VXLAN: Fix vxlan stats handling.

Fixes bug in VXLAN code where is iptunnel_xmit() called with NULL
dev->tstats.
This bug was introduced in commit 6aed0c8bf7d2f389b (tunnel: use
iptunnel_xmit() again).

Following patch fixes bug by setting dev->tstats. It uses ip_tunnel
module code to share stats function.

CC: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 65 deletions

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index fe9ea7d14951..e532b2ab5b0f 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -101,20 +101,10 @@ struct vxlan_fdb {
         u8                eth_addr[ETH_ALEN];
 };
 
-/* Per-cpu network traffic stats */
-struct vxlan_stats {
-        u64                     rx_packets;
-        u64                     rx_bytes;
-        u64                     tx_packets;
-        u64                     tx_bytes;
-        struct u64_stats_sync   syncp;
-};
-
 /* Pseudo network device */
 struct vxlan_dev {
         struct hlist_node hlist;
         struct net_device *dev;
-        struct vxlan_stats __percpu *stats;
         __u32             vni;          /* virtual network id */
         __be32            gaddr;        /* multicast group */
         __be32            saddr;        /* source address */
@@ -667,7 +657,7 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
         struct iphdr *oip;
         struct vxlanhdr *vxh;
         struct vxlan_dev *vxlan;
-        struct vxlan_stats *stats;
+        struct pcpu_tstats *stats;
         __u32 vni;
         int err;
 
@@ -743,7 +733,7 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
                 }
         }
 
-        stats = this_cpu_ptr(vxlan->stats);
+        stats = this_cpu_ptr(vxlan->dev->tstats);
         u64_stats_update_begin(&stats->syncp);
         stats->rx_packets++;
         stats->rx_bytes += skb->len;
@@ -974,8 +964,7 @@ static netdev_tx_t vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 
                         /* short-circuited back to local bridge */
                         if (netif_rx(skb) == NET_RX_SUCCESS) {
-                                struct vxlan_stats *stats =
-                                                this_cpu_ptr(vxlan->stats);
+                                struct pcpu_tstats *stats = this_cpu_ptr(dev->tstats);
 
                                 u64_stats_update_begin(&stats->syncp);
                                 stats->tx_packets++;
@@ -1183,10 +1172,8 @@ static void vxlan_cleanup(unsigned long arg)
 /* Setup stats when device is created */
 static int vxlan_init(struct net_device *dev)
 {
-        struct vxlan_dev *vxlan = netdev_priv(dev);
-
-        vxlan->stats = alloc_percpu(struct vxlan_stats);
-        if (!vxlan->stats)
+        dev->tstats = alloc_percpu(struct pcpu_tstats);
+        if (!dev->tstats)
                 return -ENOMEM;
 
         return 0;
@@ -1242,49 +1229,6 @@ static int vxlan_stop(struct net_device *dev)
         return 0;
 }
 
-/* Merge per-cpu statistics */
-static struct rtnl_link_stats64 *vxlan_stats64(struct net_device *dev,
-                                               struct rtnl_link_stats64 *stats)
-{
-        struct vxlan_dev *vxlan = netdev_priv(dev);
-        struct vxlan_stats tmp, sum = { 0 };
-        unsigned int cpu;
-
-        for_each_possible_cpu(cpu) {
-                unsigned int start;
-                const struct vxlan_stats *stats
-                        = per_cpu_ptr(vxlan->stats, cpu);
-
-                do {
-                        start = u64_stats_fetch_begin_bh(&stats->syncp);
-                        memcpy(&tmp, stats, sizeof(tmp));
-                } while (u64_stats_fetch_retry_bh(&stats->syncp, start));
-
-                sum.tx_bytes   += tmp.tx_bytes;
-                sum.tx_packets += tmp.tx_packets;
-                sum.rx_bytes   += tmp.rx_bytes;
-                sum.rx_packets += tmp.rx_packets;
-        }
-
-        stats->tx_bytes   = sum.tx_bytes;
-        stats->tx_packets = sum.tx_packets;
-        stats->rx_bytes   = sum.rx_bytes;
-        stats->rx_packets = sum.rx_packets;
-
-        stats->multicast = dev->stats.multicast;
-        stats->rx_length_errors = dev->stats.rx_length_errors;
-        stats->rx_frame_errors = dev->stats.rx_frame_errors;
-        stats->rx_errors = dev->stats.rx_errors;
-
-        stats->tx_dropped = dev->stats.tx_dropped;
-        stats->tx_carrier_errors  = dev->stats.tx_carrier_errors;
-        stats->tx_aborted_errors  = dev->stats.tx_aborted_errors;
-        stats->collisions  = dev->stats.collisions;
-        stats->tx_errors = dev->stats.tx_errors;
-
-        return stats;
-}
-
 /* Stub, nothing needs to be done. */
 static void vxlan_set_multicast_list(struct net_device *dev)
 {
@@ -1295,7 +1239,7 @@ static const struct net_device_ops vxlan_netdev_ops = {
         .ndo_open               = vxlan_open,
         .ndo_stop               = vxlan_stop,
         .ndo_start_xmit         = vxlan_xmit,
-        .ndo_get_stats64        = vxlan_stats64,
+        .ndo_get_stats64        = ip_tunnel_get_stats64,
         .ndo_set_rx_mode        = vxlan_set_multicast_list,
         .ndo_change_mtu         = eth_change_mtu,
         .ndo_validate_addr      = eth_validate_addr,
@@ -1312,9 +1256,7 @@ static struct device_type vxlan_type = {
 
 static void vxlan_free(struct net_device *dev)
 {
-        struct vxlan_dev *vxlan = netdev_priv(dev);
-
-        free_percpu(vxlan->stats);
+        free_percpu(dev->tstats);
         free_netdev(dev);
 }