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authorPravin B Shelar <pshelar@nicira.com>2013-07-30 15:39:39 -0700
committerJesse Gross <jesse@nicira.com>2013-08-23 16:37:59 -0700
commitd57170b1b1d71382a0d9cf31b01364a97add3f19 (patch)
tree7d8ce91219303f31fa7e08ab22c0735580cfcde3 /net/openvswitch
parent2771399ac9986c75437a83b1c723493cfcdfa439 (diff)
openvswitch: Use RCU lock for flow dump operation.
Flow dump operation is read-only operation. There is no need to take ovs-lock. Following patch use rcu-lock for dumping flows. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: Jesse Gross <jesse@nicira.com>
Diffstat (limited to 'net/openvswitch')
-rw-r--r--net/openvswitch/datapath.c17
1 files changed, 9 insertions, 8 deletions
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index f2ed7600084..e6fb866e4ed 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -1104,7 +1104,6 @@ static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
u32 seq, u32 flags, u8 cmd)
{
const int skb_orig_len = skb->len;
- const struct sw_flow_actions *sf_acts;
struct nlattr *start;
struct ovs_flow_stats stats;
struct ovs_header *ovs_header;
@@ -1113,8 +1112,6 @@ static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
u8 tcp_flags;
int err;
- sf_acts = ovsl_dereference(flow->sf_acts);
-
ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
if (!ovs_header)
return -EMSGSIZE;
@@ -1161,6 +1158,11 @@ static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
*/
start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
if (start) {
+ const struct sw_flow_actions *sf_acts;
+
+ sf_acts = rcu_dereference_check(flow->sf_acts,
+ lockdep_ovsl_is_held());
+
err = actions_to_attr(sf_acts->actions, sf_acts->actions_len, skb);
if (!err)
nla_nest_end(skb, start);
@@ -1440,15 +1442,14 @@ static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
struct datapath *dp;
struct flow_table *table;
- ovs_lock();
+ rcu_read_lock();
dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
if (!dp) {
- ovs_unlock();
+ rcu_read_unlock();
return -ENODEV;
}
- table = ovsl_dereference(dp->table);
-
+ table = rcu_dereference(dp->table);
for (;;) {
struct sw_flow *flow;
u32 bucket, obj;
@@ -1468,7 +1469,7 @@ static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
cb->args[0] = bucket;
cb->args[1] = obj;
}
- ovs_unlock();
+ rcu_read_unlock();
return skb->len;
}