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[35.185.200.132]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cbed8bdaeb5sm1461553a12.11.2026.08.11.14.22.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Aug 2026 14:22:53 -0700 (PDT) Date: Tue, 11 Aug 2026 21:22:50 +0000 From: David Matlack To: Jason Gunthorpe Cc: Alex Williamson , Justin Stitt , kvm@vger.kernel.org, Leon Romanovsky , linux-kselftest@vger.kernel.org, linux-rdma@vger.kernel.org, llvm@lists.linux.dev, Mark Bloch , Bill Wendling , Nathan Chancellor , Nick Desaulniers , netdev@vger.kernel.org, Saeed Mahameed , Shuah Khan , Tariq Toukan , patches@lists.linux.dev Subject: Re: [PATCH v3 11/11] vfio: selftests: mlx5 driver - add send_msi support Message-ID: References: <0-v3-76f117ad04f1+28a90-mlx5st_jgg@nvidia.com> <11-v3-76f117ad04f1+28a90-mlx5st_jgg@nvidia.com> Precedence: bulk X-Mailing-List: netdev@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: <11-v3-76f117ad04f1+28a90-mlx5st_jgg@nvidia.com> On 2026-07-16 02:03 PM, Jason Gunthorpe wrote: > Wire an MSI-X vector to a dedicated EQ so the mlx5 driver supports > send_msi(). > > Each EQ can be linked to an MSI-X vector, and the CQ can be set up > to deliver an event to the EQ. Thus, when everything is armed, an > RDMA WRITE posted to the QP generates a CQE, which generates an > EQE, which generates an MSI-X. > > To keep things simple this just re-uses all the existing QPs and > CQs, so they generate single MSIs during memcpy. > > send_msi() drains any accumulated MSI EQ events from prior memcpy > completions, posts a small signaled RDMA Write, then polls the CQ to > consume the resulting CQE (avoiding stale completions on subsequent > test cycles). > > Assisted-by: Claude:claude-opus-4.6 > Signed-off-by: Jason Gunthorpe Acked-by: David Matlack