1 files changed, 89 insertions, 7 deletions

diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index b409f5279601..16f4b46161d4 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -35,6 +35,7 @@
 #include <linux/ip.h>
 #include <linux/ipv6.h>
 #include <linux/sctp.h>
+#include <linux/smp.h>
 #include <linux/tcp.h>
 #include <linux/udp.h>
 #include <linux/icmp.h>
@@ -60,10 +61,16 @@ u64 ovs_flow_used_time(unsigned long flow_jiffies)
 
 #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
 
-void ovs_flow_used(struct sw_flow *flow, struct sk_buff *skb)
+void ovs_flow_stats_update(struct sw_flow *flow, struct sk_buff *skb)
 {
+        struct flow_stats *stats;
         __be16 tcp_flags = 0;
 
+        if (!flow->stats.is_percpu)
+                stats = flow->stats.stat;
+        else
+                stats = this_cpu_ptr(flow->stats.cpu_stats);
+
         if ((flow->key.eth.type == htons(ETH_P_IP) ||
              flow->key.eth.type == htons(ETH_P_IPV6)) &&
             flow->key.ip.proto == IPPROTO_TCP &&
@@ -71,12 +78,87 @@ void ovs_flow_used(struct sw_flow *flow, struct sk_buff *skb)
                 tcp_flags = TCP_FLAGS_BE16(tcp_hdr(skb));
         }
 
-        spin_lock(&flow->lock);
-        flow->used = jiffies;
-        flow->packet_count++;
-        flow->byte_count += skb->len;
-        flow->tcp_flags |= tcp_flags;
-        spin_unlock(&flow->lock);
+        spin_lock(&stats->lock);
+        stats->used = jiffies;
+        stats->packet_count++;
+        stats->byte_count += skb->len;
+        stats->tcp_flags |= tcp_flags;
+        spin_unlock(&stats->lock);
+}
+
+static void stats_read(struct flow_stats *stats,
+                       struct ovs_flow_stats *ovs_stats,
+                       unsigned long *used, __be16 *tcp_flags)
+{
+        spin_lock(&stats->lock);
+        if (time_after(stats->used, *used))
+                *used = stats->used;
+        *tcp_flags |= stats->tcp_flags;
+        ovs_stats->n_packets += stats->packet_count;
+        ovs_stats->n_bytes += stats->byte_count;
+        spin_unlock(&stats->lock);
+}
+
+void ovs_flow_stats_get(struct sw_flow *flow, struct ovs_flow_stats *ovs_stats,
+                        unsigned long *used, __be16 *tcp_flags)
+{
+        int cpu, cur_cpu;
+
+        *used = 0;
+        *tcp_flags = 0;
+        memset(ovs_stats, 0, sizeof(*ovs_stats));
+
+        if (!flow->stats.is_percpu) {
+                stats_read(flow->stats.stat, ovs_stats, used, tcp_flags);
+        } else {
+                cur_cpu = get_cpu();
+                for_each_possible_cpu(cpu) {
+                        struct flow_stats *stats;
+
+                        if (cpu == cur_cpu)
+                                local_bh_disable();
+
+                        stats = per_cpu_ptr(flow->stats.cpu_stats, cpu);
+                        stats_read(stats, ovs_stats, used, tcp_flags);
+
+                        if (cpu == cur_cpu)
+                                local_bh_enable();
+                }
+                put_cpu();
+        }
+}
+
+static void stats_reset(struct flow_stats *stats)
+{
+        spin_lock(&stats->lock);
+        stats->used = 0;
+        stats->packet_count = 0;
+        stats->byte_count = 0;
+        stats->tcp_flags = 0;
+        spin_unlock(&stats->lock);
+}
+
+void ovs_flow_stats_clear(struct sw_flow *flow)
+{
+        int cpu, cur_cpu;
+
+        if (!flow->stats.is_percpu) {
+                stats_reset(flow->stats.stat);
+        } else {
+                cur_cpu = get_cpu();
+
+                for_each_possible_cpu(cpu) {
+
+                        if (cpu == cur_cpu)
+                                local_bh_disable();
+
+                        stats_reset(per_cpu_ptr(flow->stats.cpu_stats, cpu));
+
+                        if (cpu == cur_cpu)
+                                local_bh_enable();
+                }
+                put_cpu();
+        }
 }
 
 static int check_header(struct sk_buff *skb, int len)