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Wed, 07 Oct 2026 15:07:22 -0700 (PDT) From: Azadeh Aftahi Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3864.700.51.1.1\)) Subject: [RFC] virtio-net: AF_XDP zero-copy TX checksum offload Message-Id: <247B8E70-8100-419A-95C4-71E43361FF73@gmail.com> Date: Wed, 7 Oct 2026 17:07:12 -0500 To: netdev@vger.kernel.org, virtualization@lists.linux.dev, bpf@vger.kernel.org X-Mailer: Apple Mail (2.3864.700.51.1.1) Hi all, I'm planning to work on single-buffer AF_XDP zero-copy TX checksum = offload for virtio-net. Current net-next's virtnet_xsk_xmit_one() does not consume XSK TX = checksum metadata and uses the shared zeroed virtio header. I found Xuan's 2021 proposal anticipating separate headers for checksum = support, and the merged 2024 zero-copy TX series,=20 but I couldn't find a checksum-specific follow-up implementation. The proposed scope is to map the existing XSK checksum metadata API to = VIRTIO_NET_F_CSUM,=20 using a DMA-safe per-packet virtio header whose lifetime extends until = TX completion, with corresponding completion, reset, and unbind cleanup. I would keep the initial scope limited to single-buffer TX: no = multi-buffer RX, timestamps, launch time, or GSO. I'd also add checksum and header-lifetime coverage using the existing = XSK selftest framework with QEMU/TAP. Is anyone already working on this? If not, does this scope and = per-packet-header approach sound reasonable for a follow-up patch? Thanks, Azadeh=