ipvs: optimize rates reading

 	Move the estimator reading from estimation_timer to user
context. ip_vs_read_estimator() will be used to decode the rate
values. As the decoded rates are not set by estimation timer
there is no need to reset them in ip_vs_zero_stats.

 	There is no need ip_vs_new_estimator() to encode stats
to rates, if the destination is in trash both the stats and the
rates are inactive.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>

include/net/ip_vs.h

@@ -1179,6 +1179,8 @@ extern void ip_vs_estimator_cleanup(void);
 extern void ip_vs_new_estimator(struct net *net, struct ip_vs_stats *stats);
 extern void ip_vs_kill_estimator(struct net *net, struct ip_vs_stats *stats);
 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
+extern void ip_vs_read_estimator(struct ip_vs_stats_user *dst,
+				 struct ip_vs_stats *stats);
 
 /*
  *	Various IPVS packet transmitters (from ip_vs_xmit.c)

net/netfilter/ipvs/ip_vs_ctl.c

@@ -715,7 +715,6 @@ static void
 ip_vs_copy_stats(struct ip_vs_stats_user *dst, struct ip_vs_stats *src)
 {
 #define IP_VS_SHOW_STATS_COUNTER(c) dst->c = src->ustats.c - src->ustats0.c
-#define IP_VS_SHOW_STATS_RATE(r) dst->r = src->ustats.r
 
 	spin_lock_bh(&src->lock);
 
@@ -725,11 +724,7 @@ ip_vs_copy_stats(struct ip_vs_stats_user *dst, struct ip_vs_stats *src)
 	IP_VS_SHOW_STATS_COUNTER(inbytes);
 	IP_VS_SHOW_STATS_COUNTER(outbytes);
 
-	IP_VS_SHOW_STATS_RATE(cps);
-	IP_VS_SHOW_STATS_RATE(inpps);
-	IP_VS_SHOW_STATS_RATE(outpps);
-	IP_VS_SHOW_STATS_RATE(inbps);
-	IP_VS_SHOW_STATS_RATE(outbps);
+	ip_vs_read_estimator(dst, src);
 
 	spin_unlock_bh(&src->lock);
 }
@@ -742,7 +737,6 @@ ip_vs_zero_stats(struct ip_vs_stats *stats)
 	/* get current counters as zero point, rates are zeroed */
 
 #define IP_VS_ZERO_STATS_COUNTER(c) stats->ustats0.c = stats->ustats.c
-#define IP_VS_ZERO_STATS_RATE(r) stats->ustats.r = 0
 
 	IP_VS_ZERO_STATS_COUNTER(conns);
 	IP_VS_ZERO_STATS_COUNTER(inpkts);
@@ -750,12 +744,6 @@ ip_vs_zero_stats(struct ip_vs_stats *stats)
 	IP_VS_ZERO_STATS_COUNTER(inbytes);
 	IP_VS_ZERO_STATS_COUNTER(outbytes);
 
-	IP_VS_ZERO_STATS_RATE(cps);
-	IP_VS_ZERO_STATS_RATE(inpps);
-	IP_VS_ZERO_STATS_RATE(outpps);
-	IP_VS_ZERO_STATS_RATE(inbps);
-	IP_VS_ZERO_STATS_RATE(outbps);
-
 	ip_vs_zero_estimator(stats);
 
 	spin_unlock_bh(&stats->lock);
@@ -2043,6 +2031,7 @@ static int ip_vs_stats_percpu_show(struct seq_file *seq, void *v)
 	struct net *net = seq_file_single_net(seq);
 	struct ip_vs_stats *tot_stats = &net_ipvs(net)->tot_stats;
 	struct ip_vs_cpu_stats *cpustats = tot_stats->cpustats;
+	struct ip_vs_stats_user rates;
 	int i;
 
 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
@@ -2069,22 +2058,26 @@ static int ip_vs_stats_percpu_show(struct seq_file *seq, void *v)
 	}
 
 	spin_lock_bh(&tot_stats->lock);
+
 	seq_printf(seq, "  ~ %8X %8X %8X %16LX %16LX\n\n",
 		   tot_stats->ustats.conns, tot_stats->ustats.inpkts,
 		   tot_stats->ustats.outpkts,
 		   (unsigned long long) tot_stats->ustats.inbytes,
 		   (unsigned long long) tot_stats->ustats.outbytes);
 
