15:38                   ` Dennis Dalessandro

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