net_sched: sch_fq: clear past skb->tstamp if offloading pacing

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When hardware offload is enabled, FQ will forward packets to the
netdevice for pacing. The device has to test that skb->tstamp is
in the future.

Avoid this cost for packets whose txtime has already passed, by
clearing skb->tstamp.

Also clear slightly into the future, for EDT timestamps that are
so close to now that they fall within a reasonable normal Tx
latency. This slack is set to 400 nsec.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20260910171131.2532487-4-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Willem de Bruijn 2026-09-10 13:10:22 -04:00 • committed by Jakub Kicinski

parent 8036cbf026

commit e628a85c69

1 changed files with 15 additions and 3 deletions

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net/sched/sch_fq.c

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