ipvs: Embed user stats structure into kernel stats structure

Instead of duplicating the fields, integrate a user stats structure into
the kernel stats structure. This is more robust when the members are
changed, because they are now automatically kept in sync.
Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
Reviewed-by: Julius Volz <juliusv@google.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

include/net/ip_vs.h

@@ -254,27 +254,10 @@ struct ip_vs_estimator {
 
 struct ip_vs_stats
 {
-	__u32                   conns;          /* connections scheduled */
-	__u32                   inpkts;         /* incoming packets */
-	__u32                   outpkts;        /* outgoing packets */
-	__u64                   inbytes;        /* incoming bytes */
-	__u64                   outbytes;       /* outgoing bytes */
-
-	__u32			cps;		/* current connection rate */
-	__u32			inpps;		/* current in packet rate */
-	__u32			outpps;		/* current out packet rate */
-	__u32			inbps;		/* current in byte rate */
-	__u32			outbps;		/* current out byte rate */
-
-	/*
-	 * Don't add anything before the lock, because we use memcpy() to copy
-	 * the members before the lock to struct ip_vs_stats_user in
-	 * ip_vs_ctl.c.
-	 */
+	struct ip_vs_stats_user	ustats;         /* statistics */
+	struct ip_vs_estimator	est;		/* estimator */
 
 	spinlock_t              lock;           /* spin lock */
-
-	struct ip_vs_estimator	est;		/* estimator */
 };
 
 struct dst_entry;

net/ipv4/ipvs/ip_vs_core.c

@@ -102,18 +102,18 @@ ip_vs_in_stats(struct ip_vs_conn *cp, struct sk_buff *skb)
 	struct ip_vs_dest *dest = cp->dest;
 	if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) {
 		spin_lock(&dest->stats.lock);
-		dest->stats.inpkts++;
-		dest->stats.inbytes += skb->len;
+		dest->stats.ustats.inpkts++;
+		dest->stats.ustats.inbytes += skb->len;
 		spin_unlock(&dest->stats.lock);
 
 		spin_lock(&dest->svc->stats.lock);
-		dest->svc->stats.inpkts++;
-		dest->svc->stats.inbytes += skb->len;
+		dest->svc->stats.ustats.inpkts++;
+		dest->svc->stats.ustats.inbytes += skb->len;
 		spin_unlock(&dest->svc->stats.lock);
 
 		spin_lock(&ip_vs_stats.lock);
-		ip_vs_stats.inpkts++;
-		ip_vs_stats.inbytes += skb->len;
+		ip_vs_stats.ustats.inpkts++;
+		ip_vs_stats.ustats.inbytes += skb->len;
 		spin_unlock(&ip_vs_stats.lock);
 	}
 }
@@ -125,18 +125,18 @@ ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb)
 	struct ip_vs_dest *dest = cp->dest;
 	if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) {
 		spin_lock(&dest->stats.lock);
-		dest->stats.outpkts++;
-		dest->stats.outbytes += skb->len;
+		dest->stats.ustats.outpkts++;
+		dest->stats.ustats.outbytes += skb->len;
 		spin_unlock(&dest->stats.lock);
 
 		spin_lock(&dest->svc->stats.lock);
-		dest->svc->stats.outpkts++;
-		dest->svc->stats.outbytes += skb->len;
+		dest->svc->stats.ustats.outpkts++;
+		dest->svc->stats.ustats.outbytes += skb->len;
 		spin_unlock(&dest->svc->stats.lock);
 
 		spin_lock(&ip_vs_stats.lock);
-		ip_vs_stats.outpkts++;
-		ip_vs_stats.outbytes += skb->len;
+		ip_vs_stats.ustats.outpkts++;
+		ip_vs_stats.ustats.outbytes += skb->len;
 		spin_unlock(&ip_vs_stats.lock);
 	}
 }
@@ -146,15 +146,15 @@ static inline void
 ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc)
 {
 	spin_lock(&cp->dest->stats.lock);
-	cp->dest->stats.conns++;
+	cp->dest->stats.ustats.conns++;
 	spin_unlock(&cp->dest->stats.lock);
 
 	spin_lock(&svc->stats.lock);
-	svc->stats.conns++;
+	svc->stats.ustats.conns++;
 	spin_unlock(&svc->stats.lock);
 
 	spin_lock(&ip_vs_stats.lock);
-	ip_vs_stats.conns++;
+	ip_vs_stats.ustats.conns++;
 	spin_unlock(&ip_vs_stats.lock);
 }
 

net/ipv4/ipvs/ip_vs_ctl.c

@@ -744,18 +744,7 @@ ip_vs_zero_stats(struct ip_vs_stats *stats)
 {
 	spin_lock_bh(&stats->lock);
 
