[PATCH 5.4 262/367] veth: Fixing transmit return status for dropped packets

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5.4-stable review patch.  If anyone has any objections, please let me know.


From: Liang Chen <liangchen.linux@xxxxxxxxx>

[ Upstream commit 151e887d8ff97e2e42110ffa1fb1e6a2128fb364 ]

The veth_xmit function returns NETDEV_TX_OK even when packets are dropped.
This behavior leads to incorrect calculations of statistics counts, as
well as things like txq->trans_start updates.

Fixes: e314dbdc1c0d ("[NET]: Virtual ethernet device driver.")
Signed-off-by: Liang Chen <liangchen.linux@xxxxxxxxx>
Reviewed-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
 drivers/net/veth.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index a6445bba4f942..cae7247a397aa 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -238,6 +238,7 @@ static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
 	struct veth_priv *rcv_priv, *priv = netdev_priv(dev);
 	struct veth_rq *rq = NULL;
+	int ret = NETDEV_TX_OK;
 	struct net_device *rcv;
 	int length = skb->len;
 	bool rcv_xdp = false;
@@ -270,6 +271,7 @@ static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
 	} else {
+		ret = NET_XMIT_DROP;
 	if (rcv_xdp)
@@ -277,7 +279,7 @@ static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
-	return NETDEV_TX_OK;
+	return ret;
 static u64 veth_stats_tx(struct pcpu_lstats *result, struct net_device *dev)

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