From: Jarno Rajahalme <jrajaha...@nicira.com>
commit 86ec8dbae27e5fa2b5d54f10f77286d9ef55732a upstream
For ovs_flow_stats_get() using ovsl_dereference() was wrong, since
flow dumps call this with RCU read lock.
ovs_flow_stats_clear() is always called with ovs_mutex, so can use
ovsl_dereference().
Also, make the ovs_flow_stats_get() 'flow' argument const to make
later patches cleaner.
Signed-off-by: Jarno Rajahalme <jrajaha...@nicira.com>
Signed-off-by: Pravin B Shelar <pshe...@nicira.com>
Signed-off-by: He Zhe <zhe...@windriver.com>
---
net/openvswitch/flow.c | 10 ++++++----
net/openvswitch/flow.h | 6 +++---
2 files changed, 9 insertions(+), 7 deletions(-)
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index 1019fc1..334751c 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -122,8 +122,9 @@ unlock:
spin_unlock(&stats->lock);
}
-/* Called with ovs_mutex. */
-void ovs_flow_stats_get(struct sw_flow *flow, struct ovs_flow_stats *ovs_stats,
+/* Must be called with rcu_read_lock or ovs_mutex. */
+void ovs_flow_stats_get(const struct sw_flow *flow,
+ struct ovs_flow_stats *ovs_stats,
unsigned long *used, __be16 *tcp_flags)
{
int node;
@@ -133,7 +134,7 @@ 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 = ovsl_dereference(flow->stats[node]);
+ struct flow_stats *stats =
rcu_dereference_ovsl(flow->stats[node]);
if (stats) {
/* Local CPU may write on non-local stats, so we must
@@ -150,12 +151,13 @@ void ovs_flow_stats_get(struct sw_flow *flow, struct
ovs_flow_stats *ovs_stats,
}
}
+/* Called with ovs_mutex. */
void ovs_flow_stats_clear(struct sw_flow *flow)
{
int node;
for_each_node(node) {
- struct flow_stats *stats = rcu_dereference(flow->stats[node]);
+ struct flow_stats *stats = ovsl_dereference(flow->stats[node]);
if (stats) {
spin_lock_bh(&stats->lock);
diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
index a292bf8..ac395d2 100644
--- a/net/openvswitch/flow.h
+++ b/net/openvswitch/flow.h
@@ -180,10 +180,10 @@ struct arp_eth_header {
unsigned char ar_tip[4]; /* target IP address */
} __packed;
-void ovs_flow_stats_update(struct sw_flow *flow, struct sk_buff *skb);
-void ovs_flow_stats_get(struct sw_flow *flow, struct ovs_flow_stats *stats,
+void ovs_flow_stats_update(struct sw_flow *, struct sk_buff *);
+void ovs_flow_stats_get(const struct sw_flow *, struct ovs_flow_stats *,
unsigned long *used, __be16 *tcp_flags);
-void ovs_flow_stats_clear(struct sw_flow *flow);
+void ovs_flow_stats_clear(struct sw_flow *);
u64 ovs_flow_used_time(unsigned long flow_jiffies);
int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *);
--
1.9.1
--
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