[Bug 165059] vtnet(4): Networking breaks with a router using virtio net driver on KVM host

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=165059

--- Comment #51 from [email protected] ---
A commit in branch stable/14 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=07625c420dc30cc484018c269bb7a212436ded8a

commit 07625c420dc30cc484018c269bb7a212436ded8a
Author:     Timo Völker <[email protected]>
AuthorDate: 2025-09-08 20:38:49 +0000
Commit:     Michael Tuexen <[email protected]>
CommitDate: 2025-09-11 06:35:43 +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
    Differential Revision:  https://reviews.freebsd.org/D51686

    (cherry picked from commit 3008f30d2c2cabdd7e17f7fb922139da8681ffbd)

 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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