-	stats->conns = 0;
-	stats->inpkts = 0;
-	stats->outpkts = 0;
-	stats->inbytes = 0;
-	stats->outbytes = 0;
-
-	stats->cps = 0;
-	stats->inpps = 0;
-	stats->outpps = 0;
-	stats->inbps = 0;
-	stats->outbps = 0;
-
+	memset(&stats->ustats, 0, sizeof(stats->ustats));
 	ip_vs_zero_estimator(stats);
 
 	spin_unlock_bh(&stats->lock);
@@ -1964,20 +1953,20 @@ static int ip_vs_stats_show(struct seq_file *seq, void *v)
 		   "   Conns  Packets  Packets            Bytes            Bytes\n");
 
 	spin_lock_bh(&ip_vs_stats.lock);
-	seq_printf(seq, "%8X %8X %8X %16LX %16LX\n\n", ip_vs_stats.conns,
-		   ip_vs_stats.inpkts, ip_vs_stats.outpkts,
-		   (unsigned long long) ip_vs_stats.inbytes,
-		   (unsigned long long) ip_vs_stats.outbytes);
+	seq_printf(seq, "%8X %8X %8X %16LX %16LX\n\n", ip_vs_stats.ustats.conns,
+		   ip_vs_stats.ustats.inpkts, ip_vs_stats.ustats.outpkts,
+		   (unsigned long long) ip_vs_stats.ustats.inbytes,
+		   (unsigned long long) ip_vs_stats.ustats.outbytes);
 
 /*                 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",
-			ip_vs_stats.cps,
-			ip_vs_stats.inpps,
-			ip_vs_stats.outpps,
-			ip_vs_stats.inbps,
-			ip_vs_stats.outbps);
+			ip_vs_stats.ustats.cps,
+			ip_vs_stats.ustats.inpps,
+			ip_vs_stats.ustats.outpps,
+			ip_vs_stats.ustats.inbps,
+			ip_vs_stats.ustats.outbps);
 	spin_unlock_bh(&ip_vs_stats.lock);
 
 	return 0;
@@ -2215,7 +2204,7 @@ static void
 ip_vs_copy_stats(struct ip_vs_stats_user *dst, struct ip_vs_stats *src)
 {
 	spin_lock_bh(&src->lock);
-	memcpy(dst, src, (char*)&src->lock - (char*)src);
+	memcpy(dst, &src->ustats, sizeof(*dst));
 	spin_unlock_bh(&src->lock);
 }
 
@@ -2591,16 +2580,16 @@ static int ip_vs_genl_fill_stats(struct sk_buff *skb, int container_type,
 
 	spin_lock_bh(&stats->lock);
 
