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authorEric Dumazet <edumazet@google.com>2015-07-06 15:18:05 +0300
committerDavid S. Miller <davem@davemloft.net>2015-07-08 23:50:42 +0300
commitcef5ecf96b28dc91c4e9f398a336c578fb9e1a0c (patch)
tree34bf7a7c6ed21b21a2c9a480df00e1e7e3335e11 /net/sched/act_gact.c
parent519c818e8fb646eef1e8bfedd18519bec47bc9a9 (diff)
downloadlinux-cef5ecf96b28dc91c4e9f398a336c578fb9e1a0c.tar.xz
net_sched: act_gact: make tcfg_pval non zero
First step for gact RCU operation : Instead of testing if tcfg_pval is zero or not, just make it 1. No change in behavior, but slightly faster code. The smp_rmb()/smp_wmb() barriers, while not strictly needed at this stage are added for upcoming spinlock removal. Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: 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>
Diffstat (limited to 'net/sched/act_gact.c')
-rw-r--r--net/sched/act_gact.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/net/sched/act_gact.c b/net/sched/act_gact.c
index a4f8af29ee30..22a3a61aa090 100644
--- a/net/sched/act_gact.c
+++ b/net/sched/act_gact.c
@@ -28,14 +28,16 @@
#ifdef CONFIG_GACT_PROB
static int gact_net_rand(struct tcf_gact *gact)
{
- if (!gact->tcfg_pval || prandom_u32() % gact->tcfg_pval)
+ smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
+ if (prandom_u32() % gact->tcfg_pval)
return gact->tcf_action;
return gact->tcfg_paction;
}
static int gact_determ(struct tcf_gact *gact)
{
- if (!gact->tcfg_pval || gact->tcf_bstats.packets % gact->tcfg_pval)
+ smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
+ if (gact->tcf_bstats.packets % gact->tcfg_pval)
return gact->tcf_action;
return gact->tcfg_paction;
}
@@ -105,7 +107,11 @@ static int tcf_gact_init(struct net *net, struct nlattr *nla,
#ifdef CONFIG_GACT_PROB
if (p_parm) {
gact->tcfg_paction = p_parm->paction;
- gact->tcfg_pval = p_parm->pval;
+ gact->tcfg_pval = max_t(u16, 1, p_parm->pval);
+ /* Make sure tcfg_pval is written before tcfg_ptype
+ * coupled with smp_rmb() in gact_net_rand() & gact_determ()
+ */
+ smp_wmb();
gact->tcfg_ptype = p_parm->ptype;
}
#endif