CVSROOT: /cvs
Module name: src
Changes by: [email protected] 2025/12/17 19:14:09
Modified files:
sys/net : if_vlan.c
Log message:
take advantage of if_vinput not sleeping now to avoid real refcnts
the vlan tag hash was an array of smr protectect lists. previously
when we found a vlan interface in the tag hash we'd take a real ref
(refcnt_take) to that interface before pushing it through the network
stack with if_vinput. we did this because the network stack can
sleep, and you can't sleep in an smr critical section.
now that if_vinput simply queues the packet without sleeping, we
can call it from the smr critical section and skip taking and
releasing real refs with atomic ops. this is a win if the vlan
parent interfaces are multiq and doing a lot of packets across
multiple softnet threads because the cacheline the refcnt is on
doesnt have to be modified, hopefully it can be shared (or not used
at all) instead.
