[ovs-dev] [PATCH 1/8] datapath: fix flow stats accounting when node 0 is not possible

[Jarno Rajahalme]

From: Thadeu Lima de Souza Cascardo <cascardo at redhat.com>

Upstream commit:

    commit 40773966ccf1985a1b2bb570a03cbeaf1cbd4e00
    Author: Thadeu Lima de Souza Cascardo <cascardo at redhat.com>
    Date:   Thu Sep 15 19:11:52 2016 -0300

    openvswitch: fix flow stats accounting when node 0 is not possible

    On a system with only node 1 as possible, all statistics is going to be
    accounted on node 0 as it will have a single writer.

    However, when getting and clearing the statistics, node 0 is not going
    to be considered, as it's not a possible node.

    Tested that statistics are not zero on a system with only node 1
    possible. Also compile-tested with CONFIG_NUMA off.

    Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo at redhat.com>
    Acked-by: Pravin B Shelar <pshelar at ovn.org>
    Signed-off-by: David S. Miller <davem at davemloft.net>

This patch contained a memory leak that is fixed in this backport.
The next patch silently fixed that in upstream, too.

Signed-off-by: Jarno Rajahalme <jarno at ovn.org>
---
 datapath/flow.c       | 6 ++++--
 datapath/flow_table.c | 3 ++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/datapath/flow.c b/datapath/flow.c
index 390286c..6d56644 100644
--- a/datapath/flow.c
+++ b/datapath/flow.c
@@ -141,7 +141,8 @@ void ovs_flow_stats_get(const struct sw_flow *flow,
 	*tcp_flags = 0;
 	memset(ovs_stats, 0, sizeof(*ovs_stats));
 
-	for_each_node(node) {
+	/* We open code this to make sure node 0 is always considered */
+	for (node = 0; node < MAX_NUMNODES; node = next_node(node, node_possible_map)) {
 		struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[node]);
 
 		if (stats) {
@@ -164,7 +165,8 @@ void ovs_flow_stats_clear(struct sw_flow *flow)
 {
 	int node;
 
-	for_each_node(node) {
+	/* We open code this to make sure node 0 is always considered */
+	for (node = 0; node < MAX_NUMNODES; node = next_node(node, node_possible_map)) {
 		struct flow_stats *stats = ovsl_dereference(flow->stats[node]);
 
 		if (stats) {
diff --git a/datapath/flow_table.c b/datapath/flow_table.c
index d4204e5..3829b92 100644
--- a/datapath/flow_table.c
+++ b/datapath/flow_table.c
@@ -154,7 +154,8 @@ static void flow_free(struct sw_flow *flow)
 		kfree(flow->id.unmasked_key);
 	if (flow->sf_acts)
 		ovs_nla_free_flow_actions((struct sw_flow_actions __force *)flow->sf_acts);
-	for_each_node(node)
+	/* We open code this to make sure node 0 is always considered */
+	for (node = 0; node < MAX_NUMNODES; node = next_node(node, node_possible_map))
 		if (flow->stats[node])
 			kmem_cache_free(flow_stats_cache,
 					rcu_dereference_raw(flow->stats[node]));
-- 
2.1.4