+	ip_vs_read_estimator(&rates, tot_stats);
+
+	spin_unlock_bh(&tot_stats->lock);
+
 /*                 01234567 01234567 01234567 0123456701234567 0123456701234567 */
 	seq_puts(seq,
 		   "     Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
 	seq_printf(seq, "    %8X %8X %8X %16X %16X\n",
-			tot_stats->ustats.cps,
-			tot_stats->ustats.inpps,
-			tot_stats->ustats.outpps,
-			tot_stats->ustats.inbps,
-			tot_stats->ustats.outbps);
-	spin_unlock_bh(&tot_stats->lock);
+			rates.cps,
+			rates.inpps,
+			rates.outpps,
+			rates.inbps,
+			rates.outbps);
 
 	return 0;
 }

net/netfilter/ipvs/ip_vs_est.c

@@ -117,27 +117,22 @@ static void estimation_timer(unsigned long arg)
 		rate = (n_conns - e->last_conns) << 9;
 		e->last_conns = n_conns;
 		e->cps += ((long)rate - (long)e->cps) >> 2;
-		s->ustats.cps = (e->cps + 0x1FF) >> 10;
 
 		rate = (n_inpkts - e->last_inpkts) << 9;
 		e->last_inpkts = n_inpkts;
 		e->inpps += ((long)rate - (long)e->inpps) >> 2;
-		s->ustats.inpps = (e->inpps + 0x1FF) >> 10;
 
 		rate = (n_outpkts - e->last_outpkts) << 9;
 		e->last_outpkts = n_outpkts;
 		e->outpps += ((long)rate - (long)e->outpps) >> 2;
-		s->ustats.outpps = (e->outpps + 0x1FF) >> 10;
 
 		rate = (n_inbytes - e->last_inbytes) << 4;
 		e->last_inbytes = n_inbytes;
 		e->inbps += ((long)rate - (long)e->inbps) >> 2;
-		s->ustats.inbps = (e->inbps + 0xF) >> 5;
 
 		rate = (n_outbytes - e->last_outbytes) << 4;
 		e->last_outbytes = n_outbytes;
 		e->outbps += ((long)rate - (long)e->outbps) >> 2;
-		s->ustats.outbps = (e->outbps + 0xF) >> 5;
 		spin_unlock(&s->lock);
 	}
 	spin_unlock(&ipvs->est_lock);
@@ -151,21 +146,6 @@ void ip_vs_new_estimator(struct net *net, struct ip_vs_stats *stats)
 
 	INIT_LIST_HEAD(&est->list);
 
-	est->last_conns = stats->ustats.conns;
-	est->cps = stats->ustats.cps<<10;
-
-	est->last_inpkts = stats->ustats.inpkts;
-	est->inpps = stats->ustats.inpps<<10;
-
-	est->last_outpkts = stats->ustats.outpkts;
-	est->outpps = stats->ustats.outpps<<10;
-
-	est->last_inbytes = stats->ustats.inbytes;
-	est->inbps = stats->ustats.inbps<<5;
-
-	est->last_outbytes = stats->ustats.outbytes;
-	est->outbps = stats->ustats.outbps<<5;
-
 	spin_lock_bh(&ipvs->est_lock);
 	list_add(&est->list, &ipvs->est_list);
 	spin_unlock_bh(&ipvs->est_lock);
@@ -199,6 +179,19 @@ void ip_vs_zero_estimator(struct ip_vs_stats *stats)
 	est->outbps = 0;
 }
 
+/* Get decoded rates */
+void ip_vs_read_estimator(struct ip_vs_stats_user *dst,
+			  struct ip_vs_stats *stats)
+{
+	struct ip_vs_estimator *e = &stats->est;
+
+	dst->cps = (e->cps + 0x1FF) >> 10;
+	dst->inpps = (e->inpps + 0x1FF) >> 10;
+	dst->outpps = (e->outpps + 0x1FF) >> 10;
+	dst->inbps = (e->inbps + 0xF) >> 5;
+	dst->outbps = (e->outbps + 0xF) >> 5;
+}
+
 static int __net_init __ip_vs_estimator_init(struct net *net)
 {
 	struct netns_ipvs *ipvs = net_ipvs(net);