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| author |   David S. Miller <davem@davemloft.net> | 2012-06-29 01:32:45 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-06-29 01:36:36 -0700 |
| commit | 7a9bc9b81a5bc6e44ebc80ef781332e4385083f2 (patch) | |
| tree | 1342c672823d47bfb112fee63951af9f6a3eb590 /drivers/net | |
| parent | net: l2tp_eth: provide tx_dropped counter (diff) | |
| download | linux-dev-7a9bc9b81a5bc6e44ebc80ef781332e4385083f2.tar.xz linux-dev-7a9bc9b81a5bc6e44ebc80ef781332e4385083f2.zip | |
ipv4: Elide fib_validate_source() completely when possible.
If rpfilter is off (or the SKB has an IPSEC path) and there are not
tclassid users, we don't have to do anything at all when
fib_validate_source() is invoked besides setting the itag to zero.
We monitor tclassid uses with a counter (modified only under RTNL and
marked __read_mostly) and we protect the fib_validate_source() real
work with a test against this counter and whether rpfilter is to be
done.
Having a way to know whether we need no tclassid processing or not
also opens the door for future optimized rpfilter algorithms that do
not perform full FIB lookups.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
0 files changed, 0 insertions, 0 deletions