In ovs_vport_get_upcall_stats(), some statistics protected by
u64_stats_sync, are read and accumulated in ignorance of possible
u64_stats_fetch_retry() events. These statistics are already accumulated
by u64_stats_inc(). Fix this by reading them into temporary variables
first.
Fixes: 1933ea365aa7 ("net: openvswitch: Add support to count upcall packets")
Signed-off-by: David Yang <[email protected]>
---
net/openvswitch/vport.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
index 6bbbc16ab778..bc46d661b527 100644
--- a/net/openvswitch/vport.c
+++ b/net/openvswitch/vport.c
@@ -319,13 +319,17 @@ int ovs_vport_get_upcall_stats(struct vport *vport,
struct sk_buff *skb)
for_each_possible_cpu(i) {
const struct vport_upcall_stats_percpu *stats;
unsigned int start;
+ __u64 n_success;
+ __u64 n_fail;
stats = per_cpu_ptr(vport->upcall_stats, i);
do {
start = u64_stats_fetch_begin(&stats->syncp);
- tx_success += u64_stats_read(&stats->n_success);
- tx_fail += u64_stats_read(&stats->n_fail);
+ n_success = u64_stats_read(&stats->n_success);
+ n_fail = u64_stats_read(&stats->n_fail);
} while (u64_stats_fetch_retry(&stats->syncp, start));
+ tx_success += n_success;
+ tx_fail += n_fail;
}
nla = nla_nest_start_noflag(skb, OVS_VPORT_ATTR_UPCALL_STATS);
--
2.51.0
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