This series is aimed at improving the act_mirred redirect performances. Such action is used by OVS to represent TC S/W flows, and it's current largest bottle-neck is the need for a skb_clone() for each packet.
The first 2 patches introduce some cleanup and safeguards to allow extending tca_result: we will use it to store RCU protected redirect information. Then a new tca_action value is introduced: TC_ACT_MIRRED, similar to TC_ACT_REDIRECT, but preserving the mirred semantic. The last patch exploits the introduced infrastructure in the act_mirred action, to avoid a skb_clone, when possible. Overall this the above gives a ~10% performance improvement in forwarding tput, when using the TC S/W datapath. v1 -> v2: - preserve the rcu lock in act_bpf - add and use a new action value to reinject the packets, preserving the mirred semantic Paolo Abeni (4): tc/act: user space can't use TC_ACT_REDIRECT directly tc/act: remove unneeded RCU lock in action callback net/tc: introduce TC_ACT_MIRRED. act_mirred: use ACT_MIRRED when possible include/net/act_api.h | 2 +- include/net/sch_generic.h | 21 +++++++++++++++++++++ include/uapi/linux/pkt_cls.h | 2 ++ net/core/dev.c | 4 ++++ net/sched/act_api.c | 7 +++++++ net/sched/act_csum.c | 12 +++--------- net/sched/act_ife.c | 5 +---- net/sched/act_mirred.c | 35 +++++++++++++++++++++++------------ net/sched/act_sample.c | 4 +--- net/sched/act_skbedit.c | 10 +++------- net/sched/act_skbmod.c | 21 +++++++++------------ net/sched/act_tunnel_key.c | 6 +----- net/sched/act_vlan.c | 19 +++++++------------ 13 files changed, 83 insertions(+), 65 deletions(-) -- 2.17.1
