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[47.54.130.67]) by smtp.gmail.com with ESMTPSA id af79cd13be357-92e7ffdfe9bsm270647385a.5.2026.07.02.11.01.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Jul 2026 11:01:59 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1wfLja-00000006Onh-4AvZ; Thu, 02 Jul 2026 15:01:59 -0300 Date: Thu, 2 Jul 2026 15:01:58 -0300 From: Jason Gunthorpe To: Konstantin Taranov Cc: kotaranov@microsoft.com, shirazsaleem@microsoft.com, longli@microsoft.com, leon@kernel.org, linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH rdma-next 1/1] RDMA/mana_ib: Adopt robust udata Message-ID: <20260702180158.GU7525@ziepe.ca> References: <20260623114444.1429042-1-kotaranov@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260623114444.1429042-1-kotaranov@linux.microsoft.com> On Tue, Jun 23, 2026 at 04:44:43AM -0700, Konstantin Taranov wrote: > +struct mana_ib_uctx_req { > + __aligned_u64 client_caps1; > + __aligned_u64 client_caps2; > + __aligned_u64 client_caps3; > + __aligned_u64 client_caps4; > + __aligned_u64 comp_mask; > +}; I think Jacob has it right, This is looking pretty gross. If you want such a complex protocol then use the new ioctl format and declare sensible driver specific attributes. Nobody has converted alloc_ucontext yet, but that is usually not hard to do. Then you can use the existing mandatory/optional schemes to pass whatever is appropriate with full easy compat. So maybe split this part out, the rst of the udata fiddling looks OK Jason