Date: Mon, 13 Jan 2020 23:26:24 +0000 From: bugzilla-noreply@freebsd.org To: virtualization@FreeBSD.org Subject: [Bug 236922] Virtio fails as QEMU-KVM guest with Q35 chipset on Ubuntu 18.04.2 LTS Message-ID: <bug-236922-27103-Yu4fgH0Q8v@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-236922-27103@https.bugs.freebsd.org/bugzilla/> References: <bug-236922-27103@https.bugs.freebsd.org/bugzilla/>
next in thread | previous in thread | raw e-mail | index | archive | help
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D236922 --- Comment #38 from Tommy P <tommyhp2@gmail.com> --- Created attachment 210723 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D210723&action= =3Dedit Recent update in stable/12 for VirtIO r347233: Remove non-functional SCTP checksum offload support for virtio. Checksum offloading for SCTP is not currently specified for virtio. If the hypervisor announces checksum offloading support, it means TCP and UDP checksum offload. If an SCTP packet is sent and the host announced checksum offload support, the hypervisor inserts the IP checksum (16-bit) at the correct offset, but this is not the right checksum, which is a CRC32= c. This results in all outgoing packets having the wrong checksum and therefore breaking SCTP based communications. This patch removes SCTP checksum offloading support from the virtio network interface. Thanks to Felix Weinrank for making me aware of the issue. Reviewed by: bryanv@ MFC after: 1 week https://svnweb.freebsd.org/base?view=3Drevision&revision=3D347233 ------------------------------------------------------------- r349285: VirtIO SCSI: validate seg_max on attach Until r349278, bhyve presented a seg_max to the guest that was too large. Detect this case and clamp it to the virtqueue size. Otherwise, we would fail the "too many segments to enqueue" assertion in virtqueue_enqueue(). I hit this by running a guest with a MAXPHYS of 256 KB. Reviewed by: bryanv cem MFC after: 1 week Sponsored by: Dell EMC Isilon https://svnweb.freebsd.org/base?view=3Drevision&revision=3D349285 --=20 You are receiving this mail because: You are the assignee for the bug.=
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?bug-236922-27103-Yu4fgH0Q8v>