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[2a10:fc81:a806:d6a9::1]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45eb6cce01asm36478471f8f.11.2026.05.26.05.44.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 May 2026 05:44:33 -0700 (PDT) From: Stefano Brivio To: Laurent Vivier Subject: Re: [PATCH v11 0/3] vhost-user,udp: Handle multiple iovec entries per virtqueue element Message-ID: <20260526144431.0dfd9ec2@elisabeth> In-Reply-To: <20260520095526.21519-1-lvivier@redhat.com> References: <20260520095526.21519-1-lvivier@redhat.com> Organization: Red Hat X-Mailer: Claws Mail 4.2.0 (GTK 3.24.49; x86_64-pc-linux-gnu) MIME-Version: 1.0 Date: Tue, 26 May 2026 14:44:33 +0200 (CEST) X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: twKlqdTgaPaBYesSG9730ZTUhJ7FseZoj7mlu8XKqRI_1779799475 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Message-ID-Hash: 7EYUB7UYSHZVCVUXWHQR6J7XLYHVP53V X-Message-ID-Hash: 7EYUB7UYSHZVCVUXWHQR6J7XLYHVP53V X-MailFrom: sbrivio@redhat.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: passt-dev@passt.top X-Mailman-Version: 3.3.8 Precedence: list List-Id: Development discussion and patches for passt Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On Wed, 20 May 2026 11:55:23 +0200 Laurent Vivier wrote: > Some virtio-net drivers (notably iPXE) provide descriptors where the > vnet header and the frame payload are in separate buffers, resulting in > two iovec entries per virtqueue element. Currently, the RX (host to > guest) path assumes a single iovec per element, which triggers: > > ASSERTION FAILED in virtqueue_map_desc (virtio.c:403): > num_sg < max_num_sg > > This series reworks the UDP vhost-user receive path to support multiple > iovec entries per element, fixing the iPXE crash. > > This series only addresses the UDP path. TCP vhost-user will be > updated to use multi-iov elements in a subsequent series. > > v11: > - Rebase on master > - use sizeof(*uh) instead of sizeof(struct udphdr) in > udp_tap_prepare() > - improve @payload doc in udp_vu_sock_recv() > - add R-b from David Applied. -- Stefano