datapath: Move table destroy to dp-rcu callback.

[sliver-openvswitch.git] / datapath / flow_table.c

diff --git a/datapath/flow_table.c b/datapath/flow_table.c
index 54a2e25..be2d7d5 100644 (file)
--- a/datapath/flow_table.c
+++ b/datapath/flow_table.c
@@ -141,7 +141,7 @@ static void flow_free(struct sw_flow *flow)
 {
        int node;
 
-       kfree((struct sf_flow_acts __force *)flow->sf_acts);
+       kfree((struct sw_flow_actions __force *)flow->sf_acts);
        for_each_node(node)
                if (flow->stats[node])
                        kmem_cache_free(flow_stats_cache,
@@ -168,25 +168,6 @@ void ovs_flow_free(struct sw_flow *flow, bool deferred)
        if (!flow)
                return;
 
-       if (flow->mask) {
-               struct sw_flow_mask *mask = flow->mask;
-
-               /* ovs-lock is required to protect mask-refcount and
-                * mask list.
-                */
-               ASSERT_OVSL();
-               BUG_ON(!mask->ref_count);
-               mask->ref_count--;
-
-               if (!mask->ref_count) {
-                       list_del_rcu(&mask->list);
-                       if (deferred)
-                               call_rcu(&mask->rcu, rcu_free_sw_flow_mask_cb);
-                       else
-                               kfree(mask);
-               }
-       }
-
        if (deferred)
                call_rcu(&flow->rcu, rcu_free_flow_callback);
        else
@@ -278,11 +259,13 @@ skip_flows:
                __table_instance_destroy(ti);
 }
 
-void ovs_flow_tbl_destroy(struct flow_table *table, bool deferred)
+/* No need for locking this function is called from RCU callback or
+ * error path. */
+void ovs_flow_tbl_destroy(struct flow_table *table)
 {
-       struct table_instance *ti = ovsl_dereference(table->ti);
+       struct table_instance *ti = (struct table_instance __force *)table->ti;
 
-       table_instance_destroy(ti, deferred);
+       table_instance_destroy(ti, false);
 }
 
 struct sw_flow *ovs_flow_tbl_dump_next(struct table_instance *ti,
@@ -500,6 +483,25 @@ static struct table_instance *table_instance_expand(struct table_instance *ti)
        return table_instance_rehash(ti, ti->n_buckets * 2);
 }
 
+/* Remove 'mask' from the mask list, if it is not needed any more. */
+static void flow_mask_remove(struct flow_table *tbl, struct sw_flow_mask *mask)
+{
+       if (mask) {
+               /* ovs-lock is required to protect mask-refcount and
+                * mask list.
+                */
+               ASSERT_OVSL();
+               BUG_ON(!mask->ref_count);
+               mask->ref_count--;
+
+               if (!mask->ref_count) {
+                       list_del_rcu(&mask->list);
+                       call_rcu(&mask->rcu, rcu_free_sw_flow_mask_cb);
+               }
+       }
+}
+
+/* Must be called with OVS mutex held. */
 void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow)
 {
        struct table_instance *ti = ovsl_dereference(table->ti);
@@ -507,6 +509,10 @@ void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow)
        BUG_ON(table->count == 0);
        hlist_del_rcu(&flow->hash_node[ti->node_ver]);
        table->count--;
+
+       /* RCU delete the mask. 'flow->mask' is not NULLed, as it should be
+        * accessible as long as the RCU read lock is held. */
+       flow_mask_remove(table, flow->mask);
 }
 
 static struct sw_flow_mask *mask_alloc(void)
@@ -569,6 +575,7 @@ static int flow_mask_insert(struct flow_table *tbl, struct sw_flow *flow,
        return 0;
 }
 
+/* Must be called with OVS mutex held. */
 int ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow,
                        struct sw_flow_mask *mask)
 {