This patch series try to unify the dst cache implementations currently present in the kernel, namely in ip_tunnel.c and ip6_tunnel.c, introducing a new generic implementation, replacing the existing ones, and then using the new implementation in other tunnel devices which currently lack it.
The new dst implementation is compiled, as built-in, only if any device using it is enabled. Caching the dst for the tunnel remote address gives small, but measurable, performance improvement when tunneling over ipv4 (in the 2%-4% range) and significant ones when tunneling over ipv6 (roughly 60% when no fragmentation/segmentation take place and the tunnel local address is not specified). Paolo Abeni (7): net: add dst_cache support net: replace dst_cache ip6_tunnel implementation with the generic one ip_tunnel: replace dst_cache with generic implementation net: use dst_cache for vxlan device net: add dst_cache to ovs vxlan lwtunnel geneve: add dst caching support net/ipv4: add dst cache support for gre lwtunnels drivers/net/geneve.c | 39 +++++++++++ drivers/net/vxlan.c | 85 ++++++++++++++++++------ include/net/dst_cache.h | 97 +++++++++++++++++++++++++++ include/net/ip6_tunnel.h | 14 +--- include/net/ip_tunnels.h | 10 +-- include/net/vxlan.h | 1 + net/Kconfig | 4 ++ net/core/Makefile | 1 + net/core/dst_cache.c | 147 +++++++++++++++++++++++++++++++++++++++++ net/ipv4/Kconfig | 1 + net/ipv4/ip_gre.c | 17 ++++- net/ipv4/ip_tunnel.c | 78 ++++------------------ net/ipv6/Kconfig | 1 + net/ipv6/ip6_gre.c | 12 ++-- net/ipv6/ip6_tunnel.c | 103 ++--------------------------- net/ipv6/ip6_vti.c | 2 +- net/ipv6/sit.c | 17 ++--- net/openvswitch/Kconfig | 1 + net/openvswitch/flow.h | 1 + net/openvswitch/flow_netlink.c | 11 +++ 20 files changed, 423 insertions(+), 219 deletions(-) create mode 100644 include/net/dst_cache.h create mode 100644 net/core/dst_cache.c -- 1.8.3.1
