openvswitch: collect mega flow mask stats

Collect mega flow mask stats. ovs-dpctl show command can be used to
display them for debugging and performance tuning.

Signed-off-by: Andy Zhou <azhou@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>

1 files changed, 15 insertions, 1 deletions

diff --git a/net/openvswitch/flow_table.c b/net/openvswitch/flow_table.c
index 036e019..536b4d2 100644
--- a/net/openvswitch/flow_table.c
+++ b/net/openvswitch/flow_table.c
@@ -430,13 +430,16 @@ static struct sw_flow *masked_flow_lookup(struct table_instance *ti,
 }
 
 struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *tbl,
-				    const struct sw_flow_key *key)
+				    const struct sw_flow_key *key,
+				    u32 *n_mask_hit)
 {
 	struct table_instance *ti = rcu_dereference(tbl->ti);
 	struct sw_flow_mask *mask;
 	struct sw_flow *flow;
 
+	*n_mask_hit = 0;
 	list_for_each_entry_rcu(mask, &tbl->mask_list, list) {
+		(*n_mask_hit)++;
 		flow = masked_flow_lookup(ti, key, mask);
 		if (flow)  /* Found */
 			return flow;
@@ -444,6 +447,17 @@ struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *tbl,
 	return NULL;
 }
 
+int ovs_flow_tbl_num_masks(const struct flow_table *table)
+{
+	struct sw_flow_mask *mask;
+	int num = 0;
+
+	list_for_each_entry(mask, &table->mask_list, list)
+		num++;
+
+	return num;
+}
+
 static struct table_instance *table_instance_expand(struct table_instance *ti)
 {
 	return table_instance_rehash(ti, ti->n_buckets * 2);