-	NLA_PUT_U32(skb, IPVS_STATS_ATTR_CONNS, stats->conns);
-	NLA_PUT_U32(skb, IPVS_STATS_ATTR_INPKTS, stats->inpkts);
-	NLA_PUT_U32(skb, IPVS_STATS_ATTR_OUTPKTS, stats->outpkts);
-	NLA_PUT_U64(skb, IPVS_STATS_ATTR_INBYTES, stats->inbytes);
-	NLA_PUT_U64(skb, IPVS_STATS_ATTR_OUTBYTES, stats->outbytes);
-	NLA_PUT_U32(skb, IPVS_STATS_ATTR_CPS, stats->cps);
-	NLA_PUT_U32(skb, IPVS_STATS_ATTR_INPPS, stats->inpps);
-	NLA_PUT_U32(skb, IPVS_STATS_ATTR_OUTPPS, stats->outpps);
-	NLA_PUT_U32(skb, IPVS_STATS_ATTR_INBPS, stats->inbps);
-	NLA_PUT_U32(skb, IPVS_STATS_ATTR_OUTBPS, stats->outbps);
+	NLA_PUT_U32(skb, IPVS_STATS_ATTR_CONNS, stats->ustats.conns);
+	NLA_PUT_U32(skb, IPVS_STATS_ATTR_INPKTS, stats->ustats.inpkts);
+	NLA_PUT_U32(skb, IPVS_STATS_ATTR_OUTPKTS, stats->ustats.outpkts);
+	NLA_PUT_U64(skb, IPVS_STATS_ATTR_INBYTES, stats->ustats.inbytes);
+	NLA_PUT_U64(skb, IPVS_STATS_ATTR_OUTBYTES, stats->ustats.outbytes);
+	NLA_PUT_U32(skb, IPVS_STATS_ATTR_CPS, stats->ustats.cps);
+	NLA_PUT_U32(skb, IPVS_STATS_ATTR_INPPS, stats->ustats.inpps);
+	NLA_PUT_U32(skb, IPVS_STATS_ATTR_OUTPPS, stats->ustats.outpps);
+	NLA_PUT_U32(skb, IPVS_STATS_ATTR_INBPS, stats->ustats.inbps);
+	NLA_PUT_U32(skb, IPVS_STATS_ATTR_OUTBPS, stats->ustats.outbps);
 
 	spin_unlock_bh(&stats->lock);
 

net/ipv4/ipvs/ip_vs_est.c

@@ -65,37 +65,37 @@ static void estimation_timer(unsigned long arg)
 		s = container_of(e, struct ip_vs_stats, est);
 
 		spin_lock(&s->lock);
-		n_conns = s->conns;
-		n_inpkts = s->inpkts;
-		n_outpkts = s->outpkts;
-		n_inbytes = s->inbytes;
-		n_outbytes = s->outbytes;
+		n_conns = s->ustats.conns;
+		n_inpkts = s->ustats.inpkts;
+		n_outpkts = s->ustats.outpkts;
+		n_inbytes = s->ustats.inbytes;
+		n_outbytes = s->ustats.outbytes;
 
 		/* scaled by 2^10, but divided 2 seconds */
 		rate = (n_conns - e->last_conns)<<9;
 		e->last_conns = n_conns;
 		e->cps += ((long)rate - (long)e->cps)>>2;
-		s->cps = (e->cps+0x1FF)>>10;
+		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->inpps = (e->inpps+0x1FF)>>10;
+		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->outpps = (e->outpps+0x1FF)>>10;
+		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->inbps = (e->inbps+0xF)>>5;
+		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->outbps = (e->outbps+0xF)>>5;
+		s->ustats.outbps = (e->outbps+0xF)>>5;
 		spin_unlock(&s->lock);
 	}
 	spin_unlock(&est_lock);
@@ -108,20 +108,20 @@ void ip_vs_new_estimator(struct ip_vs_stats *stats)
 
 	INIT_LIST_HEAD(&est->list);
 
-	est->last_conns = stats->conns;
-	est->cps = stats->cps<<10;
+	est->last_conns = stats->ustats.conns;
+	est->cps = stats->ustats.cps<<10;
 
-	est->last_inpkts = stats->inpkts;
-	est->inpps = stats->inpps<<10;
+	est->last_inpkts = stats->ustats.inpkts;
+	est->inpps = stats->ustats.inpps<<10;
 
-	est->last_outpkts = stats->outpkts;
-	est->outpps = stats->outpps<<10;
+	est->last_outpkts = stats->ustats.outpkts;
+	est->outpps = stats->ustats.outpps<<10;
 
-	est->last_inbytes = stats->inbytes;
-	est->inbps = stats->inbps<<5;
+	est->last_inbytes = stats->ustats.inbytes;
+	est->inbps = stats->ustats.inbps<<5;
 
-	est->last_outbytes = stats->outbytes;
-	est->outbps = stats->outbps<<5;
+	est->last_outbytes = stats->ustats.outbytes;
+	est->outbps = stats->ustats.outbps<<5;
 
 	spin_lock_bh(&est_lock);
 	list_add(&est->list, &est_list);