[Bug 165059] vtnet(4): Networking breaks with a router using virtio net driver on KVM host
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Date: Thu, 04 Sep 2025 11:27:12 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=165059
--- Comment #47 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:
URL:
https://cgit.FreeBSD.org/src/commit/?id=1c23d8f9f39870951c1d0dfbb112fc4e53237737
commit 1c23d8f9f39870951c1d0dfbb112fc4e53237737
Author: Michael Tuexen <tuexen@FreeBSD.org>
AuthorDate: 2025-09-04 11:16:46 +0000
Commit: Michael Tuexen <tuexen@FreeBSD.org>
CommitDate: 2025-09-04 11:16:46 +0000
vtnet: improve checksum offloading
When transmitting a packet over the vtnet interface, map the
csum flags CSUM_DATA_VALID | CSUM_PSEUDO_HDR to the virtio
flag VIRTIO_NET_HDR_F_DATA_VALID.
When receiving a packet over the virtio network channel, translate
the virtio flag VIRTIO_NET_HDR_F_NEEDS_CSUM not to CSUM_DATA_VALID |
CSUM_PSEUDO_HDR, but to CSUM_TCP, CSUM_TCP_IPV6, CSUM_UDP, or
CSUM_UDP_IPV6.
The second change fixes a series of issue related to checksum
offloading for if_vtnet.
While there, improve the stats counters to allow a detailed view
on what is going on in relation to checksum offloading.
PR: 165059
Reviewed by: tuexen, manpages
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D51686
share/man/man4/vtnet.4 | 28 +++--
sys/dev/virtio/network/if_vtnet.c | 220 ++++++++++++++++++-----------------
sys/dev/virtio/network/if_vtnetvar.h | 2 +-
3 files changed, 132 insertions(+), 118 deletions(-)
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