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net_sched: act_gact: use a separate packet counters for gact_determ()
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>
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2 changed files with 7 additions and 4 deletions
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@ -9,6 +9,7 @@ struct tcf_gact {
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u16 tcfg_ptype;
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u16 tcfg_ptype;
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u16 tcfg_pval;
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u16 tcfg_pval;
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int tcfg_paction;
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int tcfg_paction;
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atomic_t packets;
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#endif
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#endif
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};
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};
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#define to_gact(a) \
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#define to_gact(a) \
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@ -36,8 +36,10 @@ static int gact_net_rand(struct tcf_gact *gact)
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static int gact_determ(struct tcf_gact *gact)
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static int gact_determ(struct tcf_gact *gact)
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{
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{
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u32 pack = atomic_inc_return(&gact->packets);
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smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
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smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
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if (gact->tcf_bstats.packets % gact->tcfg_pval)
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if (pack % gact->tcfg_pval)
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return gact->tcf_action;
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return gact->tcf_action;
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return gact->tcfg_paction;
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return gact->tcfg_paction;
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}
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}
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