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| author | Paolo Abeni <pabeni@redhat.com> | 2019-11-20 13:47:37 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-11-21 14:45:55 -0800 |
| commit | 02b24941619fcce3d280311ac73b1e461552e9c8 (patch) | |
| tree | e034d97436dfa8b32deff124f3ab172648aef9e4 /include/net | |
| parent | c43c3d76c021d8d654ff5cfaad381f14f6beaf1a (diff) | |
| download | lwn-02b24941619fcce3d280311ac73b1e461552e9c8.tar.gz lwn-02b24941619fcce3d280311ac73b1e461552e9c8.zip | |
ipv4: use dst hint for ipv4 list receive
This is alike the previous change, with some additional ipv4 specific
quirk. Even when using the route hint we still have to do perform
additional per packet checks about source address validity: a new
helper is added to wrap them.
Hints are explicitly disabled if the destination is a local broadcast,
that keeps the code simple and local broadcast are a slower path anyway.
UDP flood performances vs recvmmsg() receiver:
vanilla patched delta
Kpps Kpps %
1683 1871 +11
In the worst case scenario - each packet has a different
destination address - the performance delta is within noise
range.
v3 -> v4:
- re-enable hints for forward
v2 -> v3:
- really fix build (sic) and hint usage check
- use fib4_has_custom_rules() helpers (David A.)
- add ip_extract_route_hint() helper (Edward C.)
- use prev skb as hint instead of copying data (Willem)
v1 -> v2:
- fix build issue with !CONFIG_IP_MULTIPLE_TABLES
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/route.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/net/route.h b/include/net/route.h index 6c516840380d..a9c60fc68e36 100644 --- a/include/net/route.h +++ b/include/net/route.h @@ -185,6 +185,10 @@ int ip_route_input_rcu(struct sk_buff *skb, __be32 dst, __be32 src, u8 tos, struct net_device *devin, struct fib_result *res); +int ip_route_use_hint(struct sk_buff *skb, __be32 dst, __be32 src, + u8 tos, struct net_device *devin, + const struct sk_buff *hint); + static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, u8 tos, struct net_device *devin) { |