From: Christoph Hellwig <hch@lst.de>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: Leon Romanovsky <leon@kernel.org>, Christoph Hellwig <hch@lst.de>,
Bart Van Assche <bvanassche@acm.org>,
Doug Ledford <dledford@redhat.com>,
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Zhu Yanjun <zyjzyj2000@gmail.com>
Subject: Re: [PATCH rdma-next 01/10] RDMA: Add access flags to ib_alloc_mr() and ib_mr_pool_init()
Date: Tue, 6 Apr 2021 14:30:34 +0200 [thread overview]
Message-ID: <20210406123034.GA28930@lst.de> (raw)
In-Reply-To: <20210406121312.GK7405@nvidia.com>
On Tue, Apr 06, 2021 at 09:13:12AM -0300, Jason Gunthorpe wrote:
> So we broadly have two choice
> 1) Diverge the kernel and user interfaces and make the RDMA drivers
> special case all the kernel stuff to force
> ACCESS_RELAXED_ORDERING when they are building MRs and processing
> FMR WQE's
> 2) Keep the two interfaces the same and push the
> ACCESS_RELAXED_ORDERING to a couple of places in the ULPs so the
> drivers see a consistent API
>
> They are both poor choices, but I think #2 has a greater chance of
> everyone doing their parts correctly.
No, 1 is the only sensible choice. The userspace verbs interface is
a mess and should not inflict pain on the kernel in any way. We've moved
away from a lot of the idiotic "Verbs API" concepts with things like
how we handle the global lkey, the new CQ API and the RDMA R/W
abstraction and that massively helped the kernel ecosystem.
next prev parent reply other threads:[~2021-04-06 12:30 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-05 5:23 [PATCH rdma-next 00/10] Enable relaxed ordering for ULPs 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 [this message]
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
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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