RCUfy dp-dump operation which is already read-only. This
makes all ovs dump operations lockless.
Signed-off-by: Pravin B Shelar <pshe...@nicira.com>
---
v1-v2:
Make dp list RCU-safe.
---
datapath/datapath.c | 13 +++++++------
1 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/datapath/datapath.c b/datapath/datapath.c
index 2f02f71..eb07a89 100644
--- a/datapath/datapath.c
+++ b/datapath/datapath.c
@@ -972,9 +972,10 @@ 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;
@@ -1747,7 +1748,7 @@ 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();
@@ -1785,7 +1786,7 @@ 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.
@@ -1902,8 +1903,8 @@ 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,
@@ -1911,7 +1912,7 @@ 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;
--
1.7.1
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