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authorJarno Rajahalme <jrajahalme@nicira.com>2014-05-05 11:32:17 -0700
committerPravin B Shelar <pshelar@nicira.com>2014-05-22 16:27:34 -0700
commitbb6f9a708d4067713afae2e9eb2637f6b4c01ecb (patch)
tree2df408598e97bcb98c9204c62addb5b187a48153
parentbe52c9e96a6657d117bb0ec6e11438fb246af5c7 (diff)
openvswitch: Clarify locking.
Remove unnecessary locking from functions that are always called with appropriate locking. Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com> Signed-off-by: Thomas Graf <tgraf@redhat.com> Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
-rw-r--r--net/openvswitch/datapath.c13
-rw-r--r--net/openvswitch/flow.c3
2 files changed, 9 insertions, 7 deletions
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index 90a1e5e66287..138ea0c9e1b3 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -173,6 +173,7 @@ static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
}
+/* Called with ovs_mutex or RCU read lock. */
struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
{
struct vport *vport;
@@ -652,7 +653,7 @@ static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
+ nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
}
-/* Called with ovs_mutex. */
+/* Called with ovs_mutex or RCU read lock. */
static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
struct sk_buff *skb, u32 portid,
u32 seq, u32 flags, u8 cmd)
@@ -743,6 +744,7 @@ error:
return err;
}
+/* Must be called with ovs_mutex. */
static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow,
struct genl_info *info)
{
@@ -753,6 +755,7 @@ static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow,
return genlmsg_new_unicast(len, info, GFP_KERNEL);
}
+/* Must be called with ovs_mutex. */
static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
struct datapath *dp,
struct genl_info *info,
@@ -1094,6 +1097,7 @@ static size_t ovs_dp_cmd_msg_size(void)
return msgsize;
}
+/* Called with ovs_mutex or RCU read lock. */
static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
u32 portid, u32 seq, u32 flags, u8 cmd)
{
@@ -1109,9 +1113,7 @@ static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
ovs_header->dp_ifindex = get_dpifindex(dp);
- rcu_read_lock();
err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
- rcu_read_unlock();
if (err)
goto nla_put_failure;
@@ -1136,6 +1138,7 @@ error:
return -EMSGSIZE;
}
+/* Must be called with ovs_mutex. */
static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp,
struct genl_info *info, u8 cmd)
{
@@ -1154,7 +1157,7 @@ static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp,
return skb;
}
-/* Called with ovs_mutex. */
+/* Called with rcu_read_lock or ovs_mutex. */
static struct datapath *lookup_datapath(struct net *net,
struct ovs_header *ovs_header,
struct nlattr *a[OVS_DP_ATTR_MAX + 1])
@@ -1166,10 +1169,8 @@ static struct datapath *lookup_datapath(struct net *net,
else {
struct vport *vport;
- rcu_read_lock();
vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
- rcu_read_unlock();
}
return dp ? dp : ERR_PTR(-ENODEV);
}
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index 6d8d2da0a8ec..1019fc1db06e 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -122,6 +122,7 @@ unlock:
spin_unlock(&stats->lock);
}
+/* Called with ovs_mutex. */
void ovs_flow_stats_get(struct sw_flow *flow, struct ovs_flow_stats *ovs_stats,
unsigned long *used, __be16 *tcp_flags)
{
@@ -132,7 +133,7 @@ void ovs_flow_stats_get(struct sw_flow *flow, struct ovs_flow_stats *ovs_stats,
memset(ovs_stats, 0, sizeof(*ovs_stats));
for_each_node(node) {
- struct flow_stats *stats = rcu_dereference(flow->stats[node]);
+ struct flow_stats *stats = ovsl_dereference(flow->stats[node]);
if (stats) {
/* Local CPU may write on non-local stats, so we must