Linux-RDMA Archive on lore.kernel.org
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From: Tom Talpey <tom@talpey.com>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: Haakon Bugge <haakon.bugge@oracle.com>,
	David Laight <David.Laight@aculab.com>,
	Chuck Lever III <chuck.lever@oracle.com>,
	Christoph Hellwig <hch@lst.de>, Leon Romanovsky <leon@kernel.org>,
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Subject: Re: [PATCH rdma-next 00/10] Enable relaxed ordering for ULPs
Date: Wed, 14 Apr 2021 10:16:28 -0400
Message-ID: <02593083-056e-cc62-22cf-d6bd6c9b18a8@talpey.com> (raw)
In-Reply-To: <20210412224843.GQ7405@nvidia.com>

On 4/12/2021 6:48 PM, Jason Gunthorpe wrote:
> On Mon, Apr 12, 2021 at 04:20:47PM -0400, Tom Talpey wrote:
> 
>> So the issue is only in testing all the providers and platforms,
>> to be sure this new behavior isn't tickling anything that went
>> unnoticed all along, because no RDMA provider ever issued RO.
> 
> The mlx5 ethernet driver has run in RO mode for a long time, and it
> operates in basically the same way as RDMA. The issues with Haswell
> have been worked out there already.
> 
> The only open question is if the ULPs have errors in their
> implementation, which I don't think we can find out until we apply
> this series and people start running their tests aggressively.

I agree that the core RO support should go in. But turning it on
by default for a ULP should be the decision of each ULP maintainer.
It's a huge risk to shift all the storage drivers overnight. How
do you propose to ensure the aggressive testing happens?

One thing that worries me is the patch02 on-by-default for the dma_lkey.
There's no way for a ULP to prevent IB_ACCESS_RELAXED_ORDERING
from being set in __ib_alloc_pd().

Tom.



  reply index

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-05  5:23 Leon Romanovsky
2021-04-05  5:23 ` [PATCH rdma-next 01/10] RDMA: Add access flags to ib_alloc_mr() and ib_mr_pool_init() Leon Romanovsky
2021-04-05 13:46   ` Christoph Hellwig
2021-04-06  5:24     ` Leon Romanovsky
2021-04-05 15:27   ` Bart Van Assche
2021-04-06  5:23     ` Leon Romanovsky
2021-04-06  5:27       ` Christoph Hellwig
2021-04-06  5:58         ` Leon Romanovsky
2021-04-06 12:13           ` Jason Gunthorpe
2021-04-06 12:30             ` Christoph Hellwig
2021-04-06 14:04               ` Jason Gunthorpe
2021-04-06 14:15                 ` Christoph Hellwig
2021-04-06 14:40                   ` Jason Gunthorpe
2021-04-06 14:54                     ` Christoph Hellwig
2021-04-06 15:03                       ` Christoph Hellwig
2021-04-07 18:28                       ` Jason Gunthorpe
2021-04-05  5:23 ` [PATCH rdma-next 02/10] RDMA/core: Enable Relaxed Ordering in __ib_alloc_pd() Leon Romanovsky
2021-04-05 18:01   ` Tom Talpey
2021-04-05 20:40     ` Adit Ranadive
2021-04-06  6:28     ` Leon Romanovsky
2021-04-05  5:23 ` [PATCH rdma-next 03/10] RDMA/iser: Enable Relaxed Ordering Leon Romanovsky
2021-04-05  5:23 ` [PATCH rdma-next 04/10] RDMA/rtrs: " Leon Romanovsky
2021-04-05  5:23 ` [PATCH rdma-next 05/10] RDMA/srp: " Leon Romanovsky
2021-04-05  5:24 ` [PATCH rdma-next 06/10] nvme-rdma: " Leon Romanovsky
2021-04-05  5:24 ` [PATCH rdma-next 07/10] cifs: smbd: " Leon Romanovsky
2021-04-05  5:24 ` [PATCH rdma-next 08/10] net/rds: " Leon Romanovsky
2021-04-05  5:24 ` [PATCH rdma-next 09/10] net/smc: " Leon Romanovsky
2021-04-05  5:24 ` [PATCH rdma-next 10/10] xprtrdma: " Leon Romanovsky
2021-04-05 13:41 ` [PATCH rdma-next 00/10] Enable relaxed ordering for ULPs Christoph Hellwig
2021-04-05 14:08   ` Leon Romanovsky
2021-04-05 16:11     ` Santosh Shilimkar
2021-04-05 17:54     ` Tom Talpey
2021-04-05 20:07   ` Jason Gunthorpe
2021-04-05 23:42     ` Chuck Lever III
2021-04-05 23:50       ` Keith Busch
2021-04-06  5:12       ` Leon Romanovsky
2021-04-06 11:49       ` Jason Gunthorpe
2021-04-09 14:26         ` Tom Talpey
2021-04-09 14:45           ` Chuck Lever III
2021-04-09 15:32             ` Tom Talpey
2021-04-09 16:27               ` Haakon Bugge
2021-04-09 17:49                 ` Tom Talpey
2021-04-10 13:30                   ` David Laight
2021-04-12 18:32                     ` Haakon Bugge
2021-04-12 20:20                       ` Tom Talpey
2021-04-12 22:48                         ` Jason Gunthorpe
2021-04-14 14:16                           ` Tom Talpey [this message]
2021-04-14 14:41                             ` David Laight
2021-04-14 14:49                               ` Jason Gunthorpe
2021-04-14 14:44                             ` Jason Gunthorpe
2021-04-09 16:40           ` Jason Gunthorpe
2021-04-09 17:44             ` Tom Talpey
2021-04-06  2:37 ` Honggang LI
2021-04-06  5:09   ` Leon Romanovsky
2021-04-06 11:53     ` Jason Gunthorpe
2021-04-11 10:09       ` Max Gurtovoy

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