linux-kernel - [PATCH 5.13 068/127] ovs: clear skb->tstamp in forwarding path

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Date:   Tue, 24 Aug 2021 12:55:08 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     "kaixi.fan" <fankaixi.li@...edance.com>,
        xiexiaohui <xiexiaohui.xxh@...edance.com>,
        Cong Wang <cong.wang@...edance.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.13 068/127] ovs: clear skb->tstamp in forwarding path

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

[ Upstream commit 01634047bf0d5c2d9b7d8095bb4de1663dbeedeb ]

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.

Fixes: fb420d5d91c1 ("tcp/fq: move back to CLOCK_MONOTONIC")
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>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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;
 
-- 
2.30.2