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From: Leon Romanovsky <leon@kernel.org>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>,
	linux-rdma@vger.kernel.org,
	Selvin Xavier <selvin.xavier@broadcom.com>,
	Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>,
	patches@lists.linux.dev
Subject: Re: [PATCH v2 00/13] Provide udata helpers and use them in bnxt_re
Date: Mon, 2 Mar 2026 21:24:13 +0200	[thread overview]
Message-ID: <20260302192413.GS12611@unreal> (raw)
In-Reply-To: <0-v2-13af4a900857+4f13-bnxt_re_uapi_jgg@nvidia.com>

On Thu, Feb 26, 2026 at 09:11:03PM -0400, Jason Gunthorpe wrote:
> Add new helpers that entirely execute the expected common patterns for
> driver data uAPI forward and backwards compatibility so that drivers don't
> have to open code these.

<...>

> Since bnxt_re has never implemented these rules correctly and now does,
> provide a UCTX flag to tell userspace about it. If
> BNXT_RE_UCNTX_CMASK_UAPI_COMPAT_SUPPORTED is not set then userspace must
> not use any request or response fields beyond the current kernel uAPI.
> 
> Using any new fields is only possible on kernels with the flag.

Does a similar flag exist in any other driver? If so, we should consider
making it global to ib_uverbs. If not, keeping it bnxt_re‑specific is
sufficient.

Thanks

> 
> A series converting all drivers to these new helpers is on github, I will
> send it later:
> 
> https://github.com/jgunthorpe/linux/commits/rdma_uapi/

  parent reply	other threads:[~2026-03-02 19:24 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-02-27  1:11 [PATCH v2 00/13] Provide udata helpers and use them in bnxt_re Jason Gunthorpe
2026-02-27  1:11 ` [PATCH v2 01/13] RDMA: Use copy_struct_from_user() instead of open coding Jason Gunthorpe
2026-02-27  1:11 ` [PATCH v2 02/13] RDMA/core: Add rdma_udata_to_dev() Jason Gunthorpe
2026-03-02 19:30   ` Leon Romanovsky
2026-03-02 19:36     ` Jason Gunthorpe
2026-02-27  1:11 ` [PATCH v2 03/13] RDMA: Add ib_copy_validate_udata_in() Jason Gunthorpe
2026-02-27  7:50   ` kernel test robot
2026-02-28 10:24   ` kernel test robot
2026-02-27  1:11 ` [PATCH v2 04/13] RDMA: Add ib_copy_validate_udata_in_cm() Jason Gunthorpe
2026-02-27  1:11 ` [PATCH v2 05/13] RDMA: Add ib_respond_udata() Jason Gunthorpe
2026-02-27  1:11 ` [PATCH v2 06/13] RDMA: Add ib_is_udata_in_empty() Jason Gunthorpe
2026-02-27  1:11 ` [PATCH v2 07/13] RDMA: Provide documentation about the uABI compatibility rules Jason Gunthorpe
2026-02-27  1:11 ` [PATCH v2 08/13] RDMA/bnxt_re: Add compatibility checks to the uapi path Jason Gunthorpe
2026-02-27  1:11 ` [PATCH v2 09/13] RDMA/bnxt_re: Add compatibility checks to the uapi path for no data Jason Gunthorpe
2026-02-27  1:11 ` [PATCH v2 10/13] RDMA/bnxt_re: Add missing comp_mask validation Jason Gunthorpe
2026-02-27  1:11 ` [PATCH v2 11/13] RDMA/bnxt_re: Use ib_respond_udata() Jason Gunthorpe
2026-02-27  1:11 ` [PATCH v2 12/13] RDMA/bnxt_re: Use ib_respond_empty_udata() Jason Gunthorpe
2026-02-27  1:11 ` [PATCH v2 13/13] RDMA/bnxt_re: Add BNXT_RE_UCNTX_CMASK_UAPI_COMPAT_SUPPORTED Jason Gunthorpe
2026-03-02 19:24 ` Leon Romanovsky [this message]
2026-03-02 19:33   ` [PATCH v2 00/13] Provide udata helpers and use them in bnxt_re Jason Gunthorpe

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