netdev - [PATCH] ovs: clear skb->tstamp in forwarding path

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Date:   Wed, 18 Aug 2021 10:22:15 +0800
From:   fankaixi.li@...edance.com
To:     dev@...nvswitch.org, netdev@...r.kernel.org
Cc:     "kaixi . fan" <fankaixi.li@...edance.com>,
        xiexiaohui <xiexiaohui.xxh@...edance.com>,
        Cong Wang <cong.wang@...edance.com>
Subject: [PATCH] ovs: clear skb->tstamp in forwarding path

From: kaixi.fan <fankaixi.li@...edance.com>

fq qdisc requires tstamp to be cleared in the forwarding path. Now ovs
doesn't clear skb->tstamp. We encountered a problem with linux
version 5.4.56 and ovs version 2.14.1, and packets failed to
dequeue from qdisc when fq qdisc was attached to ovs port.

Signed-off-by: kaixi.fan <fankaixi.li@...edance.com>
Signed-off-by: xiexiaohui <xiexiaohui.xxh@...edance.com>
Reviewed-by: Cong Wang <cong.wang@...edance.com>
---
 net/openvswitch/vport.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
index 88deb5b41429..cf2ce5812489 100644
--- a/net/openvswitch/vport.c
+++ b/net/openvswitch/vport.c
@@ -507,6 +507,7 @@ void ovs_vport_send(struct vport *vport, struct sk_buff *skb, u8 mac_proto)
 	}
 
 	skb->dev = vport->dev;
+	skb->tstamp = 0;
 	vport->ops->send(skb);
 	return;
 
-- 
2.20.1