diff options
| author | David Yang <mmyangfl@gmail.com> | 2026-01-21 15:29:26 +0800 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2026-01-22 12:55:22 +0100 |
| commit | cc4816bdb08639e5cd9acb295a02d6f0f09736b4 (patch) | |
| tree | 2a02c7ddb63f8bba0d0e9da15cafa6d588521451 | |
| parent | 19e4175e997a5b85eab97d522f00cc99abd1873c (diff) | |
net: openvswitch: fix data race in ovs_vport_get_upcall_stats
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 <mmyangfl@gmail.com>
Acked-by: Ilya Maximets <i.maximets@ovn.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Aaron Conole <aconole@redhat.com>
Link: https://patch.msgid.link/20260121072932.2360971-1-mmyangfl@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
| -rw-r--r-- | net/openvswitch/vport.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c index 6bbbc16ab778..f0ce8ce1dce0 100644 --- a/net/openvswitch/vport.c +++ b/net/openvswitch/vport.c @@ -310,22 +310,23 @@ void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats) */ int ovs_vport_get_upcall_stats(struct vport *vport, struct sk_buff *skb) { + u64 tx_success = 0, tx_fail = 0; struct nlattr *nla; int i; - __u64 tx_success = 0; - __u64 tx_fail = 0; - for_each_possible_cpu(i) { const struct vport_upcall_stats_percpu *stats; + u64 n_success, n_fail; unsigned int start; 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); |