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Do not reference returned ifa in in6_ifawithifp().

Description

Do not reference returned ifa in in6_ifawithifp().

The only place where in6_ifawithifp() is used is ip6_output(),
which uses the returned ifa to bump traffic counters.
Given ifa stability guarantees is provided by epoch, do not refcount ifa.

This eliminates 2 atomic ops from IPv6 fast path.

Reviewed By: rstone
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D28649

Details

Provenance
melifaroAuthored on Feb 14 2021, 10:11 AM
Reviewer
rstone
Differential Revision
D28649: Do not reference returned ifa in in6_ifawithifp().
Parents
R10:25c6318c7906: procstat: distinguish vm map guards in procstat vm output.
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