openvswitch: Correctly report flow used times for first 5 minutes after boot.

The kernel starts out its "jiffies" timer as 5 minutes below zero, as
shown in include/linux/jiffies.h:

  /*
   * Have the 32 bit jiffies value wrap 5 minutes after boot
   * so jiffies wrap bugs show up earlier.
   */
  #define INITIAL_JIFFIES ((unsigned long)(unsigned int) (-300*HZ))

The loop in ovs_flow_stats_get() starts out with 'used' set to 0, then
takes any "later" time.  This means that for the first five minutes after
boot, flows will always be reported as never used, since 0 is greater than
any time already seen.

Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>

diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index d71e60fa28cb7b4f634a37c84e8b575c9eedecce..dda451f4429ca4110d614c6b64b00b59908f0ffa 100644 (file)
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -92,7 +92,7 @@ static void stats_read(struct flow_stats *stats,
                       unsigned long *used, __be16 *tcp_flags)
 {
        spin_lock(&stats->lock);
-       if (time_after(stats->used, *used))
+       if (!*used || time_after(stats->used, *used))
                *used = stats->used;
        *tcp_flags |= stats->tcp_flags;
        ovs_stats->n_packets += stats->packet_count;