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net_sched: act_gact: use a separate packet counters for gact_determ()

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Second step for gact RCU operation :

We want to get rid of the spinlock protecting gact operations.
Stats (packets/bytes) will soon be per cpu.

gact_determ() would not work without a central packet counter,
so lets add it for this mode.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-07-06 05:18:06 -07:00 committed by David S. Miller
parent cef5ecf96b
commit cc6510a950
2 changed files with 7 additions and 4 deletions
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7
include/net/tc_act/tc_gact.h
View File

@ -6,9 +6,10 @@
struct tcf_gact {
struct tcf_common common;
#ifdef CONFIG_GACT_PROB
u16 tcfg_ptype;
u16 tcfg_pval;
int tcfg_paction;
u16 tcfg_ptype;
u16 tcfg_pval;
int tcfg_paction;
atomic_t packets;
#endif
};
#define to_gact(a) \

4
net/sched/act_gact.c
View File

@ -36,8 +36,10 @@ static int gact_net_rand(struct tcf_gact *gact)
static int gact_determ(struct tcf_gact *gact)
{
u32 pack = atomic_inc_return(&gact->packets);
smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
if (gact->tcf_bstats.packets % gact->tcfg_pval)
if (pack % gact->tcfg_pval)
return gact->tcf_action;
return gact->tcfg_paction;
}