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tcp: Make hostcache.cache_count MPSAFE by using a counter_u64_t

Description

tcp: Make hostcache.cache_count MPSAFE by using a counter_u64_t

Addressing the underlying root cause for cache_count to
show unexpectedly high values, by protecting all arithmetic on
that global variable by using counter(9).

PR: 254333
Reviewed By: tuexen, transport
MFC after: 2 weeks
Sponsored by: NetApp, Inc.
Differential Revision: https://reviews.freebsd.org/D29510

Details

Provenance
rscheffAuthored on Mar 31 2021, 5:30 PM
Reviewer
transport
Differential Revision
D29510: tcp: Make hostcache.cache_count MPSAFE by using a counter_u64_t
Parents
R10:539489326947: cxgbe/t4_tom: restore socket's protosw before entering TIME_WAIT.
Branches
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