cvs commit: src/sys/netinet ip_fw2.c
glebius at FreeBSD.org
Tue Dec 6 02:45:51 PST 2005
glebius 2005-12-06 10:45:49 UTC
FreeBSD src repository
Optimize parallel processing of ipfw(4) rulesets eliminating the locking
of the radix lookup tables. Since several rnh_lookup() can run in
parallel on the same table, we can piggyback on the shared locking
provided by ipfw(4).
However, the single entry cache in the ip_fw_table can't be used lockless,
so it is removed. This pessimizes two cases: processing of bursts of similar
packets and matching one packet against the same table several times during
one ipfw_chk() lookup. To optimize the processing of similar packet bursts
administrator should use stateful firewall. To optimize the second problem
a solution will be provided soon.
o Since we piggyback on the ipfw(4) locking, and the latter is per-chain,
the tables are moved from the global declaration to the
o The struct ip_fw_table is shrunk to one entry and thus vanished.
o All table manipulating functions are extended to accept the struct
ip_fw_chain * argument.
o All table modifing functions use IPFW_WLOCK_ASSERT().
Revision Changes Path
1.118 +54 -71 src/sys/netinet/ip_fw2.c
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