netdev - [PATCH net-next] openvswitch: Warn over-mtu packets only if iface is UP.

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Date:   Tue, 16 Mar 2021 17:14:27 -0300
From:   Flavio Leitner <fbl@...close.org>
To:     netdev@...r.kernel.org
Cc:     Eelco Chaudron <echaudro@...hat.com>,
        Pravin B Shelar <pshelar@....org>
Subject: [PATCH net-next] openvswitch: Warn over-mtu packets only if iface is UP.

It is not unusual to have the bridge port down. Sometimes
it has the old MTU, which is fine since it's not being used.

However, the kernel spams the log with a warning message
when a packet is going to be sent over such port. Fix that
by warning only if the interface is UP.

Signed-off-by: Flavio Leitner <fbl@...close.org>
---
 net/openvswitch/vport.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
index 4ed7e52c7012..88deb5b41429 100644
--- a/net/openvswitch/vport.c
+++ b/net/openvswitch/vport.c
@@ -497,10 +497,12 @@ void ovs_vport_send(struct vport *vport, struct sk_buff *skb, u8 mac_proto)
 
 	if (unlikely(packet_length(skb, vport->dev) > mtu &&
 		     !skb_is_gso(skb))) {
-		net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
-				     vport->dev->name,
-				     packet_length(skb, vport->dev), mtu);
 		vport->dev->stats.tx_errors++;
+		if (vport->dev->flags & IFF_UP)
+			net_warn_ratelimited("%s: dropped over-mtu packet: "
+					     "%d > %d\n", vport->dev->name,
+					     packet_length(skb, vport->dev),
+					     mtu);
 		goto drop;
 	}
 
-- 
2.29.2