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openvswitch: Use RCU lock for dp dump operation.

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RCUfy dp-dump operation which is already read-only. This
makes all ovs dump operations lockless.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
This commit is contained in:
Pravin B Shelar 2013-07-30 15:42:19 -07:00 committed by Jesse Gross
parent d57170b1b1
commit 59a35d60af
1 changed files with 7 additions and 6 deletions
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13
net/openvswitch/datapath.c
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@ -951,9 +951,10 @@ static struct genl_ops dp_packet_genl_ops[] = {
static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
{
struct flow_table *table;
int i;
struct flow_table *table = ovsl_dereference(dp->table);
table = rcu_dereference_check(dp->table, lockdep_ovsl_is_held());
stats->n_flows = ovs_flow_tbl_count(table);
stats->n_hit = stats->n_missed = stats->n_lost = 0;
@ -1665,7 +1666,7 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
goto err_destroy_local_port;
ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
list_add_tail(&dp->list_node, &ovs_net->dps);
list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
ovs_unlock();
@ -1703,7 +1704,7 @@ static void __dp_destroy(struct datapath *dp)
ovs_dp_detach_port(vport);
}
list_del(&dp->list_node);
list_del_rcu(&dp->list_node);
/* OVSP_LOCAL is datapath internal port. We need to make sure that
* all port in datapath are destroyed first before freeing datapath.
@ -1808,8 +1809,8 @@ static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
int skip = cb->args[0];
int i = 0;
ovs_lock();
list_for_each_entry(dp, &ovs_net->dps, list_node) {
rcu_read_lock();
list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
if (i >= skip &&
ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
@ -1817,7 +1818,7 @@ static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
break;
i++;
}
ovs_unlock();
rcu_read_unlock();
cb->args[0] = i;