netdev - [net-next PATCH 3/3] veth: don't assign a qdisc to veth

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Date:	Wed, 29 Jul 2015 22:51:43 +0200
From:	Phil Sutter <phil@....cc>
To:	netdev@...r.kernel.org
Cc:	Jesper Dangaard Brouer <brouer@...hat.com>,
	Cong Wang <cwang@...pensource.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>
Subject: [net-next PATCH 3/3] veth: don't assign a qdisc to veth

From: Jesper Dangaard Brouer <brouer@...hat.com>

The veth driver is a virtual device, and should not have assigned
the default qdisc.  Verified (ndo_start_xmit) veth_xmit can only
return NETDEV_TX_OK, thus this should be safe to bypass qdisc.

Not assigning a qdisc is subtly done by setting tx_queue_len to zero.

Reported-by: Mrunal Patel <mpatel@...hat.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
Signed-off-by: Phil Sutter <phil@....cc>
---
 drivers/net/veth.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index c8186ff..6b3d822 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -302,6 +302,7 @@ static const struct net_device_ops veth_netdev_ops = {
 static void veth_setup(struct net_device *dev)
 {
 	ether_setup(dev);
+	dev->tx_queue_len = 0;
 
 	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
-- 
2.1.2

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