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Subject[PATCH net-next 1/2] openvswitch: Fix double reporting of drops in dropwatch
Date
Frames sent to userspace can be reported as dropped in
ovs_dp_process_packet, however, if they are dropped in the netlink code
then netlink_attachskb will report the same frame as dropped.

This patch checks for error codes which indicate that the frame has
already been freed.

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2109946
Signed-off-by: Mike Pattrick <mkp@redhat.com>
---
net/openvswitch/datapath.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index 7e8a39a35627..029f9c3e1c28 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -252,10 +252,20 @@ void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)

upcall.mru = OVS_CB(skb)->mru;
error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
- if (unlikely(error))
- kfree_skb(skb);
- else
+ switch (error) {
+ case 0:
+ fallthrough;
+ case -EAGAIN:
+ fallthrough;
+ case -ERESTARTSYS:
+ fallthrough;
+ case -EINTR:
consume_skb(skb);
+ break;
+ default:
+ kfree_skb(skb);
+ break;
+ }
stats_counter = &stats->n_missed;
goto out;
}
--
2.31.1
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