tunnel: implement 64 bits statistics

Convert the per-cpu statistics kept for GRE, IPIP, and SIT tunnels
to use 64 bit statistics.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 40 insertions, 19 deletions

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 02d07c6..b9abf26 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -169,30 +169,49 @@ struct ipgre_net {
 
 /* often modified stats are per cpu, other are shared (netdev->stats) */
 struct pcpu_tstats {
-	unsigned long	rx_packets;
-	unsigned long	rx_bytes;
-	unsigned long	tx_packets;
-	unsigned long	tx_bytes;
-} __attribute__((aligned(4*sizeof(unsigned long))));
+	u64	rx_packets;
+	u64	rx_bytes;
+	u64	tx_packets;
+	u64	tx_bytes;
+	struct u64_stats_sync	syncp;
+};
 
-static struct net_device_stats *ipgre_get_stats(struct net_device *dev)
+static struct rtnl_link_stats64 *ipgre_get_stats64(struct net_device *dev,
+						   struct rtnl_link_stats64 *tot)
 {
-	struct pcpu_tstats sum = { 0 };
 	int i;
 
 	for_each_possible_cpu(i) {
 		const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
-
-		sum.rx_packets += tstats->rx_packets;
-		sum.rx_bytes   += tstats->rx_bytes;
-		sum.tx_packets += tstats->tx_packets;
-		sum.tx_bytes   += tstats->tx_bytes;
+		u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
+		unsigned int start;
+
+		do {
+			start = u64_stats_fetch_begin_bh(&tstats->syncp);
+			rx_packets = tstats->rx_packets;
+			tx_packets = tstats->tx_packets;
+			rx_bytes = tstats->rx_bytes;
+			tx_bytes = tstats->tx_bytes;
+		} while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
+
+		tot->rx_packets += rx_packets;
+		tot->tx_packets += tx_packets;
+		tot->rx_bytes   += rx_bytes;
+		tot->tx_bytes   += tx_bytes;
 	}
-	dev->stats.rx_packets = sum.rx_packets;
-	dev->stats.rx_bytes   = sum.rx_bytes;
-	dev->stats.tx_packets = sum.tx_packets;
-	dev->stats.tx_bytes   = sum.tx_bytes;
-	return &dev->stats;
+
+	tot->multicast = dev->stats.multicast;
+	tot->rx_crc_errors = dev->stats.rx_crc_errors;
+	tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
+	tot->rx_length_errors = dev->stats.rx_length_errors;
+	tot->rx_errors = dev->stats.rx_errors;
+	tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
+	tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
+	tot->tx_dropped = dev->stats.tx_dropped;
+	tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
+	tot->tx_errors = dev->stats.tx_errors;
+
+	return tot;
 }
 
 /* Given src, dst and key, find appropriate for input tunnel. */
@@ -672,8 +691,10 @@ static int ipgre_rcv(struct sk_buff *skb)
 		}
 
 		tstats = this_cpu_ptr(tunnel->dev->tstats);
+		u64_stats_update_begin(&tstats->syncp);
 		tstats->rx_packets++;
 		tstats->rx_bytes += skb->len;
+		u64_stats_update_end(&tstats->syncp);
 
 		__skb_tunnel_rx(skb, tunnel->dev);
 
@@ -1253,7 +1274,7 @@ static const struct net_device_ops ipgre_netdev_ops = {
 	.ndo_start_xmit		= ipgre_tunnel_xmit,
 	.ndo_do_ioctl		= ipgre_tunnel_ioctl,
 	.ndo_change_mtu		= ipgre_tunnel_change_mtu,
-	.ndo_get_stats		= ipgre_get_stats,
+	.ndo_get_stats64	= ipgre_get_stats64,
 };
 
 static void ipgre_dev_free(struct net_device *dev)
@@ -1507,7 +1528,7 @@ static const struct net_device_ops ipgre_tap_netdev_ops = {
 	.ndo_set_mac_address 	= eth_mac_addr,
 	.ndo_validate_addr	= eth_validate_addr,
 	.ndo_change_mtu		= ipgre_tunnel_change_mtu,
-	.ndo_get_stats		= ipgre_get_stats,
+	.ndo_get_stats64	= ipgre_get_stats64,
 };
 
 static void ipgre_tap_setup(struct net_device *dev)