vtnet: improve interface capability handling
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Authored by tuexen on Sep 22 2025, 8:00 PM.

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Reviewers

timo.voelker_fh-muenster.de
kp
bryanv
bcr

Group Reviewers

manpages

Commits

rGfed8dbe794a6: vtnet: improve interface capability handling
rGc0598ba49d2c: vtnet: improve interface capability handling
rGeaf619fddcb2: vtnet: improve interface capability handling

Summary

Enable the handling of the IFCAP_RXCSUM_IPV6 handling by handling IFCAP_RXCSUM and IFCAP_RXCSUM_IPV6 as a pair.
Also make clear, that software and hardware LRO require receive checksum offload.

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rG FreeBSD src repository

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Event Timeline

tuexen created this revision.Sep 22 2025, 8:00 PM

Herald added subscribers: ziaee, imp. · View Herald TranscriptSep 22 2025, 8:00 PM

tuexen requested review of this revision.Sep 22 2025, 8:00 PM

tuexen added a reviewer: manpages.

timo.voelker_fh-muenster.de added inline comments.Sep 25 2025, 3:38 PM

sys/dev/virtio/network/if_vtnet.c
1373	IPv6 has no checksum. How about this * VirtIO does not distinguish between IPv4 and IPv6, * it uses only the one feature flag VIRTIO_NET_F_GUEST_CSUM, * so treat them as a pair.

Improve comments.

tuexen marked an inline comment as done.Sep 25 2025, 6:34 PM

tuexen added inline comments.

sys/dev/virtio/network/if_vtnet.c
1373	I think the comment is now clearer.

Removing the ifdefs and allow receive checksum offloading for IPv6 is a good thing. Also, enabling/disabling receive checksum pairwise for IPv4 and IPv6 make sense for VirtIO.

This revision is now accepted and ready to land.Sep 26 2025, 7:15 AM