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net_sched: act_mirred: remove spinlock in fast path

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Like act_gact, act_mirred can be lockless in packet processing

1) Use percpu stats
2) update lastuse only every clock tick to avoid false sharing
3) use rcu to protect tcfm_dev
4) Remove spinlock usage, as it is no longer needed.

Next step : add multi queue capability to ifb device

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: John Fastabend <john.fastabend@gmail.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2015-07-06 05:18:09 -07:00
committed by David S. Miller
parent 56e5d1ca18
commit 2ee22a90c7
2 changed files with 31 additions and 28 deletions
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2
include/net/tc_act/tc_mirred.h
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@@ -8,7 +8,7 @@ struct tcf_mirred {
int tcfm_eaction;
int tcfm_ifindex;
int tcfm_ok_push;
struct net_device *tcfm_dev;
struct net_device __rcu *tcfm_dev;
struct list_head tcfm_list;
};
#define to_mirred(a) \