Diffusion FreeBSD src repository d6c4cea7740d

loopback: improve checksum offloading
d6c4cea7740d
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Description

loopback: improve checksum offloading

Allow disabling IFCAP_RXCSUM_IPV6 or IFCAP_TXCSUM_IPV6.
Do not pretend the checksum is correct by setting the LO_CSUM_SET flags if IFCAP_RXCSUM_IPV6 or IFCAP_RXCSUM is enabled. Instead, remove the LO_CSUM_SET flags (in case they have been set somehow) if IFCAP_RXCSUM_IPV6 or IFCAP_RXCSUM is disabled.
Do not unset the transmit checksum offload flags LO_CSUM_FEATURES or LO_CSUM_FEATURES6 since they now have a meaning for the receive path.

Reviewed by: glebius, pouria, tuexen
Okayed by: bz
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D57518

Details

Provenance

timo.voelker_fh-muenster.de	Authored on Jun 28 2026, 10:50 AM
tuexen	Committed on Jun 28 2026, 10:50 AM

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Differential Revision

D57518: loopback: checksum offloading

Parents

rG07b5d1ca52b1: virtio_pci_modern: Remove endianness conversion for config space

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Reverted By

rG1b8d19dea462: Revert "loopback: improve checksum offloading"

Event Timeline

tuexen committed rGd6c4cea7740d: loopback: improve checksum offloading (authored by timo.voelker_fh-muenster.de).Jun 28 2026, 10:50 AM

tuexen added an edge: D57518: loopback: checksum offloading.Jun 28 2026, 10:58 AM

tuexen mentioned this in rGfd3582e683d6: loopback: improve checksum offloading.Aug 6 2026, 8:23 AM

tuexen mentioned this in rG265b3e15abf6: loopback: improve checksum offloading.Aug 6 2026, 9:04 AM

tuexen added a reverting change: rG1b8d19dea462: Revert "loopback: improve checksum offloading".Aug 6 2026, 4:57 PM

Changes (2)

Path

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share/

man/

man4/

sys/

net/

rGd6c4cea7740d

share/man/man4/lo.4

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sys/net/if_loop.c

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